diff --git a/contrib/less/NEWS b/contrib/less/NEWS index 468f59441b28..b1f8771c6c31 100644 --- a/contrib/less/NEWS +++ b/contrib/less/NEWS @@ -1,1243 +1,1281 @@ NEWS about less ====================================================================== For the latest news about less, see https://greenwoodsoftware.com/less You can also download the latest version of less from there. Report bugs, suggestions or comments at https://github.com/gwsw/less/issues. +====================================================================== + + Major changes between "less" versions 633 and 643 + +* Fix problem when a program piping into less reads from the tty, + like sudo asking for password (github #368). + +* Fix search modifier ^E after ^W. + +* Fix bug using negated (^N) search (github #374). + +* Fix bug setting colors with -D on Windows build (github #386). + +* Fix reading special chars like PageDown on Windows (github #378). + +* Fix mouse wheel scrolling on Windows (github #379). + +* Fix erroneous EOF when terminal window size changes (github #372). + +* Fix compile error with some definitions of ECHONL (github #395). + +* Fix crash on Windows when writing logfile (github #405). + +* Fix regression in exit code when stdin is /dev/null and + output is a file (github #373). + +* Add lesstest test suite to production release (github #344). + +* Change lesstest output to conform with + automake Simple Test Format (github #399). + +====================================================================== + + Major changes between "less" versions 632 and 633 + +* Fix build on systems which have ncurses/termcap.h or + ncursesw/termcap.h but not termcap.h. + ====================================================================== Major changes between "less" versions 608 and 632 * Add LESSUTFCHARDEF environment variable (github #275). * Add # command (github #330). * Add ^S search modifier (github #196). * Add --wordwrap option (github #113). * Add --no-vbell option (github #304). * Add --no-search-headers option (github #44). * Add --modelines option (github #89). * Add --intr option (github #224). * Add --proc-backspace, --proc-tab and --proc-return options (github #335). * Add --show-preproc-errors option (github #258). * Add LESS_LINES and LESS_COLUMNS environment variables (github #84). * Add LESS_DATA_DELAY environment variable (github #337). * Allow empty "lines" field in --header option. * Update Unicode tables. * Improve ability of ^X to interrupt F command (github #49). * Status column (-J) shows off-screen matches. * Parenthesized sub-patterns in searches are colored with unique colors, if supported by the regular expression library (github #196). * Don't allow opening a tty as file input unless -f is set (github #309). * Don't require newline input after +&... option (github #339). * Fix incorrect handling of some Private Use Unicode characters. * Fix ANSI color bug when overstriking with colored chars (github #276). * Fix compiler const warning (github #279). * Fix signal race in iread (github #280). * Fix reading procfs files on Linux (github #282). * Fix --ignore-case with ctrl-R (no regex) search (github #300). * Fix bug doing repeat search after setting & filter (github #299). * Fix bug doing repeat search before non-repeat search. * Fix crash with -R and certain line lengths (github #338). * Fix input of Windows dead keys (github #352). * Don't retain search options from a cancelled search (github #302). * Don't call realpath on fake filenames like "-" (github #289). * Implement lesstest test suite. * Convert function parameter definitions from K&R to C89 (github #316). ====================================================================== Major changes between "less" versions 590 and 608 * Add the --header option (github #43). * Add the --no-number-headers option (github #178). * Add the --status-line option. * Add the --redraw-on-quit option (github #36). * Add the --search-options option (github #213). * Add the --exit-follow-on-close option (github #244). * Add 'H' color type to set color of header lines. * Add #version conditional to lesskey. * Add += syntax to variable section in lesskey files. * Allow option name in -- command to end with '=' in addition to '\n'. * Add $HOME/.config to possible locations of lesskey file (github #153). * Add $XDG_STATE_HOME and $HOME/.local/state to possible locations of history file (github #223). * Don't read or write history file in secure mode (github #201). * Fix display of multibyte and double-width chars in prompt. * Fix ESC-BACKSPACE command when BACKSPACE key does not send 0x08 (github #188). * Add more \k codes to lesskey format. * Fix bug when empty file is modified while viewing it. * Fix bug when parsing a malformed lesskey file (githb #234). * Fix bug scrolling history when --incsearch is set (github #214). * Fix buffer overflow when invoking lessecho with more than 63 -m/-n options (github #198). * Fix buffer overflow in bin_file (github #271). * Fix bug restoring color at end of highlighted text. * Fix bug in parsing lesskey file. * Defer moving cursor to lower left in some more cases. * Suppress TAB filename expansion in some cases where it doesn't make sense. * Fix termlib detection when compiler doesn't accept calls to undeclared functions. * Fix bug in input of non-ASCII characters on Windows (github #247) * Escape filenames when invoking LESSCLOSE. * Fix bug using multibyte UTF-8 char in search string with --incsearch (github #273). ====================================================================== Major changes between "less" versions 581 and 590 * Make less able to read lesskey source files (deprecating lesskey). * If XDG_CONFIG_HOME is set, find lesskey source file in $XDG_CONFIG_HOME/lesskey rather than $HOME/.lesskey. * If XDG_DATA_HOME is set, find and store history file in $XDG_DATA_HOME/lesshst rather than $HOME/.lesshst. * Add the --lesskey-src option. * Add the --file-size option. * With -F, if screen is resized to make file fit on one screen, don't exit. * Fix bug which could leave terminal in mouse-reporting mode after exiting less. * Fix bug which caused failure to respond to window resize. * Fix backslash bug searching in tag file. ====================================================================== Major changes between "less" versions 563 and 581 * Change ESC-u command to toggle, not disable, highlighting per man page. * Add ESC-U command. * Add ctrl-W search modifier for wrapping search. * F command can be interrupted by ^X. * Support OSC 8 hyperlinks when -R is in effect. * g command with no number will ignore -j and put first line at top of screen. * Multiple + or -p command line options are handled better. * Add the --incsearch option. * Add the --line-num-width option. * Add the --status-col-width option. * Add the --use-color and --color options. * Display -w highlight even if highlighted line is empty. * If search result is in a long line, scroll to ensure it is visible. * Editing the same file under different names now creates only one entry in the file list. * Make visual bell more visible on some terminals. * Ring end-of-file bell no more than once per second. * Build can use either Python or Perl for Makefile.aut operations. * Fix crash when using the @ search modifier. * Fix crash in the 's' command due to duplicate free. * Fix realpath crash on Darwin. ====================================================================== Major changes between "less" versions 551 and 563 * Update Unicode tables. * Treat Hangul Jamo medial vowels and final consonants as zero width. * Display error message immediately when -o is toggled and input is not a pipe. * Fix regression: make screen repaint when "squished" and a no-movement command is given. * Fix erroneous EOF calculation when F command is interrupted. * Make WIN32C version include this fix from 551: Don't count lines in initial screen if using -X with -F. * Fix display bug in WIN32C version. * Fix memory corruption when built with libtermcap. * Support libtinfow. ====================================================================== Major changes between "less" versions 530 and 551 * Add --mouse option. * Add --wheel-lines option. * Add --no-histdups option. * Add --save-marks option. * Support PCRE2 regular expression library. * Redraw screen on SIGWINCH even if screen size doesn't change. * Shell-escape filenames in history so they can be used again. * Ring bell if user enters invalid long option name. * Use PCRE_UTF8 flag for pcre regular expressions when in UTF-8 mode. * Windows: use wide-char string to set console title. * Don't count lines in initial screen if using -X with -F. * Support mingw build system. * Fix bug in v command on empty file. * Fix bug in v command when filename contains shell metacharacters. ====================================================================== Major changes between "less" versions 487 and 530 * Don't output terminal init sequence if using -F and file fits on one screen. * When using -S, mark truncated lines with a special character. The character can be changed or disabled via the new --rscroll option. * New command M marks the last line displayed on the screen. * New command ESC-m removes a line mark. * Status column (enabled via -J) now shows mark letters. * Status column shows search matches even if highlighting is disabled via -G. * A second ESC-u command will clear search match markers in the status column. * Do same ANSI escape code filtering for tag matching that we do for searching, to help when viewing syntax-highlighted code. * Catch SIGTERM and clean up before exiting. * Fix bug initializing default charset on Windows. * Handle keypad ENTER key correctly if it sends something other than newline. * Fix buffering bug when using stdin with a LESSOPEN pipe. * On Windows, allow 'u' in -D option to enable underlining. * On Windows, use underline in sgr mode. * On Windows, convert UTF-8 to multibyte if console is not UTF-8. * Update Unicode tables to 2017-03-08. * Pass-thru Unicode formatting chars (Cf type) instead of treating them as binary chars. But treat them as binary if -U is set. * Fix erroneous binary file warning when UTF-8 file contains ANSI SGR sequences. * Fix bugs when using LESSOPEN and switching between stdin and other files. * Fix some bugs handling filenames containing shell metacharacters. * Fix some memory leaks. * Allow some debugging environment variables to be set in lesskey file. * Code improvements: . Use ANSI prototypes in funcs.h declarations. . Fix some const mismatches. . Remove archaic "register" in variable declarations. ====================================================================== Major changes between "less" versions 481 and 487 * New commands ESC-{ and ESC-} to shift to start/end of displayed lines. * Make search highlights work correctly when changing caselessness with -i. * New option -Da in Windows version to enable SGR mode. * Fix "nothing to search" error when top or bottom line on screen is empty. * Fix bug when terminal has no "cm" termcap entry. * Fix incorrect display when entering double-width chars in search string. * Fix bug in Unicode handling that missed some double width characters. * Update Unicode database to 9.0.0. ====================================================================== Major changes between "less" versions 458 and 481 * Don't overwrite history file; just append to it. * New command ESC-G goes to end of currently buffered data in a pipe. * Disable history feature when compiled with LESSHISTFILE set to "-". * In more-compatible mode, make the -p option apply to every file opened, not just the first one. * In more-compatible mode, change the -e option to work like -E, not -EF. * Treat multiple CRs before LF are like one CR (all the CRs are hidden). * Allow "extra" string in lesskey file to append to a multi-char command (like a search pattern), without executing the command. * Ignore -u/-U setting while viewing help file, so that underline and bold chars are displayed correctly. * Improve detection of "binary" files in UTF-8 mode. * Fix bug with ++ commands. * Fix bug where prompt was sometimes not displayed with +G. * Fix possible memory corruption * Fix bugs and improve performance in ampersand filtering. * Automate construction of Unicode tables from Unicode database. * Allow %% escape sequence in LESSOPEN variable. ====================================================================== Major changes between "less" versions 451 and 458 * Allow backslash escaping of metacharacters in LESS environment variable after the --use-backslash option. * Don't quit if syntax errors are found in command line options. * Increase sizes of some internal buffers. * Fix configure bug with --with-regex=none. * Fix crash with "stty rows 0". * Fix Win32 attribute display bug. * Fix display bug when using up/down arrow on the command line. ====================================================================== Major changes between "less" versions 444 and 451 * Add ESC-F command to keep reading data until a pattern is found. * Use exit code of LESSOPEN script if LESSOPEN starts with "||". * When up/down arrow is used on the command line immediately after typing text, the next command starting with that text is found. * Add support for GNU regex. * Add configure option --with-regex=none and fix compile errors when compiling with no regex library. * Fix bugs handling SGR sequences in Win32. * Fix possible crashes caused by malformed LESSOPEN or LESSCLOSE variables. * Fix bug highlighting text which is discontiguous in the file due to backspace processing. * Fix bug in displaying status column when scrolling backwards with -J and -S in effect. ====================================================================== Major changes between "less" versions 443 and 444 * Fix bug in unget handling that can cause strange effects on the command line. * Remove vestiges of obsolete -l option that can cause a crash. ====================================================================== Major changes between "less" versions 436 and 443 * Change search behavior such that when a search is given an explicit pattern, the entire displayed screen is included in the search and not just the portion after the target line. * Add -A option to change search behavior to the old way: only the portion of the screen after the target line is searched. * Add %F formatting to prompt strings, replaced by the last component of the input file. * Control-G while editing a command exits the command. * Less now exits with status 2 if control-C is pressed and -K is in effect. * Fix "ungetc overflow" when passing long commands via the -p option. * Fix bug in using line filtering via the & command in combination with -i and -I. * Fix bug in handling negative arguments to the -j option. * Fix bug in handling %t in prompt strings. * Improve handling of long option names. * Improve percentage calculation for very large files. ====================================================================== Major changes between "less" versions 429 and 436 * Don't pass "-" to non-pipe LESSOPEN unless it starts with "-". * Allow a fraction as the argument to the -# (--shift) option. * Fix highlight bug when underlined/overstruck text matches at end of line. * Fix non-regex searches with ctrl-R. ====================================================================== Major changes between "less" versions 424 and 429 * LESSOPEN pipe will now be used on standard input, if the LESSOPEN environment variable begins with "|-". * The -D option with one number now means use the normal background color. * Don't change permissions on history file if it is not a regular file. * Fix non-ANSI-compliant code that caused problems with some compilers. * Fix binary file detection in UTF-8 mode. * Fix display problems with long lines on "ignaw" terminals. * Fix problem interrupting the line number calculation for initial prompt. * Fix SGR emulation when dealing with multiple attributes (e.g. bold+underline). * Fix highlight bug when searching for underlined/overstruck text. ====================================================================== Major changes between "less" versions 418 and 424 * New "&" command allows filtering of lines based on a pattern. * Status column now displays a search match, even if the matched string is scrolled off screen because -S is in effect. * Improve behavior of -F option. * Allow CSI character (0x9B) to work in UTF-8 mode. * Output carriage return at startup in case terminal doesn't default to column 1. * Fix bug in '' (quote, quote) command after G command. ====================================================================== Major changes between "less" versions 416 and 418 * Color escape sequences are now supported in WIN32 build. * Makefile now uses EXEEXT feature of autoconf. * Fix search bug when using -R and text contains ANSI color escape sequences. * Fix crash when using -r with UTF-8 text containing 0x9B bytes. * Fix display bug when using ' command to move less than one page forward. * Update GPL to version 3. ====================================================================== Major changes between "less" versions 409 and 416 * New --follow-name option makes F command follow the name of a file rather than the file descriptor if an open file is renamed. * Make searching with -i/-I work correctly with non-ASCII text. * Fix DJGPP build. ====================================================================== Major changes between "less" versions 406 and 409 * Support CSI escape sequences, like SGR escape sequences. * Fix bug which caused screen to fail to repaint when window is resized. * Fix bug in using -i and -I flags with non-ASCII text. * Fix configure bug on systems which don't support langinfo.h. * Fix crash when searching text containing certain invalid UTF-8 sequences. ====================================================================== Major changes between "less" versions 394 and 406 * Allow decimal point in number for % (percent) command. * Allow decimal point in number for -j option (fraction of screen height). * Make n command fetch previous pattern from history file on first search. * Don't rewrite history file if it has not changed. * Don't move to bottom of screen on first page. * Don't output extraneous newlines, so copy & pasting lines from the output works better. * The -c option has been made identical with the -C option. * Allow "/dev/null" as synonym for "-" in LESSHISTFILE to indicate that no history file should be used. * Search can now find text which follows a null byte, if the PCRE library is used, or if no-regex searching (ctrl-R) is used. * Better compatibility with POSIX more specification. * Make -f work for directories. * Make "t" cmd traverse tags in the correct order. * Allow a few binary characters in the input file before warning that the file is binary. * Don't warn that file is binary if it merely contains ANSI color sequences and -R is in effect. * Update Unicode character tables. * Support DESTDIR in Makefile. * Fix bug when filename contains certain shell metacharacters such as "$". * Fix bug when resizing the window while waiting for input from a pipe. * Fix configure bugs. ====================================================================== Major changes between "less" versions 382 and 394 * Add history file to save search and shell command history between invocations of less. * Improve behavior of history list for search and shell commands. * Add -K (or --quit-on-intr) option to make less exit immediately on ctrl-C. * Improve handling of UTF-8 files and commands, including better line wrapping and handling double-width chars. * Added LESSUTFBINFMT environment variable to control display of non-printable characters in a UTF-8 file. * Add --with-secure option to configure, to make it easier to build a secure version of less. * Show search matches in the status column even if search highlights are disabled via the -G option or the ESC-u command. * Improve performance when the file contains very long lines. * Add "windows" charset. * Add man page for lessecho. * Add support for erase2 character, treated same as erase. * Use ASCII lowercase/uppercase logic when operating on the command line. * Update makefile for Borland C++ 5.5.1. * Fix bug in calculating number of pages for %D prompt. * Fix bug in handling tag file error. * Fix obscure bug if input file is deleted while viewing help. * Fix bug handling filenames which include square brackets. * Fix possible buffer overflow in "global" tag search. * Fix possible buffer overflow in usage of LESSOPEN and LESSCLOSE. * Fix buffer overflow in reverse search. ====================================================================== Major changes between "less" versions 381 and 382 * Removed some old copyrighted code. This probably breaks OS/9 support. ====================================================================== Major changes between "less" versions 378 and 381 * New -L option to disable LESSOPEN processing. * Further support for large (64 bit) file addressing. Large file support is now set up by the configure script. * Use autoconf 2.54. Replace configure.in, acconfig.h, defines.h.top with configure.ac. * Overstriking underscore with underscore is now bold or underlined depending on context. * Use only 7 spaces for line numbers in -N mode, if possible. * Fix some bugs in handling overstriking in UTF-8 files. * Fix some nroff issues in the man page. ====================================================================== Major changes between "less" versions 376 and 378 * Bug fixes: Default buffer space is now 64K as documented. Search highlighting works properly when used with -R. Windows version works properly when input file contains carriage returns. Clean up some compiler warnings. ====================================================================== Major changes between "less" versions 358 and 376 * -x option can now specify multiple variable-width tab stops. * -X option no longer disables keypad initialization. New option --no-keypad disables keypad initialization. * New commands t and T step through multiple tag matches. Added support for "global(1)" tags (see http://www.gnu.org/software/global/global.html). * New prompt style set by option -Pw defines the message printed while waiting for data in the F command. * System-wide lesskey file now defaults to sysless in etc directory instead of .sysless in bin directory. Use "configure --sysconfdir=..." to change it. (For backwards compatibility, .sysless in bin is still recognized.) * Pressing RightArrow or LeftArrow while entering a number now shifts the display N columns rather than editing the number itself. * Status column (enabled with -J) now shows search results. * Windows version sets window title. * Default LESSCHARSET for MS-DOS versions is now "dos". * Searching works better with ANSI (SGR) escape sequences. ANSI color escape sequences are now supported in the MS-DOS (DJGPP) version. * Improved performance in reading very large pipes. * Eliminated some dependencies on file offsets being 32 bits. * Fixed problems when viewing files with very long lines. * Fixed overstriking in UTF-8 mode, and overstriking tabs. * Improved horizontal shifting of text using -R option with ANSI color. * Improved handling of filenames containing shell metacharacters. * Some fixes for EBCDIC systems. * Some fixes for OS/2 systems. ====================================================================== Major changes between "less" versions 354 and 358 * Add -J (--status-column) option to display a status column. * Add -# (--shift) option to set default horizontal shift distance. Default horizontal shift distance is now one-half screen width. * Horizontal shifting does not shift line numbers if -N is in effect. * Horizontal shifting acts as though -S were set, to avoid confusion. ====================================================================== Major changes between "less" versions 352 and 354 * Allow space after numeric-valued command line options. * Fix problem with configuring terminal libraries on some systems. * Add support for PCRE regular expression library. * Add --with-regex option to configure to allow manually selecting a regular expression library. * Fix bug compiling with SECURE = 1. ====================================================================== Major changes between "less" versions 346 and 352 * Enable UTF-8 if "UTF-8" appears in locale-related environment variables. * Add --with-editor option to configure script. * The -M prompt and = message now show the top and bottom line number. * Fix bug in running the editor on a file whose name contains quotes, etc. * Fix bug in horizontal scrolling of long lines. * Fix bug in doing :d on a file which contains marks. * Fix bug causing cleared lines to sometimes be filled with standout, bold, underline, etc. on certain terminals. * Fixes for MS-DOS (DJGPP) version. ====================================================================== Major changes between "less" versions 340 and 346 * The UTF-8 character set is now supported. * The default character set is now latin1 rather than ascii. * New option -R (--RAW-CONTROL-CHARS) is like -r but handles long (wrapped) lines correctly, as long as the input contains only normal text and ANSI color escape sequences. * New option -F (--quit-if-one-screen) quits if the text fits on the first screen. * The -w option now highlights the target line of a g or p command. * A system-wide lesskey file is supported (LESSKEY_SYSTEM). * New escape for prompt strings: %c is replaced by column number. * New escape for prompt strings: %P is replaced by percentage into file, based on line number rather than byte offset. * HOME and END keys now jump to beginning of file or end of file. ====================================================================== Major changes between "less" versions 337 and 340 * Command line options for less may now be given in either the old single-letter form, or a new long name form (--option-name). See the less man page or "less --help" for the list of long option names. * Command line options for lesskey may now be given in a new long name form. See the lesskey man page for the list of long option names. * New command -- toggles an option using the long option name. * New command __ queries an option using the long option name. * The old -- command is renamed as -!. * If a ^P is entered between the dash and the option letter of the - command, the message describing the new setting is suppressed. * Lesskey files may now contain \k escape sequences to represent the "special" keys (arrows, PAGE-UP/PAGE-DOWN, HOME, END, INSERT, DELETE). * New command :d removes the current file from the list of files. * New option -~ (like -w before version 335) suppresses tildes after end-of-file. * Less is now released under the GNU General Public License. ====================================================================== Major changes between "less" versions 335 and 337 * Fixed bugs in "make install". ====================================================================== Major changes between "less" versions 332 and 335 * The old -w flag (suppress tildes after end-of-file) has been removed. * New -w flag highlights the first new line after a forward-screen. * New -W flag highlights the first new line after any forward movement. * Window resize works even if LINES and/or COLUMNS environment variables are incorrect. * New percent escapes for prompt strings: %d is replaced by the page number, and %D is replaced by the number of pages in the file. * Added charsets "iso8859" and "ebcdic". * In Windows version, uses HOMEDRIVE and HOMEPATH if HOME is not defined. * Fixed some bugs causing incorrect display on DOS/Windows. ====================================================================== Major changes between "less" versions 330 and 332 * Filenames from the command line are entered into the command history, so UPARROW/DOWNARROW can be used to retrieve them from the :e command. * Now works correctly on Windows when using a scrolling terminal window (buffer larger than display window). * On Windows, now restores the console screen on exit. Use -X to get the old behavior. * Fixed bug on Windows when CAPS-LOCK or NUM-LOCK is pressed. * Fixed bug on Windows when piping output of an interactive program. * Fixed bug in tags file processing when tags file has DOS-style line terminators (CR/LF). * Fixed compilation problem on OS/2. ====================================================================== Major changes between "less" versions 321 and 330 * Now supports filenames containing spaces (in double quotes). New option -" can be used to change the quoting characters. * In filename completion, a slash is appended to a directory name. If the environment variable LESSSEPARATOR is set, the value of that variable, rather than a slash, is appended. * LeftArrow and RightArrow are same as ESC-[ and ESC-]. * Added commands ESC-( and ESC-), same as ESC-[ and ESC-]. * A "quit" command defined in a lesskey file may now have an "extra" string, which is used to return an exit code from less when it quits. * New environment variables LESSMETACHARS and LESSMETAESCAPE provide more control over how less interfaces to the shell. * Ported to Microsoft Visual C compiler for Windows. * Ported to DJGPP compiler for MS-DOS. * Bug fixes. ====================================================================== Major changes between "less" versions 291 and 321 * Command line at bottom of screen now scrolls, so it can be longer than the screen width. * New commands ESC-] and ESC-[ scroll the display horizontally. * New command ESC-SPACE scrolls forward a full screen, even if it hits end-of-file. * Alternate modifiers for search commands: ^N is same as !, ^F is same as @, and ^E is same as *. * New modifier for search commands: ^K means highlight the matches currently on-screen, but don't move to the first match. * New modifier for search commands: ^R means don't use regular expressions in the search. * Environment variable LESSKEY gives name of default lesskey file. * Environment variable LESSSECURE will force less to run in "secure" mode. * Command line argument "--" signals that the rest of the arguments are files (not option flags). * Help file (less.hlp) is no longer installed. Help text is now embedded in the less executable itself. * Added -Ph to change the prompt for the help text. Added -Ps to change the default short prompt (same as plain -P). * Ported to the Borland C compiler for MS-DOS. * Ported to Windows 95 & Windows NT. * Ported to OS-9. * Ported to GNU Hurd. ====================================================================== Major changes between "less" versions 290 and 291 * Less environment variables can be specified in lesskey files. * Fixed MS-DOS build. ====================================================================== Major changes between "less" versions 278 and 290 * Accepts GNU-style options "--help" and "--version". * OS/2 version looks for less.ini in $HOME before $INIT and $PATH. * Bug fixes ====================================================================== Major changes between "less" versions 252 and 278 * A LESSOPEN preprocessor may now pipe the converted file data to less, rather than writing it to a temporary file. * Search pattern highlighting has been fixed. It now highlights reliably, even if a string is split across two screen lines, contains TABs, etc. * The -F flag (which suppress search highlighting) has been changed to -G. A new flag, -g, changes search highlighting to highlight only the string found by the last search command, instead of all strings which match the last search command. * New flag -I acts like -i, but ignores case even if the search pattern contains uppercase letters. * Less now checks for the environment variable VISUAL before EDITOR. * Ported to OS/2. ====================================================================== Major changes between "less" versions 237 and 252 * Changes in line-editing keys: The literal key is now ^V or ^A rather than \ (backslash). Filename completion commands (TAB and ^L) are disabled when typing a search pattern. * Line-editing command keys can be redefined using lesskey. * Lesskey with no input file defaults to $HOME/.lesskey rather than standard input. * New option -V displays version number of less. * New option -V displays version number of lesskey. * Help file less.hlp is now installed by default in /usr/local/share rather than /usr/local/lib. ====================================================================== Major changes between "less" versions 170 and 237 * By popular demand, text which matches the current search pattern is highlighted. New -F flag disables this feature. * Henry Spencer's regexp.c is now included, for systems which do not have a regular expression library. regexp.c is Copyright (c) 1986 by University of Toronto. * New line-editing keys, including command history (arrow keys) and filename completion (TAB). * Input preprocessor allows modification of input files (e.g. uncompress) via LESSOPEN/LESSCLOSE environment variables. * New -X flag disables sending termcap "ti" and "te" (initialize and deinitialize) strings to the terminal. * Changing -i from within less now correctly affects a subsequent repeated search. * Searching for underlined or overstruck text now works when the -u flag is in effect, rather than the -i flag. * Use setlocale (LANG and LC_CTYPE environment variables) to determine the character set if LESSCHARSET/LESSCHARDEF are not set. * The default format for displaying binary characters is now standout (reverse video) rather than blinking. This can still be changed by setting the LESSBINFMT environment variable. * Use autoconf installation technology. * Ported to MS-DOS. ******************************** Things that may surprise you ******************************** * When you enter text at the bottom of the screen (search string, filename, etc.), some keys act different than previously. Specifically, \ (backslash), ESC, TAB, BACKTAB, and control-L now have line editing functions. * Some previous unofficial versions of less were able to display compressed files. The new LESSOPEN/LESSCLOSE feature now provides this functionality in a different way. * Some previous unofficial versions of less provided a -Z flag to set the number of lines of text to retain between full screen scrolls. The -z-n flag (that is, -z with a negative number) provides this functionality. ====================================================================== Major changes between "less" versions 123 and 170 * New option -j allows target lines to be positioned anywhere on screen. * New option -S truncates displayed line at the screen width, rather than wrapping onto the next line. * New option -y limits amount of forward scroll. * New option -T specifies a "tags" file. * Non-printable, non-control characters are displayed in octal. Such characters, as well as control characters, are displayed in blinking mode. * New command -+ sets an option to its default. * New command -- sets an option to the opposite of its default. * Lesskey file may have a string appended to a key's action, which acts as though typed in after the command. * New commands ESC-^F and ESC-^B match arbitrary types of brackets. * New command F monitors a growing file (like "tail -f"). * New command | pipes a section of the input file into a shell command. * New command :x directly jumps to a file in the command line list. * Search commands have been enhanced and reorganized: n Repeat search, same direction. N Repeat search, opposite direction. ESC-/ Search forward thru file boundaries ESC-? Search backward thru file boundaries ESC-n Repeat search thru file boundaries, same direction. ESC-N Repeat search thru file boundaries, opposite direction. Special character * causes search to search thru file boundaries. Special character @ causes search to begin at start/end of file list. * Examining a new file adds it to the command line list. A list of files, or an expression which matches more than one file, may be examined; all of them are added to the command line list. * Environment variables LESSCHARSET and LESSCHARDEF can define a non-ASCII character set. * Partial support for MSDOS, including options -R for repainting screen on quit, -v/-V to select video mode, and -W to change window size. ====================================================================== Major changes between "less" versions 97 and 123 * New option (-N) causes line numbers to be displayed in the text of the file (like vi "set nu"). * New option (-?) prints help message immediately. * New option (-r) displays "raw" control characters, without mapping them to ^X notation. * New option (-f) forces less to open non-regular files (directories, etc). * New option (-k) can be used to specify lesskey files by name. * New option (-y) can be used to set a forward scroll limit (like -h sets a backward scroll limit). * File marks (set by the m command) are now preserved when a new file is edited. The ' command can thus be used to switch files. * New command ESC-/ searches all files (on the command line) for a pattern. * New command ESC-n repeats previous search, spanning files. * The N command has been changed to repeat the previous search in the reverse direction. The old N command is still available via :n. * New command ESC-N repeats previous search in the reverse direction and spanning files. * 8 bit characters are now supported. A new option (-g) can be used to strip off the eighth bit (the previous behavior). * Options which take a following string (like -t) may now optionally have a space between the option letter and the string. * Six new commands { } ( ) [ and ] can be used to match brackets of specific types, similar to vi % command. * New commands z and w move forward/backward one window and simultaneously set the window size. * Prompt string expansion now has %L for line number of the last line in the file, and %E for the name of the editor. Also, % escapes which refer to a line (b=bottom, t=top, etc.) can use j for the jump target line. * New environment variable LESSEDIT can be used to tailor the command string passed to the editor by the v command. * Examining a file which was previously examined will return to the same position in the file. * A "%" is expanded to the current filename and a "#" to the previous filename, in both shell commands and the E command. (Previously % worked only in shell commands and # worked only in the E command.) * New command ":ta" is equivalent to "-t". * New command "s" is equivalent to "-l". * The - command may be followed by "+X" to revert to the default for option X, or "-X" to get the opposite of the default. * Lesskey files may now include characters after the action as extra input to be parsed after the action; for example: "toggle-option X" to toggle a specific option X. diff --git a/contrib/less/ch.c b/contrib/less/ch.c index b297e7483e7b..fd53b2d66e38 100644 --- a/contrib/less/ch.c +++ b/contrib/less/ch.c @@ -1,937 +1,939 @@ /* * Copyright (C) 1984-2023 Mark Nudelman * * You may distribute under the terms of either the GNU General Public * License or the Less License, as specified in the README file. * * For more information, see the README file. */ /* * Low level character input from the input file. * We use these special purpose routines which optimize moving * both forward and backward from the current read pointer. */ #include "less.h" #if MSDOS_COMPILER==WIN32C #include #include #endif #if HAVE_PROCFS #include #if HAVE_LINUX_MAGIC_H #include #endif #endif typedef POSITION BLOCKNUM; public int ignore_eoi; /* * Pool of buffers holding the most recently used blocks of the input file. * The buffer pool is kept as a doubly-linked circular list, * in order from most- to least-recently used. * The circular list is anchored by the file state "thisfile". */ struct bufnode { struct bufnode *next, *prev; struct bufnode *hnext, *hprev; }; #define LBUFSIZE 8192 struct buf { struct bufnode node; BLOCKNUM block; unsigned int datasize; unsigned char data[LBUFSIZE]; }; #define bufnode_buf(bn) ((struct buf *) bn) /* * The file state is maintained in a filestate structure. * A pointer to the filestate is kept in the ifile structure. */ #define BUFHASH_SIZE 1024 struct filestate { struct bufnode buflist; struct bufnode hashtbl[BUFHASH_SIZE]; int file; int flags; POSITION fpos; int nbufs; BLOCKNUM block; unsigned int offset; POSITION fsize; }; #define ch_bufhead thisfile->buflist.next #define ch_buftail thisfile->buflist.prev #define ch_nbufs thisfile->nbufs #define ch_block thisfile->block #define ch_offset thisfile->offset #define ch_fpos thisfile->fpos #define ch_fsize thisfile->fsize #define ch_flags thisfile->flags #define ch_file thisfile->file #define END_OF_CHAIN (&thisfile->buflist) #define END_OF_HCHAIN(h) (&thisfile->hashtbl[h]) #define BUFHASH(blk) ((blk) & (BUFHASH_SIZE-1)) /* * Macros to manipulate the list of buffers in thisfile->buflist. */ #define FOR_BUFS(bn) \ for (bn = ch_bufhead; bn != END_OF_CHAIN; bn = bn->next) #define BUF_RM(bn) \ (bn)->next->prev = (bn)->prev; \ (bn)->prev->next = (bn)->next; #define BUF_INS_HEAD(bn) \ (bn)->next = ch_bufhead; \ (bn)->prev = END_OF_CHAIN; \ ch_bufhead->prev = (bn); \ ch_bufhead = (bn); #define BUF_INS_TAIL(bn) \ (bn)->next = END_OF_CHAIN; \ (bn)->prev = ch_buftail; \ ch_buftail->next = (bn); \ ch_buftail = (bn); /* * Macros to manipulate the list of buffers in thisfile->hashtbl[n]. */ #define FOR_BUFS_IN_CHAIN(h,bn) \ for (bn = thisfile->hashtbl[h].hnext; \ bn != END_OF_HCHAIN(h); bn = bn->hnext) #define BUF_HASH_RM(bn) \ (bn)->hnext->hprev = (bn)->hprev; \ (bn)->hprev->hnext = (bn)->hnext; #define BUF_HASH_INS(bn,h) \ (bn)->hnext = thisfile->hashtbl[h].hnext; \ (bn)->hprev = END_OF_HCHAIN(h); \ thisfile->hashtbl[h].hnext->hprev = (bn); \ thisfile->hashtbl[h].hnext = (bn); static struct filestate *thisfile; static int ch_ungotchar = -1; static int maxbufs = -1; extern int autobuf; extern int sigs; extern int secure; extern int screen_trashed; extern int follow_mode; extern int waiting_for_data; extern constant char helpdata[]; extern constant int size_helpdata; extern IFILE curr_ifile; #if LOGFILE extern int logfile; extern char *namelogfile; #endif static int ch_addbuf(); /* * Get the character pointed to by the read pointer. */ static int ch_get(void) { struct buf *bp; struct bufnode *bn; int n; int read_again; int h; POSITION pos; POSITION len; if (thisfile == NULL) return (EOI); /* * Quick check for the common case where * the desired char is in the head buffer. */ if (ch_bufhead != END_OF_CHAIN) { bp = bufnode_buf(ch_bufhead); if (ch_block == bp->block && ch_offset < bp->datasize) return bp->data[ch_offset]; } /* * Look for a buffer holding the desired block. */ waiting_for_data = FALSE; h = BUFHASH(ch_block); FOR_BUFS_IN_CHAIN(h, bn) { bp = bufnode_buf(bn); if (bp->block == ch_block) { if (ch_offset >= bp->datasize) /* * Need more data in this buffer. */ break; goto found; } } if (bn == END_OF_HCHAIN(h)) { /* * Block is not in a buffer. * Take the least recently used buffer * and read the desired block into it. * If the LRU buffer has data in it, * then maybe allocate a new buffer. */ if (ch_buftail == END_OF_CHAIN || bufnode_buf(ch_buftail)->block != -1) { /* * There is no empty buffer to use. * Allocate a new buffer if: * 1. We can't seek on this file and -b is not in effect; or * 2. We haven't allocated the max buffers for this file yet. */ if ((autobuf && !(ch_flags & CH_CANSEEK)) || (maxbufs < 0 || ch_nbufs < maxbufs)) if (ch_addbuf()) /* * Allocation failed: turn off autobuf. */ autobuf = OPT_OFF; } bn = ch_buftail; bp = bufnode_buf(bn); BUF_HASH_RM(bn); /* Remove from old hash chain. */ bp->block = ch_block; bp->datasize = 0; BUF_HASH_INS(bn, h); /* Insert into new hash chain. */ } for (;;) { pos = (ch_block * LBUFSIZE) + bp->datasize; if ((len = ch_length()) != NULL_POSITION && pos >= len) /* * At end of file. */ return (EOI); if (pos != ch_fpos) { /* * Not at the correct position: must seek. * If input is a pipe, we're in trouble (can't seek on a pipe). * Some data has been lost: just return "?". */ if (!(ch_flags & CH_CANSEEK)) return ('?'); if (lseek(ch_file, (off_t)pos, SEEK_SET) == BAD_LSEEK) { error("seek error", NULL_PARG); clear_eol(); return (EOI); } ch_fpos = pos; } /* * Read the block. * If we read less than a full block, that's ok. * We use partial block and pick up the rest next time. */ if (ch_ungotchar != -1) { bp->data[bp->datasize] = ch_ungotchar; n = 1; ch_ungotchar = -1; } else if (ch_flags & CH_HELPFILE) { bp->data[bp->datasize] = helpdata[ch_fpos]; n = 1; } else { n = iread(ch_file, &bp->data[bp->datasize], (unsigned int)(LBUFSIZE - bp->datasize)); } read_again = FALSE; if (n == READ_INTR) { ch_fsize = pos; return (EOI); } if (n == READ_AGAIN) { read_again = TRUE; n = 0; } if (n < 0) { #if MSDOS_COMPILER==WIN32C if (errno != EPIPE) #endif { error("read error", NULL_PARG); clear_eol(); } n = 0; } #if LOGFILE /* * If we have a log file, write the new data to it. */ if (!secure && logfile >= 0 && n > 0) write(logfile, (char *) &bp->data[bp->datasize], n); #endif ch_fpos += n; bp->datasize += n; if (n == 0) { /* Either end of file or no data available. * read_again indicates the latter. */ if (!read_again) ch_fsize = pos; if (ignore_eoi || read_again) { /* Wait a while, then try again. */ if (!waiting_for_data) { PARG parg; parg.p_string = wait_message(); ixerror("%s", &parg); waiting_for_data = TRUE; } sleep_ms(50); /* Reduce system load */ } if (ignore_eoi && follow_mode == FOLLOW_NAME && curr_ifile_changed()) { /* screen_trashed=2 causes make_display to reopen the file. */ screen_trashed = 2; return (EOI); } if (sigs) return (EOI); } found: if (ch_bufhead != bn) { /* * Move the buffer to the head of the buffer chain. * This orders the buffer chain, most- to least-recently used. */ BUF_RM(bn); BUF_INS_HEAD(bn); /* * Move to head of hash chain too. */ BUF_HASH_RM(bn); BUF_HASH_INS(bn, h); } if (ch_offset < bp->datasize) break; /* * After all that, we still don't have enough data. * Go back and try again. */ } return (bp->data[ch_offset]); } /* * ch_ungetchar is a rather kludgy and limited way to push * a single char onto an input file descriptor. */ public void ch_ungetchar(int c) { if (c != -1 && ch_ungotchar != -1) error("ch_ungetchar overrun", NULL_PARG); ch_ungotchar = c; } #if LOGFILE /* * Close the logfile. * If we haven't read all of standard input into it, do that now. */ public void end_logfile(void) { static int tried = FALSE; if (logfile < 0) return; if (!tried && ch_fsize == NULL_POSITION) { tried = TRUE; ierror("Finishing logfile", NULL_PARG); while (ch_forw_get() != EOI) if (ABORT_SIGS()) break; } close(logfile); logfile = -1; free(namelogfile); namelogfile = NULL; } /* * Start a log file AFTER less has already been running. * Invoked from the - command; see toggle_option(). * Write all the existing buffered data to the log file. */ public void sync_logfile(void) { struct buf *bp; struct bufnode *bn; int warned = FALSE; BLOCKNUM block; BLOCKNUM nblocks; + if (logfile < 0) + return; nblocks = (ch_fpos + LBUFSIZE - 1) / LBUFSIZE; for (block = 0; block < nblocks; block++) { int wrote = FALSE; FOR_BUFS(bn) { bp = bufnode_buf(bn); if (bp->block == block) { write(logfile, (char *) bp->data, bp->datasize); wrote = TRUE; break; } } if (!wrote && !warned) { error("Warning: log file is incomplete", NULL_PARG); warned = TRUE; } } } #endif /* * Determine if a specific block is currently in one of the buffers. */ static int buffered(BLOCKNUM block) { struct buf *bp; struct bufnode *bn; int h; h = BUFHASH(block); FOR_BUFS_IN_CHAIN(h, bn) { bp = bufnode_buf(bn); if (bp->block == block) return (TRUE); } return (FALSE); } /* * Seek to a specified position in the file. * Return 0 if successful, non-zero if can't seek there. */ public int ch_seek(POSITION pos) { BLOCKNUM new_block; POSITION len; if (thisfile == NULL) return (0); len = ch_length(); if (pos < ch_zero() || (len != NULL_POSITION && pos > len)) return (1); new_block = pos / LBUFSIZE; if (!(ch_flags & CH_CANSEEK) && pos != ch_fpos && !buffered(new_block)) { if (ch_fpos > pos) return (1); while (ch_fpos < pos) { if (ch_forw_get() == EOI) return (1); if (ABORT_SIGS()) return (1); } return (0); } /* * Set read pointer. */ ch_block = new_block; ch_offset = pos % LBUFSIZE; return (0); } /* * Seek to the end of the file. */ public int ch_end_seek(void) { POSITION len; if (thisfile == NULL) return (0); if (ch_flags & CH_CANSEEK) ch_fsize = filesize(ch_file); len = ch_length(); if (len != NULL_POSITION) return (ch_seek(len)); /* * Do it the slow way: read till end of data. */ while (ch_forw_get() != EOI) if (ABORT_SIGS()) return (1); return (0); } /* * Seek to the last position in the file that is currently buffered. */ public int ch_end_buffer_seek(void) { struct buf *bp; struct bufnode *bn; POSITION buf_pos; POSITION end_pos; if (thisfile == NULL || (ch_flags & CH_CANSEEK)) return (ch_end_seek()); end_pos = 0; FOR_BUFS(bn) { bp = bufnode_buf(bn); buf_pos = (bp->block * LBUFSIZE) + bp->datasize; if (buf_pos > end_pos) end_pos = buf_pos; } return (ch_seek(end_pos)); } /* * Seek to the beginning of the file, or as close to it as we can get. * We may not be able to seek there if input is a pipe and the * beginning of the pipe is no longer buffered. */ public int ch_beg_seek(void) { struct bufnode *bn; struct bufnode *firstbn; /* * Try a plain ch_seek first. */ if (ch_seek(ch_zero()) == 0) return (0); /* * Can't get to position 0. * Look thru the buffers for the one closest to position 0. */ firstbn = ch_bufhead; if (firstbn == END_OF_CHAIN) return (1); FOR_BUFS(bn) { if (bufnode_buf(bn)->block < bufnode_buf(firstbn)->block) firstbn = bn; } ch_block = bufnode_buf(firstbn)->block; ch_offset = 0; return (0); } /* * Return the length of the file, if known. */ public POSITION ch_length(void) { if (thisfile == NULL) return (NULL_POSITION); if (ignore_eoi) return (NULL_POSITION); if (ch_flags & CH_HELPFILE) return (size_helpdata); if (ch_flags & CH_NODATA) return (0); return (ch_fsize); } /* * Return the current position in the file. */ public POSITION ch_tell(void) { if (thisfile == NULL) return (NULL_POSITION); return (ch_block * LBUFSIZE) + ch_offset; } /* * Get the current char and post-increment the read pointer. */ public int ch_forw_get(void) { int c; if (thisfile == NULL) return (EOI); c = ch_get(); if (c == EOI) return (EOI); if (ch_offset < LBUFSIZE-1) ch_offset++; else { ch_block ++; ch_offset = 0; } return (c); } /* * Pre-decrement the read pointer and get the new current char. */ public int ch_back_get(void) { if (thisfile == NULL) return (EOI); if (ch_offset > 0) ch_offset --; else { if (ch_block <= 0) return (EOI); if (!(ch_flags & CH_CANSEEK) && !buffered(ch_block-1)) return (EOI); ch_block--; ch_offset = LBUFSIZE-1; } return (ch_get()); } /* * Set max amount of buffer space. * bufspace is in units of 1024 bytes. -1 mean no limit. */ public void ch_setbufspace(int bufspace) { if (bufspace < 0) maxbufs = -1; else { int lbufk = LBUFSIZE / 1024; maxbufs = bufspace / lbufk + (bufspace % lbufk != 0); if (maxbufs < 1) maxbufs = 1; } } /* * Flush (discard) any saved file state, including buffer contents. */ public void ch_flush(void) { struct bufnode *bn; if (thisfile == NULL) return; if (!(ch_flags & CH_CANSEEK)) { /* * If input is a pipe, we don't flush buffer contents, * since the contents can't be recovered. */ ch_fsize = NULL_POSITION; return; } /* * Initialize all the buffers. */ FOR_BUFS(bn) { bufnode_buf(bn)->block = -1; } /* * Figure out the size of the file, if we can. */ ch_fsize = filesize(ch_file); /* * Seek to a known position: the beginning of the file. */ ch_fpos = 0; ch_block = 0; /* ch_fpos / LBUFSIZE; */ ch_offset = 0; /* ch_fpos % LBUFSIZE; */ #if HAVE_PROCFS /* * This is a kludge to workaround a Linux kernel bug: files in * /proc have a size of 0 according to fstat() but have readable * data. They are sometimes, but not always, seekable. * Force them to be non-seekable here. */ if (ch_fsize == 0) { struct statfs st; if (fstatfs(ch_file, &st) == 0) { if (st.f_type == PROC_SUPER_MAGIC) { ch_fsize = NULL_POSITION; ch_flags &= ~CH_CANSEEK; } } } #endif if (lseek(ch_file, (off_t)0, SEEK_SET) == BAD_LSEEK) { /* * Warning only; even if the seek fails for some reason, * there's a good chance we're at the beginning anyway. * {{ I think this is bogus reasoning. }} */ error("seek error to 0", NULL_PARG); } } /* * Allocate a new buffer. * The buffer is added to the tail of the buffer chain. */ static int ch_addbuf(void) { struct buf *bp; struct bufnode *bn; /* * Allocate and initialize a new buffer and link it * onto the tail of the buffer list. */ bp = (struct buf *) calloc(1, sizeof(struct buf)); if (bp == NULL) return (1); ch_nbufs++; bp->block = -1; bn = &bp->node; BUF_INS_TAIL(bn); BUF_HASH_INS(bn, 0); return (0); } /* * */ static void init_hashtbl(void) { int h; for (h = 0; h < BUFHASH_SIZE; h++) { thisfile->hashtbl[h].hnext = END_OF_HCHAIN(h); thisfile->hashtbl[h].hprev = END_OF_HCHAIN(h); } } /* * Delete all buffers for this file. */ static void ch_delbufs(void) { struct bufnode *bn; while (ch_bufhead != END_OF_CHAIN) { bn = ch_bufhead; BUF_RM(bn); free(bufnode_buf(bn)); } ch_nbufs = 0; init_hashtbl(); } /* * Is it possible to seek on a file descriptor? */ public int seekable(int f) { #if MSDOS_COMPILER extern int fd0; if (f == fd0 && !isatty(fd0)) { /* * In MS-DOS, pipes are seekable. Check for * standard input, and pretend it is not seekable. */ return (0); } #endif return (lseek(f, (off_t)1, SEEK_SET) != BAD_LSEEK); } /* * Force EOF to be at the current read position. * This is used after an ignore_eof read, during which the EOF may change. */ public void ch_set_eof(void) { if (ch_fsize != NULL_POSITION && ch_fsize < ch_fpos) ch_fsize = ch_fpos; } /* * Initialize file state for a new file. */ public void ch_init(int f, int flags) { /* * See if we already have a filestate for this file. */ thisfile = (struct filestate *) get_filestate(curr_ifile); if (thisfile == NULL) { /* * Allocate and initialize a new filestate. */ thisfile = (struct filestate *) ecalloc(1, sizeof(struct filestate)); thisfile->buflist.next = thisfile->buflist.prev = END_OF_CHAIN; thisfile->nbufs = 0; thisfile->flags = flags; thisfile->fpos = 0; thisfile->block = 0; thisfile->offset = 0; thisfile->file = -1; thisfile->fsize = NULL_POSITION; init_hashtbl(); /* * Try to seek; set CH_CANSEEK if it works. */ if ((flags & CH_CANSEEK) && !seekable(f)) ch_flags &= ~CH_CANSEEK; set_filestate(curr_ifile, (void *) thisfile); } if (thisfile->file == -1) thisfile->file = f; ch_flush(); } /* * Close a filestate. */ public void ch_close(void) { int keepstate = FALSE; if (thisfile == NULL) return; if ((ch_flags & (CH_CANSEEK|CH_POPENED|CH_HELPFILE)) && !(ch_flags & CH_KEEPOPEN)) { /* * We can seek or re-open, so we don't need to keep buffers. */ ch_delbufs(); } else keepstate = TRUE; if (!(ch_flags & CH_KEEPOPEN)) { /* * We don't need to keep the file descriptor open * (because we can re-open it.) * But don't really close it if it was opened via popen(), * because pclose() wants to close it. */ if (!(ch_flags & (CH_POPENED|CH_HELPFILE))) close(ch_file); ch_file = -1; } else keepstate = TRUE; if (!keepstate) { /* * We don't even need to keep the filestate structure. */ free(thisfile); thisfile = NULL; set_filestate(curr_ifile, (void *) NULL); } } /* * Return ch_flags for the current file. */ public int ch_getflags(void) { if (thisfile == NULL) return (0); return (ch_flags); } #if 0 static void ch_dump(struct filestate *fs) { struct buf *bp; struct bufnode *bn; unsigned char *s; if (fs == NULL) { printf(" --no filestate\n"); return; } printf(" file %d, flags %x, fpos %x, fsize %x, blk/off %x/%x\n", fs->file, fs->flags, fs->fpos, fs->fsize, fs->block, fs->offset); printf(" %d bufs:\n", fs->nbufs); for (bn = fs->next; bn != &fs->buflist; bn = bn->next) { bp = bufnode_buf(bn); printf("%x: blk %x, size %x \"", bp, bp->block, bp->datasize); for (s = bp->data; s < bp->data + 30; s++) if (*s >= ' ' && *s < 0x7F) printf("%c", *s); else printf("."); printf("\"\n"); } } #endif diff --git a/contrib/less/command.c b/contrib/less/command.c index 88c0cb49ee77..c1003d55fada 100644 --- a/contrib/less/command.c +++ b/contrib/less/command.c @@ -1,2095 +1,2096 @@ /* $FreeBSD$ */ /* * Copyright (C) 1984-2023 Mark Nudelman * * You may distribute under the terms of either the GNU General Public * License or the Less License, as specified in the README file. * * For more information, see the README file. */ /* * User-level command processor. */ #include "less.h" #if MSDOS_COMPILER==WIN32C #include #endif #include "position.h" #include "option.h" #include "cmd.h" extern int erase_char, erase2_char, kill_char; extern int sigs; extern int quit_if_one_screen; extern int one_screen; extern int squished; extern int sc_width; extern int sc_height; extern char *kent; extern int swindow; extern int jump_sline; extern int quitting; extern int wscroll; extern int top_scroll; extern int ignore_eoi; extern int secure; extern int hshift; extern int bs_mode; extern int proc_backspace; extern int show_attn; extern int less_is_more; extern int status_col; extern POSITION highest_hilite; extern POSITION start_attnpos; extern POSITION end_attnpos; extern char *every_first_cmd; extern char version[]; extern struct scrpos initial_scrpos; extern IFILE curr_ifile; extern void *ml_search; extern void *ml_examine; extern int wheel_lines; extern int header_lines; extern int def_search_type; extern int updown_match; #if SHELL_ESCAPE || PIPEC extern void *ml_shell; #endif #if EDITOR extern char *editor; extern char *editproto; #endif extern int screen_trashed; /* The screen has been overwritten */ extern int shift_count; extern int oldbot; extern int forw_prompt; extern int incr_search; extern int full_screen; #if MSDOS_COMPILER==WIN32C extern int utf_mode; #endif #if SHELL_ESCAPE static char *shellcmd = NULL; /* For holding last shell command for "!!" */ #endif static int mca; /* The multicharacter command (action) */ static int search_type; /* The previous type of search */ static int last_search_type; /* Type of last executed search */ static LINENUM number; /* The number typed by the user */ static long fraction; /* The fractional part of the number */ static struct loption *curropt; static int opt_lower; static int optflag; static int optgetname; static POSITION bottompos; static int save_hshift; static int save_bs_mode; static int save_proc_backspace; #if PIPEC static char pipec; #endif /* Stack of ungotten chars (via ungetcc) */ struct ungot { struct ungot *ug_next; LWCHAR ug_char; }; static struct ungot* ungot = NULL; static void multi_search (char *pattern, int n, int silent); /* * Move the cursor to start of prompt line before executing a command. * This looks nicer if the command takes a long time before * updating the screen. */ static void cmd_exec(void) { clear_attn(); clear_bot(); flush(); } /* * Indicate we are reading a multi-character command. */ static void set_mca(int action) { mca = action; clear_bot(); clear_cmd(); } /* * Indicate we are not reading a multi-character command. */ static void clear_mca(void) { if (mca == 0) return; mca = 0; } /* * Set up the display to start a new multi-character command. */ static void start_mca(int action, constant char *prompt, void *mlist, int cmdflags) { set_mca(action); cmd_putstr(prompt); set_mlist(mlist, cmdflags); } public int in_mca(void) { return (mca != 0 && mca != A_PREFIX); } /* * Set up the display to start a new search command. */ static void mca_search1(void) { int i; #if HILITE_SEARCH if (search_type & SRCH_FILTER) set_mca(A_FILTER); else #endif if (search_type & SRCH_FORW) set_mca(A_F_SEARCH); else set_mca(A_B_SEARCH); if (search_type & SRCH_NO_MATCH) cmd_putstr("Non-match "); if (search_type & SRCH_FIRST_FILE) cmd_putstr("First-file "); if (search_type & SRCH_PAST_EOF) cmd_putstr("EOF-ignore "); if (search_type & SRCH_NO_MOVE) cmd_putstr("Keep-pos "); if (search_type & SRCH_NO_REGEX) cmd_putstr("Regex-off "); if (search_type & SRCH_WRAP) cmd_putstr("Wrap "); for (i = 1; i <= NUM_SEARCH_COLORS; i++) { if (search_type & SRCH_SUBSEARCH(i)) { - char buf[8]; + char buf[INT_STRLEN_BOUND(int)+8]; SNPRINTF1(buf, sizeof(buf), "Sub-%d ", i); cmd_putstr(buf); } } #if HILITE_SEARCH if (search_type & SRCH_FILTER) cmd_putstr("&/"); else #endif if (search_type & SRCH_FORW) cmd_putstr("/"); else cmd_putstr("?"); forw_prompt = 0; } static void mca_search(void) { mca_search1(); set_mlist(ml_search, 0); } /* * Set up the display to start a new toggle-option command. */ static void mca_opt_toggle(void) { int no_prompt; int flag; char *dash; no_prompt = (optflag & OPT_NO_PROMPT); flag = (optflag & ~OPT_NO_PROMPT); dash = (flag == OPT_NO_TOGGLE) ? "_" : "-"; set_mca(A_OPT_TOGGLE); cmd_putstr(dash); if (optgetname) cmd_putstr(dash); if (no_prompt) cmd_putstr("(P)"); switch (flag) { case OPT_UNSET: cmd_putstr("+"); break; case OPT_SET: cmd_putstr("!"); break; } forw_prompt = 0; set_mlist(NULL, 0); } /* * Execute a multicharacter command. */ static void exec_mca(void) { char *cbuf; cmd_exec(); cbuf = get_cmdbuf(); if (cbuf == NULL) return; switch (mca) { case A_F_SEARCH: case A_B_SEARCH: multi_search(cbuf, (int) number, 0); break; #if HILITE_SEARCH case A_FILTER: search_type ^= SRCH_NO_MATCH; set_filter_pattern(cbuf, search_type); break; #endif case A_FIRSTCMD: /* * Skip leading spaces or + signs in the string. */ while (*cbuf == '+' || *cbuf == ' ') cbuf++; if (every_first_cmd != NULL) free(every_first_cmd); if (*cbuf == '\0') every_first_cmd = NULL; else every_first_cmd = save(cbuf); break; case A_OPT_TOGGLE: toggle_option(curropt, opt_lower, cbuf, optflag); curropt = NULL; break; case A_F_BRACKET: match_brac(cbuf[0], cbuf[1], 1, (int) number); break; case A_B_BRACKET: match_brac(cbuf[1], cbuf[0], 0, (int) number); break; #if EXAMINE case A_EXAMINE: if (secure) break; edit_list(cbuf); #if TAGS /* If tag structure is loaded then clean it up. */ cleantags(); #endif break; #endif #if SHELL_ESCAPE case A_SHELL: /* * !! just uses whatever is in shellcmd. * Otherwise, copy cmdbuf to shellcmd, * expanding any special characters ("%" or "#"). */ if (*cbuf != '!') { if (shellcmd != NULL) free(shellcmd); shellcmd = fexpand(cbuf); } if (secure) break; if (shellcmd == NULL) lsystem("", "!done"); else lsystem(shellcmd, "!done"); break; case A_PSHELL: if (secure) break; lsystem(pr_expand(cbuf), "#done"); break; #endif #if PIPEC case A_PIPE: if (secure) break; (void) pipe_mark(pipec, cbuf); error("|done", NULL_PARG); break; #endif } } /* * Is a character an erase or kill char? */ static int is_erase_char(int c) { return (c == erase_char || c == erase2_char || c == kill_char); } /* * Is a character a carriage return or newline? */ static int is_newline_char(int c) { return (c == '\n' || c == '\r'); } /* * Handle the first char of an option (after the initial dash). */ static int mca_opt_first_char(int c) { int no_prompt = (optflag & OPT_NO_PROMPT); int flag = (optflag & ~OPT_NO_PROMPT); if (flag == OPT_NO_TOGGLE) { switch (c) { case '_': /* "__" = long option name. */ optgetname = TRUE; mca_opt_toggle(); return (MCA_MORE); } } else { switch (c) { case '+': /* "-+" = UNSET. */ optflag = no_prompt | ((flag == OPT_UNSET) ? OPT_TOGGLE : OPT_UNSET); mca_opt_toggle(); return (MCA_MORE); case '!': /* "-!" = SET */ optflag = no_prompt | ((flag == OPT_SET) ? OPT_TOGGLE : OPT_SET); mca_opt_toggle(); return (MCA_MORE); case CONTROL('P'): optflag ^= OPT_NO_PROMPT; mca_opt_toggle(); return (MCA_MORE); case '-': /* "--" = long option name. */ optgetname = TRUE; mca_opt_toggle(); return (MCA_MORE); } } /* Char was not handled here. */ return (NO_MCA); } /* * Add a char to a long option name. * See if we've got a match for an option name yet. * If so, display the complete name and stop * accepting chars until user hits RETURN. */ static int mca_opt_nonfirst_char(int c) { char *p; char *oname; int err; if (curropt != NULL) { /* * Already have a match for the name. * Don't accept anything but erase/kill. */ if (is_erase_char(c)) return (MCA_DONE); return (MCA_MORE); } /* * Add char to cmd buffer and try to match * the option name. */ if (cmd_char(c) == CC_QUIT) return (MCA_DONE); p = get_cmdbuf(); if (p == NULL) return (MCA_MORE); opt_lower = ASCII_IS_LOWER(p[0]); err = 0; curropt = findopt_name(&p, &oname, &err); if (curropt != NULL) { /* * Got a match. * Remember the option and * display the full option name. */ cmd_reset(); mca_opt_toggle(); for (p = oname; *p != '\0'; p++) { c = *p; if (!opt_lower && ASCII_IS_LOWER(c)) c = ASCII_TO_UPPER(c); if (cmd_char(c) != CC_OK) return (MCA_DONE); } } else if (err != OPT_AMBIG) { bell(); } return (MCA_MORE); } /* * Handle a char of an option toggle command. */ static int mca_opt_char(int c) { PARG parg; /* * This may be a short option (single char), * or one char of a long option name, * or one char of the option parameter. */ if (curropt == NULL && len_cmdbuf() == 0) { int ret = mca_opt_first_char(c); if (ret != NO_MCA) return (ret); } if (optgetname) { /* We're getting a long option name. */ if (!is_newline_char(c) && c != '=') return (mca_opt_nonfirst_char(c)); if (curropt == NULL) { parg.p_string = get_cmdbuf(); if (parg.p_string == NULL) return (MCA_MORE); error("There is no --%s option", &parg); return (MCA_DONE); } optgetname = FALSE; cmd_reset(); } else { if (is_erase_char(c)) return (NO_MCA); if (curropt != NULL) /* We're getting the option parameter. */ return (NO_MCA); curropt = findopt(c); if (curropt == NULL) { parg.p_string = propt(c); error("There is no %s option", &parg); return (MCA_DONE); } opt_lower = ASCII_IS_LOWER(c); } /* * If the option which was entered does not take a * parameter, toggle the option immediately, * so user doesn't have to hit RETURN. */ if ((optflag & ~OPT_NO_PROMPT) != OPT_TOGGLE || !opt_has_param(curropt)) { toggle_option(curropt, opt_lower, "", optflag); return (MCA_DONE); } /* * Display a prompt appropriate for the option parameter. */ start_mca(A_OPT_TOGGLE, opt_prompt(curropt), (void*)NULL, 0); return (MCA_MORE); } /* * Normalize search type. */ public int norm_search_type(int st) { /* WRAP and PAST_EOF are mutually exclusive. */ if ((st & (SRCH_PAST_EOF|SRCH_WRAP)) == (SRCH_PAST_EOF|SRCH_WRAP)) st ^= SRCH_PAST_EOF; return st; } /* * Handle a char of a search command. */ static int mca_search_char(int c) { int flag = 0; /* * Certain characters as the first char of * the pattern have special meaning: * ! Toggle the NO_MATCH flag * * Toggle the PAST_EOF flag * @ Toggle the FIRST_FILE flag */ if (len_cmdbuf() > 0) return (NO_MCA); switch (c) { case '*': if (less_is_more) break; case CONTROL('E'): /* ignore END of file */ if (mca != A_FILTER) flag = SRCH_PAST_EOF; + search_type &= ~SRCH_WRAP; break; case '@': if (less_is_more) break; case CONTROL('F'): /* FIRST file */ if (mca != A_FILTER) flag = SRCH_FIRST_FILE; break; case CONTROL('K'): /* KEEP position */ if (mca != A_FILTER) flag = SRCH_NO_MOVE; break; case CONTROL('S'): { /* SUBSEARCH */ - char buf[32]; + char buf[INT_STRLEN_BOUND(int)+24]; SNPRINTF1(buf, sizeof(buf), "Sub-pattern (1-%d):", NUM_SEARCH_COLORS); clear_bot(); cmd_putstr(buf); flush(); c = getcc(); if (c >= '1' && c <= '0'+NUM_SEARCH_COLORS) flag = SRCH_SUBSEARCH(c-'0'); else flag = -1; /* calls mca_search() below to repaint */ break; } case CONTROL('W'): /* WRAP around */ if (mca != A_FILTER) flag = SRCH_WRAP; break; case CONTROL('R'): /* Don't use REGULAR EXPRESSIONS */ flag = SRCH_NO_REGEX; break; case CONTROL('N'): /* NOT match */ case '!': flag = SRCH_NO_MATCH; break; } if (flag != 0) { if (flag != -1) search_type = norm_search_type(search_type ^ flag); mca_search(); return (MCA_MORE); } return (NO_MCA); } /* * Handle a character of a multi-character command. */ static int mca_char(int c) { int ret; switch (mca) { case 0: /* * We're not in a multicharacter command. */ return (NO_MCA); case A_PREFIX: /* * In the prefix of a command. * This not considered a multichar command * (even tho it uses cmdbuf, etc.). * It is handled in the commands() switch. */ return (NO_MCA); case A_DIGIT: /* * Entering digits of a number. * Terminated by a non-digit. */ if ((c >= '0' && c <= '9') || c == '.') break; switch (editchar(c, ECF_PEEK|ECF_NOHISTORY|ECF_NOCOMPLETE|ECF_NORIGHTLEFT)) { case A_NOACTION: /* * Ignore this char and get another one. */ return (MCA_MORE); case A_INVALID: /* * Not part of the number. * End the number and treat this char * as a normal command character. */ number = cmd_int(&fraction); clear_mca(); cmd_accept(); return (NO_MCA); } break; case A_OPT_TOGGLE: ret = mca_opt_char(c); if (ret != NO_MCA) return (ret); break; case A_F_SEARCH: case A_B_SEARCH: case A_FILTER: ret = mca_search_char(c); if (ret != NO_MCA) return (ret); break; default: /* Other multicharacter command. */ break; } /* * The multichar command is terminated by a newline. */ if (is_newline_char(c)) { /* * Execute the command. */ exec_mca(); return (MCA_DONE); } /* * Append the char to the command buffer. */ if (cmd_char(c) == CC_QUIT) /* * Abort the multi-char command. */ return (MCA_DONE); switch (mca) { case A_F_BRACKET: case A_B_BRACKET: if (len_cmdbuf() >= 2) { /* * Special case for the bracket-matching commands. * Execute the command after getting exactly two * characters from the user. */ exec_mca(); return (MCA_DONE); } break; case A_F_SEARCH: case A_B_SEARCH: if (incr_search) { /* Incremental search: do a search after every input char. */ int st = (search_type & (SRCH_FORW|SRCH_BACK|SRCH_NO_MATCH|SRCH_NO_REGEX|SRCH_NO_MOVE|SRCH_WRAP|SRCH_SUBSEARCH_ALL)); char *pattern = get_cmdbuf(); if (pattern == NULL) return (MCA_MORE); /* * Must save updown_match because mca_search * reinits it. That breaks history scrolling. * {{ This is ugly. mca_search probably shouldn't call set_mlist. }} */ int save_updown_match = updown_match; cmd_exec(); if (*pattern == '\0') { /* User has backspaced to an empty pattern. */ undo_search(1); } else { if (search(st | SRCH_INCR, pattern, 1) != 0) /* No match, invalid pattern, etc. */ undo_search(1); } /* Redraw the search prompt and search string. */ if (!full_screen) { clear(); repaint(); } mca_search1(); updown_match = save_updown_match; cmd_repaint(NULL); } break; } /* * Need another character. */ return (MCA_MORE); } /* * Discard any buffered file data. */ static void clear_buffers(void) { if (!(ch_getflags() & CH_CANSEEK)) return; ch_flush(); clr_linenum(); #if HILITE_SEARCH clr_hilite(); #endif } /* * Make sure the screen is displayed. */ static void make_display(void) { /* * If not full_screen, we can't rely on scrolling to fill the screen. * We need to clear and repaint screen before any change. */ if (!full_screen && !(quit_if_one_screen && one_screen)) clear(); /* * If nothing is displayed yet, display starting from initial_scrpos. */ if (empty_screen()) { if (initial_scrpos.pos == NULL_POSITION) jump_loc(ch_zero(), 1); else jump_loc(initial_scrpos.pos, initial_scrpos.ln); } else if (screen_trashed || !full_screen) { int save_top_scroll = top_scroll; int save_ignore_eoi = ignore_eoi; top_scroll = 1; ignore_eoi = 0; if (screen_trashed == 2) { /* Special case used by ignore_eoi: re-open the input file * and jump to the end of the file. */ reopen_curr_ifile(); jump_forw(); } repaint(); top_scroll = save_top_scroll; ignore_eoi = save_ignore_eoi; } } /* * Display the appropriate prompt. */ static void prompt(void) { constant char *p; if (ungot != NULL && ungot->ug_char != CHAR_END_COMMAND) { /* * No prompt necessary if commands are from * ungotten chars rather than from the user. */ return; } /* * Make sure the screen is displayed. */ make_display(); bottompos = position(BOTTOM_PLUS_ONE); /* * If we've hit EOF on the last file and the -E flag is set, quit. */ if (get_quit_at_eof() == OPT_ONPLUS && eof_displayed() && !(ch_getflags() & CH_HELPFILE) && next_ifile(curr_ifile) == NULL_IFILE) quit(QUIT_OK); /* * If the entire file is displayed and the -F flag is set, quit. */ if (quit_if_one_screen && entire_file_displayed() && !(ch_getflags() & CH_HELPFILE) && next_ifile(curr_ifile) == NULL_IFILE) quit(QUIT_OK); quit_if_one_screen = FALSE; /* only get one chance at this */ #if MSDOS_COMPILER==WIN32C /* * In Win32, display the file name in the window title. */ if (!(ch_getflags() & CH_HELPFILE)) { WCHAR w[MAX_PATH+16]; p = pr_expand("Less?f - %f."); MultiByteToWideChar(CP_ACP, 0, p, -1, w, sizeof(w)/sizeof(*w)); SetConsoleTitleW(w); } #endif /* * Select the proper prompt and display it. */ /* * If the previous action was a forward movement, * don't clear the bottom line of the display; * just print the prompt since the forward movement guarantees * that we're in the right position to display the prompt. * Clearing the line could cause a problem: for example, if the last * line displayed ended at the right screen edge without a newline, * then clearing would clear the last displayed line rather than * the prompt line. */ if (!forw_prompt) clear_bot(); clear_cmd(); forw_prompt = 0; p = pr_string(); #if HILITE_SEARCH if (is_filtering()) putstr("& "); #endif if (p == NULL || *p == '\0') { at_enter(AT_NORMAL|AT_COLOR_PROMPT); putchr(':'); at_exit(); } else { #if MSDOS_COMPILER==WIN32C WCHAR w[MAX_PATH*2]; char a[MAX_PATH*2]; MultiByteToWideChar(CP_ACP, 0, p, -1, w, sizeof(w)/sizeof(*w)); WideCharToMultiByte(utf_mode ? CP_UTF8 : GetConsoleOutputCP(), 0, w, -1, a, sizeof(a), NULL, NULL); p = a; #endif load_line(p); put_line(); } clear_eol(); } /* * Display the less version message. */ public void dispversion(void) { PARG parg; parg.p_string = version; error("less %s", &parg); } /* * Return a character to complete a partial command, if possible. */ static LWCHAR getcc_end_command(void) { switch (mca) { case A_DIGIT: /* We have a number but no command. Treat as #g. */ return ('g'); case A_F_SEARCH: case A_B_SEARCH: case A_FILTER: /* We have "/string" but no newline. Add the \n. */ return ('\n'); default: /* Some other incomplete command. Let user complete it. */ return ((ungot == NULL) ? getchr() : 0); } } /* * Get command character. * The character normally comes from the keyboard, * but may come from ungotten characters * (characters previously given to ungetcc or ungetsc). */ static LWCHAR getccu(void) { LWCHAR c = 0; while (c == 0) { if (ungot == NULL) { /* Normal case: no ungotten chars. * Get char from the user. */ c = getchr(); } else { /* Ungotten chars available: * Take the top of stack (most recent). */ struct ungot *ug = ungot; c = ug->ug_char; ungot = ug->ug_next; free(ug); if (c == CHAR_END_COMMAND) c = getcc_end_command(); } } return (c); } /* * Get a command character, but if we receive the orig sequence, * convert it to the repl sequence. */ static LWCHAR getcc_repl(char constant *orig, char constant *repl, LWCHAR (*gr_getc)(void), void (*gr_ungetc)(LWCHAR)) { LWCHAR c; LWCHAR keys[16]; int ki = 0; c = (*gr_getc)(); if (orig == NULL || orig[0] == '\0') return c; for (;;) { keys[ki] = c; if (c != orig[ki] || ki >= sizeof(keys)-1) { /* This is not orig we have been receiving. * If we have stashed chars in keys[], * unget them and return the first one. */ while (ki > 0) (*gr_ungetc)(keys[ki--]); return keys[0]; } if (orig[++ki] == '\0') { /* We've received the full orig sequence. * Return the repl sequence. */ ki = strlen(repl)-1; while (ki > 0) (*gr_ungetc)(repl[ki--]); return repl[0]; } /* We've received a partial orig sequence (ki chars of it). * Get next char and see if it continues to match orig. */ c = (*gr_getc)(); } } /* * Get command character. */ public int getcc(void) { /* Replace kent (keypad Enter) with a newline. */ return getcc_repl(kent, "\n", getccu, ungetcc); } /* * "Unget" a command character. * The next getcc() will return this character. */ public void ungetcc(LWCHAR c) { struct ungot *ug = (struct ungot *) ecalloc(1, sizeof(struct ungot)); ug->ug_char = c; ug->ug_next = ungot; ungot = ug; } /* * "Unget" a command character. * If any other chars are already ungotten, put this one after those. */ public void ungetcc_back(LWCHAR c) { struct ungot *ug = (struct ungot *) ecalloc(1, sizeof(struct ungot)); ug->ug_char = c; ug->ug_next = NULL; if (ungot == NULL) ungot = ug; else { struct ungot *pu; for (pu = ungot; pu->ug_next != NULL; pu = pu->ug_next) continue; pu->ug_next = ug; } } /* * Unget a whole string of command characters. * The next sequence of getcc()'s will return this string. */ public void ungetsc(char *s) { while (*s != '\0') ungetcc_back(*s++); } /* * Peek the next command character, without consuming it. */ public LWCHAR peekcc(void) { LWCHAR c = getcc(); ungetcc(c); return c; } /* * Search for a pattern, possibly in multiple files. * If SRCH_FIRST_FILE is set, begin searching at the first file. * If SRCH_PAST_EOF is set, continue the search thru multiple files. */ static void multi_search(char *pattern, int n, int silent) { int nomore; IFILE save_ifile; int changed_file; changed_file = 0; save_ifile = save_curr_ifile(); if ((search_type & (SRCH_FORW|SRCH_BACK)) == 0) search_type |= SRCH_FORW; if (search_type & SRCH_FIRST_FILE) { /* * Start at the first (or last) file * in the command line list. */ if (search_type & SRCH_FORW) nomore = edit_first(); else nomore = edit_last(); if (nomore) { unsave_ifile(save_ifile); return; } changed_file = 1; search_type &= ~SRCH_FIRST_FILE; } for (;;) { n = search(search_type, pattern, n); /* * The SRCH_NO_MOVE flag doesn't "stick": it gets cleared * after being used once. This allows "n" to work after * using a /@@ search. */ search_type &= ~SRCH_NO_MOVE; last_search_type = search_type; if (n == 0) { /* * Found it. */ unsave_ifile(save_ifile); return; } if (n < 0) /* * Some kind of error in the search. * Error message has been printed by search(). */ break; if ((search_type & SRCH_PAST_EOF) == 0) /* * We didn't find a match, but we're * supposed to search only one file. */ break; /* * Move on to the next file. */ if (search_type & SRCH_FORW) nomore = edit_next(1); else nomore = edit_prev(1); if (nomore) break; changed_file = 1; } /* * Didn't find it. * Print an error message if we haven't already. */ if (n > 0 && !silent) error("Pattern not found", NULL_PARG); if (changed_file) { /* * Restore the file we were originally viewing. */ reedit_ifile(save_ifile); } else { unsave_ifile(save_ifile); } } /* * Forward forever, or until a highlighted line appears. */ static int forw_loop(int until_hilite) { POSITION curr_len; if (ch_getflags() & CH_HELPFILE) return (A_NOACTION); cmd_exec(); jump_forw_buffered(); curr_len = ch_length(); highest_hilite = until_hilite ? curr_len : NULL_POSITION; ignore_eoi = 1; while (!sigs) { if (until_hilite && highest_hilite > curr_len) { bell(); break; } make_display(); forward(1, 0, 0); } ignore_eoi = 0; ch_set_eof(); /* * This gets us back in "F mode" after processing * a non-abort signal (e.g. window-change). */ if (sigs && !ABORT_SIGS()) return (until_hilite ? A_F_UNTIL_HILITE : A_F_FOREVER); return (A_NOACTION); } /* * Main command processor. * Accept and execute commands until a quit command. */ public void commands(void) { int c; int action; char *cbuf; int newaction; int save_jump_sline; int save_search_type; char *extra; char tbuf[2]; PARG parg; IFILE old_ifile; IFILE new_ifile; char *tagfile; search_type = SRCH_FORW; wscroll = (sc_height + 1) / 2; newaction = A_NOACTION; for (;;) { clear_mca(); cmd_accept(); number = 0; curropt = NULL; /* * See if any signals need processing. */ if (sigs) { psignals(); if (quitting) quit(QUIT_SAVED_STATUS); } /* * See if window size changed, for systems that don't * generate SIGWINCH. */ check_winch(); /* * Display prompt and accept a character. */ cmd_reset(); prompt(); if (sigs) continue; if (newaction == A_NOACTION) c = getcc(); again: if (sigs) continue; if (newaction != A_NOACTION) { action = newaction; newaction = A_NOACTION; } else { /* * If we are in a multicharacter command, call mca_char. * Otherwise we call fcmd_decode to determine the * action to be performed. */ if (mca) switch (mca_char(c)) { case MCA_MORE: /* * Need another character. */ c = getcc(); goto again; case MCA_DONE: /* * Command has been handled by mca_char. * Start clean with a prompt. */ continue; case NO_MCA: /* * Not a multi-char command * (at least, not anymore). */ break; } /* * Decode the command character and decide what to do. */ if (mca) { /* * We're in a multichar command. * Add the character to the command buffer * and display it on the screen. * If the user backspaces past the start * of the line, abort the command. */ if (cmd_char(c) == CC_QUIT || len_cmdbuf() == 0) continue; cbuf = get_cmdbuf(); if (cbuf == NULL) continue; } else { /* * Don't use cmd_char if we're starting fresh * at the beginning of a command, because we * don't want to echo the command until we know * it is a multichar command. We also don't * want erase_char/kill_char to be treated * as line editing characters. */ tbuf[0] = c; tbuf[1] = '\0'; cbuf = tbuf; } extra = NULL; action = fcmd_decode(cbuf, &extra); /* * If an "extra" string was returned, * process it as a string of command characters. */ if (extra != NULL) ungetsc(extra); } /* * Clear the cmdbuf string. * (But not if we're in the prefix of a command, * because the partial command string is kept there.) */ if (action != A_PREFIX) cmd_reset(); switch (action) { case A_DIGIT: /* * First digit of a number. */ start_mca(A_DIGIT, ":", (void*)NULL, CF_QUIT_ON_ERASE); goto again; case A_F_WINDOW: /* * Forward one window (and set the window size). */ if (number > 0) swindow = (int) number; /* FALLTHRU */ case A_F_SCREEN: /* * Forward one screen. */ if (number <= 0) number = get_swindow(); cmd_exec(); if (show_attn) set_attnpos(bottompos); forward((int) number, 0, 1); break; case A_B_WINDOW: /* * Backward one window (and set the window size). */ if (number > 0) swindow = (int) number; /* FALLTHRU */ case A_B_SCREEN: /* * Backward one screen. */ if (number <= 0) number = get_swindow(); cmd_exec(); backward((int) number, 0, 1); break; case A_F_LINE: /* * Forward N (default 1) line. */ if (number <= 0) number = 1; cmd_exec(); if (show_attn == OPT_ONPLUS && number > 1) set_attnpos(bottompos); forward((int) number, 0, 0); break; case A_B_LINE: /* * Backward N (default 1) line. */ if (number <= 0) number = 1; cmd_exec(); backward((int) number, 0, 0); break; case A_F_MOUSE: /* * Forward wheel_lines lines. */ cmd_exec(); forward(wheel_lines, 0, 0); break; case A_B_MOUSE: /* * Backward wheel_lines lines. */ cmd_exec(); backward(wheel_lines, 0, 0); break; case A_FF_LINE: /* * Force forward N (default 1) line. */ if (number <= 0) number = 1; cmd_exec(); if (show_attn == OPT_ONPLUS && number > 1) set_attnpos(bottompos); forward((int) number, 1, 0); break; case A_BF_LINE: /* * Force backward N (default 1) line. */ if (number <= 0) number = 1; cmd_exec(); backward((int) number, 1, 0); break; case A_FF_SCREEN: /* * Force forward one screen. */ if (number <= 0) number = get_swindow(); cmd_exec(); if (show_attn == OPT_ONPLUS) set_attnpos(bottompos); forward((int) number, 1, 0); break; case A_F_FOREVER: /* * Forward forever, ignoring EOF. */ if (show_attn) set_attnpos(bottompos); newaction = forw_loop(0); break; case A_F_UNTIL_HILITE: newaction = forw_loop(1); break; case A_F_SCROLL: /* * Forward N lines * (default same as last 'd' or 'u' command). */ if (number > 0) wscroll = (int) number; cmd_exec(); if (show_attn == OPT_ONPLUS) set_attnpos(bottompos); forward(wscroll, 0, 0); break; case A_B_SCROLL: /* * Forward N lines * (default same as last 'd' or 'u' command). */ if (number > 0) wscroll = (int) number; cmd_exec(); backward(wscroll, 0, 0); break; case A_FREPAINT: /* * Flush buffers, then repaint screen. * Don't flush the buffers on a pipe! */ clear_buffers(); /* FALLTHRU */ case A_REPAINT: /* * Repaint screen. */ cmd_exec(); repaint(); break; case A_GOLINE: /* * Go to line N, default beginning of file. * If N <= 0, ignore jump_sline in order to avoid * empty lines before the beginning of the file. */ save_jump_sline = jump_sline; if (number <= 0) { number = 1; jump_sline = 0; } cmd_exec(); jump_back(number); jump_sline = save_jump_sline; break; case A_PERCENT: /* * Go to a specified percentage into the file. */ if (number < 0) { number = 0; fraction = 0; } if (number > 100 || (number == 100 && fraction != 0)) { number = 100; fraction = 0; } cmd_exec(); jump_percent((int) number, fraction); break; case A_GOEND: /* * Go to line N, default end of file. */ cmd_exec(); if (number <= 0) jump_forw(); else jump_back(number); break; case A_GOEND_BUF: /* * Go to line N, default last buffered byte. */ cmd_exec(); if (number <= 0) jump_forw_buffered(); else jump_back(number); break; case A_GOPOS: /* * Go to a specified byte position in the file. */ cmd_exec(); if (number < 0) number = 0; jump_line_loc((POSITION) number, jump_sline); break; case A_STAT: /* * Print file name, etc. */ if (ch_getflags() & CH_HELPFILE) break; cmd_exec(); parg.p_string = eq_message(); error("%s", &parg); break; case A_VERSION: /* * Print version number. */ cmd_exec(); dispversion(); break; case A_QUIT: /* * Exit. */ if (curr_ifile != NULL_IFILE && ch_getflags() & CH_HELPFILE) { /* * Quit while viewing the help file * just means return to viewing the * previous file. */ hshift = save_hshift; bs_mode = save_bs_mode; proc_backspace = save_proc_backspace; if (edit_prev(1) == 0) break; } if (extra != NULL) quit(*extra); quit(QUIT_OK); break; /* * Define abbreviation for a commonly used sequence below. */ #define DO_SEARCH() \ if (number <= 0) number = 1; \ mca_search(); \ cmd_exec(); \ multi_search((char *)NULL, (int) number, 0); case A_F_SEARCH: /* * Search forward for a pattern. * Get the first char of the pattern. */ search_type = SRCH_FORW | def_search_type; if (number <= 0) number = 1; mca_search(); c = getcc(); goto again; case A_B_SEARCH: /* * Search backward for a pattern. * Get the first char of the pattern. */ search_type = SRCH_BACK | def_search_type; if (number <= 0) number = 1; mca_search(); c = getcc(); goto again; case A_FILTER: #if HILITE_SEARCH search_type = SRCH_FORW | SRCH_FILTER; mca_search(); c = getcc(); goto again; #else error("Command not available", NULL_PARG); break; #endif case A_AGAIN_SEARCH: /* * Repeat previous search. */ search_type = last_search_type; DO_SEARCH(); break; case A_T_AGAIN_SEARCH: /* * Repeat previous search, multiple files. */ search_type = last_search_type | SRCH_PAST_EOF; DO_SEARCH(); break; case A_REVERSE_SEARCH: /* * Repeat previous search, in reverse direction. */ save_search_type = search_type = last_search_type; search_type = SRCH_REVERSE(search_type); DO_SEARCH(); last_search_type = save_search_type; break; case A_T_REVERSE_SEARCH: /* * Repeat previous search, * multiple files in reverse direction. */ save_search_type = search_type = last_search_type; search_type = SRCH_REVERSE(search_type) | SRCH_PAST_EOF; DO_SEARCH(); last_search_type = save_search_type; break; case A_UNDO_SEARCH: case A_CLR_SEARCH: /* * Clear search string highlighting. */ undo_search(action == A_CLR_SEARCH); break; case A_HELP: /* * Help. */ if (ch_getflags() & CH_HELPFILE) break; cmd_exec(); save_hshift = hshift; hshift = 0; save_bs_mode = bs_mode; bs_mode = BS_SPECIAL; save_proc_backspace = proc_backspace; proc_backspace = OPT_OFF; (void) edit(FAKE_HELPFILE); break; case A_EXAMINE: /* * Edit a new file. Get the filename. */ #if EXAMINE if (!secure) { start_mca(A_EXAMINE, "Examine: ", ml_examine, 0); c = getcc(); goto again; } #endif error("Command not available", NULL_PARG); break; case A_VISUAL: /* * Invoke an editor on the input file. */ #if EDITOR if (!secure) { if (ch_getflags() & CH_HELPFILE) break; if (strcmp(get_filename(curr_ifile), "-") == 0) { error("Cannot edit standard input", NULL_PARG); break; } if (get_altfilename(curr_ifile) != NULL) { error("WARNING: This file was viewed via LESSOPEN", NULL_PARG); } start_mca(A_SHELL, "!", ml_shell, 0); /* * Expand the editor prototype string * and pass it to the system to execute. * (Make sure the screen is displayed so the * expansion of "+%lm" works.) */ make_display(); cmd_exec(); lsystem(pr_expand(editproto), (char*)NULL); break; } #endif error("Command not available", NULL_PARG); break; case A_NEXT_FILE: /* * Examine next file. */ #if TAGS if (ntags()) { error("No next file", NULL_PARG); break; } #endif if (number <= 0) number = 1; if (edit_next((int) number)) { if (get_quit_at_eof() && eof_displayed() && !(ch_getflags() & CH_HELPFILE)) quit(QUIT_OK); parg.p_string = (number > 1) ? "(N-th) " : ""; error("No %snext file", &parg); } break; case A_PREV_FILE: /* * Examine previous file. */ #if TAGS if (ntags()) { error("No previous file", NULL_PARG); break; } #endif if (number <= 0) number = 1; if (edit_prev((int) number)) { parg.p_string = (number > 1) ? "(N-th) " : ""; error("No %sprevious file", &parg); } break; case A_NEXT_TAG: /* * Jump to the next tag in the current tag list. */ #if TAGS if (number <= 0) number = 1; tagfile = nexttag((int) number); if (tagfile == NULL) { error("No next tag", NULL_PARG); break; } cmd_exec(); if (edit(tagfile) == 0) { POSITION pos = tagsearch(); if (pos != NULL_POSITION) jump_loc(pos, jump_sline); } #else error("Command not available", NULL_PARG); #endif break; case A_PREV_TAG: /* * Jump to the previous tag in the current tag list. */ #if TAGS if (number <= 0) number = 1; tagfile = prevtag((int) number); if (tagfile == NULL) { error("No previous tag", NULL_PARG); break; } cmd_exec(); if (edit(tagfile) == 0) { POSITION pos = tagsearch(); if (pos != NULL_POSITION) jump_loc(pos, jump_sline); } #else error("Command not available", NULL_PARG); #endif break; case A_INDEX_FILE: /* * Examine a particular file. */ if (number <= 0) number = 1; if (edit_index((int) number)) error("No such file", NULL_PARG); break; case A_REMOVE_FILE: /* * Remove a file from the input file list. */ if (ch_getflags() & CH_HELPFILE) break; old_ifile = curr_ifile; new_ifile = getoff_ifile(curr_ifile); if (new_ifile == NULL_IFILE) { bell(); break; } if (edit_ifile(new_ifile) != 0) { reedit_ifile(old_ifile); break; } del_ifile(old_ifile); break; case A_OPT_TOGGLE: /* * Change the setting of an option. */ optflag = OPT_TOGGLE; optgetname = FALSE; mca_opt_toggle(); c = getcc(); cbuf = opt_toggle_disallowed(c); if (cbuf != NULL) { error(cbuf, NULL_PARG); break; } goto again; case A_DISP_OPTION: /* * Report the setting of an option. */ optflag = OPT_NO_TOGGLE; optgetname = FALSE; mca_opt_toggle(); c = getcc(); goto again; case A_FIRSTCMD: /* * Set an initial command for new files. */ start_mca(A_FIRSTCMD, "+", (void*)NULL, 0); c = getcc(); goto again; case A_SHELL: case A_PSHELL: /* * Shell escape. */ #if SHELL_ESCAPE if (!secure) { start_mca(action, (action == A_SHELL) ? "!" : "#", ml_shell, 0); c = getcc(); goto again; } #endif error("Command not available", NULL_PARG); break; case A_SETMARK: case A_SETMARKBOT: /* * Set a mark. */ if (ch_getflags() & CH_HELPFILE) break; start_mca(A_SETMARK, "set mark: ", (void*)NULL, 0); c = getcc(); if (is_erase_char(c) || is_newline_char(c)) break; setmark(c, action == A_SETMARKBOT ? BOTTOM : TOP); repaint(); break; case A_CLRMARK: /* * Clear a mark. */ start_mca(A_CLRMARK, "clear mark: ", (void*)NULL, 0); c = getcc(); if (is_erase_char(c) || is_newline_char(c)) break; clrmark(c); repaint(); break; case A_GOMARK: /* * Jump to a marked position. */ start_mca(A_GOMARK, "goto mark: ", (void*)NULL, 0); c = getcc(); if (is_erase_char(c) || is_newline_char(c)) break; cmd_exec(); gomark(c); break; case A_PIPE: /* * Write part of the input to a pipe to a shell command. */ #if PIPEC if (!secure) { start_mca(A_PIPE, "|mark: ", (void*)NULL, 0); c = getcc(); if (is_erase_char(c)) break; if (is_newline_char(c)) c = '.'; if (badmark(c)) break; pipec = c; start_mca(A_PIPE, "!", ml_shell, 0); c = getcc(); goto again; } #endif error("Command not available", NULL_PARG); break; case A_B_BRACKET: case A_F_BRACKET: start_mca(action, "Brackets: ", (void*)NULL, 0); c = getcc(); goto again; case A_LSHIFT: /* * Shift view left. */ if (number > 0) shift_count = number; else number = (shift_count > 0) ? shift_count : sc_width / 2; if (number > hshift) number = hshift; hshift -= number; screen_trashed = 1; break; case A_RSHIFT: /* * Shift view right. */ if (number > 0) shift_count = number; else number = (shift_count > 0) ? shift_count : sc_width / 2; hshift += number; screen_trashed = 1; break; case A_LLSHIFT: /* * Shift view left to margin. */ hshift = 0; screen_trashed = 1; break; case A_RRSHIFT: /* * Shift view right to view rightmost char on screen. */ hshift = rrshift(); screen_trashed = 1; break; case A_PREFIX: /* * The command is incomplete (more chars are needed). * Display the current char, so the user knows * what's going on, and get another character. */ if (mca != A_PREFIX) { cmd_reset(); start_mca(A_PREFIX, " ", (void*)NULL, CF_QUIT_ON_ERASE); (void) cmd_char(c); } c = getcc(); goto again; case A_NOACTION: break; default: bell(); break; } } } diff --git a/contrib/less/edit.c b/contrib/less/edit.c index 1896694456e5..3ca5e4cc7d31 100644 --- a/contrib/less/edit.c +++ b/contrib/less/edit.c @@ -1,1017 +1,1017 @@ /* * Copyright (C) 1984-2023 Mark Nudelman * * You may distribute under the terms of either the GNU General Public * License or the Less License, as specified in the README file. * * For more information, see the README file. */ #include "less.h" #include "position.h" #if HAVE_STAT #include #endif #if HAVE_SYS_WAIT_H #include #endif #include public int fd0 = 0; extern int new_file; extern int cbufs; extern char *every_first_cmd; extern int force_open; extern int is_tty; extern int sigs; extern int hshift; extern int want_filesize; extern int consecutive_nulls; extern int modelines; extern int show_preproc_error; extern IFILE curr_ifile; extern IFILE old_ifile; extern struct scrpos initial_scrpos; extern void *ml_examine; #if SPACES_IN_FILENAMES extern char openquote; extern char closequote; #endif #if LOGFILE extern int logfile; extern int force_logfile; extern char *namelogfile; #endif #if HAVE_STAT_INO public dev_t curr_dev; public ino_t curr_ino; #endif /* * Textlist functions deal with a list of words separated by spaces. * init_textlist sets up a textlist structure. * forw_textlist uses that structure to iterate thru the list of * words, returning each one as a standard null-terminated string. * back_textlist does the same, but runs thru the list backwards. */ public void init_textlist(struct textlist *tlist, char *str) { char *s; #if SPACES_IN_FILENAMES int meta_quoted = 0; int delim_quoted = 0; char *esc = get_meta_escape(); int esclen = (int) strlen(esc); #endif tlist->string = skipsp(str); tlist->endstring = tlist->string + strlen(tlist->string); for (s = str; s < tlist->endstring; s++) { #if SPACES_IN_FILENAMES if (meta_quoted) { meta_quoted = 0; } else if (esclen > 0 && s + esclen < tlist->endstring && strncmp(s, esc, esclen) == 0) { meta_quoted = 1; s += esclen - 1; } else if (delim_quoted) { if (*s == closequote) delim_quoted = 0; } else /* (!delim_quoted) */ { if (*s == openquote) delim_quoted = 1; else if (*s == ' ') *s = '\0'; } #else if (*s == ' ') *s = '\0'; #endif } } public char * forw_textlist(struct textlist *tlist, char *prev) { char *s; /* * prev == NULL means return the first word in the list. * Otherwise, return the word after "prev". */ if (prev == NULL) s = tlist->string; else s = prev + strlen(prev); if (s >= tlist->endstring) return (NULL); while (*s == '\0') s++; if (s >= tlist->endstring) return (NULL); return (s); } public char * back_textlist(struct textlist *tlist, char *prev) { char *s; /* * prev == NULL means return the last word in the list. * Otherwise, return the word before "prev". */ if (prev == NULL) s = tlist->endstring; else if (prev <= tlist->string) return (NULL); else s = prev - 1; while (*s == '\0') s--; if (s <= tlist->string) return (NULL); while (s[-1] != '\0' && s > tlist->string) s--; return (s); } /* * Parse a single option setting in a modeline. */ static void modeline_option(char *str, int opt_len) { struct mloption { char *opt_name; void (*opt_func)(char*,int); }; struct mloption options[] = { { "ts=", set_tabs }, { "tabstop=", set_tabs }, { NULL, NULL } }; struct mloption *opt; for (opt = options; opt->opt_name != NULL; opt++) { int name_len = strlen(opt->opt_name); if (opt_len > name_len && strncmp(str, opt->opt_name, name_len) == 0) { (*opt->opt_func)(str + name_len, opt_len - name_len); break; } } } /* * String length, terminated by option separator (space or colon). * Space/colon can be escaped with backspace. */ static int modeline_option_len(char *str) { int esc = FALSE; char *s; for (s = str; *s != '\0'; s++) { if (esc) esc = FALSE; else if (*s == '\\') esc = TRUE; else if (*s == ' ' || *s == ':') /* separator */ break; } return (s - str); } /* * Parse colon- or space-separated option settings in a modeline. */ static void modeline_options(char *str, char end_char) { for (;;) { int opt_len; str = skipsp(str); if (*str == '\0' || *str == end_char) break; opt_len = modeline_option_len(str); modeline_option(str, opt_len); str += opt_len; if (*str != '\0') str += 1; /* skip past the separator */ } } /* * See if there is a modeline string in a line. */ static void check_modeline(char *line) { #if HAVE_STRSTR static char *pgms[] = { "less:", "vim:", "vi:", "ex:", NULL }; char **pgm; for (pgm = pgms; *pgm != NULL; ++pgm) { char *pline = line; for (;;) { char *str; pline = strstr(pline, *pgm); if (pline == NULL) /* pgm is not in this line */ break; str = skipsp(pline + strlen(*pgm)); if (pline == line || pline[-1] == ' ') { if (strncmp(str, "set ", 4) == 0) modeline_options(str+4, ':'); else if (pgm != &pgms[0]) /* "less:" requires "set" */ modeline_options(str, '\0'); break; } /* Continue searching the rest of the line. */ pline = str; } } #endif /* HAVE_STRSTR */ } /* * Read lines from start of file and check if any are modelines. */ static void check_modelines(void) { POSITION pos = ch_zero(); int i; for (i = 0; i < modelines; i++) { char *line; int line_len; if (ABORT_SIGS()) return; pos = forw_raw_line(pos, &line, &line_len); if (pos == NULL_POSITION) break; check_modeline(line); } } /* * Close a pipe opened via popen. */ static void close_pipe(FILE *pipefd) { int status; PARG parg; if (pipefd == NULL) return; #if OS2 /* * The pclose function of OS/2 emx sometimes fails. * Send SIGINT to the piped process before closing it. */ kill(pipefd->_pid, SIGINT); #endif status = pclose(pipefd); if (status == -1) { /* An internal error in 'less', not a preprocessor error. */ parg.p_string = errno_message("pclose"); error("%s", &parg); free(parg.p_string); return; } if (!show_preproc_error) return; #if defined WIFEXITED && defined WEXITSTATUS if (WIFEXITED(status)) { int s = WEXITSTATUS(status); if (s != 0) { parg.p_int = s; error("Input preprocessor failed (status %d)", &parg); } return; } #endif #if defined WIFSIGNALED && defined WTERMSIG && HAVE_STRSIGNAL if (WIFSIGNALED(status)) { int sig = WTERMSIG(status); if (sig != SIGPIPE || ch_length() != NULL_POSITION) { parg.p_string = signal_message(sig); error("Input preprocessor terminated: %s", &parg); } return; } #endif if (status != 0) { parg.p_int = status; error("Input preprocessor exited with status %x", &parg); } } /* * Drain and close an input pipe if needed. */ public void close_altpipe(IFILE ifile) { FILE *altpipe = get_altpipe(ifile); if (altpipe != NULL && !(ch_getflags() & CH_KEEPOPEN)) { close_pipe(altpipe); set_altpipe(ifile, NULL); } } /* * Check for error status from the current altpipe. * May or may not close the pipe. */ public void check_altpipe_error(void) { if (!show_preproc_error) return; if (curr_ifile != NULL_IFILE && get_altfilename(curr_ifile) != NULL) close_altpipe(curr_ifile); } /* * Close the current input file. */ static void close_file(void) { struct scrpos scrpos; char *altfilename; if (curr_ifile == NULL_IFILE) return; /* * Save the current position so that we can return to * the same position if we edit this file again. */ get_scrpos(&scrpos, TOP); if (scrpos.pos != NULL_POSITION) { store_pos(curr_ifile, &scrpos); lastmark(); } /* * Close the file descriptor, unless it is a pipe. */ ch_close(); /* * If we opened a file using an alternate name, * do special stuff to close it. */ altfilename = get_altfilename(curr_ifile); if (altfilename != NULL) { close_altpipe(curr_ifile); close_altfile(altfilename, get_filename(curr_ifile)); set_altfilename(curr_ifile, NULL); } curr_ifile = NULL_IFILE; #if HAVE_STAT_INO curr_ino = curr_dev = 0; #endif } /* * Edit a new file (given its name). * Filename == "-" means standard input. * Filename == NULL means just close the current file. */ public int edit(char *filename) { if (filename == NULL) return (edit_ifile(NULL_IFILE)); return (edit_ifile(get_ifile(filename, curr_ifile))); } /* * Clean up what edit_ifile did before error return. */ static int edit_error(char *filename, char *alt_filename, void *altpipe, IFILE ifile, IFILE was_curr_ifile) { if (alt_filename != NULL) { close_pipe(altpipe); close_altfile(alt_filename, filename); free(alt_filename); } del_ifile(ifile); free(filename); /* * Re-open the current file. */ if (was_curr_ifile == ifile) { /* * Whoops. The "current" ifile is the one we just deleted. * Just give up. */ quit(QUIT_ERROR); } reedit_ifile(was_curr_ifile); return (1); } /* * Edit a new file (given its IFILE). * ifile == NULL means just close the current file. */ public int edit_ifile(IFILE ifile) { int f; int answer; int chflags; char *filename; char *open_filename; char *alt_filename; void *altpipe; IFILE was_curr_ifile; PARG parg; if (ifile == curr_ifile) { /* * Already have the correct file open. */ return (0); } /* * We must close the currently open file now. * This is necessary to make the open_altfile/close_altfile pairs * nest properly (or rather to avoid nesting at all). * {{ Some stupid implementations of popen() mess up if you do: * fA = popen("A"); fB = popen("B"); pclose(fA); pclose(fB); }} */ #if LOGFILE end_logfile(); #endif was_curr_ifile = save_curr_ifile(); if (curr_ifile != NULL_IFILE) { chflags = ch_getflags(); close_file(); if ((chflags & CH_HELPFILE) && held_ifile(was_curr_ifile) <= 1) { /* * Don't keep the help file in the ifile list. */ del_ifile(was_curr_ifile); was_curr_ifile = old_ifile; } } if (ifile == NULL_IFILE) { /* * No new file to open. * (Don't set old_ifile, because if you call edit_ifile(NULL), * you're supposed to have saved curr_ifile yourself, * and you'll restore it if necessary.) */ unsave_ifile(was_curr_ifile); return (0); } filename = save(get_filename(ifile)); /* * See if LESSOPEN specifies an "alternate" file to open. */ altpipe = get_altpipe(ifile); if (altpipe != NULL) { /* * File is already open. * chflags and f are not used by ch_init if ifile has * filestate which should be the case if we're here. * Set them here to avoid uninitialized variable warnings. */ chflags = 0; f = -1; alt_filename = get_altfilename(ifile); open_filename = (alt_filename != NULL) ? alt_filename : filename; } else { if (strcmp(filename, FAKE_HELPFILE) == 0 || strcmp(filename, FAKE_EMPTYFILE) == 0) alt_filename = NULL; else alt_filename = open_altfile(filename, &f, &altpipe); open_filename = (alt_filename != NULL) ? alt_filename : filename; chflags = 0; if (altpipe != NULL) { /* * The alternate "file" is actually a pipe. * f has already been set to the file descriptor of the pipe * in the call to open_altfile above. * Keep the file descriptor open because it was opened * via popen(), and pclose() wants to close it. */ chflags |= CH_POPENED; if (strcmp(filename, "-") == 0) chflags |= CH_KEEPOPEN; } else if (strcmp(filename, "-") == 0) { /* * Use standard input. * Keep the file descriptor open because we can't reopen it. */ f = fd0; chflags |= CH_KEEPOPEN; /* * Must switch stdin to BINARY mode. */ SET_BINARY(f); #if MSDOS_COMPILER==DJGPPC /* * Setting stdin to binary by default causes * Ctrl-C to not raise SIGINT. We must undo * that side-effect. */ __djgpp_set_ctrl_c(1); #endif } else if (strcmp(open_filename, FAKE_EMPTYFILE) == 0) { f = -1; chflags |= CH_NODATA; } else if (strcmp(open_filename, FAKE_HELPFILE) == 0) { f = -1; chflags |= CH_HELPFILE; } else if ((parg.p_string = bad_file(open_filename)) != NULL) { /* * It looks like a bad file. Don't try to open it. */ error("%s", &parg); free(parg.p_string); return edit_error(filename, alt_filename, altpipe, ifile, was_curr_ifile); } else if ((f = open(open_filename, OPEN_READ)) < 0) { /* * Got an error trying to open it. */ parg.p_string = errno_message(filename); error("%s", &parg); free(parg.p_string); return edit_error(filename, alt_filename, altpipe, ifile, was_curr_ifile); } else { chflags |= CH_CANSEEK; if (!force_open && !opened(ifile) && bin_file(f)) { /* * Looks like a binary file. * Ask user if we should proceed. */ parg.p_string = filename; answer = query("\"%s\" may be a binary file. See it anyway? ", &parg); if (answer != 'y' && answer != 'Y') { close(f); return edit_error(filename, alt_filename, altpipe, ifile, was_curr_ifile); } } } } if (!force_open && f >= 0 && isatty(f)) { PARG parg; parg.p_string = filename; error("%s is a terminal (use -f to open it)", &parg); return edit_error(filename, alt_filename, altpipe, ifile, was_curr_ifile); } /* * Get the new ifile. * Get the saved position for the file. */ if (was_curr_ifile != NULL_IFILE) { old_ifile = was_curr_ifile; unsave_ifile(was_curr_ifile); } curr_ifile = ifile; set_altfilename(curr_ifile, alt_filename); set_altpipe(curr_ifile, altpipe); set_open(curr_ifile); /* File has been opened */ get_pos(curr_ifile, &initial_scrpos); new_file = TRUE; ch_init(f, chflags); consecutive_nulls = 0; check_modelines(); if (!(chflags & CH_HELPFILE)) { #if LOGFILE if (namelogfile != NULL && is_tty) use_logfile(namelogfile); #endif #if HAVE_STAT_INO /* Remember the i-number and device of the opened file. */ if (strcmp(open_filename, "-") != 0) { struct stat statbuf; int r = stat(open_filename, &statbuf); if (r == 0) { curr_ino = statbuf.st_ino; curr_dev = statbuf.st_dev; } } #endif if (every_first_cmd != NULL) { ungetsc(every_first_cmd); ungetcc_back(CHAR_END_COMMAND); } } flush(); if (is_tty) { /* * Output is to a real tty. */ /* * Indicate there is nothing displayed yet. */ pos_clear(); clr_linenum(); #if HILITE_SEARCH clr_hilite(); #endif hshift = 0; if (strcmp(filename, FAKE_HELPFILE) && strcmp(filename, FAKE_EMPTYFILE)) { char *qfilename = shell_quote(filename); cmd_addhist(ml_examine, qfilename, 1); free(qfilename); } if (want_filesize) scan_eof(); } free(filename); return (0); } /* * Edit a space-separated list of files. * For each filename in the list, enter it into the ifile list. * Then edit the first one. */ public int edit_list(char *filelist) { IFILE save_ifile; char *good_filename; char *filename; char *gfilelist; char *gfilename; char *qfilename; struct textlist tl_files; struct textlist tl_gfiles; save_ifile = save_curr_ifile(); good_filename = NULL; /* * Run thru each filename in the list. * Try to glob the filename. * If it doesn't expand, just try to open the filename. * If it does expand, try to open each name in that list. */ init_textlist(&tl_files, filelist); filename = NULL; while ((filename = forw_textlist(&tl_files, filename)) != NULL) { gfilelist = lglob(filename); init_textlist(&tl_gfiles, gfilelist); gfilename = NULL; while ((gfilename = forw_textlist(&tl_gfiles, gfilename)) != NULL) { qfilename = shell_unquote(gfilename); if (edit(qfilename) == 0 && good_filename == NULL) good_filename = get_filename(curr_ifile); free(qfilename); } free(gfilelist); } /* * Edit the first valid filename in the list. */ if (good_filename == NULL) { unsave_ifile(save_ifile); return (1); } if (get_ifile(good_filename, curr_ifile) == curr_ifile) { /* * Trying to edit the current file; don't reopen it. */ unsave_ifile(save_ifile); return (0); } reedit_ifile(save_ifile); return (edit(good_filename)); } /* * Edit the first file in the command line (ifile) list. */ public int edit_first(void) { if (nifile() == 0) return (edit_stdin()); curr_ifile = NULL_IFILE; return (edit_next(1)); } /* * Edit the last file in the command line (ifile) list. */ public int edit_last(void) { curr_ifile = NULL_IFILE; return (edit_prev(1)); } /* * Edit the n-th next or previous file in the command line (ifile) list. */ static int edit_istep(IFILE h, int n, int dir) { IFILE next; /* * Skip n filenames, then try to edit each filename. */ for (;;) { next = (dir > 0) ? next_ifile(h) : prev_ifile(h); if (--n < 0) { if (edit_ifile(h) == 0) break; } if (next == NULL_IFILE) { /* * Reached end of the ifile list. */ return (1); } if (ABORT_SIGS()) { /* * Interrupt breaks out, if we're in a long * list of files that can't be opened. */ return (1); } h = next; } /* * Found a file that we can edit. */ return (0); } static int edit_inext(IFILE h, int n) { return (edit_istep(h, n, +1)); } public int edit_next(int n) { return edit_istep(curr_ifile, n, +1); } static int edit_iprev(IFILE h, int n) { return (edit_istep(h, n, -1)); } public int edit_prev(int n) { return edit_istep(curr_ifile, n, -1); } /* * Edit a specific file in the command line (ifile) list. */ public int edit_index(int n) { IFILE h; h = NULL_IFILE; do { if ((h = next_ifile(h)) == NULL_IFILE) { /* * Reached end of the list without finding it. */ return (1); } } while (get_index(h) != n); return (edit_ifile(h)); } public IFILE save_curr_ifile(void) { if (curr_ifile != NULL_IFILE) hold_ifile(curr_ifile, 1); return (curr_ifile); } public void unsave_ifile(IFILE save_ifile) { if (save_ifile != NULL_IFILE) hold_ifile(save_ifile, -1); } /* * Reedit the ifile which was previously open. */ public void reedit_ifile(IFILE save_ifile) { IFILE next; IFILE prev; /* * Try to reopen the ifile. * Note that opening it may fail (maybe the file was removed), * in which case the ifile will be deleted from the list. * So save the next and prev ifiles first. */ unsave_ifile(save_ifile); next = next_ifile(save_ifile); prev = prev_ifile(save_ifile); if (edit_ifile(save_ifile) == 0) return; /* * If can't reopen it, open the next input file in the list. */ if (next != NULL_IFILE && edit_inext(next, 0) == 0) return; /* * If can't open THAT one, open the previous input file in the list. */ if (prev != NULL_IFILE && edit_iprev(prev, 0) == 0) return; /* * If can't even open that, we're stuck. Just quit. */ quit(QUIT_ERROR); } public void reopen_curr_ifile(void) { IFILE save_ifile = save_curr_ifile(); close_file(); reedit_ifile(save_ifile); } /* * Edit standard input. */ public int edit_stdin(void) { if (isatty(fd0)) { error("Missing filename (\"less --help\" for help)", NULL_PARG); quit(QUIT_OK); } return (edit("-")); } /* * Copy a file directly to standard output. * Used if standard output is not a tty. */ public void cat_file(void) { int c; while ((c = ch_forw_get()) != EOI) putchr(c); flush(); } #if LOGFILE #define OVERWRITE_OPTIONS "Overwrite, Append, Don't log, or Quit?" /* * If the user asked for a log file and our input file * is standard input, create the log file. * We take care not to blindly overwrite an existing file. */ public void use_logfile(char *filename) { int exists; int answer; PARG parg; if (ch_getflags() & CH_CANSEEK) /* * Can't currently use a log file on a file that can seek. */ return; /* * {{ We could use access() here. }} */ exists = open(filename, OPEN_READ); if (exists >= 0) close(exists); exists = (exists >= 0); /* * Decide whether to overwrite the log file or append to it. * If it doesn't exist we "overwrite" it. */ if (!exists || force_logfile) { /* * Overwrite (or create) the log file. */ answer = 'O'; } else { /* * Ask user what to do. */ parg.p_string = filename; answer = query("Warning: \"%s\" exists; "OVERWRITE_OPTIONS" ", &parg); } loop: switch (answer) { case 'O': case 'o': /* * Overwrite: create the file. */ - logfile = creat(filename, 0644); + logfile = creat(filename, CREAT_RW); break; case 'A': case 'a': /* * Append: open the file and seek to the end. */ logfile = open(filename, OPEN_APPEND); if (lseek(logfile, (off_t)0, SEEK_END) == BAD_LSEEK) { close(logfile); logfile = -1; } break; case 'D': case 'd': /* * Don't do anything. */ return; default: /* * Eh? */ answer = query(OVERWRITE_OPTIONS" (Type \"O\", \"A\", \"D\" or \"Q\") ", NULL_PARG); goto loop; } if (logfile < 0) { /* * Error in opening logfile. */ parg.p_string = filename; error("Cannot write to \"%s\"", &parg); return; } SET_BINARY(logfile); } #endif diff --git a/contrib/less/forwback.c b/contrib/less/forwback.c index 6faec94d225b..b020fe5d85eb 100644 --- a/contrib/less/forwback.c +++ b/contrib/less/forwback.c @@ -1,554 +1,554 @@ /* * Copyright (C) 1984-2023 Mark Nudelman * * You may distribute under the terms of either the GNU General Public * License or the Less License, as specified in the README file. * * For more information, see the README file. */ /* * Primitives for displaying the file on the screen, * scrolling either forward or backward. */ #include "less.h" #include "position.h" extern int less_is_more; public int screen_trashed; public int squished; public int no_back_scroll = 0; public int forw_prompt; public int first_time = 1; extern int sigs; extern int top_scroll; extern int quiet; extern int sc_width, sc_height; extern int hshift; extern int auto_wrap; extern int plusoption; extern int forw_scroll; extern int back_scroll; extern int ignore_eoi; extern int clear_bg; extern int final_attr; extern int header_lines; extern int header_cols; extern int full_screen; #if HILITE_SEARCH extern int size_linebuf; extern int hilite_search; extern int status_col; #endif #if TAGS extern char *tagoption; #endif /* * Sound the bell to indicate user is trying to move past end of file. */ public void eof_bell(void) { #if HAVE_TIME static time_type last_eof_bell = 0; time_type now = get_time(); if (now == last_eof_bell) /* max once per second */ return; last_eof_bell = now; #endif if (quiet == NOT_QUIET) bell(); else vbell(); } /* * Check to see if the end of file is currently displayed. */ public int eof_displayed(void) { POSITION pos; if (ignore_eoi) return (0); if (ch_length() == NULL_POSITION) /* * If the file length is not known, * we can't possibly be displaying EOF. */ return (0); /* * If the bottom line is empty, we are at EOF. * If the bottom line ends at the file length, * we must be just at EOF. */ pos = position(BOTTOM_PLUS_ONE); return (pos == NULL_POSITION || pos == ch_length()); } /* * Check to see if the entire file is currently displayed. */ public int entire_file_displayed(void) { POSITION pos; /* Make sure last line of file is displayed. */ if (!eof_displayed()) return (0); /* Make sure first line of file is displayed. */ pos = position(0); return (pos == NULL_POSITION || pos == 0); } /* * If the screen is "squished", repaint it. * "Squished" means the first displayed line is not at the top * of the screen; this can happen when we display a short file * for the first time. */ public void squish_check(void) { if (!squished) return; squished = 0; repaint(); } /* * Read the first pfx columns of the next line. * If skipeol==0 stop there, otherwise read and discard chars to end of line. */ static POSITION forw_line_pfx(POSITION pos, int pfx, int skipeol) { int save_sc_width = sc_width; int save_auto_wrap = auto_wrap; int save_hshift = hshift; /* Set fake sc_width to force only pfx chars to be read. */ sc_width = pfx + line_pfx_width(); auto_wrap = 0; hshift = 0; pos = forw_line_seg(pos, skipeol, FALSE, FALSE); sc_width = save_sc_width; auto_wrap = save_auto_wrap; hshift = save_hshift; return pos; } /* * Set header text color. * Underline last line of headers, but not at beginning of file * (where there is no gap between the last header line and the next line). */ static void set_attr_header(int ln) { set_attr_line(AT_COLOR_HEADER); if (ln+1 == header_lines && position(0) != ch_zero()) set_attr_line(AT_UNDERLINE); } /* * Display file headers, overlaying text already drawn * at top and left of screen. */ public int overlay_header(void) { POSITION pos = ch_zero(); /* header lines are at beginning of file */ int ln; int moved = FALSE; if (header_lines > 0) { /* Draw header_lines lines from start of file at top of screen. */ home(); for (ln = 0; ln < header_lines; ++ln) { pos = forw_line(pos); set_attr_header(ln); clear_eol(); put_line(); } moved = TRUE; } if (header_cols > 0) { /* Draw header_cols columns at left of each line. */ home(); pos = ch_zero(); for (ln = 0; ln < sc_height-1; ++ln) { if (ln >= header_lines) /* switch from header lines to normal lines */ pos = position(ln); if (pos == NULL_POSITION) putchr('\n'); else { /* Need skipeol for all header lines except the last one. */ pos = forw_line_pfx(pos, header_cols, ln+1 < header_lines); set_attr_header(ln); put_line(); } } moved = TRUE; } if (moved) lower_left(); return moved; } /* * Display n lines, scrolling forward, * starting at position pos in the input file. * "force" means display the n lines even if we hit end of file. * "only_last" means display only the last screenful if n > screen size. * "nblank" is the number of blank lines to draw before the first * real line. If nblank > 0, the pos must be NULL_POSITION. * The first real line after the blanks will start at ch_zero(). */ public void forw(int n, POSITION pos, int force, int only_last, int nblank) { int nlines = 0; int do_repaint; squish_check(); /* * do_repaint tells us not to display anything till the end, * then just repaint the entire screen. * We repaint if we are supposed to display only the last * screenful and the request is for more than a screenful. * Also if the request exceeds the forward scroll limit * (but not if the request is for exactly a screenful, since * repainting itself involves scrolling forward a screenful). */ do_repaint = (only_last && n > sc_height-1) || (forw_scroll >= 0 && n > forw_scroll && n != sc_height-1); #if HILITE_SEARCH - if (hilite_search == OPT_ONPLUS || is_filtering() || status_col) { + if (pos != NULL_POSITION && (hilite_search == OPT_ONPLUS || is_filtering() || status_col)) { prep_hilite(pos, pos + 4*size_linebuf, ignore_eoi ? 1 : -1); pos = next_unfiltered(pos); } #endif if (!do_repaint) { if (top_scroll && n >= sc_height - 1 && pos != ch_length()) { /* * Start a new screen. * {{ This is not really desirable if we happen * to hit eof in the middle of this screen, * but we don't yet know if that will happen. }} */ pos_clear(); add_forw_pos(pos); force = 1; if (less_is_more == 0) { clear(); home(); } } if (pos != position(BOTTOM_PLUS_ONE) || empty_screen()) { /* * This is not contiguous with what is * currently displayed. Clear the screen image * (position table) and start a new screen. */ pos_clear(); add_forw_pos(pos); force = 1; if (top_scroll) { clear(); home(); } else if (!first_time && !is_filtering() && full_screen) { putstr("...skipping...\n"); } } } while (--n >= 0) { /* * Read the next line of input. */ if (nblank > 0) { /* * Still drawing blanks; don't get a line * from the file yet. * If this is the last blank line, get ready to * read a line starting at ch_zero() next time. */ if (--nblank == 0) pos = ch_zero(); } else { /* * Get the next line from the file. */ pos = forw_line(pos); #if HILITE_SEARCH pos = next_unfiltered(pos); #endif if (pos == NULL_POSITION) { /* * End of file: stop here unless the top line * is still empty, or "force" is true. * Even if force is true, stop when the last * line in the file reaches the top of screen. */ if (!force && position(TOP) != NULL_POSITION) break; if (!empty_lines(0, 0) && !empty_lines(1, 1) && empty_lines(2, sc_height-1)) break; } } /* * Add the position of the next line to the position table. * Display the current line on the screen. */ add_forw_pos(pos); nlines++; if (do_repaint) continue; /* * If this is the first screen displayed and * we hit an early EOF (i.e. before the requested * number of lines), we "squish" the display down * at the bottom of the screen. * But don't do this if a + option or a -t option * was given. These options can cause us to * start the display after the beginning of the file, * and it is not appropriate to squish in that case. */ if ((first_time || less_is_more) && pos == NULL_POSITION && !top_scroll && header_lines == 0 && header_cols == 0 && #if TAGS tagoption == NULL && #endif !plusoption) { squished = 1; continue; } put_line(); #if 0 /* {{ * Can't call clear_eol here. The cursor might be at end of line * on an ignaw terminal, so clear_eol would clear the last char * of the current line instead of all of the next line. * If we really need to do this on clear_bg terminals, we need * to find a better way. * }} */ if (clear_bg && apply_at_specials(final_attr) != AT_NORMAL) { /* * Writing the last character on the last line * of the display may have scrolled the screen. * If we were in standout mode, clear_bg terminals * will fill the new line with the standout color. * Now we're in normal mode again, so clear the line. */ clear_eol(); } #endif forw_prompt = 1; } if (header_lines > 0) { /* * Don't allow ch_zero to appear on screen except at top of screen. * Otherwise duplicate header lines may be displayed. */ if (onscreen(ch_zero()) > 0) { jump_loc(ch_zero(), 0); /* {{ yuck }} */ return; } } if (nlines == 0 && !ignore_eoi) eof_bell(); else if (do_repaint) repaint(); else { overlay_header(); /* lower_left(); {{ considered harmful? }} */ } first_time = 0; (void) currline(BOTTOM); } /* * Display n lines, scrolling backward. */ public void back(int n, POSITION pos, int force, int only_last) { int nlines = 0; int do_repaint; squish_check(); do_repaint = (n > get_back_scroll() || (only_last && n > sc_height-1) || header_lines > 0); #if HILITE_SEARCH - if (hilite_search == OPT_ONPLUS || is_filtering() || status_col) { - prep_hilite((pos < 3*size_linebuf) ? 0 : pos - 3*size_linebuf, pos, -1); + if (pos != NULL_POSITION && (hilite_search == OPT_ONPLUS || is_filtering() || status_col)) { + prep_hilite((pos < 3*size_linebuf) ? 0 : pos - 3*size_linebuf, pos, -1); } #endif while (--n >= 0) { /* * Get the previous line of input. */ #if HILITE_SEARCH pos = prev_unfiltered(pos); #endif pos = back_line(pos); if (pos == NULL_POSITION) { /* * Beginning of file: stop here unless "force" is true. */ if (!force) break; } /* * Add the position of the previous line to the position table. * Display the line on the screen. */ add_back_pos(pos); nlines++; if (!do_repaint) { home(); add_line(); put_line(); } } if (nlines == 0) eof_bell(); else if (do_repaint) repaint(); else { overlay_header(); lower_left(); } (void) currline(BOTTOM); } /* * Display n more lines, forward. * Start just after the line currently displayed at the bottom of the screen. */ public void forward(int n, int force, int only_last) { POSITION pos; if (get_quit_at_eof() && eof_displayed() && !(ch_getflags() & CH_HELPFILE)) { /* * If the -e flag is set and we're trying to go * forward from end-of-file, go on to the next file. */ if (edit_next(1)) quit(QUIT_OK); return; } pos = position(BOTTOM_PLUS_ONE); if (pos == NULL_POSITION && (!force || empty_lines(2, sc_height-1))) { if (ignore_eoi) { /* * ignore_eoi is to support A_F_FOREVER. * Back up until there is a line at the bottom * of the screen. */ if (empty_screen()) pos = ch_zero(); else { do { back(1, position(TOP), 1, 0); pos = position(BOTTOM_PLUS_ONE); - } while (pos == NULL_POSITION); + } while (pos == NULL_POSITION && !ABORT_SIGS()); } } else { eof_bell(); return; } } forw(n, pos, force, only_last, 0); } /* * Display n more lines, backward. * Start just before the line currently displayed at the top of the screen. */ public void backward(int n, int force, int only_last) { POSITION pos; pos = position(TOP); if (pos == NULL_POSITION && (!force || position(BOTTOM) == 0)) { eof_bell(); return; } back(n, pos, force, only_last); } /* * Get the backwards scroll limit. * Must call this function instead of just using the value of * back_scroll, because the default case depends on sc_height and * top_scroll, as well as back_scroll. */ public int get_back_scroll(void) { if (no_back_scroll) return (0); if (back_scroll >= 0) return (back_scroll); if (top_scroll) return (sc_height - 2); return (10000); /* infinity */ } /* * Will the entire file fit on one screen? */ public int get_one_screen(void) { int nlines; POSITION pos = ch_zero(); for (nlines = 0; nlines < sc_height; nlines++) { pos = forw_line(pos); if (pos == NULL_POSITION) break; } return (nlines < sc_height); } diff --git a/contrib/less/funcs.h b/contrib/less/funcs.h index 071e80b050a7..1c9b181c0459 100644 --- a/contrib/less/funcs.h +++ b/contrib/less/funcs.h @@ -1,384 +1,385 @@ public char * save(constant char *s); public void out_of_memory(void); public void * ecalloc(int count, unsigned int size); public char * skipsp(char *s); public int sprefix(char *ps, char *s, int uppercase); public void quit(int status); public void raw_mode(int on); public void scrsize(void); public char * special_key_str(int key); public void get_term(void); public void init_mouse(void); public void deinit_mouse(void); public void init(void); public void deinit(void); public int interactive(void); public void home(void); public void dump_screen(void); public void add_line(void); public void remove_top(int n); public void win32_scroll_up(int n); public void lower_left(void); public void line_left(void); public void check_winch(void); public void goto_line(int sindex); public void vbell(void); public void bell(void); public void clear(void); public void clear_eol(void); public void clear_bot(void); public COLOR_TYPE parse_color(char *str, int *p_fg, int *p_bg); public void at_enter(int attr); public void at_exit(void); public void at_switch(int attr); public int is_at_equiv(int attr1, int attr2); public int apply_at_specials(int attr); public void putbs(void); public int win32_kbhit(void); public char WIN32getch(void); +public void WIN32ungetch(int ch); public void WIN32setcolors(int fg, int bg); public void WIN32textout(char *text, int len); public void match_brac(char obrac, char cbrac, int forwdir, int n); public void ch_ungetchar(int c); public void end_logfile(void); public void sync_logfile(void); public int ch_seek(POSITION pos); public int ch_end_seek(void); public int ch_end_buffer_seek(void); public int ch_beg_seek(void); public POSITION ch_length(void); public POSITION ch_tell(void); public int ch_forw_get(void); public int ch_back_get(void); public void ch_setbufspace(int bufspace); public void ch_flush(void); public int seekable(int f); public void ch_set_eof(void); public void ch_init(int f, int flags); public void ch_close(void); public int ch_getflags(void); public void setfmt(char *s, char **fmtvarptr, int *attrptr, char *default_fmt, int for_printf); public void init_charset(void); public int binary_char(LWCHAR c); public int control_char(LWCHAR c); public char * prchar(LWCHAR c); public char * prutfchar(LWCHAR ch); public int utf_len(int ch); public int is_utf8_well_formed(char *ss, int slen); public void utf_skip_to_lead(char **pp, char *limit); public LWCHAR get_wchar(constant char *p); public void put_wchar(char **pp, LWCHAR ch); public LWCHAR step_char(char **pp, signed int dir, constant char *limit); public int is_composing_char(LWCHAR ch); public int is_ubin_char(LWCHAR ch); public int is_wide_char(LWCHAR ch); public int is_combining_char(LWCHAR ch1, LWCHAR ch2); public void cmd_reset(void); public void clear_cmd(void); public void cmd_putstr(constant char *s); public int len_cmdbuf(void); public void cmd_repaint(constant char *old_cp); public void set_mlist(void *mlist, int cmdflags); public void cmd_addhist(struct mlist *mlist, constant char *cmd, int modified); public void cmd_accept(void); public int cmd_char(int c); public LINENUM cmd_int(long *frac); public char * get_cmdbuf(void); public char * cmd_lastpattern(void); public void init_cmdhist(void); public void save_cmdhist(void); public int in_mca(void); public int norm_search_type(int st); public void dispversion(void); public int getcc(void); public void ungetcc(LWCHAR c); public void ungetcc_back(LWCHAR c); public void ungetsc(char *s); public LWCHAR peekcc(void); public void commands(void); public int cvt_length(int len, int ops); public int * cvt_alloc_chpos(int len); public void cvt_text(char *odst, char *osrc, int *chpos, int *lenp, int ops); public void expand_cmd_tables(void); public void init_cmds(void); public void add_fcmd_table(char *buf, int len); public void add_ecmd_table(char *buf, int len); public int fcmd_decode(char *cmd, char **sp); public int ecmd_decode(char *cmd, char **sp); public char * lgetenv(char *var); public int isnullenv(char *s); public int lesskey(char *filename, int sysvar); public int lesskey_src(char *filename, int sysvar); public int add_hometable(int (*call_lesskey)(char *, int), char *envname, char *def_filename, int sysvar); public int editchar(int c, int flags); public void init_textlist(struct textlist *tlist, char *str); public char * forw_textlist(struct textlist *tlist, char *prev); public char * back_textlist(struct textlist *tlist, char *prev); public void close_altpipe(IFILE ifile); public void check_altpipe_error(void); public int edit(char *filename); public int edit_ifile(IFILE ifile); public int edit_list(char *filelist); public int edit_first(void); public int edit_last(void); public int edit_next(int n); public int edit_prev(int n); public int edit_index(int n); public IFILE save_curr_ifile(void); public void unsave_ifile(IFILE save_ifile); public void reedit_ifile(IFILE save_ifile); public void reopen_curr_ifile(void); public int edit_stdin(void); public void cat_file(void); public void use_logfile(char *filename); public char * shell_unquote(char *str); public char * get_meta_escape(void); public char * shell_quote(char *s); public char * dirfile(char *dirname, char *filename, int must_exist); public char * homefile(char *filename); public char * fexpand(char *s); public char * fcomplete(char *s); public int bin_file(int f); public char * lglob(char *filename); public int is_fake_pathname(char *path); public char * lrealpath(char *path); public char * open_altfile(char *filename, int *pf, void **pfd); public void close_altfile(char *altfilename, char *filename); public int is_dir(char *filename); public char * bad_file(char *filename); public POSITION filesize(int f); public int curr_ifile_changed(void); public char * shell_coption(void); public char * last_component(char *name); public void eof_bell(void); public int eof_displayed(void); public int entire_file_displayed(void); public void squish_check(void); public int overlay_header(void); public void forw(int n, POSITION pos, int force, int only_last, int nblank); public void back(int n, POSITION pos, int force, int only_last); public void forward(int n, int force, int only_last); public void backward(int n, int force, int only_last); public int get_back_scroll(void); public int get_one_screen(void); public void del_ifile(IFILE h); public IFILE next_ifile(IFILE h); public IFILE prev_ifile(IFILE h); public IFILE getoff_ifile(IFILE ifile); public int nifile(void); public IFILE get_ifile(char *filename, IFILE prev); public char * get_filename(IFILE ifile); public char * get_real_filename(IFILE ifile); public int get_index(IFILE ifile); public void store_pos(IFILE ifile, struct scrpos *scrpos); public void get_pos(IFILE ifile, struct scrpos *scrpos); public void set_open(IFILE ifile); public int opened(IFILE ifile); public void hold_ifile(IFILE ifile, int incr); public int held_ifile(IFILE ifile); public void * get_filestate(IFILE ifile); public void set_filestate(IFILE ifile, void *filestate); public void set_altpipe(IFILE ifile, void *p); public void *get_altpipe(IFILE ifile); public void set_altfilename(IFILE ifile, char *altfilename); public char * get_altfilename(IFILE ifile); public void if_dump(void); public POSITION forw_line_seg(POSITION curr_pos, int skipeol, int rscroll, int nochop); public POSITION forw_line(POSITION curr_pos); public POSITION back_line(POSITION curr_pos); public void set_attnpos(POSITION pos); public void jump_forw(void); public void jump_forw_buffered(void); public void jump_back(LINENUM linenum); public void repaint(void); public void jump_percent(int percent, long fraction); public void jump_line_loc(POSITION pos, int sline); public void jump_loc(POSITION pos, int sline); public void init_line(void); public int is_ascii_char(LWCHAR ch); public POSITION line_position(void); public void prewind(void); public void plinestart(POSITION pos); public int line_pfx_width(void); public void pshift_all(void); public int pwidth(LWCHAR ch, int a, LWCHAR prev_ch, int prev_a); public void savec(void); public void loadc(void); public int is_ansi_end(LWCHAR ch); public int is_ansi_middle(LWCHAR ch); public void skip_ansi(struct ansi_state *pansi, char **pp, constant char *limit); public struct ansi_state * ansi_start(LWCHAR ch); public int ansi_step(struct ansi_state *pansi, LWCHAR ch); public void ansi_done(struct ansi_state *pansi); public int pappend(int c, POSITION pos); public int pflushmbc(void); public void pdone(int endline, int chopped, int forw); public void set_attr_line(int a); public void set_status_col(char c, int attr); public int gline(int i, int *ap); public void null_line(void); public POSITION forw_raw_line(POSITION curr_pos, char **linep, int *line_lenp); public POSITION back_raw_line(POSITION curr_pos, char **linep, int *line_lenp); public int skip_columns(int cols, char **linep, int *line_lenp); public void load_line(constant char *str); public int rrshift(void); public int set_color_map(int attr, char *colorstr); public char * get_color_map(int attr); public void clr_linenum(void); public void add_lnum(LINENUM linenum, POSITION pos); public LINENUM find_linenum(POSITION pos); public POSITION find_pos(LINENUM linenum); public LINENUM currline(int where); public void scan_eof(void); public LINENUM vlinenum(LINENUM linenum); public void lsystem(char *cmd, char *donemsg); public int pipe_mark(int c, char *cmd); public int pipe_data(char *cmd, POSITION spos, POSITION epos); public void init_mark(void); public int badmark(LWCHAR c); public void setmark(LWCHAR c, int where); public void clrmark(LWCHAR c); public void lastmark(void); public void gomark(LWCHAR c); public POSITION markpos(LWCHAR c); public char posmark(POSITION pos); public void unmark(IFILE ifile); public void mark_check_ifile(IFILE ifile); public void save_marks(FILE *fout, char *hdr); public void restore_mark(char *line); public void opt_o(int type, char *s); public void opt__O(int type, char *s); public void opt_j(int type, char *s); public void calc_jump_sline(void); public void opt_shift(int type, char *s); public void calc_shift_count(void); public void opt_k(int type, char *s); public void opt_ks(int type, char *s); public void opt_t(int type, char *s); public void opt__T(int type, char *s); public void opt_p(int type, char *s); public void opt__P(int type, char *s); public void opt_b(int type, char *s); public void opt_i(int type, char *s); public void opt__V(int type, char *s); public void opt_D(int type, char *s); public void set_tabs(char *s, int len); public void opt_x(int type, char *s); public void opt_quote(int type, char *s); public void opt_rscroll(int type, char *s); public void opt_query(int type, char *s); public void opt_mousecap(int type, char *s); public void opt_wheel_lines(int type, char *s); public void opt_linenum_width(int type, char *s); public void opt_status_col_width(int type, char *s); public void opt_filesize(int type, char *s); public void opt_intr(int type, char *s); public void opt_header(int type, char *s); public void opt_search_type(int type, char *s); public void opt_ttyin_name(int type, char *s); public int chop_line(void); public int get_swindow(void); public char * propt(int c); public void scan_option(char *s); public void toggle_option(struct loption *o, int lower, char *s, int how_toggle); public int opt_has_param(struct loption *o); public char * opt_prompt(struct loption *o); public char * opt_toggle_disallowed(int c); public int isoptpending(void); public void nopendopt(void); public int getnum(char **sp, char *printopt, int *errp); public long getfraction(char **sp, char *printopt, int *errp); public int get_quit_at_eof(void); public void init_option(void); public struct loption * findopt(int c); public struct loption * findopt_name(char **p_optname, char **p_oname, int *p_err); public void init_poll(void); public int supports_ctrl_x(void); public int iread(int fd, unsigned char *buf, unsigned int len); public void intread(void); public time_type get_time(void); public char * errno_message(char *filename); public char * signal_message(int sig); public uintmax muldiv(uintmax val, uintmax num, uintmax den); public int percentage(POSITION num, POSITION den); public POSITION percent_pos(POSITION pos, int percent, long fraction); public int os9_signal(int type, RETSIGTYPE (*handler)()); public void sleep_ms(int ms); public void put_line(void); public void flush(void); public void set_output(int fd); public int putchr(int c); public void clear_bot_if_needed(void); public void putstr(constant char *s); public int less_printf(char *fmt, PARG *parg); public void get_return(void); public void error(char *fmt, PARG *parg); public void ierror(char *fmt, PARG *parg); public void ixerror(char *fmt, PARG *parg); public int query(char *fmt, PARG *parg); public int compile_pattern(char *pattern, int search_type, int show_error, PATTERN_TYPE *comp_pattern); public void uncompile_pattern(PATTERN_TYPE *pattern); public int valid_pattern(char *pattern); public int is_null_pattern(PATTERN_TYPE pattern); public int match_pattern(PATTERN_TYPE pattern, char *tpattern, char *line, int line_len, char **sp, char **ep, int nsp, int notbol, int search_type); public char * pattern_lib_name(void); public POSITION position(int sindex); public void add_forw_pos(POSITION pos); public void add_back_pos(POSITION pos); public void pos_clear(void); public void pos_init(void); public int onscreen(POSITION pos); public int empty_screen(void); public int empty_lines(int s, int e); public void get_scrpos(struct scrpos *scrpos, int where); public int sindex_from_sline(int sline); public void init_prompt(void); public char * pr_expand(constant char *proto); public char * eq_message(void); public char * pr_string(void); public char * wait_message(void); public void init_search(void); public void repaint_hilite(int on); public void clear_attn(void); public void undo_search(int clear); public void clr_hlist(struct hilite_tree *anchor); public void clr_hilite(void); public void clr_filter(void); public int is_filtered(POSITION pos); public POSITION next_unfiltered(POSITION pos); public POSITION prev_unfiltered(POSITION pos); public int is_hilited_attr(POSITION pos, POSITION epos, int nohide, int *p_matches); public void chg_hilite(void); public void chg_caseless(void); public int search(int search_type, char *pattern, int n); public void prep_hilite(POSITION spos, POSITION epos, int maxlines); public void set_filter_pattern(char *pattern, int search_type); public int is_filtering(void); public RETSIGTYPE winch(int type); public void init_signals(int on); public void psignals(void); public void cleantags(void); public int gettagtype(void); public void findtag(char *tag); public POSITION tagsearch(void); public char * nexttag(int n); public char * prevtag(int n); public int ntags(void); public int curr_tag(void); public int edit_tagfile(void); public int open_tty(void); public void open_getchr(void); public void close_getchr(void); public int pclose(FILE *f); public int default_wheel_lines(void); public int getchr(void); public void xbuf_init(struct xbuffer *xbuf); public void xbuf_deinit(struct xbuffer *xbuf); public void xbuf_reset(struct xbuffer *xbuf); public void xbuf_add_byte(struct xbuffer *xbuf, unsigned char b); public void xbuf_add_data(struct xbuffer *xbuf, unsigned char *data, int len); public int xbuf_pop(struct xbuffer *buf); public void xbuf_set(struct xbuffer *dst, struct xbuffer *src); public char * xbuf_char_data(struct xbuffer *xbuf); public int help_ckd_add(void *r, uintmax a, uintmax b, int rsize, int rsigned); public int help_ckd_mul(void *r, uintmax a, uintmax b, int rsize, int rsigned); diff --git a/contrib/less/help.c b/contrib/less/help.c index 363b7eccddf2..423e0393e383 100644 --- a/contrib/less/help.c +++ b/contrib/less/help.c @@ -1,303 +1,303 @@ -/* This file was generated by mkhelp.pl from less.hlp at 17:26 on 2023/4/6 */ +/* This file was generated by mkhelp.pl from less.hlp at 22:43 on 2023/7/20 */ #include "less.h" constant char helpdata[] = { '\n', ' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ',' ','S','\b','S','U','\b','U','M','\b','M','M','\b','M','A','\b','A','R','\b','R','Y','\b','Y',' ','O','\b','O','F','\b','F',' ','L','\b','L','E','\b','E','S','\b','S','S','\b','S',' ','C','\b','C','O','\b','O','M','\b','M','M','\b','M','A','\b','A','N','\b','N','D','\b','D','S','\b','S','\n', '\n', ' ',' ',' ',' ',' ',' ','C','o','m','m','a','n','d','s',' ','m','a','r','k','e','d',' ','w','i','t','h',' ','*',' ','m','a','y',' ','b','e',' ','p','r','e','c','e','d','e','d',' ','b','y',' ','a',' ','n','u','m','b','e','r',',',' 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','l','i','n','e','.','\n', ' ','T','A','B',' ','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.',' ','C','o','m','p','l','e','t','e',' ','f','i','l','e','n','a','m','e',' ','&',' ','c','y','c','l','e','.','\n', ' ','S','H','I','F','T','-','T','A','B',' ','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.',' ','E','S','C','-','T','A','B',' ',' ',' ','C','o','m','p','l','e','t','e',' ','f','i','l','e','n','a','m','e',' ','&',' ','r','e','v','e','r','s','e',' ','c','y','c','l','e','.','\n', ' ','c','t','r','l','-','L',' ','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.','.',' ','C','o','m','p','l','e','t','e',' ','f','i','l','e','n','a','m','e',',',' ','l','i','s','t',' ','a','l','l','.','\n', 0 }; constant int size_helpdata = sizeof(helpdata) - 1; diff --git a/contrib/less/less.h b/contrib/less/less.h index 4a4f26d83f05..2ba8c353deeb 100644 --- a/contrib/less/less.h +++ b/contrib/less/less.h @@ -1,626 +1,635 @@ /* * Copyright (C) 1984-2023 Mark Nudelman * * You may distribute under the terms of either the GNU General Public * License or the Less License, as specified in the README file. * * For more information, see the README file. */ #define NEWBOT 1 /* * Standard include file for "less". */ /* * Defines for MSDOS_COMPILER. */ #define MSOFTC 1 /* Microsoft C */ #define BORLANDC 2 /* Borland C */ #define WIN32C 3 /* Windows (Borland C or Microsoft C) */ #define DJGPPC 4 /* DJGPP C */ /* * Include the file of compile-time options. * The <> make cc search for it in -I., not srcdir. */ #include #ifdef _SEQUENT_ /* * Kludge for Sequent Dynix systems that have sigsetmask, but * it's not compatible with the way less calls it. * {{ Do other systems need this? }} */ #undef HAVE_SIGSETMASK #endif /* * Language details. */ #if HAVE_CONST #define constant const #else #define constant #endif #define public /* PUBLIC FUNCTION */ /* Library function declarations */ #if HAVE_SYS_TYPES_H #include #endif #if HAVE_STDIO_H #include #endif #if HAVE_FCNTL_H #include #endif #if HAVE_UNISTD_H #include #endif #if HAVE_CTYPE_H #include #endif #if HAVE_WCTYPE_H #include #endif #if HAVE_LIMITS_H #include #endif #if HAVE_STDINT_H #include #endif #if HAVE_STDLIB_H #include #endif #if HAVE_STRING_H #include #endif #if HAVE_STDCKDINT_H #include #else /* * These substitutes for C23 stdckdint macros do not set *R on overflow, * and they assume A and B are nonnegative. That is good enough for us. */ #define ckd_add(r, a, b) help_ckd_add(r, a, b, sizeof *(r), signed_expr(*(r))) #define ckd_mul(r, a, b) help_ckd_mul(r, a, b, sizeof *(r), signed_expr(*(r))) /* True if the integer expression E, after promotion, is signed. */ #define signed_expr(e) ((TRUE ? 0 : e) - 1 < 0) #endif #if defined UINTMAX_MAX typedef uintmax_t uintmax; #elif defined ULLONG_MAX typedef unsigned long long uintmax; #else typedef unsigned long uintmax; #endif /* OS-specific includes */ #ifdef _OSK #include #include #endif #ifdef __TANDEM #include #endif #if MSDOS_COMPILER==WIN32C || OS2 #include #endif #if MSDOS_COMPILER==DJGPPC #include #include #include #include #endif #if !HAVE_STDLIB_H char *getenv(); off_t lseek(); void *calloc(); void free(); #endif /* * Simple lowercase test which can be used during option processing * (before options are parsed which might tell us what charset to use). */ #define ASCII_IS_UPPER(c) ((c) >= 'A' && (c) <= 'Z') #define ASCII_IS_LOWER(c) ((c) >= 'a' && (c) <= 'z') #define ASCII_TO_UPPER(c) ((c) - 'a' + 'A') #define ASCII_TO_LOWER(c) ((c) - 'A' + 'a') #undef IS_UPPER #undef IS_LOWER #undef TO_UPPER #undef TO_LOWER #undef IS_SPACE #undef IS_DIGIT #if HAVE_WCTYPE #define IS_UPPER(c) iswupper(c) #define IS_LOWER(c) iswlower(c) #define TO_UPPER(c) towupper(c) #define TO_LOWER(c) towlower(c) #else #if HAVE_UPPER_LOWER #define IS_UPPER(c) isupper((unsigned char) (c)) #define IS_LOWER(c) islower((unsigned char) (c)) #define TO_UPPER(c) toupper((unsigned char) (c)) #define TO_LOWER(c) tolower((unsigned char) (c)) #else #define IS_UPPER(c) ASCII_IS_UPPER(c) #define IS_LOWER(c) ASCII_IS_LOWER(c) #define TO_UPPER(c) ASCII_TO_UPPER(c) #define TO_LOWER(c) ASCII_TO_LOWER(c) #endif #endif #ifdef isspace #define IS_SPACE(c) isspace((unsigned char)(c)) #else #define IS_SPACE(c) ((c) == ' ' || (c) == '\t' || (c) == '\n' || (c) == '\r' || (c) == '\f') #endif #ifdef isdigit #define IS_DIGIT(c) isdigit((unsigned char)(c)) #else #define IS_DIGIT(c) ((c) >= '0' && (c) <= '9') #endif #define IS_CSI_START(c) (((LWCHAR)(c)) == ESC || (((LWCHAR)(c)) == CSI)) #ifndef NULL #define NULL 0 #endif #ifndef TRUE #define TRUE 1 #endif #ifndef FALSE #define FALSE 0 #endif #define OPT_OFF 0 #define OPT_ON 1 #define OPT_ONPLUS 2 #if !HAVE_MEMCPY #ifndef memcpy #define memcpy(to,from,len) bcopy((from),(to),(len)) #endif #endif #if HAVE_SNPRINTF #define SNPRINTF1(str, size, fmt, v1) snprintf((str), (size), (fmt), (v1)) #define SNPRINTF2(str, size, fmt, v1, v2) snprintf((str), (size), (fmt), (v1), (v2)) #define SNPRINTF3(str, size, fmt, v1, v2, v3) snprintf((str), (size), (fmt), (v1), (v2), (v3)) #define SNPRINTF4(str, size, fmt, v1, v2, v3, v4) snprintf((str), (size), (fmt), (v1), (v2), (v3), (v4)) #else /* Use unsafe sprintf if we don't have snprintf. */ #define SNPRINTF1(str, size, fmt, v1) sprintf((str), (fmt), (v1)) #define SNPRINTF2(str, size, fmt, v1, v2) sprintf((str), (fmt), (v1), (v2)) #define SNPRINTF3(str, size, fmt, v1, v2, v3) sprintf((str), (fmt), (v1), (v2), (v3)) #define SNPRINTF4(str, size, fmt, v1, v2, v3, v4) sprintf((str), (fmt), (v1), (v2), (v3), (v4)) #endif #define BAD_LSEEK ((off_t)-1) #ifndef SEEK_SET #define SEEK_SET 0 #endif #ifndef SEEK_END #define SEEK_END 2 #endif #ifndef CHAR_BIT #define CHAR_BIT 8 #endif /* * Upper bound on the string length of an integer converted to string. * 302 / 1000 is ceil (log10 (2.0)). Subtract 1 for the sign bit; * add 1 for integer division truncation; add 1 more for a minus sign. */ #define INT_STRLEN_BOUND(t) ((sizeof(t) * CHAR_BIT - 1) * 302 / 1000 + 1 + 1) /* * Special types and constants. */ typedef unsigned long LWCHAR; typedef off_t POSITION; typedef off_t LINENUM; #define MIN_LINENUM_WIDTH 7 /* Default min printing width of a line number */ #define MAX_LINENUM_WIDTH 16 /* Max width of a line number */ #define MAX_STATUSCOL_WIDTH 4 /* Max width of the status column */ #define MAX_UTF_CHAR_LEN 6 /* Max bytes in one UTF-8 char */ #define MAX_PRCHAR_LEN 31 /* Max chars in prchar() result */ #define NULL_POSITION ((POSITION)(-1)) /* * Flags for open() */ #if MSDOS_COMPILER || OS2 #define OPEN_READ (O_RDONLY|O_BINARY) #else #ifdef _OSK #define OPEN_READ (S_IREAD) #else #ifdef O_RDONLY #define OPEN_READ (O_RDONLY) #else #define OPEN_READ (0) #endif #endif #endif #if defined(O_WRONLY) && defined(O_APPEND) #define OPEN_APPEND (O_APPEND|O_WRONLY) #else #ifdef _OSK #define OPEN_APPEND (S_IWRITE) #else #define OPEN_APPEND (1) #endif #endif +/* + * Flags for creat() + */ +#if MSDOS_COMPILER +#define CREAT_RW (S_IREAD|S_IWRITE) +#else +#define CREAT_RW 0644 +#endif + /* * Set a file descriptor to binary mode. */ #if MSDOS_COMPILER==MSOFTC #define SET_BINARY(f) _setmode(f, _O_BINARY); #else #if MSDOS_COMPILER || OS2 #define SET_BINARY(f) setmode(f, O_BINARY) #else #define SET_BINARY(f) #endif #endif /* * Does the shell treat "?" as a metacharacter? */ #if MSDOS_COMPILER || OS2 || _OSK #define SHELL_META_QUEST 0 #else #define SHELL_META_QUEST 1 #endif #define SPACES_IN_FILENAMES 1 /* * An IFILE represents an input file. */ #define IFILE void* #define NULL_IFILE ((IFILE)NULL) /* * The structure used to represent a "screen position". * This consists of a file position, and a screen line number. * The meaning is that the line starting at the given file * position is displayed on the ln-th line of the screen. * (Screen lines before ln are empty.) */ struct scrpos { POSITION pos; int ln; }; typedef union parg { char *p_string; int p_int; LINENUM p_linenum; char p_char; } PARG; #define NULL_PARG ((PARG *)NULL) struct textlist { char *string; char *endstring; }; struct wchar_range { LWCHAR first, last; }; struct wchar_range_table { struct wchar_range *table; int count; }; #if HAVE_POLL typedef short POLL_EVENTS; #endif #define EOI (-1) #define READ_ERR (-1) #define READ_INTR (-2) #define READ_AGAIN (-3) /* * A fraction is represented by a long n; the fraction is n/NUM_FRAC_DENOM. * To avoid overflow problems, 0 <= n < NUM_FRAC_DENUM <= LONG_MAX/100. */ #define NUM_FRAC_DENOM 1000000 #define NUM_LOG_FRAC_DENOM 6 /* How quiet should we be? */ #define NOT_QUIET 0 /* Ring bell at eof and for errors */ #define LITTLE_QUIET 1 /* Ring bell only for errors */ #define VERY_QUIET 2 /* Never ring bell */ /* How should we prompt? */ #define PR_SHORT 0 /* Prompt with colon */ #define PR_MEDIUM 1 /* Prompt with message */ #define PR_LONG 2 /* Prompt with longer message */ /* How should we handle backspaces? */ #define BS_SPECIAL 0 /* Do special things for underlining and bold */ #define BS_NORMAL 1 /* \b treated as normal char; actually output */ #define BS_CONTROL 2 /* \b treated as control char; prints as ^H */ /* How should we search? */ #define SRCH_FORW (1 << 0) /* Search forward from current position */ #define SRCH_BACK (1 << 1) /* Search backward from current position */ #define SRCH_NO_MOVE (1 << 2) /* Highlight, but don't move */ #define SRCH_INCR (1 << 3) /* Incremental search */ #define SRCH_FIND_ALL (1 << 4) /* Find and highlight all matches */ #define SRCH_NO_MATCH (1 << 8) /* Search for non-matching lines */ #define SRCH_PAST_EOF (1 << 9) /* Search past end-of-file, into next file */ #define SRCH_FIRST_FILE (1 << 10) /* Search starting at the first file */ #define SRCH_NO_REGEX (1 << 12) /* Don't use regular expressions */ #define SRCH_FILTER (1 << 13) /* Search is for '&' (filter) command */ #define SRCH_AFTER_TARGET (1 << 14) /* Start search after the target line */ #define SRCH_WRAP (1 << 15) /* Wrap-around search (continue at BOF/EOF) */ #define SRCH_SUBSEARCH(i) (1 << (16+(i))) /* Search for subpattern */ /* {{ Depends on NUM_SEARCH_COLORS==5 }} */ #define SRCH_SUBSEARCH_ALL (SRCH_SUBSEARCH(1)|SRCH_SUBSEARCH(2)|SRCH_SUBSEARCH(3)|SRCH_SUBSEARCH(4)|SRCH_SUBSEARCH(5)) #define SRCH_REVERSE(t) (((t) & SRCH_FORW) ? \ (((t) & ~SRCH_FORW) | SRCH_BACK) : \ (((t) & ~SRCH_BACK) | SRCH_FORW)) /* */ #define NO_MCA 0 #define MCA_DONE 1 #define MCA_MORE 2 #define CC_OK 0 /* Char was accepted & processed */ #define CC_QUIT 1 /* Char was a request to abort current cmd */ #define CC_ERROR 2 /* Char could not be accepted due to error */ #define CC_PASS 3 /* Char was rejected (internal) */ #define CF_QUIT_ON_ERASE 0001 /* Abort cmd if its entirely erased */ /* Special char bit-flags used to tell put_line() to do something special */ #define AT_NORMAL (0) #define AT_UNDERLINE (1 << 0) #define AT_BOLD (1 << 1) #define AT_BLINK (1 << 2) #define AT_STANDOUT (1 << 3) #define AT_ANSI (1 << 4) /* Content-supplied "ANSI" escape sequence */ #define AT_BINARY (1 << 5) /* LESS*BINFMT representation */ #define AT_HILITE (1 << 6) /* Internal highlights (e.g., for search) */ #define AT_COLOR_SHIFT 8 #define AT_NUM_COLORS 16 #define AT_COLOR ((AT_NUM_COLORS-1) << AT_COLOR_SHIFT) #define AT_COLOR_ATTN (1 << AT_COLOR_SHIFT) #define AT_COLOR_BIN (2 << AT_COLOR_SHIFT) #define AT_COLOR_CTRL (3 << AT_COLOR_SHIFT) #define AT_COLOR_ERROR (4 << AT_COLOR_SHIFT) #define AT_COLOR_LINENUM (5 << AT_COLOR_SHIFT) #define AT_COLOR_MARK (6 << AT_COLOR_SHIFT) #define AT_COLOR_PROMPT (7 << AT_COLOR_SHIFT) #define AT_COLOR_RSCROLL (8 << AT_COLOR_SHIFT) #define AT_COLOR_HEADER (9 << AT_COLOR_SHIFT) #define AT_COLOR_SEARCH (10 << AT_COLOR_SHIFT) #define AT_COLOR_SUBSEARCH(i) ((10+(i)) << AT_COLOR_SHIFT) #define NUM_SEARCH_COLORS (AT_NUM_COLORS-10-1) typedef enum { CT_NULL, CT_4BIT, CT_6BIT } COLOR_TYPE; typedef enum { CV_BLUE = 1, CV_GREEN = 2, CV_RED = 4, CV_BRIGHT = 8, CV_NOCHANGE = -2, CV_ERROR = -1 } COLOR_VALUE; /* ANSI states */ #define ANSI_MID 1 #define ANSI_ERR 2 #define ANSI_END 3 #if '0' == 240 #define IS_EBCDIC_HOST 1 #endif #if IS_EBCDIC_HOST /* * Long definition for EBCDIC. * Since the argument is usually a constant, this macro normally compiles * into a constant. */ #define CONTROL(c) ( \ (c)=='[' ? '\047' : \ (c)=='a' ? '\001' : \ (c)=='b' ? '\002' : \ (c)=='c' ? '\003' : \ (c)=='d' ? '\067' : \ (c)=='e' ? '\055' : \ (c)=='f' ? '\056' : \ (c)=='g' ? '\057' : \ (c)=='h' ? '\026' : \ (c)=='i' ? '\005' : \ (c)=='j' ? '\025' : \ (c)=='k' ? '\013' : \ (c)=='l' ? '\014' : \ (c)=='m' ? '\015' : \ (c)=='n' ? '\016' : \ (c)=='o' ? '\017' : \ (c)=='p' ? '\020' : \ (c)=='q' ? '\021' : \ (c)=='r' ? '\022' : \ (c)=='s' ? '\023' : \ (c)=='t' ? '\074' : \ (c)=='u' ? '\075' : \ (c)=='v' ? '\062' : \ (c)=='w' ? '\046' : \ (c)=='x' ? '\030' : \ (c)=='y' ? '\031' : \ (c)=='z' ? '\077' : \ (c)=='A' ? '\001' : \ (c)=='B' ? '\002' : \ (c)=='C' ? '\003' : \ (c)=='D' ? '\067' : \ (c)=='E' ? '\055' : \ (c)=='F' ? '\056' : \ (c)=='G' ? '\057' : \ (c)=='H' ? '\026' : \ (c)=='I' ? '\005' : \ (c)=='J' ? '\025' : \ (c)=='K' ? '\013' : \ (c)=='L' ? '\014' : \ (c)=='M' ? '\015' : \ (c)=='N' ? '\016' : \ (c)=='O' ? '\017' : \ (c)=='P' ? '\020' : \ (c)=='Q' ? '\021' : \ (c)=='R' ? '\022' : \ (c)=='S' ? '\023' : \ (c)=='T' ? '\074' : \ (c)=='U' ? '\075' : \ (c)=='V' ? '\062' : \ (c)=='W' ? '\046' : \ (c)=='X' ? '\030' : \ (c)=='Y' ? '\031' : \ (c)=='Z' ? '\077' : \ (c)=='|' ? '\031' : \ (c)=='\\' ? '\034' : \ (c)=='^' ? '\036' : \ (c)&077) #else #define CONTROL(c) ((c)&037) #endif /* IS_EBCDIC_HOST */ #define ESC CONTROL('[') #define ESCS "\33" #define CSI ((unsigned char)'\233') #define CHAR_END_COMMAND 0x40000000 #if _OSK_MWC32 #define LSIGNAL(sig,func) os9_signal(sig,func) #else #define LSIGNAL(sig,func) signal(sig,func) #endif #if HAVE_SIGPROCMASK #if HAVE_SIGSET_T #else #undef HAVE_SIGPROCMASK #endif #endif #if HAVE_SIGPROCMASK #if HAVE_SIGEMPTYSET #else #undef sigemptyset #define sigemptyset(mp) *(mp) = 0 #endif #endif #define S_INTERRUPT 01 #define S_STOP 02 #define S_WINCH 04 #define ABORT_SIGS() (sigs & (S_INTERRUPT|S_STOP)) #ifdef EXIT_SUCCESS #define QUIT_OK EXIT_SUCCESS #else #define QUIT_OK 0 #endif #ifdef EXIT_FAILURE #define QUIT_ERROR EXIT_FAILURE #define QUIT_INTERRUPT (EXIT_FAILURE+1) #else #define QUIT_ERROR 1 #define QUIT_INTERRUPT 2 #endif #define QUIT_SAVED_STATUS (-1) #define FOLLOW_DESC 0 #define FOLLOW_NAME 1 /* filestate flags */ #define CH_CANSEEK 001 #define CH_KEEPOPEN 002 #define CH_POPENED 004 #define CH_HELPFILE 010 #define CH_NODATA 020 /* Special case for zero length files */ #define ch_zero() ((POSITION)0) #define FAKE_HELPFILE "@/\\less/\\help/\\file/\\@" #define FAKE_EMPTYFILE "@/\\less/\\empty/\\file/\\@" /* Flags for cvt_text */ #define CVT_TO_LC 01 /* Convert upper-case to lower-case */ #define CVT_BS 02 /* Do backspace processing */ #define CVT_CRLF 04 /* Remove CR after LF */ #define CVT_ANSI 010 /* Remove ANSI escape sequences */ #if HAVE_TIME_T #define time_type time_t #else #define time_type long #endif /* X11 mouse reporting definitions */ #define X11MOUSE_BUTTON1 0 /* Left button press */ #define X11MOUSE_BUTTON2 1 /* Middle button press */ #define X11MOUSE_BUTTON3 2 /* Right button press */ #define X11MOUSE_BUTTON_REL 3 /* Button release */ #define X11MOUSE_WHEEL_UP 0x40 /* Wheel scroll up */ #define X11MOUSE_WHEEL_DOWN 0x41 /* Wheel scroll down */ #define X11MOUSE_OFFSET 0x20 /* Added to button & pos bytes to create a char */ #if LESSTEST #define LESS_DUMP_CHAR CONTROL(']') #endif struct mlist; struct loption; struct hilite_tree; struct ansi_state; #include "pattern.h" #include "xbuf.h" #include "funcs.h" /* Functions not included in funcs.h */ void postoa(POSITION, char*, int); void linenumtoa(LINENUM, char*, int); void inttoa(int, char*, int); int lstrtoi(char*, char**, int); POSITION lstrtopos(char*, char**, int); unsigned long lstrtoul(char*, char**, int); #if MSDOS_COMPILER==WIN32C int pclose(FILE*); #endif diff --git a/contrib/less/less.nro b/contrib/less/less.nro index c0ef536db8a3..ab0ea975df45 100644 --- a/contrib/less/less.nro +++ b/contrib/less/less.nro @@ -1,2328 +1,2335 @@ '\" t -.TH LESS 1 "Version 632: 06 Apr 2023" +.TH LESS 1 "Version 643: 20 Jul 2023" .SH NAME less \- opposite of more .SH SYNOPSIS .B "less \-?" .br .B "less \-\-help" .br .B "less \-V" .br .B "less \-\-version" .br .B "less [\-[+]aABcCdeEfFgGiIJKLmMnNqQrRsSuUVwWX\(ti]" .br .B " [\-b \fIspace\/\fP] [\-h \fIlines\/\fP] [\-j \fIline\/\fP] [\-k \fIkeyfile\/\fP]" .br .B " [\-{oO} \fIlogfile\/\fP] [\-p \fIpattern\/\fP] [\-P \fIprompt\/\fP] [\-t \fItag\/\fP]" .br .B " [\-T \fItagsfile\/\fP] [\-x \fItab\/\fP,...] [\-y \fIlines\/\fP] [\-[z] \fIlines\/\fP]" .br .B " [\-# \fIshift\/\fP] [+[+]\fIcmd\/\fP] [\-\-] [\fIfilename\/\fP]..." .br (See the OPTIONS section for alternate option syntax with long option names.) . .SH DESCRIPTION .B Less is a program similar to .BR more (1), but which allows backward movement in the file as well as forward movement. Also, .B less does not have to read the entire input file before starting, so with large input files it starts up faster than text editors like .BR vi (1). .B Less uses termcap (or terminfo on some systems), so it can run on a variety of terminals. There is even limited support for hardcopy terminals. (On a hardcopy terminal, lines which should be printed at the top of the screen are prefixed with a caret.) .PP Commands are based on both .B more and .BR vi . Commands may be preceded by a decimal number, called N in the descriptions below. The number is used by some commands, as indicated. . .SH COMMANDS In the following descriptions, \(haX means control-X. ESC stands for the ESCAPE key; for example ESC-v means the two character sequence "ESCAPE", then "v". .IP "h or H" Help: display a summary of these commands. If you forget all the other commands, remember this one. .IP "SPACE or \(haV or f or \(haF" Scroll forward N lines, default one window (see option \-z below). If N is more than the screen size, only the final screenful is displayed. Warning: some systems use \(haV as a special literalization character. .IP "z" Like SPACE, but if N is specified, it becomes the new window size. .IP "ESC-SPACE" Like SPACE, but scrolls a full screenful, even if it reaches end-of-file in the process. .IP "ENTER or RETURN or \(haN or e or \(haE or j or \(haJ" Scroll forward N lines, default 1. The entire N lines are displayed, even if N is more than the screen size. .IP "d or \(haD" Scroll forward N lines, default one half of the screen size. If N is specified, it becomes the new default for subsequent d and u commands. .IP "b or \(haB or ESC-v" Scroll backward N lines, default one window (see option \-z below). If N is more than the screen size, only the final screenful is displayed. .IP "w" Like ESC-v, but if N is specified, it becomes the new window size. .IP "y or \(haY or \(haP or k or \(haK" Scroll backward N lines, default 1. The entire N lines are displayed, even if N is more than the screen size. Warning: some systems use \(haY as a special job control character. .IP "u or \(haU" Scroll backward N lines, default one half of the screen size. If N is specified, it becomes the new default for subsequent d and u commands. .IP "J" Like j, but continues to scroll beyond the end of the file. .IP "K or Y" Like k, but continues to scroll beyond the beginning of the file. .IP "ESC-) or RIGHTARROW" Scroll horizontally right N characters, default half the screen width (see the \-# option). If a number N is specified, it becomes the default for future RIGHTARROW and LEFTARROW commands. While the text is scrolled, it acts as though the \-S option (chop lines) were in effect. .IP "ESC-( or LEFTARROW" Scroll horizontally left N characters, default half the screen width (see the \-# option). If a number N is specified, it becomes the default for future RIGHTARROW and LEFTARROW commands. .IP "ESC-} or \(haRIGHTARROW" Scroll horizontally right to show the end of the longest displayed line. .IP "ESC-{ or \(haLEFTARROW" Scroll horizontally left back to the first column. .IP "r or \(haR or \(haL" Repaint the screen. .IP R Repaint the screen, discarding any buffered input. That is, reload the current file. Useful if the file is changing while it is being viewed. .IP "F" Scroll forward, and keep trying to read when the end of file is reached. Normally this command would be used when already at the end of the file. It is a way to monitor the tail of a file which is growing while it is being viewed. (The behavior is similar to the "tail \-f" command.) To stop waiting for more data, enter the interrupt character (usually \(haC). On systems which support -.BR poll (1) +.BR poll (2) you can also use \(haX or the character specified by the \-\-intr option. If the input is a pipe and the \-\-exit-follow-on-close option is in effect, .B less will automatically stop waiting for data when the input side of the pipe is closed. .IP "ESC-F" Like F, but as soon as a line is found which matches the last search pattern, the terminal bell is rung and forward scrolling stops. .IP "g or < or ESC-<" Go to line N in the file, default 1 (beginning of file). (Warning: this may be slow if N is large.) .IP "G or > or ESC->" Go to line N in the file, default the end of the file. (Warning: this may be slow if N is large, or if N is not specified and standard input, rather than a file, is being read.) .IP "ESC-G" Same as G, except if no number N is specified and the input is standard input, goes to the last line which is currently buffered. .IP "p or %" Go to a position N percent into the file. N should be between 0 and 100, and may contain a decimal point. .IP "P" Go to the line containing byte offset N in the file. .IP "{" If a left curly bracket appears in the top line displayed on the screen, the { command will go to the matching right curly bracket. The matching right curly bracket is positioned on the bottom line of the screen. If there is more than one left curly bracket on the top line, a number N may be used to specify the N-th bracket on the line. .IP "}" If a right curly bracket appears in the bottom line displayed on the screen, the } command will go to the matching left curly bracket. The matching left curly bracket is positioned on the top line of the screen. If there is more than one right curly bracket on the bottom line, a number N may be used to specify the N-th bracket on the line. .IP "(" Like {, but applies to parentheses rather than curly brackets. .IP ")" Like }, but applies to parentheses rather than curly brackets. .IP "[" Like {, but applies to square brackets rather than curly brackets. .IP "]" Like }, but applies to square brackets rather than curly brackets. .IP "ESC-\(haF" Followed by two characters, acts like {, but uses the two characters as open and close brackets, respectively. For example, "ESC \(haF < >" could be used to go forward to the > which matches the < in the top displayed line. .IP "ESC-\(haB" Followed by two characters, acts like }, but uses the two characters as open and close brackets, respectively. For example, "ESC \(haB < >" could be used to go backward to the < which matches the > in the bottom displayed line. .IP m Followed by any lowercase or uppercase letter, marks the first displayed line with that letter. If the status column is enabled via the \-J option, the status column shows the marked line. .IP M Acts like m, except the last displayed line is marked rather than the first displayed line. .IP "\(aq" (Single quote.) Followed by any lowercase or uppercase letter, returns to the position which was previously marked with that letter. Followed by another single quote, returns to the position at which the last "large" movement command was executed. Followed by a \(ha or $, jumps to the beginning or end of the file respectively. Marks are preserved when a new file is examined, so the \(aq command can be used to switch between input files. .IP "\(haX\(haX" Same as single quote. .IP "ESC-m" Followed by any lowercase or uppercase letter, clears the mark identified by that letter. .IP /pattern Search forward in the file for the N-th line containing the pattern. N defaults to 1. The pattern is a regular expression, as recognized by the regular expression library supplied by your system. +By default, searching is case-sensitive (uppercase and lowercase +are considered different); the \-i option can be used to change this. The search starts at the first line displayed (but see the \-a and \-j options, which change this). .sp Certain characters are special if entered at the beginning of the pattern; they modify the type of search rather than become part of the pattern: .RS .IP "\(haN or !" Search for lines which do NOT match the pattern. .IP "\(haE or *" Search multiple files. That is, if the search reaches the END of the current file without finding a match, the search continues in the next file in the command line list. .IP "\(haF or @" Begin the search at the first line of the FIRST file in the command line list, regardless of what is currently displayed on the screen or the settings of the \-a or \-j options. .IP "\(haK" Highlight any text which matches the pattern on the current screen, but don't move to the first match (KEEP current position). .IP "\(haR" Don't interpret regular expression metacharacters; that is, do a simple textual comparison. .IP "\(haS" Followed by a digit N between 1 and 5. Only text which has a non-empty match for the N-th parenthesized SUB-PATTERN will be considered to match the pattern. (Supported only if .B less is built with one of the regular expression libraries .BR posix ", " pcre ", or " pcre2 ".)" Multiple \(haS modifiers can be specified, to match more than one sub-pattern. .IP "\(haW" WRAP around the current file. That is, if the search reaches the end of the current file without finding a match, the search continues from the first line of the current file up to the line where it started. If the \(haW modifier is set, the \(haE modifier is ignored. .RE .IP ?pattern Search backward in the file for the N-th line containing the pattern. The search starts at the last line displayed (but see the \-a and \-j options, which change this). .sp Certain characters are special as in the / command: .RS .IP "\(haN or !" Search for lines which do NOT match the pattern. .IP "\(haE or *" Search multiple files. That is, if the search reaches the beginning of the current file without finding a match, the search continues in the previous file in the command line list. .IP "\(haF or @" Begin the search at the last line of the last file in the command line list, regardless of what is currently displayed on the screen or the settings of the \-a or \-j options. .IP "\(haK" As in forward searches. .IP "\(haR" As in forward searches. .IP "\(haS" As in forward searches. .IP "\(haW" WRAP around the current file. That is, if the search reaches the beginning of the current file without finding a match, the search continues from the last line of the current file up to the line where it started. .RE .IP "ESC-/pattern" Same as "/*". .IP "ESC-?pattern" Same as "?*". .IP n Repeat previous search, for N-th line containing the last pattern. If the previous search was modified by \(haN, the search is made for the N-th line NOT containing the pattern. If the previous search was modified by \(haE, the search continues in the next (or previous) file if not satisfied in the current file. If the previous search was modified by \(haR, the search is done without using regular expressions. There is no effect if the previous search was modified by \(haF or \(haK. .IP N Repeat previous search, but in the reverse direction. .IP "ESC-n" Repeat previous search, but crossing file boundaries. The effect is as if the previous search were modified by *. .IP "ESC-N" Repeat previous search, but in the reverse direction and crossing file boundaries. .IP "ESC-u" Undo search highlighting. Turn off highlighting of strings matching the current search pattern. If highlighting is already off because of a previous ESC-u command, turn highlighting back on. Any search command will also turn highlighting back on. (Highlighting can also be disabled by toggling the \-G option; in that case search commands do not turn highlighting back on.) .IP "ESC-U" Like ESC-u but also clears the saved search pattern. If the status column is enabled via the \-J option, this clears all search matches marked in the status column. .IP "&pattern" Display only lines which match the pattern; lines which do not match the pattern are not displayed. If pattern is empty (if you type & immediately followed by ENTER), any filtering is turned off, and all lines are displayed. While filtering is in effect, an ampersand is displayed at the beginning of the prompt, as a reminder that some lines in the file may be hidden. Multiple & commands may be entered, in which case only lines which match all of the patterns will be displayed. .sp Certain characters are special as in the / command: .RS .IP "\(haN or !" Display only lines which do NOT match the pattern. .IP "\(haR" Don't interpret regular expression metacharacters; that is, do a simple textual comparison. .RE .IP ":e [filename]" Examine a new file. If the filename is missing, the "current" file (see the :n and :p commands below) from the list of files in the command line is re-examined. A percent sign (%) in the filename is replaced by the name of the current file. A pound sign (#) is replaced by the name of the previously examined file. However, two consecutive percent signs are simply replaced with a single percent sign. This allows you to enter a filename that contains a percent sign in the name. Similarly, two consecutive pound signs are replaced with a single pound sign. The filename is inserted into the command line list of files so that it can be seen by subsequent :n and :p commands. If the filename consists of several files, they are all inserted into the list of files and the first one is examined. If the filename contains one or more spaces, the entire filename should be enclosed in double quotes (also see the \-" option). .IP "\(haX\(haV or E" Same as :e. Warning: some systems use \(haV as a special literalization character. On such systems, you may not be able to use \(haV. .IP ":n" Examine the next file (from the list of files given in the command line). If a number N is specified, the N-th next file is examined. .IP ":p" Examine the previous file in the command line list. If a number N is specified, the N-th previous file is examined. .IP ":x" Examine the first file in the command line list. If a number N is specified, the N-th file in the list is examined. .IP ":d" Remove the current file from the list of files. .IP "t" Go to the next tag, if there were more than one matches for the current tag. See the \-t option for more details about tags. .IP "T" Go to the previous tag, if there were more than one matches for the current tag. .IP "= or \(haG or :f" Prints some information about the file being viewed, including its name and the line number and byte offset of the bottom line being displayed. If possible, it also prints the length of the file, the number of lines in the file and the percent of the file above the last displayed line. .IP \- Followed by one of the command line option letters (see OPTIONS below), this will change the setting of that option and print a message describing the new setting. If a \(haP (CONTROL-P) is entered immediately after the dash, the setting of the option is changed but no message is printed. If the option letter has a numeric value (such as \-b or \-h), or a string value (such as \-P or \-t), a new value may be entered after the option letter. If no new value is entered, a message describing the current setting is printed and nothing is changed. .IP \-\- Like the \- command, but takes a long option name (see OPTIONS below) rather than a single option letter. You must press ENTER or RETURN after typing the option name. A \(haP immediately after the second dash suppresses printing of a message describing the new setting, as in the \- command. .IP \-+ Followed by one of the command line option letters this will reset the option to its default setting and print a message describing the new setting. (The "\-+\fIX\fP" command does the same thing as "\-+\fIX\fP" on the command line.) This does not work for string-valued options. .IP \-\-+ Like the \-+ command, but takes a long option name rather than a single option letter. .IP \-! Followed by one of the command line option letters, this will reset the option to the "opposite" of its default setting and print a message describing the new setting. This does not work for numeric or string-valued options. .IP \-\-! Like the \-!\& command, but takes a long option name rather than a single option letter. .IP _ (Underscore.) Followed by one of the command line option letters, this will print a message describing the current setting of that option. The setting of the option is not changed. .IP __ (Double underscore.) Like the _ (underscore) command, but takes a long option name rather than a single option letter. You must press ENTER or RETURN after typing the option name. .IP +cmd Causes the specified cmd to be executed each time a new file is examined. For example, +G causes .B less to initially display each file starting at the end rather than the beginning. .IP V Prints the version number of .B less being run. .IP "q or Q or :q or :Q or ZZ" Exits .BR less . .PP The following six commands may or may not be valid, depending on your particular installation. . .IP v Invokes an editor to edit the current file being viewed. The editor is taken from the environment variable VISUAL if defined, or EDITOR if VISUAL is not defined, or defaults to "vi" if neither VISUAL nor EDITOR is defined. See also the discussion of LESSEDIT under the section on PROMPTS below. .IP "! shell-command" Invokes a shell to run the shell-command given. A percent sign (%) in the command is replaced by the name of the current file. A pound sign (#) is replaced by the name of the previously examined file. "!!" repeats the last shell command. "!" with no shell command simply invokes a shell. On Unix systems, the shell is taken from the environment variable SHELL, or defaults to "sh". On MS-DOS and OS/2 systems, the shell is the normal command processor. .IP "# shell-command" Similar to the "!" command, except that the command is expanded in the same way as prompt strings. For example, the name of the current file would be given as "%f". .IP "| shell-command" represents any mark letter. Pipes a section of the input file to the given shell command. The section of the file to be piped is between the position marked by the letter and the current screen. The entire current screen is included, regardless of whether the marked position is before or after the current screen. may also be \(ha or $ to indicate beginning or end of file respectively. If is \&.\& or newline, the current screen is piped. .IP "s filename" Save the input to a file. This works only if the input is a pipe, not an ordinary file. .IP "\(haX" When the "Waiting for data" message is displayed, such as while in the F command, pressing \(haX will stop .B less from waiting and return to a prompt. This may cause .B less to think that the file ends at the current position, so it may be necessary to use the R or F command to see more data. The \-\-intr option can be used to specify a different character to use instead of \(haX. This command works only on systems that support the -.BR poll (1) +.BR poll (2) function. On systems without -.BR poll (1), +.BR poll (2), the interrupt character (usually \(haC) can be used instead. . .SH OPTIONS Command line options are described below. Most options may be changed while .B less is running, via the "\-" command. .PP Some options may be given in one of two forms: either a dash followed by a single letter, or two dashes followed by a long option name. A long option name may be abbreviated as long as the abbreviation is unambiguous. For example, \-\-quit-at-eof may be abbreviated \-\-quit, but not \-\-qui, since both \-\-quit-at-eof and \-\-quiet begin with \-\-qui. Some long option names are in uppercase, such as \-\-QUIT-AT-EOF, as distinct from \-\-quit-at-eof. Such option names need only have their first letter capitalized; the remainder of the name may be in either case. For example, \-\-Quit-at-eof is equivalent to \-\-QUIT-AT-EOF. .PP Options are also taken from the environment variable "LESS". For example, to avoid typing "less \-options \&...\&" each time .B less is invoked, you might tell .BR csh : .sp setenv LESS "\-options" .sp or if you use .BR sh : .sp LESS="\-options"; export LESS .sp On MS-DOS, you don't need the quotes, but you should replace any percent signs in the options string by double percent signs. .sp The environment variable is parsed before the command line, so command line options override the LESS environment variable. If an option appears in the LESS variable, it can be reset to its default value on the command line by beginning the command line option with "\-+". .sp Some options like \-k or \-D require a string to follow the option letter. The string for that option is considered to end when a dollar sign ($) is found. For example, you can set two \-D options like this: .sp LESS="Dn9.1$Ds4.1" .sp If the \-\-use-backslash option appears earlier in the options, then a dollar sign or backslash may be included literally in an option string by preceding it with a backslash. If the \-\-use-backslash option is not in effect, then backslashes are not treated specially, and there is no way to include a dollar sign in the option string. .IP "\-? or \-\-help" This option displays a summary of the commands accepted by .B less (the same as the h command). (Depending on how your shell interprets the question mark, it may be necessary to quote the question mark, thus: "\-\e?".) .IP "\-a or \-\-search-skip-screen" By default, forward searches start at the top of the displayed screen and backwards searches start at the bottom of the displayed screen (except for repeated searches invoked by the n or N commands, which start after or before the "target" line respectively; see the \-j option for more about the target line). The \-a option causes forward searches to instead start at the bottom of the screen and backward searches to start at the top of the screen, thus skipping all lines displayed on the screen. .IP "\-A or \-\-SEARCH-SKIP-SCREEN" Causes all forward searches (not just non-repeated searches) to start just after the target line, and all backward searches to start just before the target line. Thus, forward searches will skip part of the displayed screen (from the first line up to and including the target line). Similarly backwards searches will skip the displayed screen from the last line up to and including the target line. This was the default behavior in less versions prior to 441. .IP "\-b\fIn\fP or \-\-buffers=\fIn\fP" Specifies the amount of buffer space .B less will use for each file, in units of kilobytes (1024 bytes). By default 64\ KB of buffer space is used for each file (unless the file is a pipe; see the \-B option). The \-b option specifies instead that \fIn\fP kilobytes of buffer space should be used for each file. If \fIn\fP is \-1, buffer space is unlimited; that is, the entire file can be read into memory. .IP "\-B or \-\-auto-buffers" By default, when data is read from a pipe, buffers are allocated automatically as needed. If a large amount of data is read from the pipe, this can cause a large amount of memory to be allocated. The \-B option disables this automatic allocation of buffers for pipes, so that only 64\ KB (or the amount of space specified by the \-b option) is used for the pipe. Warning: use of \-B can result in erroneous display, since only the most recently viewed part of the piped data is kept in memory; any earlier data is lost. Lost characters are displayed as question marks. .IP "\-c or \-\-clear-screen" Causes full screen repaints to be painted from the top line down. By default, full screen repaints are done by scrolling from the bottom of the screen. .IP "\-C or \-\-CLEAR-SCREEN" Same as \-c, for compatibility with older versions of .BR less . .IP "\-d or \-\-dumb" The \-d option suppresses the error message normally displayed if the terminal is dumb; that is, lacks some important capability, such as the ability to clear the screen or scroll backward. The \-d option does not otherwise change the behavior of .B less on a dumb terminal. .IP "\-D\fBx\fP\fIcolor\fP or \-\-color=\fBx\fP\fIcolor\fP" Changes the color of different parts of the displayed text. \fBx\fP is a single character which selects the type of text whose color is being set: .RS .IP "B" Binary characters. .IP "C" Control characters. .IP "E" Errors and informational messages. .IP "H" Header lines and columns, set via the \-\-header option. .IP "M" Mark letters in the status column. .IP "N" Line numbers enabled via the \-N option. .IP "P" Prompts. .IP "R" The rscroll character. .IP "S" Search results. .IP "1-5" The text in a search result which matches the first through fifth parenthesized sub-pattern. Sub-pattern coloring works only if .B less is built with one of the regular expression libraries .BR posix ", " pcre ", or " pcre2 . .IP "W" The highlight enabled via the \-w option. .IP "d" Bold text. .IP "k" Blinking text. .IP "s" Standout text. .IP "u" Underlined text. .RE .RS The uppercase letters and digits can be used only when the \-\-use-color option is enabled. When text color is specified by both an uppercase letter and a lowercase letter, the uppercase letter takes precedence. For example, error messages are normally displayed as standout text. So if both "s" and "E" are given a color, the "E" color applies to error messages, and the "s" color applies to other standout text. The "d" and "u" letters refer to bold and underline text formed by overstriking with backspaces (see the \-U option), not to text using ANSI escape sequences with the \-R option. .PP A lowercase letter may be followed by a + to indicate that the normal format change and the specified color should both be used. For example, \-Dug displays underlined text as green without underlining; the green color has replaced the usual underline formatting. But \-Du+g displays underlined text as both green and in underlined format. .PP \fIcolor\fP is either a 4-bit color string or an 8-bit color string: .PP A 4-bit color string is zero, one or two characters, where the first character specifies the foreground color and the second specifies the background color as follows: .IP "b" Blue .IP "c" Cyan .IP "g" Green .IP "k" Black .IP "m" Magenta .IP "r" Red .IP "w" White .IP "y" Yellow .PP The corresponding uppercase letter denotes a brighter shade of the color. For example, \-DNGk displays line numbers as bright green text on a black background, and \-DEbR displays error messages as blue text on a bright red background. If either character is a "-" or is omitted, the corresponding color is set to that of normal text. .PP An 8-bit color string is one or two decimal integers separated by a dot, where the first integer specifies the foreground color and the second specifies the background color. Each integer is a value between 0 and 255 inclusive which selects a "CSI 38;5" color value (see .br .nh https://en.wikipedia.org/wiki/ANSI_escape_code#SGR) .hy If either integer is a "-" or is omitted, the corresponding color is set to that of normal text. On MS-DOS versions of .BR less , 8-bit color is not supported; instead, decimal values are interpreted as 4-bit CHAR_INFO.Attributes values (see .br .nh https://docs.microsoft.com/en-us/windows/console/char-info-str). .hy +.PP +On MS-DOS only, the \-Da option may be used to specify strict parsing of +ANSI color (SGR) sequences when the \-R option is used. +Without this option, sequences that change text attributes +(bold, underline, etc.) may clear the text color. .RE .IP "\-e or \-\-quit-at-eof" Causes .B less to automatically exit the second time it reaches end-of-file. By default, the only way to exit .B less is via the "q" command. .IP "\-E or \-\-QUIT-AT-EOF" Causes .B less to automatically exit the first time it reaches end-of-file. .IP "\-f or \-\-force" Forces non-regular files to be opened. (A non-regular file is a directory or a device special file.) Also suppresses the warning message when a binary file is opened. By default, .B less will refuse to open non-regular files. Note that some operating systems will not allow directories to be read, even if \-f is set. .IP "\-F or \-\-quit-if-one-screen" Causes .B less to automatically exit if the entire file can be displayed on the first screen. .IP "\-g or \-\-hilite-search" Normally, .B less will highlight ALL strings which match the last search command. The \-g option changes this behavior to highlight only the particular string which was found by the last search command. This can cause .B less to run somewhat faster than the default. .IP "\-G or \-\-HILITE-SEARCH" The \-G option suppresses all highlighting of strings found by search commands. .IP "\-h\fIn\fP or \-\-max-back-scroll=\fIn\fP" Specifies a maximum number of lines to scroll backward. If it is necessary to scroll backward more than \fIn\fP lines, the screen is repainted in a forward direction instead. (If the terminal does not have the ability to scroll backward, \-h0 is implied.) .IP "\-i or \-\-ignore-case" Causes searches to ignore case; that is, uppercase and lowercase are considered identical. This option is ignored if any uppercase letters appear in the search pattern; in other words, if a pattern contains uppercase letters, then that search does not ignore case. .IP "\-I or \-\-IGNORE-CASE" Like \-i, but searches ignore case even if the pattern contains uppercase letters. .IP "\-j\fIn\fP or \-\-jump-target=\fIn\fP" Specifies a line on the screen where the "target" line is to be positioned. The target line is the line specified by any command to search for a pattern, jump to a line number, jump to a file percentage or jump to a tag. The screen line may be specified by a number: the top line on the screen is 1, the next is 2, and so on. The number may be negative to specify a line relative to the bottom of the screen: the bottom line on the screen is \-1, the second to the bottom is \-2, and so on. Alternately, the screen line may be specified as a fraction of the height of the screen, starting with a decimal point: \&.5 is in the middle of the screen, \&.3 is three tenths down from the first line, and so on. If the line is specified as a fraction, the actual line number is recalculated if the terminal window is resized. If any form of the \-j option is used, repeated forward searches (invoked with "n" or "N") begin at the line immediately after the target line, and repeated backward searches begin at the target line, unless changed by \-a or \-A. For example, if "\-j4" is used, the target line is the fourth line on the screen, so forward searches begin at the fifth line on the screen. However nonrepeated searches (invoked with "/" or "?") always begin at the start or end of the current screen respectively. .IP "\-J or \-\-status-column" Displays a status column at the left edge of the screen. The character displayed in the status column may be one of: .RS .IP ">" The line is chopped with the \-S option, and the text that is chopped off beyond the right edge of the screen contains a match for the current search. .IP "<" The line is horizontally shifted, and the text that is shifted beyond the left side of the screen contains a match for the current search. .IP "=" The line is both chopped and shifted, and there are matches beyond both sides of the screen. .IP "*" There are matches in the visible part of the line but none to the right or left of it. .IP "a-z, A-Z" The line has been marked with the corresponding letter via the m command. .RE .IP "\-k\fIfilename\fP or \-\-lesskey-file=\fIfilename\fP" Causes .B less to open and interpret the named file as a .BR lesskey (1) binary file. Multiple \-k options may be specified. If the LESSKEY or LESSKEY_SYSTEM environment variable is set, or if a lesskey file is found in a standard place (see KEY BINDINGS), it is also used as a .B lesskey file. .IP "\-\-lesskey-src=\fIfilename\fP" Causes .B less to open and interpret the named file as a .BR lesskey (1) source file. If the LESSKEYIN or LESSKEYIN_SYSTEM environment variable is set, or if a lesskey source file is found in a standard place (see KEY BINDINGS), it is also used as a .I "lesskey source" file. Prior to version 582, the .B lesskey program needed to be run to convert a .I "lesskey source" file to a .I "lesskey binary" file for .B less to use. Newer versions of .B less read the .I "lesskey source" file directly and ignore the binary file if the source file exists. .IP "\-K or \-\-quit-on-intr" Causes .B less to exit immediately (with status 2) when an interrupt character (usually \(haC) is typed. Normally, an interrupt character causes .B less to stop whatever it is doing and return to its command prompt. Note that use of this option makes it impossible to return to the command prompt from the "F" command. .IP "\-L or \-\-no-lessopen" Ignore the LESSOPEN environment variable (see the INPUT PREPROCESSOR section below). This option can be set from within .BR less , but it will apply only to files opened subsequently, not to the file which is currently open. .IP "\-m or \-\-long-prompt" Causes .B less to prompt verbosely (like .BR more (1)), with the percent into the file. By default, .B less prompts with a colon. .IP "\-M or \-\-LONG-PROMPT" Causes .B less to prompt even more verbosely than .BR more (1). .IP "\-n or \-\-line-numbers" Suppresses line numbers. The default (to use line numbers) may cause .B less to run more slowly in some cases, especially with a very large input file. Suppressing line numbers with the \-n option will avoid this problem. Using line numbers means: the line number will be displayed in the verbose prompt and in the = command, and the v command will pass the current line number to the editor (see also the discussion of LESSEDIT in PROMPTS below). .IP "\-N or \-\-LINE-NUMBERS" Causes a line number to be displayed at the beginning of each line in the display. .IP "\-o\fIfilename\fP or \-\-log-file=\fIfilename\fP" Causes .B less to copy its input to the named file as it is being viewed. This applies only when the input file is a pipe, not an ordinary file. If the file already exists, .B less will ask for confirmation before overwriting it. .IP "\-O\fIfilename\fP or \-\-LOG-FILE=\fIfilename\fP" The \-O option is like \-o, but it will overwrite an existing file without asking for confirmation. .sp If no log file has been specified, the \-o and \-O options can be used from within .B less to specify a log file. Without a file name, they will simply report the name of the log file. The "s" command is equivalent to specifying \-o from within .BR less . .IP "\-p\fIpattern\fP or \-\-pattern=\fIpattern\fP" The \-p option on the command line is equivalent to specifying +/\fIpattern\fP; that is, it tells .B less to start at the first occurrence of \fIpattern\fP in the file. .IP "\-P\fIprompt\fP or \-\-prompt=\fIprompt\fP" Provides a way to tailor the three prompt styles to your own preference. This option would normally be put in the LESS environment variable, rather than being typed in with each .B less command. Such an option must either be the last option in the LESS variable, or be terminated by a dollar sign. \-Ps followed by a string changes the default (short) prompt to that string. \-Pm changes the medium (\-m) prompt. \-PM changes the long (\-M) prompt. \-Ph changes the prompt for the help screen. \-P= changes the message printed by the = command. \-Pw changes the message printed while waiting for data (in the "F" command). .sp 1 All prompt strings consist of a sequence of letters and special escape sequences. See the section on PROMPTS for more details. .IP "\-q or \-\-quiet or \-\-silent" Causes moderately "quiet" operation: the terminal bell is not rung if an attempt is made to scroll past the end of the file or before the beginning of the file. If the terminal has a "visual bell", it is used instead. The bell will be rung on certain other errors, such as typing an invalid character. The default is to ring the terminal bell in all such cases. .IP "\-Q or \-\-QUIET or \-\-SILENT" Causes totally "quiet" operation: the terminal bell is never rung. If the terminal has a "visual bell", it is used in all cases where the terminal bell would have been rung. .IP "\-r or \-\-raw-control-chars" Causes "raw" control characters to be displayed. The default is to display control characters using the caret notation; for example, a control-A (octal 001) is displayed as "\(haA" (with some exceptions as described under the \-U option). Warning: when the \-r option is used, .B less cannot keep track of the actual appearance of the screen (since this depends on how the screen responds to each type of control character). Thus, various display problems may result, such as long lines being split in the wrong place. .sp USE OF THE \-r OPTION IS NOT RECOMMENDED. .IP "\-R or \-\-RAW-CONTROL-CHARS" Like \-r, but only ANSI "color" escape sequences and OSC 8 hyperlink sequences are output in "raw" form. Unlike \-r, the screen appearance is maintained correctly, provided that there are no escape sequences in the file other than these types of escape sequences. Color escape sequences are only supported when the color is changed within one line, not across lines. In other words, the beginning of each line is assumed to be normal (non-colored), regardless of any escape sequences in previous lines. For the purpose of keeping track of screen appearance, these escape sequences are assumed to not move the cursor. .sp OSC 8 hyperlinks are sequences of the form: .sp ESC ] 8 ; \&...\& \\7 .sp The terminating sequence may be either a BEL character (\\7) or the two-character sequence "ESC \\". .sp ANSI color escape sequences are sequences of the form: .sp ESC [ \&...\& m .sp where the "...\&" is zero or more color specification characters. You can make .B less think that characters other than "m" can end ANSI color escape sequences by setting the environment variable LESSANSIENDCHARS to the list of characters which can end a color escape sequence. And you can make .B less think that characters other than the standard ones may appear between the ESC and the m by setting the environment variable LESSANSIMIDCHARS to the list of characters which can appear. .IP "\-s or \-\-squeeze-blank-lines" Causes consecutive blank lines to be squeezed into a single blank line. This is useful when viewing .B nroff output. .IP "\-S or \-\-chop-long-lines" Causes lines longer than the screen width to be chopped (truncated) rather than wrapped. That is, the portion of a long line that does not fit in the screen width is not displayed until you press RIGHT-ARROW. The default is to wrap long lines; that is, display the remainder on the next line. See also the \-\-wordwrap option. .IP "\-t\fItag\fP or \-\-tag=\fItag\fP" The \-t option, followed immediately by a TAG, will edit the file containing that tag. For this to work, tag information must be available; for example, there may be a file in the current directory called "tags", which was previously built by .BR ctags (1) or an equivalent command. If the environment variable LESSGLOBALTAGS is set, it is taken to be the name of a command compatible with .BR global (1), and that command is executed to find the tag. (See .nh http://www.gnu.org/software/global/global.html). .hy The \-t option may also be specified from within .B less (using the \- command) as a way of examining a new file. The command ":t" is equivalent to specifying \-t from within .BR less . .IP "\-T\fItagsfile\fP or \-\-tag-file=\fItagsfile\fP" Specifies a tags file to be used instead of "tags". .IP "\-u or \-\-underline-special" Causes backspaces and carriage returns to be treated as printable characters; that is, they are sent to the terminal when they appear in the input. .IP "\-U or \-\-UNDERLINE-SPECIAL" Causes backspaces, tabs, carriage returns and "formatting characters" (as defined by Unicode) to be treated as control characters; that is, they are handled as specified by the \-r option. .sp By default, if neither \-u nor \-U is given, backspaces which appear adjacent to an underscore character are treated specially: the underlined text is displayed using the terminal's hardware underlining capability. Also, backspaces which appear between two identical characters are treated specially: the overstruck text is printed using the terminal's hardware boldface capability. Other backspaces are deleted, along with the preceding character. Carriage returns immediately followed by a newline are deleted. Other carriage returns are handled as specified by the \-r option. Unicode formatting characters, such as the Byte Order Mark, are sent to the terminal. Text which is overstruck or underlined can be searched for if neither \-u nor \-U is in effect. .sp See also the \-\-proc-backspace, \-\-proc-tab, and \-\-proc-return options. .IP "\-V or \-\-version" Displays the version number of .BR less . .IP "\-w or \-\-hilite-unread" Temporarily highlights the first "new" line after a forward movement of a full page. The first "new" line is the line immediately following the line previously at the bottom of the screen. Also highlights the target line after a g or p command. The highlight is removed at the next command which causes movement. If the \-\-status-line option is in effect, the entire line (the width of the screen) is highlighted. Otherwise, only the text in the line is highlighted, unless the \-J option is in effect, in which case only the status column is highlighted. .IP "\-W or \-\-HILITE-UNREAD" Like \-w, but temporarily highlights the first new line after any forward movement command larger than one line. .IP "\-x\fIn\fP,...\& or \-\-tabs=\fIn\fP,..." Sets tab stops. If only one \fIn\fP is specified, tab stops are set at multiples of \fIn\fP. If multiple values separated by commas are specified, tab stops are set at those positions, and then continue with the same spacing as the last two. For example, "-x9,17" will set tabs at positions 9, 17, 25, 33, etc. The default for \fIn\fP is 8. .IP "\-X or \-\-no-init" Disables sending the termcap initialization and deinitialization strings to the terminal. This is sometimes desirable if the deinitialization string does something unnecessary, like clearing the screen. .IP "\-y\fIn\fP or \-\-max-forw-scroll=\fIn\fP" Specifies a maximum number of lines to scroll forward. If it is necessary to scroll forward more than \fIn\fP lines, the screen is repainted instead. The \-c or \-C option may be used to repaint from the top of the screen if desired. By default, any forward movement causes scrolling. .IP "\-z\fIn\fP or \-\-window=\fIn\fP or \-\fIn\fP" Changes the default scrolling window size to \fIn\fP lines. The default is one screenful. The z and w commands can also be used to change the window size. The "z" may be omitted for compatibility with some versions of .BR more (1). If the number .I n is negative, it indicates .I n lines less than the current screen size. For example, if the screen is 24 lines, \fI\-z\-4\fP sets the scrolling window to 20 lines. If the screen is resized to 40 lines, the scrolling window automatically changes to 36 lines. .IP "\-\(dq\fIcc\fP\ or\ \-\-quotes=\fIcc\fP" Changes the filename quoting character. This may be necessary if you are trying to name a file which contains both spaces and quote characters. Followed by a single character, this changes the quote character to that character. Filenames containing a space should then be surrounded by that character rather than by double quotes. Followed by two characters, changes the open quote to the first character, and the close quote to the second character. Filenames containing a space should then be preceded by the open quote character and followed by the close quote character. Note that even after the quote characters are changed, this option remains \-" (a dash followed by a double quote). .IP "\-\(ti or \-\-tilde" Normally lines after end of file are displayed as a single tilde (\(ti). This option causes lines after end of file to be displayed as blank lines. .IP "\-# or \-\-shift" Specifies the default number of positions to scroll horizontally in the RIGHTARROW and LEFTARROW commands. If the number specified is zero, it sets the default number of positions to one half of the screen width. Alternately, the number may be specified as a fraction of the width of the screen, starting with a decimal point: \&.5 is half of the screen width, \&.3 is three tenths of the screen width, and so on. If the number is specified as a fraction, the actual number of scroll positions is recalculated if the terminal window is resized. .IP "\-\-exit-follow-on-close" When using the "F" command on a pipe, .B less will automatically stop waiting for more data when the input side of the pipe is closed. .IP "\-\-file-size" If \-\-file-size is specified, .B less will determine the size of the file immediately after opening the file. Then the "=" command will display the number of lines in the file. Normally this is not done, because it can be slow if the input file is non-seekable (such as a pipe) and is large. .IP "\-\-follow-name" Normally, if the input file is renamed while an F command is executing, .B less will continue to display the contents of the original file despite its name change. If \-\-follow-name is specified, during an F command .B less will periodically attempt to reopen the file by name. If the reopen succeeds and the file is a different file from the original (which means that a new file has been created with the same name as the original (now renamed) file), .B less will display the contents of that new file. .IP "\-\-header=\fIN[,M]\fP" Sets the number of header lines and columns displayed on the screen. The value may be of the form "N,M" where N and M are integers, to set the header lines to N and the header columns to M, or it may be a single integer "N" which sets the header lines to N and the header columns to zero, or it may be ",M" which sets the header columns to M and the header lines to zero. When N is nonzero, the first N lines at the top of the screen are replaced with the first N lines of the file, regardless of what part of the file are being viewed. When M is nonzero, the characters displayed at the beginning of each line are replaced with the first M characters of the line, even if the rest of the line is scrolled horizontally. If either N or M is zero, .B less stops displaying header lines or columns, respectively. (Note that it may be necessary to change the setting of the \-j option to ensure that the target line is not obscured by the header line(s).) .IP "\-\-incsearch" Subsequent search commands will be "incremental"; that is, .B less will advance to the next line containing the search pattern as each character of the pattern is typed in. .IP "\-\-intr=\fIc\fP" Use the character \fIc\fP instead of \(haX to interrupt a read when the "Waiting for data" message is displayed. \fIc\fP must be an ASCII character; that is, one with a value between 1 and 127 inclusive. A caret followed by a single character can be used to specify a control character. .IP "\-\-line-num-width=\fIn\fP" Sets the minimum width of the line number field when the \-N option is in effect to \fIn\fP characters. The default is 7. .IP "\-\-modelines=\fIn\fP" .RS Before displaying a file, .B less will read the first \fIn\fP lines to try to find a vim-compatible .IR modeline . If \fIn\fP is zero, .B less does not try to find modelines. By using a modeline, the file itself can specify the tab stops that should be used when viewing it. .PP A modeline contains, anywhere in the line, a program name ("vi", "vim", "ex", or "less"), followed by a colon, possibly followed by the word "set", and finally followed by zero or more option settings. If the word "set" is used, option settings are separated by spaces, and end at the first colon. If the word "set" is not used, option settings may be separated by either spaces or colons. The word "set" is required if the program name is "less" but optional if any of the other three names are used. If any option setting is of the form "tabstop=\fIn\fP" or "ts=\fIn\fP", then tab stops are automatically set as if \-\-tabs=\fIn\fP had been given. See the \-\-tabs description for acceptable values of \fIn\fP. .RE .IP "\-\-mouse" Enables mouse input: scrolling the mouse wheel down moves forward in the file, scrolling the mouse wheel up moves backwards in the file, and clicking the mouse sets the "#" mark to the line where the mouse is clicked. The number of lines to scroll when the wheel is moved can be set by the \-\-wheel-lines option. Mouse input works only on terminals which support X11 mouse reporting, and on the Windows version of .BR less . .IP "\-\-MOUSE" Like \-\-mouse, except the direction scrolled on mouse wheel movement is reversed. .IP "\-\-no-keypad" Disables sending the keypad initialization and deinitialization strings to the terminal. This is sometimes useful if the keypad strings make the numeric keypad behave in an undesirable manner. .IP "\-\-no-histdups" This option changes the behavior so that if a search string or file name is typed in, and the same string is already in the history list, the existing copy is removed from the history list before the new one is added. Thus, a given string will appear only once in the history list. Normally, a string may appear multiple times. .IP "\-\-no-number-headers" Header lines (defined via the \-\-header option) are not assigned line numbers. Line number 1 is assigned to the first line after any header lines. .IP "\-\-no-search-headers" Searches do not include header lines or header columns. .IP "\-\-no-vbell" Disables the terminal's visual bell. .IP "\-\-proc-backspace" If set, backspaces are handled as if neither the \-u option nor the \-U option were set. That is, a backspace adjacent to an underscore causes text to be displayed in underline mode, and a backspace between identical characters cause text to be displayed in boldface mode. This option overrides the \-u and \-U options, so that display of backspaces can be controlled separate from tabs and carriage returns. If not set, backspace display is controlled by the \-u and \-U options. .IP "\-\-PROC-BACKSPACE" If set, backspaces are handled as if the \-U option were set; that is backspaces are treated as control characters. .IP "\-\-proc-return" If set, carriage returns are handled as if neither the \-u option nor the \-U option were set. That is, a carriage return immediately before a newline is deleted. This option overrides the \-u and \-U options, so that display of carriage returns can be controlled separate from that of backspaces and tabs. If not set, carriage return display is controlled by the \-u and \-U options. .IP "\-\-PROC-RETURN" If set, carriage returns are handled as if the \-U option were set; that is carriage returns are treated as control characters. .IP "\-\-proc-tab" If set, tabs are handled as if the \-U option were not set. That is, tabs are expanded to spaces. This option overrides the \-U option, so that display of tabs can be controlled separate from that of backspaces and carriage returns. If not set, tab display is controlled by the \-U options. .IP "\-\-PROC-TAB" If set, tabs are handled as if the \-U option were set; that is tabs are treated as control characters. .IP "\-\-redraw-on-quit" When quitting, after sending the terminal deinitialization string, redraws the entire last screen. On terminals whose terminal deinitialization string causes the terminal to switch from an alternate screen, this makes the last screenful of the current file remain visible after .B less has quit. .IP "\-\-rscroll=\fIc\fP" This option changes the character used to mark truncated lines. It may begin with a two-character attribute indicator like LESSBINFMT does. If there is no attribute indicator, standout is used. If set to "\-", truncated lines are not marked. .IP "\-\-save-marks" Save marks in the history file, so marks are retained across different invocations of .BR less . .IP "\-\-search-options=\fI...\fP" Sets default search modifiers. The value is a string of one or more of the characters E, F, K, N, R or W. Setting any of these has the same effect as typing that control character at the beginning of every search pattern. For example, setting \-\-search-options=W is the same as typing \(haW at the beginning of every pattern. The value may also contain a digit between 1 and 5, which has the same effect as typing \(haS followed by that digit at the beginning of every search pattern. The value "-" disables all default search modifiers. .IP "\-\-show-preproc-errors" If a preprocessor produces data, then exits with a non-zero exit code, .B less will display a warning. .IP "\-\-status-col-width=\fIn\fP" Sets the width of the status column when the \-J option is in effect. The default is 2 characters. .IP "\-\-status-line" If a line is marked, the entire line (rather than just the status column) is highlighted. Also lines highlighted due to the \-w option will have the entire line highlighted. If \-\-use-color is set, the line is colored rather than highlighted. .IP "\-\-use-backslash" This option changes the interpretations of options which follow this one. After the \-\-use-backslash option, any backslash in an option string is removed and the following character is taken literally. This allows a dollar sign to be included in option strings. .IP "\-\-use-color" Enables colored text in various places. The \-D option can be used to change the colors. Colored text works only if the terminal supports ANSI color escape sequences (as defined in ECMA-48 SGR; see .br .nh https://www.ecma-international.org/publications-and-standards/standards/ecma-48). .hy .IP "\-\-wheel-lines=\fIn\fP" Set the number of lines to scroll when the mouse wheel is scrolled and the \-\-mouse or \-\-MOUSE option is in effect. The default is 1 line. .IP "\-\-wordwrap" When the \-S option is not in use, wrap each line at a space or tab if possible, so that a word is not split between two lines. The default is to wrap at any character. .IP \-\- A command line argument of "\-\-" marks the end of option arguments. Any arguments following this are interpreted as filenames. This can be useful when viewing a file whose name begins with a "\-" or "+". .IP + If a command line option begins with \fB+\fP, the remainder of that option is taken to be an initial command to .BR less . For example, +G tells .B less to start at the end of the file rather than the beginning, and +/xyz tells it to start at the first occurrence of "xyz" in the file. As a special case, + acts like +g; that is, it starts the display at the specified line number (however, see the caveat under the "g" command above). If the option starts with ++, the initial command applies to every file being viewed, not just the first one. The + command described previously may also be used to set (or change) an initial command for every file. . .SH "LINE EDITING" When entering a command line at the bottom of the screen (for example, a filename for the :e command, or the pattern for a search command), certain keys can be used to manipulate the command line. Most commands have an alternate form in [ brackets ] which can be used if a key does not exist on a particular keyboard. (Note that the forms beginning with ESC do not work in some MS-DOS and Windows systems because ESC is the line erase character.) Any of these special keys may be entered literally by preceding it with the "literal" character, either \(haV or \(haA. A backslash itself may also be entered literally by entering two backslashes. .IP "LEFTARROW [ ESC-h ]" Move the cursor one space to the left. .IP "RIGHTARROW [ ESC-l ]" Move the cursor one space to the right. .IP "\(haLEFTARROW [ ESC-b or ESC-LEFTARROW ]" (That is, CONTROL and LEFTARROW simultaneously.) Move the cursor one word to the left. .IP "\(haRIGHTARROW [ ESC-w or ESC-RIGHTARROW ]" (That is, CONTROL and RIGHTARROW simultaneously.) Move the cursor one word to the right. .IP "HOME [ ESC-0 ]" Move the cursor to the beginning of the line. .IP "END [ ESC-$ ]" Move the cursor to the end of the line. .IP "BACKSPACE" Delete the character to the left of the cursor, or cancel the command if the command line is empty. .IP "DELETE or [ ESC-x ]" Delete the character under the cursor. .IP "\(haBACKSPACE [ ESC-BACKSPACE ]" (That is, CONTROL and BACKSPACE simultaneously.) Delete the word to the left of the cursor. .IP "\(haDELETE [ ESC-X or ESC-DELETE ]" (That is, CONTROL and DELETE simultaneously.) Delete the word under the cursor. .IP "UPARROW [ ESC-k ]" Retrieve the previous command line. If you first enter some text and then press UPARROW, it will retrieve the previous command which begins with that text. .IP "DOWNARROW [ ESC-j ]" Retrieve the next command line. If you first enter some text and then press DOWNARROW, it will retrieve the next command which begins with that text. .IP "TAB" Complete the partial filename to the left of the cursor. If it matches more than one filename, the first match is entered into the command line. Repeated TABs will cycle thru the other matching filenames. If the completed filename is a directory, a "/" is appended to the filename. (On MS-DOS systems, a "\e" is appended.) The environment variable LESSSEPARATOR can be used to specify a different character to append to a directory name. .IP "BACKTAB [ ESC-TAB ]" Like, TAB, but cycles in the reverse direction thru the matching filenames. .IP "\(haL" Complete the partial filename to the left of the cursor. If it matches more than one filename, all matches are entered into the command line (if they fit). .IP "\(haU (Unix and OS/2) or ESC (MS-DOS)" Delete the entire command line, or cancel the command if the command line is empty. If you have changed your line-kill character in Unix to something other than \(haU, that character is used instead of \(haU. .IP "\(haG" Delete the entire command line and return to the main prompt. . .SH "KEY BINDINGS" You may define your own .B less commands by creating a lesskey source file. This file specifies a set of command keys and an action associated with each key. You may also change the line-editing keys (see LINE EDITING), and set environment variables used by .BR less . See the .BR lesskey (1) manual page for details about the file format. .PP If the environment variable LESSKEYIN is set, .B less uses that as the name of the lesskey source file. Otherwise, .B less looks in a standard place for the lesskey source file: On Unix systems, .B less looks for a lesskey file called "$XDG_CONFIG_HOME/lesskey" or "$HOME/.config/lesskey" or "$HOME/.lesskey". On MS-DOS and Windows systems, .B less looks for a lesskey file called "$HOME/_lesskey", and if it is not found there, then looks for a lesskey file called "_lesskey" in any directory specified in the PATH environment variable. On OS/2 systems, .B less looks for a lesskey file called "$HOME/lesskey.ini", and if it is not found, then looks for a lesskey file called "lesskey.ini" in any directory specified in the INIT environment variable, and if it not found there, then looks for a lesskey file called "lesskey.ini" in any directory specified in the PATH environment variable. .PP A system-wide lesskey source file may also be set up to provide key bindings. If a key is defined in both a local lesskey file and in the system-wide file, key bindings in the local file take precedence over those in the system-wide file. If the environment variable LESSKEYIN_SYSTEM is set, .B less uses that as the name of the system-wide lesskey file. Otherwise, .B less looks in a standard place for the system-wide lesskey file: On Unix systems, the system-wide lesskey file is /usr/local/etc/syslesskey. (However, if .B less was built with a different sysconf directory than /usr/local/etc, that directory is where the sysless file is found.) On MS-DOS and Windows systems, the system-wide lesskey file is c:\e_syslesskey. On OS/2 systems, the system-wide lesskey file is c:\esyslesskey.ini. .PP Previous versions of .B less (before v582) used lesskey files with a binary format, produced by the .B lesskey program. It is no longer necessary to use the .B lesskey program. . .SH "INPUT PREPROCESSOR" You may define an "input preprocessor" for .BR less . Before .B less opens a file, it first gives your input preprocessor a chance to modify the way the contents of the file are displayed. An input preprocessor is simply an executable program (or shell script), which writes the contents of the file to a different file, called the replacement file. The contents of the replacement file are then displayed in place of the contents of the original file. However, it will appear to the user as if the original file is opened; that is, .B less will display the original filename as the name of the current file. .PP An input preprocessor receives one command line argument, the original filename, as entered by the user. It should create the replacement file, and when finished, print the name of the replacement file to its standard output. If the input preprocessor does not output a replacement filename, .B less uses the original file, as normal. The input preprocessor is not called when viewing standard input. To set up an input preprocessor, set the LESSOPEN environment variable to a command line which will invoke your input preprocessor. This command line should include one occurrence of the string "%s", which will be replaced by the filename when the input preprocessor command is invoked. .PP When .B less closes a file opened in such a way, it will call another program, called the input postprocessor, which may perform any desired clean-up action (such as deleting the replacement file created by LESSOPEN). This program receives two command line arguments, the original filename as entered by the user, and the name of the replacement file. To set up an input postprocessor, set the LESSCLOSE environment variable to a command line which will invoke your input postprocessor. It may include two occurrences of the string "%s"; the first is replaced with the original name of the file and the second with the name of the replacement file, which was output by LESSOPEN. .PP For example, on many Unix systems, these two scripts will allow you to keep files in compressed format, but still let .B less view them directly: .PP lessopen.sh: .br #! /bin/sh .br case "$1" in .br *.Z) TEMPFILE=$(mktemp) .br uncompress \-c $1 >$TEMPFILE 2>/dev/null .br if [ \-s $TEMPFILE ]; then .br echo $TEMPFILE .br else .br rm \-f $TEMPFILE .br fi .br ;; .br esac .PP lessclose.sh: .br #! /bin/sh .br rm $2 .PP To use these scripts, put them both where they can be executed and set LESSOPEN="lessopen.sh\ %s", and LESSCLOSE="lessclose.sh\ %s\ %s". More complex LESSOPEN and LESSCLOSE scripts may be written to accept other types of compressed files, and so on. .PP It is also possible to set up an input preprocessor to pipe the file data directly to .BR less , rather than putting the data into a replacement file. This avoids the need to decompress the entire file before starting to view it. An input preprocessor that works this way is called an input pipe. An input pipe, instead of writing the name of a replacement file on its standard output, writes the entire contents of the replacement file on its standard output. If the input pipe does not write any characters on its standard output, then there is no replacement file and .B less uses the original file, as normal. To use an input pipe, make the first character in the LESSOPEN environment variable a vertical bar (|) to signify that the input preprocessor is an input pipe. As with non-pipe input preprocessors, the command string must contain one occurrence of %s, which is replaced with the filename of the input file. .PP For example, on many Unix systems, this script will work like the previous example scripts: .PP lesspipe.sh: .br #! /bin/sh .br case "$1" in .br *.Z) uncompress \-c $1 2>/dev/null .br ;; .br *) exit 1 .br ;; .br esac .br exit $? .br .PP To use this script, put it where it can be executed and set LESSOPEN="|lesspipe.sh %s". .PP Note that a preprocessor cannot output an empty file, since that is interpreted as meaning there is no replacement, and the original file is used. To avoid this, if LESSOPEN starts with two vertical bars, the exit status of the script determines the behavior when the output is empty. If the output is empty and the exit status is zero, the empty output is considered to be replacement text. If the output is empty and the exit status is nonzero, the original file is used. For compatibility with previous versions of .BR less , if LESSOPEN starts with only one vertical bar, the exit status of the preprocessor is ignored. .PP When an input pipe is used, a LESSCLOSE postprocessor can be used, but it is usually not necessary since there is no replacement file to clean up. In this case, the replacement file name passed to the LESSCLOSE postprocessor is "\-". .PP For compatibility with previous versions of .BR less , the input preprocessor or pipe is not used if .B less is viewing standard input. However, if the first character of LESSOPEN is a dash (\-), the input preprocessor is used on standard input as well as other files. In this case, the dash is not considered to be part of the preprocessor command. If standard input is being viewed, the input preprocessor is passed a file name consisting of a single dash. Similarly, if the first two characters of LESSOPEN are vertical bar and dash (|\-) or two vertical bars and a dash (||\-), the input pipe is used on standard input as well as other files. Again, in this case the dash is not considered to be part of the input pipe command. . .SH "NATIONAL CHARACTER SETS" There are three types of characters in the input file: .IP "normal characters" can be displayed directly to the screen. .IP "control characters" should not be displayed directly, but are expected to be found in ordinary text files (such as backspace and tab). .IP "binary characters" should not be displayed directly and are not expected to be found in text files. .PP A "character set" is simply a description of which characters are to be considered normal, control, and binary. The LESSCHARSET environment variable may be used to select a character set. Possible values for LESSCHARSET are: .IP ascii BS, TAB, NL, CR, and formfeed are control characters, all chars with values between 32 and 126 are normal, and all others are binary. .IP iso8859 Selects an ISO 8859 character set. This is the same as ASCII, except characters between 160 and 255 are treated as normal characters. .IP latin1 Same as iso8859. .IP latin9 Same as iso8859. .IP dos Selects a character set appropriate for MS-DOS. .IP ebcdic Selects an EBCDIC character set. .IP IBM-1047 Selects an EBCDIC character set used by OS/390 Unix Services. This is the EBCDIC analogue of latin1. You get similar results by setting either LESSCHARSET=IBM-1047 or LC_CTYPE=en_US in your environment. .IP koi8-r Selects a Russian character set. .IP next Selects a character set appropriate for NeXT computers. .IP utf-8 Selects the UTF-8 encoding of the ISO 10646 character set. UTF-8 is special in that it supports multi-byte characters in the input file. It is the only character set that supports multi-byte characters. .IP windows Selects a character set appropriate for Microsoft Windows (cp 1251). .PP In rare cases, it may be desired to tailor .B less to use a character set other than the ones definable by LESSCHARSET. In this case, the environment variable LESSCHARDEF can be used to define a character set. It should be set to a string where each character in the string represents one character in the character set. The character ".\&" is used for a normal character, "c" for control, and "b" for binary. A decimal number may be used for repetition. For example, "bccc4b.\&" would mean character 0 is binary, 1, 2 and 3 are control, 4, 5, 6 and 7 are binary, and 8 is normal. All characters after the last are taken to be the same as the last, so characters 9 through 255 would be normal. (This is an example, and does not necessarily represent any real character set.) .PP This table shows the value of LESSCHARDEF which is equivalent to each of the possible values for LESSCHARSET: . .RS 5m .TS l l. ascii 8bcccbcc18b95.b dos 8bcccbcc12bc5b95.b. ebcdic 5bc6bcc7bcc41b.9b7.9b5.b..8b6.10b6.b9.7b 9.8b8.17b3.3b9.7b9.8b8.6b10.b.b.b. IBM-1047 4cbcbc3b9cbccbccbb4c6bcc5b3cbbc4bc4bccbc 191.b iso8859 8bcccbcc18b95.33b. koi8-r 8bcccbcc18b95.b128. latin1 8bcccbcc18b95.33b. next 8bcccbcc18b95.bb125.bb .TE .RE .PP If neither LESSCHARSET nor LESSCHARDEF is set, but any of the strings "UTF-8", "UTF8", "utf-8" or "utf8" is found in the LC_ALL, LC_CTYPE or LANG environment variables, then the default character set is utf-8. .PP If that string is not found, but your system supports the .B setlocale interface, .B less will use setlocale to determine the character set. setlocale is controlled by setting the LANG or LC_CTYPE environment variables. .PP Finally, if the .I setlocale interface is also not available, the default character set is latin1. .PP Control and binary characters are displayed in standout (reverse video). Each such character is displayed in caret notation if possible (e.g.\& \(haA for control-A). Caret notation is used only if inverting the 0100 bit results in a normal printable character. Otherwise, the character is displayed as a hex number in angle brackets. This format can be changed by setting the LESSBINFMT environment variable. LESSBINFMT may begin with a "*" and one character to select the display attribute: "*k" is blinking, "*d" is bold, "*u" is underlined, "*s" is standout, and "*n" is normal. If LESSBINFMT does not begin with a "*", normal attribute is assumed. The remainder of LESSBINFMT is a string which may include one printf-style escape sequence (a % followed by x, X, o, d, etc.). For example, if LESSBINFMT is "*u[%x]", binary characters are displayed in underlined hexadecimal surrounded by brackets. The default if no LESSBINFMT is specified is "*s<%02X>". Warning: the result of expanding the character via LESSBINFMT must be less than 31 characters. .PP When the character set is utf-8, the LESSUTFBINFMT environment variable acts similarly to LESSBINFMT but it applies to Unicode code points that were successfully decoded but are unsuitable for display (e.g., unassigned code points). Its default value is "". Note that LESSUTFBINFMT and LESSBINFMT share their display attribute setting ("*x") so specifying one will affect both; LESSUTFBINFMT is read after LESSBINFMT so its setting, if any, will have priority. Problematic octets in a UTF-8 file (octets of a truncated sequence, octets of a complete but non-shortest form sequence, invalid octets, and stray trailing octets) are displayed individually using LESSBINFMT so as to facilitate diagnostic of how the UTF-8 file is ill-formed. .PP When the character set is utf-8, in rare cases it may be desirable to override the Unicode definition of the type of certain characters. For example, characters in a Private Use Area are normally treated as control characters, but if you are using a custom font with printable characters in that range, it may be desirable to tell .B less to treat such characters as printable. This can be done by setting the LESSUTFCHARDEF environment variable to a comma-separated list of .I "character type" definitions. Each character type definition consists of either one hexadecimal codepoint or a pair of codepoints separated by a dash, followed by a colon and a type character. Each hexadecimal codepoint may optionally be preceded by a "U" or "U+". If a pair of codepoints is given, the type is set for all characters inclusively between the two values. If there are multiple comma-separated codepoint values, they must be in ascending numerical order. The type character may be one of: .RS .IP "p" A normal printable character. .IP "w" A wide (2-space) printable character. .IP "b" A binary (non-printable) character. .IP "c" A composing (zero width) character. .RE .PP For example, setting LESSUTFCHARDEF to .nf .sp E000-F8FF:p,F0000-FFFFD:p,100000-10FFFD:p .sp .fi would make all Private Use Area characters be treated as printable. .SH "PROMPTS" The \-P option allows you to tailor the prompt to your preference. The string given to the \-P option replaces the specified prompt string. Certain characters in the string are interpreted specially. The prompt mechanism is rather complicated to provide flexibility, but the ordinary user need not understand the details of constructing personalized prompt strings. .sp A percent sign followed by a single character is expanded according to what the following character is. (References to the input file size below refer to the preprocessed size, if an input preprocessor is being used.) .IP "%b\fIX\fP" Replaced by the byte offset into the current input file. The b is followed by a single character (shown as \fIX\fP above) which specifies the line whose byte offset is to be used. If the character is a "t", the byte offset of the top line in the display is used, an "m" means use the middle line, a "b" means use the bottom line, a "B" means use the line just after the bottom line, and a "j" means use the "target" line, as specified by the \-j option. .IP "%B" Replaced by the size of the current input file. .IP "%c" Replaced by the column number of the text appearing in the first column of the screen. .IP "%d\fIX\fP" Replaced by the page number of a line in the input file. The line to be used is determined by the \fIX\fP, as with the %b option. .IP "%D" Replaced by the number of pages in the input file, or equivalently, the page number of the last line in the input file. .IP "%E" Replaced by the name of the editor (from the VISUAL environment variable, or the EDITOR environment variable if VISUAL is not defined). See the discussion of the LESSEDIT feature below. .IP "%f" Replaced by the name of the current input file. .IP "%F" Replaced by the last component of the name of the current input file. .IP "%g" Replaced by the shell-escaped name of the current input file. This is useful when the expanded string will be used in a shell command, such as in LESSEDIT. .IP "%i" Replaced by the index of the current file in the list of input files. .IP "%l\fIX\fP" Replaced by the line number of a line in the input file. The line to be used is determined by the \fIX\fP, as with the %b option. .IP "%L" Replaced by the line number of the last line in the input file. .IP "%m" Replaced by the total number of input files. .IP "%p\fIX\fP" Replaced by the percent into the current input file, based on byte offsets. The line used is determined by the \fIX\fP as with the %b option. .IP "%P\fIX\fP" Replaced by the percent into the current input file, based on line numbers. The line used is determined by the \fIX\fP as with the %b option. .IP "%s" Same as %B. .IP "%t" Causes any trailing spaces to be removed. Usually used at the end of the string, but may appear anywhere. .IP "%T" Normally expands to the word "file". However if viewing files via a tags list using the \-t option, it expands to the word "tag". .IP "%x" Replaced by the name of the next input file in the list. .PP If any item is unknown (for example, the file size if input is a pipe), a question mark is printed instead. .PP The format of the prompt string can be changed depending on certain conditions. A question mark followed by a single character acts like an "IF": depending on the following character, a condition is evaluated. If the condition is true, any characters following the question mark and condition character, up to a period, are included in the prompt. If the condition is false, such characters are not included. A colon appearing between the question mark and the period can be used to establish an "ELSE": any characters between the colon and the period are included in the string if and only if the IF condition is false. Condition characters (which follow a question mark) may be: .IP "?a" True if any characters have been included in the prompt so far. .IP "?b\fIX\fP" True if the byte offset of the specified line is known. .IP "?B" True if the size of current input file is known. .IP "?c" True if the text is horizontally shifted (%c is not zero). .IP "?d\fIX\fP" True if the page number of the specified line is known. .IP "?e" True if at end-of-file. .IP "?f" True if there is an input filename (that is, if input is not a pipe). .IP "?l\fIX\fP" True if the line number of the specified line is known. .IP "?L" True if the line number of the last line in the file is known. .IP "?m" True if there is more than one input file. .IP "?n" True if this is the first prompt in a new input file. .IP "?p\fIX\fP" True if the percent into the current input file, based on byte offsets, of the specified line is known. .IP "?P\fIX\fP" True if the percent into the current input file, based on line numbers, of the specified line is known. .IP "?s" Same as "?B". .IP "?x" True if there is a next input file (that is, if the current input file is not the last one). .PP Any characters other than the special ones (question mark, colon, period, percent, and backslash) become literally part of the prompt. Any of the special characters may be included in the prompt literally by preceding it with a backslash. .PP Some examples: .sp ?f%f:Standard input. .sp This prompt prints the filename, if known; otherwise the string "Standard input". .sp ?f%f \&.?ltLine %lt:?pt%pt\e%:?btByte %bt:-... .sp This prompt would print the filename, if known. The filename is followed by the line number, if known, otherwise the percent if known, otherwise the byte offset if known. Otherwise, a dash is printed. Notice how each question mark has a matching period, and how the % after the %pt is included literally by escaping it with a backslash. .sp ?n?f%f\ .?m(%T %i of %m)\ ..?e(END)\ ?x-\ Next\e:\ %x..%t"; .sp This prints the filename if this is the first prompt in a file, followed by the "file N of N" message if there is more than one input file. Then, if we are at end-of-file, the string "(END)" is printed followed by the name of the next file, if there is one. Finally, any trailing spaces are truncated. This is the default prompt. For reference, here are the defaults for the other two prompts (\-m and \-M respectively). Each is broken into two lines here for readability only. .nf .sp ?n?f%f\ .?m(%T\ %i\ of\ %m)\ ..?e(END)\ ?x-\ Next\e:\ %x.: ?pB%pB\e%:byte\ %bB?s/%s...%t .sp ?f%f\ .?n?m(%T\ %i\ of\ %m)\ ..?ltlines\ %lt-%lb?L/%L.\ : byte\ %bB?s/%s.\ .?e(END)\ ?x-\ Next\e:\ %x.:?pB%pB\e%..%t .sp .fi And here is the default message produced by the = command: .nf .sp ?f%f\ .?m(%T\ %i\ of\ %m)\ .?ltlines\ %lt-%lb?L/%L.\ . byte\ %bB?s/%s.\ ?e(END)\ :?pB%pB\e%..%t .fi .PP The prompt expansion features are also used for another purpose: if an environment variable LESSEDIT is defined, it is used as the command to be executed when the v command is invoked. The LESSEDIT string is expanded in the same way as the prompt strings. The default value for LESSEDIT is: .nf .sp %E\ ?lm+%lm.\ %g .sp .fi Note that this expands to the editor name, followed by a + and the line number, followed by the shell-escaped file name. If your editor does not accept the "+linenumber" syntax, or has other differences in invocation syntax, the LESSEDIT variable can be changed to modify this default. . .SH SECURITY When the environment variable LESSSECURE is set to 1, .B less runs in a "secure" mode. This means these features are disabled: .RS .IP "!" the shell command .IP "#" the pshell command .IP "|" the pipe command .IP ":e" the examine command. .IP "v" the editing command .IP "s \-o" log files .IP "\-k" use of lesskey files .IP "\-t" use of tags files .IP metacharacters in filenames, such as * .IP filename completion (TAB, \(haL) .IP history file .RE .PP Less can also be compiled to be permanently in "secure" mode. . .SH "COMPATIBILITY WITH MORE" If the environment variable LESS_IS_MORE is set to 1, or if the program is invoked via a file link named "more", .B less behaves (mostly) in conformance with the POSIX .BR more (1) command specification. In this mode, less behaves differently in these ways: .PP The \-e option works differently. If the \-e option is not set, .B less behaves as if the \-e option were set. If the \-e option is set, .B less behaves as if the \-E option were set. .PP The \-m option works differently. If the \-m option is not set, the medium prompt is used, and it is prefixed with the string "\-\-More\-\-". If the \-m option is set, the short prompt is used. .PP The \-n option acts like the \-z option. The normal behavior of the \-n option is unavailable in this mode. .PP The parameter to the \-p option is taken to be a .B less command rather than a search pattern. .PP The LESS environment variable is ignored, and the MORE environment variable is used in its place. . .SH "ENVIRONMENT VARIABLES" Environment variables may be specified either in the system environment as usual, or in a .BR lesskey (1) file. If environment variables are defined in more than one place, variables defined in a local lesskey file take precedence over variables defined in the system environment, which take precedence over variables defined in the system-wide lesskey file. .IP COLUMNS Sets the number of columns on the screen. Takes precedence over the number of columns specified by the TERM variable. (But if you have a windowing system which supports TIOCGWINSZ or WIOCGETD, the window system's idea of the screen size takes precedence over the LINES and COLUMNS environment variables.) .IP EDITOR The name of the editor (used for the v command). .IP HOME Name of the user's home directory (used to find a lesskey file on Unix and OS/2 systems). .IP "HOMEDRIVE, HOMEPATH" Concatenation of the HOMEDRIVE and HOMEPATH environment variables is the name of the user's home directory if the HOME variable is not set (only in the Windows version). .IP INIT Name of the user's init directory (used to find a lesskey file on OS/2 systems). .IP LANG Language for determining the character set. .IP LC_CTYPE Language for determining the character set. .IP LESS Options which are passed to .B less automatically. .IP LESSANSIENDCHARS Characters which may end an ANSI color escape sequence (default "m"). .IP LESSANSIMIDCHARS Characters which may appear between the ESC character and the end character in an ANSI color escape sequence (default "0123456789:;[?!"\(aq#%()*+\ ". .IP LESSBINFMT Format for displaying non-printable, non-control characters. .IP LESSCHARDEF Defines a character set. .IP LESSCHARSET Selects a predefined character set. .IP LESSCLOSE Command line to invoke the (optional) input-postprocessor. .IP LESSECHO Name of the lessecho program (default "lessecho"). The lessecho program is needed to expand metacharacters, such as * and ?, in filenames on Unix systems. .IP LESSEDIT Editor prototype string (used for the v command). See discussion under PROMPTS. .IP LESSGLOBALTAGS Name of the command used by the \-t option to find global tags. Normally should be set to "global" if your system has the .BR global (1) command. If not set, global tags are not used. .IP LESSHISTFILE Name of the history file used to remember search commands and shell commands between invocations of .BR less . If set to "\-" or "/dev/null", a history file is not used. The default depends on the operating system, but is usually: .RS .IP "Linux and Unix" "$XDG_STATE_HOME/lesshst" or "$HOME/.local/state/lesshst" or "$XDG_DATA_HOME/lesshst" or "$HOME/.lesshst". .IP "Windows and MS-DOS" "$HOME/_lesshst". .IP "OS/2" "$HOME/lesshst.ini" or "$INIT/lesshst.ini". .RE .IP LESSHISTSIZE The maximum number of commands to save in the history file. The default is 100. .IP LESSKEYIN Name of the default .I "lesskey source" file. .IP LESSKEY Name of the default .I "lesskey binary" file. (Not used if "$LESSKEYIN" exists.) .IP LESSKEYIN_SYSTEM Name of the default system-wide .I "lesskey source" file. .IP LESSKEY_SYSTEM Name of the default system-wide .I "lesskey binary" file. (Not used if "$LESSKEYIN_SYSTEM" exists.) .IP LESSMETACHARS List of characters which are considered "metacharacters" by the shell. .IP LESSMETAESCAPE Prefix which less will add before each metacharacter in a command sent to the shell. If LESSMETAESCAPE is an empty string, commands containing metacharacters will not be passed to the shell. .IP LESSOPEN Command line to invoke the (optional) input-preprocessor. .IP LESSSECURE Runs less in "secure" mode. See discussion under SECURITY. .IP LESSSEPARATOR String to be appended to a directory name in filename completion. .IP LESSUTFBINFMT Format for displaying non-printable Unicode code points. .IP LESSUTFCHARDEF Overrides the type of specified Unicode characters. .IP LESS_COLUMNS Sets the number of columns on the screen. Unlike COLUMNS, takes precedence over the system's idea of the screen size, so it can be used to make .B less use less than the full screen width. If set to a negative number, sets the number of columns used to this much less than the actual screen width. .IP LESS_LINES Sets the number of lines on the screen. Unlike LINES, takes precedence over the system's idea of the screen size, so it can be used to make .B less use less than the full screen height. If set to a negative number, sets the number of lines used to this much less than the actual screen height. When set, .B less repaints the entire screen on every movement command, so scrolling may be slower. .IP LESS_DATA_DELAY Duration (in milliseconds) after starting to read data from the input, after which the "Waiting for data" message will be displayed. The default is 4000 (4 seconds). .IP LESS_IS_MORE Emulate the .BR more (1) command. .IP LESS_TERMCAP_xx Where "xx" is any two characters, overrides the definition of the termcap "xx" capability for the terminal. .IP LINES Sets the number of lines on the screen. Takes precedence over the number of lines specified by the TERM variable. (But if you have a windowing system which supports TIOCGWINSZ or WIOCGETD, the window system's idea of the screen size takes precedence over the LINES and COLUMNS environment variables.) .IP MORE Options which are passed to .B less automatically when running in .BR more "-compatible mode." .IP PATH User's search path (used to find a lesskey file on MS-DOS and OS/2 systems). .IP SHELL The shell used to execute the !\& command, as well as to expand filenames. .IP TERM The type of terminal on which .B less is being run. .IP VISUAL The name of the editor (used for the v command). .IP XDG_CONFIG_HOME Possible location of the .B lesskey file; see the KEY BINDINGS section. .IP XDG_DATA_HOME Possible location of the history file; see the description of the LESSHISTFILE environment variable. .IP XDG_STATE_HOME Possible location of the history file; see the description of the LESSHISTFILE environment variable. . .SH "SEE ALSO" .BR lesskey (1), .BR lessecho (1) . .SH COPYRIGHT Copyright (C) 1984-2023 Mark Nudelman .PP less is part of the GNU project and is free software. You can redistribute it and/or modify it under the terms of either (1) the GNU General Public License as published by the Free Software Foundation; or (2) the Less License. See the file README in the less distribution for more details regarding redistribution. You should have received a copy of the GNU General Public License along with the source for less; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. You should also have received a copy of the Less License; see the file LICENSE. .PP less is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. . .SH AUTHOR . Mark Nudelman .br Report bugs at https://github.com/gwsw/less/issues. .br For more information, see the less homepage at .br https://greenwoodsoftware.com/less diff --git a/contrib/less/lessecho.nro b/contrib/less/lessecho.nro index 6637cb947173..bd9c6b4f91c7 100644 --- a/contrib/less/lessecho.nro +++ b/contrib/less/lessecho.nro @@ -1,52 +1,52 @@ -.TH LESSECHO 1 "Version 632: 06 Apr 2023" +.TH LESSECHO 1 "Version 643: 20 Jul 2023" .SH NAME lessecho \- expand metacharacters .SH SYNOPSIS .B lessecho .I "[-ox] [-cx] [-pn] [-dn] [-mx] [-nn] [-ex] [-a] file ..." .SH "DESCRIPTION" .B lessecho is a program that simply echos its arguments on standard output. But any metacharacter in the output is preceded by an "escape" character, which by default is a backslash. .SH OPTIONS A summary of options is included below. .TP .B \-e\fIx\fP Specifies "\fIx\fP", rather than backslash, to be the escape char for metachars. If \fIx\fP is "-", no escape char is used and arguments containing metachars are surrounded by quotes instead. .TP .B \-o\fIx\fP Specifies "\fIx\fP", rather than double-quote, to be the open quote character, which is used if the \-e- option is specified. .TP .B \-c\fIx\fP Specifies "\fIx\fP" to be the close quote character. .TP .B \-p\fIn\fP Specifies "\fIn\fP" to be the open quote character, as an integer. .TP .B \-d\fIn\fP Specifies "\fIn\fP" to be the close quote character, as an integer. .TP .B \-m\fIx\fP Specifies "\fIx\fP" to be a metachar. By default, no characters are considered metachars. .TP .B \-n\fIn\fP Specifies "\fIn\fP" to be a metachar, as an integer. .TP .B \-f\fIn\fP Specifies "\fIn\fP" to be the escape char for metachars, as an integer. .TP .B \-a Specifies that all arguments are to be quoted. The default is that only arguments containing metacharacters are quoted. .SH "SEE ALSO" .BR less (1) .SH AUTHOR This manual page was written by Thomas Schoepf , for the Debian GNU/Linux system (but may be used by others). .PP Report bugs at https://github.com/gwsw/less/issues. diff --git a/contrib/less/lesskey.nro b/contrib/less/lesskey.nro index 2f7c4864dc2f..324710547a3e 100644 --- a/contrib/less/lesskey.nro +++ b/contrib/less/lesskey.nro @@ -1,451 +1,458 @@ '\" t -.TH LESSKEY 1 "Version 632: 06 Apr 2023" +.TH LESSKEY 1 "Version 643: 20 Jul 2023" .SH NAME lesskey \- customize key bindings for less .SH "SYNOPSIS (deprecated)" .B "lesskey [\-o output] [\-\-] [input]" .br .B "lesskey [\-\-output=output] [\-\-] [input]" .br .B "lesskey \-V" .br .B "lesskey \-\-version" .SH SCOPE This document describes the format of the .B lesskey source file, which is used by .B less version 582 and later. In previous versions of .BR less , a separate program called .B lesskey was used to compile the .B lesskey source file into a format understood by .BR less . This compilation step is no longer required and the .B lesskey program is therefore deprecated, although the file format remains supported by .B less itself. .PP .SH DESCRIPTION A .B lesskey file specifies a set of key bindings and environment variables to be used by subsequent invocations of .BR less . .SH FILE FORMAT The input file consists of one or more .IR sections . Each section starts with a line that identifies the type of section. Possible sections are: .IP #command Customizes command key bindings. .IP #line-edit Customizes line-editing key bindings. .IP #env Defines environment variables. .PP -Blank lines and lines which start with a pound sign (#) are ignored, +Blank lines and lines which start with a hash mark (#) are ignored, except as noted below. . .SH "COMMAND SECTION" The command section begins with the line .sp #command .sp If the command section is the first section in the file, this line may be omitted. The command section consists of lines of the form: .sp \fIstring\fP \fIaction\fP [extra-string] .sp Whitespace is any sequence of one or more spaces and/or tabs. The \fIstring\fP is the command key(s) which invoke the action. The \fIstring\fP may be a single command key, or a sequence of up to 15 keys. The \fIaction\fP is the name of the less action, from the list below. The characters in the \fIstring\fP may appear literally, or be prefixed by a caret to indicate a control key. A backslash followed by one to three octal digits may be used to specify a character by its octal value. A backslash followed by certain characters specifies input characters as follows: .RS 5m .TS l l l. \eb BACKSPACE (0x08) \ee ESCAPE (0x1B) \en NEWLINE (0x0A) \er RETURN (0x0D) \et TAB (0x09) .TE .sp \ek followed by a single character represents the char(s) produced when one of these keys is pressed: .TS l l. \ekb BACKSPACE (the BACKSPACE key) \ekB ctrl-BACKSPACE \ekd DOWN ARROW \ekD PAGE DOWN \eke END \ekh HOME \eki INSERT \ekl LEFT ARROW \ekL ctrl-LEFT ARROW \ekr RIGHT ARROW \ekR ctrl-RIGHT ARROW \ekt BACKTAB \eku UP ARROW \ekU PAGE UP \ekx DELETE \ekX ctrl-DELETE \ek1 F1 .TE .PP A backslash followed by any other character indicates that character is to be taken literally. Characters which must be preceded by backslash include -caret, space, tab and the backslash itself. +caret, space, tab, hash mark and the backslash itself. .PP An action may be followed by an "extra" string. When such a command is entered while running .BR less , the action is performed, and then the extra string is parsed, just as if it were typed in to .BR less . This feature can be used in certain cases to extend the functionality of a command. For example, see the "{" and ":t" commands in the example below. The extra string has a special meaning for the "quit" action: when .B less quits, the first character of the extra string is used as its exit status. . .SH EXAMPLE The following input file describes the set of default command keys used by .BR less . Documentation on each command can be found in the .less man page, under the key sequence which invokes the command. .sp .RS 5m .TS l l. #command \er forw-line \en forw-line e forw-line j forw-line \ekd forw-line ^E forw-line ^N forw-line k back-line y back-line ^Y back-line ^K back-line ^P back-line J forw-line-force K back-line-force Y back-line-force d forw-scroll ^D forw-scroll u back-scroll ^U back-scroll \e40 forw-screen f forw-screen ^F forw-screen ^V forw-screen \ekD forw-screen b back-screen ^B back-screen \eev back-screen \ekU back-screen z forw-window w back-window \ee\e40 forw-screen-force F forw-forever \eeF forw-until-hilite R repaint-flush r repaint ^R repaint ^L repaint \eeu undo-hilite \eeU clear-search g goto-line \ekh goto-line < goto-line \ee< goto-line p percent % percent \ee[ left-scroll \ee] right-scroll \ee( left-scroll \ee) right-scroll \ekl left-scroll \ekr right-scroll \ee{ no-scroll \ee} end-scroll { forw-bracket {} } back-bracket {} ( forw-bracket () ) back-bracket () [ forw-bracket [] ] back-bracket [] \ee^F forw-bracket \ee^B back-bracket G goto-end \ee> goto-end > goto-end \eke goto-end \eeG goto-end-buffered \&= status ^G status :f status / forw-search ? back-search \ee/ forw-search * \ee? back-search * n repeat-search \een repeat-search-all N reverse-search \eeN reverse-search-all & filter m set-mark M set-mark-bottom \eem clear-mark ' goto-mark ^X^X goto-mark E examine :e examine ^X^V examine :n next-file :p prev-file t next-tag T prev-tag :x index-file :d remove-file - toggle-option :t toggle-option t s toggle-option o ## Use a long option name by starting the ## extra string with ONE dash; eg: ## s toggle-option -log-file\en \&_ display-option | pipe v visual ! shell # pshell + firstcmd H help h help V version 0 digit 1 digit 2 digit 3 digit 4 digit 5 digit 6 digit 7 digit 8 digit 9 digit q quit Q quit :q quit :Q quit ZZ quit .TE .RE .sp .SH PRECEDENCE Commands specified by .B lesskey take precedence over the default commands. A default command key may be disabled by including it in the input file with the action "invalid". Alternatively, a key may be defined to do nothing by using the action "noaction". "noaction" is similar to "invalid", but .B less will give an error beep for an "invalid" command, but not for a "noaction" command. In addition, ALL default commands may be disabled by adding this control line to the input file: .sp #stop .sp This will cause all default commands to be ignored. The #stop line should be the last line in that section of the file. .PP Be aware that #stop can be dangerous. Since all default commands are disabled, you must provide sufficient commands before the #stop line to enable all necessary actions. For example, failure to provide a "quit" command can lead to frustration. . .SH "LINE EDITING SECTION" The line-editing section begins with the line: .sp #line-edit .sp This section specifies new key bindings for the line editing commands, in a manner similar to the way key bindings for ordinary commands are specified in the #command section. The line-editing section consists of a list of keys and actions, one per line as in the example below. . .SH EXAMPLE The following input file describes the set of default line-editing keys used by .BR less : .sp .RS 5m .TS l l. #line-edit \et forw-complete \e17 back-complete \ee\et back-complete ^L expand ^V literal ^A literal \eel right \ekr right \eeh left \ekl left \eeb word-left \ee\ekl word-left \eew word-right \ee\ekr word-right \eei insert \eex delete \ekx delete \eeX word-delete \eekx word-delete \ee\eb word-backspace \ee0 home \ekh home \ee$ end \eke end \eek up \eku up \eej down ^G abort .TE .RE .sp . .SH "LESS ENVIRONMENT VARIABLES" The environment variable section begins with the line .sp #env .sp Following this line is a list of environment variable assignments. Each line consists of an environment variable name, an equals sign (=) and the value to be assigned to the environment variable. White space before and after the equals sign is ignored. Variables assigned in this way are visible only to .BR less . If a variable is specified in the system environment and also in a lesskey file, the value in the lesskey file takes precedence. . .sp If the variable name is followed by += rather than =, the string is appended to the variable's existing value. This currently works only if any += lines immediately follow the same variable's original definition (with an = line), without any intervening definitions of other variables. It can append only to a variable defined earlier in the file; it cannot append to a variable in the system environment. +The string is appended literally, without any extra whitespace added, +so if whitespace is desired, +it should be appended to the end of the preceding line. +(It cannot be added to the beginning of the += string because space after +the equals sign is ignored, as noted above.) . .SH CONDITIONAL CONFIGURATION If a line begins with #version followed by a relational operator and a version number, the remainder of the line is parsed if and only if the running version of .B less (or .BR lesskey ) matches the operator. This can be helpful if a lesskey file is used by different versions of .BR less . .sp For example, suppose that a new command named 'sideways-search' is added in .B less version 777. Then the following line would assign the command to the Q key, but only in versions of .B less which support it. The line would be ignored by versions earlier than 777. .sp .nf #version >= 777 Q sideways-search .fi .sp These six operators are supported: .RS 5m .TS l l. > Greater than < Less than >= Greater than or equal to <= Less than or equal to = Equal to != Not equal to .TE .RE .sp The #version feature is not supported in .B less and .B lesskey before version 594. In those older versions, all #version lines are ignored. . .SH EXAMPLE The following input file sets the \-i and \-S options when .less is run and, on version 595 and higher, adds a \-\-color option. .sp .nf #env - LESS = \-i\ \-S + ## (Note that there must be a space at the end of the next line, + ## to separate the --color option from the -S option.) + LESS = \-i\ \-S\ #version\ >=\ 595\ \ LESS\ +=\ \-\-color=Hkc .fi . .SH "SEE ALSO" .BR less (1) . .SH WARNINGS On MS-DOS and OS/2 systems, certain keys send a sequence of characters which start with a NUL character (0). This NUL character should be represented as \e340 in a lesskey file. . .SH COPYRIGHT Copyright (C) 1984-2023 Mark Nudelman .PP less is part of the GNU project and is free software. You can redistribute it and/or modify it under the terms of either (1) the GNU General Public License as published by the Free Software Foundation; or (2) the Less License. See the file README in the less distribution for more details regarding redistribution. You should have received a copy of the GNU General Public License along with the source for less; see the file COPYING. If not, write to the Free Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. You should also have received a copy of the Less License; see the file LICENSE. .PP less is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. . .SH AUTHOR . Mark Nudelman .br Report bugs at https://github.com/gwsw/less/issues. diff --git a/contrib/less/optfunc.c b/contrib/less/optfunc.c index da7e54c3d60a..974a6f6c8c8b 100644 --- a/contrib/less/optfunc.c +++ b/contrib/less/optfunc.c @@ -1,1096 +1,1096 @@ /* * Copyright (C) 1984-2023 Mark Nudelman * * You may distribute under the terms of either the GNU General Public * License or the Less License, as specified in the README file. * * For more information, see the README file. */ /* * Handling functions for command line options. * * Most options are handled by the generic code in option.c. * But all string options, and a few non-string options, require * special handling specific to the particular option. * This special processing is done by the "handling functions" in this file. * * Each handling function is passed a "type" and, if it is a string * option, the string which should be "assigned" to the option. * The type may be one of: * INIT The option is being initialized from the command line. * TOGGLE The option is being changed from within the program. * QUERY The setting of the option is merely being queried. */ #include "less.h" #include "option.h" extern int nbufs; extern int bufspace; extern int pr_type; extern int plusoption; extern int swindow; extern int sc_width; extern int sc_height; extern int secure; extern int dohelp; extern int is_tty; extern char openquote; extern char closequote; extern char *prproto[]; extern char *eqproto; extern char *hproto; extern char *wproto; extern char *every_first_cmd; extern IFILE curr_ifile; extern char version[]; extern int jump_sline; extern long jump_sline_fraction; extern int shift_count; extern long shift_count_fraction; extern char rscroll_char; extern int rscroll_attr; extern int mousecap; extern int wheel_lines; extern int less_is_more; extern int linenum_width; extern int status_col_width; extern int use_color; extern int want_filesize; extern int header_lines; extern int header_cols; extern int def_search_type; extern int chopline; extern int tabstops[]; extern int ntabstops; extern int tabdefault; extern char intr_char; #if LOGFILE extern char *namelogfile; extern int force_logfile; extern int logfile; #endif #if TAGS public char *tagoption = NULL; extern char *tags; extern char ztags[]; #endif #if LESSTEST extern char *ttyin_name; #endif /*LESSTEST*/ #if MSDOS_COMPILER extern int nm_fg_color, nm_bg_color; extern int bo_fg_color, bo_bg_color; extern int ul_fg_color, ul_bg_color; extern int so_fg_color, so_bg_color; extern int bl_fg_color, bl_bg_color; extern int sgr_mode; #if MSDOS_COMPILER==WIN32C #ifndef COMMON_LVB_UNDERSCORE #define COMMON_LVB_UNDERSCORE 0x8000 #endif #endif #endif #if LOGFILE /* * Handler for -o option. */ public void opt_o(int type, char *s) { PARG parg; char *filename; if (secure) { error("log file support is not available", NULL_PARG); return; } switch (type) { case INIT: namelogfile = save(s); break; case TOGGLE: if (ch_getflags() & CH_CANSEEK) { error("Input is not a pipe", NULL_PARG); return; } if (logfile >= 0) { error("Log file is already in use", NULL_PARG); return; } s = skipsp(s); if (namelogfile != NULL) free(namelogfile); filename = lglob(s); namelogfile = shell_unquote(filename); free(filename); use_logfile(namelogfile); sync_logfile(); break; case QUERY: if (logfile < 0) error("No log file", NULL_PARG); else { parg.p_string = namelogfile; error("Log file \"%s\"", &parg); } break; } } /* * Handler for -O option. */ public void opt__O(int type, char *s) { force_logfile = TRUE; opt_o(type, s); } #endif /* * Handlers for -j option. */ public void opt_j(int type, char *s) { PARG parg; int len; int err; switch (type) { case INIT: case TOGGLE: if (*s == '.') { s++; jump_sline_fraction = getfraction(&s, "j", &err); if (err) error("Invalid line fraction", NULL_PARG); else calc_jump_sline(); } else { int sline = getnum(&s, "j", &err); if (err) error("Invalid line number", NULL_PARG); else { jump_sline = sline; jump_sline_fraction = -1; } } break; case QUERY: if (jump_sline_fraction < 0) { parg.p_int = jump_sline; error("Position target at screen line %d", &parg); } else { - char buf[24]; + char buf[INT_STRLEN_BOUND(long)+2]; SNPRINTF1(buf, sizeof(buf), ".%06ld", jump_sline_fraction); len = (int) strlen(buf); while (len > 2 && buf[len-1] == '0') len--; buf[len] = '\0'; parg.p_string = buf; error("Position target at screen position %s", &parg); } break; } } public void calc_jump_sline(void) { if (jump_sline_fraction < 0) return; - jump_sline = muldiv(sc_height, jump_sline_fraction, NUM_FRAC_DENOM); + jump_sline = (int) muldiv(sc_height, jump_sline_fraction, NUM_FRAC_DENOM); } /* * Handlers for -# option. */ public void opt_shift(int type, char *s) { PARG parg; int len; int err; switch (type) { case INIT: case TOGGLE: if (*s == '.') { s++; shift_count_fraction = getfraction(&s, "#", &err); if (err) error("Invalid column fraction", NULL_PARG); else calc_shift_count(); } else { int hs = getnum(&s, "#", &err); if (err) error("Invalid column number", NULL_PARG); else { shift_count = hs; shift_count_fraction = -1; } } break; case QUERY: if (shift_count_fraction < 0) { parg.p_int = shift_count; error("Horizontal shift %d columns", &parg); } else { - char buf[24]; + char buf[INT_STRLEN_BOUND(long)+2]; SNPRINTF1(buf, sizeof(buf), ".%06ld", shift_count_fraction); len = (int) strlen(buf); while (len > 2 && buf[len-1] == '0') len--; buf[len] = '\0'; parg.p_string = buf; error("Horizontal shift %s of screen width", &parg); } break; } } public void calc_shift_count(void) { if (shift_count_fraction < 0) return; - shift_count = muldiv(sc_width, shift_count_fraction, NUM_FRAC_DENOM); + shift_count = (int) muldiv(sc_width, shift_count_fraction, NUM_FRAC_DENOM); } #if USERFILE public void opt_k(int type, char *s) { PARG parg; switch (type) { case INIT: if (lesskey(s, 0)) { parg.p_string = s; error("Cannot use lesskey file \"%s\"", &parg); } break; } } #if HAVE_LESSKEYSRC public void opt_ks(int type, char *s) { PARG parg; switch (type) { case INIT: if (lesskey_src(s, 0)) { parg.p_string = s; error("Cannot use lesskey source file \"%s\"", &parg); } break; } } #endif /* HAVE_LESSKEYSRC */ #endif /* USERFILE */ #if TAGS /* * Handler for -t option. */ public void opt_t(int type, char *s) { IFILE save_ifile; POSITION pos; switch (type) { case INIT: tagoption = save(s); /* Do the rest in main() */ break; case TOGGLE: if (secure) { error("tags support is not available", NULL_PARG); break; } findtag(skipsp(s)); save_ifile = save_curr_ifile(); /* * Try to open the file containing the tag * and search for the tag in that file. */ if (edit_tagfile() || (pos = tagsearch()) == NULL_POSITION) { /* Failed: reopen the old file. */ reedit_ifile(save_ifile); break; } unsave_ifile(save_ifile); jump_loc(pos, jump_sline); break; } } /* * Handler for -T option. */ public void opt__T(int type, char *s) { PARG parg; char *filename; switch (type) { case INIT: tags = save(s); break; case TOGGLE: s = skipsp(s); if (tags != NULL && tags != ztags) free(tags); filename = lglob(s); tags = shell_unquote(filename); free(filename); break; case QUERY: parg.p_string = tags; error("Tags file \"%s\"", &parg); break; } } #endif /* * Handler for -p option. */ public void opt_p(int type, char *s) { switch (type) { case INIT: /* * Unget a command for the specified string. */ if (less_is_more) { /* * In "more" mode, the -p argument is a command, * not a search string, so we don't need a slash. */ every_first_cmd = save(s); } else { plusoption = TRUE; /* * {{ This won't work if the "/" command is * changed or invalidated by a .lesskey file. }} */ ungetsc("/"); ungetsc(s); ungetcc_back(CHAR_END_COMMAND); } break; } } /* * Handler for -P option. */ public void opt__P(int type, char *s) { char **proto; PARG parg; switch (type) { case INIT: case TOGGLE: /* * Figure out which prototype string should be changed. */ switch (*s) { case 's': proto = &prproto[PR_SHORT]; s++; break; case 'm': proto = &prproto[PR_MEDIUM]; s++; break; case 'M': proto = &prproto[PR_LONG]; s++; break; case '=': proto = &eqproto; s++; break; case 'h': proto = &hproto; s++; break; case 'w': proto = &wproto; s++; break; default: proto = &prproto[PR_SHORT]; break; } free(*proto); *proto = save(s); break; case QUERY: parg.p_string = prproto[pr_type]; error("%s", &parg); break; } } /* * Handler for the -b option. */ /*ARGSUSED*/ public void opt_b(int type, char *s) { switch (type) { case INIT: case TOGGLE: /* * Set the new number of buffers. */ ch_setbufspace(bufspace); break; case QUERY: break; } } /* * Handler for the -i option. */ /*ARGSUSED*/ public void opt_i(int type, char *s) { switch (type) { case TOGGLE: chg_caseless(); break; case QUERY: case INIT: break; } } /* * Handler for the -V option. */ /*ARGSUSED*/ public void opt__V(int type, char *s) { switch (type) { case TOGGLE: case QUERY: dispversion(); break; case INIT: set_output(1); /* Force output to stdout per GNU standard for --version output. */ putstr("less "); putstr(version); putstr(" ("); putstr(pattern_lib_name()); putstr(" regular expressions)\n"); { char constant *copyright = "Copyright (C) 1984-2023 Mark Nudelman\n\n"; putstr(copyright); } if (version[strlen(version)-1] == 'x') { putstr("** This is an EXPERIMENTAL build of the 'less' software,\n"); putstr("** and may not function correctly.\n"); putstr("** Obtain release builds from the web page below.\n\n"); } #if LESSTEST putstr("This build supports LESSTEST.\n"); #endif /*LESSTEST*/ putstr("less comes with NO WARRANTY, to the extent permitted by law.\n"); putstr("For information about the terms of redistribution,\n"); putstr("see the file named README in the less distribution.\n"); putstr("Home page: https://greenwoodsoftware.com/less\n"); quit(QUIT_OK); break; } } #if MSDOS_COMPILER /* * Parse an MSDOS color descriptor. */ static void colordesc(char *s, int *fg_color, int *bg_color) { int fg, bg; #if MSDOS_COMPILER==WIN32C int ul = 0; if (*s == 'u') { ul = COMMON_LVB_UNDERSCORE; s++; if (*s == '\0') { *fg_color = nm_fg_color | ul; *bg_color = nm_bg_color; return; } } #endif if (parse_color(s, &fg, &bg) == CT_NULL) { PARG p; p.p_string = s; error("Invalid color string \"%s\"", &p); } else { if (fg == CV_NOCHANGE) fg = nm_fg_color; if (bg == CV_NOCHANGE) bg = nm_bg_color; #if MSDOS_COMPILER==WIN32C fg |= ul; #endif *fg_color = fg; *bg_color = bg; } } #endif static int color_from_namechar(char namechar) { switch (namechar) { case 'B': return AT_COLOR_BIN; case 'C': return AT_COLOR_CTRL; case 'E': return AT_COLOR_ERROR; case 'H': return AT_COLOR_HEADER; case 'M': return AT_COLOR_MARK; case 'N': return AT_COLOR_LINENUM; case 'P': return AT_COLOR_PROMPT; case 'R': return AT_COLOR_RSCROLL; case 'S': return AT_COLOR_SEARCH; case 'W': case 'A': return AT_COLOR_ATTN; case 'n': return AT_NORMAL; case 's': return AT_STANDOUT; case 'd': return AT_BOLD; case 'u': return AT_UNDERLINE; case 'k': return AT_BLINK; default: if (namechar >= '1' && namechar <= '0'+NUM_SEARCH_COLORS) return AT_COLOR_SUBSEARCH(namechar-'0'); return -1; } } /* * Handler for the -D option. */ /*ARGSUSED*/ public void opt_D(int type, char *s) { PARG p; int attr; switch (type) { case INIT: case TOGGLE: #if MSDOS_COMPILER if (*s == 'a') { sgr_mode = !sgr_mode; break; } #endif attr = color_from_namechar(s[0]); if (attr < 0) { p.p_char = s[0]; error("Invalid color specifier '%c'", &p); return; } if (!use_color && (attr & AT_COLOR)) { error("Set --use-color before changing colors", NULL_PARG); return; } s++; #if MSDOS_COMPILER if (!(attr & AT_COLOR)) { switch (attr) { case AT_NORMAL: colordesc(s, &nm_fg_color, &nm_bg_color); break; case AT_BOLD: colordesc(s, &bo_fg_color, &bo_bg_color); break; case AT_UNDERLINE: colordesc(s, &ul_fg_color, &ul_bg_color); break; case AT_BLINK: colordesc(s, &bl_fg_color, &bl_bg_color); break; case AT_STANDOUT: colordesc(s, &so_fg_color, &so_bg_color); break; } if (type == TOGGLE) { at_enter(AT_STANDOUT); at_exit(); } } else #endif if (set_color_map(attr, s) < 0) { p.p_string = s; error("Invalid color string \"%s\"", &p); return; } break; #if MSDOS_COMPILER case QUERY: p.p_string = (sgr_mode) ? "on" : "off"; error("SGR mode is %s", &p); break; #endif } } /* */ public void set_tabs(char *s, int len) { int i; char *es = s + len; /* Start at 1 because tabstops[0] is always zero. */ for (i = 1; i < TABSTOP_MAX; ) { int n = 0; int v = FALSE; while (s < es && *s == ' ') s++; for (; s < es && *s >= '0' && *s <= '9'; s++) { v |= ckd_mul(&n, n, 10); v |= ckd_add(&n, n, *s - '0'); } if (!v && n > tabstops[i-1]) tabstops[i++] = n; while (s < es && *s == ' ') s++; if (s == es || *s++ != ',') break; } if (i < 2) return; ntabstops = i; tabdefault = tabstops[ntabstops-1] - tabstops[ntabstops-2]; } /* * Handler for the -x option. */ public void opt_x(int type, char *s) { char msg[60+((INT_STRLEN_BOUND(int)+1)*TABSTOP_MAX)]; int i; PARG p; switch (type) { case INIT: case TOGGLE: set_tabs(s, strlen(s)); break; case QUERY: strcpy(msg, "Tab stops "); if (ntabstops > 2) { for (i = 1; i < ntabstops; i++) { if (i > 1) strcat(msg, ","); sprintf(msg+strlen(msg), "%d", tabstops[i]); } sprintf(msg+strlen(msg), " and then "); } sprintf(msg+strlen(msg), "every %d spaces", tabdefault); p.p_string = msg; error("%s", &p); break; } } /* * Handler for the -" option. */ public void opt_quote(int type, char *s) { char buf[3]; PARG parg; switch (type) { case INIT: case TOGGLE: if (s[0] == '\0') { openquote = closequote = '\0'; break; } if (s[1] != '\0' && s[2] != '\0') { error("-\" must be followed by 1 or 2 chars", NULL_PARG); return; } openquote = s[0]; if (s[1] == '\0') closequote = openquote; else closequote = s[1]; break; case QUERY: buf[0] = openquote; buf[1] = closequote; buf[2] = '\0'; parg.p_string = buf; error("quotes %s", &parg); break; } } /* * Handler for the --rscroll option. */ /*ARGSUSED*/ public void opt_rscroll(int type, char *s) { PARG p; switch (type) { case INIT: case TOGGLE: { char *fmt; int attr = AT_STANDOUT; setfmt(s, &fmt, &attr, "*s>", FALSE); if (strcmp(fmt, "-") == 0) { rscroll_char = 0; } else { rscroll_char = *fmt ? *fmt : '>'; rscroll_attr = attr|AT_COLOR_RSCROLL; } break; } case QUERY: { p.p_string = rscroll_char ? prchar(rscroll_char) : "-"; error("rscroll character is %s", &p); break; } } } /* * "-?" means display a help message. * If from the command line, exit immediately. */ /*ARGSUSED*/ public void opt_query(int type, char *s) { switch (type) { case QUERY: case TOGGLE: error("Use \"h\" for help", NULL_PARG); break; case INIT: dohelp = 1; } } /* * Handler for the --mouse option. */ /*ARGSUSED*/ public void opt_mousecap(int type, char *s) { switch (type) { case TOGGLE: if (mousecap == OPT_OFF) deinit_mouse(); else init_mouse(); break; case INIT: case QUERY: break; } } /* * Handler for the --wheel-lines option. */ /*ARGSUSED*/ public void opt_wheel_lines(int type, char *s) { switch (type) { case INIT: case TOGGLE: if (wheel_lines <= 0) wheel_lines = default_wheel_lines(); break; case QUERY: break; } } /* * Handler for the --line-number-width option. */ /*ARGSUSED*/ public void opt_linenum_width(int type, char *s) { PARG parg; switch (type) { case INIT: case TOGGLE: if (linenum_width > MAX_LINENUM_WIDTH) { parg.p_int = MAX_LINENUM_WIDTH; error("Line number width must not be larger than %d", &parg); linenum_width = MIN_LINENUM_WIDTH; } break; case QUERY: break; } } /* * Handler for the --status-column-width option. */ /*ARGSUSED*/ public void opt_status_col_width(int type, char *s) { PARG parg; switch (type) { case INIT: case TOGGLE: if (status_col_width > MAX_STATUSCOL_WIDTH) { parg.p_int = MAX_STATUSCOL_WIDTH; error("Status column width must not be larger than %d", &parg); status_col_width = 2; } break; case QUERY: break; } } /* * Handler for the --file-size option. */ /*ARGSUSED*/ public void opt_filesize(int type, char *s) { switch (type) { case INIT: case TOGGLE: if (want_filesize && curr_ifile != NULL && ch_length() == NULL_POSITION) scan_eof(); break; case QUERY: break; } } /* * Handler for the --intr option. */ /*ARGSUSED*/ public void opt_intr(int type, char *s) { PARG p; switch (type) { case INIT: case TOGGLE: intr_char = *s; if (intr_char == '^' && s[1] != '\0') intr_char = CONTROL(s[1]); break; case QUERY: { p.p_string = prchar(intr_char); error("interrupt character is %s", &p); break; } } } /* * Handler for the --header option. */ /*ARGSUSED*/ public void opt_header(int type, char *s) { int err; int n; switch (type) { case INIT: case TOGGLE: header_lines = 0; header_cols = 0; if (*s != ',') { n = getnum(&s, "header", &err); if (err) { error("invalid number of lines", NULL_PARG); return; } header_lines = n; } if (*s == ',') { ++s; n = getnum(&s, "header", &err); if (err) error("invalid number of columns", NULL_PARG); else header_cols = n; } break; case QUERY: { char buf[2*INT_STRLEN_BOUND(int)+2]; PARG parg; SNPRINTF2(buf, sizeof(buf), "%d,%d", header_lines, header_cols); parg.p_string = buf; error("header (lines,columns) is %s", &parg); } break; } } /* * Handler for the --search-options option. */ /*ARGSUSED*/ public void opt_search_type(int type, char *s) { int st; PARG parg; char buf[16]; char *bp; int i; switch (type) { case INIT: case TOGGLE: st = 0; for (; *s != '\0'; s++) { switch (*s) { case 'E': case 'e': case CONTROL('E'): st |= SRCH_PAST_EOF; break; case 'F': case 'f': case CONTROL('F'): st |= SRCH_FIRST_FILE; break; case 'K': case 'k': case CONTROL('K'): st |= SRCH_NO_MOVE; break; case 'N': case 'n': case CONTROL('N'): st |= SRCH_NO_MATCH; break; case 'R': case 'r': case CONTROL('R'): st |= SRCH_NO_REGEX; break; case 'W': case 'w': case CONTROL('W'): st |= SRCH_WRAP; break; case '-': st = 0; break; case '^': break; default: if (*s >= '1' && *s <= '0'+NUM_SEARCH_COLORS) { st |= SRCH_SUBSEARCH(*s-'0'); break; } parg.p_char = *s; error("invalid search option '%c'", &parg); return; } } def_search_type = norm_search_type(st); break; case QUERY: bp = buf; if (def_search_type & SRCH_PAST_EOF) *bp++ = 'E'; if (def_search_type & SRCH_FIRST_FILE) *bp++ = 'F'; if (def_search_type & SRCH_NO_MOVE) *bp++ = 'K'; if (def_search_type & SRCH_NO_MATCH) *bp++ = 'N'; if (def_search_type & SRCH_NO_REGEX) *bp++ = 'R'; if (def_search_type & SRCH_WRAP) *bp++ = 'W'; for (i = 1; i <= NUM_SEARCH_COLORS; i++) if (def_search_type & SRCH_SUBSEARCH(i)) *bp++ = '0'+i; if (bp == buf) *bp++ = '-'; *bp = '\0'; parg.p_string = buf; error("search options: %s", &parg); break; } } #if LESSTEST /* * Handler for the --tty option. */ /*ARGSUSED*/ public void opt_ttyin_name(int type, char *s) { switch (type) { case INIT: ttyin_name = s; is_tty = 1; break; } } #endif /*LESSTEST*/ public int chop_line(void) { return (chopline || header_cols > 0 || header_lines > 0); } /* * Get the "screen window" size. */ public int get_swindow(void) { if (swindow > 0) return (swindow); return (sc_height - header_lines + swindow); } diff --git a/contrib/less/os.c b/contrib/less/os.c index 56e3bf32ec9e..046270e68fc4 100644 --- a/contrib/less/os.c +++ b/contrib/less/os.c @@ -1,481 +1,507 @@ /* * Copyright (C) 1984-2023 Mark Nudelman * * You may distribute under the terms of either the GNU General Public * License or the Less License, as specified in the README file. * * For more information, see the README file. */ /* * Operating system dependent routines. * * Most of the stuff in here is based on Unix, but an attempt * has been made to make things work on other operating systems. * This will sometimes result in a loss of functionality, unless * someone rewrites code specifically for the new operating system. * * The makefile provides defines to decide whether various * Unix features are present. */ #include "less.h" #include #include #if MSDOS_COMPILER==WIN32C #include #endif #if HAVE_TIME_H #include #endif #if HAVE_ERRNO_H #include #endif #if HAVE_VALUES_H #include #endif #if defined(__APPLE__) #include #endif #if HAVE_POLL && !MSDOS_COMPILER #define USE_POLL 1 static int use_poll = TRUE; #else #define USE_POLL 0 #endif #if USE_POLL #include +static int any_data = FALSE; #endif /* * BSD setjmp() saves (and longjmp() restores) the signal mask. * This costs a system call or two per setjmp(), so if possible we clear the * signal mask with sigsetmask(), and use _setjmp()/_longjmp() instead. * On other systems, setjmp() doesn't affect the signal mask and so * _setjmp() does not exist; we just use setjmp(). */ #if HAVE__SETJMP && HAVE_SIGSETMASK #define SET_JUMP _setjmp #define LONG_JUMP _longjmp #else #define SET_JUMP setjmp #define LONG_JUMP longjmp #endif public int reading; public int waiting_for_data; public int consecutive_nulls = 0; /* Milliseconds to wait for data before displaying "waiting for data" message. */ static int waiting_for_data_delay = 4000; static jmp_buf read_label; extern int sigs; extern int ignore_eoi; extern int exit_F_on_close; extern int follow_mode; extern int scanning_eof; extern char intr_char; #if !MSDOS_COMPILER extern int tty; #endif #if LESSTEST extern char *ttyin_name; #endif /*LESSTEST*/ public void init_poll(void) { - char *delay = lgetenv("LESS_DATA_DELAY"); - int idelay = (delay == NULL) ? 0 : atoi(delay); - if (idelay > 0) - waiting_for_data_delay = idelay; + char *delay = lgetenv("LESS_DATA_DELAY"); + int idelay = (delay == NULL) ? 0 : atoi(delay); + if (idelay > 0) + waiting_for_data_delay = idelay; #if USE_POLL #if defined(__APPLE__) /* In old versions of MacOS, poll() does not work with /dev/tty. */ struct utsname uts; if (uname(&uts) < 0 || lstrtoi(uts.release, NULL, 10) < 20) use_poll = FALSE; #endif #endif } #if USE_POLL /* * Check whether data is available, either from a file/pipe or from the tty. * Return READ_AGAIN if no data currently available, but caller should retry later. * Return READ_INTR to abort F command (forw_loop). * Return 0 if safe to read from fd. */ static int check_poll(int fd, int tty) { struct pollfd poller[2] = { { fd, POLLIN, 0 }, { tty, POLLIN, 0 } }; int timeout = (waiting_for_data && !(scanning_eof && follow_mode == FOLLOW_NAME)) ? -1 : waiting_for_data_delay; + if (!any_data) + { + /* + * Don't do polling if no data has yet been received, + * to allow a program piping data into less to have temporary + * access to the tty (like sudo asking for a password). + */ + return (0); + } poll(poller, 2, timeout); #if LESSTEST if (ttyin_name == NULL) /* Check for ^X only on a real tty. */ #endif /*LESSTEST*/ { if (poller[1].revents & POLLIN) { LWCHAR ch = getchr(); if (ch == intr_char) /* Break out of "waiting for data". */ return (READ_INTR); ungetcc_back(ch); } } if (ignore_eoi && exit_F_on_close && (poller[0].revents & (POLLHUP|POLLIN)) == POLLHUP) /* Break out of F loop on HUP due to --exit-follow-on-close. */ return (READ_INTR); if ((poller[0].revents & (POLLIN|POLLHUP|POLLERR)) == 0) /* No data available; let caller take action, then try again. */ return (READ_AGAIN); /* There is data (or HUP/ERR) available. Safe to call read() without blocking. */ return (0); } #endif /* USE_POLL */ public int supports_ctrl_x(void) { #if USE_POLL return (use_poll); #else return (FALSE); #endif /* USE_POLL */ } /* * Like read() system call, but is deliberately interruptible. * A call to intread() from a signal handler will interrupt * any pending iread(). */ public int iread(int fd, unsigned char *buf, unsigned int len) { int n; start: #if MSDOS_COMPILER==WIN32C if (ABORT_SIGS()) return (READ_INTR); #else #if MSDOS_COMPILER && MSDOS_COMPILER != DJGPPC if (kbhit()) { int c; c = getch(); if (c == '\003') return (READ_INTR); ungetch(c); } #endif #endif if (!reading && SET_JUMP(read_label)) { /* * We jumped here from intread. */ reading = 0; #if HAVE_SIGPROCMASK { sigset_t mask; sigemptyset(&mask); sigprocmask(SIG_SETMASK, &mask, NULL); } #else #if HAVE_SIGSETMASK sigsetmask(0); #else #ifdef _OSK sigmask(~0); #endif #endif +#endif +#if !MSDOS_COMPILER + if (fd != tty && !ABORT_SIGS()) + /* Non-interrupt signal like SIGWINCH. */ + return (READ_AGAIN); #endif return (READ_INTR); } flush(); reading = 1; #if MSDOS_COMPILER==DJGPPC if (isatty(fd)) { /* * Don't try reading from a TTY until a character is * available, because that makes some background programs * believe DOS is busy in a way that prevents those * programs from working while "less" waits. - * {{ This code was added 12 Jan 2007; still needed? }} + * {{ This code was added 12 Jan 2007; still needed? }} */ fd_set readfds; FD_ZERO(&readfds); FD_SET(fd, &readfds); if (select(fd+1, &readfds, 0, 0, 0) == -1) { reading = 0; return (READ_ERR); } } #endif #if USE_POLL if (fd != tty && use_poll) { int ret = check_poll(fd, tty); if (ret != 0) { if (ret == READ_INTR) sigs |= S_INTERRUPT; reading = 0; return (ret); } } #else #if MSDOS_COMPILER==WIN32C - if (win32_kbhit() && WIN32getch() == intr_char) + if (win32_kbhit()) { - sigs |= S_INTERRUPT; - reading = 0; - return (READ_INTR); + int c; + + c = WIN32getch(); + if (c == intr_char) + { + sigs |= S_INTERRUPT; + reading = 0; + return (READ_INTR); + } + WIN32ungetch(c); } #endif #endif n = read(fd, buf, len); reading = 0; #if 1 /* * This is a kludge to workaround a problem on some systems * where terminating a remote tty connection causes read() to * start returning 0 forever, instead of -1. */ { if (!ignore_eoi) { if (n == 0) consecutive_nulls++; else consecutive_nulls = 0; if (consecutive_nulls > 20) quit(QUIT_ERROR); } } #endif if (n < 0) { #if HAVE_ERRNO /* * Certain values of errno indicate we should just retry the read. */ #if MUST_DEFINE_ERRNO extern int errno; #endif #ifdef EINTR if (errno == EINTR) goto start; #endif #ifdef EAGAIN if (errno == EAGAIN) goto start; #endif #endif return (READ_ERR); } +#if USE_POLL + if (fd != tty && n > 0) + any_data = TRUE; +#endif return (n); } /* * Interrupt a pending iread(). */ public void intread(void) { LONG_JUMP(read_label, 1); } /* * Return the current time. */ #if HAVE_TIME public time_type get_time(void) { time_type t; time(&t); return (t); } #endif #if !HAVE_STRERROR /* * Local version of strerror, if not available from the system. */ static char * strerror(int err) { static char buf[INT_STRLEN_BOUND(int)+12]; #if HAVE_SYS_ERRLIST extern char *sys_errlist[]; extern int sys_nerr; if (err < sys_nerr) return sys_errlist[err]; #endif sprintf(buf, "Error %d", err); return buf; } #endif /* * errno_message: Return an error message based on the value of "errno". */ public char * errno_message(char *filename) { char *p; char *m; int len; #if HAVE_ERRNO #if MUST_DEFINE_ERRNO extern int errno; #endif p = strerror(errno); #else p = "cannot open"; #endif len = (int) (strlen(filename) + strlen(p) + 3); m = (char *) ecalloc(len, sizeof(char)); SNPRINTF2(m, len, "%s: %s", filename, p); return (m); } /* * Return a description of a signal. * The return value is good until the next call to this function. */ public char * signal_message(int sig) { static char sigbuf[sizeof("Signal ") + INT_STRLEN_BOUND(sig) + 1]; #if HAVE_STRSIGNAL char *description = strsignal(sig); if (description) return description; #endif sprintf(sigbuf, "Signal %d", sig); return sigbuf; } /* * Return (VAL * NUM) / DEN, where DEN is positive * and min(VAL, NUM) <= DEN so the result cannot overflow. * Round to the nearest integer, breaking ties by rounding to even. */ public uintmax muldiv(uintmax val, uintmax num, uintmax den) { /* * Like round(val * (double) num / den), but without rounding error. * Overflow cannot occur, so there is no need for floating point. */ uintmax q = val / den; uintmax r = val % den; uintmax qnum = q * num; uintmax rnum = r * num; uintmax quot = qnum + rnum / den; uintmax rem = rnum % den; return quot + (den / 2 < rem + (quot & ~den & 1)); } /* * Return the ratio of two POSITIONS, as a percentage. * {{ Assumes a POSITION is a long int. }} */ public int percentage(POSITION num, POSITION den) { return (int) muldiv(num, (POSITION) 100, den); } /* * Return the specified percentage of a POSITION. * Assume (0 <= POS && 0 <= PERCENT <= 100 * && 0 <= FRACTION < (PERCENT == 100 ? 1 : NUM_FRAC_DENOM)), * so the result cannot overflow. Round to even. */ public POSITION percent_pos(POSITION pos, int percent, long fraction) { /* * Change from percent (parts per 100) * to pctden (parts per 100 * NUM_FRAC_DENOM). */ POSITION pctden = (percent * NUM_FRAC_DENOM) + fraction; return (POSITION) muldiv(pos, pctden, 100 * (POSITION) NUM_FRAC_DENOM); } #if !HAVE_STRCHR /* * strchr is used by regexp.c. */ char * strchr(char *s, char c) { for ( ; *s != '\0'; s++) if (*s == c) return (s); if (c == '\0') return (s); return (NULL); } #endif #if !HAVE_MEMCPY void * memcpy(void *dst, void *src, int len) { char *dstp = (char *) dst; char *srcp = (char *) src; int i; for (i = 0; i < len; i++) dstp[i] = srcp[i]; return (dst); } #endif #ifdef _OSK_MWC32 /* * This implements an ANSI-style intercept setup for Microware C 3.2 */ public int os9_signal(int type, RETSIGTYPE (*handler)()) { intercept(handler); } #include int isatty(int f) { struct sgbuf sgbuf; if (_gs_opt(f, &sgbuf) < 0) return -1; return (sgbuf.sg_class == 0); } #endif public void sleep_ms(int ms) { #if MSDOS_COMPILER==WIN32C Sleep(ms); #else #if HAVE_NANOSLEEP int sec = ms / 1000; struct timespec t = { sec, (ms - sec*1000) * 1000000 }; nanosleep(&t, NULL); #else #if HAVE_USLEEP usleep(ms); #else sleep(ms / 1000 + (ms % 1000 != 0)); #endif #endif #endif } diff --git a/contrib/less/screen.c b/contrib/less/screen.c index 6b389d7b0df0..8b15b7fdd8de 100644 --- a/contrib/less/screen.c +++ b/contrib/less/screen.c @@ -1,2987 +1,3018 @@ /* * Copyright (C) 1984-2023 Mark Nudelman * * You may distribute under the terms of either the GNU General Public * License or the Less License, as specified in the README file. * * For more information, see the README file. */ /* * Routines which deal with the characteristics of the terminal. * Uses termcap to be as terminal-independent as possible. */ #include "less.h" #include "cmd.h" #if MSDOS_COMPILER #include "pckeys.h" #if MSDOS_COMPILER==MSOFTC #include #else #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC #include #if MSDOS_COMPILER==DJGPPC #include extern int fd0; #endif #else #if MSDOS_COMPILER==WIN32C #include #endif #endif #endif #include #ifndef FOREGROUND_BLUE #define FOREGROUND_BLUE 0x0001 #endif #ifndef FOREGROUND_GREEN #define FOREGROUND_GREEN 0x0002 #endif #ifndef FOREGROUND_RED #define FOREGROUND_RED 0x0004 #endif #ifndef FOREGROUND_INTENSITY #define FOREGROUND_INTENSITY 0x0008 #endif #else #if HAVE_SYS_IOCTL_H #include #endif #if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS #include #else #if HAVE_TERMIO_H #include #else #if HAVE_SGSTAT_H #include #else #include #endif #endif #endif +#if HAVE_NCURSESW_TERMCAP_H +#include +#else +#if HAVE_NCURSES_TERMCAP_H +#include +#else #if HAVE_TERMCAP_H #include #endif +#endif +#endif #ifdef _OSK #include #endif #if OS2 #include #include "pckeys.h" #endif #if HAVE_SYS_STREAM_H #include #endif #if HAVE_SYS_PTEM_H #include #endif #endif /* MSDOS_COMPILER */ /* * Check for broken termios package that forces you to manually * set the line discipline. */ #ifdef __ultrix__ #define MUST_SET_LINE_DISCIPLINE 1 #else #define MUST_SET_LINE_DISCIPLINE 0 #endif #if OS2 #define DEFAULT_TERM "ansi" static char *windowid; #else #define DEFAULT_TERM "unknown" #endif #if MSDOS_COMPILER==MSOFTC static int videopages; static long msec_loops; static int flash_created = 0; #define SET_FG_COLOR(fg) _settextcolor(fg) #define SET_BG_COLOR(bg) _setbkcolor(bg) #define SETCOLORS(fg,bg) { SET_FG_COLOR(fg); SET_BG_COLOR(bg); } #endif #if MSDOS_COMPILER==BORLANDC static unsigned short *whitescreen; static int flash_created = 0; #endif #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC #define _settextposition(y,x) gotoxy(x,y) #define _clearscreen(m) clrscr() #define _outtext(s) cputs(s) #define SET_FG_COLOR(fg) textcolor(fg) #define SET_BG_COLOR(bg) textbackground(bg) #define SETCOLORS(fg,bg) { SET_FG_COLOR(fg); SET_BG_COLOR(bg); } extern int sc_height; #endif #if MSDOS_COMPILER==WIN32C #define UTF8_MAX_LENGTH 4 struct keyRecord { WCHAR unicode; int ascii; int scan; } currentKey; static int keyCount = 0; static WORD curr_attr; static int pending_scancode = 0; static char x11mousebuf[] = "[M???"; /* Mouse report, after ESC */ static int x11mousePos, x11mouseCount; +static int win_unget_pending = FALSE; +static int win_unget_data; static HANDLE con_out_save = INVALID_HANDLE_VALUE; /* previous console */ static HANDLE con_out_ours = INVALID_HANDLE_VALUE; /* our own */ HANDLE con_out = INVALID_HANDLE_VALUE; /* current console */ extern int utf_mode; extern int quitting; static void win32_init_term(); static void win32_deinit_term(); #ifndef ENABLE_VIRTUAL_TERMINAL_PROCESSING #define ENABLE_VIRTUAL_TERMINAL_PROCESSING 4 #endif #define FG_COLORS (FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE | FOREGROUND_INTENSITY) #define BG_COLORS (BACKGROUND_RED | BACKGROUND_GREEN | BACKGROUND_BLUE | BACKGROUND_INTENSITY) #define MAKEATTR(fg,bg) ((WORD)((fg)|((bg)<<4))) #define APPLY_COLORS() { if (SetConsoleTextAttribute(con_out, curr_attr) == 0) \ error("SETCOLORS failed", NULL_PARG); } -#define SET_FG_COLOR(fg) { curr_attr |= (fg); APPLY_COLORS(); } -#define SET_BG_COLOR(bg) { curr_attr |= ((bg)<<4); APPLY_COLORS(); } +#define SET_FG_COLOR(fg) { curr_attr &= ~0x0f; curr_attr |= (fg); APPLY_COLORS(); } +#define SET_BG_COLOR(bg) { curr_attr &= ~0xf0; curr_attr |= ((bg)<<4); APPLY_COLORS(); } #define SETCOLORS(fg,bg) { curr_attr = MAKEATTR(fg,bg); APPLY_COLORS(); } #endif #if MSDOS_COMPILER public int nm_fg_color; /* Color of normal text */ public int nm_bg_color; public int bo_fg_color; /* Color of bold text */ public int bo_bg_color; public int ul_fg_color; /* Color of underlined text */ public int ul_bg_color; public int so_fg_color; /* Color of standout text */ public int so_bg_color; public int bl_fg_color; /* Color of blinking text */ public int bl_bg_color; static int sy_fg_color; /* Color of system text (before less) */ static int sy_bg_color; public int sgr_mode; /* Honor ANSI sequences rather than using above */ #if MSDOS_COMPILER==WIN32C static DWORD init_output_mode; /* The initial console output mode */ public int vt_enabled = -1; /* Is virtual terminal processing available? */ #endif #else /* * Strings passed to tputs() to do various terminal functions. */ static char *sc_pad, /* Pad string */ *sc_home, /* Cursor home */ *sc_addline, /* Add line, scroll down following lines */ *sc_lower_left, /* Cursor to last line, first column */ *sc_return, /* Cursor to beginning of current line */ *sc_move, /* General cursor positioning */ *sc_clear, /* Clear screen */ *sc_eol_clear, /* Clear to end of line */ *sc_eos_clear, /* Clear to end of screen */ *sc_s_in, /* Enter standout (highlighted) mode */ *sc_s_out, /* Exit standout mode */ *sc_u_in, /* Enter underline mode */ *sc_u_out, /* Exit underline mode */ *sc_b_in, /* Enter bold mode */ *sc_b_out, /* Exit bold mode */ *sc_bl_in, /* Enter blink mode */ *sc_bl_out, /* Exit blink mode */ *sc_visual_bell, /* Visual bell (flash screen) sequence */ *sc_backspace, /* Backspace cursor */ *sc_s_keypad, /* Start keypad mode */ *sc_e_keypad, /* End keypad mode */ *sc_s_mousecap, /* Start mouse capture mode */ *sc_e_mousecap, /* End mouse capture mode */ *sc_init, /* Startup terminal initialization */ *sc_deinit; /* Exit terminal de-initialization */ static int attrcolor = -1; #endif static int init_done = 0; public int auto_wrap; /* Terminal does \r\n when write past margin */ public int ignaw; /* Terminal ignores \n immediately after wrap */ public int erase_char; /* The user's erase char */ public int erase2_char; /* The user's other erase char */ public int kill_char; /* The user's line-kill char */ public int werase_char; /* The user's word-erase char */ public int sc_width, sc_height; /* Height & width of screen */ public int bo_s_width, bo_e_width; /* Printing width of boldface seq */ public int ul_s_width, ul_e_width; /* Printing width of underline seq */ public int so_s_width, so_e_width; /* Printing width of standout seq */ public int bl_s_width, bl_e_width; /* Printing width of blink seq */ public int above_mem, below_mem; /* Memory retained above/below screen */ public int can_goto_line; /* Can move cursor to any line */ public int clear_bg; /* Clear fills with background color */ public int missing_cap = 0; /* Some capability is missing */ public char *kent = NULL; /* Keypad ENTER sequence */ public int term_init_done = FALSE; public int full_screen = TRUE; static int attrmode = AT_NORMAL; static int termcap_debug = -1; static int no_alt_screen; /* sc_init does not switch to alt screen */ extern int binattr; extern int one_screen; #if LESSTEST extern char *ttyin_name; #endif /*LESSTEST*/ #if !MSDOS_COMPILER static char *cheaper(char *t1, char *t2, char *def); static void tmodes(char *incap, char *outcap, char **instr, char **outstr, char *def_instr, char *def_outstr, char **spp); #endif /* * These two variables are sometimes defined in, * and needed by, the termcap library. */ #if MUST_DEFINE_OSPEED extern short ospeed; /* Terminal output baud rate */ extern char PC; /* Pad character */ #endif #ifdef _OSK short ospeed; char PC_, *UP, *BC; #endif extern int quiet; /* If VERY_QUIET, use visual bell for bell */ extern int no_vbell; extern int no_back_scroll; extern int swindow; extern int no_init; extern int no_keypad; extern int sigs; extern int wscroll; extern int screen_trashed; extern int top_scroll; extern int quit_if_one_screen; extern int oldbot; extern int mousecap; extern int is_tty; extern int use_color; #if HILITE_SEARCH extern int hilite_search; #endif #if MSDOS_COMPILER==WIN32C extern HANDLE tty; extern DWORD console_mode; #ifndef ENABLE_EXTENDED_FLAGS #define ENABLE_EXTENDED_FLAGS 0x80 #define ENABLE_QUICK_EDIT_MODE 0x40 #endif #else extern int tty; #endif #if (HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS) || defined(TCGETA) /* * Set termio flags for use by less. */ static void set_termio_flags( #if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS struct termios *s #else struct termio *s #endif ) { s->c_lflag &= ~(0 #ifdef ICANON | ICANON #endif #ifdef ECHO | ECHO #endif #ifdef ECHOE | ECHOE #endif #ifdef ECHOK | ECHOK #endif -#if ECHONL +#ifdef ECHONL | ECHONL #endif ); s->c_oflag |= (0 #ifdef OXTABS | OXTABS #else #ifdef TAB3 | TAB3 #else #ifdef XTABS | XTABS #endif #endif #endif #ifdef OPOST | OPOST #endif #ifdef ONLCR | ONLCR #endif ); s->c_oflag &= ~(0 #ifdef ONOEOT | ONOEOT #endif #ifdef OCRNL | OCRNL #endif #ifdef ONOCR | ONOCR #endif #ifdef ONLRET | ONLRET #endif ); } #endif /* * Change terminal to "raw mode", or restore to "normal" mode. * "Raw mode" means * 1. An outstanding read will complete on receipt of a single keystroke. * 2. Input is not echoed. * 3. On output, \n is mapped to \r\n. * 4. \t is NOT expanded into spaces. * 5. Signal-causing characters such as ctrl-C (interrupt), * etc. are NOT disabled. * It doesn't matter whether an input \n is mapped to \r, or vice versa. */ public void raw_mode(int on) { static int curr_on = 0; if (on == curr_on) return; erase2_char = '\b'; /* in case OS doesn't know about erase2 */ #if LESSTEST if (ttyin_name != NULL) { /* {{ For consistent conditions when running tests. }} */ erase_char = '\b'; kill_char = CONTROL('U'); werase_char = CONTROL('W'); } else #endif /*LESSTEST*/ #if HAVE_TERMIOS_H && HAVE_TERMIOS_FUNCS { struct termios s; static struct termios save_term; static int saved_term = 0; if (on) { /* * Get terminal modes. */ if (tcgetattr(tty, &s) < 0) { erase_char = '\b'; kill_char = CONTROL('U'); werase_char = CONTROL('W'); } else { /* * Save modes and set certain variables dependent on modes. */ if (!saved_term) { save_term = s; saved_term = 1; } #if HAVE_OSPEED switch (cfgetospeed(&s)) { #ifdef B0 case B0: ospeed = 0; break; #endif #ifdef B50 case B50: ospeed = 1; break; #endif #ifdef B75 case B75: ospeed = 2; break; #endif #ifdef B110 case B110: ospeed = 3; break; #endif #ifdef B134 case B134: ospeed = 4; break; #endif #ifdef B150 case B150: ospeed = 5; break; #endif #ifdef B200 case B200: ospeed = 6; break; #endif #ifdef B300 case B300: ospeed = 7; break; #endif #ifdef B600 case B600: ospeed = 8; break; #endif #ifdef B1200 case B1200: ospeed = 9; break; #endif #ifdef B1800 case B1800: ospeed = 10; break; #endif #ifdef B2400 case B2400: ospeed = 11; break; #endif #ifdef B4800 case B4800: ospeed = 12; break; #endif #ifdef B9600 case B9600: ospeed = 13; break; #endif #ifdef EXTA case EXTA: ospeed = 14; break; #endif #ifdef EXTB case EXTB: ospeed = 15; break; #endif #ifdef B57600 case B57600: ospeed = 16; break; #endif #ifdef B115200 case B115200: ospeed = 17; break; #endif default: ; } #endif erase_char = s.c_cc[VERASE]; #ifdef VERASE2 erase2_char = s.c_cc[VERASE2]; #endif kill_char = s.c_cc[VKILL]; #ifdef VWERASE werase_char = s.c_cc[VWERASE]; #else werase_char = CONTROL('W'); #endif /* * Set the modes to the way we want them. */ set_termio_flags(&s); s.c_cc[VMIN] = 1; s.c_cc[VTIME] = 0; #ifdef VLNEXT s.c_cc[VLNEXT] = 0; #endif #ifdef VDSUSP s.c_cc[VDSUSP] = 0; #endif #ifdef VSTOP s.c_cc[VSTOP] = 0; #endif #ifdef VSTART s.c_cc[VSTART] = 0; #endif #if MUST_SET_LINE_DISCIPLINE /* * System's termios is broken; need to explicitly * request TERMIODISC line discipline. */ s.c_line = TERMIODISC; #endif } } else { /* * Restore saved modes. */ s = save_term; } #if HAVE_FSYNC fsync(tty); #endif tcsetattr(tty, TCSADRAIN, &s); #if MUST_SET_LINE_DISCIPLINE if (!on) { /* * Broken termios *ignores* any line discipline * except TERMIODISC. A different old line discipline * is therefore not restored, yet. Restore the old * line discipline by hand. */ ioctl(tty, TIOCSETD, &save_term.c_line); } #endif } #else #ifdef TCGETA { struct termio s; static struct termio save_term; static int saved_term = 0; if (on) { /* * Get terminal modes. */ ioctl(tty, TCGETA, &s); /* * Save modes and set certain variables dependent on modes. */ if (!saved_term) { save_term = s; saved_term = 1; } #if HAVE_OSPEED ospeed = s.c_cflag & CBAUD; #endif erase_char = s.c_cc[VERASE]; kill_char = s.c_cc[VKILL]; #ifdef VWERASE werase_char = s.c_cc[VWERASE]; #else werase_char = CONTROL('W'); #endif /* * Set the modes to the way we want them. */ set_termio_flags(&s); s.c_cc[VMIN] = 1; s.c_cc[VTIME] = 0; #ifdef VSTOP s.c_cc[VSTOP] = 0; #endif #ifdef VSTART s.c_cc[VSTART] = 0; #endif } else { /* * Restore saved modes. */ s = save_term; } ioctl(tty, TCSETAW, &s); } #else #ifdef TIOCGETP { struct sgttyb s; static struct sgttyb save_term; static int saved_term = 0; if (on) { /* * Get terminal modes. */ ioctl(tty, TIOCGETP, &s); /* * Save modes and set certain variables dependent on modes. */ if (!saved_term) { save_term = s; saved_term = 1; } #if HAVE_OSPEED ospeed = s.sg_ospeed; #endif erase_char = s.sg_erase; kill_char = s.sg_kill; werase_char = CONTROL('W'); /* * Set the modes to the way we want them. */ s.sg_flags |= CBREAK; s.sg_flags &= ~(ECHO|XTABS); } else { /* * Restore saved modes. */ s = save_term; } ioctl(tty, TIOCSETN, &s); } #else #ifdef _OSK { struct sgbuf s; static struct sgbuf save_term; static int saved_term = 0; if (on) { /* * Get terminal modes. */ _gs_opt(tty, &s); /* * Save modes and set certain variables dependent on modes. */ if (!saved_term) { save_term = s; saved_term = 1; } erase_char = s.sg_bspch; kill_char = s.sg_dlnch; werase_char = CONTROL('W'); /* * Set the modes to the way we want them. */ s.sg_echo = 0; s.sg_eofch = 0; s.sg_pause = 0; s.sg_psch = 0; } else { /* * Restore saved modes. */ s = save_term; } _ss_opt(tty, &s); } #else /* MS-DOS, Windows, or OS2 */ #if OS2 /* OS2 */ LSIGNAL(SIGINT, SIG_IGN); #endif erase_char = '\b'; #if MSDOS_COMPILER==DJGPPC kill_char = CONTROL('U'); /* * So that when we shell out or run another program, its * stdin is in cooked mode. We do not switch stdin to binary * mode if fd0 is zero, since that means we were called before * tty was reopened in open_getchr, in which case we would be * changing the original stdin device outside less. */ if (fd0 != 0) setmode(0, on ? O_BINARY : O_TEXT); #else kill_char = ESC; #endif werase_char = CONTROL('W'); #endif #endif #endif #endif curr_on = on; } #if !MSDOS_COMPILER /* * Some glue to prevent calling termcap functions if tgetent() failed. */ static int hardcopy; static char * ltget_env(char *capname) { char name[64]; if (termcap_debug) { struct env { struct env *next; char *name; char *value; }; static struct env *envs = NULL; struct env *p; for (p = envs; p != NULL; p = p->next) if (strcmp(p->name, capname) == 0) return p->value; p = (struct env *) ecalloc(1, sizeof(struct env)); p->name = save(capname); p->value = (char *) ecalloc(strlen(capname)+3, sizeof(char)); sprintf(p->value, "<%s>", capname); p->next = envs; envs = p; return p->value; } SNPRINTF1(name, sizeof(name), "LESS_TERMCAP_%s", capname); return (lgetenv(name)); } static int ltgetflag(char *capname) { char *s; if ((s = ltget_env(capname)) != NULL) return (*s != '\0' && *s != '0'); if (hardcopy) return (0); return (tgetflag(capname)); } static int ltgetnum(char *capname) { char *s; if ((s = ltget_env(capname)) != NULL) return (atoi(s)); if (hardcopy) return (-1); return (tgetnum(capname)); } static char * ltgetstr(char *capname, char **pp) { char *s; if ((s = ltget_env(capname)) != NULL) return (s); if (hardcopy) return (NULL); return (tgetstr(capname, pp)); } #endif /* MSDOS_COMPILER */ /* * Get size of the output screen. */ public void scrsize(void) { char *s; int sys_height; int sys_width; #if !MSDOS_COMPILER int n; #endif #define DEF_SC_WIDTH 80 #if MSDOS_COMPILER #define DEF_SC_HEIGHT 25 #else #define DEF_SC_HEIGHT 24 #endif sys_width = sys_height = 0; #if LESSTEST if (ttyin_name != NULL) #endif /*LESSTEST*/ { #if MSDOS_COMPILER==MSOFTC { struct videoconfig w; _getvideoconfig(&w); sys_height = w.numtextrows; sys_width = w.numtextcols; } #else #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC { struct text_info w; gettextinfo(&w); sys_height = w.screenheight; sys_width = w.screenwidth; } #else #if MSDOS_COMPILER==WIN32C { CONSOLE_SCREEN_BUFFER_INFO scr; GetConsoleScreenBufferInfo(con_out, &scr); sys_height = scr.srWindow.Bottom - scr.srWindow.Top + 1; sys_width = scr.srWindow.Right - scr.srWindow.Left + 1; } #else #if OS2 { int s[2]; _scrsize(s); sys_width = s[0]; sys_height = s[1]; /* * When using terminal emulators for XFree86/OS2, the * _scrsize function does not work well. * Call the scrsize.exe program to get the window size. */ windowid = getenv("WINDOWID"); if (windowid != NULL) { FILE *fd = popen("scrsize", "rt"); if (fd != NULL) { int w, h; fscanf(fd, "%i %i", &w, &h); if (w > 0 && h > 0) { sys_width = w; sys_height = h; } pclose(fd); } } } #else #ifdef TIOCGWINSZ { struct winsize w; if (ioctl(2, TIOCGWINSZ, &w) == 0) { if (w.ws_row > 0) sys_height = w.ws_row; if (w.ws_col > 0) sys_width = w.ws_col; } } #else #ifdef WIOCGETD { struct uwdata w; if (ioctl(2, WIOCGETD, &w) == 0) { if (w.uw_height > 0) sys_height = w.uw_height / w.uw_vs; if (w.uw_width > 0) sys_width = w.uw_width / w.uw_hs; } } #endif #endif #endif #endif #endif #endif } if (sys_height > 0) sc_height = sys_height; else if ((s = lgetenv("LINES")) != NULL) sc_height = atoi(s); #if !MSDOS_COMPILER else if ((n = ltgetnum("li")) > 0) sc_height = n; #endif if ((s = lgetenv("LESS_LINES")) != NULL) { int height = atoi(s); sc_height = (height < 0) ? sc_height + height : height; full_screen = FALSE; } if (sc_height <= 0) sc_height = DEF_SC_HEIGHT; if (sys_width > 0) sc_width = sys_width; else if ((s = lgetenv("COLUMNS")) != NULL) sc_width = atoi(s); #if !MSDOS_COMPILER else if ((n = ltgetnum("co")) > 0) sc_width = n; #endif if ((s = lgetenv("LESS_COLUMNS")) != NULL) { int width = atoi(s); sc_width = (width < 0) ? sc_width + width : width; } if (sc_width <= 0) sc_width = DEF_SC_WIDTH; } #if MSDOS_COMPILER==MSOFTC /* * Figure out how many empty loops it takes to delay a millisecond. */ static void get_clock(void) { clock_t start; /* * Get synchronized at the start of a tick. */ start = clock(); while (clock() == start) ; /* * Now count loops till the next tick. */ start = clock(); msec_loops = 0; while (clock() == start) msec_loops++; /* * Convert from (loops per clock) to (loops per millisecond). */ msec_loops *= CLOCKS_PER_SEC; msec_loops /= 1000; } /* * Delay for a specified number of milliseconds. */ static void delay(int msec) { long i; while (msec-- > 0) { for (i = 0; i < msec_loops; i++) (void) clock(); } } #endif /* * Return the characters actually input by a "special" key. */ public char * special_key_str(int key) { static char tbuf[40]; char *s; #if MSDOS_COMPILER || OS2 static char k_right[] = { '\340', PCK_RIGHT, 0 }; static char k_left[] = { '\340', PCK_LEFT, 0 }; static char k_ctl_right[] = { '\340', PCK_CTL_RIGHT, 0 }; static char k_ctl_left[] = { '\340', PCK_CTL_LEFT, 0 }; static char k_insert[] = { '\340', PCK_INSERT, 0 }; static char k_delete[] = { '\340', PCK_DELETE, 0 }; static char k_ctl_delete[] = { '\340', PCK_CTL_DELETE, 0 }; static char k_ctl_backspace[] = { '\177', 0 }; static char k_backspace[] = { '\b', 0 }; static char k_home[] = { '\340', PCK_HOME, 0 }; static char k_end[] = { '\340', PCK_END, 0 }; static char k_up[] = { '\340', PCK_UP, 0 }; static char k_down[] = { '\340', PCK_DOWN, 0 }; static char k_backtab[] = { '\340', PCK_SHIFT_TAB, 0 }; static char k_pagedown[] = { '\340', PCK_PAGEDOWN, 0 }; static char k_pageup[] = { '\340', PCK_PAGEUP, 0 }; static char k_f1[] = { '\340', PCK_F1, 0 }; #endif #if !MSDOS_COMPILER char *sp = tbuf; #endif switch (key) { #if OS2 /* * If windowid is not NULL, assume less is executed in * the XFree86 environment. */ case SK_RIGHT_ARROW: s = windowid ? ltgetstr("kr", &sp) : k_right; break; case SK_LEFT_ARROW: s = windowid ? ltgetstr("kl", &sp) : k_left; break; case SK_UP_ARROW: s = windowid ? ltgetstr("ku", &sp) : k_up; break; case SK_DOWN_ARROW: s = windowid ? ltgetstr("kd", &sp) : k_down; break; case SK_PAGE_UP: s = windowid ? ltgetstr("kP", &sp) : k_pageup; break; case SK_PAGE_DOWN: s = windowid ? ltgetstr("kN", &sp) : k_pagedown; break; case SK_HOME: s = windowid ? ltgetstr("kh", &sp) : k_home; break; case SK_END: s = windowid ? ltgetstr("@7", &sp) : k_end; break; case SK_DELETE: s = windowid ? ltgetstr("kD", &sp) : k_delete; if (s == NULL) { tbuf[0] = '\177'; tbuf[1] = '\0'; s = tbuf; } break; #endif #if MSDOS_COMPILER case SK_RIGHT_ARROW: s = k_right; break; case SK_LEFT_ARROW: s = k_left; break; case SK_UP_ARROW: s = k_up; break; case SK_DOWN_ARROW: s = k_down; break; case SK_PAGE_UP: s = k_pageup; break; case SK_PAGE_DOWN: s = k_pagedown; break; case SK_HOME: s = k_home; break; case SK_END: s = k_end; break; case SK_DELETE: s = k_delete; break; #endif #if MSDOS_COMPILER || OS2 case SK_INSERT: s = k_insert; break; case SK_CTL_LEFT_ARROW: s = k_ctl_left; break; case SK_CTL_RIGHT_ARROW: s = k_ctl_right; break; case SK_CTL_BACKSPACE: s = k_ctl_backspace; break; case SK_CTL_DELETE: s = k_ctl_delete; break; case SK_BACKSPACE: s = k_backspace; break; case SK_F1: s = k_f1; break; case SK_BACKTAB: s = k_backtab; break; #else case SK_RIGHT_ARROW: s = ltgetstr("kr", &sp); break; case SK_LEFT_ARROW: s = ltgetstr("kl", &sp); break; case SK_UP_ARROW: s = ltgetstr("ku", &sp); break; case SK_DOWN_ARROW: s = ltgetstr("kd", &sp); break; case SK_PAGE_UP: s = ltgetstr("kP", &sp); break; case SK_PAGE_DOWN: s = ltgetstr("kN", &sp); break; case SK_HOME: s = ltgetstr("kh", &sp); break; case SK_END: s = ltgetstr("@7", &sp); break; case SK_DELETE: s = ltgetstr("kD", &sp); if (s == NULL) { tbuf[0] = '\177'; tbuf[1] = '\0'; s = tbuf; } break; case SK_BACKSPACE: s = ltgetstr("kb", &sp); if (s == NULL) { tbuf[0] = '\b'; tbuf[1] = '\0'; s = tbuf; } break; #endif case SK_CONTROL_K: tbuf[0] = CONTROL('K'); tbuf[1] = '\0'; s = tbuf; break; default: return (NULL); } return (s); } /* * Get terminal capabilities via termcap. */ public void get_term(void) { termcap_debug = !isnullenv(lgetenv("LESS_TERMCAP_DEBUG")); #if MSDOS_COMPILER auto_wrap = 1; ignaw = 0; can_goto_line = 1; clear_bg = 1; /* * Set up default colors. * The xx_s_width and xx_e_width vars are already initialized to 0. */ #if MSDOS_COMPILER==MSOFTC sy_bg_color = _getbkcolor(); sy_fg_color = _gettextcolor(); get_clock(); #else #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC { struct text_info w; gettextinfo(&w); sy_bg_color = (w.attribute >> 4) & 0x0F; sy_fg_color = (w.attribute >> 0) & 0x0F; } #else #if MSDOS_COMPILER==WIN32C { CONSOLE_SCREEN_BUFFER_INFO scr; con_out_save = con_out = GetStdHandle(STD_OUTPUT_HANDLE); /* * Always open stdin in binary. Note this *must* be done * before any file operations have been done on fd0. */ SET_BINARY(0); GetConsoleMode(con_out, &init_output_mode); GetConsoleScreenBufferInfo(con_out, &scr); curr_attr = scr.wAttributes; sy_bg_color = (curr_attr & BG_COLORS) >> 4; /* normalize */ sy_fg_color = curr_attr & FG_COLORS; } #endif #endif #endif nm_fg_color = sy_fg_color; nm_bg_color = sy_bg_color; bo_fg_color = 11; bo_bg_color = 0; ul_fg_color = 9; ul_bg_color = 0; so_fg_color = 15; so_bg_color = 9; bl_fg_color = 15; bl_bg_color = 0; sgr_mode = 0; /* * Get size of the screen. */ scrsize(); pos_init(); #else /* !MSDOS_COMPILER */ { char *sp; char *t1, *t2; char *term; /* * Some termcap libraries assume termbuf is static * (accessible after tgetent returns). */ static char termbuf[TERMBUF_SIZE]; static char sbuf[TERMSBUF_SIZE]; #if OS2 /* * Make sure the termcap database is available. */ sp = lgetenv("TERMCAP"); if (isnullenv(sp)) { char *termcap; if ((sp = homefile("termcap.dat")) != NULL) { termcap = (char *) ecalloc(strlen(sp)+9, sizeof(char)); sprintf(termcap, "TERMCAP=%s", sp); free(sp); putenv(termcap); } } #endif /* * Find out what kind of terminal this is. */ if ((term = lgetenv("TERM")) == NULL) term = DEFAULT_TERM; hardcopy = 0; /* {{ Should probably just pass NULL instead of termbuf. }} */ if (tgetent(termbuf, term) != TGETENT_OK) hardcopy = 1; if (ltgetflag("hc")) hardcopy = 1; /* * Get size of the screen. */ scrsize(); pos_init(); auto_wrap = ltgetflag("am"); ignaw = ltgetflag("xn"); above_mem = ltgetflag("da"); below_mem = ltgetflag("db"); clear_bg = ltgetflag("ut"); no_alt_screen = ltgetflag("NR"); /* * Assumes termcap variable "sg" is the printing width of: * the standout sequence, the end standout sequence, * the underline sequence, the end underline sequence, * the boldface sequence, and the end boldface sequence. */ if ((so_s_width = ltgetnum("sg")) < 0) so_s_width = 0; so_e_width = so_s_width; bo_s_width = bo_e_width = so_s_width; ul_s_width = ul_e_width = so_s_width; bl_s_width = bl_e_width = so_s_width; #if HILITE_SEARCH if (so_s_width > 0 || so_e_width > 0) /* * Disable highlighting by default on magic cookie terminals. * Turning on highlighting might change the displayed width * of a line, causing the display to get messed up. * The user can turn it back on with -g, * but she won't like the results. */ hilite_search = 0; #endif /* * Get various string-valued capabilities. */ sp = sbuf; #if HAVE_OSPEED sc_pad = ltgetstr("pc", &sp); if (sc_pad != NULL) PC = *sc_pad; #endif sc_s_keypad = ltgetstr("ks", &sp); if (sc_s_keypad == NULL) sc_s_keypad = ""; sc_e_keypad = ltgetstr("ke", &sp); if (sc_e_keypad == NULL) sc_e_keypad = ""; kent = ltgetstr("@8", &sp); sc_s_mousecap = ltgetstr("MOUSE_START", &sp); if (sc_s_mousecap == NULL) sc_s_mousecap = ESCS "[?1000h" ESCS "[?1006h"; sc_e_mousecap = ltgetstr("MOUSE_END", &sp); if (sc_e_mousecap == NULL) sc_e_mousecap = ESCS "[?1006l" ESCS "[?1000l"; sc_init = ltgetstr("ti", &sp); if (sc_init == NULL) sc_init = ""; sc_deinit= ltgetstr("te", &sp); if (sc_deinit == NULL) sc_deinit = ""; sc_eol_clear = ltgetstr("ce", &sp); if (sc_eol_clear == NULL || *sc_eol_clear == '\0') { missing_cap = 1; sc_eol_clear = ""; } sc_eos_clear = ltgetstr("cd", &sp); if (below_mem && (sc_eos_clear == NULL || *sc_eos_clear == '\0')) { missing_cap = 1; sc_eos_clear = ""; } sc_clear = ltgetstr("cl", &sp); if (sc_clear == NULL || *sc_clear == '\0') { missing_cap = 1; sc_clear = "\n\n"; } sc_move = ltgetstr("cm", &sp); if (sc_move == NULL || *sc_move == '\0') { /* * This is not an error here, because we don't * always need sc_move. * We need it only if we don't have home or lower-left. */ sc_move = ""; can_goto_line = 0; } else can_goto_line = 1; tmodes("so", "se", &sc_s_in, &sc_s_out, "", "", &sp); tmodes("us", "ue", &sc_u_in, &sc_u_out, sc_s_in, sc_s_out, &sp); tmodes("md", "me", &sc_b_in, &sc_b_out, sc_s_in, sc_s_out, &sp); tmodes("mb", "me", &sc_bl_in, &sc_bl_out, sc_s_in, sc_s_out, &sp); sc_visual_bell = ltgetstr("vb", &sp); if (sc_visual_bell == NULL) sc_visual_bell = ""; if (ltgetflag("bs")) sc_backspace = "\b"; else { sc_backspace = ltgetstr("bc", &sp); if (sc_backspace == NULL || *sc_backspace == '\0') sc_backspace = "\b"; } /* * Choose between using "ho" and "cm" ("home" and "cursor move") * to move the cursor to the upper left corner of the screen. */ t1 = ltgetstr("ho", &sp); if (t1 == NULL) t1 = ""; if (*sc_move == '\0') t2 = ""; else { strcpy(sp, tgoto(sc_move, 0, 0)); t2 = sp; sp += strlen(sp) + 1; } sc_home = cheaper(t1, t2, "|\b^"); /* * Choose between using "ll" and "cm" ("lower left" and "cursor move") * to move the cursor to the lower left corner of the screen. */ t1 = ltgetstr("ll", &sp); if (t1 == NULL || !full_screen) t1 = ""; if (*sc_move == '\0') t2 = ""; else { strcpy(sp, tgoto(sc_move, 0, sc_height-1)); t2 = sp; sp += strlen(sp) + 1; } sc_lower_left = cheaper(t1, t2, "\r"); /* * Get carriage return string. */ sc_return = ltgetstr("cr", &sp); if (sc_return == NULL) sc_return = "\r"; /* * Choose between using "al" or "sr" ("add line" or "scroll reverse") * to add a line at the top of the screen. */ t1 = ltgetstr("al", &sp); if (t1 == NULL) t1 = ""; t2 = ltgetstr("sr", &sp); if (t2 == NULL) t2 = ""; #if OS2 if (*t1 == '\0' && *t2 == '\0') sc_addline = ""; else #endif if (above_mem) sc_addline = t1; else sc_addline = cheaper(t1, t2, ""); if (*sc_addline == '\0') { /* * Force repaint on any backward movement. */ no_back_scroll = 1; } } #endif /* MSDOS_COMPILER */ } #if !MSDOS_COMPILER /* * Return the cost of displaying a termcap string. * We use the trick of calling tputs, but as a char printing function * we give it inc_costcount, which just increments "costcount". * This tells us how many chars would be printed by using this string. * {{ Couldn't we just use strlen? }} */ static int costcount; /*ARGSUSED*/ static int inc_costcount(int c) { costcount++; return (c); } static int cost(char *t) { costcount = 0; tputs(t, sc_height, inc_costcount); return (costcount); } /* * Return the "best" of the two given termcap strings. * The best, if both exist, is the one with the lower * cost (see cost() function). */ static char * cheaper(char *t1, char *t2, char *def) { if (*t1 == '\0' && *t2 == '\0') { missing_cap = 1; return (def); } if (*t1 == '\0') return (t2); if (*t2 == '\0') return (t1); if (cost(t1) < cost(t2)) return (t1); return (t2); } static void tmodes(char *incap, char *outcap, char **instr, char **outstr, char *def_instr, char *def_outstr, char **spp) { *instr = ltgetstr(incap, spp); if (*instr == NULL) { /* Use defaults. */ *instr = def_instr; *outstr = def_outstr; return; } *outstr = ltgetstr(outcap, spp); if (*outstr == NULL) /* No specific out capability; use "me". */ *outstr = ltgetstr("me", spp); if (*outstr == NULL) /* Don't even have "me"; use a null string. */ *outstr = ""; } #endif /* MSDOS_COMPILER */ /* * Below are the functions which perform all the * terminal-specific screen manipulation. */ #if MSDOS_COMPILER #if MSDOS_COMPILER==WIN32C static void _settextposition(int row, int col) { COORD cpos; CONSOLE_SCREEN_BUFFER_INFO csbi; GetConsoleScreenBufferInfo(con_out, &csbi); cpos.X = csbi.srWindow.Left + (col - 1); cpos.Y = csbi.srWindow.Top + (row - 1); SetConsoleCursorPosition(con_out, cpos); } #endif /* * Initialize the screen to the correct color at startup. */ static void initcolor(void) { #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC intensevideo(); #endif SETCOLORS(nm_fg_color, nm_bg_color); #if 0 /* * This clears the screen at startup. This is different from * the behavior of other versions of less. Disable it for now. */ char *blanks; int row; int col; /* * Create a complete, blank screen using "normal" colors. */ SETCOLORS(nm_fg_color, nm_bg_color); blanks = (char *) ecalloc(width+1, sizeof(char)); for (col = 0; col < sc_width; col++) blanks[col] = ' '; blanks[sc_width] = '\0'; for (row = 0; row < sc_height; row++) _outtext(blanks); free(blanks); #endif } #endif #if MSDOS_COMPILER==WIN32C /* * Enable virtual terminal processing, if available. */ static void win32_init_vt_term(void) { DWORD output_mode; if (vt_enabled == 0 || (vt_enabled == 1 && con_out == con_out_ours)) return; GetConsoleMode(con_out, &output_mode); vt_enabled = SetConsoleMode(con_out, output_mode | ENABLE_VIRTUAL_TERMINAL_PROCESSING); if (vt_enabled) { auto_wrap = 0; ignaw = 1; } } static void win32_deinit_vt_term(void) { if (vt_enabled == 1 && con_out == con_out_save) SetConsoleMode(con_out, init_output_mode); } /* * Termcap-like init with a private win32 console. */ static void win32_init_term(void) { CONSOLE_SCREEN_BUFFER_INFO scr; COORD size; if (con_out_save == INVALID_HANDLE_VALUE) return; GetConsoleScreenBufferInfo(con_out_save, &scr); if (con_out_ours == INVALID_HANDLE_VALUE) { /* * Create our own screen buffer, so that we * may restore the original when done. */ con_out_ours = CreateConsoleScreenBuffer( GENERIC_WRITE | GENERIC_READ, FILE_SHARE_WRITE | FILE_SHARE_READ, (LPSECURITY_ATTRIBUTES) NULL, CONSOLE_TEXTMODE_BUFFER, (LPVOID) NULL); } size.X = scr.srWindow.Right - scr.srWindow.Left + 1; size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1; SetConsoleScreenBufferSize(con_out_ours, size); SetConsoleActiveScreenBuffer(con_out_ours); con_out = con_out_ours; } /* * Restore the startup console. */ static void win32_deinit_term(void) { if (con_out_save == INVALID_HANDLE_VALUE) return; if (quitting) (void) CloseHandle(con_out_ours); SetConsoleActiveScreenBuffer(con_out_save); con_out = con_out_save; } #endif #if !MSDOS_COMPILER static void do_tputs(char *str, int affcnt, int (*f_putc)(int)) { #if LESSTEST if (ttyin_name != NULL && f_putc == putchr) putstr(str); else #endif /*LESSTEST*/ tputs(str, affcnt, f_putc); } /* * Like tputs but we handle $<...> delay strings here because * some implementations of tputs don't perform delays correctly. */ static void ltputs(char *str, int affcnt, int (*f_putc)(int)) { while (str != NULL && *str != '\0') { #if HAVE_STRSTR char *obrac = strstr(str, "$<"); if (obrac != NULL) { char str2[64]; int slen = obrac - str; if (slen < sizeof(str2)) { int delay; /* Output first part of string (before "$<"). */ memcpy(str2, str, slen); str2[slen] = '\0'; do_tputs(str2, affcnt, f_putc); str += slen + 2; /* Perform the delay. */ delay = lstrtoi(str, &str, 10); if (*str == '*') if (ckd_mul(&delay, delay, affcnt)) delay = INT_MAX; flush(); sleep_ms(delay); /* Skip past closing ">" at end of delay string. */ str = strstr(str, ">"); if (str != NULL) str++; continue; } } #endif /* Pass the rest of the string to tputs and we're done. */ do_tputs(str, affcnt, f_putc); break; } } #endif /* MSDOS_COMPILER */ /* - * Configure the termimal so mouse clicks and wheel moves + * Configure the terminal so mouse clicks and wheel moves * produce input to less. */ public void init_mouse(void) { #if !MSDOS_COMPILER ltputs(sc_s_mousecap, sc_height, putchr); #else #if MSDOS_COMPILER==WIN32C SetConsoleMode(tty, ENABLE_PROCESSED_INPUT | ENABLE_MOUSE_INPUT | ENABLE_EXTENDED_FLAGS /* disable quick edit */); #endif #endif } /* * Configure the terminal so mouse clicks and wheel moves * are handled by the system (so text can be selected, etc). */ public void deinit_mouse(void) { #if !MSDOS_COMPILER ltputs(sc_e_mousecap, sc_height, putchr); #else #if MSDOS_COMPILER==WIN32C SetConsoleMode(tty, ENABLE_PROCESSED_INPUT | ENABLE_EXTENDED_FLAGS | (console_mode & ENABLE_QUICK_EDIT_MODE)); #endif #endif } /* * Initialize terminal */ public void init(void) { clear_bot_if_needed(); #if !MSDOS_COMPILER if (!(quit_if_one_screen && one_screen)) { if (!no_init) { ltputs(sc_init, sc_height, putchr); /* * Some terminals leave the cursor unmoved when switching * to the alt screen. To avoid having the text appear at * a seemingly random line on the alt screen, move to * lower left if we are using an alt screen. */ if (*sc_init != '\0' && *sc_deinit != '\0' && !no_alt_screen) lower_left(); term_init_done = 1; } if (!no_keypad) ltputs(sc_s_keypad, sc_height, putchr); if (mousecap) init_mouse(); } init_done = 1; if (top_scroll) { int i; /* * This is nice to terminals with no alternate screen, * but with saved scrolled-off-the-top lines. This way, * no previous line is lost, but we start with a whole * screen to ourself. */ for (i = 1; i < sc_height; i++) putchr('\n'); } else line_left(); #else #if MSDOS_COMPILER==WIN32C if (!(quit_if_one_screen && one_screen)) { if (!no_init) { win32_init_term(); term_init_done = 1; } if (mousecap) init_mouse(); } win32_init_vt_term(); #endif init_done = 1; initcolor(); flush(); #endif } /* * Deinitialize terminal */ public void deinit(void) { if (!init_done) return; #if !MSDOS_COMPILER if (!(quit_if_one_screen && one_screen)) { if (mousecap) deinit_mouse(); if (!no_keypad) ltputs(sc_e_keypad, sc_height, putchr); if (!no_init) ltputs(sc_deinit, sc_height, putchr); } #else /* Restore system colors. */ SETCOLORS(sy_fg_color, sy_bg_color); #if MSDOS_COMPILER==WIN32C win32_deinit_vt_term(); if (!(quit_if_one_screen && one_screen)) { if (mousecap) deinit_mouse(); if (!no_init) win32_deinit_term(); } #else /* Need clreol to make SETCOLORS take effect. */ clreol(); #endif #endif init_done = 0; } /* * Are we interactive (ie. writing to an initialized tty)? */ public int interactive(void) { return (is_tty && init_done); } static void assert_interactive(void) { if (interactive()) return; /* abort(); */ } /* * Home cursor (move to upper left corner of screen). */ public void home(void) { assert_interactive(); #if !MSDOS_COMPILER ltputs(sc_home, 1, putchr); #else flush(); _settextposition(1,1); #endif } #if LESSTEST public void dump_screen(void) { char dump_cmd[32]; SNPRINTF1(dump_cmd, sizeof(dump_cmd), ESCS"0;0;%dR", sc_width * sc_height); ltputs(dump_cmd, sc_height, putchr); flush(); } #endif /*LESSTEST*/ /* * Add a blank line (called with cursor at home). * Should scroll the display down. */ public void add_line(void) { assert_interactive(); #if !MSDOS_COMPILER ltputs(sc_addline, sc_height, putchr); #else flush(); #if MSDOS_COMPILER==MSOFTC _scrolltextwindow(_GSCROLLDOWN); _settextposition(1,1); #else #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC movetext(1,1, sc_width,sc_height-1, 1,2); gotoxy(1,1); clreol(); #else #if MSDOS_COMPILER==WIN32C { CHAR_INFO fillchar; SMALL_RECT rcSrc, rcClip; COORD new_org; CONSOLE_SCREEN_BUFFER_INFO csbi; GetConsoleScreenBufferInfo(con_out,&csbi); /* The clip rectangle is the entire visible screen. */ rcClip.Left = csbi.srWindow.Left; rcClip.Top = csbi.srWindow.Top; rcClip.Right = csbi.srWindow.Right; rcClip.Bottom = csbi.srWindow.Bottom; /* The source rectangle is the visible screen minus the last line. */ rcSrc = rcClip; rcSrc.Bottom--; /* Move the top left corner of the source window down one row. */ new_org.X = rcSrc.Left; new_org.Y = rcSrc.Top + 1; /* Fill the right character and attributes. */ fillchar.Char.AsciiChar = ' '; curr_attr = MAKEATTR(nm_fg_color, nm_bg_color); fillchar.Attributes = curr_attr; ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar); _settextposition(1,1); } #endif #endif #endif #endif } #if 0 /* * Remove the n topmost lines and scroll everything below it in the * window upward. This is needed to stop leaking the topmost line * into the scrollback buffer when we go down-one-line (in WIN32). */ public void remove_top(int n) { #if MSDOS_COMPILER==WIN32C SMALL_RECT rcSrc, rcClip; CHAR_INFO fillchar; COORD new_org; CONSOLE_SCREEN_BUFFER_INFO csbi; /* to get buffer info */ if (n >= sc_height - 1) { clear(); home(); return; } flush(); GetConsoleScreenBufferInfo(con_out, &csbi); /* Get the extent of all-visible-rows-but-the-last. */ rcSrc.Left = csbi.srWindow.Left; rcSrc.Top = csbi.srWindow.Top + n; rcSrc.Right = csbi.srWindow.Right; rcSrc.Bottom = csbi.srWindow.Bottom; /* Get the clip rectangle. */ rcClip.Left = rcSrc.Left; rcClip.Top = csbi.srWindow.Top; rcClip.Right = rcSrc.Right; rcClip.Bottom = rcSrc.Bottom ; /* Move the source window up n rows. */ new_org.X = rcSrc.Left; new_org.Y = rcSrc.Top - n; /* Fill the right character and attributes. */ fillchar.Char.AsciiChar = ' '; curr_attr = MAKEATTR(nm_fg_color, nm_bg_color); fillchar.Attributes = curr_attr; ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar); /* Position cursor on first blank line. */ goto_line(sc_height - n - 1); #endif } #endif #if MSDOS_COMPILER==WIN32C /* * Clear the screen. */ static void win32_clear(void) { /* * This will clear only the currently visible rows of the NT * console buffer, which means none of the precious scrollback * rows are touched making for faster scrolling. Note that, if * the window has fewer columns than the console buffer (i.e. * there is a horizontal scrollbar as well), the entire width * of the visible rows will be cleared. */ COORD topleft; DWORD nchars; DWORD winsz; CONSOLE_SCREEN_BUFFER_INFO csbi; /* get the number of cells in the current buffer */ GetConsoleScreenBufferInfo(con_out, &csbi); winsz = csbi.dwSize.X * (csbi.srWindow.Bottom - csbi.srWindow.Top + 1); topleft.X = 0; topleft.Y = csbi.srWindow.Top; curr_attr = MAKEATTR(nm_fg_color, nm_bg_color); FillConsoleOutputCharacter(con_out, ' ', winsz, topleft, &nchars); FillConsoleOutputAttribute(con_out, curr_attr, winsz, topleft, &nchars); } /* * Remove the n topmost lines and scroll everything below it in the * window upward. */ public void win32_scroll_up(int n) { SMALL_RECT rcSrc, rcClip; CHAR_INFO fillchar; COORD topleft; COORD new_org; DWORD nchars; DWORD size; CONSOLE_SCREEN_BUFFER_INFO csbi; if (n <= 0) return; if (n >= sc_height - 1) { win32_clear(); _settextposition(1,1); return; } /* Get the extent of what will remain visible after scrolling. */ GetConsoleScreenBufferInfo(con_out, &csbi); rcSrc.Left = csbi.srWindow.Left; rcSrc.Top = csbi.srWindow.Top + n; rcSrc.Right = csbi.srWindow.Right; rcSrc.Bottom = csbi.srWindow.Bottom; /* Get the clip rectangle. */ rcClip.Left = rcSrc.Left; rcClip.Top = csbi.srWindow.Top; rcClip.Right = rcSrc.Right; rcClip.Bottom = rcSrc.Bottom ; /* Move the source text to the top of the screen. */ new_org.X = rcSrc.Left; new_org.Y = rcClip.Top; /* Fill the right character and attributes. */ fillchar.Char.AsciiChar = ' '; fillchar.Attributes = MAKEATTR(nm_fg_color, nm_bg_color); /* Scroll the window. */ SetConsoleTextAttribute(con_out, fillchar.Attributes); ScrollConsoleScreenBuffer(con_out, &rcSrc, &rcClip, new_org, &fillchar); /* Clear remaining lines at bottom. */ topleft.X = csbi.dwCursorPosition.X; topleft.Y = rcSrc.Bottom - n; size = (n * csbi.dwSize.X) + (rcSrc.Right - topleft.X); FillConsoleOutputCharacter(con_out, ' ', size, topleft, &nchars); FillConsoleOutputAttribute(con_out, fillchar.Attributes, size, topleft, &nchars); SetConsoleTextAttribute(con_out, curr_attr); /* Move cursor n lines up from where it was. */ csbi.dwCursorPosition.Y -= n; SetConsoleCursorPosition(con_out, csbi.dwCursorPosition); } #endif /* * Move cursor to lower left corner of screen. */ public void lower_left(void) { assert_interactive(); #if !MSDOS_COMPILER ltputs(sc_lower_left, 1, putchr); #else flush(); _settextposition(sc_height, 1); #endif } /* * Move cursor to left position of current line. */ public void line_left(void) { assert_interactive(); #if !MSDOS_COMPILER ltputs(sc_return, 1, putchr); #else { int row; flush(); #if MSDOS_COMPILER==WIN32C { CONSOLE_SCREEN_BUFFER_INFO scr; GetConsoleScreenBufferInfo(con_out, &scr); row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1; } #else #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC row = wherey(); #else { struct rccoord tpos = _gettextposition(); row = tpos.row; } #endif #endif _settextposition(row, 1); } #endif } /* * Check if the console size has changed and reset internals * (in lieu of SIGWINCH for WIN32). */ public void check_winch(void) { #if MSDOS_COMPILER==WIN32C CONSOLE_SCREEN_BUFFER_INFO scr; COORD size; if (con_out == INVALID_HANDLE_VALUE) return; flush(); GetConsoleScreenBufferInfo(con_out, &scr); size.Y = scr.srWindow.Bottom - scr.srWindow.Top + 1; size.X = scr.srWindow.Right - scr.srWindow.Left + 1; if (size.Y != sc_height || size.X != sc_width) { sc_height = size.Y; sc_width = size.X; if (!no_init && con_out_ours == con_out) SetConsoleScreenBufferSize(con_out, size); pos_init(); wscroll = (sc_height + 1) / 2; screen_trashed = 1; } #endif } /* * Goto a specific line on the screen. */ public void goto_line(int sindex) { assert_interactive(); #if !MSDOS_COMPILER ltputs(tgoto(sc_move, 0, sindex), 1, putchr); #else flush(); _settextposition(sindex+1, 1); #endif } #if MSDOS_COMPILER==MSOFTC || MSDOS_COMPILER==BORLANDC /* * Create an alternate screen which is all white. * This screen is used to create a "flash" effect, by displaying it * briefly and then switching back to the normal screen. * {{ Yuck! There must be a better way to get a visual bell. }} */ static void create_flash(void) { #if MSDOS_COMPILER==MSOFTC struct videoconfig w; char *blanks; int row, col; _getvideoconfig(&w); videopages = w.numvideopages; if (videopages < 2) { at_enter(AT_STANDOUT); at_exit(); } else { _setactivepage(1); at_enter(AT_STANDOUT); blanks = (char *) ecalloc(w.numtextcols, sizeof(char)); for (col = 0; col < w.numtextcols; col++) blanks[col] = ' '; for (row = w.numtextrows; row > 0; row--) _outmem(blanks, w.numtextcols); _setactivepage(0); _setvisualpage(0); free(blanks); at_exit(); } #else #if MSDOS_COMPILER==BORLANDC int n; whitescreen = (unsigned short *) malloc(sc_width * sc_height * sizeof(short)); if (whitescreen == NULL) return; for (n = 0; n < sc_width * sc_height; n++) whitescreen[n] = 0x7020; #endif #endif flash_created = 1; } #endif /* MSDOS_COMPILER */ /* * Output the "visual bell", if there is one. */ public void vbell(void) { if (no_vbell) return; #if !MSDOS_COMPILER if (*sc_visual_bell == '\0') return; ltputs(sc_visual_bell, sc_height, putchr); #else #if MSDOS_COMPILER==DJGPPC ScreenVisualBell(); #else #if MSDOS_COMPILER==MSOFTC /* * Create a flash screen on the second video page. * Switch to that page, then switch back. */ if (!flash_created) create_flash(); if (videopages < 2) return; _setvisualpage(1); delay(100); _setvisualpage(0); #else #if MSDOS_COMPILER==BORLANDC unsigned short *currscreen; /* * Get a copy of the current screen. * Display the flash screen. * Then restore the old screen. */ if (!flash_created) create_flash(); if (whitescreen == NULL) return; currscreen = (unsigned short *) malloc(sc_width * sc_height * sizeof(short)); if (currscreen == NULL) return; gettext(1, 1, sc_width, sc_height, currscreen); puttext(1, 1, sc_width, sc_height, whitescreen); delay(100); puttext(1, 1, sc_width, sc_height, currscreen); free(currscreen); #else #if MSDOS_COMPILER==WIN32C /* paint screen with an inverse color */ clear(); /* leave it displayed for 100 msec. */ Sleep(100); /* restore with a redraw */ repaint(); #endif #endif #endif #endif #endif } /* * Make a noise. */ static void beep(void) { #if !MSDOS_COMPILER putchr(CONTROL('G')); #else #if MSDOS_COMPILER==WIN32C MessageBeep(0); #else write(1, "\7", 1); #endif #endif } /* * Ring the terminal bell. */ public void bell(void) { if (quiet == VERY_QUIET) vbell(); else beep(); } /* * Clear the screen. */ public void clear(void) { assert_interactive(); #if !MSDOS_COMPILER ltputs(sc_clear, sc_height, putchr); #else flush(); #if MSDOS_COMPILER==WIN32C win32_clear(); #else _clearscreen(_GCLEARSCREEN); #endif #endif } /* * Clear from the cursor to the end of the cursor's line. * {{ This must not move the cursor. }} */ public void clear_eol(void) { /* assert_interactive();*/ #if !MSDOS_COMPILER ltputs(sc_eol_clear, 1, putchr); #else #if MSDOS_COMPILER==MSOFTC short top, left; short bot, right; struct rccoord tpos; flush(); /* * Save current state. */ tpos = _gettextposition(); _gettextwindow(&top, &left, &bot, &right); /* * Set a temporary window to the current line, * from the cursor's position to the right edge of the screen. * Then clear that window. */ _settextwindow(tpos.row, tpos.col, tpos.row, sc_width); _clearscreen(_GWINDOW); /* * Restore state. */ _settextwindow(top, left, bot, right); _settextposition(tpos.row, tpos.col); #else #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC flush(); clreol(); #else #if MSDOS_COMPILER==WIN32C DWORD nchars; COORD cpos; CONSOLE_SCREEN_BUFFER_INFO scr; flush(); memset(&scr, 0, sizeof(scr)); GetConsoleScreenBufferInfo(con_out, &scr); cpos.X = scr.dwCursorPosition.X; cpos.Y = scr.dwCursorPosition.Y; curr_attr = MAKEATTR(nm_fg_color, nm_bg_color); FillConsoleOutputAttribute(con_out, curr_attr, scr.dwSize.X - cpos.X, cpos, &nchars); FillConsoleOutputCharacter(con_out, ' ', scr.dwSize.X - cpos.X, cpos, &nchars); #endif #endif #endif #endif } /* * Clear the current line. * Clear the screen if there's off-screen memory below the display. */ static void clear_eol_bot(void) { assert_interactive(); #if MSDOS_COMPILER clear_eol(); #else if (below_mem) ltputs(sc_eos_clear, 1, putchr); else ltputs(sc_eol_clear, 1, putchr); #endif } /* * Clear the bottom line of the display. * Leave the cursor at the beginning of the bottom line. */ public void clear_bot(void) { /* * If we're in a non-normal attribute mode, temporarily exit * the mode while we do the clear. Some terminals fill the * cleared area with the current attribute. */ if (oldbot) lower_left(); else line_left(); if (attrmode == AT_NORMAL) clear_eol_bot(); else { int saved_attrmode = attrmode; at_exit(); clear_eol_bot(); at_enter(saved_attrmode); } } /* * Color string may be "x[y]" where x and y are 4-bit color chars, * or "N[.M]" where N and M are decimal integers> * Any of x,y,N,M may also be "-" to mean "unchanged". */ /* * Parse a 4-bit color char. */ static int parse_color4(char ch) { switch (ch) { case 'k': return 0; case 'r': return CV_RED; case 'g': return CV_GREEN; case 'y': return CV_RED|CV_GREEN; case 'b': return CV_BLUE; case 'm': return CV_RED|CV_BLUE; case 'c': return CV_GREEN|CV_BLUE; case 'w': return CV_RED|CV_GREEN|CV_BLUE; case 'K': return 0|CV_BRIGHT; case 'R': return CV_RED|CV_BRIGHT; case 'G': return CV_GREEN|CV_BRIGHT; case 'Y': return CV_RED|CV_GREEN|CV_BRIGHT; case 'B': return CV_BLUE|CV_BRIGHT; case 'M': return CV_RED|CV_BLUE|CV_BRIGHT; case 'C': return CV_GREEN|CV_BLUE|CV_BRIGHT; case 'W': return CV_RED|CV_GREEN|CV_BLUE|CV_BRIGHT; case '-': return CV_NOCHANGE; default: return CV_ERROR; } } /* * Parse a color as a decimal integer. */ static int parse_color6(char **ps) { if (**ps == '-') { (*ps)++; return CV_NOCHANGE; } else { char *ops = *ps; int color = lstrtoi(ops, ps, 10); if (color < 0 || *ps == ops) return CV_ERROR; return color; } } /* * Parse a color pair and return the foreground/background values. * Return type of color specifier: * CV_4BIT: fg/bg values are OR of CV_{RGB} bits. * CV_6BIT: fg/bg values are integers entered by user. */ public COLOR_TYPE parse_color(char *str, int *p_fg, int *p_bg) { int fg; int bg; COLOR_TYPE type = CT_NULL; if (str == NULL || *str == '\0') return CT_NULL; if (*str == '+') str++; /* ignore leading + */ fg = parse_color4(str[0]); bg = parse_color4((strlen(str) < 2) ? '-' : str[1]); if (fg != CV_ERROR && bg != CV_ERROR) type = CT_4BIT; else { fg = parse_color6(&str); bg = (fg != CV_ERROR && *str++ == '.') ? parse_color6(&str) : CV_NOCHANGE; if (fg != CV_ERROR && bg != CV_ERROR) type = CT_6BIT; } if (p_fg != NULL) *p_fg = fg; if (p_bg != NULL) *p_bg = bg; return type; } #if !MSDOS_COMPILER static int sgr_color(int color) { switch (color) { case 0: return 30; case CV_RED: return 31; case CV_GREEN: return 32; case CV_RED|CV_GREEN: return 33; case CV_BLUE: return 34; case CV_RED|CV_BLUE: return 35; case CV_GREEN|CV_BLUE: return 36; case CV_RED|CV_GREEN|CV_BLUE: return 37; case CV_BRIGHT: return 90; case CV_RED|CV_BRIGHT: return 91; case CV_GREEN|CV_BRIGHT: return 92; case CV_RED|CV_GREEN|CV_BRIGHT: return 93; case CV_BLUE|CV_BRIGHT: return 94; case CV_RED|CV_BLUE|CV_BRIGHT: return 95; case CV_GREEN|CV_BLUE|CV_BRIGHT: return 96; case CV_RED|CV_GREEN|CV_BLUE|CV_BRIGHT: return 97; default: return color; } } static void tput_fmt(char *fmt, int color, int (*f_putc)(int)) { char buf[INT_STRLEN_BOUND(int)+16]; if (color == attrcolor) return; SNPRINTF1(buf, sizeof(buf), fmt, color); ltputs(buf, 1, f_putc); attrcolor = color; } static void tput_color(char *str, int (*f_putc)(int)) { int fg; int bg; if (str != NULL && strcmp(str, "*") == 0) { /* Special case: reset to normal */ tput_fmt(ESCS"[m", -1, f_putc); return; } switch (parse_color(str, &fg, &bg)) { case CT_4BIT: if (fg >= 0) tput_fmt(ESCS"[%dm", sgr_color(fg), f_putc); if (bg >= 0) tput_fmt(ESCS"[%dm", sgr_color(bg)+10, f_putc); break; case CT_6BIT: if (fg >= 0) tput_fmt(ESCS"[38;5;%dm", fg, f_putc); if (bg >= 0) tput_fmt(ESCS"[48;5;%dm", bg, f_putc); break; default: break; } } static void tput_inmode(char *mode_str, int attr, int attr_bit, int (*f_putc)(int)) { char *color_str; if ((attr & attr_bit) == 0) return; color_str = get_color_map(attr_bit); if (color_str == NULL || *color_str == '\0' || *color_str == '+') { ltputs(mode_str, 1, f_putc); if (color_str == NULL || *color_str++ != '+') return; } /* Color overrides mode string */ tput_color(color_str, f_putc); } static void tput_outmode(char *mode_str, int attr_bit, int (*f_putc)(int)) { if ((attrmode & attr_bit) == 0) return; ltputs(mode_str, 1, f_putc); } #else /* MSDOS_COMPILER */ #if MSDOS_COMPILER==WIN32C static int WIN32put_fmt(char *fmt, int color) { char buf[INT_STRLEN_BOUND(int)+16]; int len = SNPRINTF1(buf, sizeof(buf), fmt, color); WIN32textout(buf, len); return TRUE; } #endif static int win_set_color(int attr) { int fg; int bg; int out = FALSE; char *str = get_color_map(attr); if (str == NULL || str[0] == '\0') return FALSE; switch (parse_color(str, &fg, &bg)) { case CT_4BIT: if (fg >= 0 && bg >= 0) { SETCOLORS(fg, bg); out = TRUE; } else if (fg >= 0) { SET_FG_COLOR(fg); out = TRUE; } else if (bg >= 0) { SET_BG_COLOR(bg); out = TRUE; } break; #if MSDOS_COMPILER==WIN32C case CT_6BIT: if (vt_enabled) { if (fg > 0) out = WIN32put_fmt(ESCS"[38;5;%dm", fg); if (bg > 0) out = WIN32put_fmt(ESCS"[48;5;%dm", bg); } break; #endif default: break; } return out; } #endif /* MSDOS_COMPILER */ public void at_enter(int attr) { attr = apply_at_specials(attr); #if !MSDOS_COMPILER /* The one with the most priority is last. */ tput_inmode(sc_u_in, attr, AT_UNDERLINE, putchr); tput_inmode(sc_b_in, attr, AT_BOLD, putchr); tput_inmode(sc_bl_in, attr, AT_BLINK, putchr); /* Don't use standout and color at the same time. */ if (use_color && (attr & AT_COLOR)) tput_color(get_color_map(attr), putchr); else tput_inmode(sc_s_in, attr, AT_STANDOUT, putchr); #else flush(); /* The one with the most priority is first. */ if ((attr & AT_COLOR) && use_color) { win_set_color(attr); } else if (attr & AT_STANDOUT) { SETCOLORS(so_fg_color, so_bg_color); } else if (attr & AT_BLINK) { SETCOLORS(bl_fg_color, bl_bg_color); } else if (attr & AT_BOLD) { SETCOLORS(bo_fg_color, bo_bg_color); } else if (attr & AT_UNDERLINE) { SETCOLORS(ul_fg_color, ul_bg_color); } #endif attrmode = attr; } public void at_exit(void) { #if !MSDOS_COMPILER /* Undo things in the reverse order we did them. */ tput_color("*", putchr); tput_outmode(sc_s_out, AT_STANDOUT, putchr); tput_outmode(sc_bl_out, AT_BLINK, putchr); tput_outmode(sc_b_out, AT_BOLD, putchr); tput_outmode(sc_u_out, AT_UNDERLINE, putchr); #else flush(); SETCOLORS(nm_fg_color, nm_bg_color); #endif attrmode = AT_NORMAL; } public void at_switch(int attr) { int new_attrmode = apply_at_specials(attr); int ignore_modes = AT_ANSI; if ((new_attrmode & ~ignore_modes) != (attrmode & ~ignore_modes)) { at_exit(); at_enter(attr); } } public int is_at_equiv(int attr1, int attr2) { attr1 = apply_at_specials(attr1); attr2 = apply_at_specials(attr2); return (attr1 == attr2); } public int apply_at_specials(int attr) { if (attr & AT_BINARY) attr |= binattr; if (attr & AT_HILITE) attr |= AT_STANDOUT; attr &= ~(AT_BINARY|AT_HILITE); return attr; } /* * Output a plain backspace, without erasing the previous char. */ public void putbs(void) { if (termcap_debug) putstr(""); else { #if !MSDOS_COMPILER ltputs(sc_backspace, 1, putchr); #else int row, col; flush(); { #if MSDOS_COMPILER==MSOFTC struct rccoord tpos; tpos = _gettextposition(); row = tpos.row; col = tpos.col; #else #if MSDOS_COMPILER==BORLANDC || MSDOS_COMPILER==DJGPPC row = wherey(); col = wherex(); #else #if MSDOS_COMPILER==WIN32C CONSOLE_SCREEN_BUFFER_INFO scr; GetConsoleScreenBufferInfo(con_out, &scr); row = scr.dwCursorPosition.Y - scr.srWindow.Top + 1; col = scr.dwCursorPosition.X - scr.srWindow.Left + 1; #endif #endif #endif } if (col <= 1) return; _settextposition(row, col-1); #endif /* MSDOS_COMPILER */ } } #if MSDOS_COMPILER==WIN32C /* * Determine whether an input character is waiting to be read. */ public int win32_kbhit(void) { INPUT_RECORD ip; DWORD read; - if (keyCount > 0) + if (keyCount > 0 || win_unget_pending) return (TRUE); currentKey.ascii = 0; currentKey.scan = 0; if (x11mouseCount > 0) { currentKey.ascii = x11mousebuf[x11mousePos++]; --x11mouseCount; keyCount = 1; return (TRUE); } /* * Wait for a real key-down event, but * ignore SHIFT and CONTROL key events. */ do { PeekConsoleInputW(tty, &ip, 1, &read); if (read == 0) return (FALSE); ReadConsoleInputW(tty, &ip, 1, &read); /* generate an X11 mouse sequence from the mouse event */ if (mousecap && ip.EventType == MOUSE_EVENT && ip.Event.MouseEvent.dwEventFlags != MOUSE_MOVED) { x11mousebuf[3] = X11MOUSE_OFFSET + ip.Event.MouseEvent.dwMousePosition.X + 1; x11mousebuf[4] = X11MOUSE_OFFSET + ip.Event.MouseEvent.dwMousePosition.Y + 1; switch (ip.Event.MouseEvent.dwEventFlags) { case 0: /* press or release */ if (ip.Event.MouseEvent.dwButtonState == 0) x11mousebuf[2] = X11MOUSE_OFFSET + X11MOUSE_BUTTON_REL; else if (ip.Event.MouseEvent.dwButtonState & (FROM_LEFT_3RD_BUTTON_PRESSED | FROM_LEFT_4TH_BUTTON_PRESSED)) continue; else x11mousebuf[2] = X11MOUSE_OFFSET + X11MOUSE_BUTTON1 + ((int)ip.Event.MouseEvent.dwButtonState << 1); break; case MOUSE_WHEELED: x11mousebuf[2] = X11MOUSE_OFFSET + (((int)ip.Event.MouseEvent.dwButtonState < 0) ? X11MOUSE_WHEEL_DOWN : X11MOUSE_WHEEL_UP); break; default: continue; } x11mousePos = 0; x11mouseCount = 5; currentKey.ascii = ESC; keyCount = 1; return (TRUE); } } while (ip.EventType != KEY_EVENT || ip.Event.KeyEvent.bKeyDown != TRUE || (ip.Event.KeyEvent.wVirtualScanCode == 0 && ip.Event.KeyEvent.uChar.UnicodeChar == 0) || ((ip.Event.KeyEvent.dwControlKeyState & (RIGHT_ALT_PRESSED|LEFT_CTRL_PRESSED)) == (RIGHT_ALT_PRESSED|LEFT_CTRL_PRESSED) && ip.Event.KeyEvent.uChar.UnicodeChar == 0) || ip.Event.KeyEvent.wVirtualKeyCode == VK_KANJI || ip.Event.KeyEvent.wVirtualKeyCode == VK_SHIFT || ip.Event.KeyEvent.wVirtualKeyCode == VK_CONTROL || ip.Event.KeyEvent.wVirtualKeyCode == VK_MENU); currentKey.unicode = ip.Event.KeyEvent.uChar.UnicodeChar; currentKey.ascii = ip.Event.KeyEvent.uChar.AsciiChar; currentKey.scan = ip.Event.KeyEvent.wVirtualScanCode; keyCount = ip.Event.KeyEvent.wRepeatCount; if (ip.Event.KeyEvent.dwControlKeyState & (LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED)) { switch (currentKey.scan) { case PCK_ALT_E: /* letter 'E' */ currentKey.ascii = 0; break; } } else if (ip.Event.KeyEvent.dwControlKeyState & (LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED)) { switch (currentKey.scan) { case PCK_RIGHT: /* right arrow */ currentKey.scan = PCK_CTL_RIGHT; break; case PCK_LEFT: /* left arrow */ currentKey.scan = PCK_CTL_LEFT; break; case PCK_DELETE: /* delete */ currentKey.scan = PCK_CTL_DELETE; break; } } else if (ip.Event.KeyEvent.dwControlKeyState & SHIFT_PRESSED) { switch (currentKey.scan) { case PCK_SHIFT_TAB: /* tab */ currentKey.ascii = 0; break; } } return (TRUE); } /* * Read a character from the keyboard. + * + * Known issues: + * - WIN32getch API should be int like libc (with unsigned char values or -1). + * - The unicode code below can return 0 - incorrectly indicating scan code. + * - UTF16-LE surrogate pairs don't work (and return 0). + * - If win32_kbhit returns true then WIN32getch should never block, but it + * will block till the next keypress if it's numlock/capslock scan code. */ public char WIN32getch(void) { char ascii; static unsigned char utf8[UTF8_MAX_LENGTH]; static int utf8_size = 0; static int utf8_next_byte = 0; + if (win_unget_pending) + { + win_unget_pending = FALSE; + return (char) win_unget_data; + } + // Return the rest of multibyte character from the prior call if (utf8_next_byte < utf8_size) { ascii = utf8[utf8_next_byte++]; return ascii; } utf8_size = 0; if (pending_scancode) { pending_scancode = 0; return ((char)(currentKey.scan & 0x00FF)); } do { - while (win32_kbhit() == FALSE) + while (!win32_kbhit()) { Sleep(20); if (ABORT_SIGS()) return ('\003'); - continue; } - keyCount --; + keyCount--; // If multibyte character, return its first byte - if (currentKey.ascii != currentKey.unicode) + if (currentKey.unicode > 0x7f) { - utf8_size = WideCharToMultiByte(CP_UTF8, 0, ¤tKey.unicode, 1, &utf8, sizeof(utf8), NULL, NULL); - if (utf8_size == 0 ) + utf8_size = WideCharToMultiByte(CP_UTF8, 0, ¤tKey.unicode, 1, (LPSTR) &utf8, sizeof(utf8), NULL, NULL); + if (utf8_size == 0) return '\0'; ascii = utf8[0]; utf8_next_byte = 1; } else ascii = currentKey.ascii; /* * On PC's, the extended keys return a 2 byte sequence beginning * with '00', so if the ascii code is 00, the next byte will be * the lsb of the scan code. */ pending_scancode = (ascii == 0x00); } while (pending_scancode && (currentKey.scan == PCK_CAPS_LOCK || currentKey.scan == PCK_NUM_LOCK)); return ascii; } + +/* + * Make the next call to WIN32getch return ch without changing the queue state. + */ +public void WIN32ungetch(int ch) +{ + win_unget_pending = TRUE; + win_unget_data = ch; +} #endif #if MSDOS_COMPILER /* */ public void WIN32setcolors(int fg, int bg) { SETCOLORS(fg, bg); } /* */ public void WIN32textout(char *text, int len) { #if MSDOS_COMPILER==WIN32C DWORD written; if (utf_mode == 2) { /* * We've got UTF-8 text in a non-UTF-8 console. Convert it to * wide and use WriteConsoleW. */ WCHAR wtext[1024]; len = MultiByteToWideChar(CP_UTF8, 0, text, len, wtext, sizeof(wtext)/sizeof(*wtext)); WriteConsoleW(con_out, wtext, len, &written, NULL); } else WriteConsole(con_out, text, len, &written, NULL); #else char c = text[len]; text[len] = '\0'; cputs(text); text[len] = c; #endif } #endif diff --git a/contrib/less/search.c b/contrib/less/search.c index 758e4491f1ce..98f01e5fcedd 100644 --- a/contrib/less/search.c +++ b/contrib/less/search.c @@ -1,1866 +1,1868 @@ /* * Copyright (C) 1984-2023 Mark Nudelman * * You may distribute under the terms of either the GNU General Public * License or the Less License, as specified in the README file. * * For more information, see the README file. */ /* * Routines to search a file for a pattern. */ #include "less.h" #include "position.h" #include "charset.h" #define MINPOS(a,b) (((a) < (b)) ? (a) : (b)) #define MAXPOS(a,b) (((a) > (b)) ? (a) : (b)) extern int sigs; extern int how_search; extern int caseless; extern int linenums; extern int sc_height; extern int jump_sline; extern int bs_mode; extern int proc_backspace; extern int proc_return; extern int ctldisp; extern int status_col; extern void *ml_search; extern POSITION start_attnpos; extern POSITION end_attnpos; extern int utf_mode; extern int screen_trashed; extern int sc_width; extern int sc_height; extern int hshift; extern int nosearch_headers; extern int header_lines; extern int header_cols; #if HILITE_SEARCH extern int hilite_search; extern int size_linebuf; extern int squished; extern int can_goto_line; static int hide_hilite; static POSITION prep_startpos; static POSITION prep_endpos; extern POSITION xxpos; /* * Structures for maintaining a set of ranges for hilites and filtered-out * lines. Each range is stored as a node within a red-black tree, and we * try to extend existing ranges (without creating overlaps) rather than * create new nodes if possible. We remember the last node found by a * search for constant-time lookup if the next search is near enough to * the previous. To aid that, we overlay a secondary doubly-linked list * on top of the red-black tree so we can find the preceding/succeeding * nodes also in constant time. * * Each node is allocated from a series of pools, each pool double the size * of the previous (for amortised constant time allocation). Since our only * tree operations are clear and node insertion, not node removal, we don't * need to maintain a usage bitmap or freelist and can just return nodes * from the pool in-order until capacity is reached. */ struct hilite { POSITION hl_startpos; POSITION hl_endpos; int hl_attr; }; struct hilite_node { struct hilite_node *parent; struct hilite_node *left; struct hilite_node *right; struct hilite_node *prev; struct hilite_node *next; int red; struct hilite r; }; struct hilite_storage { int capacity; int used; struct hilite_storage *next; struct hilite_node *nodes; }; struct hilite_tree { struct hilite_storage *first; struct hilite_storage *current; struct hilite_node *root; struct hilite_node *lookaside; }; #define HILITE_INITIALIZER() { NULL, NULL, NULL, NULL } #define HILITE_LOOKASIDE_STEPS 2 static struct hilite_tree hilite_anchor = HILITE_INITIALIZER(); static struct hilite_tree filter_anchor = HILITE_INITIALIZER(); static struct pattern_info *filter_infos = NULL; #endif /* * These are the static variables that represent the "remembered" * search pattern and filter pattern. */ struct pattern_info { PATTERN_TYPE compiled; char* text; int search_type; int is_ucase_pattern; struct pattern_info *next; }; #if NO_REGEX #define info_compiled(info) ((void*)0) #else #define info_compiled(info) ((info)->compiled) #endif static struct pattern_info search_info; public int is_caseless; /* * Are there any uppercase letters in this string? */ static int is_ucase(char *str) { char *str_end = str + strlen(str); LWCHAR ch; while (str < str_end) { ch = step_char(&str, +1, str_end); if (IS_UPPER(ch)) return (1); } return (0); } /* * Discard a saved pattern. */ static void clear_pattern(struct pattern_info *info) { if (info->text != NULL) free(info->text); info->text = NULL; #if !NO_REGEX uncompile_pattern(&info->compiled); #endif } /* * Compile and save a search pattern. */ static int set_pattern(struct pattern_info *info, char *pattern, int search_type, int show_error) { /* * Ignore case if -I is set OR * -i is set AND the pattern is all lowercase. */ info->is_ucase_pattern = (pattern == NULL) ? FALSE : is_ucase(pattern); is_caseless = (info->is_ucase_pattern && caseless != OPT_ONPLUS) ? 0 : caseless; #if !NO_REGEX if (pattern == NULL) SET_NULL_PATTERN(info->compiled); else if (compile_pattern(pattern, search_type, show_error, &info->compiled) < 0) return -1; #endif /* Pattern compiled successfully; save the text too. */ if (info->text != NULL) free(info->text); info->text = NULL; if (pattern != NULL) { info->text = (char *) ecalloc(1, strlen(pattern)+1); strcpy(info->text, pattern); } info->search_type = search_type; return 0; } /* * Initialize saved pattern to nothing. */ static void init_pattern(struct pattern_info *info) { SET_NULL_PATTERN(info->compiled); info->text = NULL; info->search_type = 0; info->next = NULL; } /* * Initialize search variables. */ public void init_search(void) { init_pattern(&search_info); } /* * Determine which text conversions to perform before pattern matching. */ static int get_cvt_ops(int search_type) { int ops = 0; if (is_caseless && (!re_handles_caseless || (search_type & SRCH_NO_REGEX))) ops |= CVT_TO_LC; if (proc_backspace == OPT_ON || (bs_mode == BS_SPECIAL && proc_backspace == OPT_OFF)) ops |= CVT_BS; if (proc_return == OPT_ON || (bs_mode != BS_CONTROL && proc_backspace == OPT_OFF)) ops |= CVT_CRLF; if (ctldisp == OPT_ONPLUS) ops |= CVT_ANSI; return (ops); } /* * Is there a previous (remembered) search pattern? */ static int prev_pattern(struct pattern_info *info) { #if !NO_REGEX if ((info->search_type & SRCH_NO_REGEX) == 0) return (!is_null_pattern(info->compiled)); #endif return (info->text != NULL); } #if HILITE_SEARCH /* * Repaint the hilites currently displayed on the screen. * Repaint each line which contains highlighted text. * If on==0, force all hilites off. */ public void repaint_hilite(int on) { int sindex; POSITION pos; int save_hide_hilite; if (squished) repaint(); save_hide_hilite = hide_hilite; if (!on) { if (hide_hilite) return; hide_hilite = 1; } if (!can_goto_line) { repaint(); hide_hilite = save_hide_hilite; return; } for (sindex = TOP; sindex < TOP + sc_height-1; sindex++) { pos = position(sindex); if (pos == NULL_POSITION) continue; (void) forw_line(pos); goto_line(sindex); clear_eol(); put_line(); } overlay_header(); lower_left(); hide_hilite = save_hide_hilite; } #endif /* * Clear the attn hilite. */ public void clear_attn(void) { #if HILITE_SEARCH int sindex; POSITION old_start_attnpos; POSITION old_end_attnpos; POSITION pos; POSITION epos; int moved = 0; if (start_attnpos == NULL_POSITION) return; old_start_attnpos = start_attnpos; old_end_attnpos = end_attnpos; start_attnpos = end_attnpos = NULL_POSITION; if (!can_goto_line) { repaint(); return; } if (squished) repaint(); for (sindex = TOP; sindex < TOP + sc_height-1; sindex++) { pos = position(sindex); if (pos == NULL_POSITION) continue; epos = position(sindex+1); if (pos <= old_end_attnpos && (epos == NULL_POSITION || epos > old_start_attnpos)) { (void) forw_line(pos); goto_line(sindex); clear_eol(); put_line(); moved = 1; } } if (overlay_header()) moved = 1; if (moved) lower_left(); #endif } /* * Toggle or clear search string highlighting. */ public void undo_search(int clear) { clear_pattern(&search_info); #if HILITE_SEARCH if (clear) { clr_hilite(); } else { if (hilite_anchor.first == NULL) { error("No previous regular expression", NULL_PARG); return; } hide_hilite = !hide_hilite; } repaint_hilite(1); #endif } #if HILITE_SEARCH /* * Clear the hilite list. */ public void clr_hlist(struct hilite_tree *anchor) { struct hilite_storage *hls; struct hilite_storage *nexthls; for (hls = anchor->first; hls != NULL; hls = nexthls) { nexthls = hls->next; free((void*)hls->nodes); free((void*)hls); } anchor->first = NULL; anchor->current = NULL; anchor->root = NULL; anchor->lookaside = NULL; prep_startpos = prep_endpos = NULL_POSITION; } public void clr_hilite(void) { clr_hlist(&hilite_anchor); } public void clr_filter(void) { clr_hlist(&filter_anchor); } /* * Find the node covering pos, or the node after it if no node covers it, * or return NULL if pos is after the last range. Remember the found node, * to speed up subsequent searches for the same or similar positions (if * we return NULL, remember the last node.) */ static struct hilite_node* hlist_find(struct hilite_tree *anchor, POSITION pos) { struct hilite_node *n, *m; if (anchor->lookaside) { int steps = 0; int hit = 0; n = anchor->lookaside; for (;;) { if (pos < n->r.hl_endpos) { if (n->prev == NULL || pos >= n->prev->r.hl_endpos) { hit = 1; break; } } else if (n->next == NULL) { n = NULL; hit = 1; break; } /* * If we don't find the right node within a small * distance, don't keep doing a linear search! */ if (steps >= HILITE_LOOKASIDE_STEPS) break; steps++; if (pos < n->r.hl_endpos) anchor->lookaside = n = n->prev; else anchor->lookaside = n = n->next; } if (hit) return n; } n = anchor->root; m = NULL; while (n != NULL) { if (pos < n->r.hl_startpos) { if (n->left != NULL) { m = n; n = n->left; continue; } break; } if (pos >= n->r.hl_endpos) { if (n->right != NULL) { n = n->right; continue; } if (m != NULL) { n = m; } else { m = n; n = NULL; } } break; } if (n != NULL) anchor->lookaside = n; else if (m != NULL) anchor->lookaside = m; return n; } /* * Should any characters in a specified range be highlighted? */ static int hilited_range_attr(POSITION pos, POSITION epos) { struct hilite_node *n = hlist_find(&hilite_anchor, pos); if (n == NULL) return 0; if (epos != NULL_POSITION && epos <= n->r.hl_startpos) return 0; return n->r.hl_attr; } /* * Is a line "filtered" -- that is, should it be hidden? */ public int is_filtered(POSITION pos) { struct hilite_node *n; if (ch_getflags() & CH_HELPFILE) return (0); n = hlist_find(&filter_anchor, pos); return (n != NULL && pos >= n->r.hl_startpos); } /* * If pos is hidden, return the next position which isn't, otherwise * just return pos. */ public POSITION next_unfiltered(POSITION pos) { struct hilite_node *n; if (ch_getflags() & CH_HELPFILE) return (pos); n = hlist_find(&filter_anchor, pos); while (n != NULL && pos >= n->r.hl_startpos) { pos = n->r.hl_endpos; n = n->next; } return (pos); } /* * If pos is hidden, return the previous position which isn't or 0 if * we're filtered right to the beginning, otherwise just return pos. */ public POSITION prev_unfiltered(POSITION pos) { struct hilite_node *n; if (ch_getflags() & CH_HELPFILE) return (pos); n = hlist_find(&filter_anchor, pos); while (n != NULL && pos >= n->r.hl_startpos) { pos = n->r.hl_startpos; if (pos == 0) break; pos--; n = n->prev; } return (pos); } /* * Should any characters in a specified range be highlighted? * If nohide is nonzero, don't consider hide_hilite. */ public int is_hilited_attr(POSITION pos, POSITION epos, int nohide, int *p_matches) { int attr; if (p_matches != NULL) *p_matches = 0; if (!status_col && start_attnpos != NULL_POSITION && pos <= end_attnpos && (epos == NULL_POSITION || epos >= start_attnpos)) /* * The attn line overlaps this range. */ return (AT_HILITE|AT_COLOR_ATTN); attr = hilited_range_attr(pos, epos); if (attr == 0) return (0); if (p_matches == NULL) /* * Kinda kludgy way to recognize that caller is checking for * hilite in status column. In this case we want to return * hilite status even if hiliting is disabled or hidden. */ return (attr); /* * Report matches, even if we're hiding highlights. */ *p_matches = 1; if (hilite_search == 0) /* * Not doing highlighting. */ return (0); if (!nohide && hide_hilite) /* * Highlighting is hidden. */ return (0); return (attr); } /* * Tree node storage: get the current block of nodes if it has spare * capacity, or create a new one if not. */ static struct hilite_storage * hlist_getstorage(struct hilite_tree *anchor) { int capacity = 1; struct hilite_storage *s; if (anchor->current) { if (anchor->current->used < anchor->current->capacity) return anchor->current; capacity = anchor->current->capacity * 2; } s = (struct hilite_storage *) ecalloc(1, sizeof(struct hilite_storage)); s->nodes = (struct hilite_node *) ecalloc(capacity, sizeof(struct hilite_node)); s->capacity = capacity; s->used = 0; s->next = NULL; if (anchor->current) anchor->current->next = s; else anchor->first = s; anchor->current = s; return s; } /* * Tree node storage: retrieve a new empty node to be inserted into the * tree. */ static struct hilite_node * hlist_getnode(struct hilite_tree *anchor) { struct hilite_storage *s = hlist_getstorage(anchor); return &s->nodes[s->used++]; } /* * Rotate the tree left around a pivot node. */ static void hlist_rotate_left(struct hilite_tree *anchor, struct hilite_node *n) { struct hilite_node *np = n->parent; struct hilite_node *nr = n->right; struct hilite_node *nrl = n->right->left; if (np != NULL) { if (n == np->left) np->left = nr; else np->right = nr; } else { anchor->root = nr; } nr->left = n; n->right = nrl; nr->parent = np; n->parent = nr; if (nrl != NULL) nrl->parent = n; } /* * Rotate the tree right around a pivot node. */ static void hlist_rotate_right(struct hilite_tree *anchor, struct hilite_node *n) { struct hilite_node *np = n->parent; struct hilite_node *nl = n->left; struct hilite_node *nlr = n->left->right; if (np != NULL) { if (n == np->right) np->right = nl; else np->left = nl; } else { anchor->root = nl; } nl->right = n; n->left = nlr; nl->parent = np; n->parent = nl; if (nlr != NULL) nlr->parent = n; } /* * Add a new hilite to a hilite list. */ static void add_hilite(struct hilite_tree *anchor, struct hilite *hl) { struct hilite_node *p, *n, *u; /* Ignore empty ranges. */ if (hl->hl_startpos >= hl->hl_endpos) return; p = anchor->root; /* Inserting the very first node is trivial. */ if (p == NULL) { n = hlist_getnode(anchor); n->r = *hl; anchor->root = n; anchor->lookaside = n; return; } /* * Find our insertion point. If we come across any overlapping * or adjoining existing ranges, shrink our range and discard * if it become empty. */ for (;;) { if (hl->hl_startpos < p->r.hl_startpos) { if (hl->hl_endpos > p->r.hl_startpos && hl->hl_attr == p->r.hl_attr) hl->hl_endpos = p->r.hl_startpos; if (p->left != NULL) { p = p->left; continue; } break; } if (hl->hl_startpos < p->r.hl_endpos && hl->hl_attr == p->r.hl_attr) { hl->hl_startpos = p->r.hl_endpos; if (hl->hl_startpos >= hl->hl_endpos) return; } if (p->right != NULL) { p = p->right; continue; } break; } /* * Now we're at the right leaf, again check for contiguous ranges * and extend the existing node if possible to avoid the * insertion. Otherwise insert a new node at the leaf. */ if (hl->hl_startpos < p->r.hl_startpos) { if (hl->hl_attr == p->r.hl_attr) { if (hl->hl_endpos == p->r.hl_startpos) { p->r.hl_startpos = hl->hl_startpos; return; } if (p->prev != NULL && p->prev->r.hl_endpos == hl->hl_startpos) { p->prev->r.hl_endpos = hl->hl_endpos; return; } } p->left = n = hlist_getnode(anchor); n->next = p; if (p->prev != NULL) { n->prev = p->prev; p->prev->next = n; } p->prev = n; } else { if (hl->hl_attr == p->r.hl_attr) { if (p->r.hl_endpos == hl->hl_startpos) { p->r.hl_endpos = hl->hl_endpos; return; } if (p->next != NULL && hl->hl_endpos == p->next->r.hl_startpos) { p->next->r.hl_startpos = hl->hl_startpos; return; } } p->right = n = hlist_getnode(anchor); n->prev = p; if (p->next != NULL) { n->next = p->next; p->next->prev = n; } p->next = n; } n->parent = p; n->red = 1; n->r = *hl; /* * The tree is in the correct order and covers the right ranges * now, but may have become unbalanced. Rebalance it using the * standard red-black tree constraints and operations. */ for (;;) { /* case 1 - current is root, root is always black */ if (n->parent == NULL) { n->red = 0; break; } /* case 2 - parent is black, we can always be red */ if (!n->parent->red) break; /* * constraint: because the root must be black, if our * parent is red it cannot be the root therefore we must * have a grandparent */ /* * case 3 - parent and uncle are red, repaint them black, * the grandparent red, and start again at the grandparent. */ u = n->parent->parent->left; if (n->parent == u) u = n->parent->parent->right; if (u != NULL && u->red) { n->parent->red = 0; u->red = 0; n = n->parent->parent; n->red = 1; continue; } /* * case 4 - parent is red but uncle is black, parent and * grandparent on opposite sides. We need to start * changing the structure now. This and case 5 will shorten * our branch and lengthen the sibling, between them * restoring balance. */ if (n == n->parent->right && n->parent == n->parent->parent->left) { hlist_rotate_left(anchor, n->parent); n = n->left; } else if (n == n->parent->left && n->parent == n->parent->parent->right) { hlist_rotate_right(anchor, n->parent); n = n->right; } /* * case 5 - parent is red but uncle is black, parent and * grandparent on same side */ n->parent->red = 0; n->parent->parent->red = 1; if (n == n->parent->left) hlist_rotate_right(anchor, n->parent->parent); else hlist_rotate_left(anchor, n->parent->parent); break; } } /* * Highlight every character in a range of displayed characters. */ static void create_hilites(POSITION linepos, char *line, char *sp, char *ep, int attr, int *chpos) { int start_index = sp - line; int end_index = ep - line; struct hilite hl; int i; /* Start the first hilite. */ hl.hl_startpos = linepos + chpos[start_index]; hl.hl_attr = attr; /* * Step through the displayed chars. * If the source position (before cvt) of the char is one more * than the source pos of the previous char (the usual case), * just increase the size of the current hilite by one. * Otherwise (there are backspaces or something involved), * finish the current hilite and start a new one. */ for (i = start_index+1; i <= end_index; i++) { if (chpos[i] != chpos[i-1] + 1 || i == end_index) { hl.hl_endpos = linepos + chpos[i-1] + 1; add_hilite(&hilite_anchor, &hl); /* Start new hilite unless this is the last char. */ if (i < end_index) { hl.hl_startpos = linepos + chpos[i]; } } } } /* * Make a hilite for each string in a physical line which matches * the current pattern. * sp,ep delimit the first match already found. */ static void hilite_line(POSITION linepos, char *line, int line_len, int *chpos, char **sp, char **ep, int nsp, int cvt_ops) { char *searchp; char *line_end = line + line_len; /* * sp[0] and ep[0] delimit the first match in the line. * Mark the corresponding file positions, then * look for further matches and mark them. * {{ This technique, of calling match_pattern on subsequent * substrings of the line, may mark more than is correct * if the pattern starts with "^". This bug is fixed * for those regex functions that accept a notbol parameter * (currently POSIX, PCRE and V8-with-regexec2). }} * sp[i] and ep[i] for i>0 delimit subpattern matches. * Color each of them with its unique color. */ searchp = line; do { char *lep = sp[0]; int i; + if (sp[0] == NULL || ep[0] == NULL) + break; for (i = 1; i < nsp; i++) { if (sp[i] == NULL || ep[i] == NULL) break; if (ep[i] > sp[i]) { create_hilites(linepos, line, lep, sp[i], AT_HILITE | AT_COLOR_SEARCH, chpos); create_hilites(linepos, line, sp[i], ep[i], AT_HILITE | AT_COLOR_SUBSEARCH(i), chpos); lep = ep[i]; } } create_hilites(linepos, line, lep, ep[0], AT_HILITE | AT_COLOR_SEARCH, chpos); /* * If we matched more than zero characters, * move to the first char after the string we matched. * If we matched zero, just move to the next char. */ if (ep[0] > searchp) searchp = ep[0]; else if (searchp != line_end) searchp++; else /* end of line */ break; } while (match_pattern(info_compiled(&search_info), search_info.text, searchp, line_end - searchp, sp, ep, nsp, 1, search_info.search_type)); } #endif #if HILITE_SEARCH /* * Find matching text which is currently on screen and highlight it. */ static void hilite_screen(void) { struct scrpos scrpos; get_scrpos(&scrpos, TOP); if (scrpos.pos == NULL_POSITION) return; prep_hilite(scrpos.pos, position(BOTTOM_PLUS_ONE), -1); repaint_hilite(1); } /* * Change highlighting parameters. */ public void chg_hilite(void) { /* * Erase any highlights currently on screen. */ clr_hilite(); hide_hilite = 0; if (hilite_search == OPT_ONPLUS) /* * Display highlights. */ hilite_screen(); } #endif /* * Figure out where to start a search. */ static POSITION search_pos(int search_type) { POSITION pos; int sindex; if (empty_screen()) { /* * Start at the beginning (or end) of the file. * The empty_screen() case is mainly for * command line initiated searches; * for example, "+/xyz" on the command line. * Also for multi-file (SRCH_PAST_EOF) searches. */ if (search_type & SRCH_FORW) { pos = ch_zero(); } else { pos = ch_length(); if (pos == NULL_POSITION) { (void) ch_end_seek(); pos = ch_length(); } } sindex = 0; } else { int add_one = 0; if (how_search == OPT_ON) { /* * Search does not include current screen. */ if (search_type & SRCH_FORW) sindex = sc_height-1; /* BOTTOM_PLUS_ONE */ else sindex = 0; /* TOP */ } else if (how_search == OPT_ONPLUS && !(search_type & SRCH_AFTER_TARGET)) { /* * Search includes all of displayed screen. */ if (search_type & SRCH_FORW) sindex = 0; /* TOP */ else sindex = sc_height-1; /* BOTTOM_PLUS_ONE */ } else { /* * Search includes the part of current screen beyond the jump target. * It starts at the jump target (if searching backwards), * or at the jump target plus one (if forwards). */ sindex = sindex_from_sline(jump_sline); if (search_type & SRCH_FORW) add_one = 1; } pos = position(sindex); if (add_one) pos = forw_raw_line(pos, (char **)NULL, (int *)NULL); } /* * If the line is empty, look around for a plausible starting place. */ if (search_type & SRCH_FORW) { while (pos == NULL_POSITION) { if (++sindex >= sc_height) break; pos = position(sindex); } } else { while (pos == NULL_POSITION) { if (--sindex < 0) break; pos = position(sindex); } } return (pos); } /* * Check to see if the line matches the filter pattern. * If so, add an entry to the filter list. */ #if HILITE_SEARCH static int matches_filters(POSITION pos, char *cline, int line_len, int *chpos, POSITION linepos, char **sp, char **ep, int nsp) { struct pattern_info *filter; for (filter = filter_infos; filter != NULL; filter = filter->next) { int line_filter = match_pattern(info_compiled(filter), filter->text, cline, line_len, sp, ep, nsp, 0, filter->search_type); if (line_filter) { struct hilite hl; hl.hl_startpos = linepos; hl.hl_endpos = pos; add_hilite(&filter_anchor, &hl); free(cline); free(chpos); return (1); } } return (0); } #endif /* * Get the position of the first char in the screen line which * puts tpos on screen. */ static POSITION get_lastlinepos(POSITION pos, POSITION tpos, int sheight) { int nlines; for (nlines = 0;; nlines++) { POSITION npos = forw_line(pos); if (npos > tpos) { if (nlines < sheight) return NULL_POSITION; return pos; } pos = npos; } } /* * Get the segment index of tpos in the line starting at pos. * A segment is a string of printable chars that fills the screen width. */ static int get_seg(POSITION pos, POSITION tpos) { int seg; for (seg = 0;; seg++) { POSITION npos = forw_line_seg(pos, FALSE, FALSE, TRUE); if (npos > tpos) return seg; pos = npos; } } /* * Search a subset of the file, specified by start/end position. */ static int search_range(POSITION pos, POSITION endpos, int search_type, int matches, int maxlines, POSITION *plinepos, POSITION *pendpos, POSITION *plastlinepos) { char *line; char *cline; int line_len; LINENUM linenum; #define NSP (NUM_SEARCH_COLORS+2) char *sp[NSP]; char *ep[NSP]; int line_match; int cvt_ops; int cvt_len; int *chpos; POSITION linepos, oldpos; int skip_bytes = 0; int swidth = sc_width - line_pfx_width(); int sheight = sc_height - sindex_from_sline(jump_sline); linenum = find_linenum(pos); if (nosearch_headers && linenum <= header_lines) { linenum = header_lines + 1; pos = find_pos(linenum); } if (pos == NULL_POSITION) return (-1); oldpos = pos; /* When the search wraps around, end at starting position. */ if ((search_type & SRCH_WRAP) && endpos == NULL_POSITION) endpos = pos; for (;;) { /* * Get lines until we find a matching one or until * we hit end-of-file (or beginning-of-file if we're * going backwards), or until we hit the end position. */ if (ABORT_SIGS()) { /* * A signal aborts the search. */ return (-1); } if ((endpos != NULL_POSITION && !(search_type & SRCH_WRAP) && (((search_type & SRCH_FORW) && pos >= endpos) || ((search_type & SRCH_BACK) && pos <= endpos))) || maxlines == 0) { /* * Reached end position without a match. */ if (pendpos != NULL) *pendpos = pos; return (matches); } if (maxlines > 0) maxlines--; if (search_type & SRCH_FORW) { /* * Read the next line, and save the * starting position of that line in linepos. */ linepos = pos; pos = forw_raw_line(pos, &line, &line_len); if (linenum != 0) linenum++; } else { /* * Read the previous line and save the * starting position of that line in linepos. */ pos = back_raw_line(pos, &line, &line_len); linepos = pos; if (linenum != 0) linenum--; } if (pos == NULL_POSITION) { /* * Reached EOF/BOF without a match. */ if (search_type & SRCH_WRAP) { /* * The search wraps around the current file, so * try to continue at BOF/EOF. */ if (search_type & SRCH_FORW) { pos = ch_zero(); } else { pos = ch_length(); if (pos == NULL_POSITION) { (void) ch_end_seek(); pos = ch_length(); } } if (pos != NULL_POSITION) { /* * Wrap-around was successful. Clear * the flag so we don't wrap again, and * continue the search at new pos. */ search_type &= ~SRCH_WRAP; linenum = find_linenum(pos); continue; } } if (pendpos != NULL) *pendpos = oldpos; return (matches); } /* * If we're using line numbers, we might as well * remember the information we have now (the position * and line number of the current line). * Don't do it for every line because it slows down * the search. Remember the line number only if * we're "far" from the last place we remembered it. */ if (linenums && abs((int)(pos - oldpos)) > 2048) add_lnum(linenum, pos); oldpos = pos; #if HILITE_SEARCH if (is_filtered(linepos)) continue; #endif if (nosearch_headers) skip_bytes = skip_columns(header_cols, &line, &line_len); /* * If it's a caseless search, convert the line to lowercase. * If we're doing backspace processing, delete backspaces. */ cvt_ops = get_cvt_ops(search_type); cvt_len = cvt_length(line_len, cvt_ops); cline = (char *) ecalloc(1, cvt_len); chpos = cvt_alloc_chpos(cvt_len); cvt_text(cline, line, chpos, &line_len, cvt_ops); #if HILITE_SEARCH /* * If any filters are in effect, ignore non-matching lines. */ if (filter_infos != NULL && ((search_type & SRCH_FIND_ALL) || prep_startpos == NULL_POSITION || linepos < prep_startpos || linepos >= prep_endpos)) { if (matches_filters(pos, cline, line_len, chpos, linepos, sp, ep, NSP)) continue; } #endif /* * Test the next line to see if we have a match. * We are successful if we either want a match and got one, * or if we want a non-match and got one. */ if (prev_pattern(&search_info)) { line_match = match_pattern(info_compiled(&search_info), search_info.text, cline, line_len, sp, ep, NSP, 0, search_type); if (line_match) { /* * Got a match. */ if (search_type & SRCH_FIND_ALL) { #if HILITE_SEARCH /* * We are supposed to find all matches in the range. * Just add the matches in this line to the * hilite list and keep searching. */ hilite_line(linepos + skip_bytes, cline, line_len, chpos, sp, ep, NSP, cvt_ops); #endif } else if (--matches <= 0) { /* * Found the one match we're looking for. * Return it. */ #if HILITE_SEARCH if (hilite_search == OPT_ON) { /* * Clear the hilite list and add only * the matches in this one line. */ clr_hilite(); hilite_line(linepos + skip_bytes, cline, line_len, chpos, sp, ep, NSP, cvt_ops); } #endif if (chop_line()) { /* * If necessary, shift horizontally to make sure * search match is fully visible. */ if (sp[0] != NULL && ep[0] != NULL) { int start_off = sp[0] - cline; int end_off = ep[0] - cline; int save_hshift = hshift; int sshift; int eshift; hshift = 0; /* make get_seg count screen lines */ sshift = swidth * get_seg(linepos, linepos + chpos[start_off]); eshift = swidth * get_seg(linepos, linepos + chpos[end_off]); if (sshift >= save_hshift && eshift <= save_hshift) { hshift = save_hshift; } else { hshift = sshift; screen_trashed = 1; } } } else if (plastlinepos != NULL) { /* * If the line is so long that the highlighted match * won't be seen when the line is displayed normally * (starting at the first char) because it fills the whole * screen and more, scroll forward until the last char * of the match appears in the last line on the screen. * lastlinepos is the position of the first char of that last line. */ if (ep[0] != NULL) { int end_off = ep[0] - cline; if (end_off >= swidth * sheight / 4) /* heuristic */ *plastlinepos = get_lastlinepos(linepos, linepos + chpos[end_off], sheight); } } free(cline); free(chpos); if (plinepos != NULL) *plinepos = linepos; return (0); } } } free(cline); free(chpos); } } /* * search for a pattern in history. If found, compile that pattern. */ static int hist_pattern(int search_type) { #if CMD_HISTORY char *pattern; set_mlist(ml_search, 0); pattern = cmd_lastpattern(); if (pattern == NULL) return (0); if (set_pattern(&search_info, pattern, search_type, 1) < 0) return (-1); #if HILITE_SEARCH if (hilite_search == OPT_ONPLUS && !hide_hilite) hilite_screen(); #endif return (1); #else /* CMD_HISTORY */ return (0); #endif /* CMD_HISTORY */ } /* * Change the caseless-ness of searches. * Updates the internal search state to reflect a change in the -i flag. */ public void chg_caseless(void) { if (!search_info.is_ucase_pattern) { /* * Pattern did not have uppercase. * Set the search caselessness to the global caselessness. */ is_caseless = caseless; /* * If regex handles caseless, we need to discard * the pattern which was compiled with the old caseless. */ if (!re_handles_caseless) /* We handle caseless, so the pattern doesn't change. */ return; } /* * Regenerate the pattern using the new state. */ clear_pattern(&search_info); (void) hist_pattern(search_info.search_type); } /* * Search for the n-th occurrence of a specified pattern, * either forward or backward. * Return the number of matches not yet found in this file * (that is, n minus the number of matches found). * Return -1 if the search should be aborted. * Caller may continue the search in another file * if less than n matches are found in this file. */ public int search(int search_type, char *pattern, int n) { POSITION pos; POSITION opos; POSITION lastlinepos = NULL_POSITION; if (pattern == NULL || *pattern == '\0') { /* * A null pattern means use the previously compiled pattern. */ search_type |= SRCH_AFTER_TARGET; if (!prev_pattern(&search_info)) { int r = hist_pattern(search_type); if (r == 0) error("No previous regular expression", NULL_PARG); if (r <= 0) return (-1); } if ((search_type & SRCH_NO_REGEX) != (search_info.search_type & SRCH_NO_REGEX)) { error("Please re-enter search pattern", NULL_PARG); return -1; } #if HILITE_SEARCH if (hilite_search == OPT_ON || status_col) { /* * Erase the highlights currently on screen. * If the search fails, we'll redisplay them later. */ repaint_hilite(0); } if (hilite_search == OPT_ONPLUS && hide_hilite) { /* * Highlight any matches currently on screen, * before we actually start the search. */ hide_hilite = 0; hilite_screen(); } hide_hilite = 0; #endif } else { /* * Compile the pattern. */ int show_error = !(search_type & SRCH_INCR); if (set_pattern(&search_info, pattern, search_type, show_error) < 0) return (-1); #if HILITE_SEARCH if (hilite_search || status_col) { /* * Erase the highlights currently on screen. * Also permanently delete them from the hilite list. */ repaint_hilite(0); hide_hilite = 0; clr_hilite(); } if (hilite_search == OPT_ONPLUS || status_col) { /* * Highlight any matches currently on screen, * before we actually start the search. */ hilite_screen(); } #endif } /* * Figure out where to start the search. */ pos = search_pos(search_type); opos = position(sindex_from_sline(jump_sline)); if (pos == NULL_POSITION) { /* * Can't find anyplace to start searching from. */ if (search_type & SRCH_PAST_EOF) return (n); #if HILITE_SEARCH if (hilite_search == OPT_ON || status_col) repaint_hilite(1); #endif error("Nothing to search", NULL_PARG); return (-1); } n = search_range(pos, NULL_POSITION, search_type, n, -1, &pos, (POSITION*)NULL, &lastlinepos); if (n != 0) { /* * Search was unsuccessful. */ #if HILITE_SEARCH if ((hilite_search == OPT_ON || status_col) && n > 0) /* * Redisplay old hilites. */ repaint_hilite(1); #endif return (n); } if (!(search_type & SRCH_NO_MOVE)) { /* * Go to the matching line. */ if (lastlinepos != NULL_POSITION) jump_loc(lastlinepos, BOTTOM); else if (pos != opos) jump_loc(pos, jump_sline); } #if HILITE_SEARCH if (hilite_search == OPT_ON || status_col) /* * Display new hilites in the matching line. */ repaint_hilite(1); #endif return (0); } #if HILITE_SEARCH /* * Prepare hilites in a given range of the file. * * The pair (prep_startpos,prep_endpos) delimits a contiguous region * of the file that has been "prepared"; that is, scanned for matches for * the current search pattern, and hilites have been created for such matches. * If prep_startpos == NULL_POSITION, the prep region is empty. * If prep_endpos == NULL_POSITION, the prep region extends to EOF. * prep_hilite asks that the range (spos,epos) be covered by the prep region. */ public void prep_hilite(POSITION spos, POSITION epos, int maxlines) { POSITION nprep_startpos = prep_startpos; POSITION nprep_endpos = prep_endpos; POSITION new_epos; POSITION max_epos; int result; int i; /* * Search beyond where we're asked to search, so the prep region covers * more than we need. Do one big search instead of a bunch of small ones. */ #define SEARCH_MORE (3*size_linebuf) if (!prev_pattern(&search_info) && !is_filtering()) return; /* * Make sure our prep region always starts at the beginning of * a line. (search_range takes care of the end boundary below.) */ spos = back_raw_line(spos+1, (char **)NULL, (int *)NULL); /* * If we're limited to a max number of lines, figure out the * file position we should stop at. */ if (maxlines < 0) max_epos = NULL_POSITION; else { max_epos = spos; for (i = 0; i < maxlines; i++) max_epos = forw_raw_line(max_epos, (char **)NULL, (int *)NULL); } /* * Find two ranges: * The range that we need to search (spos,epos); and the range that * the "prep" region will then cover (nprep_startpos,nprep_endpos). */ if (prep_startpos == NULL_POSITION || (epos != NULL_POSITION && epos < prep_startpos) || spos > prep_endpos) { /* * New range is not contiguous with old prep region. * Discard the old prep region and start a new one. */ clr_hilite(); clr_filter(); if (epos != NULL_POSITION) epos += SEARCH_MORE; nprep_startpos = spos; } else { /* * New range partially or completely overlaps old prep region. */ if (epos == NULL_POSITION) { /* * New range goes to end of file. */ ; } else if (epos > prep_endpos) { /* * New range ends after old prep region. * Extend prep region to end at end of new range. */ epos += SEARCH_MORE; } else /* (epos <= prep_endpos) */ { /* * New range ends within old prep region. * Truncate search to end at start of old prep region. */ epos = prep_startpos; } if (spos < prep_startpos) { /* * New range starts before old prep region. * Extend old prep region backwards to start at * start of new range. */ if (spos < SEARCH_MORE) spos = 0; else spos -= SEARCH_MORE; nprep_startpos = spos; } else /* (spos >= prep_startpos) */ { /* * New range starts within or after old prep region. * Trim search to start at end of old prep region. */ spos = prep_endpos; } } if (epos != NULL_POSITION && max_epos != NULL_POSITION && epos > max_epos) /* * Don't go past the max position we're allowed. */ epos = max_epos; if (epos == NULL_POSITION || epos > spos) { int search_type = SRCH_FORW | SRCH_FIND_ALL; search_type |= (search_info.search_type & (SRCH_NO_REGEX|SRCH_SUBSEARCH_ALL)); for (;;) { result = search_range(spos, epos, search_type, 0, maxlines, (POSITION*)NULL, &new_epos, (POSITION*)NULL); if (result < 0) return; if (prep_endpos == NULL_POSITION || new_epos > prep_endpos) nprep_endpos = new_epos; /* * Check both ends of the resulting prep region to * make sure they're not filtered. If they are, * keep going at least one more line until we find * something that isn't filtered, or hit the end. */ if (prep_endpos == NULL_POSITION || nprep_endpos > prep_endpos) { if (new_epos >= nprep_endpos && is_filtered(new_epos-1)) { spos = nprep_endpos; epos = forw_raw_line(nprep_endpos, (char **)NULL, (int *)NULL); if (epos == NULL_POSITION) break; maxlines = 1; continue; } } if (prep_startpos == NULL_POSITION || nprep_startpos < prep_startpos) { if (nprep_startpos > 0 && is_filtered(nprep_startpos)) { epos = nprep_startpos; spos = back_raw_line(nprep_startpos, (char **)NULL, (int *)NULL); if (spos == NULL_POSITION) break; nprep_startpos = spos; maxlines = 1; continue; } } break; } } prep_startpos = nprep_startpos; prep_endpos = nprep_endpos; } /* * Set the pattern to be used for line filtering. */ public void set_filter_pattern(char *pattern, int search_type) { struct pattern_info *filter; clr_filter(); if (pattern == NULL || *pattern == '\0') { /* Clear and free all filters. */ for (filter = filter_infos; filter != NULL; ) { struct pattern_info *next_filter = filter->next; clear_pattern(filter); free(filter); filter = next_filter; } filter_infos = NULL; } else { /* Create a new filter and add it to the filter_infos list. */ filter = ecalloc(1, sizeof(struct pattern_info)); init_pattern(filter); if (set_pattern(filter, pattern, search_type, 1) < 0) { free(filter); return; } filter->next = filter_infos; filter_infos = filter; } screen_trashed = 1; } /* * Is there a line filter in effect? */ public int is_filtering(void) { if (ch_getflags() & CH_HELPFILE) return (0); return (filter_infos != NULL); } #endif #if HAVE_V8_REGCOMP /* * This function is called by the V8 regcomp to report * errors in regular expressions. */ public int reg_show_error = 1; void regerror(char *s) { PARG parg; if (!reg_show_error) return; parg.p_string = s; error("%s", &parg); } #endif diff --git a/contrib/less/version.c b/contrib/less/version.c index b0e4e6668da3..8c20787bfd4e 100644 --- a/contrib/less/version.c +++ b/contrib/less/version.c @@ -1,986 +1,998 @@ /* * Copyright (C) 1984-2023 Mark Nudelman * * You may distribute under the terms of either the GNU General Public * License or the Less License, as specified in the README file. * * For more information, see the README file. */ /* ----------------------- CHANGE HISTORY -------------------------- 1/29/84 Allowed use on standard input 2/1/84 Added E, N, P commands 4/17/84 Added '=' command, 'stop' signal handling 4/20/84 Added line folding v2 4/27/84 Fixed '=' command to use BOTTOM_PLUS_ONE, instead of TOP, added 'p' & 'v' commands v3 5/3/84 Added -m and -t options, '-' command v4 5/3/84 Added LESS environment variable v5 5/3/84 New comments, fixed '-' command slightly v6 5/15/84 Added -Q, visual bell v7 5/24/84 Fixed jump_back(n) bug: n should count real lines, not folded lines. Also allow number on G command. v8 5/30/84 Re-do -q and -Q commands v9 9/25/84 Added "+" argument v10 10/10/84 Fixed bug in -b argument processing v11 10/18/84 Made error() ring bell if \n not entered. ----------------------------------------------------------------- v12 2/13/85 Reorganized signal handling and made portable to 4.2bsd. v13 2/16/85 Reword error message for '-' command. v14 2/22/85 Added -bf and -bp variants of -b. v15 2/25/85 Miscellaneous changes. v16 3/13/85 Added -u flag for backspace processing. v17 4/13/85 Added j and k commands, changed -t default. v18 4/20/85 Rewrote signal handling code. v19 5/2/85 Got rid of "verbose" eq_message(). Made search() scroll in some cases. v20 5/21/85 Fixed screen.c ioctls for System V. v21 5/23/85 Fixed some first_cmd bugs. v22 5/24/85 Added support for no RECOMP nor REGCMP. v23 5/25/85 Miscellanous changes and prettying up. Posted to USENET. ----------------------------------------------------------------- v24 6/3/85 Added ti,te terminal init & de-init. (Thanks to Mike Kersenbrock) v25 6/8/85 Added -U flag, standout mode underlining. v26 6/9/85 Added -M flag. Use underline termcap (us) if it exists. v27 6/15/85 Renamed some variables to make unique in 6 chars. Minor fix to -m. v28 6/28/85 Fixed right margin bug. v29 6/28/85 Incorporated M.Rose's changes to signal.c v30 6/29/85 Fixed stupid bug in argument processing. v31 7/15/85 Added -p flag, changed repaint algorithm. Added kludge for magic cookie terminals. v32 7/16/85 Added cat_file if output not a tty. v33 7/23/85 Added -e flag and EDITOR. v34 7/26/85 Added -s flag. v35 7/27/85 Rewrote option handling; added option.c. v36 7/29/85 Fixed -e flag to work if not last file. v37 8/10/85 Added -x flag. v38 8/19/85 Changed prompting; created prompt.c. v39 8/24/85 (Not -p) does not initially clear screen. v40 8/26/85 Added "skipping" indicator in forw(). Posted to USENET. ----------------------------------------------------------------- v41 9/17/85 ONLY_RETURN, control char commands, faster search, other minor fixes. v42 9/25/85 Added ++ command line syntax; ch_fsize for pipes. v43 10/15/85 Added -h flag, changed prim.c algorithms. v44 10/16/85 Made END print in all cases of eof; ignore SIGTTOU after receiv ing SIGTSTP. v45 10/16/85 Never print backspaces unless -u. v46 10/24/85 Backwards scroll in jump_loc. v47 10/30/85 Fixed bug in edit(): *first_cmd==0 v48 11/16/85 Use TIOCSETN instead of TIOCSETP. Added marks (m and ' commands). Posted to USENET. ----------------------------------------------------------------- v49 1/9/86 Fixed bug: signal didn't clear mcc. v50 1/15/86 Added ' (quote) to gomark. v51 1/16/86 Added + cmd, fixed problem if first_cmd fails, made g cmd sort of "work" on pipes ev en if bof is no longer buffered. v52 1/17/86 Made short files work better. v53 1/20/86 Added -P option. v54 1/20/86 Changed help to use HELPFILE. v55 1/23/86 Messages work better if not tty output. v56 1/24/86 Added -l option. v57 1/31/86 Fixed -l to get confirmation before ov erwriting an existing file. v58 8/28/86 Added filename globbing. v59 9/15/86 Fixed some bugs with very long filenames. v60 9/26/86 Incorporated changes from Leith (Casey) Leedom for boldface and -z option. v61 9/26/86 Got rid of annoying repaints after ! cmd. Posted to USENET. ----------------------------------------------------------------- v62 12/23/86 Added is_directory(); change -z default to -1 instead of 24; cat-and-exit if -e and file is less than a screenful. v63 1/8/87 Fixed bug in cat-and-exit if > 1 file. v64 1/12/87 Changed puts/putstr, putc/putchr, getc/getchr to av oid name conflict with stdio functions. v65 1/26/87 Allowed '-' command to change NUMBER v alued options (thanks to Gary Puckering) v66 2/13/87 Fixed bug: prepaint should use force=1. v67 2/24/87 Added !! and % expansion to ! command. v68 2/25/87 Added SIGWINCH and TIOCGWINSZ support; changed is_directory to bad_file. (thanks to J. Robert Ward) v69 2/25/87 Added SIGWIND and WIOCGETD (for Unix PC). v70 3/13/87 Changed help cmd from 'h' to 'H'; better error msgs in bad_file, errno_message. v71 5/11/87 Changed -p to -c, made triple -c/-C for clear-eol like more's -c. v72 6/26/87 Added -E, -L, use $SHELL in lsystem(). (thanks to Stev e Spearman) v73 6/26/87 Allow Examine "#" for previous file. Posted to USENET 8/25/87. ----------------------------------------------------------------- v74 9/18/87 Fix conflict in EOF symbol with stdio.h, Make os.c more portable to BSD. v75 9/23/87 Fix problems in get_term (thanks to Paul Eggert); new backwards scrolling in jump_loc (thanks to Marion Hakanson). v76 9/23/87 Added -i flag; allow single "!" to inv oke a shell (thanks to Franco Barber). v77 9/24/87 Added -n flag and line number support. v78 9/25/87 Fixed problem with prompts longer than the screen width. v79 9/29/87 Added the _ command. v80 10/6/87 Allow signal to break out of linenum scan. v81 10/6/87 Allow -b to be changed from within less. v82 10/7/87 Add cmd_decode to use a table for key binding (thanks to Dav id Nason). v83 10/9/87 Allow .less file for user-defined keys. v84 10/11/87 Fix -e/-E problems (thanks to Felix Lee). v85 10/15/87 Search now keeps track of line numbers. v86 10/20/87 Added -B option and autobuf; fixed "pipe error" bug. v87 3/1/88 Fix bug re BSD signals while reading file. v88 3/12/88 Use new format for -P option (thanks to der Mouse), allow "+-c" without message, fix bug re BSD hangup. v89 3/18/88 Turn off line numbers if linenum scan is interrupted. v90 3/30/88 Allow -P from within less. v91 3/30/88 Added tags file support (new -t option) (thanks to Brian Campbell). v92 4/4/88 Added -+option syntax. v93 4/11/88 Add support for slow input (thanks to Joe Orost & apologies for taking almost 3 years to get this in!) v94 4/11/88 Redo reading/signal stuff. v95 4/20/88 Repaint screen better after signal. v96 4/21/88 Add /! and ?! commands. v97 5/17/88 Allow -l/-L from within less. Eliminate some static arrays (use calloc). Posted to USENET. ----------------------------------------------------------------- v98 10/14/88 Fix incorrect calloc call; uninitialized var in exec_mca; core dump on unknown TERM. Make v cmd work if past last line of file. Fix some signal bugs. v99 10/29/88 Allow space between -X and string, when X is a string-valued option. v100 1/5/89 Fix globbing bug when $SHELL not set; allow spaces after -t command. v101 1/6/89 Fix problem with long (truncated) lines in tags file (thanks to Neil Dixon). v102 1/6/89 Fix bug with E# when no prev file; allow spaces after -l command. v103 3/14/89 Add -N, -f and -? options. Add z and w commands. Add %L for prompt strings. v104 3/16/89 Added EDITPROTO. v105 3/20/89 Fix bug in find_linenum which cached incorrectly on long lines. v106 3/31/89 Added -k option and multiple lesskey files. v107 4/27/89 Add 8-bit char support and -g option. Split option code into 3 files. v108 5/5/89 Allocate position table dynamically (thanks to Paul Eggert); change % command from "percent" to vi-style brace finder. v109 5/10/89 Added ESC-% command, split prim.c. v110 5/24/89 Fixed bug in + option; fixed repaint bug under Sun windows (thanks to Paul Eggert). v111 5/25/89 Generalized # and % expansion; use calloc for some error messages. v112 5/30/89 Get rid of ESC-%, add {}()[] commands. v113 5/31/89 Optimize lseeks (thanks to Paul Eggert). v114 7/25/89 Added ESC-/ and ESC-/! commands. v115 7/26/89 Added ESC-n command. v116 7/31/89 Added find_pos to optimize g command. v117 8/1/89 Change -f option to -r. v118 8/2/89 Save positions for all previous files, not just the immediately previous one. v119 8/7/89 Save marks across file boundaries. Add file handle stuff. v120 8/11/89 Add :ta command. v121 8/16/89 Add -f option. v122 8/30/89 Fix performance with many buffers. v123 8/31/89 Verbose prompts for string options. Posted beta to USENET. ----------------------------------------------------------------- v124 9/18/89 Reorganize search commands, N = rev, ESC-n = span, add ESC-N. v125 9/18/89 Fix tab bug (thanks to Alex Liu). Fix EOF bug when both -w and -c. v126 10/25/89 Add -j option. v127 10/27/89 Fix problems with blank lines before BOF. v128 10/27/89 Add %bj, etc. to prompt strings. v129 11/3/89 Add -+,-- commands; add set-option and unset-option to lesskey. v130 11/6/89 Generalize A_EXTRA to string, remove set-option, unset-option from lesskey. v131 11/7/89 Changed name of EDITPROTO to LESSEDIT. v132 11/8/89 Allow editing of command prefix. v133 11/16/89 Add -y option (thanks to Jeff Sullivan). v134 12/1/89 Glob filenames in the -l command. v135 12/5/89 Combined {}()[] commands into one, and added ESC-^F and ESC-^B commands. v136 1/20/90 Added -S, -R flags. Added | command. Added warning for binary files. (thanks to Richard Brittain and J. Sullivan). v137 1/21/90 Rewrote horrible pappend code. Added * notation for hi-bit chars. v138 1/24/90 Fix magic cookie terminal handling. Get rid of "cleanup" loop in ch_get. v139 1/27/90 Added MSDOS support. (many thanks to Richard Brittain). v140 2/7/90 Editing a new file adds it to the command line list. v141 2/8/90 Add edit_list for editing >1 file. v142 2/10/90 Add :x command. v143 2/11/90 Add * and @ modifies to search cmds. Change ESC-/ cmd from /@* to / *. v144 3/1/90 Messed around with ch_zero; no real change. v145 3/2/90 Added -R and -v/-V for MSDOS; renamed FILENAME to avoid conflict. v146 3/5/90 Pull cmdbuf functions out of command.c v147 3/7/90 Implement ?@; fix multi-file edit bugs. v148 3/29/90 Fixed bug in :e then :e#. v149 4/3/90 Change error,ierror,query to use PARG. v150 4/6/90 Add LESS_CHARSET, LESS_CHARDEF. v151 4/13/90 Remove -g option; clean up ispipe. v152 4/14/90 lsystem() closes input file, for editors which require exclusive open. v153 4/18/90 Fix bug if SHELL unset; fix bug in overstrike control char. v154 4/25/90 Output to fd 2 via buffer. v155 4/30/90 Ignore -i if uppercase in pattern (thanks to Michael Rendell.) v156 5/3/90 Remove scroll limits in forw() & back(); causes problems with -c. v157 5/4/90 Forward search starts at next real line (not screen line) after jump target. v158 6/14/90 Added F command. v159 7/29/90 Fix bug in exiting: output not flushed. v160 7/29/90 Clear screen before initial output w/ -c. v161 7/29/90 Add -T flag. v162 8/14/90 Fix bug with +F on command line. v163 8/21/90 Added LESSBINFMT variable. v164 9/5/90 Added -p, LINES, COLUMNS and unset mark ' == BOF, for 1003.2 D5. v165 9/6/90 At EOF with -c set, don't display empty screen when try to page forward. v166 9/6/90 Fix G when final line in file wraps. v167 9/11/90 Translate CR/LF -> LF for 1003.2. v168 9/13/90 Return to curr file if "tag not found". v169 12/12/90 G goes to EOF even if file has grown. v170 1/17/91 Add optimization for BSD _setjmp; fix #include ioctl.h TERMIO problem. (thanks to Paul Eggert) Posted to USENET. ----------------------------------------------------------------- v171 3/6/91 Fix -? bug in get_filename. v172 3/15/91 Fix G bug in empty file. Fix bug with ?\n and -i and uppercase pattern at EOF! (thanks to Paul Eggert) v173 3/17/91 Change N cmd to not permanently change direction. (thanks to Brian Matthews) v174 3/18/91 Fix bug with namelogfile not getting cleared when change files. v175 3/18/91 Fix bug with ++cmd on command line. (thanks to Jim Meyering) v176 4/2/91 Change | to not force current screen, include marked line, start/end from top of screen. Improve search speed. (thanks to Don Mears) v177 4/2/91 Add LESSHELP variable. Fix bug with F command with -e. Try /dev/tty for input before using fd 2. Patches posted to USENET 4/2/91. ----------------------------------------------------------------- v178 4/8/91 Fixed bug in globbing logfile name. (thanks to Jim Meyering) v179 4/9/91 Allow negative -z for screen-relative. v180 4/9/91 Clear to eos rather than eol if "db"; don't use "sr" if "da". (thanks to Tor Lillqvist) v181 4/18/91 Fixed bug with "negative" chars 80 - FF. (thanks to Benny Sander Hofmann) v182 5/16/91 Fixed bug with attribute at EOL. (thanks to Brian Matthews) v183 6/1/91 Rewrite linstall to do smart config. v184 7/11/91 Process \b in searches based on -u rather than -i. v185 7/11/91 -Pxxx sets short prompt; assume SIGWINCH after a SIGSTOP. (thanks to Ken Laprade) ----------------------------------------------------------------- v186 4/20/92 Port to MS-DOS (Microsoft C). v187 4/23/92 Added -D option & TAB_COMPLETE_FILENAME. v188 4/28/92 Added command line editing features. v189 12/8/92 Fix mem overrun in anscreen.c:init; fix edit_list to recover from bin file. v190 2/13/93 Make TAB enter one filename at a time; create ^L with old TAB functionality. v191 3/10/93 Defer creating "flash" page for MS-DOS. v192 9/6/93 Add BACK-TAB. v193 9/17/93 Simplify binary_file handling. v194 1/4/94 Add rudiments of alt_filename handling. v195 1/11/94 Port back to Unix; support keypad. ----------------------------------------------------------------- v196 6/7/94 Fix bug with bad filename; fix IFILE type problem. (thanks to David MacKenzie) v197 6/7/94 Fix bug with .less tables inserted wrong. v198 6/23/94 Use autoconf installation technology. (thanks to David MacKenzie) v199 6/29/94 Fix MS-DOS build (thanks to Tim Wiegman). v200 7/25/94 Clean up copyright, minor fixes. Posted to prep.ai.mit.edu ----------------------------------------------------------------- v201 7/27/94 Check for no memcpy; add casts to calloc; look for regcmp in libgen.a. (thanks to Kaveh Ghazi). v202 7/28/94 Fix bug in edit_next/edit_prev with non-existent files. v203 8/2/94 Fix a variety of configuration bugs on various systems. (thanks to Sakai Kiyotaka, Harald Koenig, Bjorn Brox, Teemu Rantanen, and Thorsten Lockert) v204 8/3/94 Use strerror if available. (thanks to J.T. Conklin) v205 8/5/94 Fix bug in finding "me" termcap entry. (thanks to Andreas Stolcke) 8/10/94 v205+: Change BUFSIZ to LBUFSIZE to avoid name conflict with stdio.h. Posted to prep.ai.mit.edu ----------------------------------------------------------------- v206 8/10/94 Use initial_scrpos for -t to avoid displaying first page before init(). (thanks to Dominique Petitpierre) v207 8/12/94 Fix bug if stdout is not tty. v208 8/16/94 Fix bug in close_altfile if goto err1 in edit_ifile. (Thanks to M.J. Hewitt) v209 8/16/94 Change scroll to wscroll to avoid conflict with library function. v210 8/16/94 Fix bug with bold on 8 bit chars. (thanks to Vitor Duarte) v211 8/16/94 Don't quit on EOI in jump_loc / forw. v212 8/18/94 Use time_t if available. v213 8/20/94 Allow ospeed to be defined in termcap.h. v214 8/20/94 Added HILITE_SEARCH, -F, ESC-u cmd. (thanks to Paul Lew and Bob Byrnes) v215 8/23/94 Fix -i toggle behavior. v216 8/23/94 Process BS in all searches, not only -u. v217 8/24/94 Added -X flag. v218 8/24/94 Reimplement undo_search. v219 8/24/94 Find tags marked with line number instead of pattern. v220 8/24/94 Stay at same position after SIG_WINCH. v221 8/24/94 Fix bug in file percentage in big file. v222 8/25/94 Do better if can't reopen current file. v223 8/27/94 Support setlocale. (thanks to Robert Joop) v224 8/29/94 Revert v216: process BS in search only if -u. v225 9/6/94 Rewrite undo_search again: toggle. v226 9/15/94 Configuration fixes. (thanks to David MacKenzie) v227 9/19/94 Fixed strerror config problem. Posted to prep.ai.mit.edu ----------------------------------------------------------------- v228 9/21/94 Fix bug in signals: repeated calls to get_editkeys overflowed st_edittable. v229 9/21/94 Fix "Nothing to search" error if -a and SRCH_PAST_EOF. v230 9/21/94 Don't print extra error msg in search after regerror(). v231 9/22/94 Fix hilite bug if search matches 0 chars. (thanks to John Polstra) v232 9/23/94 Deal with weird systems that have termios.h but not tcgetattr(). Posted to prep.ai.mit.edu ----------------------------------------------------------------- v233 9/26/94 Use get_term() instead of pos_init() in psignals to re-get lower_left termcap. (Thanks to John Malecki) v234 9/26/94 Make MIDDLE closer to middle of screen. v235 9/27/94 Use local strchr if system doesn't have. v236 9/28/94 Don't use libucb; use libterm if libtermcap & libcurses doesn't work. (Fix for Solaris; thanks to Frank Kaefer) v237 9/30/94 Use system isupper() etc if provided. Posted to prep.ai.mit.edu ----------------------------------------------------------------- v238 10/6/94 Make binary non-blinking if LESSBINFMT is set to a string without a *. v239 10/7/94 Don't let delimit_word run back past beginning of cmdbuf. v240 10/10/94 Don't write into termcap buffer. (Thanks to Benoit Speckel) v241 10/13/94 New lesskey file format. Don't expand filenames in search command. v242 10/14/94 Allow lesskey specification of "literal". v243 10/14/94 Add #stop command to lesskey. v244 10/16/94 Add -f flag to lesskey. v245 10/25/94 Allow TAB_COMPLETE_FILENAME to be undefd. v246 10/27/94 Move help file to /usr/local/share. v247 10/27/94 Add -V option. v248 11/5/94 Add -V option to lesskey. v249 11/5/94 Remove -f flag from lesskey; default input file is ~/.lesskey.in, not stdin. v250 11/7/94 Lesskey input file "-" means stdin. v251 11/9/94 Convert cfgetospeed result to ospeed. (Thanks to Andrew Chernov) v252 11/16/94 Change default lesskey input file from .lesskey.in to .lesskey. Posted to prep.ai.mit.edu ----------------------------------------------------------------- v253 11/21/94 Fix bug when tags file has a backslash. v254 12/6/94 Fix -k option. v255 12/8/94 Add #define EXAMINE to disable :e etc. v256 12/10/94 Change highlighting: only highlite search results (but now it is reliable). v257 12/10/94 Add goto_line and repaint_highlight to optimize highlight repaints. v258 12/12/94 Fixup in hilite_line if BS_SPECIAL. v259 12/12/94 Convert to autoconf 2.0. v260 12/13/94 Add SECURE define. v261 12/14/94 Use system WERASE char as EC_W_BACKSPACE. v262 12/16/94 Add -g/-G flag and screen_hilite. v263 12/20/94 Reimplement/optimize -G flag behavior. v264 12/23/94 Allow EXTRA string after line-edit cmd in lesskey file. v265 12/24/94 Add LESSOPEN=|cmd syntax. v266 12/26/94 Add -I flag. v267 12/28/94 Formalize the four-byte header emitted by a LESSOPEN pipe. v268 12/28/94 Get rid of four-byte header. v269 1/2/95 Close alt file before open new one. Avoids multiple popen(). v270 1/3/95 Use VISUAL; use S_ISDIR/S_ISREG; fix config problem with Solaris POSIX regcomp. v271 1/4/95 Don't quit on read error. v272 1/5/95 Get rid of -L. v273 1/6/95 Fix ch_ungetchar bug; don't call LESSOPEN on a pipe. v274 1/6/95 Ported to OS/2 (thanks to Kai Uwe Rommel) v275 1/18/95 Fix bug if toggle -G at EOF. v276 1/30/95 Fix OS/2 version. v277 1/31/95 Add "next" charset; don't display ^X for X > 128. v278 2/14/95 Change default for -G. Posted to prep.ai.mit.edu ----------------------------------------------------------------- v279 2/22/95 Add GNU options --help, --version. Minor config fixes. v280 2/24/95 Clean up calls to glob(); don't set # if we can't open the new file. v281 2/24/95 Repeat search should turn on hilites. v282 3/2/95 Minor fixes. v283 3/2/95 Fix homefile; make OS2 look in $HOME. v284 3/2/95 Error if "v" on LESSOPENed file; "%" figures out file size on pipe. v285 3/7/95 Don't set # in lsystem; lesskey try $HOME first. v286 3/7/95 Reformat change history (too much free time?). v287 3/8/95 Fix hilite bug if overstrike multiple chars. v288 3/8/95 Allow lesskey to override get_editkey keys. v289 3/9/95 Fix adj_hilite bug when line gets processed by hilite_line more than once. v290 3/9/95 Make configure automatically. Fix Sequent problem with incompatible sigsetmask(). Posted to prep.ai.mit.edu ----------------------------------------------------------------- v291 3/21/95 Add #env to lesskey. Fix MS-DOS build. Posted to simtel. ----------------------------------------------------------------- v292 4/24/95 Add MS-DOS support for Borland C. Fix arrow keys in MS-DOS versions. v293 4/28/95 Add auto-versioning stuff to make dist. v294 5/12/95 Fix Borland build. v295 1/20/96 Fix search on squished file; add /@@. v296 1/23/96 Allow cmdbuf larger than screen width. v297 1/24/96 Don't call termcap if tgetent fails; add #defines for buffers. v298 1/24/96 Change @@ to ^K. Add alternate search modifiers ^N, ^F, ^E. v299 1/25/96 Fix percent overflow in jump_percent (thanks to Brent Wiese); don't send "ti" after shell command till RETURN pressed. v300 1/25/96 Change -U to print tabs as ^I. v301 1/30/96 Make hilites work in cmd F output. v302 1/31/96 Fix cmd F to notice window-change signals. v303 1/31/96 Add ESC-SPACE command. v304 2/1/96 Add ^R search modifier; add LESSSECURE. v305 2/2/96 Workaround Linux /proc kernel bug; add LESSKEY. v306 3/16/96 Minor fixes. v307 3/25/96 Allow cmd line arg "--"; fix DOS & OS/2 defines.h. v308 4/4/96 Port to OS-9 (thanks to Boisy Pitre); fix -d. v309 4/9/96 Fix OS-9 version; fix tags bug with "$". v310 4/10/96 Get rid of HELPFILE. v311 4/22/96 Add Windows32 support; merge doscreen.c into screen.c. v312 4/24/96 Don't quit after "cannot reopen" error. v313 4/25/96 Added horizontal scrolling. v314 4/26/96 Modified -e to quit on reaching end of a squished file. v315 4/26/96 Fix "!;TAB" bug. v316 5/2/96 Make "|a" when (a < curr screen) go to end of curr screen. v317 5/14/96 Various fixes for the MS-DOS and OS/2 builds. Added ## and %% handling for filenames v318 5/29/96 Port to OS-9 Microware compiler; minor fixes (thanks to Martin Gregorie). v319 7/8/96 Fix Windows port (thanks to Jeff Paquette). v320 7/11/96 Final fixes for Windows port. v321 7/18/96 Minor fixes. Posted to Web page. ----------------------------------------------------------------- v322 8/13/96 Fix bug in shell escape from help file; add support for Microsoft Visual C under Windows; numerous small fixes. v323 8/19/96 Fixes for Windows version (thanks to Simon Munton); fix for Linux library weirdness (thanks to Jim Diamond); port to DJGPP (thanks to Eli Zaretskii). v324 8/21/96 Add support for spaces in filenames (thanks to Simon Munton). v325 8/21/96 Add lessecho, for spaces in filenames under Unix. v326 8/27/96 Fix DJGPP version. v327 9/1/96 Reorganize lglob, make spaces in filenames work better in Unix. v328 10/7/96 Append / to directory name in filename completion. Fix MS-DOS and OS-9 versions. v329 10/11/96 Fix more MS-DOS bugs; add LESSSEPARATOR; add -" option. Add LESSMETACHARS, LESSMETAESCAPE. v330 10/21/96 Minor fixes. Posted to Web page. ----------------------------------------------------------------- v331 4/22/97 Various Windows fixes (thanks to Gurusamy Sarathy). v332 4/22/97 Enter filenames from cmd line into edit history. Posted to Web page. ----------------------------------------------------------------- v333 3/4/99 Changed -w to highlite new line after forward movement. v334 3/9/99 Avoid overflowing prompt buffer; add %d and %D. v335 3/20/99 Add EBCDIC support (thanks to Thomas Dorner). Use HOMEDRIVE/HOMEPATH on Windows (thanks to Preston Bannister). Posted to Web page. ----------------------------------------------------------------- v336 4/8/99 Fix installation bugs. v337 4/9/99 Fix another installation bug. Posted to Web page. ----------------------------------------------------------------- v338 4/13/99 Add support for long option names. v339 4/18/99 Add \k, long option names to lesskey. Add -^P. Add :d. v340 4/21/99 Add regexec2. Fix Windows build. Posted to Web page. ----------------------------------------------------------------- v341 5/6/99 Add -F option; %c & ?c prompt escapes. (Thanks to Michele Maltoni) v342 7/22/99 Add system-wide lesskey file; allow GPL or Less License. v343 9/23/99 Support UTF-8 (Thanks to Robert Brady). Add %P and ?P in prompts. v344 10/27/99 -w highlights target line of g and p commands. v345 10/29/99 Make -R pass thru ESC but not other control chars. Posted to Web page. ----------------------------------------------------------------- v346 11/4/99 Fix bugs in long option processing; R cmd should clear hilites. Posted to Web page. ----------------------------------------------------------------- v347 12/13/99 Fixes for DJGPP version (thanks to Eli Zaretskii). v348 12/28/99 Fix deleting file with marks (thanks to Dimitar Jekov). Fix color problem in DJGPP version (thanks to Eli Zaretskii). v349 1/24/00 Fix minor DJGPP bugs; check environment vars for UTF-8; add --with-editor (thanks to Eli, Markus Kuhn, Thomas Schoepf). v350 3/1/00 Fix clear-while-standout bug. v351 3/5/00 Change -M and = prompts to show top & bottom line number. Posted to Web page. ----------------------------------------------------------------- v352 3/8/00 Fix scan_option NULL dereference. ----------------------------------------------------------------- v353 3/20/00 Fix SECURE compile bug, allow space after numeric option. v354 3/23/00 Add support for PCRE; add --with-regex configure option. ----------------------------------------------------------------- v355 6/28/00 Add -# option (thanks to Andy Levinson). v356 7/5/00 Add -J option. v357 7/6/00 Support sigprocmask. ----------------------------------------------------------------- v358 7/8/00 Fix problems with #stop in lesskey file. Posted to Web page. ----------------------------------------------------------------- v359 9/10/00 Fixes for Win32 display problems (thanks to Maurizio Vairani). v360 1/17/01 Move sysless to etc. v361 12/4/01 Add IBM-1047 charset & EBCDIC fixes (thanks to Thomas Dorner). Fix 32 bit dependencies (thanks to Paul Eggert). Fix UTF-8 overstriking (thanks to Robert Brady). v362 12/4/01 Make status column show search targets. v363 12/6/01 Add --no-keypad option. Add variable width tabstops (thanks to Peter Samuelson). v364 12/10/01 Better handling of very long lines in input; Fix horizontal shifting of colored text. v365 12/11/01 Fix overstriking of tabs; Add support for global(1) and multiple tag matches (thanks to Shigio Yamaguchi and Tim Vanderhoek). v366 12/11/01 Fixes for OS/2 (thanks to Kyosuke Tokoro). v367 12/13/01 Allow -D and -x options to terminate without dollar sign; Right/left arrow when entering N are shift cmds, not line edit. v368 12/18/01 Update lesskey commands. v370 12/23/01 Fix tags error messages. Posted to Web page. ----------------------------------------------------------------- v371 12/26/01 Fix new_file bug; use popen in Windows version; fix some compiler warnings. v372 12/29/01 Make -b be in units of 1K. v373 1/14/02 Improve handling of filenames containing shell metachars. v374 2/7/02 Fix memory leak; fix bug in -x argument parsing. v375 4/7/02 Fix searching for SGR sequences; fix SECURE build; add SGR support to DJGPP version (thanks to Eli Zaretskii). v376 6/10/02 Fix bug in overstriking mulitbyte UTF-8 characters (thanks to Jungshik Shin). Posted to Web page. ----------------------------------------------------------------- v377 9/10/02 Fix bug in Windows version when file contains CR; fix bug in search highlights with -R; make initial buffer limit really be 64K not unlimited. v378 9/30/02 Misc bug fixes and compiler warning cleanup. Posted to Web page. ----------------------------------------------------------------- v379 11/23/02 Add -L option; fix bug with ctrl-K in lesskey files; improve UTF-8 overstriking and underscore overstriking; fix minor man page problems; change to autoconf 2.54. v380 11/24/02 Make LINENUM same as POSITION. v381 11/28/02 Make -N use 7 columns for line number if possible. ----------------------------------------------------------------- v382 2/3/04 Remove copyrighted code. ----------------------------------------------------------------- v383 2/16/04 Add history file; add -K option; improve UTF-8 handling; fix some signed char bugs (thanks to Christian Biere); fix some upper/lower case bugs (thanks to Bjoern Jacke); add erase2 char (thanks to David Lawrence); add windows charset (thanks to Dimitar Zhekov). v384 2/20/04 Improvements in UTF-8 handling. v385 2/23/04 Fix UTF-8 output bug. ----------------------------------------------------------------- v386 9/13/05 Improvements to UTF-8 shift & color (thanks to Charles Levert); protect against invalid LESSOPEN and LESSCLOSE values. v387 9/14/05 Update Charles Levert's UTF-8 patch. v388 9/14/05 Change history behavior; change most sprintf calls to snprintf. v389 9/14/05 Fix copy & paste with long lines; improve performance of expand_linebuf; fix crash in init_mlist; v390 9/15/05 Show search matches in status column even if -G is set. ----------------------------------------------------------------- v391 9/17/05 Fix bugs. v392 10/14/05 Fix line wrapping bug. v393 10/19/05 Allow multiple attributes per char; fix bold+underline bug (thanks again to Charles Levert). v394 11/8/05 Fix prompt bug; fix compile problem in Windows build. ----------------------------------------------------------------- v395 1/12/07 Update Unicode tables (thanks to Charles Levert); don't chmod if LESSHISTFILE = /dev/null; make -f work for directories; support DESTDIR in Makefile; fix sigset_t detection in configure; make "t" cmd traverse tags in correct order v396 1/13/07 Add compatibility with POSIX more. v397 3/21/07 Allow decimal point in number for % command; Allow decimal point in number for -j option; Allow n command to fetch last search pattern from history (thanks to arno). v398 3/22/07 Don't rewrite history file if not necessary; fix bug when filenames contain "$". v399 3/22/07 Don't move to bottom of screen at startup; don't output extraneous newlines. v400 3/23/07 Allow search to find pattern after null byte (PCRE and no-regex) (thanks to Michael Constant). ----------------------------------------------------------------- v401 3/24/07 Minor documentation fixes. v402 3/30/07 Fix autoconf bug when memcpy etc are inline; fix bug in terminating number following -j option. v403 5/25/07 Fix Windows build. v404 6/5/07 Fix display bug with F command and long lines. v405 6/17/07 Fix display bug when using -w option. v406 6/17/07 Fix secure build. v407 8/16/07 Fix bugs; support CSI chars. v408 10/1/07 Fix bug in -i with non-ASCII chars. v409 10/12/07 Fix crash when viewing text with invalid UTF-8 sequences. v411 11/6/07 Fix case-insensitive searching with non-ASCII text. v412 11/6/07 Use symbolic SEEK constants. v413 11/6/07 Fix search highlight bug with non-ASCII text. v414 11/6/07 Fix display bug with no-wrap terminals. v415 11/14/07 Add --follow-name option. v416 11/22/07 Fix crash when searching text with invalid UTF-8 sequences. v417 12/31/07 Don't support single-char CSI in UTF-8 mode; fix bug with -R and invalid CSI sequences; fix bug searching text with SGR sequences with -r; emulate SGR sequences in WIN32 build. v418 12/31/07 Clean up. ----------------------------------------------------------------- v419 1/16/08 Make CSI char 0x9B work in UTF-8 mode (thanks to Colin Watson). v420 2/24/08 Add & command; fix -F option; fix '' after G. v421 2/24/08 Ignore filtered lines when searching. v422 3/2/08 Output CR at startup. v423 5/27/08 Clean up. v424 6/16/08 Fix compile bug with pcre; don't filter help file. v425 7/14/08 Fix non-ANSI code in list handling in ch.c. v426 10/27/08 Fix ignaw terminal handling (thanks to Per Hedeland); fix binary file detection in UTF-8 mode. v427 3/16/09 A few Win32 fixes (thanks to Jason Hood). v428 3/30/09 Add "|-" syntax to LESSOPEN. v429 4/10/09 Fix search highlighting bug with underlined text. ----------------------------------------------------------------- v430 4/22/09 Don't pass "-" to non-pipe LESSOPEN unless it starts with "-". v431 4/29/09 Fix highlight bug when match is at end of line. v432 6/27/09 Better fix for highlight bugs; fix new problems with ignaw terminals. v433 6/28/09 Cleanup search code. v434 6/29/09 More cleanup. v435 7/04/09 Fix bugs with non-regex filtering. v436 7/05/09 Fix memory leak. ----------------------------------------------------------------- v437 7/14/09 Fix bug in handling some long option names; make percentage calculation more accurate. v438 12/29/10 Fix bugs with -i/-I and & filtering; exit with status 2 on ctrl-C with -K. v439 12/31/10 Add -A option. v440 1/5/11 Fix bug displaying prompt after = command. v441 1/21/11 Fix semi-infinite loop if no newlines in file; make new -A behavior the default. ----------------------------------------------------------------- v442 3/2/11 Fix search bug. Add ctrl-G line edit command. v443 4/9/11 Fix Windows build. v444 6/8/11 Fix ungetc bug; remove vestiges of obsolete -l option. ----------------------------------------------------------------- v445 10/19/11 Fix hilite bug in backwards scroll with -J. Fix hilite bug with backspaces. Fix bugs handling SGR sequences in Win32 (thanks to Eric Lee). Add support for GNU regex (thanks to Reuben Thomas). v446 5/15/12 Up/down arrows in cmd editing search for matching cmd. v447 5/21/12 Add ESC-F command, two-pipe LESSOPEN syntax. v448 6/15/12 Print name of regex library in version message. v449 6/23/12 Allow config option --with-regex=none. v450 7/4/12 Fix EOF bug with ESC-F. v451 7/20/12 Fix typo. ----------------------------------------------------------------- v452 10/19/12 Fix --with-regex=none, fix "stty 0", fix Win32. Don't quit if errors in cmd line options. v453 10/27/12 Increase buffer sizes. v454 11/5/12 Fix typo. v455 11/5/12 Fix typo. v456 11/8/12 Fix option string incompatibility. v457 12/8/12 Use new option string syntax only after --use-backslash. v458 4/4/13 Fix display bug in using up/down in cmd buffer. ----------------------------------------------------------------- v459 5/6/13 Fix ++ bug. v460 6/19/13 Automate construction of Unicode tables. v461 6/21/13 Collapse multiple CRs before LF. v462 11/26/13 Don't overwrite history file, just append to it. v463 7/13/14 Misc. fixes. v464 7/19/14 Fix bugs & improve performance in & filtering (thanks to John Sullivan). v465 8/9/14 More fixes from John Sullivan. v466 8/23/14 Add colon to LESSANSIMIDCHARS. v467 9/18/14 Misc. fixes. v468 9/18/14 Fix typo v469 10/2/14 Allow extra string in command to append to a multichar cmd without executing it; fix bug using GNU regex. v470 10/5/14 Fix some compiler warnings. v471 12/14/14 Fix unget issues with prompt. Allow disabling history when compiled value of LESSHISTFILE = "-". v473 12/19/14 Fix prompt bug with stdin and -^P in lesskey extra string. v474 1/30/15 Fix bug in backwards search with match on bottom line. Make follow mode reopen file if file shrinks. v475 3/2/15 Fix possible buffer overrun with invalid UTF-8; fix bug when compiled with no regex; fix non-match search. v476 5/3/15 Update man pages. v477 5/19/15 Fix off-by-one in jump_forw_buffered; don't add FAKE_* files to cmd history. v478 5/21/15 Fix nonportable pointer usage in hilite tree. v479 7/6/15 Allow %% escapes in LESSOPEN variable. v480 7/24/15 Fix bug in no-regex searches; support MSVC v1900. v481 8/20/15 Fix broken -g option. ----------------------------------------------------------------- v482 2/25/16 Update Unicode database to "2015-06-16, 20:24:00 GMT [KW]". v483 2/27/16 Regenerate hilite when change search caselessness. (Thanks to Jason Hood) Fix bug when terminal has no "cm". (Thanks to Noel Cragg) v484 9/20/16 Update to Unicode 9.0.0 database. v485 10/21/16 Fix "nothing to search" bug when top/bottom line is empty; Display line numbers in bold. (thanks to Jason Hood); Fix incorrect display when entering double-width chars in search string. v486 10/22/16 New commands ESC-{ and ESC-} to shift to start/end of displayed lines; new option -Da in Windows version to enable SGR mode (thanks to Jason Hood). v487 10/23/16 configure --help formatting. ----------------------------------------------------------------- v488 2/23/17 Fix memory leaks in search (thanks to John Brooks). v489 3/30/17 Make -F not do init/deinit if file fits on one screen (thanks to Jindrich Novy). v490 4/5/17 Switch to ANSI prototypes in funcs.h; remove "register". v491 4/7/17 Fix signed char bug. v492 4/21/17 Handle SIGTERM. v493 6/22/17 Fix bug initializing charset in MSDOS build. v494 6/26/17 Update Unicode tables; make Cf chars composing not binary. v495 7/3/17 Improve binary file detection (thanks to Bela Lubkin); do -R filter when matching tags (thanks to Matthew Malcomson). v496 7/5/17 Add LESSRSCROLL marker. v497 7/5/17 Sync. v498 7/7/17 Fix early truncation of text if last char is double-width. v499 7/10/17 Misc fixes. v500 7/11/17 Fix bug where certain env variables couldn't be set in lesskey. v501 7/12/17 Make sure rscroll char is standout by default. v502 7/13/17 Control rscroll char via command line option not env variable. v503 7/13/17 Switch to git. v504 7/13/17 Call opt_rscroll at startup; change mkhelp.c to mkhelp.pl. v505 7/17/17 Add M and ESC-M commands; fix buffer handling with stdin and LESSOPEN. v506 7/17/17 On Windows, convert UTF-8 to multibyte if console is not UTF-8; handle extended chars on input (thanks to Jason Hood). v507 7/18/17 Fix some bugs handling filenames containing shell metachars. v508 7/19/17 Fix bugs when using LESSOPEN to read stdin. v509 7/19/17 Fix another stdin bug. v510 7/20/17 Fix bug in determining when to reopen a file. v511 7/25/17 Fix bugs in recent MSDOS changes (thanks to Jason Hood). v512 7/26/17 Fix MSDOS build. v513 7/26/17 Fix switch to normal attr at end of line with -R and rscroll. v514 7/27/17 Fix bug in fcomplete when pattern does not match a file. v515 7/28/17 Allow 'u' in -D option on Windows. v516 7/29/17 Fix bug using LESSOPEN with filename containing metachars. v517 7/30/17 Status column shows matches even if hiliting is disabled via -G. v518 8/1/17 Use underline in sgr mode in MSDOS (thanks to Jason Hood). v519 8/10/17 Fix rscroll bug when last char of line starts coloration. v520 9/3/17 Fix compiler warning. v521 10/20/17 Fix binary file warning in UTF-8 files with SGI sequences. v522 10/20/17 Handle keypad ENTER key properly. v523 10/23/17 Cleanup. v524 10/24/17 Fix getcc bug. v525 10/24/17 Change M command to mark last displayed line. v526 10/25/17 Fix search hilite bug introduced in v517. v527 10/30/17 Fix search hilite bug on last page with -a. v528 11/3/17 Make second ESC-u clear status column. v529 11/12/17 Display Unicode formatting chars in hex if -U is set. v530 12/2/17 Minor doc change and add missing VOID_PARAM. ----------------------------------------------------------------- v531 5/13/18 Fix bug with v on empty file; fix bug with v on file with metachars in name; add --nohistdups option. v532 7/27/18 Redraw screen on SIGWINCH even if screen size doesn't change. v533 8/1/18 Shell escape filenames in history; use PCRE_UTF8 flag; use wide-chars for Windows console title (thanks to Jason Hood). v534 8/9/18 Support PCRE2. v535 8/16/18 Don't count lines of initial screen if using -X with -F (thanks to Linus Torvalds). v536 8/31/18 Use descriptive error messages for PCRE2. v537 8/31/18 Support mingw build system (thanks to Mike Soyka). v538 9/3/18 Clean up some WIN32 code. v539 9/13/18 Fix spurious input on Windows with CAPSLOCK. v540 10/29/18 Add --mouse option. v541 10/30/18 Add --MOUSE option. v542 11/6/18 Add mouse support for WIN32; add --wheel-lines option. (thanks to Jason Hood). v543 11/12/18 Code cleanup. v544 11/16/18 Don't init/deinit keyboard/mouse if quit due to -F. v545 11/22/18 Fix Windows build, memory leaks. v546 11/29/18 Add --save-marks option. v547 11/30/18 Fix some bugs with saved marks. v548 12/14/18 Ignore mouse input when line editing. v549 2/10/19 Support X11 mouse extension 1006; Win32 fixes (thanks to Jason Hood). v550 2/16/19 Fix Win32 build; don't enable mouse unless --mouse is set. v551 6/10/19 Doc changes. ----------------------------------------------------------------- v552 7/8/19 Update Unicode tables. v553 10/17/19 Support tinfow; handle zero-width Hangul chars. v554 1/19/20 Remove erroneous free(). v555 3/15/20 Display error msg immediately when toggle -o without stdin. v556 3/15/20 Update copyright. v557 3/21/20 Fix memory corruption with libtermcap. v558 4/17/20 Don't init terminal if -F and file fits on one screen (WIN32). v559 4/19/20 Handle deinit correctly on WIN32. v560 5/3/20 Fix regression when command results in no movement; fix some less.nro issues (thanks to Bjarni I. Gislason). v561 5/11/20 Fix erroneous EOF calculation when F command is interrupted. v562 5/19/20 Update Unicode tables; minor doc formatting. v563 6/13/20 Fix crash due to realpath() incompatibility. v564 8/25/20 Handle realpath consistently; update docs. v565 11/3/20 Add ESC-U command, optimize calls to realpath(). v566 11/25/20 Fix crash when reopening a file while using LESSOPEN; support OSC 8 hyperlinks. v567 11/25/20 Fix typo. v568 11/29/20 Fix some hyperlink bugs; add ^W search modifier (thanks to Arminius); allow Makefile.aut to use Python instead of Perl (thanks to Charlie Lin). v569 12/1/20 Allow multiple & filters (thanks to Mattias Johansson), allow ^X to exit F command. v570 12/12/20 Better handling of multiple + or -p options; fix bugs in horizontal scrolling. v571 12/30/20 Add --line-num-width and --status-col-width options. v572 1/4/21 Save lastmark in history file; don't toggle mouse reporting; implement termcap delays. v573 1/9/21 Limit eof bell to 1 per second. v574 1/13/21 Add incremental search. v575 1/17/21 Fix build without HILITE_SEARCH; fix bug with ^K in lesskey extra string. v576 2/4/21 Make sure search result is visible; add --use-color and --color. v577 2/9/21 Use ttyname to get name of tty device. v578 2/9/21 Doc v579 2/14/21 Fix double-width char bugs and non-match search crash. v580 3/2/21 Some color fixes; fix compiler warnings; some lesstest support. v581 4/6/21 Ignore SIGTSTP in secure mode; don't print "skipping" when filtering. v582 4/21/21 Less now reads lesskey source file rather than binary; fix bug in finding tags with backslashes. v583 4/21/21 Use XDG_CONFIG_HOME and XDG_DATA_HOME to find files. v584 4/30/21 Add --file-size option. v585 5/2/21 Allow color desc W per man page. v586 5/7/21 Doc changes. v587 5/27/21 Fix --with-secure; fix --file-size message on Windows; fix colored search hilite in colored text; don't exit if -F and screen is resized; fix memcpy usage. v588 5/27/21 Fix release. v589 5/29/21 Copyright & build changes. v590 6/3/21 Fix non-autoconf Makefiles. v591 8/8/21 Use \kB for backspace key in lesskey; add more \k codes; handle multibyte chars in prompt. v592 8/24/21 Add --status-line option; limit use of /proc kludge; add --header. v593 8/30/21 Add header columns, --no-number-headers. v594 10/1/21 Let regex library handle caseless; add --redraw-on-quit option; add #version to lesskey. v595 10/12/21 Add H color type; add += to lesskey var section; add --search-options. v596 11/8/21 Look for lesskey in $HOME/.config. v597 11/16/21 Fix bugs in --header. v598 12/6/21 Look for lesshst in $XDG_STATE_HOME and $HOME/.local/state. v599 12/28/21 Defer moving to lower left in some cases; suppress TAB expansion in some cases. v600 1/7/22 Use /dev/tty if cannot open ttyname(). v601 1/31/22 Add --exit-follow-on-close option. v602 3/1/22 Doc changes. v603 3/14/22 Fix --header. v604 5/14/22 Fix termlib detection; fix non-ASCII input on Windows. v605 6/14/22 Update version number. v606 7/17/22 Fix bug with multibyte chars and --incsearch; escape filenames in LESSCLOSE; fix bin_file overrun. v607 7/19/22 Update Unicode tables. v608 7/22/22 Fix highlighting on colored text boundaries. v609 11/10/22 Add LESSUTFCHARDEF; fix overstrike color bug; fix procfs bug; fix signal race. v610 11/14/22 Update Unicode tables; fix again-search after filter; improve ^X to interrupt F command. v611 11/16/22 Fix EOF bug related to ^X change. v612 11/18/22 Fix more bugs related to ^X change. v613 11/28/22 Even more ^X issues. v614 11/28/22 Add ^X to wait message. v615 11/30/22 Add --no-vbell option. v616 12/9/22 Don't open tty as input file without -f. v617 12/10/22 Support poll on newer versions of MacOS. v618 12/29/22 Add --no-search-headers option; use C89 function definitions. v619 12/30/22 Fix bug using 'n' before '/'. v620 1/12/23 Add --modelines option; add --intr option; add subpattern coloring. v621 1/15/23 Add --wordwrap option; add LESS_LINES & LESS_COLUMNS. v622 1/27/23 Add --show-preproc-errors option. v623 2/2/23 Add # command; add ^S search modifier. v624 2/11/23 Add --proc-backspace, --proc-tab and --proc-return options. v625 2/16/23 Minor fixes. v626 2/19/23 Fix rare crash in add_attr_normal. v627 2/19/23 Doc. v628 2/20/23 Don't require newline after +&... v629 2/26/23 Delay "waiting for data" message for 500 ms. v630 3/18/23 Add LESS_DATA_DELAY. v631 3/26/23 Fix input of dead keys on Windows. v632 4/6/23 Make lesstest work on MacOS; minor fixes. +v633 5/3/23 Fix build on systems with ncurses/termcap.h or ncursesw/termcap.h. +v634 5/29/23 Allow program piping into less to access tty; + fix search modifier ^E after ^W. +v635 6/2/23 Fix crash with ! search modifier. +v636 6/18/23 Fix -D in MS-DOS build; fix mouse wheel in MS-DOS build. +v637 6/28/23 Fix early EOF when SIGWINCH is received. +v638 6/29/23 Fix compile error with ECHONL. +v639 6/29/23 Fix SIGWINCH while reading tty. +v640 7/10/23 Add lesstest to release. +v641 7/10/23 Fix release. +v642 7/10/23 Fix release. +v643 7/20/23 Fix crash on Windows with -o. */ -char version[] = "632"; +char version[] = "643"; diff --git a/contrib/less/xbuf.c b/contrib/less/xbuf.c index 1ed369e175f2..92076764d314 100644 --- a/contrib/less/xbuf.c +++ b/contrib/less/xbuf.c @@ -1,163 +1,163 @@ #include "less.h" #include "xbuf.h" /* * Initialize an expandable text buffer. */ public void xbuf_init(struct xbuffer *xbuf) { xbuf->data = NULL; xbuf->size = xbuf->end = 0; } public void xbuf_deinit(struct xbuffer *xbuf) { if (xbuf->data != NULL) free(xbuf->data); xbuf_init(xbuf); } public void xbuf_reset(struct xbuffer *xbuf) { xbuf->end = 0; } /* * Add a byte to an expandable text buffer. */ public void xbuf_add_byte(struct xbuffer *xbuf, unsigned char b) { if (xbuf->end >= xbuf->size) { unsigned char *data; if (ckd_add(&xbuf->size, xbuf->size, xbuf->size ? xbuf->size : 16)) out_of_memory(); data = (unsigned char *) ecalloc(xbuf->size, sizeof(unsigned char)); if (xbuf->data != NULL) { memcpy(data, xbuf->data, xbuf->end); free(xbuf->data); } xbuf->data = data; } xbuf->data[xbuf->end++] = (unsigned char) b; } public void xbuf_add_data(struct xbuffer *xbuf, unsigned char *data, int len) { int i; for (i = 0; i < len; i++) xbuf_add_byte(xbuf, data[i]); } public int xbuf_pop(struct xbuffer *buf) { if (buf->end == 0) return -1; return (int) buf->data[--(buf->end)]; } public void xbuf_set(struct xbuffer *dst, struct xbuffer *src) { xbuf_reset(dst); xbuf_add_data(dst, src->data, src->end); } public char * xbuf_char_data(struct xbuffer *xbuf) { return (char *)(xbuf->data); } /* * Helper functions for the ckd_add and ckd_mul macro substitutes. * These helper functions do not set *R on overflow, and assume that * arguments are nonnegative, that INTMAX_MAX <= UINTMAX_MAX, and that * sizeof is a reliable way to distinguish integer representations. * Despite these limitations they are good enough for 'less' on all * known practical platforms. For more-complicated substitutes * without most of these limitations, see Gnulib's stdckdint module. */ #if !HAVE_STDCKDINT_H /* * If the integer *R can represent VAL, store the value and return FALSE. * Otherwise, possibly set *R to an indeterminate value and return TRUE. * R has size RSIZE, and is signed if and only if RSIGNED is nonzero. */ static int help_fixup(void *r, uintmax val, int rsize, int rsigned) { if (rsigned) { if (rsize == sizeof (int)) { int *pr = r; if (INT_MAX < val) return TRUE; - *pr = val; + *pr = (int) val; #ifdef LLONG_MAX } else if (rsize == sizeof (long long)) { long long *pr = r; if (LLONG_MAX < val) return TRUE; *pr = val; #endif #ifdef INTMAX_MAX } else if (rsize == sizeof (intmax_t)) { intmax_t *pr = r; if (INTMAX_MAX < val) return TRUE; *pr = val; #endif } else /* rsize == sizeof (long) */ { long *pr = r; if (LONG_MAX < val) return TRUE; - *pr = val; + *pr = (long) val; } } else { if (rsize == sizeof (unsigned)) { unsigned *pr = r; if (UINT_MAX < val) return TRUE; - *pr = val; + *pr = (unsigned) val; } else if (rsize == sizeof (unsigned long)) { unsigned long *pr = r; if (ULONG_MAX < val) return TRUE; - *pr = val; + *pr = (unsigned long) val; #ifdef ULLONG_MAX } else if (rsize == sizeof (unsigned long long)) { long long *pr = r; if (ULLONG_MAX < val) return TRUE; *pr = val; #endif } else /* rsize == sizeof (uintmax) */ { uintmax *pr = r; *pr = val; } } return FALSE; } /* * If *R can represent the mathematical sum of A and B, store the sum * and return FALSE. Otherwise, possibly set *R to an indeterminate * value and return TRUE. R has size RSIZE, and is signed if and only * if RSIGNED is nonzero. */ public int help_ckd_add(void *r, uintmax a, uintmax b, int rsize, int rsigned) { uintmax sum = a + b; return sum < a || help_fixup(r, sum, rsize, rsigned); } /* Likewise, but for the product of A and B. */ public int help_ckd_mul(void *r, uintmax a, uintmax b, int rsize, int rsigned) { uintmax product = a * b; return ((b != 0 && a != product / b) || help_fixup(r, product, rsize, rsigned)); } #endif diff --git a/usr.bin/less/defines.h b/usr.bin/less/defines.h index e6087d63f3eb..018d98a48162 100644 --- a/usr.bin/less/defines.h +++ b/usr.bin/less/defines.h @@ -1,475 +1,475 @@ /* defines.h. Generated from defines.h.in by configure. */ /* defines.h.in. Generated from configure.ac by autoheader. */ /* Unix definition file for less. -*- C -*- * * This file has 3 sections: * User preferences. * Settings always true on Unix. * Settings automatically determined by configure. * * * * * * * WARNING * * * * * * * If you edit defines.h by hand, do "touch stamp-h" before you run make * so config.status doesn't overwrite your changes. */ /* User preferences. */ /* * SECURE is 1 if you wish to disable a bunch of features in order to * be safe to run by unprivileged users. * SECURE_COMPILE is set by the --with-secure configure option. */ #define SECURE SECURE_COMPILE /* * SHELL_ESCAPE is 1 if you wish to allow shell escapes. * (This is possible only if your system supplies the system() function.) */ #define SHELL_ESCAPE (!SECURE) /* * EXAMINE is 1 if you wish to allow examining files by name from within less. */ #define EXAMINE (!SECURE) /* * TAB_COMPLETE_FILENAME is 1 if you wish to allow the TAB key * to complete filenames at prompts. */ #define TAB_COMPLETE_FILENAME (!SECURE) /* * CMD_HISTORY is 1 if you wish to allow keys to cycle through * previous commands at prompts. */ #define CMD_HISTORY 1 /* * HILITE_SEARCH is 1 if you wish to have search targets to be * displayed in standout mode. */ #define HILITE_SEARCH 1 /* * EDITOR is 1 if you wish to allow editor invocation (the "v" command). * (This is possible only if your system supplies the system() function.) * EDIT_PGM is the name of the (default) editor to be invoked. */ #define EDITOR (!SECURE) /* * TAGS is 1 if you wish to support tag files. */ #define TAGS (!SECURE) /* * USERFILE is 1 if you wish to allow a .less file to specify * user-defined key bindings. */ #define USERFILE (!SECURE) /* * GLOB is 1 if you wish to have shell metacharacters expanded in filenames. * This will generally work if your system provides the "popen" function * and the "echo" shell command. */ #define GLOB (!SECURE) /* * PIPEC is 1 if you wish to have the "|" command * which allows the user to pipe data into a shell command. */ #define PIPEC (!SECURE && HAVE_POPEN) /* * LOGFILE is 1 if you wish to allow the -o option (to create log files). */ #define LOGFILE (!SECURE) /* * GNU_OPTIONS is 1 if you wish to support the GNU-style command * line options --help and --version. */ #define GNU_OPTIONS 1 /* * ONLY_RETURN is 1 if you want RETURN to be the only input which * will continue past an error message. * Otherwise, any key will continue past an error message. */ #define ONLY_RETURN 0 /* * LESSKEYFILE is the filename of the default lesskey output file * (in the HOME directory). * LESSKEYFILE_SYS is the filename of the system-wide lesskey output file. * DEF_LESSKEYINFILE is the filename of the default lesskey input * (in the HOME directory). * LESSHISTFILE is the filename of the history file * (in the HOME directory). */ #define LESSKEYFILE ".less" #define LESSKEYFILE_SYS "/etc/lesskey" #define DEF_LESSKEYINFILE ".lesskey" #define LESSKEYINFILE_SYS "/etc/syslesskey" #define LESSHISTFILE ".lesshst" /* Settings always true on Unix. */ /* * Define MSDOS_COMPILER if compiling under Microsoft C. */ #define MSDOS_COMPILER 0 /* * Pathname separator character. */ #define PATHNAME_SEP "/" /* * The value returned from tgetent on success. * Some HP-UX systems return 0 on success. */ #define TGETENT_OK 1 /* * HAVE_ANSI_PROTOS is 1 if your compiler supports ANSI function prototypes. */ #define HAVE_ANSI_PROTOS 1 /* * HAVE_SYS_TYPES_H is 1 if your system has . */ #define HAVE_SYS_TYPES_H 1 /* * Define if you have the header file. */ /* #undef HAVE_SGSTAT_H */ /* * HAVE_PERROR is 1 if your system has the perror() call. * (Actually, if it has sys_errlist, sys_nerr and errno.) */ #define HAVE_PERROR 1 /* * HAVE_TIME is 1 if your system has the time() call. */ #define HAVE_TIME 1 /* * HAVE_SHELL is 1 if your system supports a SHELL command interpreter. */ #define HAVE_SHELL 1 /* * Default shell metacharacters and meta-escape character. */ #define DEF_METACHARS "; *?\t\n'\"()<>[]|&^`#\\$%=~{}," #define DEF_METAESCAPE "\\" /* * HAVE_DUP is 1 if your system has the dup() call. */ #define HAVE_DUP 1 /* Define to 1 if you have the memcpy() function. */ #define HAVE_MEMCPY 1 /* Define to 1 if you have the strchr() function. */ #define HAVE_STRCHR 1 /* Define to 1 if you have the strstr() function. */ #define HAVE_STRSTR 1 /* Define to 1 to support reading lesskey source files (not just binary). */ #define HAVE_LESSKEYSRC 1 /* * Sizes of various buffers. */ #if 0 /* old sizes for small memory machines */ #define CMDBUF_SIZE 512 /* Buffer for multichar commands */ #define UNGOT_SIZE 100 /* Max chars to unget() */ #define LINEBUF_SIZE 1024 /* Max size of line in input file */ #define OUTBUF_SIZE 1024 /* Output buffer */ #define PROMPT_SIZE 200 /* Max size of prompt string */ #define TERMBUF_SIZE 2048 /* Termcap buffer for tgetent */ #define TERMSBUF_SIZE 1024 /* Buffer to hold termcap strings */ #define TAGLINE_SIZE 512 /* Max size of line in tags file */ #define TABSTOP_MAX 32 /* Max number of custom tab stops */ #else /* more reasonable sizes for modern machines */ #define CMDBUF_SIZE 2048 /* Buffer for multichar commands */ #define UNGOT_SIZE 200 /* Max chars to unget() */ #define LINEBUF_SIZE 1024 /* Initial max size of line in input file */ #define OUTBUF_SIZE 1024 /* Output buffer */ #define PROMPT_SIZE 2048 /* Max size of prompt string */ #define TERMBUF_SIZE 2048 /* Termcap buffer for tgetent */ #define TERMSBUF_SIZE 1024 /* Buffer to hold termcap strings */ #define TAGLINE_SIZE 1024 /* Max size of line in tags file */ #define TABSTOP_MAX 128 /* Max number of custom tab stops */ #endif /* Define as the return type of signal handlers (int or void). */ #define RETSIGTYPE void /* Settings automatically determined by configure. */ /* Define EDIT_PGM to your editor. */ #define EDIT_PGM "vi" /* Define HAVE_CONST if your compiler supports the "const" modifier. */ #define HAVE_CONST 1 /* Define to 1 if you have the header file. */ #define HAVE_CTYPE_H 1 /* Define HAVE_ERRNO if you have the errno variable. */ #define HAVE_ERRNO 1 /* Define to 1 if you have the header file. */ #define HAVE_ERRNO_H 1 /* Define to 1 if you have the `fchmod' function. */ #define HAVE_FCHMOD 1 /* Define to 1 if you have the header file. */ #define HAVE_FCNTL_H 1 /* Define HAVE_FILENO if you have the fileno() macro. */ #define HAVE_FILENO 1 /* Define to 1 if you have the `fsync' function. */ #define HAVE_FSYNC 1 /* GNU regex library */ /* #undef HAVE_GNU_REGEX */ /* Define to 1 if you have the header file. */ #define HAVE_INTTYPES_H 1 /* Define to 1 if you have the header file. */ #define HAVE_LIMITS_H 1 /* Define to 1 if you have the header file. */ /* #undef HAVE_LINUX_MAGIC_H */ /* Define HAVE_LOCALE if you have locale.h and setlocale. */ #define HAVE_LOCALE 1 -/* Define to 1 if you have the header file. */ -#define HAVE_MEMORY_H 1 - /* Define to 1 if you have the `nanosleep' function. */ #define HAVE_NANOSLEEP 1 +/* Define to 1 if you have the header file. */ +/* #undef HAVE_NCURSESW_TERMCAP_H */ + +/* Define to 1 if you have the header file. */ +/* #undef HAVE_NCURSES_TERMCAP_H */ + /* Define HAVE_OSPEED if your termcap library has the ospeed variable. */ #define HAVE_OSPEED 1 /* PCRE (Perl-compatible regular expression) library */ /* #undef HAVE_PCRE */ /* PCRE2 (Perl-compatible regular expression) library */ /* #undef HAVE_PCRE2 */ /* Define to 1 if you have the `poll' function. */ #define HAVE_POLL 1 /* Define to 1 if you have the `popen' function. */ #define HAVE_POPEN 1 /* POSIX regcomp() and regex.h */ #define HAVE_POSIX_REGCOMP 1 /* Define HAVE_PROCFS if have have fstatfs with f_type and PROC_SUPER_MAGIC. */ /* #undef HAVE_PROCFS */ /* Define to 1 if you have the `realpath' function. */ #define HAVE_REALPATH 1 /* System V regcmp() */ /* #undef HAVE_REGCMP */ /* */ /* #undef HAVE_REGEXEC2 */ /* BSD re_comp() */ /* #undef HAVE_RE_COMP */ /* Define HAVE_SIGEMPTYSET if you have the sigemptyset macro. */ #define HAVE_SIGEMPTYSET 1 /* Define to 1 if you have the `sigprocmask' function. */ #define HAVE_SIGPROCMASK 1 /* Define to 1 if you have the `sigsetmask' function. */ #define HAVE_SIGSETMASK 1 /* Define to 1 if the system has the type `sigset_t'. */ #define HAVE_SIGSET_T 1 /* Define to 1 if you have the `snprintf' function. */ #define HAVE_SNPRINTF 1 /* Define to 1 if you have the `stat' function. */ #define HAVE_STAT 1 /* Define HAVE_STAT_INO if your struct stat has st_ino and st_dev. */ #define HAVE_STAT_INO 1 /* Define to 1 if you have the header file. */ /* #undef HAVE_STDCKDINT_H */ /* Define to 1 if you have the header file. */ #define HAVE_STDINT_H 1 /* Define to 1 if you have the header file. */ #define HAVE_STDIO_H 1 /* Define to 1 if you have the header file. */ #define HAVE_STDLIB_H 1 /* Define HAVE_STRERROR if you have the strerror() function. */ #define HAVE_STRERROR 1 /* Define to 1 if you have the header file. */ #define HAVE_STRINGS_H 1 /* Define to 1 if you have the header file. */ #define HAVE_STRING_H 1 /* Define to 1 if you have the `strsignal' function. */ #define HAVE_STRSIGNAL 1 /* Define to 1 if you have the `system' function. */ #define HAVE_SYSTEM 1 /* Define HAVE_SYS_ERRLIST if you have the sys_errlist[] variable. */ #define HAVE_SYS_ERRLIST 1 /* Define to 1 if you have the header file. */ #define HAVE_SYS_IOCTL_H 1 /* Define to 1 if you have the header file. */ #define HAVE_SYS_STAT_H 1 /* Define to 1 if you have the header file. */ /* #undef HAVE_SYS_STREAM_H */ /* Define to 1 if you have the header file. */ #define HAVE_SYS_TYPES_H 1 /* Define to 1 if you have the header file. */ #define HAVE_SYS_WAIT_H 1 /* Define to 1 if you have the header file. */ #define HAVE_TERMCAP_H 1 /* Define HAVE_TERMIOS_FUNCS if you have tcgetattr/tcsetattr. */ #define HAVE_TERMIOS_FUNCS 1 /* Define to 1 if you have the header file. */ #define HAVE_TERMIOS_H 1 /* Define to 1 if you have the header file. */ /* #undef HAVE_TERMIO_H */ /* Define to 1 if you have the header file. */ #define HAVE_TIME_H 1 /* Define HAVE_TIME_T if your system supports the "time_t" type. */ #define HAVE_TIME_T 1 /* Define to 1 if you have the `ttyname' function. */ #define HAVE_TTYNAME 1 /* Define to 1 if you have the header file. */ #define HAVE_UNISTD_H 1 /* Define HAVE_UPPER_LOWER if you have isupper, islower, toupper, tolower. */ #define HAVE_UPPER_LOWER 1 /* Define to 1 if you have the `usleep' function. */ #define HAVE_USLEEP 1 /* Henry Spencer V8 regcomp() and regexp.h */ /* #undef HAVE_V8_REGCOMP */ /* Define to 1 if you have the header file. */ /* #undef HAVE_VALUES_H */ /* Define HAVE_VOID if your compiler supports the "void" type. */ #define HAVE_VOID 1 /* Define HAVE_WCTYPE if you have iswupper, iswlower, towupper, towlower. */ #define HAVE_WCTYPE 1 /* Define to 1 if you have the header file. */ #define HAVE_WCTYPE_H 1 /* Define to 1 if you have the `_setjmp' function. */ #define HAVE__SETJMP 1 /* Define MUST_DEFINE_ERRNO if you have errno but it is not define in errno.h. */ /* #undef MUST_DEFINE_ERRNO */ /* Define MUST_DEFINE_OSPEED if you have ospeed but it is not defined in termcap.h. */ /* #undef MUST_DEFINE_OSPEED */ /* pattern matching is supported, but without metacharacters. */ /* #undef NO_REGEX */ /* Define to the address where bug reports for this package should be sent. */ #define PACKAGE_BUGREPORT "" /* Define to the full name of this package. */ #define PACKAGE_NAME "less" /* Define to the full name and version of this package. */ #define PACKAGE_STRING "less 1" /* Define to the one symbol short name of this package. */ #define PACKAGE_TARNAME "less" /* Define to the home page for this package. */ #define PACKAGE_URL "" /* Define to the version of this package. */ #define PACKAGE_VERSION "1" /* Define SECURE_COMPILE=1 to build a secure version of less. */ #define SECURE_COMPILE 0 /* Define to 1 if the `S_IS*' macros in do not work properly. */ /* #undef STAT_MACROS_BROKEN */ -/* Define to 1 if you have the ANSI C header files. */ +/* Define to 1 if all of the C90 standard headers exist (not just the ones + required in a freestanding environment). This macro is provided for + backward compatibility; new code need not use it. */ #define STDC_HEADERS 1 -/* Enable large inode numbers on Mac OS X 10.5. */ -#ifndef _DARWIN_USE_64_BIT_INODE -# define _DARWIN_USE_64_BIT_INODE 1 -#endif - /* Number of bits in a file offset, on hosts where this is settable. */ /* #undef _FILE_OFFSET_BITS */ /* Define for large files, on AIX-style hosts. */ /* #undef _LARGE_FILES */ /* Define to empty if `const' does not conform to ANSI C. */ /* #undef const */ /* Define to `long int' if does not define. */ /* #undef off_t */ /* Define to `unsigned int' if does not define. */ /* #undef size_t */