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 .\"	@(#)indent.1	8.1 (Berkeley) 7/1/93
 .\" $FreeBSD$
 .\"
 .Dd December 2, 2016
 .Dt INDENT 1
 .Os
 .Sh NAME
 .Nm indent
 .Nd indent and format C program source
 .Sh SYNOPSIS
 .Nm
 .Op Ar input-file Op Ar output-file
 .Op Fl bacc | Fl nbacc
 .Op Fl bad | Fl nbad
 .Op Fl badp | Fl nbadp
 .Op Fl bap | Fl nbap
 .Bk -words
 .Op Fl ei | Fl ei
 .Op Fl eei | Fl eei
 .Op Fl bbb | Fl nbbb
 .Ek
 .Op Fl \&bc | Fl nbc
 .Op Fl \&bl
 .Op Fl \&br
 .Op Fl bs | Fl nbs
 .Op Fl c Ns Ar n
 .Op Fl \&cd Ns Ar n
 .Bk -words
 .Op Fl cdb | Fl ncdb
 .Ek
 .Op Fl \&ce | Fl nce
 .Op Fl \&ci Ns Ar n
 .Op Fl cli Ns Ar n
 .Op Fl d Ns Ar n
 .Op Fl \&di Ns Ar n
 .Bk -words
 .Op Fl fbs | Fl nfbs
 .Op Fl fc1 | Fl nfc1
 .Op Fl fcb | Fl nfcb
 .Ek
 .Op Fl i Ns Ar n
 .Op Fl \&ip | Fl nip
 .Op Fl l Ns Ar n
 .Op Fl \&lc Ns Ar n
 .Op Fl \&ldi Ns Ar n
 .Op Fl \&lp | Fl nlp
 .Op Fl npro
 .Op Fl pcs | Fl npcs
 .Op Fl psl | Fl npsl
 .Op Fl sac | Fl nsac
 .Op Fl \&sc | Fl nsc
 .Bk -words
 .Op Fl sob | Fl nsob
 .Ek
 .Op Fl \&st
 .Op Fl \&ta
 .Op Fl troff
 .Op Fl U Ns Ar file
 .Op Fl ut | Fl nut
 .Op Fl v | Fl \&nv
 .Sh DESCRIPTION
 The
 .Nm
 utility is a
 .Em C
 program formatter.
 It reformats the
 .Em C
 program in the
 .Ar input-file
 according to the switches.
 The switches which can be
 specified are described below.
 They may appear before or after the file
 names.
 .Pp
 .Sy NOTE :
 If you only specify an
 .Ar input-file ,
 the formatting is
 done `in-place', that is, the formatted file is written back into
 .Ar input-file
 and a backup copy of
 .Ar input-file
 is written in the current directory.
 If
 .Ar input-file
 is named
 .Sq Pa /blah/blah/file ,
 the backup file is named
 .Sq Pa file.BAK .
 .Pp
 If
 .Ar output-file
 is specified,
 .Nm
 checks to make sure that it is different from
 .Ar input-file .
 .Pp
 The options listed below control the formatting style imposed by
 .Nm .
 .Bl -tag -width Op
 .It Fl bacc , nbacc
 If
 .Fl bacc
 is specified, a blank line is forced around every conditional
 compilation block.
 For example, in front of every #ifdef and after every #endif.
 Other blank lines surrounding such blocks will be swallowed.
 Default:
 .Fl nbacc  .
 .It Fl bad , nbad
 If
 .Fl bad
 is specified, a blank line is forced after every block of
 declarations.
 Default:
 .Fl nbad .
 .It Fl badp , nbadp
 This is vaguely similar to
 .Fl bad
-, except that it only applies to the first set of declarations
+except that it only applies to the first set of declarations
 in a procedure (just after the first `{') and it causes a blank
 line to be generated even if there are no declarations.
 The default is
 .Fl nbadp.
 .It Fl bap , nbap
 If
 .Fl bap
 is specified, a blank line is forced after every procedure body.
 Default:
 .Fl nbap .
 .It Fl bbb , nbbb
 If
 .Fl bbb
 is specified, a blank line is forced before every block comment.
 Default:
 .Fl nbbb .
 .It Fl \&bc , nbc
 If
 .Fl \&bc
 is specified, then a newline is forced after each comma in a declaration.
 .Fl nbc
 turns off this option.
 Default:
 .Fl \&nbc .
 .It Fl \&br , \&bl
 Specifying
 .Fl \&bl
 lines-up compound statements like this:
 .Bd -literal -offset indent
 if (...)
 {
   code
 }
 .Ed
 .Pp
 Specifying
 .Fl \&br
 (the default) makes them look like this:
 .Bd -literal -offset indent
 if (...) {
   code
 }
 .Ed
 .It Fl bs , nbs
 Whether a blank should always be inserted after sizeof.
 The default is
 .Fl nbs.
 .It Fl c Ns Ar n
 The column in which comments on code start.
 The default is 33.
 .It Fl cd Ns Ar n
 The column in which comments on declarations start.
 The default
 is for these comments to start in the same column as those on code.
 .It Fl cdb , ncdb
 Enables (disables) the placement of comment delimiters on blank lines.
 With
 this option enabled, comments look like this:
 .Bd -literal -offset indent
 	/*
 	 * this is a comment
 	 */
 .Ed
 .Pp
 Rather than like this:
 .Bd -literal -offset indent
 	/* this is a comment */
 .Ed
 .Pp
 This only affects block comments, not comments to the right of
 code.
 The default is
 .Fl cdb .
 .It Fl ce , nce
 Enables (disables) forcing of `else's to cuddle up to the immediately preceding
 `}'.
 The default is
 .Fl \&ce .
 .It Fl \&ci Ns Ar n
 Sets the continuation indent to be
 .Ar n .
 Continuation
 lines will be indented that far from the beginning of the first line of the
 statement.
 Parenthesized expressions have extra indentation added to
 indicate the nesting, unless
 .Fl \&lp
 is in effect
 or the continuation indent is exactly half of the main indent.
 .Fl \&ci
 defaults to the same value as
 .Fl i .
 .It Fl cli Ns Ar n
 Causes case labels to be indented
 .Ar n
 tab stops to the right of the containing
 .Ic switch
 statement.
 .Fl cli0.5
 causes case labels to be indented half a tab stop.
 The
 default is
 .Fl cli0 .
 .It Fl d Ns Ar n
 Controls the placement of comments which are not to the
 right of code.
 For example,
 .Fl \&d\&1
 means that such comments are placed one indentation level to the
 left of code.
 Specifying the default
 .Fl \&d\&0
 lines-up these comments with the code.
 See the section on comment
 indentation below.
 .It Fl \&di Ns Ar n
 Specifies the indentation, in character positions,
 of global variable names and all struct/union member names
 relative to the beginning of their type declaration.
 The default is
 .Fl di16 .
 .It Fl dj , ndj
 .Fl \&dj
 left justifies declarations.
 .Fl ndj
 indents declarations the same as code.
 The default is
 .Fl ndj .
 .It Fl \&ei , nei
 Enables (disables) special
 .Ic else-if
 processing.
 If it is enabled, an
 .Ic if
 following an
 .Ic else
 will have the same indentation as the preceding
 .Ic \&if
 statement.
 The default is
 .Fl ei .
 .It Fl eei , neei
 Enables (disables) extra indentation on continuation lines of
 the expression part of
 .Ic if
 and
 .Ic while
 statements.
 These continuation lines will be indented one extra level.
 The default is
 .Fl neei .
 .It Fl fbs , nfbs
 Enables (disables) splitting the function declaration and opening brace
 across two lines.
 The default is
 .Fl fbs .
 .It Fl fc1 , nfc1
 Enables (disables) the formatting of comments that start in column 1.
 Often, comments whose leading `/' is in column 1 have been carefully
 hand formatted by the programmer.
 In such cases,
 .Fl nfc1
 should be
 used.
 The default is
 .Fl fc1 .
 .It Fl fcb , nfcb
 Enables (disables) the formatting of block comments (ones that begin
 with `/*\\n').
 Often, block comments have been not so carefully hand formatted by the
 programmer, but reformatting that would just change the line breaks is not
 wanted.
 In such cases,
 .Fl nfcb
 should be used.
 Block comments are then handled like box comments.
 The default is
 .Fl fcb .
 .It Fl i Ns Ar n
 The number of spaces for one indentation level.
 The default is 8.
 .It Fl \&ip , nip
 Enables (disables) the indentation of parameter declarations from the left
 margin.
 The default is
 .Fl \&ip .
 .It Fl l Ns Ar n
 Maximum length of an output line.
 The default is 78.
 .It Fl lc Ns Ar n
 Maximum length of an output line in a block comment.
 The default is 0, which means to limit block comment lines in accordance with
 .Fl l.
 .It Fl \&ldi Ns Ar n
 Specifies the indentation, in character positions,
 of local variable names
 relative to the beginning of their type declaration.
 The default is for local variable names to be indented
 by the same amount as global ones.
 .It Fl \&lp , nlp
 Lines-up code surrounded by parenthesis in continuation lines.
 If a line
 has a left paren which is not closed on that line, then continuation lines
 will be lined up to start at the character position just after the left
 paren.
 For example, here is how a piece of continued code looks with
 .Fl nlp
 in effect:
 .Bd -literal -offset indent
 p1 = first_procedure(second_procedure(p2, p3),
 \ \ third_procedure(p4, p5));
 .Ed
 .Pp
 With
 .Fl lp
 in effect (the default) the code looks somewhat clearer:
 .Bd -literal -offset indent
 p1\ =\ first_procedure(second_procedure(p2,\ p3),
 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ third_procedure(p4,\ p5));
 .Ed
 .Pp
 Inserting two more newlines we get:
 .Bd -literal -offset indent
 p1\ =\ first_procedure(second_procedure(p2,
 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ p3),
 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ third_procedure(p4,
 \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ p5));
 .Ed
 .It Fl npro
 Causes the profile files,
 .Sq Pa ./.indent.pro
 and
 .Sq Pa ~/.indent.pro ,
 to be ignored.
 .It Fl pcs , npcs
 If true
 .Pq Fl pcs
 all procedure calls will have a space inserted between
 the name and the `('.
 The default is
 .Fl npcs .
 .It Fl psl , npsl
 If true
 .Pq Fl psl
 the names of procedures being defined are placed in
 column 1 \- their types, if any, will be left on the previous lines.
 The
 default is
 .Fl psl .
 .It Fl sac , nsac
 Control whether parenthesized type names in casts are followed by a space or
 not.
 The default is
 .Fl nsac .
 .It Fl \&sc , nsc
 Enables (disables) the placement of asterisks (`*'s) at the left edge of all
 comments.
 The default is
 .Fl sc .
 .It Fl sob , nsob
 If
 .Fl sob
 is specified, indent will swallow optional blank lines.
 You can use this to
 get rid of blank lines after declarations.
 Default:
 .Fl nsob .
 .It Fl \&st
 Causes
 .Nm
 to take its input from stdin and put its output to stdout.
 .It Fl ta
 Automatically add all identifiers ending in "_t" to the list
 of type keywords.
 .It Fl T Ns Ar typename
 Adds
 .Ar typename
 to the list of type keywords.
 Names accumulate:
 .Fl T
 can be specified more than once.
 You need to specify all the typenames that
 appear in your program that are defined by
 .Ic typedef
 \- nothing will be
 harmed if you miss a few, but the program will not be formatted as nicely as
 it should.
 This sounds like a painful thing to have to do, but it is really
 a symptom of a problem in C:
 .Ic typedef
 causes a syntactic change in the
 language and
 .Nm
 cannot find all
 instances of
 .Ic typedef .
 .It Fl troff
 Causes
 .Nm
 to format the program for processing by
 .Xr troff 1 .
 It will produce a fancy
 listing in much the same spirit as
 .Xr vgrind 1 .
 If the output file is not specified, the default is standard output,
 rather than formatting in place.
 .It Fl U Ns Ar file
 Adds type names from
 .Ar file
 to the list of type keywords.
 .It Fl ut , nut
 Enables (disables) the use of tab characters in the output.
 Tabs are assumed to be aligned on columns divisible by 8.
 The default is
 .Fl ut .
 .It Fl v , \&nv
 .Fl v
 turns on `verbose' mode;
 .Fl \&nv
 turns it off.
 When in verbose mode,
 .Nm
 reports when it splits one line of input into two or more lines of output,
 and gives some size statistics at completion.
 The default is
 .Fl \&nv .
 .El
 .Pp
 You may set up your own `profile' of defaults to
 .Nm
 by creating a file called
 .Pa .indent.pro
 in your login directory and/or the current directory and including
 whatever switches you like.
 A `.indent.pro' in the current directory takes
 precedence over the one in your login directory.
 If
 .Nm
 is run and a profile file exists, then it is read to set up the program's
 defaults.
 Switches on the command line, though, always override profile
 switches.
 The switches should be separated by spaces, tabs or newlines.
 .Pp
 .Ss Comments
 .Sq Em Box
 .Em comments .
 The
 .Nm
 utility
 assumes that any comment with a dash or star immediately after the start of
 comment (that is, `/*\-' or `/**') is a comment surrounded by a box of stars.
 Each line of such a comment is left unchanged, except that its indentation
 may be adjusted to account for the change in indentation of the first line
 of the comment.
 .Pp
 .Em Straight text .
 All other comments are treated as straight text.
 The
 .Nm
 utility fits as many words (separated by blanks, tabs, or newlines) on a
 line as possible.
 Blank lines break paragraphs.
 .Ss Comment indentation
 If a comment is on a line with code it is started in the `comment column',
 which is set by the
 .Fl c Ns Ns Ar n
 command line parameter.
 Otherwise, the comment is started at
 .Ar n
 indentation levels less than where code is currently being placed, where
 .Ar n
 is specified by the
 .Fl d Ns Ns Ar n
 command line parameter.
 If the code on a line extends past the comment
 column, the comment starts further to the right, and the right margin may be
 automatically extended in extreme cases.
 .Ss Preprocessor lines
 In general,
 .Nm
 leaves preprocessor lines alone.
 The only
 reformatting that it will do is to straighten up trailing comments.
 It
 leaves embedded comments alone.
 Conditional compilation
 .Pq Ic #ifdef...#endif
 is recognized and
 .Nm
 attempts to correctly
 compensate for the syntactic peculiarities introduced.
 .Ss C syntax
 The
 .Nm
 utility understands a substantial amount about the syntax of C, but it
 has a `forgiving' parser.
 It attempts to cope with the usual sorts of
 incomplete and malformed syntax.
 In particular, the use of macros like:
 .Pp
 .Dl #define forever for(;;)
 .Pp
 is handled properly.
 .Sh ENVIRONMENT
 The
 .Nm
 utility uses the
 .Ev HOME
 environment variable.
 .Sh FILES
 .Bl -tag -width "./.indent.pro" -compact
 .It Pa ./.indent.pro
 profile file
 .It Pa ~/.indent.pro
 profile file
 .El
 .Sh HISTORY
 The
 .Nm
 command appeared in
 .Bx 4.2 .
 .Sh BUGS
 The
 .Nm
 utility has even more switches than
 .Xr ls 1 .
 .Pp
 A common mistake is to try to indent all the
 .Em C
 programs in a directory by typing:
 .Pp
 .Dl indent *.c
 .Pp
 This is probably a bug, not a feature.