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/* $OpenBSD: tty.c,v 1.39 2021/03/20 09:00:49 lum Exp $ */
/* This file is in the public domain. */
/*
* Terminfo display driver
*
* Terminfo is a terminal information database and routines to describe
* terminals on most modern UNIX systems. Many other systems have adopted
* this as a reasonable way to allow for widely varying and ever changing
* varieties of terminal types. This should be used where practical.
*/
/*
* Known problems: If you have a terminal with no clear to end of screen and
* memory of lines below the ones visible on the screen, display will be
* wrong in some cases. I doubt that any such terminal was ever made, but I
* thought everyone with delete line would have clear to end of screen too...
*
* Code for terminals without clear to end of screen and/or clear to end of line
* has not been extensively tested.
*
* Cost calculations are very rough. Costs of insert/delete line may be far
* from the truth. This is accentuated by display.c not knowing about
* multi-line insert/delete.
*
* Using scrolling region vs insert/delete line should probably be based on cost
* rather than the assumption that scrolling region operations look better.
*/
#include <sys/ioctl.h>
#include <sys/queue.h>
#include <sys/types.h>
#include <sys/time.h>
#include <signal.h>
#include <stdio.h>
#include <term.h>
#include <unistd.h>
#include "def.h"
static int charcost(const char *);
static int cci;
static int insdel; /* Do we have both insert & delete line? */
static char *scroll_fwd; /* How to scroll forward. */
static void winchhandler(int);
volatile sig_atomic_t winch_flag;
int tceeol;
int tcinsl;
int tcdell;
/* ARGSUSED */
static void
winchhandler(int sig)
{
winch_flag = 1;
}
/*
* Initialize the terminal when the editor
* gets started up.
*/
void
ttinit(void)
{
char *tty;
int errret;
if (batch == 1)
tty = "pty";
else
tty = NULL;
if (setupterm(tty, STDOUT_FILENO, &errret))
panic("Terminal setup failed");
signal(SIGWINCH, winchhandler);
signal(SIGCONT, winchhandler);
siginterrupt(SIGWINCH, 1);
scroll_fwd = scroll_forward;
if (scroll_fwd == NULL || *scroll_fwd == '\0') {
/* this is what GNU Emacs does */
scroll_fwd = parm_down_cursor;
if (scroll_fwd == NULL || *scroll_fwd == '\0')
scroll_fwd = curbp->b_nlchr;
}
if (cursor_address == NULL || cursor_up == NULL)
panic("This terminal is too stupid to run mg");
/* set nrow & ncol */
ttresize();
if (!clr_eol)
tceeol = ncol;
else
tceeol = charcost(clr_eol);
/* Estimate cost of inserting a line */
if (change_scroll_region && scroll_reverse)
tcinsl = charcost(change_scroll_region) * 2 +
charcost(scroll_reverse);
else if (parm_insert_line)
tcinsl = charcost(parm_insert_line);
else if (insert_line)
tcinsl = charcost(insert_line);
else
/* make this cost high enough */
tcinsl = nrow * ncol;
/* Estimate cost of deleting a line */
if (change_scroll_region)
tcdell = charcost(change_scroll_region) * 2 +
charcost(scroll_fwd);
else if (parm_delete_line)
tcdell = charcost(parm_delete_line);
else if (delete_line)
tcdell = charcost(delete_line);
else
/* make this cost high enough */
tcdell = nrow * ncol;
/* Flag to indicate that we can both insert and delete lines */
insdel = (insert_line || parm_insert_line) &&
(delete_line || parm_delete_line);
if (enter_ca_mode)
/* enter application mode */
putpad(enter_ca_mode, 1);
ttresize();
}
/*
* Re-initialize the terminal when the editor is resumed.
* The keypad_xmit doesn't really belong here but...
*/
void
ttreinit(void)
{
/* check if file was modified while we were gone */
if (fchecktime(curbp) != TRUE) {
curbp->b_flag |= BFDIRTY;
}
if (enter_ca_mode)
/* enter application mode */
putpad(enter_ca_mode, 1);
if (keypad_xmit)
/* turn on keypad */
putpad(keypad_xmit, 1);
ttresize();
}
/*
* Clean up the terminal, in anticipation of a return to the command
* interpreter. This is a no-op on the ANSI display. On the SCALD display,
* it sets the window back to half screen scrolling. Perhaps it should
* query the display for the increment, and put it back to what it was.
*/
void
tttidy(void)
{
ttykeymaptidy();
/* set the term back to normal mode */
if (exit_ca_mode)
putpad(exit_ca_mode, 1);
}
/*
* Move the cursor to the specified origin 0 row and column position. Try to
* optimize out extra moves; redisplay may have left the cursor in the right
* location last time!
*/
void
ttmove(int row, int col)
{
if (ttrow != row || ttcol != col) {
putpad(tgoto(cursor_address, col, row), 1);
ttrow = row;
ttcol = col;
}
}
/*
* Erase to end of line.
*/
void
tteeol(void)
{
int i;
if (clr_eol)
putpad(clr_eol, 1);
else {
i = ncol - ttcol;
while (i--)
ttputc(' ');
ttrow = ttcol = HUGE;
}
}
/*
* Erase to end of page.
*/
void
tteeop(void)
{
int line;
if (clr_eos)
putpad(clr_eos, nrow - ttrow);
else {
putpad(clr_eol, 1);
if (insdel)
ttdell(ttrow + 1, lines, lines - ttrow - 1);
else {
/* do it by hand */
for (line = ttrow + 1; line <= lines; ++line) {
ttmove(line, 0);
tteeol();
}
}
ttrow = ttcol = HUGE;
}
}
/*
* Make a noise.
*/
void
ttbeep(void)
{
putpad(bell, 1);
ttflush();
}
/*
* Insert nchunk blank line(s) onto the screen, scrolling the last line on
* the screen off the bottom. Use the scrolling region if possible for a
* smoother display. If there is no scrolling region, use a set of insert
* and delete line sequences.
*/
void
ttinsl(int row, int bot, int nchunk)
{
int i, nl;
/* One line special cases */
if (row == bot) {
ttmove(row, 0);
tteeol();
return;
}
/* Use scroll region and back index */
if (change_scroll_region && scroll_reverse) {
nl = bot - row;
ttwindow(row, bot);
ttmove(row, 0);
while (nchunk--)
putpad(scroll_reverse, nl);
ttnowindow();
return;
/* else use insert/delete line */
} else if (insdel) {
ttmove(1 + bot - nchunk, 0);
nl = nrow - ttrow;
if (parm_delete_line)
putpad(tgoto(parm_delete_line, 0, nchunk), nl);
else
/* For all lines in the chunk */
for (i = 0; i < nchunk; i++)
putpad(delete_line, nl);
ttmove(row, 0);
/* ttmove() changes ttrow */
nl = nrow - ttrow;
if (parm_insert_line)
putpad(tgoto(parm_insert_line, 0, nchunk), nl);
else
/* For all lines in the chunk */
for (i = 0; i < nchunk; i++)
putpad(insert_line, nl);
ttrow = HUGE;
ttcol = HUGE;
} else
panic("ttinsl: Can't insert/delete line");
}
/*
* Delete nchunk line(s) from "row", replacing the bottom line on the
* screen with a blank line. Unless we're using the scrolling region,
* this is done with crafty sequences of insert and delete lines. The
* presence of the echo area makes a boundary condition go away.
*/
void
ttdell(int row, int bot, int nchunk)
{
int i, nl;
/* One line special cases */
if (row == bot) {
ttmove(row, 0);
tteeol();
return;
}
/* scrolling region */
if (change_scroll_region) {
nl = bot - row;
ttwindow(row, bot);
ttmove(bot, 0);
while (nchunk--)
putpad(scroll_fwd, nl);
ttnowindow();
/* else use insert/delete line */
} else if (insdel) {
ttmove(row, 0);
nl = nrow - ttrow;
if (parm_delete_line)
putpad(tgoto(parm_delete_line, 0, nchunk), nl);
else
/* For all lines in the chunk */
for (i = 0; i < nchunk; i++)
putpad(delete_line, nl);
ttmove(1 + bot - nchunk, 0);
/* ttmove() changes ttrow */
nl = nrow - ttrow;
if (parm_insert_line)
putpad(tgoto(parm_insert_line, 0, nchunk), nl);
else
/* For all lines in the chunk */
for (i = 0; i < nchunk; i++)
putpad(insert_line, nl);
ttrow = HUGE;
ttcol = HUGE;
} else
panic("ttdell: Can't insert/delete line");
}
/*
* This routine sets the scrolling window on the display to go from line
* "top" to line "bot" (origin 0, inclusive). The caller checks for the
* pathological 1-line scroll window which doesn't work right and avoids
* it. The "ttrow" and "ttcol" variables are set to a crazy value to
* ensure that the next call to "ttmove" does not turn into a no-op (the
* window adjustment moves the cursor).
*/
void
ttwindow(int top, int bot)
{
if (change_scroll_region && (tttop != top || ttbot != bot)) {
putpad(tgoto(change_scroll_region, bot, top), nrow - ttrow);
ttrow = HUGE; /* Unknown. */
ttcol = HUGE;
tttop = top; /* Remember region. */
ttbot = bot;
}
}
/*
* Switch to full screen scroll. This is used by "spawn.c" just before it
* suspends the editor and by "display.c" when it is getting ready to
* exit. This function does a full screen scroll by telling the terminal
* to set a scrolling region that is lines or nrow rows high, whichever is
* larger. This behavior seems to work right on systems where you can set
* your terminal size.
*/
void
ttnowindow(void)
{
if (change_scroll_region) {
putpad(tgoto(change_scroll_region,
(nrow > lines ? nrow : lines) - 1, 0), nrow - ttrow);
ttrow = HUGE; /* Unknown. */
ttcol = HUGE;
tttop = HUGE; /* No scroll region. */
ttbot = HUGE;
}
}
/*
* Set the current writing color to the specified color. Watch for color
* changes that are not going to do anything (the color is already right)
* and don't send anything to the display. The rainbow version does this
* in putline.s on a line by line basis, so don't bother sending out the
* color shift.
*/
void
ttcolor(int color)
{
if (color != tthue) {
if (color == CTEXT)
/* normal video */
putpad(exit_standout_mode, 1);
else if (color == CMODE)
/* reverse video */
putpad(enter_standout_mode, 1);
/* save the color */
tthue = color;
}
}
/*
* This routine is called by the "refresh the screen" command to try
* to resize the display. Look in "window.c" to see how
* the caller deals with a change.
*
* We use `newrow' and `newcol' so vtresize() know the difference between the
* new and old settings.
*/
void
ttresize(void)
{
int newrow = 0, newcol = 0;
struct winsize winsize;
if (ioctl(0, TIOCGWINSZ, &winsize) == 0) {
newrow = winsize.ws_row;
newcol = winsize.ws_col;
}
if ((newrow <= 0 || newcol <= 0) &&
((newrow = lines) <= 0 || (newcol = columns) <= 0)) {
newrow = 24;
newcol = 80;
}
if (vtresize(1, newrow, newcol) != TRUE)
panic("vtresize failed");
}
/*
* fake char output for charcost()
*/
/* ARGSUSED */
static int
fakec(int c)
{
cci++;
return (0);
}
/* calculate the cost of doing string s */
static int
charcost(const char *s)
{
cci = 0;
tputs(s, nrow, fakec);
return (cci);
}