+++ /dev/null
-/* $OpenBSD: tty.c,v 1.30 2008/09/15 16:11:35 kjell 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 "def.h"
-
-#include <sys/types.h>
-#include <sys/time.h>
-#include <sys/ioctl.h>
-
-#include <term.h>
-
-static int charcost(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);
-
-/* ARGSUSED */
-static void
-winchhandler(int sig)
-{
- winch_flag = 1;
-}
-
-/*
- * Initialize the terminal when the editor
- * gets started up.
- */
-void
-ttinit(void)
-{
- int errret;
-
- if (setupterm(NULL, 1, &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 = "\n";
- }
-
- 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)
-{
-#ifdef XKEYS
- ttykeymaptidy();
-#endif /* XKEYS */
-
- /* 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;
-
- /* Case of one line insert is special. */
- if (row == bot) {
- ttmove(row, 0);
- tteeol();
- return;
- }
- if (change_scroll_region && scroll_reverse) {
- /* Use scroll region and back index */
- nl = bot - row;
- ttwindow(row, bot);
- ttmove(row, 0);
- while (nchunk--)
- putpad(scroll_reverse, nl);
- ttnowindow();
- return;
- } 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;
-
-#ifdef TIOCGWINSZ
- struct winsize winsize;
-
- if (ioctl(0, TIOCGWINSZ, &winsize) == 0) {
- newrow = winsize.ws_row;
- newcol = winsize.ws_col;
- }
-#endif
- 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(char *s)
-{
- cci = 0;
-
- tputs(s, nrow, fakec);
- return (cci);
-}
projects / pd_readline / blobdiff