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Diffstat (limited to 'contrib/libreadline/display.c')
| -rw-r--r-- | contrib/libreadline/display.c | 1503 |
1 files changed, 0 insertions, 1503 deletions
diff --git a/contrib/libreadline/display.c b/contrib/libreadline/display.c deleted file mode 100644 index c0dff1f5bed4..000000000000 --- a/contrib/libreadline/display.c +++ /dev/null @@ -1,1503 +0,0 @@ -/* display.c -- readline redisplay facility. */ - -/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc. - - This file is part of the GNU Readline Library, a library for - reading lines of text with interactive input and history editing. - - The GNU Readline Library is free software; you can redistribute it - and/or modify it under the terms of the GNU General Public License - as published by the Free Software Foundation; either version 1, or - (at your option) any later version. - - The GNU Readline Library 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. - - The GNU General Public License is often shipped with GNU software, and - is generally kept in a file called COPYING or LICENSE. If you do not - have a copy of the license, write to the Free Software Foundation, - 675 Mass Ave, Cambridge, MA 02139, USA. */ -#define READLINE_LIBRARY - -#if defined (HAVE_CONFIG_H) -# include <config.h> -#endif - -#include <stdio.h> -#include <sys/types.h> - -#if defined (HAVE_UNISTD_H) -# include <unistd.h> -#endif /* HAVE_UNISTD_H */ - -#if defined (HAVE_STDLIB_H) -# include <stdlib.h> -#else -# include "ansi_stdlib.h" -#endif /* HAVE_STDLIB_H */ - -#include "posixstat.h" - -/* System-specific feature definitions and include files. */ -#include "rldefs.h" - -/* Termcap library stuff. */ -#include "tcap.h" - -/* Some standard library routines. */ -#include "readline.h" -#include "history.h" - -#if !defined (strchr) && !defined (__STDC__) -extern char *strchr (), *strrchr (); -#endif /* !strchr && !__STDC__ */ - -/* Global and pseudo-global variables and functions - imported from readline.c. */ -extern char *rl_prompt; -extern int readline_echoing_p; - -extern int _rl_output_meta_chars; -extern int _rl_horizontal_scroll_mode; -extern int _rl_mark_modified_lines; -extern int _rl_prefer_visible_bell; - -/* Variables and functions imported from terminal.c */ -extern void _rl_output_some_chars (); -extern int _rl_output_character_function (); -extern int _rl_backspace (); - -extern char *term_clreol, *term_im, *term_ic, *term_ei, *term_DC; -extern char *term_up, *term_dc, *term_cr, *term_IC; -extern int screenheight, screenwidth, screenchars; -extern int terminal_can_insert, _rl_term_autowrap; - -/* Pseudo-global functions (local to the readline library) exported - by this file. */ -void _rl_move_cursor_relative (), _rl_output_some_chars (); -void _rl_move_vert (); - -static void update_line (), clear_to_eol (), space_to_eol (); -static void delete_chars (), insert_some_chars (); -static void cr (); - -static int *inv_lbreaks, *vis_lbreaks; - -extern char *xmalloc (), *xrealloc (); - -/* Heuristic used to decide whether it is faster to move from CUR to NEW - by backing up or outputting a carriage return and moving forward. */ -#define CR_FASTER(new, cur) (((new) + 1) < ((cur) - (new))) - -/* **************************************************************** */ -/* */ -/* Display stuff */ -/* */ -/* **************************************************************** */ - -/* This is the stuff that is hard for me. I never seem to write good - display routines in C. Let's see how I do this time. */ - -/* (PWP) Well... Good for a simple line updater, but totally ignores - the problems of input lines longer than the screen width. - - update_line and the code that calls it makes a multiple line, - automatically wrapping line update. Careful attention needs - to be paid to the vertical position variables. */ - -/* Keep two buffers; one which reflects the current contents of the - screen, and the other to draw what we think the new contents should - be. Then compare the buffers, and make whatever changes to the - screen itself that we should. Finally, make the buffer that we - just drew into be the one which reflects the current contents of the - screen, and place the cursor where it belongs. - - Commands that want to can fix the display themselves, and then let - this function know that the display has been fixed by setting the - RL_DISPLAY_FIXED variable. This is good for efficiency. */ - -/* Application-specific redisplay function. */ -VFunction *rl_redisplay_function = rl_redisplay; - -/* Global variables declared here. */ -/* What YOU turn on when you have handled all redisplay yourself. */ -int rl_display_fixed = 0; - -int _rl_suppress_redisplay = 0; - -/* The stuff that gets printed out before the actual text of the line. - This is usually pointing to rl_prompt. */ -char *rl_display_prompt = (char *)NULL; - -/* Pseudo-global variables declared here. */ -/* The visible cursor position. If you print some text, adjust this. */ -int _rl_last_c_pos = 0; -int _rl_last_v_pos = 0; - -/* Number of lines currently on screen minus 1. */ -int _rl_vis_botlin = 0; - -/* Variables used only in this file. */ -/* The last left edge of text that was displayed. This is used when - doing horizontal scrolling. It shifts in thirds of a screenwidth. */ -static int last_lmargin; - -/* The line display buffers. One is the line currently displayed on - the screen. The other is the line about to be displayed. */ -static char *visible_line = (char *)NULL; -static char *invisible_line = (char *)NULL; - -/* A buffer for `modeline' messages. */ -static char msg_buf[128]; - -/* Non-zero forces the redisplay even if we thought it was unnecessary. */ -static int forced_display; - -/* Default and initial buffer size. Can grow. */ -static int line_size = 1024; - -static char *local_prompt, *local_prompt_prefix; -static int visible_length, prefix_length; - -/* The number of invisible characters in the line currently being - displayed on the screen. */ -static int visible_wrap_offset; - -/* static so it can be shared between rl_redisplay and update_line */ -static int wrap_offset; - -/* The index of the last invisible_character in the prompt string. */ -static int last_invisible; - -/* The length (buffer offset) of the first line of the last (possibly - multi-line) buffer displayed on the screen. */ -static int visible_first_line_len; - -/* Expand the prompt string S and return the number of visible - characters in *LP, if LP is not null. This is currently more-or-less - a placeholder for expansion. LIP, if non-null is a place to store the - index of the last invisible character in ther eturned string. */ - -/* Current implementation: - \001 (^A) start non-visible characters - \002 (^B) end non-visible characters - all characters except \001 and \002 (following a \001) are copied to - the returned string; all characters except those between \001 and - \002 are assumed to be `visible'. */ - -static char * -expand_prompt (pmt, lp, lip) - char *pmt; - int *lp, *lip; -{ - char *r, *ret, *p; - int l, rl, last, ignoring; - - /* Short-circuit if we can. */ - if (strchr (pmt, RL_PROMPT_START_IGNORE) == 0) - { - r = savestring (pmt); - if (lp) - *lp = strlen (r); - return r; - } - - l = strlen (pmt); - r = ret = xmalloc (l + 1); - - for (rl = ignoring = last = 0, p = pmt; p && *p; p++) - { - /* This code strips the invisible character string markers - RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */ - if (*p == RL_PROMPT_START_IGNORE) - { - ignoring++; - continue; - } - else if (ignoring && *p == RL_PROMPT_END_IGNORE) - { - ignoring = 0; - last = r - ret - 1; - continue; - } - else - { - *r++ = *p; - if (!ignoring) - rl++; - } - } - - *r = '\0'; - if (lp) - *lp = rl; - if (lip) - *lip = last; - return ret; -} - -/* - * Expand the prompt string into the various display components, if - * necessary. - * - * local_prompt = expanded last line of string in rl_display_prompt - * (portion after the final newline) - * local_prompt_prefix = portion before last newline of rl_display_prompt, - * expanded via expand_prompt - * visible_length = number of visible characters in local_prompt - * prefix_length = number of visible characters in local_prompt_prefix - * - * This function is called once per call to readline(). It may also be - * called arbitrarily to expand the primary prompt. - * - * The return value is the number of visible characters on the last line - * of the (possibly multi-line) prompt. - */ -int -rl_expand_prompt (prompt) - char *prompt; -{ - char *p, *t; - int c; - - /* Clear out any saved values. */ - if (local_prompt) - free (local_prompt); - if (local_prompt_prefix) - free (local_prompt_prefix); - local_prompt = local_prompt_prefix = (char *)0; - last_invisible = 0; - - if (prompt == 0 || *prompt == 0) - return (0); - - p = strrchr (prompt, '\n'); - if (!p) - { - /* The prompt is only one line. */ - local_prompt = expand_prompt (prompt, &visible_length, &last_invisible); - local_prompt_prefix = (char *)0; - return (visible_length); - } - else - { - /* The prompt spans multiple lines. */ - t = ++p; - local_prompt = expand_prompt (p, &visible_length, &last_invisible); - c = *t; *t = '\0'; - /* The portion of the prompt string up to and including the - final newline is now null-terminated. */ - local_prompt_prefix = expand_prompt (prompt, &prefix_length, (int *)NULL); - *t = c; - return (prefix_length); - } -} - -/* Basic redisplay algorithm. */ -void -rl_redisplay () -{ - register int in, out, c, linenum, cursor_linenum; - register char *line; - int c_pos, inv_botlin, lb_botlin, lb_linenum; - int newlines, lpos; - char *prompt_this_line; - - if (!readline_echoing_p) - return; - - if (!rl_display_prompt) - rl_display_prompt = ""; - - if (invisible_line == 0) - { - visible_line = xmalloc (line_size); - invisible_line = xmalloc (line_size); - for (in = 0; in < line_size; in++) - { - visible_line[in] = 0; - invisible_line[in] = 1; - } - - /* should be enough, but then again, this is just for testing. */ - inv_lbreaks = (int *)malloc (256 * sizeof (int)); - vis_lbreaks = (int *)malloc (256 * sizeof (int)); - inv_lbreaks[0] = vis_lbreaks[0] = 0; - - rl_on_new_line (); - } - - /* Draw the line into the buffer. */ - c_pos = -1; - - line = invisible_line; - out = inv_botlin = 0; - - /* Mark the line as modified or not. We only do this for history - lines. */ - if (_rl_mark_modified_lines && current_history () && rl_undo_list) - { - line[out++] = '*'; - line[out] = '\0'; - } - - /* If someone thought that the redisplay was handled, but the currently - visible line has a different modification state than the one about - to become visible, then correct the caller's misconception. */ - if (visible_line[0] != invisible_line[0]) - rl_display_fixed = 0; - - /* If the prompt to be displayed is the `primary' readline prompt (the - one passed to readline()), use the values we have already expanded. - If not, use what's already in rl_display_prompt. WRAP_OFFSET is the - number of non-visible characters in the prompt string. */ - if (rl_display_prompt == rl_prompt || local_prompt) - { - int local_len = local_prompt ? strlen (local_prompt) : 0; - if (local_prompt_prefix && forced_display) - _rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix)); - - if (local_len > 0) - { - strncpy (line + out, local_prompt, local_len); - out += local_len; - } - line[out] = '\0'; - wrap_offset = local_len - visible_length; - } - else - { - int pmtlen; - prompt_this_line = strrchr (rl_display_prompt, '\n'); - if (!prompt_this_line) - prompt_this_line = rl_display_prompt; - else - { - prompt_this_line++; - if (forced_display) - { - _rl_output_some_chars (rl_display_prompt, prompt_this_line - rl_display_prompt); - /* Make sure we are at column zero even after a newline, - regardless of the state of terminal output processing. */ - if (prompt_this_line[-2] != '\r') - cr (); - } - } - - pmtlen = strlen (prompt_this_line); - strncpy (line + out, prompt_this_line, pmtlen); - out += pmtlen; - line[out] = '\0'; - wrap_offset = 0; - } - -#define CHECK_LPOS() \ - do { \ - lpos++; \ - if (lpos >= screenwidth) \ - { \ - inv_lbreaks[++newlines] = out; \ - lpos = 0; \ - } \ - } while (0) - - /* inv_lbreaks[i] is where line i starts in the buffer. */ - inv_lbreaks[newlines = 0] = 0; - - for (in = 0, lpos = out - wrap_offset; in < rl_end; in++) - { - c = (unsigned char)rl_line_buffer[in]; - - if (out + 8 >= line_size) /* XXX - 8 for \t */ - { - line_size *= 2; - visible_line = xrealloc (visible_line, line_size); - invisible_line = xrealloc (invisible_line, line_size); - line = invisible_line; - } - - if (in == rl_point) - { - c_pos = out; - lb_linenum = newlines; - } - - if (META_CHAR (c)) - { - if (_rl_output_meta_chars == 0) - { - sprintf (line + out, "\\%o", c); - - if (lpos + 4 >= screenwidth) - { - register int temp; - - temp = screenwidth - lpos; - inv_lbreaks[++newlines] = out + temp; - lpos = 4 - temp; - } - else - lpos += 4; - - out += 4; - } - else - { - line[out++] = c; - CHECK_LPOS(); - } - } -#if defined (DISPLAY_TABS) - else if (c == '\t') - { - register int temp, newout; - newout = (out | (int)7) + 1; - temp = newout - out; - if (lpos + temp >= screenwidth) - { - register int temp2; - temp2 = screenwidth - lpos; - inv_lbreaks[++newlines] = out + temp2; - lpos = temp - temp2; - while (out < newout) - line[out++] = ' '; - } - else - { - while (out < newout) - line[out++] = ' '; - lpos += temp; - } - } -#endif - else if (c == '\n' && _rl_horizontal_scroll_mode == 0 && term_up && *term_up) - { - line[out++] = '\0'; /* XXX - sentinel */ - inv_lbreaks[++newlines] = out; - lpos = 0; - } - else if (CTRL_CHAR (c) || c == RUBOUT) - { - line[out++] = '^'; - CHECK_LPOS(); - line[out++] = CTRL_CHAR (c) ? UNCTRL (c) : '?'; - CHECK_LPOS(); - } - else - { - line[out++] = c; - CHECK_LPOS(); - } - } - line[out] = '\0'; - if (c_pos < 0) - { - c_pos = out; - lb_linenum = newlines; - } - - inv_botlin = lb_botlin = newlines; - inv_lbreaks[newlines+1] = out; - cursor_linenum = lb_linenum; - - /* C_POS == position in buffer where cursor should be placed. */ - - /* PWP: now is when things get a bit hairy. The visible and invisible - line buffers are really multiple lines, which would wrap every - (screenwidth - 1) characters. Go through each in turn, finding - the changed region and updating it. The line order is top to bottom. */ - - /* If we can move the cursor up and down, then use multiple lines, - otherwise, let long lines display in a single terminal line, and - horizontally scroll it. */ - - if (_rl_horizontal_scroll_mode == 0 && term_up && *term_up) - { - int nleft, pos, changed_screen_line; - - if (!rl_display_fixed || forced_display) - { - forced_display = 0; - - /* If we have more than a screenful of material to display, then - only display a screenful. We should display the last screen, - not the first. */ - if (out >= screenchars) - out = screenchars - 1; - - /* The first line is at character position 0 in the buffer. The - second and subsequent lines start at inv_lbreaks[N], offset by - OFFSET (which has already been calculated above). */ - -#define W_OFFSET(line, offset) ((line) == 0 ? offset : 0) -#define VIS_LLEN(l) ((l) > _rl_vis_botlin ? 0 : (vis_lbreaks[l+1] - vis_lbreaks[l])) -#define INV_LLEN(l) (inv_lbreaks[l+1] - inv_lbreaks[l]) -#define VIS_CHARS(line) (visible_line + vis_lbreaks[line]) -#define VIS_LINE(line) ((line) > _rl_vis_botlin) ? "" : VIS_CHARS(line) -#define INV_LINE(line) (invisible_line + inv_lbreaks[line]) - - /* For each line in the buffer, do the updating display. */ - for (linenum = 0; linenum <= inv_botlin; linenum++) - { - update_line (VIS_LINE(linenum), INV_LINE(linenum), linenum, - VIS_LLEN(linenum), INV_LLEN(linenum), inv_botlin); - - /* If this is the line with the prompt, we might need to - compensate for invisible characters in the new line. Do - this only if there is not more than one new line (which - implies that we completely overwrite the old visible line) - and the new line is shorter than the old. Make sure we are - at the end of the new line before clearing. */ - if (linenum == 0 && - inv_botlin == 0 && _rl_last_c_pos == out && - (wrap_offset > visible_wrap_offset) && - (_rl_last_c_pos < visible_first_line_len)) - { - nleft = screenwidth + wrap_offset - _rl_last_c_pos; - if (nleft) - clear_to_eol (nleft); - } - - /* Since the new first line is now visible, save its length. */ - if (linenum == 0) - visible_first_line_len = (inv_botlin > 0) ? inv_lbreaks[1] : out - wrap_offset; - } - - /* We may have deleted some lines. If so, clear the left over - blank ones at the bottom out. */ - if (_rl_vis_botlin > inv_botlin) - { - char *tt; - for (; linenum <= _rl_vis_botlin; linenum++) - { - tt = VIS_CHARS (linenum); - _rl_move_vert (linenum); - _rl_move_cursor_relative (0, tt); - clear_to_eol - ((linenum == _rl_vis_botlin) ? strlen (tt) : screenwidth); - } - } - _rl_vis_botlin = inv_botlin; - - /* CHANGED_SCREEN_LINE is set to 1 if we have moved to a - different screen line during this redisplay. */ - changed_screen_line = _rl_last_v_pos != cursor_linenum; - if (changed_screen_line) - { - _rl_move_vert (cursor_linenum); - /* If we moved up to the line with the prompt using term_up, - the physical cursor position on the screen stays the same, - but the buffer position needs to be adjusted to account - for invisible characters. */ - if (cursor_linenum == 0 && wrap_offset) - _rl_last_c_pos += wrap_offset; - } - - /* We have to reprint the prompt if it contains invisible - characters, since it's not generally OK to just reprint - the characters from the current cursor position. But we - only need to reprint it if the cursor is before the last - invisible character in the prompt string. */ - nleft = visible_length + wrap_offset; - if (cursor_linenum == 0 && wrap_offset > 0 && _rl_last_c_pos > 0 && - _rl_last_c_pos <= last_invisible && local_prompt) - { - if (term_cr) - tputs (term_cr, 1, _rl_output_character_function); - _rl_output_some_chars (local_prompt, nleft); - _rl_last_c_pos = nleft; - } - - /* Where on that line? And where does that line start - in the buffer? */ - pos = inv_lbreaks[cursor_linenum]; - /* nleft == number of characters in the line buffer between the - start of the line and the cursor position. */ - nleft = c_pos - pos; - - /* Since _rl_backspace() doesn't know about invisible characters in the - prompt, and there's no good way to tell it, we compensate for - those characters here and call _rl_backspace() directly. */ - if (wrap_offset && cursor_linenum == 0 && nleft < _rl_last_c_pos) - { - _rl_backspace (_rl_last_c_pos - nleft); - _rl_last_c_pos = nleft; - } - - if (nleft != _rl_last_c_pos) - _rl_move_cursor_relative (nleft, &invisible_line[pos]); - } - } - else /* Do horizontal scrolling. */ - { -#define M_OFFSET(margin, offset) ((margin) == 0 ? offset : 0) - int lmargin, ndisp, nleft, phys_c_pos, t; - - /* Always at top line. */ - _rl_last_v_pos = 0; - - /* Compute where in the buffer the displayed line should start. This - will be LMARGIN. */ - - /* The number of characters that will be displayed before the cursor. */ - ndisp = c_pos - wrap_offset; - nleft = visible_length + wrap_offset; - /* Where the new cursor position will be on the screen. This can be - longer than SCREENWIDTH; if it is, lmargin will be adjusted. */ - phys_c_pos = c_pos - (last_lmargin ? last_lmargin : wrap_offset); - t = screenwidth / 3; - - /* If the number of characters had already exceeded the screenwidth, - last_lmargin will be > 0. */ - - /* If the number of characters to be displayed is more than the screen - width, compute the starting offset so that the cursor is about - two-thirds of the way across the screen. */ - if (phys_c_pos > screenwidth - 2) - { - lmargin = c_pos - (2 * t); - if (lmargin < 0) - lmargin = 0; - /* If the left margin would be in the middle of a prompt with - invisible characters, don't display the prompt at all. */ - if (wrap_offset && lmargin > 0 && lmargin < nleft) - lmargin = nleft; - } - else if (ndisp < screenwidth - 2) /* XXX - was -1 */ - lmargin = 0; - else if (phys_c_pos < 1) - { - /* If we are moving back towards the beginning of the line and - the last margin is no longer correct, compute a new one. */ - lmargin = ((c_pos - 1) / t) * t; /* XXX */ - if (wrap_offset && lmargin > 0 && lmargin < nleft) - lmargin = nleft; - } - else - lmargin = last_lmargin; - - /* If the first character on the screen isn't the first character - in the display line, indicate this with a special character. */ - if (lmargin > 0) - line[lmargin] = '<'; - - /* If SCREENWIDTH characters starting at LMARGIN do not encompass - the whole line, indicate that with a special characters at the - right edge of the screen. If LMARGIN is 0, we need to take the - wrap offset into account. */ - t = lmargin + M_OFFSET (lmargin, wrap_offset) + screenwidth; - if (t < out) - line[t - 1] = '>'; - - if (!rl_display_fixed || forced_display || lmargin != last_lmargin) - { - forced_display = 0; - update_line (&visible_line[last_lmargin], - &invisible_line[lmargin], - 0, - screenwidth + visible_wrap_offset, - screenwidth + (lmargin ? 0 : wrap_offset), - 0); - - /* If the visible new line is shorter than the old, but the number - of invisible characters is greater, and we are at the end of - the new line, we need to clear to eol. */ - t = _rl_last_c_pos - M_OFFSET (lmargin, wrap_offset); - if ((M_OFFSET (lmargin, wrap_offset) > visible_wrap_offset) && - (_rl_last_c_pos == out) && - t < visible_first_line_len) - { - nleft = screenwidth - t; - clear_to_eol (nleft); - } - visible_first_line_len = out - lmargin - M_OFFSET (lmargin, wrap_offset); - if (visible_first_line_len > screenwidth) - visible_first_line_len = screenwidth; - - _rl_move_cursor_relative (c_pos - lmargin, &invisible_line[lmargin]); - last_lmargin = lmargin; - } - } - fflush (rl_outstream); - - /* Swap visible and non-visible lines. */ - { - char *temp = visible_line; - int *itemp = vis_lbreaks; - visible_line = invisible_line; - invisible_line = temp; - vis_lbreaks = inv_lbreaks; - inv_lbreaks = itemp; - rl_display_fixed = 0; - /* If we are displaying on a single line, and last_lmargin is > 0, we - are not displaying any invisible characters, so set visible_wrap_offset - to 0. */ - if (_rl_horizontal_scroll_mode && last_lmargin) - visible_wrap_offset = 0; - else - visible_wrap_offset = wrap_offset; - } -} - -/* PWP: update_line() is based on finding the middle difference of each - line on the screen; vis: - - /old first difference - /beginning of line | /old last same /old EOL - v v v v -old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as -new: eddie> Oh, my little buggy says to me, as lurgid as - ^ ^ ^ ^ - \beginning of line | \new last same \new end of line - \new first difference - - All are character pointers for the sake of speed. Special cases for - no differences, as well as for end of line additions must be handeled. - - Could be made even smarter, but this works well enough */ -static void -update_line (old, new, current_line, omax, nmax, inv_botlin) - register char *old, *new; - int current_line, omax, nmax, inv_botlin; -{ - register char *ofd, *ols, *oe, *nfd, *nls, *ne; - int temp, lendiff, wsatend, od, nd; - int current_invis_chars; - - /* If we're at the right edge of a terminal that supports xn, we're - ready to wrap around, so do so. This fixes problems with knowing - the exact cursor position and cut-and-paste with certain terminal - emulators. In this calculation, TEMP is the physical screen - position of the cursor. */ - temp = _rl_last_c_pos - W_OFFSET(_rl_last_v_pos, visible_wrap_offset); - if (temp == screenwidth && _rl_term_autowrap && !_rl_horizontal_scroll_mode - && _rl_last_v_pos == current_line - 1) - { - if (new[0]) - putc (new[0], rl_outstream); - else - putc (' ', rl_outstream); - _rl_last_c_pos = 1; /* XXX */ - _rl_last_v_pos++; - if (old[0] && new[0]) - old[0] = new[0]; - } - - /* Find first difference. */ - for (ofd = old, nfd = new; - (ofd - old < omax) && *ofd && (*ofd == *nfd); - ofd++, nfd++) - ; - - /* Move to the end of the screen line. ND and OD are used to keep track - of the distance between ne and new and oe and old, respectively, to - move a subtraction out of each loop. */ - for (od = ofd - old, oe = ofd; od < omax && *oe; oe++, od++); - for (nd = nfd - new, ne = nfd; nd < nmax && *ne; ne++, nd++); - - /* If no difference, continue to next line. */ - if (ofd == oe && nfd == ne) - return; - - wsatend = 1; /* flag for trailing whitespace */ - ols = oe - 1; /* find last same */ - nls = ne - 1; - while ((ols > ofd) && (nls > nfd) && (*ols == *nls)) - { - if (*ols != ' ') - wsatend = 0; - ols--; - nls--; - } - - if (wsatend) - { - ols = oe; - nls = ne; - } - else if (*ols != *nls) - { - if (*ols) /* don't step past the NUL */ - ols++; - if (*nls) - nls++; - } - - /* count of invisible characters in the current invisible line. */ - current_invis_chars = W_OFFSET (current_line, wrap_offset); - if (_rl_last_v_pos != current_line) - { - _rl_move_vert (current_line); - if (current_line == 0 && visible_wrap_offset) - _rl_last_c_pos += visible_wrap_offset; - } - - /* If this is the first line and there are invisible characters in the - prompt string, and the prompt string has not changed, and the current - cursor position is before the last invisible character in the prompt, - and the index of the character to move to is past the end of the prompt - string, then redraw the entire prompt string. We can only do this - reliably if the terminal supports a `cr' capability. - - This is not an efficiency hack -- there is a problem with redrawing - portions of the prompt string if they contain terminal escape - sequences (like drawing the `unbold' sequence without a corresponding - `bold') that manifests itself on certain terminals. */ - - lendiff = local_prompt ? strlen (local_prompt) : 0; - od = ofd - old; /* index of first difference in visible line */ - if (current_line == 0 && !_rl_horizontal_scroll_mode && - term_cr && lendiff > visible_length && _rl_last_c_pos > 0 && - od > lendiff && _rl_last_c_pos < last_invisible) - { - tputs (term_cr, 1, _rl_output_character_function); - _rl_output_some_chars (local_prompt, lendiff); - _rl_last_c_pos = lendiff; - } - - _rl_move_cursor_relative (od, old); - - /* if (len (new) > len (old)) */ - lendiff = (nls - nfd) - (ols - ofd); - - /* If we are changing the number of invisible characters in a line, and - the spot of first difference is before the end of the invisible chars, - lendiff needs to be adjusted. */ - if (current_line == 0 && !_rl_horizontal_scroll_mode && - current_invis_chars != visible_wrap_offset) - { - temp = visible_wrap_offset - current_invis_chars; - lendiff += temp; - } - - /* Insert (diff (len (old), len (new)) ch. */ - temp = ne - nfd; - if (lendiff > 0) - { - /* Non-zero if we're increasing the number of lines. */ - int gl = current_line >= _rl_vis_botlin && inv_botlin > _rl_vis_botlin; - /* Sometimes it is cheaper to print the characters rather than - use the terminal's capabilities. If we're growing the number - of lines, make sure we actually cause the new line to wrap - around on auto-wrapping terminals. */ - if (terminal_can_insert && ((2 * temp) >= lendiff || term_IC) && (!_rl_term_autowrap || !gl)) - { - /* If lendiff > visible_length and _rl_last_c_pos == 0 and - _rl_horizontal_scroll_mode == 1, inserting the characters with - term_IC or term_ic will screw up the screen because of the - invisible characters. We need to just draw them. */ - if (*ols && (!_rl_horizontal_scroll_mode || _rl_last_c_pos > 0 || - lendiff <= visible_length || !current_invis_chars)) - { - insert_some_chars (nfd, lendiff); - _rl_last_c_pos += lendiff; - } - else if (*ols == 0) - { - /* At the end of a line the characters do not have to - be "inserted". They can just be placed on the screen. */ - /* However, this screws up the rest of this block, which - assumes you've done the insert because you can. */ - _rl_output_some_chars (nfd, lendiff); - _rl_last_c_pos += lendiff; - } - else - { - /* We have horizontal scrolling and we are not inserting at - the end. We have invisible characters in this line. This - is a dumb update. */ - _rl_output_some_chars (nfd, temp); - _rl_last_c_pos += temp; - return; - } - /* Copy (new) chars to screen from first diff to last match. */ - temp = nls - nfd; - if ((temp - lendiff) > 0) - { - _rl_output_some_chars (nfd + lendiff, temp - lendiff); - _rl_last_c_pos += temp - lendiff; - } - } - else - { - /* cannot insert chars, write to EOL */ - _rl_output_some_chars (nfd, temp); - _rl_last_c_pos += temp; - } - } - else /* Delete characters from line. */ - { - /* If possible and inexpensive to use terminal deletion, then do so. */ - if (term_dc && (2 * temp) >= -lendiff) - { - /* If all we're doing is erasing the invisible characters in the - prompt string, don't bother. It screws up the assumptions - about what's on the screen. */ - if (_rl_horizontal_scroll_mode && _rl_last_c_pos == 0 && - -lendiff == visible_wrap_offset) - lendiff = 0; - - if (lendiff) - delete_chars (-lendiff); /* delete (diff) characters */ - - /* Copy (new) chars to screen from first diff to last match */ - temp = nls - nfd; - if (temp > 0) - { - _rl_output_some_chars (nfd, temp); - _rl_last_c_pos += temp; - } - } - /* Otherwise, print over the existing material. */ - else - { - if (temp > 0) - { - _rl_output_some_chars (nfd, temp); - _rl_last_c_pos += temp; - } - lendiff = (oe - old) - (ne - new); - if (_rl_term_autowrap && current_line < inv_botlin) - space_to_eol (lendiff); - else - clear_to_eol (lendiff); - } - } -} - -/* Tell the update routines that we have moved onto a new (empty) line. */ -int -rl_on_new_line () -{ - if (visible_line) - visible_line[0] = '\0'; - - _rl_last_c_pos = _rl_last_v_pos = 0; - _rl_vis_botlin = last_lmargin = 0; - if (vis_lbreaks) - vis_lbreaks[0] = vis_lbreaks[1] = 0; - visible_wrap_offset = 0; - return 0; -} - -/* Actually update the display, period. */ -int -rl_forced_update_display () -{ - if (visible_line) - { - register char *temp = visible_line; - - while (*temp) - *temp++ = '\0'; - } - rl_on_new_line (); - forced_display++; - (*rl_redisplay_function) (); - return 0; -} - -/* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices. - DATA is the contents of the screen line of interest; i.e., where - the movement is being done. */ -void -_rl_move_cursor_relative (new, data) - int new; - char *data; -{ - register int i; - - /* If we don't have to do anything, then return. */ - if (_rl_last_c_pos == new) return; - - /* It may be faster to output a CR, and then move forwards instead - of moving backwards. */ - /* i == current physical cursor position. */ - i = _rl_last_c_pos - W_OFFSET(_rl_last_v_pos, visible_wrap_offset); - if (new == 0 || CR_FASTER (new, _rl_last_c_pos) || - (_rl_term_autowrap && i == screenwidth)) - { -#if defined (__MSDOS__) - putc ('\r', rl_outstream); -#else - tputs (term_cr, 1, _rl_output_character_function); -#endif /* !__MSDOS__ */ - _rl_last_c_pos = 0; - } - - if (_rl_last_c_pos < new) - { - /* Move the cursor forward. We do it by printing the command - to move the cursor forward if there is one, else print that - portion of the output buffer again. Which is cheaper? */ - - /* The above comment is left here for posterity. It is faster - to print one character (non-control) than to print a control - sequence telling the terminal to move forward one character. - That kind of control is for people who don't know what the - data is underneath the cursor. */ -#if defined (HACK_TERMCAP_MOTION) - extern char *term_forward_char; - - if (term_forward_char) - for (i = _rl_last_c_pos; i < new; i++) - tputs (term_forward_char, 1, _rl_output_character_function); - else - for (i = _rl_last_c_pos; i < new; i++) - putc (data[i], rl_outstream); -#else - for (i = _rl_last_c_pos; i < new; i++) - putc (data[i], rl_outstream); -#endif /* HACK_TERMCAP_MOTION */ - } - else if (_rl_last_c_pos != new) - _rl_backspace (_rl_last_c_pos - new); - _rl_last_c_pos = new; -} - -/* PWP: move the cursor up or down. */ -void -_rl_move_vert (to) - int to; -{ - register int delta, i; - - if (_rl_last_v_pos == to || to > screenheight) - return; - -#if defined (__GO32__) - { - int row, col; - - ScreenGetCursor (&row, &col); - ScreenSetCursor ((row + to - _rl_last_v_pos), col); - } -#else /* !__GO32__ */ - - if ((delta = to - _rl_last_v_pos) > 0) - { - for (i = 0; i < delta; i++) - putc ('\n', rl_outstream); - tputs (term_cr, 1, _rl_output_character_function); - _rl_last_c_pos = 0; - } - else - { /* delta < 0 */ - if (term_up && *term_up) - for (i = 0; i < -delta; i++) - tputs (term_up, 1, _rl_output_character_function); - } -#endif /* !__GO32__ */ - _rl_last_v_pos = to; /* Now TO is here */ -} - -/* Physically print C on rl_outstream. This is for functions which know - how to optimize the display. Return the number of characters output. */ -int -rl_show_char (c) - int c; -{ - int n = 1; - if (META_CHAR (c) && (_rl_output_meta_chars == 0)) - { - fprintf (rl_outstream, "M-"); - n += 2; - c = UNMETA (c); - } - -#if defined (DISPLAY_TABS) - if ((CTRL_CHAR (c) && c != '\t') || c == RUBOUT) -#else - if (CTRL_CHAR (c) || c == RUBOUT) -#endif /* !DISPLAY_TABS */ - { - fprintf (rl_outstream, "C-"); - n += 2; - c = CTRL_CHAR (c) ? UNCTRL (c) : '?'; - } - - putc (c, rl_outstream); - fflush (rl_outstream); - return n; -} - -int -rl_character_len (c, pos) - register int c, pos; -{ - unsigned char uc; - - uc = (unsigned char)c; - - if (META_CHAR (uc)) - return ((_rl_output_meta_chars == 0) ? 4 : 1); - - if (uc == '\t') - { -#if defined (DISPLAY_TABS) - return (((pos | 7) + 1) - pos); -#else - return (2); -#endif /* !DISPLAY_TABS */ - } - - if (CTRL_CHAR (c) || c == RUBOUT) - return (2); - - return ((isprint (uc)) ? 1 : 2); -} - -/* How to print things in the "echo-area". The prompt is treated as a - mini-modeline. */ - -#if defined (USE_VARARGS) -int -#if defined (PREFER_STDARG) -rl_message (const char *format, ...) -#else -rl_message (va_alist) - va_dcl -#endif -{ - va_list args; -#if defined (PREFER_VARARGS) - char *format; -#endif - -#if defined (PREFER_STDARG) - va_start (args, format); -#else - va_start (args); - format = va_arg (args, char *); -#endif - - vsprintf (msg_buf, format, args); - va_end (args); - - rl_display_prompt = msg_buf; - (*rl_redisplay_function) (); - return 0; -} -#else /* !USE_VARARGS */ -int -rl_message (format, arg1, arg2) - char *format; -{ - sprintf (msg_buf, format, arg1, arg2); - rl_display_prompt = msg_buf; - (*rl_redisplay_function) (); - return 0; -} -#endif /* !USE_VARARGS */ - -/* How to clear things from the "echo-area". */ -int -rl_clear_message () -{ - rl_display_prompt = rl_prompt; - (*rl_redisplay_function) (); - return 0; -} - -int -rl_reset_line_state () -{ - rl_on_new_line (); - - rl_display_prompt = rl_prompt ? rl_prompt : ""; - forced_display = 1; - return 0; -} - -static char *saved_local_prompt; -static char *saved_local_prefix; -static int saved_last_invisible; -static int saved_visible_length; - -void -_rl_save_prompt () -{ - saved_local_prompt = local_prompt; - saved_local_prefix = local_prompt_prefix; - saved_last_invisible = last_invisible; - saved_visible_length = visible_length; - - local_prompt = local_prompt_prefix = (char *)0; - last_invisible = visible_length = 0; -} - -void -_rl_restore_prompt () -{ - if (local_prompt) - free (local_prompt); - if (local_prompt_prefix) - free (local_prompt_prefix); - - local_prompt = saved_local_prompt; - local_prompt_prefix = saved_local_prefix; - last_invisible = saved_last_invisible; - visible_length = saved_visible_length; -} - -char * -_rl_make_prompt_for_search (pchar) - int pchar; -{ - int len; - char *pmt; - - _rl_save_prompt (); - - if (saved_local_prompt == 0) - { - len = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0; - pmt = xmalloc (len + 2); - if (len) - strcpy (pmt, rl_prompt); - pmt[len] = pchar; - pmt[len+1] = '\0'; - } - else - { - len = *saved_local_prompt ? strlen (saved_local_prompt) : 0; - pmt = xmalloc (len + 2); - if (len) - strcpy (pmt, saved_local_prompt); - pmt[len] = pchar; - pmt[len+1] = '\0'; - local_prompt = savestring (pmt); - last_invisible = saved_last_invisible; - visible_length = saved_visible_length + 1; - } - return pmt; -} - -/* Quick redisplay hack when erasing characters at the end of the line. */ -void -_rl_erase_at_end_of_line (l) - int l; -{ - register int i; - - _rl_backspace (l); - for (i = 0; i < l; i++) - putc (' ', rl_outstream); - _rl_backspace (l); - for (i = 0; i < l; i++) - visible_line[--_rl_last_c_pos] = '\0'; - rl_display_fixed++; -} - -/* Clear to the end of the line. COUNT is the minimum - number of character spaces to clear, */ -static void -clear_to_eol (count) - int count; -{ -#if !defined (__GO32__) - if (term_clreol) - { - tputs (term_clreol, 1, _rl_output_character_function); - } - else -#endif /* !__GO32__ */ - space_to_eol (count); -} - -/* Clear to the end of the line using spaces. COUNT is the minimum - number of character spaces to clear, */ -static void -space_to_eol (count) - int count; -{ - register int i; - - for (i = 0; i < count; i++) - putc (' ', rl_outstream); - - _rl_last_c_pos += count; -} - -/* Insert COUNT characters from STRING to the output stream. */ -static void -insert_some_chars (string, count) - char *string; - int count; -{ -#if defined (__GO32__) - int row, col, width; - char *row_start; - - ScreenGetCursor (&row, &col); - width = ScreenCols (); - row_start = ScreenPrimary + (row * width); - - memcpy (row_start + col + count, row_start + col, width - col - count); - - /* Place the text on the screen. */ - _rl_output_some_chars (string, count); -#else /* !_GO32 */ - - /* If IC is defined, then we do not have to "enter" insert mode. */ - if (term_IC) - { - char *buffer; - buffer = tgoto (term_IC, 0, count); - tputs (buffer, 1, _rl_output_character_function); - _rl_output_some_chars (string, count); - } - else - { - register int i; - - /* If we have to turn on insert-mode, then do so. */ - if (term_im && *term_im) - tputs (term_im, 1, _rl_output_character_function); - - /* If there is a special command for inserting characters, then - use that first to open up the space. */ - if (term_ic && *term_ic) - { - for (i = count; i--; ) - tputs (term_ic, 1, _rl_output_character_function); - } - - /* Print the text. */ - _rl_output_some_chars (string, count); - - /* If there is a string to turn off insert mode, we had best use - it now. */ - if (term_ei && *term_ei) - tputs (term_ei, 1, _rl_output_character_function); - } -#endif /* !__GO32__ */ -} - -/* Delete COUNT characters from the display line. */ -static void -delete_chars (count) - int count; -{ -#if defined (__GO32__) - int row, col, width; - char *row_start; - - ScreenGetCursor (&row, &col); - width = ScreenCols (); - row_start = ScreenPrimary + (row * width); - - memcpy (row_start + col, row_start + col + count, width - col - count); - memset (row_start + width - count, 0, count * 2); -#else /* !_GO32 */ - - if (count > screenwidth) /* XXX */ - return; - - if (term_DC && *term_DC) - { - char *buffer; - buffer = tgoto (term_DC, count, count); - tputs (buffer, count, _rl_output_character_function); - } - else - { - if (term_dc && *term_dc) - while (count--) - tputs (term_dc, 1, _rl_output_character_function); - } -#endif /* !__GO32__ */ -} - -void -_rl_update_final () -{ - int full_lines; - - full_lines = 0; - /* If the cursor is the only thing on an otherwise-blank last line, - compensate so we don't print an extra CRLF. */ - if (_rl_vis_botlin && _rl_last_c_pos == 0 && - visible_line[inv_lbreaks[_rl_vis_botlin]+1] == 0) - { - _rl_vis_botlin--; - full_lines = 1; - } - _rl_move_vert (_rl_vis_botlin); - /* If we've wrapped lines, remove the final xterm line-wrap flag. */ - if (full_lines && _rl_term_autowrap && (VIS_LLEN(_rl_vis_botlin) == screenwidth)) - { - char *last_line; - last_line = &visible_line[inv_lbreaks[_rl_vis_botlin]]; - _rl_move_cursor_relative (screenwidth - 1, last_line); - clear_to_eol (0); - putc (last_line[screenwidth - 1], rl_outstream); - } - _rl_vis_botlin = 0; - crlf (); - fflush (rl_outstream); - rl_display_fixed++; -} - -/* Move to the start of the current line. */ -static void -cr () -{ - if (term_cr) - { - tputs (term_cr, 1, _rl_output_character_function); - _rl_last_c_pos = 0; - } -} - -/* Redisplay the current line after a SIGWINCH is received. */ -void -_rl_redisplay_after_sigwinch () -{ - char *t, *oldp; - - /* Clear the current line and put the cursor at column 0. Make sure - the right thing happens if we have wrapped to a new screen line. */ - if (term_cr) - { - tputs (term_cr, 1, _rl_output_character_function); - _rl_last_c_pos = 0; - if (term_clreol) - tputs (term_clreol, 1, _rl_output_character_function); - else - { - space_to_eol (screenwidth); - tputs (term_cr, 1, _rl_output_character_function); - } - if (_rl_last_v_pos > 0) - _rl_move_vert (0); - } - else - crlf (); - - /* Redraw only the last line of a multi-line prompt. */ - t = strrchr (rl_display_prompt, '\n'); - if (t) - { - oldp = rl_display_prompt; - rl_display_prompt = ++t; - rl_forced_update_display (); - rl_display_prompt = oldp; - } - else - rl_forced_update_display (); -} - -void -_rl_clean_up_for_exit () -{ - if (readline_echoing_p) - { - _rl_move_vert (_rl_vis_botlin); - _rl_vis_botlin = 0; - fflush (rl_outstream); - rl_restart_output (); - } -} |