1
/* display.c -- readline redisplay facility. */
3
/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
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This file is part of the GNU Readline Library, a library for
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reading lines of text with interactive input and history editing.
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The GNU Readline Library is free software; you can redistribute it
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and/or modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 1, or
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(at your option) any later version.
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The GNU Readline Library is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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The GNU General Public License is often shipped with GNU software, and
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is generally kept in a file called COPYING or LICENSE. If you do not
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have a copy of the license, write to the Free Software Foundation,
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675 Mass Ave, Cambridge, MA 02139, USA. */
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#define READLINE_LIBRARY
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#if defined (HAVE_CONFIG_H)
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#include <sys/types.h>
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#if defined (HAVE_UNISTD_H)
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#endif /* HAVE_UNISTD_H */
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#include "posixstat.h"
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#if defined (HAVE_STDLIB_H)
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# include "ansi_stdlib.h"
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#endif /* HAVE_STDLIB_H */
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#if defined (__GO32__)
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/* System-specific feature definitions and include files. */
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/* Termcap library stuff. */
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/* Some standard library routines. */
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#if !defined (strchr) && !defined (__STDC__)
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extern char *strchr (), *strrchr ();
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#endif /* !strchr && !__STDC__ */
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/* Global and pseudo-global variables and functions
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imported from readline.c. */
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extern char *rl_prompt;
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extern int readline_echoing_p;
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extern int _rl_output_meta_chars;
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extern int _rl_horizontal_scroll_mode;
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extern int _rl_mark_modified_lines;
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extern int _rl_prefer_visible_bell;
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/* Variables and functions imported from terminal.c */
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extern void _rl_output_some_chars ();
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extern void _rl_output_character_function ();
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extern int _rl_output_character_function ();
80
extern int _rl_backspace ();
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extern char *term_clreol, *term_clrpag;
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extern char *term_im, *term_ic, *term_ei, *term_DC;
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extern char *term_up, *term_dc, *term_cr, *term_IC;
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extern int screenheight, screenwidth, screenchars;
86
extern int terminal_can_insert, _rl_term_autowrap;
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/* Pseudo-global functions (local to the readline library) exported
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void _rl_move_cursor_relative (), _rl_output_some_chars ();
91
void _rl_move_vert ();
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void _rl_clear_to_eol (), _rl_clear_screen ();
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static void update_line (), space_to_eol ();
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static void delete_chars (), insert_some_chars ();
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static int *inv_lbreaks, *vis_lbreaks;
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extern char *xmalloc (), *xrealloc ();
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/* Heuristic used to decide whether it is faster to move from CUR to NEW
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by backing up or outputting a carriage return and moving forward. */
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#define CR_FASTER(new, cur) (((new) + 1) < ((cur) - (new)))
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/* **************************************************************** */
110
/* **************************************************************** */
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/* This is the stuff that is hard for me. I never seem to write good
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display routines in C. Let's see how I do this time. */
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/* (PWP) Well... Good for a simple line updater, but totally ignores
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the problems of input lines longer than the screen width.
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update_line and the code that calls it makes a multiple line,
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automatically wrapping line update. Careful attention needs
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to be paid to the vertical position variables. */
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/* Keep two buffers; one which reflects the current contents of the
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screen, and the other to draw what we think the new contents should
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be. Then compare the buffers, and make whatever changes to the
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screen itself that we should. Finally, make the buffer that we
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just drew into be the one which reflects the current contents of the
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screen, and place the cursor where it belongs.
129
Commands that want to can fix the display themselves, and then let
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this function know that the display has been fixed by setting the
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RL_DISPLAY_FIXED variable. This is good for efficiency. */
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/* Application-specific redisplay function. */
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VFunction *rl_redisplay_function = rl_redisplay;
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/* Global variables declared here. */
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/* What YOU turn on when you have handled all redisplay yourself. */
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int rl_display_fixed = 0;
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int _rl_suppress_redisplay = 0;
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/* The stuff that gets printed out before the actual text of the line.
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This is usually pointing to rl_prompt. */
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char *rl_display_prompt = (char *)NULL;
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/* Pseudo-global variables declared here. */
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/* The visible cursor position. If you print some text, adjust this. */
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int _rl_last_c_pos = 0;
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int _rl_last_v_pos = 0;
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/* Number of lines currently on screen minus 1. */
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int _rl_vis_botlin = 0;
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/* Variables used only in this file. */
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/* The last left edge of text that was displayed. This is used when
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doing horizontal scrolling. It shifts in thirds of a screenwidth. */
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static int last_lmargin;
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/* The line display buffers. One is the line currently displayed on
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the screen. The other is the line about to be displayed. */
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static char *visible_line = (char *)NULL;
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static char *invisible_line = (char *)NULL;
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/* A buffer for `modeline' messages. */
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static char msg_buf[128];
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/* Non-zero forces the redisplay even if we thought it was unnecessary. */
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static int forced_display;
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/* Default and initial buffer size. Can grow. */
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static int line_size = 1024;
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static char *local_prompt, *local_prompt_prefix;
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static int visible_length, prefix_length;
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/* The number of invisible characters in the line currently being
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displayed on the screen. */
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static int visible_wrap_offset;
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/* static so it can be shared between rl_redisplay and update_line */
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static int wrap_offset;
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/* The index of the last invisible_character in the prompt string. */
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static int last_invisible;
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/* The length (buffer offset) of the first line of the last (possibly
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multi-line) buffer displayed on the screen. */
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static int visible_first_line_len;
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/* Expand the prompt string S and return the number of visible
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characters in *LP, if LP is not null. This is currently more-or-less
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a placeholder for expansion. LIP, if non-null is a place to store the
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index of the last invisible character in ther eturned string. */
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/* Current implementation:
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\001 (^A) start non-visible characters
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\002 (^B) end non-visible characters
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all characters except \001 and \002 (following a \001) are copied to
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the returned string; all characters except those between \001 and
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\002 are assumed to be `visible'. */
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expand_prompt (pmt, lp, lip)
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int l, rl, last, ignoring;
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/* Short-circuit if we can. */
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if (strchr (pmt, RL_PROMPT_START_IGNORE) == 0)
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r = savestring (pmt);
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r = ret = xmalloc (l + 1);
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for (rl = ignoring = last = 0, p = pmt; p && *p; p++)
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/* This code strips the invisible character string markers
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RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */
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if (*p == RL_PROMPT_START_IGNORE)
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else if (ignoring && *p == RL_PROMPT_END_IGNORE)
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* Expand the prompt string into the various display components, if
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* local_prompt = expanded last line of string in rl_display_prompt
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* (portion after the final newline)
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* local_prompt_prefix = portion before last newline of rl_display_prompt,
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* expanded via expand_prompt
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* visible_length = number of visible characters in local_prompt
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* prefix_length = number of visible characters in local_prompt_prefix
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* This function is called once per call to readline(). It may also be
265
* called arbitrarily to expand the primary prompt.
267
* The return value is the number of visible characters on the last line
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* of the (possibly multi-line) prompt.
271
rl_expand_prompt (prompt)
277
/* Clear out any saved values. */
280
if (local_prompt_prefix)
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free (local_prompt_prefix);
282
local_prompt = local_prompt_prefix = (char *)0;
283
last_invisible = visible_length = 0;
285
if (prompt == 0 || *prompt == 0)
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p = strrchr (prompt, '\n');
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/* The prompt is only one line. */
292
local_prompt = expand_prompt (prompt, &visible_length, &last_invisible);
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local_prompt_prefix = (char *)0;
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return (visible_length);
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/* The prompt spans multiple lines. */
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local_prompt = expand_prompt (p, &visible_length, &last_invisible);
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/* The portion of the prompt string up to and including the
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final newline is now null-terminated. */
304
local_prompt_prefix = expand_prompt (prompt, &prefix_length, (int *)NULL);
306
return (prefix_length);
310
/* Basic redisplay algorithm. */
314
register int in, out, c, linenum, cursor_linenum;
316
int c_pos, inv_botlin, lb_botlin, lb_linenum;
317
int newlines, lpos, temp;
318
char *prompt_this_line;
320
if (!readline_echoing_p)
323
if (!rl_display_prompt)
324
rl_display_prompt = "";
326
if (invisible_line == 0)
328
visible_line = xmalloc (line_size);
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invisible_line = xmalloc (line_size);
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for (in = 0; in < line_size; in++)
332
visible_line[in] = 0;
333
invisible_line[in] = 1;
336
/* should be enough, but then again, this is just for testing. */
337
inv_lbreaks = (int *)malloc (256 * sizeof (int));
338
vis_lbreaks = (int *)malloc (256 * sizeof (int));
339
inv_lbreaks[0] = vis_lbreaks[0] = 0;
344
/* Draw the line into the buffer. */
347
line = invisible_line;
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out = inv_botlin = 0;
350
/* Mark the line as modified or not. We only do this for history
352
if (_rl_mark_modified_lines && current_history () && rl_undo_list)
358
/* If someone thought that the redisplay was handled, but the currently
359
visible line has a different modification state than the one about
360
to become visible, then correct the caller's misconception. */
361
if (visible_line[0] != invisible_line[0])
362
rl_display_fixed = 0;
364
/* If the prompt to be displayed is the `primary' readline prompt (the
365
one passed to readline()), use the values we have already expanded.
366
If not, use what's already in rl_display_prompt. WRAP_OFFSET is the
367
number of non-visible characters in the prompt string. */
368
if (rl_display_prompt == rl_prompt || local_prompt)
370
int local_len = local_prompt ? strlen (local_prompt) : 0;
371
if (local_prompt_prefix && forced_display)
372
_rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix));
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temp = local_len + out + 2;
377
if (temp >= line_size)
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line_size = (temp + 1024) - (temp % 1024);
380
visible_line = xrealloc (visible_line, line_size);
381
line = invisible_line = xrealloc (invisible_line, line_size);
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strncpy (line + out, local_prompt, local_len);
387
wrap_offset = local_len - visible_length;
392
prompt_this_line = strrchr (rl_display_prompt, '\n');
393
if (!prompt_this_line)
394
prompt_this_line = rl_display_prompt;
400
_rl_output_some_chars (rl_display_prompt, prompt_this_line - rl_display_prompt);
401
/* Make sure we are at column zero even after a newline,
402
regardless of the state of terminal output processing. */
403
if (prompt_this_line[-2] != '\r')
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pmtlen = strlen (prompt_this_line);
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temp = pmtlen + out + 2;
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if (temp >= line_size)
412
line_size = (temp + 1024) - (temp % 1024);
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visible_line = xrealloc (visible_line, line_size);
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line = invisible_line = xrealloc (invisible_line, line_size);
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strncpy (line + out, prompt_this_line, pmtlen);
422
#define CHECK_LPOS() \
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if (lpos >= screenwidth) \
427
inv_lbreaks[++newlines] = out; \
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/* inv_lbreaks[i] is where line i starts in the buffer. */
433
inv_lbreaks[newlines = 0] = 0;
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lpos = out - wrap_offset;
436
/* XXX - what if lpos is already >= screenwidth before we start drawing the
437
contents of the command line? */
438
while (lpos >= screenwidth)
441
temp = ((newlines + 1) * screenwidth) - ((newlines == 0) ? wrap_offset : 0);
443
/* XXX - possible fix from Darin Johnson <darin@acuson.com> for prompt
444
string with invisible characters that is longer than the screen
446
temp = ((newlines + 1) * screenwidth) + ((newlines == 0) ? wrap_offset : 0);
448
inv_lbreaks[++newlines] = temp;
453
for (in = 0; in < rl_end; in++)
455
c = (unsigned char)rl_line_buffer[in];
457
if (out + 8 >= line_size) /* XXX - 8 for \t */
460
visible_line = xrealloc (visible_line, line_size);
461
invisible_line = xrealloc (invisible_line, line_size);
462
line = invisible_line;
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lb_linenum = newlines;
473
if (_rl_output_meta_chars == 0)
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sprintf (line + out, "\\%o", c);
477
if (lpos + 4 >= screenwidth)
479
temp = screenwidth - lpos;
480
inv_lbreaks[++newlines] = out + temp;
494
#if defined (DISPLAY_TABS)
497
register int temp, newout;
500
newout = (out | (int)7) + 1;
502
newout = out + 8 - lpos % 8;
505
if (lpos + temp >= screenwidth)
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temp2 = screenwidth - lpos;
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inv_lbreaks[++newlines] = out + temp2;
522
else if (c == '\n' && _rl_horizontal_scroll_mode == 0 && term_up && *term_up)
524
line[out++] = '\0'; /* XXX - sentinel */
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inv_lbreaks[++newlines] = out;
528
else if (CTRL_CHAR (c) || c == RUBOUT)
532
line[out++] = CTRL_CHAR (c) ? UNCTRL (c) : '?';
545
lb_linenum = newlines;
548
inv_botlin = lb_botlin = newlines;
549
inv_lbreaks[newlines+1] = out;
550
cursor_linenum = lb_linenum;
552
/* C_POS == position in buffer where cursor should be placed. */
554
/* PWP: now is when things get a bit hairy. The visible and invisible
555
line buffers are really multiple lines, which would wrap every
556
(screenwidth - 1) characters. Go through each in turn, finding
557
the changed region and updating it. The line order is top to bottom. */
559
/* If we can move the cursor up and down, then use multiple lines,
560
otherwise, let long lines display in a single terminal line, and
561
horizontally scroll it. */
563
if (_rl_horizontal_scroll_mode == 0 && term_up && *term_up)
565
int nleft, pos, changed_screen_line;
567
if (!rl_display_fixed || forced_display)
571
/* If we have more than a screenful of material to display, then
572
only display a screenful. We should display the last screen,
574
if (out >= screenchars)
575
out = screenchars - 1;
577
/* The first line is at character position 0 in the buffer. The
578
second and subsequent lines start at inv_lbreaks[N], offset by
579
OFFSET (which has already been calculated above). */
581
#define W_OFFSET(line, offset) ((line) == 0 ? offset : 0)
582
#define VIS_LLEN(l) ((l) > _rl_vis_botlin ? 0 : (vis_lbreaks[l+1] - vis_lbreaks[l]))
583
#define INV_LLEN(l) (inv_lbreaks[l+1] - inv_lbreaks[l])
584
#define VIS_CHARS(line) (visible_line + vis_lbreaks[line])
585
#define VIS_LINE(line) ((line) > _rl_vis_botlin) ? "" : VIS_CHARS(line)
586
#define INV_LINE(line) (invisible_line + inv_lbreaks[line])
588
/* For each line in the buffer, do the updating display. */
589
for (linenum = 0; linenum <= inv_botlin; linenum++)
591
update_line (VIS_LINE(linenum), INV_LINE(linenum), linenum,
592
VIS_LLEN(linenum), INV_LLEN(linenum), inv_botlin);
594
/* If this is the line with the prompt, we might need to
595
compensate for invisible characters in the new line. Do
596
this only if there is not more than one new line (which
597
implies that we completely overwrite the old visible line)
598
and the new line is shorter than the old. Make sure we are
599
at the end of the new line before clearing. */
601
inv_botlin == 0 && _rl_last_c_pos == out &&
602
(wrap_offset > visible_wrap_offset) &&
603
(_rl_last_c_pos < visible_first_line_len))
605
nleft = screenwidth + wrap_offset - _rl_last_c_pos;
607
_rl_clear_to_eol (nleft);
610
/* Since the new first line is now visible, save its length. */
612
visible_first_line_len = (inv_botlin > 0) ? inv_lbreaks[1] : out - wrap_offset;
615
/* We may have deleted some lines. If so, clear the left over
616
blank ones at the bottom out. */
617
if (_rl_vis_botlin > inv_botlin)
620
for (; linenum <= _rl_vis_botlin; linenum++)
622
tt = VIS_CHARS (linenum);
623
_rl_move_vert (linenum);
624
_rl_move_cursor_relative (0, tt);
626
((linenum == _rl_vis_botlin) ? strlen (tt) : screenwidth);
629
_rl_vis_botlin = inv_botlin;
631
/* CHANGED_SCREEN_LINE is set to 1 if we have moved to a
632
different screen line during this redisplay. */
633
changed_screen_line = _rl_last_v_pos != cursor_linenum;
634
if (changed_screen_line)
636
_rl_move_vert (cursor_linenum);
637
/* If we moved up to the line with the prompt using term_up,
638
the physical cursor position on the screen stays the same,
639
but the buffer position needs to be adjusted to account
640
for invisible characters. */
641
if (cursor_linenum == 0 && wrap_offset)
642
_rl_last_c_pos += wrap_offset;
645
/* We have to reprint the prompt if it contains invisible
646
characters, since it's not generally OK to just reprint
647
the characters from the current cursor position. But we
648
only need to reprint it if the cursor is before the last
649
invisible character in the prompt string. */
650
nleft = visible_length + wrap_offset;
651
if (cursor_linenum == 0 && wrap_offset > 0 && _rl_last_c_pos > 0 &&
652
_rl_last_c_pos <= last_invisible && local_prompt)
655
tputs (term_cr, 1, _rl_output_character_function);
656
_rl_output_some_chars (local_prompt, nleft);
657
_rl_last_c_pos = nleft;
660
/* Where on that line? And where does that line start
662
pos = inv_lbreaks[cursor_linenum];
663
/* nleft == number of characters in the line buffer between the
664
start of the line and the cursor position. */
667
/* Since _rl_backspace() doesn't know about invisible characters in the
668
prompt, and there's no good way to tell it, we compensate for
669
those characters here and call _rl_backspace() directly. */
670
if (wrap_offset && cursor_linenum == 0 && nleft < _rl_last_c_pos)
672
_rl_backspace (_rl_last_c_pos - nleft);
673
_rl_last_c_pos = nleft;
676
if (nleft != _rl_last_c_pos)
677
_rl_move_cursor_relative (nleft, &invisible_line[pos]);
680
else /* Do horizontal scrolling. */
682
#define M_OFFSET(margin, offset) ((margin) == 0 ? offset : 0)
683
int lmargin, ndisp, nleft, phys_c_pos, t;
685
/* Always at top line. */
688
/* Compute where in the buffer the displayed line should start. This
691
/* The number of characters that will be displayed before the cursor. */
692
ndisp = c_pos - wrap_offset;
693
nleft = visible_length + wrap_offset;
694
/* Where the new cursor position will be on the screen. This can be
695
longer than SCREENWIDTH; if it is, lmargin will be adjusted. */
696
phys_c_pos = c_pos - (last_lmargin ? last_lmargin : wrap_offset);
699
/* If the number of characters had already exceeded the screenwidth,
700
last_lmargin will be > 0. */
702
/* If the number of characters to be displayed is more than the screen
703
width, compute the starting offset so that the cursor is about
704
two-thirds of the way across the screen. */
705
if (phys_c_pos > screenwidth - 2)
707
lmargin = c_pos - (2 * t);
710
/* If the left margin would be in the middle of a prompt with
711
invisible characters, don't display the prompt at all. */
712
if (wrap_offset && lmargin > 0 && lmargin < nleft)
715
else if (ndisp < screenwidth - 2) /* XXX - was -1 */
717
else if (phys_c_pos < 1)
719
/* If we are moving back towards the beginning of the line and
720
the last margin is no longer correct, compute a new one. */
721
lmargin = ((c_pos - 1) / t) * t; /* XXX */
722
if (wrap_offset && lmargin > 0 && lmargin < nleft)
726
lmargin = last_lmargin;
728
/* If the first character on the screen isn't the first character
729
in the display line, indicate this with a special character. */
733
/* If SCREENWIDTH characters starting at LMARGIN do not encompass
734
the whole line, indicate that with a special character at the
735
right edge of the screen. If LMARGIN is 0, we need to take the
736
wrap offset into account. */
737
t = lmargin + M_OFFSET (lmargin, wrap_offset) + screenwidth;
741
if (!rl_display_fixed || forced_display || lmargin != last_lmargin)
744
update_line (&visible_line[last_lmargin],
745
&invisible_line[lmargin],
747
screenwidth + visible_wrap_offset,
748
screenwidth + (lmargin ? 0 : wrap_offset),
751
/* If the visible new line is shorter than the old, but the number
752
of invisible characters is greater, and we are at the end of
753
the new line, we need to clear to eol. */
754
t = _rl_last_c_pos - M_OFFSET (lmargin, wrap_offset);
755
if ((M_OFFSET (lmargin, wrap_offset) > visible_wrap_offset) &&
756
(_rl_last_c_pos == out) &&
757
t < visible_first_line_len)
759
nleft = screenwidth - t;
760
_rl_clear_to_eol (nleft);
762
visible_first_line_len = out - lmargin - M_OFFSET (lmargin, wrap_offset);
763
if (visible_first_line_len > screenwidth)
764
visible_first_line_len = screenwidth;
766
_rl_move_cursor_relative (c_pos - lmargin, &invisible_line[lmargin]);
767
last_lmargin = lmargin;
770
fflush (rl_outstream);
772
/* Swap visible and non-visible lines. */
774
char *temp = visible_line;
775
int *itemp = vis_lbreaks;
776
visible_line = invisible_line;
777
invisible_line = temp;
778
vis_lbreaks = inv_lbreaks;
780
rl_display_fixed = 0;
781
/* If we are displaying on a single line, and last_lmargin is > 0, we
782
are not displaying any invisible characters, so set visible_wrap_offset
784
if (_rl_horizontal_scroll_mode && last_lmargin)
785
visible_wrap_offset = 0;
787
visible_wrap_offset = wrap_offset;
791
/* PWP: update_line() is based on finding the middle difference of each
792
line on the screen; vis:
794
/old first difference
795
/beginning of line | /old last same /old EOL
797
old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as
798
new: eddie> Oh, my little buggy says to me, as lurgid as
800
\beginning of line | \new last same \new end of line
801
\new first difference
803
All are character pointers for the sake of speed. Special cases for
804
no differences, as well as for end of line additions must be handled.
806
Could be made even smarter, but this works well enough */
808
update_line (old, new, current_line, omax, nmax, inv_botlin)
809
register char *old, *new;
810
int current_line, omax, nmax, inv_botlin;
812
register char *ofd, *ols, *oe, *nfd, *nls, *ne;
813
int temp, lendiff, wsatend, od, nd;
814
int current_invis_chars;
816
/* If we're at the right edge of a terminal that supports xn, we're
817
ready to wrap around, so do so. This fixes problems with knowing
818
the exact cursor position and cut-and-paste with certain terminal
819
emulators. In this calculation, TEMP is the physical screen
820
position of the cursor. */
821
temp = _rl_last_c_pos - W_OFFSET(_rl_last_v_pos, visible_wrap_offset);
822
if (temp == screenwidth && _rl_term_autowrap && !_rl_horizontal_scroll_mode
823
&& _rl_last_v_pos == current_line - 1)
826
putc (new[0], rl_outstream);
828
putc (' ', rl_outstream);
829
_rl_last_c_pos = 1; /* XXX */
831
if (old[0] && new[0])
835
/* Find first difference. */
836
for (ofd = old, nfd = new;
837
(ofd - old < omax) && *ofd && (*ofd == *nfd);
841
/* Move to the end of the screen line. ND and OD are used to keep track
842
of the distance between ne and new and oe and old, respectively, to
843
move a subtraction out of each loop. */
844
for (od = ofd - old, oe = ofd; od < omax && *oe; oe++, od++);
845
for (nd = nfd - new, ne = nfd; nd < nmax && *ne; ne++, nd++);
847
/* If no difference, continue to next line. */
848
if (ofd == oe && nfd == ne)
851
wsatend = 1; /* flag for trailing whitespace */
852
ols = oe - 1; /* find last same */
854
while ((ols > ofd) && (nls > nfd) && (*ols == *nls))
867
else if (*ols != *nls)
869
if (*ols) /* don't step past the NUL */
875
/* count of invisible characters in the current invisible line. */
876
current_invis_chars = W_OFFSET (current_line, wrap_offset);
877
if (_rl_last_v_pos != current_line)
879
_rl_move_vert (current_line);
880
if (current_line == 0 && visible_wrap_offset)
881
_rl_last_c_pos += visible_wrap_offset;
884
/* If this is the first line and there are invisible characters in the
885
prompt string, and the prompt string has not changed, and the current
886
cursor position is before the last invisible character in the prompt,
887
and the index of the character to move to is past the end of the prompt
888
string, then redraw the entire prompt string. We can only do this
889
reliably if the terminal supports a `cr' capability.
891
This is not an efficiency hack -- there is a problem with redrawing
892
portions of the prompt string if they contain terminal escape
893
sequences (like drawing the `unbold' sequence without a corresponding
894
`bold') that manifests itself on certain terminals. */
896
lendiff = local_prompt ? strlen (local_prompt) : 0;
897
od = ofd - old; /* index of first difference in visible line */
898
if (current_line == 0 && !_rl_horizontal_scroll_mode &&
899
term_cr && lendiff > visible_length && _rl_last_c_pos > 0 &&
900
od > lendiff && _rl_last_c_pos < last_invisible)
902
tputs (term_cr, 1, _rl_output_character_function);
903
_rl_output_some_chars (local_prompt, lendiff);
904
_rl_last_c_pos = lendiff;
907
_rl_move_cursor_relative (od, old);
909
/* if (len (new) > len (old)) */
910
lendiff = (nls - nfd) - (ols - ofd);
912
/* If we are changing the number of invisible characters in a line, and
913
the spot of first difference is before the end of the invisible chars,
914
lendiff needs to be adjusted. */
915
if (current_line == 0 && !_rl_horizontal_scroll_mode &&
916
current_invis_chars != visible_wrap_offset)
917
lendiff += visible_wrap_offset - current_invis_chars;
919
/* Insert (diff (len (old), len (new)) ch. */
923
/* Non-zero if we're increasing the number of lines. */
924
int gl = current_line >= _rl_vis_botlin && inv_botlin > _rl_vis_botlin;
925
/* Sometimes it is cheaper to print the characters rather than
926
use the terminal's capabilities. If we're growing the number
927
of lines, make sure we actually cause the new line to wrap
928
around on auto-wrapping terminals. */
929
if (terminal_can_insert && ((2 * temp) >= lendiff || term_IC) && (!_rl_term_autowrap || !gl))
931
/* If lendiff > visible_length and _rl_last_c_pos == 0 and
932
_rl_horizontal_scroll_mode == 1, inserting the characters with
933
term_IC or term_ic will screw up the screen because of the
934
invisible characters. We need to just draw them. */
935
if (*ols && (!_rl_horizontal_scroll_mode || _rl_last_c_pos > 0 ||
936
lendiff <= visible_length || !current_invis_chars))
938
insert_some_chars (nfd, lendiff);
939
_rl_last_c_pos += lendiff;
943
/* At the end of a line the characters do not have to
944
be "inserted". They can just be placed on the screen. */
945
/* However, this screws up the rest of this block, which
946
assumes you've done the insert because you can. */
947
_rl_output_some_chars (nfd, lendiff);
948
_rl_last_c_pos += lendiff;
952
/* We have horizontal scrolling and we are not inserting at
953
the end. We have invisible characters in this line. This
955
_rl_output_some_chars (nfd, temp);
956
_rl_last_c_pos += temp;
959
/* Copy (new) chars to screen from first diff to last match. */
961
if ((temp - lendiff) > 0)
963
_rl_output_some_chars (nfd + lendiff, temp - lendiff);
964
_rl_last_c_pos += temp - lendiff;
969
/* cannot insert chars, write to EOL */
970
_rl_output_some_chars (nfd, temp);
971
_rl_last_c_pos += temp;
974
else /* Delete characters from line. */
976
/* If possible and inexpensive to use terminal deletion, then do so. */
977
if (term_dc && (2 * temp) >= -lendiff)
979
/* If all we're doing is erasing the invisible characters in the
980
prompt string, don't bother. It screws up the assumptions
981
about what's on the screen. */
982
if (_rl_horizontal_scroll_mode && _rl_last_c_pos == 0 &&
983
-lendiff == visible_wrap_offset)
987
delete_chars (-lendiff); /* delete (diff) characters */
989
/* Copy (new) chars to screen from first diff to last match */
993
_rl_output_some_chars (nfd, temp);
994
_rl_last_c_pos += temp;
997
/* Otherwise, print over the existing material. */
1002
_rl_output_some_chars (nfd, temp);
1003
_rl_last_c_pos += temp;
1005
lendiff = (oe - old) - (ne - new);
1008
if (_rl_term_autowrap && current_line < inv_botlin)
1009
space_to_eol (lendiff);
1011
_rl_clear_to_eol (lendiff);
1017
/* Tell the update routines that we have moved onto a new (empty) line. */
1022
visible_line[0] = '\0';
1024
_rl_last_c_pos = _rl_last_v_pos = 0;
1025
_rl_vis_botlin = last_lmargin = 0;
1027
vis_lbreaks[0] = vis_lbreaks[1] = 0;
1028
visible_wrap_offset = 0;
1032
/* Actually update the display, period. */
1034
rl_forced_update_display ()
1038
register char *temp = visible_line;
1045
(*rl_redisplay_function) ();
1049
/* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices.
1050
DATA is the contents of the screen line of interest; i.e., where
1051
the movement is being done. */
1053
_rl_move_cursor_relative (new, data)
1059
/* If we don't have to do anything, then return. */
1060
if (_rl_last_c_pos == new) return;
1062
/* It may be faster to output a CR, and then move forwards instead
1063
of moving backwards. */
1064
/* i == current physical cursor position. */
1065
i = _rl_last_c_pos - W_OFFSET(_rl_last_v_pos, visible_wrap_offset);
1066
if (new == 0 || CR_FASTER (new, _rl_last_c_pos) ||
1067
(_rl_term_autowrap && i == screenwidth))
1069
#if defined (__MSDOS__)
1070
putc ('\r', rl_outstream);
1072
tputs (term_cr, 1, _rl_output_character_function);
1073
#endif /* !__MSDOS__ */
1077
if (_rl_last_c_pos < new)
1079
/* Move the cursor forward. We do it by printing the command
1080
to move the cursor forward if there is one, else print that
1081
portion of the output buffer again. Which is cheaper? */
1083
/* The above comment is left here for posterity. It is faster
1084
to print one character (non-control) than to print a control
1085
sequence telling the terminal to move forward one character.
1086
That kind of control is for people who don't know what the
1087
data is underneath the cursor. */
1088
#if defined (HACK_TERMCAP_MOTION)
1089
extern char *term_forward_char;
1091
if (term_forward_char)
1092
for (i = _rl_last_c_pos; i < new; i++)
1093
tputs (term_forward_char, 1, _rl_output_character_function);
1095
for (i = _rl_last_c_pos; i < new; i++)
1096
putc (data[i], rl_outstream);
1098
for (i = _rl_last_c_pos; i < new; i++)
1099
putc (data[i], rl_outstream);
1100
#endif /* HACK_TERMCAP_MOTION */
1102
else if (_rl_last_c_pos > new)
1103
_rl_backspace (_rl_last_c_pos - new);
1104
_rl_last_c_pos = new;
1107
/* PWP: move the cursor up or down. */
1112
register int delta, i;
1114
if (_rl_last_v_pos == to || to > screenheight)
1117
#if defined (__GO32__)
1121
ScreenGetCursor (&row, &col);
1122
ScreenSetCursor ((row + to - _rl_last_v_pos), col);
1124
#else /* !__GO32__ */
1126
if ((delta = to - _rl_last_v_pos) > 0)
1128
for (i = 0; i < delta; i++)
1129
putc ('\n', rl_outstream);
1130
tputs (term_cr, 1, _rl_output_character_function);
1135
if (term_up && *term_up)
1136
for (i = 0; i < -delta; i++)
1137
tputs (term_up, 1, _rl_output_character_function);
1139
#endif /* !__GO32__ */
1140
_rl_last_v_pos = to; /* Now TO is here */
1143
/* Physically print C on rl_outstream. This is for functions which know
1144
how to optimize the display. Return the number of characters output. */
1150
if (META_CHAR (c) && (_rl_output_meta_chars == 0))
1152
fprintf (rl_outstream, "M-");
1157
#if defined (DISPLAY_TABS)
1158
if ((CTRL_CHAR (c) && c != '\t') || c == RUBOUT)
1160
if (CTRL_CHAR (c) || c == RUBOUT)
1161
#endif /* !DISPLAY_TABS */
1163
fprintf (rl_outstream, "C-");
1165
c = CTRL_CHAR (c) ? UNCTRL (c) : '?';
1168
putc (c, rl_outstream);
1169
fflush (rl_outstream);
1174
rl_character_len (c, pos)
1175
register int c, pos;
1179
uc = (unsigned char)c;
1182
return ((_rl_output_meta_chars == 0) ? 4 : 1);
1186
#if defined (DISPLAY_TABS)
1187
return (((pos | 7) + 1) - pos);
1190
#endif /* !DISPLAY_TABS */
1193
if (CTRL_CHAR (c) || c == RUBOUT)
1196
return ((isprint (uc)) ? 1 : 2);
1199
/* How to print things in the "echo-area". The prompt is treated as a
1202
#if defined (USE_VARARGS)
1204
#if defined (PREFER_STDARG)
1205
rl_message (const char *format, ...)
1207
rl_message (va_alist)
1212
#if defined (PREFER_VARARGS)
1216
#if defined (PREFER_STDARG)
1217
va_start (args, format);
1220
format = va_arg (args, char *);
1223
vsprintf (msg_buf, format, args);
1226
rl_display_prompt = msg_buf;
1227
(*rl_redisplay_function) ();
1230
#else /* !USE_VARARGS */
1232
rl_message (format, arg1, arg2)
1235
sprintf (msg_buf, format, arg1, arg2);
1236
rl_display_prompt = msg_buf;
1237
(*rl_redisplay_function) ();
1240
#endif /* !USE_VARARGS */
1242
/* How to clear things from the "echo-area". */
1246
rl_display_prompt = rl_prompt;
1247
(*rl_redisplay_function) ();
1252
rl_reset_line_state ()
1256
rl_display_prompt = rl_prompt ? rl_prompt : "";
1261
static char *saved_local_prompt;
1262
static char *saved_local_prefix;
1263
static int saved_last_invisible;
1264
static int saved_visible_length;
1269
saved_local_prompt = local_prompt;
1270
saved_local_prefix = local_prompt_prefix;
1271
saved_last_invisible = last_invisible;
1272
saved_visible_length = visible_length;
1274
local_prompt = local_prompt_prefix = (char *)0;
1275
last_invisible = visible_length = 0;
1279
rl_restore_prompt ()
1282
free (local_prompt);
1283
if (local_prompt_prefix)
1284
free (local_prompt_prefix);
1286
local_prompt = saved_local_prompt;
1287
local_prompt_prefix = saved_local_prefix;
1288
last_invisible = saved_last_invisible;
1289
visible_length = saved_visible_length;
1293
_rl_make_prompt_for_search (pchar)
1301
if (saved_local_prompt == 0)
1303
len = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0;
1304
pmt = xmalloc (len + 2);
1306
strcpy (pmt, rl_prompt);
1312
len = *saved_local_prompt ? strlen (saved_local_prompt) : 0;
1313
pmt = xmalloc (len + 2);
1315
strcpy (pmt, saved_local_prompt);
1318
local_prompt = savestring (pmt);
1319
last_invisible = saved_last_invisible;
1320
visible_length = saved_visible_length + 1;
1325
/* Quick redisplay hack when erasing characters at the end of the line. */
1327
_rl_erase_at_end_of_line (l)
1333
for (i = 0; i < l; i++)
1334
putc (' ', rl_outstream);
1336
for (i = 0; i < l; i++)
1337
visible_line[--_rl_last_c_pos] = '\0';
1341
/* Clear to the end of the line. COUNT is the minimum
1342
number of character spaces to clear, */
1344
_rl_clear_to_eol (count)
1347
#if !defined (__GO32__)
1349
tputs (term_clreol, 1, _rl_output_character_function);
1351
#endif /* !__GO32__ */
1352
space_to_eol (count);
1355
/* Clear to the end of the line using spaces. COUNT is the minimum
1356
number of character spaces to clear, */
1358
space_to_eol (count)
1363
for (i = 0; i < count; i++)
1364
putc (' ', rl_outstream);
1366
_rl_last_c_pos += count;
1372
#if !defined (__GO32__)
1374
tputs (term_clrpag, 1, _rl_output_character_function);
1376
#endif /* !__GO32__ */
1380
/* Insert COUNT characters from STRING to the output stream. */
1382
insert_some_chars (string, count)
1386
#if defined (__GO32__)
1387
int row, col, width;
1390
ScreenGetCursor (&row, &col);
1391
width = ScreenCols ();
1392
row_start = ScreenPrimary + (row * width);
1394
memcpy (row_start + col + count, row_start + col, width - col - count);
1396
/* Place the text on the screen. */
1397
_rl_output_some_chars (string, count);
1400
/* If IC is defined, then we do not have to "enter" insert mode. */
1404
buffer = tgoto (term_IC, 0, count);
1405
tputs (buffer, 1, _rl_output_character_function);
1406
_rl_output_some_chars (string, count);
1412
/* If we have to turn on insert-mode, then do so. */
1413
if (term_im && *term_im)
1414
tputs (term_im, 1, _rl_output_character_function);
1416
/* If there is a special command for inserting characters, then
1417
use that first to open up the space. */
1418
if (term_ic && *term_ic)
1420
for (i = count; i--; )
1421
tputs (term_ic, 1, _rl_output_character_function);
1424
/* Print the text. */
1425
_rl_output_some_chars (string, count);
1427
/* If there is a string to turn off insert mode, we had best use
1429
if (term_ei && *term_ei)
1430
tputs (term_ei, 1, _rl_output_character_function);
1432
#endif /* !__GO32__ */
1435
/* Delete COUNT characters from the display line. */
1437
delete_chars (count)
1440
#if defined (__GO32__)
1441
int row, col, width;
1444
ScreenGetCursor (&row, &col);
1445
width = ScreenCols ();
1446
row_start = ScreenPrimary + (row * width);
1448
memcpy (row_start + col, row_start + col + count, width - col - count);
1449
memset (row_start + width - count, 0, count * 2);
1452
if (count > screenwidth) /* XXX */
1455
if (term_DC && *term_DC)
1458
buffer = tgoto (term_DC, count, count);
1459
tputs (buffer, count, _rl_output_character_function);
1463
if (term_dc && *term_dc)
1465
tputs (term_dc, 1, _rl_output_character_function);
1467
#endif /* !__GO32__ */
1476
/* If the cursor is the only thing on an otherwise-blank last line,
1477
compensate so we don't print an extra CRLF. */
1478
if (_rl_vis_botlin && _rl_last_c_pos == 0 &&
1479
visible_line[vis_lbreaks[_rl_vis_botlin]] == 0)
1484
_rl_move_vert (_rl_vis_botlin);
1485
/* If we've wrapped lines, remove the final xterm line-wrap flag. */
1486
if (full_lines && _rl_term_autowrap && (VIS_LLEN(_rl_vis_botlin) == screenwidth))
1489
last_line = &visible_line[inv_lbreaks[_rl_vis_botlin]];
1490
_rl_move_cursor_relative (screenwidth - 1, last_line);
1491
_rl_clear_to_eol (0);
1492
putc (last_line[screenwidth - 1], rl_outstream);
1496
fflush (rl_outstream);
1500
/* Move to the start of the current line. */
1506
tputs (term_cr, 1, _rl_output_character_function);
1511
/* Redisplay the current line after a SIGWINCH is received. */
1513
_rl_redisplay_after_sigwinch ()
1515
char *t, *oldp, *oldl, *oldlprefix;
1517
/* Clear the current line and put the cursor at column 0. Make sure
1518
the right thing happens if we have wrapped to a new screen line. */
1521
tputs (term_cr, 1, _rl_output_character_function);
1524
tputs (term_clreol, 1, _rl_output_character_function);
1527
space_to_eol (screenwidth);
1528
tputs (term_cr, 1, _rl_output_character_function);
1530
if (_rl_last_v_pos > 0)
1536
/* Redraw only the last line of a multi-line prompt. */
1537
t = strrchr (rl_display_prompt, '\n');
1540
oldp = rl_display_prompt;
1541
oldl = local_prompt;
1542
oldlprefix = local_prompt_prefix;
1543
rl_display_prompt = ++t;
1544
local_prompt = local_prompt_prefix = (char *)NULL;
1545
rl_forced_update_display ();
1546
rl_display_prompt = oldp;
1547
local_prompt = oldl;
1548
local_prompt_prefix = oldlprefix;
1551
rl_forced_update_display ();
1555
_rl_clean_up_for_exit ()
1557
if (readline_echoing_p)
1559
_rl_move_vert (_rl_vis_botlin);
1561
fflush (rl_outstream);
1562
rl_restart_output (1, 0);
1567
_rl_erase_entire_line ()
1570
_rl_clear_to_eol (0);
1572
fflush (rl_outstream);
added
removed
readline-4.0/display.c
