1/* display.c -- readline redisplay facility. */
2
3/* Copyright (C) 1987-2006 Free Software Foundation, Inc.
4
5 This file is part of the GNU Readline Library, a library for
6 reading lines of text with interactive input and history editing.
7
8 The GNU Readline Library is free software; you can redistribute it
9 and/or modify it under the terms of the GNU General Public License
10 as published by the Free Software Foundation; either version 2, or
11 (at your option) any later version.
12
13 The GNU Readline Library is distributed in the hope that it will be
14 useful, but WITHOUT ANY WARRANTY; without even the implied warranty
15 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 The GNU General Public License is often shipped with GNU software, and
19 is generally kept in a file called COPYING or LICENSE. If you do not
20 have a copy of the license, write to the Free Software Foundation,
21 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
22#define READLINE_LIBRARY
23
24#if defined (HAVE_CONFIG_H)
25# include "config_readline.h"
26#endif
27
28#include <sys/types.h>
29
30#if defined (HAVE_UNISTD_H)
31# include <unistd.h>
32#endif /* HAVE_UNISTD_H */
33
34#include "posixstat.h"
35
36#if defined (HAVE_STDLIB_H)
37# include <stdlib.h>
38#else
39# include "ansi_stdlib.h"
40#endif /* HAVE_STDLIB_H */
41
42#include <stdio.h>
43
44/* System-specific feature definitions and include files. */
45#include "rldefs.h"
46#include "rlmbutil.h"
47
48/* Termcap library stuff. */
49#include "tcap.h"
50
51/* Some standard library routines. */
52#include "readline.h"
53#include "history.h"
54
55#include "rlprivate.h"
56#include "xmalloc.h"
57
58#if !defined (strchr) && !defined (__STDC__)
59extern char *strchr (), *strrchr ();
60#endif /* !strchr && !__STDC__ */
61
62static void update_line PARAMS((char *, char *, int, int, int, int));
63static void space_to_eol PARAMS((int));
64static void delete_chars PARAMS((int));
65static void insert_some_chars PARAMS((char *, int, int));
66static void cr PARAMS((void));
67
68#if defined (HANDLE_MULTIBYTE)
69static int _rl_col_width PARAMS((const char *, int, int));
70static int *_rl_wrapped_line;
71#else
72# define _rl_col_width(l, s, e) (((e) <= (s)) ? 0 : (e) - (s))
73#endif
74
75static int *inv_lbreaks, *vis_lbreaks;
76static int inv_lbsize, vis_lbsize;
77
78/* Heuristic used to decide whether it is faster to move from CUR to NEW
79 by backing up or outputting a carriage return and moving forward. CUR
80 and NEW are either both buffer positions or absolute screen positions. */
81#define CR_FASTER(new, cur) (((new) + 1) < ((cur) - (new)))
82
83/* _rl_last_c_pos is an absolute cursor position in multibyte locales and a
84 buffer index in others. This macro is used when deciding whether the
85 current cursor position is in the middle of a prompt string containing
86 invisible characters. */
87#define PROMPT_ENDING_INDEX \
88 ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) ? prompt_physical_chars : prompt_last_invisible+1)
89
90
91/* **************************************************************** */
92/* */
93/* Display stuff */
94/* */
95/* **************************************************************** */
96
97/* This is the stuff that is hard for me. I never seem to write good
98 display routines in C. Let's see how I do this time. */
99
100/* (PWP) Well... Good for a simple line updater, but totally ignores
101 the problems of input lines longer than the screen width.
102
103 update_line and the code that calls it makes a multiple line,
104 automatically wrapping line update. Careful attention needs
105 to be paid to the vertical position variables. */
106
107/* Keep two buffers; one which reflects the current contents of the
108 screen, and the other to draw what we think the new contents should
109 be. Then compare the buffers, and make whatever changes to the
110 screen itself that we should. Finally, make the buffer that we
111 just drew into be the one which reflects the current contents of the
112 screen, and place the cursor where it belongs.
113
114 Commands that want to can fix the display themselves, and then let
115 this function know that the display has been fixed by setting the
116 RL_DISPLAY_FIXED variable. This is good for efficiency. */
117
118/* Application-specific redisplay function. */
119rl_voidfunc_t *rl_redisplay_function = rl_redisplay;
120
121/* Global variables declared here. */
122/* What YOU turn on when you have handled all redisplay yourself. */
123int rl_display_fixed = 0;
124
125int _rl_suppress_redisplay = 0;
126int _rl_want_redisplay = 0;
127
128/* The stuff that gets printed out before the actual text of the line.
129 This is usually pointing to rl_prompt. */
130const char *rl_display_prompt = (const char *)NULL;
131
132/* Pseudo-global variables declared here. */
133
134/* The visible cursor position. If you print some text, adjust this. */
135/* NOTE: _rl_last_c_pos is used as a buffer index when not in a locale
136 supporting multibyte characters, and an absolute cursor position when
137 in such a locale. This is an artifact of the donated multibyte support.
138 Care must be taken when modifying its value. */
139int _rl_last_c_pos = 0;
140int _rl_last_v_pos = 0;
141
142static int cpos_adjusted;
143static int cpos_buffer_position;
144
145/* Number of lines currently on screen minus 1. */
146int _rl_vis_botlin = 0;
147
148/* Variables used only in this file. */
149/* The last left edge of text that was displayed. This is used when
150 doing horizontal scrolling. It shifts in thirds of a screenwidth. */
151static int last_lmargin;
152
153/* The line display buffers. One is the line currently displayed on
154 the screen. The other is the line about to be displayed. */
155static char *visible_line = (char *)NULL;
156static char *invisible_line = (char *)NULL;
157
158/* A buffer for `modeline' messages. */
159static char msg_buf[128];
160
161/* Non-zero forces the redisplay even if we thought it was unnecessary. */
162static int forced_display;
163
164/* Default and initial buffer size. Can grow. */
165static int line_size = 1024;
166
167/* Variables to keep track of the expanded prompt string, which may
168 include invisible characters. */
169
170static char *local_prompt, *local_prompt_prefix;
171static int local_prompt_len;
172static int prompt_visible_length, prompt_prefix_length;
173
174/* The number of invisible characters in the line currently being
175 displayed on the screen. */
176static int visible_wrap_offset;
177
178/* The number of invisible characters in the prompt string. Static so it
179 can be shared between rl_redisplay and update_line */
180static int wrap_offset;
181
182/* The index of the last invisible character in the prompt string. */
183static int prompt_last_invisible;
184
185/* The length (buffer offset) of the first line of the last (possibly
186 multi-line) buffer displayed on the screen. */
187static int visible_first_line_len;
188
189/* Number of invisible characters on the first physical line of the prompt.
190 Only valid when the number of physical characters in the prompt exceeds
191 (or is equal to) _rl_screenwidth. */
192static int prompt_invis_chars_first_line;
193
194static int prompt_physical_chars;
195
196/* Variables to save and restore prompt and display information. */
197
198/* These are getting numerous enough that it's time to create a struct. */
199
200static char *saved_local_prompt;
201static char *saved_local_prefix;
202static int saved_last_invisible;
203static int saved_visible_length;
204static int saved_prefix_length;
205static int saved_local_length;
206static int saved_invis_chars_first_line;
207static int saved_physical_chars;
208
209/* Expand the prompt string S and return the number of visible
210 characters in *LP, if LP is not null. This is currently more-or-less
211 a placeholder for expansion. LIP, if non-null is a place to store the
212 index of the last invisible character in the returned string. NIFLP,
213 if non-zero, is a place to store the number of invisible characters in
214 the first prompt line. The previous are used as byte counts -- indexes
215 into a character buffer. */
216
217/* Current implementation:
218 \001 (^A) start non-visible characters
219 \002 (^B) end non-visible characters
220 all characters except \001 and \002 (following a \001) are copied to
221 the returned string; all characters except those between \001 and
222 \002 are assumed to be `visible'. */
223
224static char *
225expand_prompt (pmt, lp, lip, niflp, vlp)
226 char *pmt;
227 int *lp, *lip, *niflp, *vlp;
228{
229 char *r, *ret, *p, *igstart;
230 int l, rl, last, ignoring, ninvis, invfl, invflset, physchars;
231#if defined (HANDLE_MULTIBYTE)
232 int ind, pind;
233#endif
234
235 /* Short-circuit if we can. */
236 if ((MB_CUR_MAX <= 1 || rl_byte_oriented) && strchr (pmt, RL_PROMPT_START_IGNORE) == 0)
237 {
238 r = savestring (pmt);
239 if (lp)
240 *lp = strlen (r);
241 if (lip)
242 *lip = 0;
243 if (niflp)
244 *niflp = 0;
245 if (vlp)
246 *vlp = lp ? *lp : (int)strlen (r);
247 return r;
248 }
249
250 l = strlen (pmt);
251 r = ret = (char *)xmalloc (l + 1);
252
253 invfl = 0; /* invisible chars in first line of prompt */
254 invflset = 0; /* we only want to set invfl once */
255
256 igstart = 0;
257 for (rl = ignoring = last = ninvis = physchars = 0, p = pmt; p && *p; p++)
258 {
259 /* This code strips the invisible character string markers
260 RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */
261 if (ignoring == 0 && *p == RL_PROMPT_START_IGNORE) /* XXX - check ignoring? */
262 {
263 ignoring = 1;
264 igstart = p;
265 continue;
266 }
267 else if (ignoring && *p == RL_PROMPT_END_IGNORE)
268 {
269 ignoring = 0;
270 if (p != (igstart + 1))
271 last = r - ret - 1;
272 continue;
273 }
274 else
275 {
276#if defined (HANDLE_MULTIBYTE)
277 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
278 {
279 pind = p - pmt;
280 ind = _rl_find_next_mbchar (pmt, pind, 1, MB_FIND_NONZERO);
281 l = ind - pind;
282 while (l--)
283 *r++ = *p++;
284 if (!ignoring)
285 {
286 rl += ind - pind;
287 physchars += _rl_col_width (pmt, pind, ind);
288 }
289 else
290 ninvis += ind - pind;
291 p--; /* compensate for later increment */
292 }
293 else
294#endif
295 {
296 *r++ = *p;
297 if (!ignoring)
298 {
299 rl++; /* visible length byte counter */
300 physchars++;
301 }
302 else
303 ninvis++; /* invisible chars byte counter */
304 }
305
306 if (invflset == 0 && rl >= _rl_screenwidth)
307 {
308 invfl = ninvis;
309 invflset = 1;
310 }
311 }
312 }
313
314 if (rl < _rl_screenwidth)
315 invfl = ninvis;
316
317 *r = '\0';
318 if (lp)
319 *lp = rl;
320 if (lip)
321 *lip = last;
322 if (niflp)
323 *niflp = invfl;
324 if (vlp)
325 *vlp = physchars;
326 return ret;
327}
328
329/* Just strip out RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE from
330 PMT and return the rest of PMT. */
331char *
332_rl_strip_prompt (pmt)
333 char *pmt;
334{
335 char *ret;
336
337 ret = expand_prompt (pmt, (int *)NULL, (int *)NULL, (int *)NULL, (int *)NULL);
338 return ret;
339}
340
341/*
342 * Expand the prompt string into the various display components, if
343 * necessary.
344 *
345 * local_prompt = expanded last line of string in rl_display_prompt
346 * (portion after the final newline)
347 * local_prompt_prefix = portion before last newline of rl_display_prompt,
348 * expanded via expand_prompt
349 * prompt_visible_length = number of visible characters in local_prompt
350 * prompt_prefix_length = number of visible characters in local_prompt_prefix
351 *
352 * This function is called once per call to readline(). It may also be
353 * called arbitrarily to expand the primary prompt.
354 *
355 * The return value is the number of visible characters on the last line
356 * of the (possibly multi-line) prompt.
357 */
358int
359rl_expand_prompt (prompt)
360 char *prompt;
361{
362 char *p, *t;
363 int c;
364
365 /* Clear out any saved values. */
366 FREE (local_prompt);
367 FREE (local_prompt_prefix);
368
369 local_prompt = local_prompt_prefix = (char *)0;
370 local_prompt_len = 0;
371 prompt_last_invisible = prompt_invis_chars_first_line = 0;
372 prompt_visible_length = prompt_physical_chars = 0;
373
374 if (prompt == 0 || *prompt == 0)
375 return (0);
376
377 p = strrchr (prompt, '\n');
378 if (!p)
379 {
380 /* The prompt is only one logical line, though it might wrap. */
381 local_prompt = expand_prompt (prompt, &prompt_visible_length,
382 &prompt_last_invisible,
383 &prompt_invis_chars_first_line,
384 &prompt_physical_chars);
385 local_prompt_prefix = (char *)0;
386 local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
387 return (prompt_visible_length);
388 }
389 else
390 {
391 /* The prompt spans multiple lines. */
392 t = ++p;
393 local_prompt = expand_prompt (p, &prompt_visible_length,
394 &prompt_last_invisible,
395 (int *)NULL,
396 &prompt_physical_chars);
397 c = *t; *t = '\0';
398 /* The portion of the prompt string up to and including the
399 final newline is now null-terminated. */
400 local_prompt_prefix = expand_prompt (prompt, &prompt_prefix_length,
401 (int *)NULL,
402 &prompt_invis_chars_first_line,
403 (int *)NULL);
404 *t = c;
405 local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
406 return (prompt_prefix_length);
407 }
408}
409
410/* Initialize the VISIBLE_LINE and INVISIBLE_LINE arrays, and their associated
411 arrays of line break markers. MINSIZE is the minimum size of VISIBLE_LINE
412 and INVISIBLE_LINE; if it is greater than LINE_SIZE, LINE_SIZE is
413 increased. If the lines have already been allocated, this ensures that
414 they can hold at least MINSIZE characters. */
415static void
416init_line_structures (minsize)
417 int minsize;
418{
419 register int n;
420
421 if (invisible_line == 0) /* initialize it */
422 {
423 if (line_size < minsize)
424 line_size = minsize;
425 visible_line = (char *)xmalloc (line_size);
426 invisible_line = (char *)xmalloc (line_size);
427 }
428 else if (line_size < minsize) /* ensure it can hold MINSIZE chars */
429 {
430 line_size *= 2;
431 if (line_size < minsize)
432 line_size = minsize;
433 visible_line = (char *)xrealloc (visible_line, line_size);
434 invisible_line = (char *)xrealloc (invisible_line, line_size);
435 }
436
437 for (n = minsize; n < line_size; n++)
438 {
439 visible_line[n] = 0;
440 invisible_line[n] = 1;
441 }
442
443 if (vis_lbreaks == 0)
444 {
445 /* should be enough. */
446 inv_lbsize = vis_lbsize = 256;
447 inv_lbreaks = (int *)xmalloc (inv_lbsize * sizeof (int));
448 vis_lbreaks = (int *)xmalloc (vis_lbsize * sizeof (int));
449#if defined (HANDLE_MULTIBYTE)
450 _rl_wrapped_line = (int *)xmalloc (vis_lbsize * sizeof (int));
451#endif
452 inv_lbreaks[0] = vis_lbreaks[0] = 0;
453 }
454}
455
456/* Basic redisplay algorithm. */
457void
458rl_redisplay ()
459{
460 register int in, out, c, linenum, cursor_linenum;
461 register char *line;
462 int inv_botlin, lb_linenum, o_cpos;
463 int newlines, lpos, temp, modmark;
464 const char *prompt_this_line;
465#if defined (HANDLE_MULTIBYTE)
466 int num, n0= 0;
467 wchar_t wc;
468 size_t wc_bytes;
469 int wc_width= 0;
470 mbstate_t ps;
471 int _rl_wrapped_multicolumn = 0;
472#endif
473
474 if (!readline_echoing_p)
475 return;
476
477 if (!rl_display_prompt)
478 rl_display_prompt = "";
479
480 if (invisible_line == 0 || vis_lbreaks == 0)
481 {
482 init_line_structures (0);
483 rl_on_new_line ();
484 }
485
486 /* Draw the line into the buffer. */
487 cpos_buffer_position = -1;
488
489 line = invisible_line;
490 out = inv_botlin = 0;
491
492 /* Mark the line as modified or not. We only do this for history
493 lines. */
494 modmark = 0;
495 if (_rl_mark_modified_lines && current_history () && rl_undo_list)
496 {
497 line[out++] = '*';
498 line[out] = '\0';
499 modmark = 1;
500 }
501
502 /* If someone thought that the redisplay was handled, but the currently
503 visible line has a different modification state than the one about
504 to become visible, then correct the caller's misconception. */
505 if (visible_line[0] != invisible_line[0])
506 rl_display_fixed = 0;
507
508 /* If the prompt to be displayed is the `primary' readline prompt (the
509 one passed to readline()), use the values we have already expanded.
510 If not, use what's already in rl_display_prompt. WRAP_OFFSET is the
511 number of non-visible characters in the prompt string. */
512 if (rl_display_prompt == rl_prompt || local_prompt)
513 {
514 if (local_prompt_prefix && forced_display)
515 _rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix));
516
517 if (local_prompt_len > 0)
518 {
519 temp = local_prompt_len + out + 2;
520 if (temp >= line_size)
521 {
522 line_size = (temp + 1024) - (temp % 1024);
523 visible_line = (char *)xrealloc (visible_line, line_size);
524 line = invisible_line = (char *)xrealloc (invisible_line, line_size);
525 }
526 strncpy (line + out, local_prompt, local_prompt_len);
527 out += local_prompt_len;
528 }
529 line[out] = '\0';
530 wrap_offset = local_prompt_len - prompt_visible_length;
531 }
532 else
533 {
534 int pmtlen;
535 prompt_this_line = strrchr (rl_display_prompt, '\n');
536 if (!prompt_this_line)
537 prompt_this_line = rl_display_prompt;
538 else
539 {
540 prompt_this_line++;
541 pmtlen = prompt_this_line - rl_display_prompt; /* temp var */
542 if (forced_display)
543 {
544 _rl_output_some_chars (rl_display_prompt, pmtlen);
545 /* Make sure we are at column zero even after a newline,
546 regardless of the state of terminal output processing. */
547 if (pmtlen < 2 || prompt_this_line[-2] != '\r')
548 cr ();
549 }
550 }
551
552 prompt_physical_chars = pmtlen = strlen (prompt_this_line);
553 temp = pmtlen + out + 2;
554 if (temp >= line_size)
555 {
556 line_size = (temp + 1024) - (temp % 1024);
557 visible_line = (char *)xrealloc (visible_line, line_size);
558 line = invisible_line = (char *)xrealloc (invisible_line, line_size);
559 }
560 strncpy (line + out, prompt_this_line, pmtlen);
561 out += pmtlen;
562 line[out] = '\0';
563 wrap_offset = prompt_invis_chars_first_line = 0;
564 }
565
566#define CHECK_INV_LBREAKS() \
567 do { \
568 if (newlines >= (inv_lbsize - 2)) \
569 { \
570 inv_lbsize *= 2; \
571 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
572 } \
573 } while (0)
574
575#if defined (HANDLE_MULTIBYTE)
576#define CHECK_LPOS() \
577 do { \
578 lpos++; \
579 if (lpos >= _rl_screenwidth) \
580 { \
581 if (newlines >= (inv_lbsize - 2)) \
582 { \
583 inv_lbsize *= 2; \
584 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
585 _rl_wrapped_line = (int *)xrealloc (_rl_wrapped_line, inv_lbsize * sizeof (int)); \
586 } \
587 inv_lbreaks[++newlines] = out; \
588 _rl_wrapped_line[newlines] = _rl_wrapped_multicolumn; \
589 lpos = 0; \
590 } \
591 } while (0)
592#else
593#define CHECK_LPOS() \
594 do { \
595 lpos++; \
596 if (lpos >= _rl_screenwidth) \
597 { \
598 if (newlines >= (inv_lbsize - 2)) \
599 { \
600 inv_lbsize *= 2; \
601 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
602 } \
603 inv_lbreaks[++newlines] = out; \
604 lpos = 0; \
605 } \
606 } while (0)
607#endif
608
609 /* inv_lbreaks[i] is where line i starts in the buffer. */
610 inv_lbreaks[newlines = 0] = 0;
611#if 0
612 lpos = out - wrap_offset;
613#else
614 lpos = prompt_physical_chars + modmark;
615#endif
616
617#if defined (HANDLE_MULTIBYTE)
618 memset (_rl_wrapped_line, 0, vis_lbsize);
619 num = 0;
620#endif
621
622 /* prompt_invis_chars_first_line is the number of invisible characters in
623 the first physical line of the prompt.
624 wrap_offset - prompt_invis_chars_first_line is the number of invis
625 chars on the second line. */
626
627 /* what if lpos is already >= _rl_screenwidth before we start drawing the
628 contents of the command line? */
629 while (lpos >= _rl_screenwidth)
630 {
631 /* fix from Darin Johnson <darin@acuson.com> for prompt string with
632 invisible characters that is longer than the screen width. The
633 prompt_invis_chars_first_line variable could be made into an array
634 saying how many invisible characters there are per line, but that's
635 probably too much work for the benefit gained. How many people have
636 prompts that exceed two physical lines?
637 Additional logic fix from Edward Catmur <ed@catmur.co.uk> */
638#if defined (HANDLE_MULTIBYTE)
639 int z;
640 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
641 {
642 n0 = num;
643 temp = local_prompt_len;
644 while (num < temp)
645 {
646 z = _rl_col_width (local_prompt, n0, num);
647 if (z > _rl_screenwidth)
648 {
649 num = _rl_find_prev_mbchar (local_prompt, num, MB_FIND_ANY);
650 break;
651 }
652 else if (z == _rl_screenwidth)
653 break;
654 num++;
655 }
656 temp = num;
657 }
658 else
659#endif /* !HANDLE_MULTIBYTE */
660 temp = ((newlines + 1) * _rl_screenwidth);
661
662 /* Now account for invisible characters in the current line. */
663 temp += ((local_prompt_prefix == 0) ? ((newlines == 0) ? prompt_invis_chars_first_line
664 : ((newlines == 1) ? wrap_offset : 0))
665 : ((newlines == 0) ? wrap_offset :0));
666
667 inv_lbreaks[++newlines] = temp;
668#if defined (HANDLE_MULTIBYTE)
669 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
670 lpos -= _rl_col_width (local_prompt, n0, num);
671 else
672#endif
673 lpos -= _rl_screenwidth;
674 }
675
676 /* Draw the rest of the line (after the prompt) into invisible_line, keeping
677 track of where the cursor is (cpos_buffer_position), the number of the line containing
678 the cursor (lb_linenum), the last line number (inv_botlin).
679 It maintains an array of line breaks for display (inv_lbreaks).
680 This handles expanding tabs for display and displaying meta characters. */
681 lb_linenum = 0;
682#if defined (HANDLE_MULTIBYTE)
683 in = 0;
684 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
685 {
686 memset (&ps, 0, sizeof (mbstate_t));
687 wc_bytes = mbrtowc (&wc, rl_line_buffer, rl_end, &ps);
688 }
689 else
690 wc_bytes = 1;
691 while (in < rl_end)
692#else
693 for (in = 0; in < rl_end; in++)
694#endif
695 {
696 c = (unsigned char)rl_line_buffer[in];
697
698#if defined (HANDLE_MULTIBYTE)
699 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
700 {
701 if (MB_INVALIDCH (wc_bytes))
702 {
703 /* Byte sequence is invalid or shortened. Assume that the
704 first byte represents a character. */
705 wc_bytes = 1;
706 /* Assume that a character occupies a single column. */
707 wc_width = 1;
708 memset (&ps, 0, sizeof (mbstate_t));
709 }
710 else if (MB_NULLWCH (wc_bytes))
711 break; /* Found '\0' */
712 else
713 {
714 temp = wcwidth (wc);
715 wc_width = (temp >= 0) ? temp : 1;
716 }
717 }
718#endif
719
720 if (out + 8 >= line_size) /* XXX - 8 for \t */
721 {
722 line_size *= 2;
723 visible_line = (char *)xrealloc (visible_line, line_size);
724 invisible_line = (char *)xrealloc (invisible_line, line_size);
725 line = invisible_line;
726 }
727
728 if (in == rl_point)
729 {
730 cpos_buffer_position = out;
731 lb_linenum = newlines;
732 }
733
734#if defined (HANDLE_MULTIBYTE)
735 if (META_CHAR (c) && _rl_output_meta_chars == 0) /* XXX - clean up */
736#else
737 if (META_CHAR (c))
738#endif
739 {
740 if (_rl_output_meta_chars == 0)
741 {
742 sprintf (line + out, "\\%o", c);
743
744 if (lpos + 4 >= _rl_screenwidth)
745 {
746 temp = _rl_screenwidth - lpos;
747 CHECK_INV_LBREAKS ();
748 inv_lbreaks[++newlines] = out + temp;
749 lpos = 4 - temp;
750 }
751 else
752 lpos += 4;
753
754 out += 4;
755 }
756 else
757 {
758 line[out++] = c;
759 CHECK_LPOS();
760 }
761 }
762#if defined (DISPLAY_TABS)
763 else if (c == '\t')
764 {
765 register int newout;
766
767#if 0
768 newout = (out | (int)7) + 1;
769#else
770 newout = out + 8 - lpos % 8;
771#endif
772 temp = newout - out;
773 if (lpos + temp >= _rl_screenwidth)
774 {
775 register int temp2;
776 temp2 = _rl_screenwidth - lpos;
777 CHECK_INV_LBREAKS ();
778 inv_lbreaks[++newlines] = out + temp2;
779 lpos = temp - temp2;
780 while (out < newout)
781 line[out++] = ' ';
782 }
783 else
784 {
785 while (out < newout)
786 line[out++] = ' ';
787 lpos += temp;
788 }
789 }
790#endif
791 else if (c == '\n' && _rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up)
792 {
793 line[out++] = '\0'; /* XXX - sentinel */
794 CHECK_INV_LBREAKS ();
795 inv_lbreaks[++newlines] = out;
796 lpos = 0;
797 }
798 else if (CTRL_CHAR (c) || c == RUBOUT)
799 {
800 line[out++] = '^';
801 CHECK_LPOS();
802 line[out++] = CTRL_CHAR (c) ? UNCTRL (c) : '?';
803 CHECK_LPOS();
804 }
805 else
806 {
807#if defined (HANDLE_MULTIBYTE)
808 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
809 {
810 register int i;
811
812 _rl_wrapped_multicolumn = 0;
813
814 if (_rl_screenwidth < lpos + wc_width)
815 for (i = lpos; i < _rl_screenwidth; i++)
816 {
817 /* The space will be removed in update_line() */
818 line[out++] = ' ';
819 _rl_wrapped_multicolumn++;
820 CHECK_LPOS();
821 }
822 if (in == rl_point)
823 {
824 cpos_buffer_position = out;
825 lb_linenum = newlines;
826 }
827 for (i = in; i < in+(int)wc_bytes; i++)
828 line[out++] = rl_line_buffer[i];
829 for (i = 0; i < wc_width; i++)
830 CHECK_LPOS();
831 }
832 else
833 {
834 line[out++] = c;
835 CHECK_LPOS();
836 }
837#else
838 line[out++] = c;
839 CHECK_LPOS();
840#endif
841 }
842
843#if defined (HANDLE_MULTIBYTE)
844 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
845 {
846 in += wc_bytes;
847 wc_bytes = mbrtowc (&wc, rl_line_buffer + in, rl_end - in, &ps);
848 }
849 else
850 in++;
851#endif
852
853 }
854 line[out] = '\0';
855 if (cpos_buffer_position < 0)
856 {
857 cpos_buffer_position = out;
858 lb_linenum = newlines;
859 }
860
861 inv_botlin = newlines;
862 CHECK_INV_LBREAKS ();
863 inv_lbreaks[newlines+1] = out;
864 cursor_linenum = lb_linenum;
865
866 /* CPOS_BUFFER_POSITION == position in buffer where cursor should be placed.
867 CURSOR_LINENUM == line number where the cursor should be placed. */
868
869 /* PWP: now is when things get a bit hairy. The visible and invisible
870 line buffers are really multiple lines, which would wrap every
871 (screenwidth - 1) characters. Go through each in turn, finding
872 the changed region and updating it. The line order is top to bottom. */
873
874 /* If we can move the cursor up and down, then use multiple lines,
875 otherwise, let long lines display in a single terminal line, and
876 horizontally scroll it. */
877
878 if (_rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up)
879 {
880 int nleft, pos, changed_screen_line, tx;
881 char empty_str[1] = { 0 };
882
883 if (!rl_display_fixed || forced_display)
884 {
885 forced_display = 0;
886
887 /* If we have more than a screenful of material to display, then
888 only display a screenful. We should display the last screen,
889 not the first. */
890 if (out >= _rl_screenchars)
891 {
892 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
893 out = _rl_find_prev_mbchar (line, _rl_screenchars, MB_FIND_ANY);
894 else
895 out = _rl_screenchars - 1;
896 }
897
898 /* The first line is at character position 0 in the buffer. The
899 second and subsequent lines start at inv_lbreaks[N], offset by
900 OFFSET (which has already been calculated above). */
901
902#define W_OFFSET(line, offset) ((line) == 0 ? offset : 0)
903#define VIS_LLEN(l) ((l) > _rl_vis_botlin ? 0 : (vis_lbreaks[l+1] - vis_lbreaks[l]))
904#define INV_LLEN(l) (inv_lbreaks[l+1] - inv_lbreaks[l])
905#define VIS_CHARS(line) (visible_line + vis_lbreaks[line])
906#define VIS_LINE(line) ((line) > _rl_vis_botlin) ? empty_str : VIS_CHARS(line)
907#define INV_LINE(line) (invisible_line + inv_lbreaks[line])
908
909 /* For each line in the buffer, do the updating display. */
910 for (linenum = 0; linenum <= inv_botlin; linenum++)
911 {
912 /* This can lead us astray if we execute a program that changes
913 the locale from a non-multibyte to a multibyte one. */
914 o_cpos = _rl_last_c_pos;
915 cpos_adjusted = 0;
916 update_line (VIS_LINE(linenum), INV_LINE(linenum), linenum,
917 VIS_LLEN(linenum), INV_LLEN(linenum), inv_botlin);
918
919 /* update_line potentially changes _rl_last_c_pos, but doesn't
920 take invisible characters into account, since _rl_last_c_pos
921 is an absolute cursor position in a multibyte locale. See
922 if compensating here is the right thing, or if we have to
923 change update_line itself. There is one case in which
924 update_line adjusts _rl_last_c_pos itself (so it can pass
925 _rl_move_cursor_relative accurate values); it communicates
926 this back by setting cpos_adjusted. If we assume that
927 _rl_last_c_pos is correct (an absolute cursor position) each
928 time update_line is called, then we can assume in our
929 calculations that o_cpos does not need to be adjusted by
930 wrap_offset. */
931 if (linenum == 0 && (MB_CUR_MAX > 1 && rl_byte_oriented == 0) &&
932 cpos_adjusted == 0 &&
933 _rl_last_c_pos != o_cpos &&
934 _rl_last_c_pos > wrap_offset &&
935 o_cpos < prompt_last_invisible)
936 _rl_last_c_pos -= wrap_offset;
937
938 /* If this is the line with the prompt, we might need to
939 compensate for invisible characters in the new line. Do
940 this only if there is not more than one new line (which
941 implies that we completely overwrite the old visible line)
942 and the new line is shorter than the old. Make sure we are
943 at the end of the new line before clearing. */
944 if (linenum == 0 &&
945 inv_botlin == 0 && _rl_last_c_pos == out &&
946 (wrap_offset > visible_wrap_offset) &&
947 (_rl_last_c_pos < visible_first_line_len))
948 {
949 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
950 nleft = _rl_screenwidth - _rl_last_c_pos;
951 else
952 nleft = _rl_screenwidth + wrap_offset - _rl_last_c_pos;
953 if (nleft)
954 _rl_clear_to_eol (nleft);
955 }
956
957 /* Since the new first line is now visible, save its length. */
958 if (linenum == 0)
959 visible_first_line_len = (inv_botlin > 0) ? inv_lbreaks[1] : out - wrap_offset;
960 }
961
962 /* We may have deleted some lines. If so, clear the left over
963 blank ones at the bottom out. */
964 if (_rl_vis_botlin > inv_botlin)
965 {
966 char *tt;
967 for (; linenum <= _rl_vis_botlin; linenum++)
968 {
969 tt = VIS_CHARS (linenum);
970 _rl_move_vert (linenum);
971 _rl_move_cursor_relative (0, tt);
972 _rl_clear_to_eol
973 ((linenum == _rl_vis_botlin) ? (int)strlen (tt) : _rl_screenwidth);
974 }
975 }
976 _rl_vis_botlin = inv_botlin;
977
978 /* CHANGED_SCREEN_LINE is set to 1 if we have moved to a
979 different screen line during this redisplay. */
980 changed_screen_line = _rl_last_v_pos != cursor_linenum;
981 if (changed_screen_line)
982 {
983 _rl_move_vert (cursor_linenum);
984 /* If we moved up to the line with the prompt using _rl_term_up,
985 the physical cursor position on the screen stays the same,
986 but the buffer position needs to be adjusted to account
987 for invisible characters. */
988 if ((MB_CUR_MAX == 1 || rl_byte_oriented) && cursor_linenum == 0 && wrap_offset)
989 _rl_last_c_pos += wrap_offset;
990 }
991
992 /* We have to reprint the prompt if it contains invisible
993 characters, since it's not generally OK to just reprint
994 the characters from the current cursor position. But we
995 only need to reprint it if the cursor is before the last
996 invisible character in the prompt string. */
997 nleft = prompt_visible_length + wrap_offset;
998 if (cursor_linenum == 0 && wrap_offset > 0 && _rl_last_c_pos > 0 &&
999#if 0
1000 _rl_last_c_pos <= PROMPT_ENDING_INDEX && local_prompt)
1001#else
1002 _rl_last_c_pos < PROMPT_ENDING_INDEX && local_prompt)
1003#endif
1004 {
1005#if defined (__MSDOS__)
1006 putc ('\r', rl_outstream);
1007#else
1008 if (_rl_term_cr)
1009 tputs (_rl_term_cr, 1, _rl_output_character_function);
1010#endif
1011 _rl_output_some_chars (local_prompt, nleft);
1012 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1013 _rl_last_c_pos = _rl_col_width (local_prompt, 0, nleft) - wrap_offset;
1014 else
1015 _rl_last_c_pos = nleft;
1016 }
1017
1018 /* Where on that line? And where does that line start
1019 in the buffer? */
1020 pos = inv_lbreaks[cursor_linenum];
1021 /* nleft == number of characters in the line buffer between the
1022 start of the line and the desired cursor position. */
1023 nleft = cpos_buffer_position - pos;
1024
1025 /* NLEFT is now a number of characters in a buffer. When in a
1026 multibyte locale, however, _rl_last_c_pos is an absolute cursor
1027 position that doesn't take invisible characters in the prompt
1028 into account. We use a fudge factor to compensate. */
1029
1030 /* Since _rl_backspace() doesn't know about invisible characters in the
1031 prompt, and there's no good way to tell it, we compensate for
1032 those characters here and call _rl_backspace() directly. */
1033 if (wrap_offset && cursor_linenum == 0 && nleft < _rl_last_c_pos)
1034 {
1035 /* TX == new physical cursor position in multibyte locale. */
1036 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1037 tx = _rl_col_width (&visible_line[pos], 0, nleft) - visible_wrap_offset;
1038 else
1039 tx = nleft;
1040 if (_rl_last_c_pos > tx)
1041 {
1042 _rl_backspace (_rl_last_c_pos - tx); /* XXX */
1043 _rl_last_c_pos = tx;
1044 }
1045 }
1046
1047 /* We need to note that in a multibyte locale we are dealing with
1048 _rl_last_c_pos as an absolute cursor position, but moving to a
1049 point specified by a buffer position (NLEFT) that doesn't take
1050 invisible characters into account. */
1051 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1052 _rl_move_cursor_relative (nleft, &invisible_line[pos]);
1053 else if (nleft != _rl_last_c_pos)
1054 _rl_move_cursor_relative (nleft, &invisible_line[pos]);
1055 }
1056 }
1057 else /* Do horizontal scrolling. */
1058 {
1059#define M_OFFSET(margin, offset) ((margin) == 0 ? offset : 0)
1060 int lmargin, ndisp, nleft, phys_c_pos, t;
1061
1062 /* Always at top line. */
1063 _rl_last_v_pos = 0;
1064
1065 /* Compute where in the buffer the displayed line should start. This
1066 will be LMARGIN. */
1067
1068 /* The number of characters that will be displayed before the cursor. */
1069 ndisp = cpos_buffer_position - wrap_offset;
1070 nleft = prompt_visible_length + wrap_offset;
1071 /* Where the new cursor position will be on the screen. This can be
1072 longer than SCREENWIDTH; if it is, lmargin will be adjusted. */
1073 phys_c_pos = cpos_buffer_position - (last_lmargin ? last_lmargin : wrap_offset);
1074 t = _rl_screenwidth / 3;
1075
1076 /* If the number of characters had already exceeded the screenwidth,
1077 last_lmargin will be > 0. */
1078
1079 /* If the number of characters to be displayed is more than the screen
1080 width, compute the starting offset so that the cursor is about
1081 two-thirds of the way across the screen. */
1082 if (phys_c_pos > _rl_screenwidth - 2)
1083 {
1084 lmargin = cpos_buffer_position - (2 * t);
1085 if (lmargin < 0)
1086 lmargin = 0;
1087 /* If the left margin would be in the middle of a prompt with
1088 invisible characters, don't display the prompt at all. */
1089 if (wrap_offset && lmargin > 0 && lmargin < nleft)
1090 lmargin = nleft;
1091 }
1092 else if (ndisp < _rl_screenwidth - 2) /* XXX - was -1 */
1093 lmargin = 0;
1094 else if (phys_c_pos < 1)
1095 {
1096 /* If we are moving back towards the beginning of the line and
1097 the last margin is no longer correct, compute a new one. */
1098 lmargin = ((cpos_buffer_position - 1) / t) * t; /* XXX */
1099 if (wrap_offset && lmargin > 0 && lmargin < nleft)
1100 lmargin = nleft;
1101 }
1102 else
1103 lmargin = last_lmargin;
1104
1105 /* If the first character on the screen isn't the first character
1106 in the display line, indicate this with a special character. */
1107 if (lmargin > 0)
1108 line[lmargin] = '<';
1109
1110 /* If SCREENWIDTH characters starting at LMARGIN do not encompass
1111 the whole line, indicate that with a special character at the
1112 right edge of the screen. If LMARGIN is 0, we need to take the
1113 wrap offset into account. */
1114 t = lmargin + M_OFFSET (lmargin, wrap_offset) + _rl_screenwidth;
1115 if (t < out)
1116 line[t - 1] = '>';
1117
1118 if (!rl_display_fixed || forced_display || lmargin != last_lmargin)
1119 {
1120 forced_display = 0;
1121 update_line (&visible_line[last_lmargin],
1122 &invisible_line[lmargin],
1123 0,
1124 _rl_screenwidth + visible_wrap_offset,
1125 _rl_screenwidth + (lmargin ? 0 : wrap_offset),
1126 0);
1127
1128 /* If the visible new line is shorter than the old, but the number
1129 of invisible characters is greater, and we are at the end of
1130 the new line, we need to clear to eol. */
1131 t = _rl_last_c_pos - M_OFFSET (lmargin, wrap_offset);
1132 if ((M_OFFSET (lmargin, wrap_offset) > visible_wrap_offset) &&
1133 (_rl_last_c_pos == out) &&
1134 t < visible_first_line_len)
1135 {
1136 nleft = _rl_screenwidth - t;
1137 _rl_clear_to_eol (nleft);
1138 }
1139 visible_first_line_len = out - lmargin - M_OFFSET (lmargin, wrap_offset);
1140 if (visible_first_line_len > _rl_screenwidth)
1141 visible_first_line_len = _rl_screenwidth;
1142
1143 _rl_move_cursor_relative (cpos_buffer_position - lmargin, &invisible_line[lmargin]);
1144 last_lmargin = lmargin;
1145 }
1146 }
1147 fflush (rl_outstream);
1148
1149 /* Swap visible and non-visible lines. */
1150 {
1151 char *vtemp = visible_line;
1152 int *itemp = vis_lbreaks, ntemp = vis_lbsize;
1153
1154 visible_line = invisible_line;
1155 invisible_line = vtemp;
1156
1157 vis_lbreaks = inv_lbreaks;
1158 inv_lbreaks = itemp;
1159
1160 vis_lbsize = inv_lbsize;
1161 inv_lbsize = ntemp;
1162
1163 rl_display_fixed = 0;
1164 /* If we are displaying on a single line, and last_lmargin is > 0, we
1165 are not displaying any invisible characters, so set visible_wrap_offset
1166 to 0. */
1167 if (_rl_horizontal_scroll_mode && last_lmargin)
1168 visible_wrap_offset = 0;
1169 else
1170 visible_wrap_offset = wrap_offset;
1171 }
1172}
1173
1174/* PWP: update_line() is based on finding the middle difference of each
1175 line on the screen; vis:
1176
1177 /old first difference
1178 /beginning of line | /old last same /old EOL
1179 v v v v
1180old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as
1181new: eddie> Oh, my little buggy says to me, as lurgid as
1182 ^ ^ ^ ^
1183 \beginning of line | \new last same \new end of line
1184 \new first difference
1185
1186 All are character pointers for the sake of speed. Special cases for
1187 no differences, as well as for end of line additions must be handled.
1188
1189 Could be made even smarter, but this works well enough */
1190static void
1191update_line (old, new, current_line, omax, nmax, inv_botlin)
1192 register char *old, *new;
1193 int current_line, omax, nmax, inv_botlin;
1194{
1195 register char *ofd, *ols, *oe, *nfd, *nls, *ne;
1196 int temp, lendiff, wsatend, od, nd;
1197 int current_invis_chars;
1198 int col_lendiff, col_temp;
1199#if defined (HANDLE_MULTIBYTE)
1200 mbstate_t ps_new, ps_old;
1201 int new_offset, old_offset;
1202#endif
1203
1204 /* If we're at the right edge of a terminal that supports xn, we're
1205 ready to wrap around, so do so. This fixes problems with knowing
1206 the exact cursor position and cut-and-paste with certain terminal
1207 emulators. In this calculation, TEMP is the physical screen
1208 position of the cursor. */
1209 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1210 temp = _rl_last_c_pos;
1211 else
1212 temp = _rl_last_c_pos - W_OFFSET(_rl_last_v_pos, visible_wrap_offset);
1213 if (temp == _rl_screenwidth && _rl_term_autowrap && !_rl_horizontal_scroll_mode
1214 && _rl_last_v_pos == current_line - 1)
1215 {
1216#if defined (HANDLE_MULTIBYTE)
1217 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1218 {
1219 wchar_t wc;
1220 mbstate_t ps;
1221 int tempwidth, bytes;
1222 size_t ret;
1223
1224 /* This fixes only double-column characters, but if the wrapped
1225 character comsumes more than three columns, spaces will be
1226 inserted in the string buffer. */
1227 if (_rl_wrapped_line[current_line] > 0)
1228 _rl_clear_to_eol (_rl_wrapped_line[current_line]);
1229
1230 memset (&ps, 0, sizeof (mbstate_t));
1231 ret = mbrtowc (&wc, new, MB_CUR_MAX, &ps);
1232 if (MB_INVALIDCH (ret))
1233 {
1234 tempwidth = 1;
1235 ret = 1;
1236 }
1237 else if (MB_NULLWCH (ret))
1238 tempwidth = 0;
1239 else
1240 tempwidth = wcwidth (wc);
1241
1242 if (tempwidth > 0)
1243 {
1244 int count;
1245 bytes = ret;
1246 for (count = 0; count < bytes; count++)
1247 putc (new[count], rl_outstream);
1248 _rl_last_c_pos = tempwidth;
1249 _rl_last_v_pos++;
1250 memset (&ps, 0, sizeof (mbstate_t));
1251 ret = mbrtowc (&wc, old, MB_CUR_MAX, &ps);
1252 if (ret != 0 && bytes != 0)
1253 {
1254 if (MB_INVALIDCH (ret))
1255 memmove (old+bytes, old+1, strlen (old+1));
1256 else
1257 memmove (old+bytes, old+ret, strlen (old+ret));
1258 memcpy (old, new, bytes);
1259 }
1260 }
1261 else
1262 {
1263 putc (' ', rl_outstream);
1264 _rl_last_c_pos = 1;
1265 _rl_last_v_pos++;
1266 if (old[0] && new[0])
1267 old[0] = new[0];
1268 }
1269 }
1270 else
1271#endif
1272 {
1273 if (new[0])
1274 putc (new[0], rl_outstream);
1275 else
1276 putc (' ', rl_outstream);
1277 _rl_last_c_pos = 1;
1278 _rl_last_v_pos++;
1279 if (old[0] && new[0])
1280 old[0] = new[0];
1281 }
1282 }
1283
1284
1285 /* Find first difference. */
1286#if defined (HANDLE_MULTIBYTE)
1287 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1288 {
1289 /* See if the old line is a subset of the new line, so that the
1290 only change is adding characters. */
1291 temp = (omax < nmax) ? omax : nmax;
1292 if (memcmp (old, new, temp) == 0)
1293 {
1294 ofd = old + temp;
1295 nfd = new + temp;
1296 }
1297 else
1298 {
1299 memset (&ps_new, 0, sizeof(mbstate_t));
1300 memset (&ps_old, 0, sizeof(mbstate_t));
1301
1302 if (omax == nmax && STREQN (new, old, omax))
1303 {
1304 ofd = old + omax;
1305 nfd = new + nmax;
1306 }
1307 else
1308 {
1309 new_offset = old_offset = 0;
1310 for (ofd = old, nfd = new;
1311 (ofd - old < omax) && *ofd &&
1312 _rl_compare_chars(old, old_offset, &ps_old, new, new_offset, &ps_new); )
1313 {
1314 old_offset = _rl_find_next_mbchar (old, old_offset, 1, MB_FIND_ANY);
1315 new_offset = _rl_find_next_mbchar (new, new_offset, 1, MB_FIND_ANY);
1316 ofd = old + old_offset;
1317 nfd = new + new_offset;
1318 }
1319 }
1320 }
1321 }
1322 else
1323#endif
1324 for (ofd = old, nfd = new;
1325 (ofd - old < omax) && *ofd && (*ofd == *nfd);
1326 ofd++, nfd++)
1327 ;
1328
1329 /* Move to the end of the screen line. ND and OD are used to keep track
1330 of the distance between ne and new and oe and old, respectively, to
1331 move a subtraction out of each loop. */
1332 for (od = ofd - old, oe = ofd; od < omax && *oe; oe++, od++);
1333 for (nd = nfd - new, ne = nfd; nd < nmax && *ne; ne++, nd++);
1334
1335 /* If no difference, continue to next line. */
1336 if (ofd == oe && nfd == ne)
1337 return;
1338
1339 wsatend = 1; /* flag for trailing whitespace */
1340
1341#if defined (HANDLE_MULTIBYTE)
1342 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1343 {
1344 ols = old + _rl_find_prev_mbchar (old, oe - old, MB_FIND_ANY);
1345 nls = new + _rl_find_prev_mbchar (new, ne - new, MB_FIND_ANY);
1346 while ((ols > ofd) && (nls > nfd))
1347 {
1348 memset (&ps_old, 0, sizeof (mbstate_t));
1349 memset (&ps_new, 0, sizeof (mbstate_t));
1350
1351#if 0
1352 /* On advice from jir@yamato.ibm.com */
1353 _rl_adjust_point (old, ols - old, &ps_old);
1354 _rl_adjust_point (new, nls - new, &ps_new);
1355#endif
1356
1357 if (_rl_compare_chars (old, ols - old, &ps_old, new, nls - new, &ps_new) == 0)
1358 break;
1359
1360 if (*ols == ' ')
1361 wsatend = 0;
1362
1363 ols = old + _rl_find_prev_mbchar (old, ols - old, MB_FIND_ANY);
1364 nls = new + _rl_find_prev_mbchar (new, nls - new, MB_FIND_ANY);
1365 }
1366 }
1367 else
1368 {
1369#endif /* HANDLE_MULTIBYTE */
1370 ols = oe - 1; /* find last same */
1371 nls = ne - 1;
1372 while ((ols > ofd) && (nls > nfd) && (*ols == *nls))
1373 {
1374 if (*ols != ' ')
1375 wsatend = 0;
1376 ols--;
1377 nls--;
1378 }
1379#if defined (HANDLE_MULTIBYTE)
1380 }
1381#endif
1382
1383 if (wsatend)
1384 {
1385 ols = oe;
1386 nls = ne;
1387 }
1388#if defined (HANDLE_MULTIBYTE)
1389 /* This may not work for stateful encoding, but who cares? To handle
1390 stateful encoding properly, we have to scan each string from the
1391 beginning and compare. */
1392 else if (_rl_compare_chars (ols, 0, NULL, nls, 0, NULL) == 0)
1393#else
1394 else if (*ols != *nls)
1395#endif
1396 {
1397 if (*ols) /* don't step past the NUL */
1398 {
1399 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1400 ols = old + _rl_find_next_mbchar (old, ols - old, 1, MB_FIND_ANY);
1401 else
1402 ols++;
1403 }
1404 if (*nls)
1405 {
1406 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1407 nls = new + _rl_find_next_mbchar (new, nls - new, 1, MB_FIND_ANY);
1408 else
1409 nls++;
1410 }
1411 }
1412
1413 /* count of invisible characters in the current invisible line. */
1414 current_invis_chars = W_OFFSET (current_line, wrap_offset);
1415 if (_rl_last_v_pos != current_line)
1416 {
1417 _rl_move_vert (current_line);
1418 if ((MB_CUR_MAX == 1 || rl_byte_oriented) && current_line == 0 && visible_wrap_offset)
1419 _rl_last_c_pos += visible_wrap_offset;
1420 }
1421
1422 /* If this is the first line and there are invisible characters in the
1423 prompt string, and the prompt string has not changed, and the current
1424 cursor position is before the last invisible character in the prompt,
1425 and the index of the character to move to is past the end of the prompt
1426 string, then redraw the entire prompt string. We can only do this
1427 reliably if the terminal supports a `cr' capability.
1428
1429 This is not an efficiency hack -- there is a problem with redrawing
1430 portions of the prompt string if they contain terminal escape
1431 sequences (like drawing the `unbold' sequence without a corresponding
1432 `bold') that manifests itself on certain terminals. */
1433
1434 lendiff = local_prompt_len;
1435 od = ofd - old; /* index of first difference in visible line */
1436 if (current_line == 0 && !_rl_horizontal_scroll_mode &&
1437 _rl_term_cr && lendiff > prompt_visible_length && _rl_last_c_pos > 0 &&
1438 od >= lendiff && _rl_last_c_pos < PROMPT_ENDING_INDEX)
1439 {
1440#if defined (__MSDOS__)
1441 putc ('\r', rl_outstream);
1442#else
1443 tputs (_rl_term_cr, 1, _rl_output_character_function);
1444#endif
1445 _rl_output_some_chars (local_prompt, lendiff);
1446 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1447 {
1448 /* We take wrap_offset into account here so we can pass correct
1449 information to _rl_move_cursor_relative. */
1450 _rl_last_c_pos = _rl_col_width (local_prompt, 0, lendiff) - wrap_offset;
1451 cpos_adjusted = 1;
1452 }
1453 else
1454 _rl_last_c_pos = lendiff;
1455 }
1456
1457 /* When this function returns, _rl_last_c_pos is correct, and an absolute
1458 cursor postion in multibyte mode, but a buffer index when not in a
1459 multibyte locale. */
1460 _rl_move_cursor_relative (od, old);
1461#if 1
1462#if defined (HANDLE_MULTIBYTE)
1463 /* We need to indicate that the cursor position is correct in the presence of
1464 invisible characters in the prompt string. Let's see if setting this when
1465 we make sure we're at the end of the drawn prompt string works. */
1466 if (current_line == 0 && MB_CUR_MAX > 1 && rl_byte_oriented == 0 && _rl_last_c_pos == prompt_physical_chars)
1467 cpos_adjusted = 1;
1468#endif
1469#endif
1470
1471 /* if (len (new) > len (old))
1472 lendiff == difference in buffer
1473 col_lendiff == difference on screen
1474 When not using multibyte characters, these are equal */
1475 lendiff = (nls - nfd) - (ols - ofd);
1476 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1477 col_lendiff = _rl_col_width (new, nfd - new, nls - new) - _rl_col_width (old, ofd - old, ols - old);
1478 else
1479 col_lendiff = lendiff;
1480
1481 /* If we are changing the number of invisible characters in a line, and
1482 the spot of first difference is before the end of the invisible chars,
1483 lendiff needs to be adjusted. */
1484 if (current_line == 0 && !_rl_horizontal_scroll_mode &&
1485 current_invis_chars != visible_wrap_offset)
1486 {
1487 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1488 {
1489 lendiff += visible_wrap_offset - current_invis_chars;
1490 col_lendiff += visible_wrap_offset - current_invis_chars;
1491 }
1492 else
1493 {
1494 lendiff += visible_wrap_offset - current_invis_chars;
1495 col_lendiff = lendiff;
1496 }
1497 }
1498
1499 /* Insert (diff (len (old), len (new)) ch. */
1500 temp = ne - nfd;
1501 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1502 col_temp = _rl_col_width (new, nfd - new, ne - new);
1503 else
1504 col_temp = temp;
1505
1506 if (col_lendiff > 0) /* XXX - was lendiff */
1507 {
1508 /* Non-zero if we're increasing the number of lines. */
1509 int gl = current_line >= _rl_vis_botlin && inv_botlin > _rl_vis_botlin;
1510 /* Sometimes it is cheaper to print the characters rather than
1511 use the terminal's capabilities. If we're growing the number
1512 of lines, make sure we actually cause the new line to wrap
1513 around on auto-wrapping terminals. */
1514 if (_rl_terminal_can_insert && ((2 * col_temp) >= col_lendiff || _rl_term_IC) && (!_rl_term_autowrap || !gl))
1515 {
1516 /* If lendiff > prompt_visible_length and _rl_last_c_pos == 0 and
1517 _rl_horizontal_scroll_mode == 1, inserting the characters with
1518 _rl_term_IC or _rl_term_ic will screw up the screen because of the
1519 invisible characters. We need to just draw them. */
1520 if (*ols && (!_rl_horizontal_scroll_mode || _rl_last_c_pos > 0 ||
1521 lendiff <= prompt_visible_length || !current_invis_chars))
1522 {
1523 insert_some_chars (nfd, lendiff, col_lendiff);
1524 _rl_last_c_pos += col_lendiff;
1525 }
1526 else if ((MB_CUR_MAX == 1 || rl_byte_oriented != 0) && *ols == 0 && lendiff > 0)
1527 {
1528 /* At the end of a line the characters do not have to
1529 be "inserted". They can just be placed on the screen. */
1530 /* However, this screws up the rest of this block, which
1531 assumes you've done the insert because you can. */
1532 _rl_output_some_chars (nfd, lendiff);
1533 _rl_last_c_pos += col_lendiff;
1534 }
1535 else
1536 {
1537 /* We have horizontal scrolling and we are not inserting at
1538 the end. We have invisible characters in this line. This
1539 is a dumb update. */
1540 _rl_output_some_chars (nfd, temp);
1541 _rl_last_c_pos += col_temp;
1542 return;
1543 }
1544 /* Copy (new) chars to screen from first diff to last match. */
1545 temp = nls - nfd;
1546 if ((temp - lendiff) > 0)
1547 {
1548 _rl_output_some_chars (nfd + lendiff, temp - lendiff);
1549#if 1
1550 /* XXX -- this bears closer inspection. Fixes a redisplay bug
1551 reported against bash-3.0-alpha by Andreas Schwab involving
1552 multibyte characters and prompt strings with invisible
1553 characters, but was previously disabled. */
1554 _rl_last_c_pos += _rl_col_width (nfd+lendiff, 0, temp-col_lendiff);
1555#else
1556 _rl_last_c_pos += _rl_col_width (nfd+lendiff, 0, temp-lendiff);
1557#endif
1558 }
1559 }
1560 else
1561 {
1562 /* cannot insert chars, write to EOL */
1563 _rl_output_some_chars (nfd, temp);
1564 _rl_last_c_pos += col_temp;
1565 /* If we're in a multibyte locale and were before the last invisible
1566 char in the current line (which implies we just output some invisible
1567 characters) we need to adjust _rl_last_c_pos, since it represents
1568 a physical character position. */
1569 }
1570 }
1571 else /* Delete characters from line. */
1572 {
1573 /* If possible and inexpensive to use terminal deletion, then do so. */
1574 if (_rl_term_dc && (2 * col_temp) >= -col_lendiff)
1575 {
1576 /* If all we're doing is erasing the invisible characters in the
1577 prompt string, don't bother. It screws up the assumptions
1578 about what's on the screen. */
1579 if (_rl_horizontal_scroll_mode && _rl_last_c_pos == 0 &&
1580 -lendiff == visible_wrap_offset)
1581 col_lendiff = 0;
1582
1583 if (col_lendiff)
1584 delete_chars (-col_lendiff); /* delete (diff) characters */
1585
1586 /* Copy (new) chars to screen from first diff to last match */
1587 temp = nls - nfd;
1588 if (temp > 0)
1589 {
1590 _rl_output_some_chars (nfd, temp);
1591 _rl_last_c_pos += _rl_col_width (nfd, 0, temp);;
1592 }
1593 }
1594 /* Otherwise, print over the existing material. */
1595 else
1596 {
1597 if (temp > 0)
1598 {
1599 _rl_output_some_chars (nfd, temp);
1600 _rl_last_c_pos += col_temp; /* XXX */
1601 }
1602 lendiff = (oe - old) - (ne - new);
1603 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1604 col_lendiff = _rl_col_width (old, 0, oe - old) - _rl_col_width (new, 0, ne - new);
1605 else
1606 col_lendiff = lendiff;
1607
1608 if (col_lendiff)
1609 {
1610 if (_rl_term_autowrap && current_line < inv_botlin)
1611 space_to_eol (col_lendiff);
1612 else
1613 _rl_clear_to_eol (col_lendiff);
1614 }
1615 }
1616 }
1617}
1618
1619/* Tell the update routines that we have moved onto a new (empty) line. */
1620int
1621rl_on_new_line ()
1622{
1623 if (visible_line)
1624 visible_line[0] = '\0';
1625
1626 _rl_last_c_pos = _rl_last_v_pos = 0;
1627 _rl_vis_botlin = last_lmargin = 0;
1628 if (vis_lbreaks)
1629 vis_lbreaks[0] = vis_lbreaks[1] = 0;
1630 visible_wrap_offset = 0;
1631 return 0;
1632}
1633
1634/* Tell the update routines that we have moved onto a new line with the
1635 prompt already displayed. Code originally from the version of readline
1636 distributed with CLISP. rl_expand_prompt must have already been called
1637 (explicitly or implicitly). This still doesn't work exactly right. */
1638int
1639rl_on_new_line_with_prompt ()
1640{
1641 int prompt_size, i, l, real_screenwidth, newlines;
1642 char *prompt_last_line, *lprompt;
1643
1644 /* Initialize visible_line and invisible_line to ensure that they can hold
1645 the already-displayed prompt. */
1646 prompt_size = strlen (rl_prompt) + 1;
1647 init_line_structures (prompt_size);
1648
1649 /* Make sure the line structures hold the already-displayed prompt for
1650 redisplay. */
1651 lprompt = local_prompt ? local_prompt : rl_prompt;
1652 strcpy (visible_line, lprompt);
1653 strcpy (invisible_line, lprompt);
1654
1655 /* If the prompt contains newlines, take the last tail. */
1656 prompt_last_line = strrchr (rl_prompt, '\n');
1657 if (!prompt_last_line)
1658 prompt_last_line = rl_prompt;
1659
1660 l = strlen (prompt_last_line);
1661 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1662 _rl_last_c_pos = _rl_col_width (prompt_last_line, 0, l); /* XXX */
1663 else
1664 _rl_last_c_pos = l;
1665
1666 /* Dissect prompt_last_line into screen lines. Note that here we have
1667 to use the real screenwidth. Readline's notion of screenwidth might be
1668 one less, see terminal.c. */
1669 real_screenwidth = _rl_screenwidth + (_rl_term_autowrap ? 0 : 1);
1670 _rl_last_v_pos = l / real_screenwidth;
1671 /* If the prompt length is a multiple of real_screenwidth, we don't know
1672 whether the cursor is at the end of the last line, or already at the
1673 beginning of the next line. Output a newline just to be safe. */
1674 if (l > 0 && (l % real_screenwidth) == 0)
1675 _rl_output_some_chars ("\n", 1);
1676 last_lmargin = 0;
1677
1678 newlines = 0; i = 0;
1679 while (i <= l)
1680 {
1681 _rl_vis_botlin = newlines;
1682 vis_lbreaks[newlines++] = i;
1683 i += real_screenwidth;
1684 }
1685 vis_lbreaks[newlines] = l;
1686 visible_wrap_offset = 0;
1687
1688 rl_display_prompt = rl_prompt; /* XXX - make sure it's set */
1689
1690 return 0;
1691}
1692
1693/* Actually update the display, period. */
1694int
1695rl_forced_update_display ()
1696{
1697 register char *temp;
1698
1699 if (visible_line)
1700 {
1701 temp = visible_line;
1702 while (*temp)
1703 *temp++ = '\0';
1704 }
1705 rl_on_new_line ();
1706 forced_display++;
1707 (*rl_redisplay_function) ();
1708 return 0;
1709}
1710
1711/* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices.
1712 (Well, when we don't have multibyte characters, _rl_last_c_pos is a
1713 buffer index.)
1714 DATA is the contents of the screen line of interest; i.e., where
1715 the movement is being done. */
1716void
1717_rl_move_cursor_relative (new, data)
1718 int new;
1719 const char *data;
1720{
1721 register int i;
1722 int woff; /* number of invisible chars on current line */
1723 int cpos, dpos; /* current and desired cursor positions */
1724
1725 woff = W_OFFSET (_rl_last_v_pos, wrap_offset);
1726 cpos = _rl_last_c_pos;
1727#if defined (HANDLE_MULTIBYTE)
1728 /* If we have multibyte characters, NEW is indexed by the buffer point in
1729 a multibyte string, but _rl_last_c_pos is the display position. In
1730 this case, NEW's display position is not obvious and must be
1731 calculated. We need to account for invisible characters in this line,
1732 as long as we are past them and they are counted by _rl_col_width. */
1733 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1734 {
1735 dpos = _rl_col_width (data, 0, new);
1736 if (dpos > prompt_last_invisible) /* XXX - don't use woff here */
1737 {
1738 dpos -= woff;
1739 /* Since this will be assigned to _rl_last_c_pos at the end (more
1740 precisely, _rl_last_c_pos == dpos when this function returns),
1741 let the caller know. */
1742 cpos_adjusted = 1;
1743 }
1744 }
1745 else
1746#endif
1747 dpos = new;
1748
1749 /* If we don't have to do anything, then return. */
1750 if (cpos == dpos)
1751 return;
1752
1753 /* It may be faster to output a CR, and then move forwards instead
1754 of moving backwards. */
1755 /* i == current physical cursor position. */
1756#if defined (HANDLE_MULTIBYTE)
1757 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1758 i = _rl_last_c_pos;
1759 else
1760#endif
1761 i = _rl_last_c_pos - woff;
1762 if (dpos == 0 || CR_FASTER (dpos, _rl_last_c_pos) ||
1763 (_rl_term_autowrap && i == _rl_screenwidth))
1764 {
1765#if defined (__MSDOS__)
1766 putc ('\r', rl_outstream);
1767#else
1768 tputs (_rl_term_cr, 1, _rl_output_character_function);
1769#endif /* !__MSDOS__ */
1770 cpos = _rl_last_c_pos = 0;
1771 }
1772
1773 if (cpos < dpos)
1774 {
1775 /* Move the cursor forward. We do it by printing the command
1776 to move the cursor forward if there is one, else print that
1777 portion of the output buffer again. Which is cheaper? */
1778
1779 /* The above comment is left here for posterity. It is faster
1780 to print one character (non-control) than to print a control
1781 sequence telling the terminal to move forward one character.
1782 That kind of control is for people who don't know what the
1783 data is underneath the cursor. */
1784
1785 /* However, we need a handle on where the current display position is
1786 in the buffer for the immediately preceding comment to be true.
1787 In multibyte locales, we don't currently have that info available.
1788 Without it, we don't know where the data we have to display begins
1789 in the buffer and we have to go back to the beginning of the screen
1790 line. In this case, we can use the terminal sequence to move forward
1791 if it's available. */
1792 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1793 {
1794 if (_rl_term_forward_char)
1795 {
1796 for (i = cpos; i < dpos; i++)
1797 tputs (_rl_term_forward_char, 1, _rl_output_character_function);
1798 }
1799 else
1800 {
1801 tputs (_rl_term_cr, 1, _rl_output_character_function);
1802 for (i = 0; i < new; i++)
1803 putc (data[i], rl_outstream);
1804 }
1805 }
1806 else
1807 for (i = cpos; i < new; i++)
1808 putc (data[i], rl_outstream);
1809 }
1810
1811#if defined (HANDLE_MULTIBYTE)
1812 /* NEW points to the buffer point, but _rl_last_c_pos is the display point.
1813 The byte length of the string is probably bigger than the column width
1814 of the string, which means that if NEW == _rl_last_c_pos, then NEW's
1815 display point is less than _rl_last_c_pos. */
1816#endif
1817 else if (cpos > dpos)
1818 _rl_backspace (cpos - dpos);
1819
1820 _rl_last_c_pos = dpos;
1821}
1822
1823/* PWP: move the cursor up or down. */
1824void
1825_rl_move_vert (to)
1826 int to;
1827{
1828 register int delta, i;
1829
1830 if (_rl_last_v_pos == to || to > _rl_screenheight)
1831 return;
1832
1833 if ((delta = to - _rl_last_v_pos) > 0)
1834 {
1835 for (i = 0; i < delta; i++)
1836 putc ('\n', rl_outstream);
1837#if defined (__MSDOS__)
1838 putc ('\r', rl_outstream);
1839#else
1840 tputs (_rl_term_cr, 1, _rl_output_character_function);
1841#endif
1842 _rl_last_c_pos = 0;
1843 }
1844 else
1845 { /* delta < 0 */
1846 if (_rl_term_up && *_rl_term_up)
1847 for (i = 0; i < -delta; i++)
1848 tputs (_rl_term_up, 1, _rl_output_character_function);
1849 }
1850
1851 _rl_last_v_pos = to; /* Now TO is here */
1852}
1853
1854/* Physically print C on rl_outstream. This is for functions which know
1855 how to optimize the display. Return the number of characters output. */
1856int
1857rl_show_char (c)
1858 int c;
1859{
1860 int n = 1;
1861 if (META_CHAR (c) && (_rl_output_meta_chars == 0))
1862 {
1863 fprintf (rl_outstream, "M-");
1864 n += 2;
1865 c = UNMETA (c);
1866 }
1867
1868#if defined (DISPLAY_TABS)
1869 if ((CTRL_CHAR (c) && c != '\t') || c == RUBOUT)
1870#else
1871 if (CTRL_CHAR (c) || c == RUBOUT)
1872#endif /* !DISPLAY_TABS */
1873 {
1874 fprintf (rl_outstream, "C-");
1875 n += 2;
1876 c = CTRL_CHAR (c) ? UNCTRL (c) : '?';
1877 }
1878
1879 putc (c, rl_outstream);
1880 fflush (rl_outstream);
1881 return n;
1882}
1883
1884int
1885rl_character_len (c, pos)
1886 register int c, pos;
1887{
1888 unsigned char uc;
1889
1890 uc = (unsigned char)c;
1891
1892 if (META_CHAR_FOR_UCHAR(uc))
1893 return ((_rl_output_meta_chars == 0) ? 4 : 1);
1894
1895 if (uc == '\t')
1896 {
1897#if defined (DISPLAY_TABS)
1898 return (((pos | 7) + 1) - pos);
1899#else
1900 return (2);
1901#endif /* !DISPLAY_TABS */
1902 }
1903
1904 if (CTRL_CHAR (c) || c == RUBOUT)
1905 return (2);
1906
1907 return ((ISPRINT (uc)) ? 1 : 2);
1908}
1909/* How to print things in the "echo-area". The prompt is treated as a
1910 mini-modeline. */
1911static int msg_saved_prompt = 0;
1912
1913#if defined (USE_VARARGS)
1914int
1915#if defined (PREFER_STDARG)
1916rl_message (const char *format, ...)
1917#else
1918rl_message (va_alist)
1919 va_dcl
1920#endif
1921{
1922 va_list args;
1923#if defined (PREFER_VARARGS)
1924 char *format;
1925#endif
1926
1927#if defined (PREFER_STDARG)
1928 va_start (args, format);
1929#else
1930 va_start (args);
1931 format = va_arg (args, char *);
1932#endif
1933
1934#if defined (HAVE_VSNPRINTF)
1935 vsnprintf (msg_buf, sizeof (msg_buf) - 1, format, args);
1936#else
1937 vsprintf (msg_buf, format, args);
1938 msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */
1939#endif
1940 va_end (args);
1941
1942 if (saved_local_prompt == 0)
1943 {
1944 rl_save_prompt ();
1945 msg_saved_prompt = 1;
1946 }
1947 rl_display_prompt = msg_buf;
1948 local_prompt = expand_prompt (msg_buf, &prompt_visible_length,
1949 &prompt_last_invisible,
1950 &prompt_invis_chars_first_line,
1951 &prompt_physical_chars);
1952 local_prompt_prefix = (char *)NULL;
1953 local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
1954 (*rl_redisplay_function) ();
1955
1956 return 0;
1957}
1958#else /* !USE_VARARGS */
1959int
1960rl_message (format, arg1, arg2)
1961 char *format;
1962{
1963 sprintf (msg_buf, format, arg1, arg2);
1964 msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */
1965
1966 rl_display_prompt = msg_buf;
1967 if (saved_local_prompt == 0)
1968 {
1969 rl_save_prompt ();
1970 msg_saved_prompt = 1;
1971 }
1972 local_prompt = expand_prompt (msg_buf, &prompt_visible_length,
1973 &prompt_last_invisible,
1974 &prompt_invis_chars_first_line,
1975 &prompt_physical_chars);
1976 local_prompt_prefix = (char *)NULL;
1977 local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
1978 (*rl_redisplay_function) ();
1979
1980 return 0;
1981}
1982#endif /* !USE_VARARGS */
1983
1984/* How to clear things from the "echo-area". */
1985int
1986rl_clear_message ()
1987{
1988 rl_display_prompt = rl_prompt;
1989 if (msg_saved_prompt)
1990 {
1991 rl_restore_prompt ();
1992 msg_saved_prompt = 0;
1993 }
1994 (*rl_redisplay_function) ();
1995 return 0;
1996}
1997
1998int
1999rl_reset_line_state ()
2000{
2001 rl_on_new_line ();
2002
2003 rl_display_prompt = rl_prompt ? rl_prompt : "";
2004 forced_display = 1;
2005 return 0;
2006}
2007
2008void
2009rl_save_prompt ()
2010{
2011 saved_local_prompt = local_prompt;
2012 saved_local_prefix = local_prompt_prefix;
2013 saved_prefix_length = prompt_prefix_length;
2014 saved_local_length = local_prompt_len;
2015 saved_last_invisible = prompt_last_invisible;
2016 saved_visible_length = prompt_visible_length;
2017 saved_invis_chars_first_line = prompt_invis_chars_first_line;
2018 saved_physical_chars = prompt_physical_chars;
2019
2020 local_prompt = local_prompt_prefix = (char *)0;
2021 local_prompt_len = 0;
2022 prompt_last_invisible = prompt_visible_length = prompt_prefix_length = 0;
2023 prompt_invis_chars_first_line = prompt_physical_chars = 0;
2024}
2025
2026void
2027rl_restore_prompt ()
2028{
2029 FREE (local_prompt);
2030 FREE (local_prompt_prefix);
2031
2032 local_prompt = saved_local_prompt;
2033 local_prompt_prefix = saved_local_prefix;
2034 local_prompt_len = saved_local_length;
2035 prompt_prefix_length = saved_prefix_length;
2036 prompt_last_invisible = saved_last_invisible;
2037 prompt_visible_length = saved_visible_length;
2038 prompt_invis_chars_first_line = saved_invis_chars_first_line;
2039 prompt_physical_chars = saved_physical_chars;
2040
2041 /* can test saved_local_prompt to see if prompt info has been saved. */
2042 saved_local_prompt = saved_local_prefix = (char *)0;
2043 saved_local_length = 0;
2044 saved_last_invisible = saved_visible_length = saved_prefix_length = 0;
2045 saved_invis_chars_first_line = saved_physical_chars = 0;
2046}
2047
2048char *
2049_rl_make_prompt_for_search (pchar)
2050 int pchar;
2051{
2052 int len;
2053 char *pmt, *p;
2054
2055 rl_save_prompt ();
2056
2057 /* We've saved the prompt, and can do anything with the various prompt
2058 strings we need before they're restored. We want the unexpanded
2059 portion of the prompt string after any final newline. */
2060 p = rl_prompt ? strrchr (rl_prompt, '\n') : 0;
2061 if (p == 0)
2062 {
2063 len = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0;
2064 pmt = (char *)xmalloc (len + 2);
2065 if (len)
2066 strcpy (pmt, rl_prompt);
2067 pmt[len] = pchar;
2068 pmt[len+1] = '\0';
2069 }
2070 else
2071 {
2072 p++;
2073 len = strlen (p);
2074 pmt = (char *)xmalloc (len + 2);
2075 if (len)
2076 strcpy (pmt, p);
2077 pmt[len] = pchar;
2078 pmt[len+1] = '\0';
2079 }
2080
2081 /* will be overwritten by expand_prompt, called from rl_message */
2082 prompt_physical_chars = saved_physical_chars + 1;
2083 return pmt;
2084}
2085
2086/* Quick redisplay hack when erasing characters at the end of the line. */
2087void
2088_rl_erase_at_end_of_line (l)
2089 int l;
2090{
2091 register int i;
2092
2093 _rl_backspace (l);
2094 for (i = 0; i < l; i++)
2095 putc (' ', rl_outstream);
2096 _rl_backspace (l);
2097 for (i = 0; i < l; i++)
2098 visible_line[--_rl_last_c_pos] = '\0';
2099 rl_display_fixed++;
2100}
2101
2102/* Clear to the end of the line. COUNT is the minimum
2103 number of character spaces to clear, */
2104void
2105_rl_clear_to_eol (count)
2106 int count;
2107{
2108 if (_rl_term_clreol)
2109 tputs (_rl_term_clreol, 1, _rl_output_character_function);
2110 else if (count)
2111 space_to_eol (count);
2112}
2113
2114/* Clear to the end of the line using spaces. COUNT is the minimum
2115 number of character spaces to clear, */
2116static void
2117space_to_eol (count)
2118 int count;
2119{
2120 register int i;
2121
2122 for (i = 0; i < count; i++)
2123 putc (' ', rl_outstream);
2124
2125 _rl_last_c_pos += count;
2126}
2127
2128void
2129_rl_clear_screen ()
2130{
2131 if (_rl_term_clrpag)
2132 tputs (_rl_term_clrpag, 1, _rl_output_character_function);
2133 else
2134 rl_crlf ();
2135}
2136
2137/* Insert COUNT characters from STRING to the output stream at column COL. */
2138static void
2139insert_some_chars (string, count, col)
2140 char *string;
2141 int count, col;
2142{
2143#if defined (__MSDOS__) || defined (__MINGW32__)
2144 _rl_output_some_chars (string, count);
2145#else
2146 /* DEBUGGING */
2147 if (MB_CUR_MAX == 1 || rl_byte_oriented)
2148 if (count != col)
2149 fprintf(stderr, "readline: debug: insert_some_chars: count (%d) != col (%d)\n", count, col);
2150
2151 /* If IC is defined, then we do not have to "enter" insert mode. */
2152 if (_rl_term_IC)
2153 {
2154 char *buffer;
2155
2156 buffer = tgoto (_rl_term_IC, 0, col);
2157 tputs (buffer, 1, _rl_output_character_function);
2158 _rl_output_some_chars (string, count);
2159 }
2160 else
2161 {
2162 register int i;
2163
2164 /* If we have to turn on insert-mode, then do so. */
2165 if (_rl_term_im && *_rl_term_im)
2166 tputs (_rl_term_im, 1, _rl_output_character_function);
2167
2168 /* If there is a special command for inserting characters, then
2169 use that first to open up the space. */
2170 if (_rl_term_ic && *_rl_term_ic)
2171 {
2172 for (i = col; i--; )
2173 tputs (_rl_term_ic, 1, _rl_output_character_function);
2174 }
2175
2176 /* Print the text. */
2177 _rl_output_some_chars (string, count);
2178
2179 /* If there is a string to turn off insert mode, we had best use
2180 it now. */
2181 if (_rl_term_ei && *_rl_term_ei)
2182 tputs (_rl_term_ei, 1, _rl_output_character_function);
2183 }
2184#endif /* __MSDOS__ || __MINGW32__ */
2185}
2186
2187/* Delete COUNT characters from the display line. */
2188static void
2189delete_chars (count)
2190 int count;
2191{
2192 if (count > _rl_screenwidth) /* XXX */
2193 return;
2194
2195#if !defined (__MSDOS__) && !defined (__MINGW32__)
2196 if (_rl_term_DC && *_rl_term_DC)
2197 {
2198 char *buffer;
2199 buffer = tgoto (_rl_term_DC, count, count);
2200 tputs (buffer, count, _rl_output_character_function);
2201 }
2202 else
2203 {
2204 if (_rl_term_dc && *_rl_term_dc)
2205 while (count--)
2206 tputs (_rl_term_dc, 1, _rl_output_character_function);
2207 }
2208#endif /* !__MSDOS__ && !__MINGW32__ */
2209}
2210
2211void
2212_rl_update_final ()
2213{
2214 int full_lines;
2215
2216 full_lines = 0;
2217 /* If the cursor is the only thing on an otherwise-blank last line,
2218 compensate so we don't print an extra CRLF. */
2219 if (_rl_vis_botlin && _rl_last_c_pos == 0 &&
2220 visible_line[vis_lbreaks[_rl_vis_botlin]] == 0)
2221 {
2222 _rl_vis_botlin--;
2223 full_lines = 1;
2224 }
2225 _rl_move_vert (_rl_vis_botlin);
2226 /* If we've wrapped lines, remove the final xterm line-wrap flag. */
2227 if (full_lines && _rl_term_autowrap && (VIS_LLEN(_rl_vis_botlin) == _rl_screenwidth))
2228 {
2229 char *last_line;
2230
2231 last_line = &visible_line[vis_lbreaks[_rl_vis_botlin]];
2232 cpos_buffer_position = -1; /* don't know where we are in buffer */
2233 _rl_move_cursor_relative (_rl_screenwidth - 1, last_line); /* XXX */
2234 _rl_clear_to_eol (0);
2235 putc (last_line[_rl_screenwidth - 1], rl_outstream);
2236 }
2237 _rl_vis_botlin = 0;
2238 rl_crlf ();
2239 fflush (rl_outstream);
2240 rl_display_fixed++;
2241}
2242
2243/* Move to the start of the current line. */
2244static void
2245cr ()
2246{
2247 if (_rl_term_cr)
2248 {
2249#if defined (__MSDOS__)
2250 putc ('\r', rl_outstream);
2251#else
2252 tputs (_rl_term_cr, 1, _rl_output_character_function);
2253#endif
2254 _rl_last_c_pos = 0;
2255 }
2256}
2257
2258/* Redraw the last line of a multi-line prompt that may possibly contain
2259 terminal escape sequences. Called with the cursor at column 0 of the
2260 line to draw the prompt on. */
2261static void
2262redraw_prompt (t)
2263 char *t;
2264{
2265 const char *oldp;
2266
2267 oldp = rl_display_prompt;
2268 rl_save_prompt ();
2269
2270 rl_display_prompt = t;
2271 local_prompt = expand_prompt (t, &prompt_visible_length,
2272 &prompt_last_invisible,
2273 &prompt_invis_chars_first_line,
2274 &prompt_physical_chars);
2275 local_prompt_prefix = (char *)NULL;
2276 local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
2277
2278 rl_forced_update_display ();
2279
2280 rl_display_prompt = oldp;
2281 rl_restore_prompt();
2282}
2283
2284/* Redisplay the current line after a SIGWINCH is received. */
2285void
2286_rl_redisplay_after_sigwinch ()
2287{
2288 char *t;
2289
2290 /* Clear the current line and put the cursor at column 0. Make sure
2291 the right thing happens if we have wrapped to a new screen line. */
2292 if (_rl_term_cr)
2293 {
2294#if defined (__MSDOS__)
2295 putc ('\r', rl_outstream);
2296#else
2297 tputs (_rl_term_cr, 1, _rl_output_character_function);
2298#endif
2299 _rl_last_c_pos = 0;
2300#if defined (__MSDOS__)
2301 space_to_eol (_rl_screenwidth);
2302 putc ('\r', rl_outstream);
2303#else
2304 if (_rl_term_clreol)
2305 tputs (_rl_term_clreol, 1, _rl_output_character_function);
2306 else
2307 {
2308 space_to_eol (_rl_screenwidth);
2309 tputs (_rl_term_cr, 1, _rl_output_character_function);
2310 }
2311#endif
2312 if (_rl_last_v_pos > 0)
2313 _rl_move_vert (0);
2314 }
2315 else
2316 rl_crlf ();
2317
2318 /* Redraw only the last line of a multi-line prompt. */
2319 t = strrchr (rl_display_prompt, '\n');
2320 if (t)
2321 redraw_prompt (++t);
2322 else
2323 rl_forced_update_display ();
2324}
2325
2326void
2327_rl_clean_up_for_exit ()
2328{
2329 if (readline_echoing_p)
2330 {
2331 _rl_move_vert (_rl_vis_botlin);
2332 _rl_vis_botlin = 0;
2333 fflush (rl_outstream);
2334 rl_restart_output (1, 0);
2335 }
2336}
2337
2338void
2339_rl_erase_entire_line ()
2340{
2341 cr ();
2342 _rl_clear_to_eol (0);
2343 cr ();
2344 fflush (rl_outstream);
2345}
2346
2347/* return the `current display line' of the cursor -- the number of lines to
2348 move up to get to the first screen line of the current readline line. */
2349int
2350_rl_current_display_line ()
2351{
2352 int ret, nleft;
2353
2354 /* Find out whether or not there might be invisible characters in the
2355 editing buffer. */
2356 if (rl_display_prompt == rl_prompt)
2357 nleft = _rl_last_c_pos - _rl_screenwidth - rl_visible_prompt_length;
2358 else
2359 nleft = _rl_last_c_pos - _rl_screenwidth;
2360
2361 if (nleft > 0)
2362 ret = 1 + nleft / _rl_screenwidth;
2363 else
2364 ret = 0;
2365
2366 return ret;
2367}
2368
2369#if defined (HANDLE_MULTIBYTE)
2370/* Calculate the number of screen columns occupied by STR from START to END.
2371 In the case of multibyte characters with stateful encoding, we have to
2372 scan from the beginning of the string to take the state into account. */
2373static int
2374_rl_col_width (str, start, end)
2375 const char *str;
2376 int start, end;
2377{
2378 wchar_t wc;
2379 mbstate_t ps;
2380 int tmp, point, width, max;
2381
2382 if (end <= start)
2383 return 0;
2384
2385 memset (&ps, 0, sizeof (mbstate_t));
2386
2387 point = 0;
2388 max = end;
2389
2390 while (point < start)
2391 {
2392 tmp = mbrlen (str + point, max, &ps);
2393 if (MB_INVALIDCH ((size_t)tmp))
2394 {
2395 /* In this case, the bytes are invalid or too short to compose a
2396 multibyte character, so we assume that the first byte represents
2397 a single character. */
2398 point++;
2399 max--;
2400
2401 /* Clear the state of the byte sequence, because in this case the
2402 effect of mbstate is undefined. */
2403 memset (&ps, 0, sizeof (mbstate_t));
2404 }
2405 else if (MB_NULLWCH (tmp))
2406 break; /* Found '\0' */
2407 else
2408 {
2409 point += tmp;
2410 max -= tmp;
2411 }
2412 }
2413
2414 /* If START is not a byte that starts a character, then POINT will be
2415 greater than START. In this case, assume that (POINT - START) gives
2416 a byte count that is the number of columns of difference. */
2417 width = point - start;
2418
2419 while (point < end)
2420 {
2421 tmp = mbrtowc (&wc, str + point, max, &ps);
2422 if (MB_INVALIDCH ((size_t)tmp))
2423 {
2424 /* In this case, the bytes are invalid or too short to compose a
2425 multibyte character, so we assume that the first byte represents
2426 a single character. */
2427 point++;
2428 max--;
2429
2430 /* and assume that the byte occupies a single column. */
2431 width++;
2432
2433 /* Clear the state of the byte sequence, because in this case the
2434 effect of mbstate is undefined. */
2435 memset (&ps, 0, sizeof (mbstate_t));
2436 }
2437 else if (MB_NULLWCH (tmp))
2438 break; /* Found '\0' */
2439 else
2440 {
2441 point += tmp;
2442 max -= tmp;
2443 tmp = wcwidth(wc);
2444 width += (tmp >= 0) ? tmp : 1;
2445 }
2446 }
2447
2448 width += point - end;
2449
2450 return width;
2451}
2452#endif /* HANDLE_MULTIBYTE */
2453