2/* display.c -- readline redisplay facility. */
3
4/* Copyright (C) 1987-2005 Free Software Foundation, Inc.
5
6 This file is part of the GNU Readline Library, a library for
7 reading lines of text with interactive input and history editing.
8
9 The GNU Readline Library is free software; you can redistribute it
10 and/or modify it under the terms of the GNU General Public License
11 as published by the Free Software Foundation; either version 2, or
12 (at your option) any later version.
13
14 The GNU Readline Library is distributed in the hope that it will be
15 useful, but WITHOUT ANY WARRANTY; without even the implied warranty
16 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 The GNU General Public License is often shipped with GNU software, and
20 is generally kept in a file called COPYING or LICENSE. If you do not
21 have a copy of the license, write to the Free Software Foundation,
22 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
23#define READLINE_LIBRARY
24
25#if defined (HAVE_CONFIG_H)
26# include <config.h>
27#endif
28
29#include <sys/types.h>
30
31#if defined (HAVE_UNISTD_H)
32# include <unistd.h>
33#endif /* HAVE_UNISTD_H */
34
35#include "posixstat.h"
36
37#if defined (HAVE_STDLIB_H)
38# include <stdlib.h>
39#else
40# include "ansi_stdlib.h"
41#endif /* HAVE_STDLIB_H */
42
43#include <stdio.h>
44
45/* System-specific feature definitions and include files. */
46#include "rldefs.h"
47#include "rlmbutil.h"
48
49/* Termcap library stuff. */
50#include "tcap.h"
51
52/* Some standard library routines. */
53#include "readline.h"
54#include "history.h"
55
56#include "rlprivate.h"
57#include "xmalloc.h"
58
59#if !defined (strchr) && !defined (__STDC__)
60extern char *strchr (), *strrchr ();
61#endif /* !strchr && !__STDC__ */
62
63#if defined (HACK_TERMCAP_MOTION)
64extern char *_rl_term_forward_char;
65#endif
66
67static void update_line PARAMS((char *, char *, int, int, int, int));
68static void space_to_eol PARAMS((int));
69static void delete_chars PARAMS((int));
70static void insert_some_chars PARAMS((char *, int, int));
71static void cr PARAMS((void));
72
73#if defined (HANDLE_MULTIBYTE)
74static int _rl_col_width PARAMS((const char *, int, int));
75static int *_rl_wrapped_line;
76#else
77# define _rl_col_width(l, s, e) (((e) <= (s)) ? 0 : (e) - (s))
78#endif
79
80static int *inv_lbreaks, *vis_lbreaks;
81static int inv_lbsize, vis_lbsize;
82
83/* Heuristic used to decide whether it is faster to move from CUR to NEW
84 by backing up or outputting a carriage return and moving forward. */
85#define CR_FASTER(new, cur) (((new) + 1) < ((cur) - (new)))
86
87/* **************************************************************** */
88/* */
89/* Display stuff */
90/* */
91/* **************************************************************** */
92
93/* This is the stuff that is hard for me. I never seem to write good
94 display routines in C. Let's see how I do this time. */
95
96/* (PWP) Well... Good for a simple line updater, but totally ignores
97 the problems of input lines longer than the screen width.
98
99 update_line and the code that calls it makes a multiple line,
100 automatically wrapping line update. Careful attention needs
101 to be paid to the vertical position variables. */
102
103/* Keep two buffers; one which reflects the current contents of the
104 screen, and the other to draw what we think the new contents should
105 be. Then compare the buffers, and make whatever changes to the
106 screen itself that we should. Finally, make the buffer that we
107 just drew into be the one which reflects the current contents of the
108 screen, and place the cursor where it belongs.
109
110 Commands that want to can fix the display themselves, and then let
111 this function know that the display has been fixed by setting the
112 RL_DISPLAY_FIXED variable. This is good for efficiency. */
113
114/* Application-specific redisplay function. */
115rl_voidfunc_t *rl_redisplay_function = rl_redisplay;
116
117/* Global variables declared here. */
118/* What YOU turn on when you have handled all redisplay yourself. */
119int rl_display_fixed = 0;
120
121int _rl_suppress_redisplay = 0;
122int _rl_want_redisplay = 0;
123
124/* The stuff that gets printed out before the actual text of the line.
125 This is usually pointing to rl_prompt. */
126char *rl_display_prompt = (char *)NULL;
127
128/* Pseudo-global variables declared here. */
129
130/* The visible cursor position. If you print some text, adjust this. */
131/* NOTE: _rl_last_c_pos is used as a buffer index when not in a locale
132 supporting multibyte characters, and an absolute cursor position when
133 in such a locale. This is an artifact of the donated multibyte support.
134 Care must be taken when modifying its value. */
135int _rl_last_c_pos = 0;
136int _rl_last_v_pos = 0;
137
138static int cpos_adjusted;
139
140/* Number of lines currently on screen minus 1. */
141int _rl_vis_botlin = 0;
142
143/* Variables used only in this file. */
144/* The last left edge of text that was displayed. This is used when
145 doing horizontal scrolling. It shifts in thirds of a screenwidth. */
146static int last_lmargin;
147
148/* The line display buffers. One is the line currently displayed on
149 the screen. The other is the line about to be displayed. */
150static char *visible_line = (char *)NULL;
151static char *invisible_line = (char *)NULL;
152
153/* A buffer for `modeline' messages. */
154static char msg_buf[128];
155
156/* Non-zero forces the redisplay even if we thought it was unnecessary. */
157static int forced_display;
158
159/* Default and initial buffer size. Can grow. */
160static int line_size = 1024;
161
162/* Variables to keep track of the expanded prompt string, which may
163 include invisible characters. */
164
165static char *local_prompt, *local_prompt_prefix;
166static int prompt_visible_length, prompt_prefix_length;
167
168/* The number of invisible characters in the line currently being
169 displayed on the screen. */
170static int visible_wrap_offset;
171
172/* The number of invisible characters in the prompt string. Static so it
173 can be shared between rl_redisplay and update_line */
174static int wrap_offset;
175
176/* The index of the last invisible character in the prompt string. */
177static int prompt_last_invisible;
178
179/* The length (buffer offset) of the first line of the last (possibly
180 multi-line) buffer displayed on the screen. */
181static int visible_first_line_len;
182
183/* Number of invisible characters on the first physical line of the prompt.
184 Only valid when the number of physical characters in the prompt exceeds
185 (or is equal to) _rl_screenwidth. */
186static int prompt_invis_chars_first_line;
187
188static int prompt_last_screen_line;
189
190static int prompt_physical_chars;
191
192/* Variables to save and restore prompt and display information. */
193
194/* These are getting numerous enough that it's time to create a struct. */
195
196static char *saved_local_prompt;
197static char *saved_local_prefix;
198static int saved_last_invisible;
199static int saved_visible_length;
200static int saved_prefix_length;
201static int saved_invis_chars_first_line;
202static int saved_physical_chars;
203
204/* Expand the prompt string S and return the number of visible
205 characters in *LP, if LP is not null. This is currently more-or-less
206 a placeholder for expansion. LIP, if non-null is a place to store the
207 index of the last invisible character in the returned string. NIFLP,
208 if non-zero, is a place to store the number of invisible characters in
209 the first prompt line. The previous are used as byte counts -- indexes
210 into a character buffer. */
211
212/* Current implementation:
213 \001 (^A) start non-visible characters
214 \002 (^B) end non-visible characters
215 all characters except \001 and \002 (following a \001) are copied to
216 the returned string; all characters except those between \001 and
217 \002 are assumed to be `visible'. */
218
219static char *
220expand_prompt (pmt, lp, lip, niflp, vlp)
221 char *pmt;
222 int *lp, *lip, *niflp, *vlp;
223{
224 char *r, *ret, *p;
225 int l, rl, last, ignoring, ninvis, invfl, invflset, ind, pind, physchars;
226
227 /* Short-circuit if we can. */
228 if ((MB_CUR_MAX <= 1 || rl_byte_oriented) && strchr (pmt, RL_PROMPT_START_IGNORE) == 0)
229 {
230 r = savestring (pmt);
231 if (lp)
232 *lp = strlen (r);
233 if (lip)
234 *lip = 0;
235 if (niflp)
236 *niflp = 0;
237 if (vlp)
238 *vlp = lp ? *lp : strlen (r);
239 return r;
240 }
241
242 l = strlen (pmt);
243 r = ret = (char *)xmalloc (l + 1);
244
245 invfl = 0; /* invisible chars in first line of prompt */
246 invflset = 0; /* we only want to set invfl once */
247
248 for (rl = ignoring = last = ninvis = physchars = 0, p = pmt; p && *p; p++)
249 {
250 /* This code strips the invisible character string markers
251 RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */
252 if (*p == RL_PROMPT_START_IGNORE)
253 {
254 ignoring++;
255 continue;
256 }
257 else if (ignoring && *p == RL_PROMPT_END_IGNORE)
258 {
259 ignoring = 0;
260 if (p[-1] != RL_PROMPT_START_IGNORE)
261 last = r - ret - 1;
262 continue;
263 }
264 else
265 {
266#if defined (HANDLE_MULTIBYTE)
267 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
268 {
269 pind = p - pmt;
270 ind = _rl_find_next_mbchar (pmt, pind, 1, MB_FIND_NONZERO);
271 l = ind - pind;
272 while (l--)
273 *r++ = *p++;
274 if (!ignoring)
275 {
276 rl += ind - pind;
277 physchars += _rl_col_width (pmt, pind, ind);
278 }
279 else
280 ninvis += ind - pind;
281 p--; /* compensate for later increment */
282 }
283 else
284#endif
285 {
286 *r++ = *p;
287 if (!ignoring)
288 {
289 rl++; /* visible length byte counter */
290 physchars++;
291 }
292 else
293 ninvis++; /* invisible chars byte counter */
294 }
295
296 if (invflset == 0 && rl >= _rl_screenwidth)
297 {
298 invfl = ninvis;
299 invflset = 1;
300 }
301 }
302 }
303
304 if (rl < _rl_screenwidth)
305 invfl = ninvis;
306
307 *r = '\0';
308 if (lp)
309 *lp = rl;
310 if (lip)
311 *lip = last;
312 if (niflp)
313 *niflp = invfl;
314 if (vlp)
315 *vlp = physchars;
316 return ret;
317}
318
319/* Just strip out RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE from
320 PMT and return the rest of PMT. */
321char *
322_rl_strip_prompt (pmt)
323 char *pmt;
324{
325 char *ret;
326
327 ret = expand_prompt (pmt, (int *)NULL, (int *)NULL, (int *)NULL, (int *)NULL);
328 return ret;
329}
330
331/*
332 * Expand the prompt string into the various display components, if
333 * necessary.
334 *
335 * local_prompt = expanded last line of string in rl_display_prompt
336 * (portion after the final newline)
337 * local_prompt_prefix = portion before last newline of rl_display_prompt,
338 * expanded via expand_prompt
339 * prompt_visible_length = number of visible characters in local_prompt
340 * prompt_prefix_length = number of visible characters in local_prompt_prefix
341 *
342 * This function is called once per call to readline(). It may also be
343 * called arbitrarily to expand the primary prompt.
344 *
345 * The return value is the number of visible characters on the last line
346 * of the (possibly multi-line) prompt.
347 */
348int
349rl_expand_prompt (prompt)
350 char *prompt;
351{
352 char *p, *t;
353 int c;
354
355 /* Clear out any saved values. */
356 FREE (local_prompt);
357 FREE (local_prompt_prefix);
358
359 local_prompt = local_prompt_prefix = (char *)0;
360 prompt_last_invisible = prompt_invis_chars_first_line = 0;
361 prompt_visible_length = prompt_physical_chars = 0;
362
363 if (prompt == 0 || *prompt == 0)
364 return (0);
365
366 p = strrchr (prompt, '\n');
367 if (!p)
368 {
369 /* The prompt is only one logical line, though it might wrap. */
370 local_prompt = expand_prompt (prompt, &prompt_visible_length,
371 &prompt_last_invisible,
372 &prompt_invis_chars_first_line,
373 &prompt_physical_chars);
374 local_prompt_prefix = (char *)0;
375 return (prompt_visible_length);
376 }
377 else
378 {
379 /* The prompt spans multiple lines. */
380 t = ++p;
381 local_prompt = expand_prompt (p, &prompt_visible_length,
382 &prompt_last_invisible,
383 (int *)NULL,
384 &prompt_physical_chars);
385 c = *t; *t = '\0';
386 /* The portion of the prompt string up to and including the
387 final newline is now null-terminated. */
388 local_prompt_prefix = expand_prompt (prompt, &prompt_prefix_length,
389 (int *)NULL,
390 &prompt_invis_chars_first_line,
391 (int *)NULL);
392 *t = c;
393 return (prompt_prefix_length);
394 }
395}
396
397/* Initialize the VISIBLE_LINE and INVISIBLE_LINE arrays, and their associated
398 arrays of line break markers. MINSIZE is the minimum size of VISIBLE_LINE
399 and INVISIBLE_LINE; if it is greater than LINE_SIZE, LINE_SIZE is
400 increased. If the lines have already been allocated, this ensures that
401 they can hold at least MINSIZE characters. */
402static void
403init_line_structures (minsize)
404 int minsize;
405{
406 register int n;
407
408 if (invisible_line == 0) /* initialize it */
409 {
410 if (line_size < minsize)
411 line_size = minsize;
412 visible_line = (char *)xmalloc (line_size);
413 invisible_line = (char *)xmalloc (line_size);
414 }
415 else if (line_size < minsize) /* ensure it can hold MINSIZE chars */
416 {
417 line_size *= 2;
418 if (line_size < minsize)
419 line_size = minsize;
420 visible_line = (char *)xrealloc (visible_line, line_size);
421 invisible_line = (char *)xrealloc (invisible_line, line_size);
422 }
423
424 for (n = minsize; n < line_size; n++)
425 {
426 visible_line[n] = 0;
427 invisible_line[n] = 1;
428 }
429
430 if (vis_lbreaks == 0)
431 {
432 /* should be enough. */
433 inv_lbsize = vis_lbsize = 256;
434 inv_lbreaks = (int *)xmalloc (inv_lbsize * sizeof (int));
435 vis_lbreaks = (int *)xmalloc (vis_lbsize * sizeof (int));
436#if defined (HANDLE_MULTIBYTE)
437 _rl_wrapped_line = (int *)xmalloc (vis_lbsize * sizeof (int));
438#endif
439 inv_lbreaks[0] = vis_lbreaks[0] = 0;
440 }
441}
442
443/* Basic redisplay algorithm. */
444void
445rl_redisplay ()
446{
447 register int in, out, c, linenum, cursor_linenum;
448 register char *line;
449 int c_pos, inv_botlin, lb_botlin, lb_linenum, o_cpos;
450 int newlines, lpos, temp, modmark, n0, num;
451 char *prompt_this_line;
452#if defined (HANDLE_MULTIBYTE)
453 wchar_t wc;
454 size_t wc_bytes;
455 int wc_width;
456 mbstate_t ps;
457 int _rl_wrapped_multicolumn = 0;
458#endif
459
460 if (!readline_echoing_p)
461 return;
462
463 if (!rl_display_prompt)
464 rl_display_prompt = "";
465
466 if (invisible_line == 0 || vis_lbreaks == 0)
467 {
468 init_line_structures (0);
469 rl_on_new_line ();
470 }
471
472 /* Draw the line into the buffer. */
473 c_pos = -1;
474
475 line = invisible_line;
476 out = inv_botlin = 0;
477
478 /* Mark the line as modified or not. We only do this for history
479 lines. */
480 modmark = 0;
481 if (_rl_mark_modified_lines && current_history () && rl_undo_list)
482 {
483 line[out++] = '*';
484 line[out] = '\0';
485 modmark = 1;
486 }
487
488 /* If someone thought that the redisplay was handled, but the currently
489 visible line has a different modification state than the one about
490 to become visible, then correct the caller's misconception. */
491 if (visible_line[0] != invisible_line[0])
492 rl_display_fixed = 0;
493
494 /* If the prompt to be displayed is the `primary' readline prompt (the
495 one passed to readline()), use the values we have already expanded.
496 If not, use what's already in rl_display_prompt. WRAP_OFFSET is the
497 number of non-visible characters in the prompt string. */
498 if (rl_display_prompt == rl_prompt || local_prompt)
499 {
500 int local_len = local_prompt ? strlen (local_prompt) : 0;
501 if (local_prompt_prefix && forced_display)
502 _rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix));
503
504 if (local_len > 0)
505 {
506 temp = local_len + out + 2;
507 if (temp >= line_size)
508 {
509 line_size = (temp + 1024) - (temp % 1024);
510 visible_line = (char *)xrealloc (visible_line, line_size);
511 line = invisible_line = (char *)xrealloc (invisible_line, line_size);
512 }
513 strncpy (line + out, local_prompt, local_len);
514 out += local_len;
515 }
516 line[out] = '\0';
517 wrap_offset = local_len - prompt_visible_length;
518 }
519 else
520 {
521 int pmtlen;
522 prompt_this_line = strrchr (rl_display_prompt, '\n');
523 if (!prompt_this_line)
524 prompt_this_line = rl_display_prompt;
525 else
526 {
527 prompt_this_line++;
528 pmtlen = prompt_this_line - rl_display_prompt; /* temp var */
529 if (forced_display)
530 {
531 _rl_output_some_chars (rl_display_prompt, pmtlen);
532 /* Make sure we are at column zero even after a newline,
533 regardless of the state of terminal output processing. */
534 if (pmtlen < 2 || prompt_this_line[-2] != '\r')
535 cr ();
536 }
537 }
538
539 prompt_physical_chars = pmtlen = strlen (prompt_this_line);
540 temp = pmtlen + out + 2;
541 if (temp >= line_size)
542 {
543 line_size = (temp + 1024) - (temp % 1024);
544 visible_line = (char *)xrealloc (visible_line, line_size);
545 line = invisible_line = (char *)xrealloc (invisible_line, line_size);
546 }
547 strncpy (line + out, prompt_this_line, pmtlen);
548 out += pmtlen;
549 line[out] = '\0';
550 wrap_offset = prompt_invis_chars_first_line = 0;
551 }
552
553#define CHECK_INV_LBREAKS() \
554 do { \
555 if (newlines >= (inv_lbsize - 2)) \
556 { \
557 inv_lbsize *= 2; \
558 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
559 } \
560 } while (0)
561
562#if defined (HANDLE_MULTIBYTE)
563#define CHECK_LPOS() \
564 do { \
565 lpos++; \
566 if (lpos >= _rl_screenwidth) \
567 { \
568 if (newlines >= (inv_lbsize - 2)) \
569 { \
570 inv_lbsize *= 2; \
571 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
572 _rl_wrapped_line = (int *)xrealloc (_rl_wrapped_line, inv_lbsize * sizeof (int)); \
573 } \
574 inv_lbreaks[++newlines] = out; \
575 _rl_wrapped_line[newlines] = _rl_wrapped_multicolumn; \
576 lpos = 0; \
577 } \
578 } while (0)
579#else
580#define CHECK_LPOS() \
581 do { \
582 lpos++; \
583 if (lpos >= _rl_screenwidth) \
584 { \
585 if (newlines >= (inv_lbsize - 2)) \
586 { \
587 inv_lbsize *= 2; \
588 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
589 } \
590 inv_lbreaks[++newlines] = out; \
591 lpos = 0; \
592 } \
593 } while (0)
594#endif
595
596 /* inv_lbreaks[i] is where line i starts in the buffer. */
597 inv_lbreaks[newlines = 0] = 0;
598#if 0
599 lpos = out - wrap_offset;
600#else
601 lpos = prompt_physical_chars + modmark;
602#endif
603
604#if defined (HANDLE_MULTIBYTE)
605 memset (_rl_wrapped_line, 0, vis_lbsize);
606 num = 0;
607#endif
608
609 /* prompt_invis_chars_first_line is the number of invisible characters in
610 the first physical line of the prompt.
611 wrap_offset - prompt_invis_chars_first_line is the number of invis
612 chars on the second line. */
613
614 /* what if lpos is already >= _rl_screenwidth before we start drawing the
615 contents of the command line? */
616 while (lpos >= _rl_screenwidth)
617 {
618 /* fix from Darin Johnson <darin@acuson.com> for prompt string with
619 invisible characters that is longer than the screen width. The
620 prompt_invis_chars_first_line variable could be made into an array
621 saying how many invisible characters there are per line, but that's
622 probably too much work for the benefit gained. How many people have
623 prompts that exceed two physical lines?
624 Additional logic fix from Edward Catmur <ed@catmur.co.uk> */
625#if defined (HANDLE_MULTIBYTE)
626 n0 = num;
627 temp = local_prompt ? strlen (local_prompt) : 0;
628 while (num < temp)
629 {
630 if (_rl_col_width (local_prompt, n0, num) > _rl_screenwidth)
631 {
632 num = _rl_find_prev_mbchar (local_prompt, num, MB_FIND_ANY);
633 break;
634 }
635 num++;
636 }
637 temp = num +
638#else
639 temp = ((newlines + 1) * _rl_screenwidth) +
640#endif /* !HANDLE_MULTIBYTE */
641 ((local_prompt_prefix == 0) ? ((newlines == 0) ? prompt_invis_chars_first_line
642 : ((newlines == 1) ? wrap_offset : 0))
643 : ((newlines == 0) ? wrap_offset :0));
644
645 inv_lbreaks[++newlines] = temp;
646#if defined (HANDLE_MULTIBYTE)
647 lpos -= _rl_col_width (local_prompt, n0, num);
648#else
649 lpos -= _rl_screenwidth;
650#endif
651 }
652
653 prompt_last_screen_line = newlines;
654
655 /* Draw the rest of the line (after the prompt) into invisible_line, keeping
656 track of where the cursor is (c_pos), the number of the line containing
657 the cursor (lb_linenum), the last line number (lb_botlin and inv_botlin).
658 It maintains an array of line breaks for display (inv_lbreaks).
659 This handles expanding tabs for display and displaying meta characters. */
660 lb_linenum = 0;
661#if defined (HANDLE_MULTIBYTE)
662 in = 0;
663 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
664 {
665 memset (&ps, 0, sizeof (mbstate_t));
666 wc_bytes = mbrtowc (&wc, rl_line_buffer, rl_end, &ps);
667 }
668 else
669 wc_bytes = 1;
670 while (in < rl_end)
671#else
672 for (in = 0; in < rl_end; in++)
673#endif
674 {
675 c = (unsigned char)rl_line_buffer[in];
676
677#if defined (HANDLE_MULTIBYTE)
678 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
679 {
680 if (MB_INVALIDCH (wc_bytes))
681 {
682 /* Byte sequence is invalid or shortened. Assume that the
683 first byte represents a character. */
684 wc_bytes = 1;
685 /* Assume that a character occupies a single column. */
686 wc_width = 1;
687 memset (&ps, 0, sizeof (mbstate_t));
688 }
689 else if (MB_NULLWCH (wc_bytes))
690 break; /* Found '\0' */
691 else
692 {
693 temp = wcwidth (wc);
694 wc_width = (temp >= 0) ? temp : 1;
695 }
696 }
697#endif
698
699 if (out + 8 >= line_size) /* XXX - 8 for \t */
700 {
701 line_size *= 2;
702 visible_line = (char *)xrealloc (visible_line, line_size);
703 invisible_line = (char *)xrealloc (invisible_line, line_size);
704 line = invisible_line;
705 }
706
707 if (in == rl_point)
708 {
709 c_pos = out;
710 lb_linenum = newlines;
711 }
712
713#if defined (HANDLE_MULTIBYTE)
714 if (META_CHAR (c) && _rl_output_meta_chars == 0) /* XXX - clean up */
715#else
716 if (META_CHAR (c))
717#endif
718 {
719 if (_rl_output_meta_chars == 0)
720 {
721 sprintf (line + out, "\\%o", c);
722
723 if (lpos + 4 >= _rl_screenwidth)
724 {
725 temp = _rl_screenwidth - lpos;
726 CHECK_INV_LBREAKS ();
727 inv_lbreaks[++newlines] = out + temp;
728 lpos = 4 - temp;
729 }
730 else
731 lpos += 4;
732
733 out += 4;
734 }
735 else
736 {
737 line[out++] = c;
738 CHECK_LPOS();
739 }
740 }
741#if defined (DISPLAY_TABS)
742 else if (c == '\t')
743 {
744 register int newout;
745
746#if 0
747 newout = (out | (int)7) + 1;
748#else
749 newout = out + 8 - lpos % 8;
750#endif
751 temp = newout - out;
752 if (lpos + temp >= _rl_screenwidth)
753 {
754 register int temp2;
755 temp2 = _rl_screenwidth - lpos;
756 CHECK_INV_LBREAKS ();
757 inv_lbreaks[++newlines] = out + temp2;
758 lpos = temp - temp2;
759 while (out < newout)
760 line[out++] = ' ';
761 }
762 else
763 {
764 while (out < newout)
765 line[out++] = ' ';
766 lpos += temp;
767 }
768 }
769#endif
770 else if (c == '\n' && _rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up)
771 {
772 line[out++] = '\0'; /* XXX - sentinel */
773 CHECK_INV_LBREAKS ();
774 inv_lbreaks[++newlines] = out;
775 lpos = 0;
776 }
777 else if (CTRL_CHAR (c) || c == RUBOUT)
778 {
779 line[out++] = '^';
780 CHECK_LPOS();
781 line[out++] = CTRL_CHAR (c) ? UNCTRL (c) : '?';
782 CHECK_LPOS();
783 }
784 else
785 {
786#if defined (HANDLE_MULTIBYTE)
787 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
788 {
789 register int i;
790
791 _rl_wrapped_multicolumn = 0;
792
793 if (_rl_screenwidth < lpos + wc_width)
794 for (i = lpos; i < _rl_screenwidth; i++)
795 {
796 /* The space will be removed in update_line() */
797 line[out++] = ' ';
798 _rl_wrapped_multicolumn++;
799 CHECK_LPOS();
800 }
801 if (in == rl_point)
802 {
803 c_pos = out;
804 lb_linenum = newlines;
805 }
806 for (i = in; i < in+wc_bytes; i++)
807 line[out++] = rl_line_buffer[i];
808 for (i = 0; i < wc_width; i++)
809 CHECK_LPOS();
810 }
811 else
812 {
813 line[out++] = c;
814 CHECK_LPOS();
815 }
816#else
817 line[out++] = c;
818 CHECK_LPOS();
819#endif
820 }
821
822#if defined (HANDLE_MULTIBYTE)
823 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
824 {
825 in += wc_bytes;
826 wc_bytes = mbrtowc (&wc, rl_line_buffer + in, rl_end - in, &ps);
827 }
828 else
829 in++;
830#endif
831
832 }
833 line[out] = '\0';
834 if (c_pos < 0)
835 {
836 c_pos = out;
837 lb_linenum = newlines;
838 }
839
840 inv_botlin = lb_botlin = newlines;
841 CHECK_INV_LBREAKS ();
842 inv_lbreaks[newlines+1] = out;
843 cursor_linenum = lb_linenum;
844
845 /* C_POS == position in buffer where cursor should be placed.
846 CURSOR_LINENUM == line number where the cursor should be placed. */
847
848 /* PWP: now is when things get a bit hairy. The visible and invisible
849 line buffers are really multiple lines, which would wrap every
850 (screenwidth - 1) characters. Go through each in turn, finding
851 the changed region and updating it. The line order is top to bottom. */
852
853 /* If we can move the cursor up and down, then use multiple lines,
854 otherwise, let long lines display in a single terminal line, and
855 horizontally scroll it. */
856
857 if (_rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up)
858 {
859 int nleft, pos, changed_screen_line, tx;
860
861 if (!rl_display_fixed || forced_display)
862 {
863 forced_display = 0;
864
865 /* If we have more than a screenful of material to display, then
866 only display a screenful. We should display the last screen,
867 not the first. */
868 if (out >= _rl_screenchars)
869 {
870 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
871 out = _rl_find_prev_mbchar (line, _rl_screenchars, MB_FIND_ANY);
872 else
873 out = _rl_screenchars - 1;
874 }
875
876 /* The first line is at character position 0 in the buffer. The
877 second and subsequent lines start at inv_lbreaks[N], offset by
878 OFFSET (which has already been calculated above). */
879
880#define W_OFFSET(line, offset) ((line) == 0 ? offset : 0)
881#define VIS_LLEN(l) ((l) > _rl_vis_botlin ? 0 : (vis_lbreaks[l+1] - vis_lbreaks[l]))
882#define INV_LLEN(l) (inv_lbreaks[l+1] - inv_lbreaks[l])
883#define VIS_CHARS(line) (visible_line + vis_lbreaks[line])
884#define VIS_LINE(line) ((line) > _rl_vis_botlin) ? "" : VIS_CHARS(line)
885#define INV_LINE(line) (invisible_line + inv_lbreaks[line])
886
887 /* For each line in the buffer, do the updating display. */
888 for (linenum = 0; linenum <= inv_botlin; linenum++)
889 {
890 o_cpos = _rl_last_c_pos;
891 cpos_adjusted = 0;
892 update_line (VIS_LINE(linenum), INV_LINE(linenum), linenum,
893 VIS_LLEN(linenum), INV_LLEN(linenum), inv_botlin);
894
895 /* update_line potentially changes _rl_last_c_pos, but doesn't
896 take invisible characters into account, since _rl_last_c_pos
897 is an absolute cursor position in a multibyte locale. See
898 if compensating here is the right thing, or if we have to
899 change update_line itself. There is one case in which
900 update_line adjusts _rl_last_c_pos itself (so it can pass
901 _rl_move_cursor_relative accurate values); it communicates
902 this back by setting cpos_adjusted */
903 if (linenum == 0 && (MB_CUR_MAX > 1 && rl_byte_oriented == 0) &&
904 cpos_adjusted == 0 &&
905 _rl_last_c_pos != o_cpos &&
906 _rl_last_c_pos > wrap_offset &&
907 o_cpos < prompt_last_invisible)
908 _rl_last_c_pos -= wrap_offset;
909
910 /* If this is the line with the prompt, we might need to
911 compensate for invisible characters in the new line. Do
912 this only if there is not more than one new line (which
913 implies that we completely overwrite the old visible line)
914 and the new line is shorter than the old. Make sure we are
915 at the end of the new line before clearing. */
916 if (linenum == 0 &&
917 inv_botlin == 0 && _rl_last_c_pos == out &&
918 (wrap_offset > visible_wrap_offset) &&
919 (_rl_last_c_pos < visible_first_line_len))
920 {
921 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
922 nleft = _rl_screenwidth - _rl_last_c_pos;
923 else
924 nleft = _rl_screenwidth + wrap_offset - _rl_last_c_pos;
925 if (nleft)
926 _rl_clear_to_eol (nleft);
927 }
928
929 /* Since the new first line is now visible, save its length. */
930 if (linenum == 0)
931 visible_first_line_len = (inv_botlin > 0) ? inv_lbreaks[1] : out - wrap_offset;
932 }
933
934 /* We may have deleted some lines. If so, clear the left over
935 blank ones at the bottom out. */
936 if (_rl_vis_botlin > inv_botlin)
937 {
938 char *tt;
939 for (; linenum <= _rl_vis_botlin; linenum++)
940 {
941 tt = VIS_CHARS (linenum);
942 _rl_move_vert (linenum);
943 _rl_move_cursor_relative (0, tt);
944 _rl_clear_to_eol
945 ((linenum == _rl_vis_botlin) ? strlen (tt) : _rl_screenwidth);
946 }
947 }
948 _rl_vis_botlin = inv_botlin;
949
950 /* CHANGED_SCREEN_LINE is set to 1 if we have moved to a
951 different screen line during this redisplay. */
952 changed_screen_line = _rl_last_v_pos != cursor_linenum;
953 if (changed_screen_line)
954 {
955 _rl_move_vert (cursor_linenum);
956 /* If we moved up to the line with the prompt using _rl_term_up,
957 the physical cursor position on the screen stays the same,
958 but the buffer position needs to be adjusted to account
959 for invisible characters. */
960 if ((MB_CUR_MAX == 1 || rl_byte_oriented) && cursor_linenum == 0 && wrap_offset)
961 _rl_last_c_pos += wrap_offset;
962 }
963
964 /* We have to reprint the prompt if it contains invisible
965 characters, since it's not generally OK to just reprint
966 the characters from the current cursor position. But we
967 only need to reprint it if the cursor is before the last
968 invisible character in the prompt string. */
969 nleft = prompt_visible_length + wrap_offset;
970 if (cursor_linenum == 0 && wrap_offset > 0 && _rl_last_c_pos > 0 &&
971 _rl_last_c_pos <= prompt_last_invisible && local_prompt)
972 {
973#if defined (__MSDOS__)
974 putc ('\r', rl_outstream);
975#else
976 if (_rl_term_cr)
977 tputs (_rl_term_cr, 1, _rl_output_character_function);
978#endif
979 _rl_output_some_chars (local_prompt, nleft);
980 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
981 _rl_last_c_pos = _rl_col_width (local_prompt, 0, nleft) - wrap_offset;
982 else
983 _rl_last_c_pos = nleft;
984 }
985
986 /* Where on that line? And where does that line start
987 in the buffer? */
988 pos = inv_lbreaks[cursor_linenum];
989 /* nleft == number of characters in the line buffer between the
990 start of the line and the cursor position. */
991 nleft = c_pos - pos;
992
993 /* NLEFT is now a number of characters in a buffer. When in a
994 multibyte locale, however, _rl_last_c_pos is an absolute cursor
995 position that doesn't take invisible characters in the prompt
996 into account. We use a fudge factor to compensate. */
997
998 /* Since _rl_backspace() doesn't know about invisible characters in the
999 prompt, and there's no good way to tell it, we compensate for
1000 those characters here and call _rl_backspace() directly. */
1001 if (wrap_offset && cursor_linenum == 0 && nleft < _rl_last_c_pos)
1002 {
1003 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1004 tx = _rl_col_width (&visible_line[pos], 0, nleft) - visible_wrap_offset;
1005 else
1006 tx = nleft;
1007 if (_rl_last_c_pos > tx)
1008 {
1009 _rl_backspace (_rl_last_c_pos - tx); /* XXX */
1010 _rl_last_c_pos = tx;
1011 }
1012 }
1013
1014 /* We need to note that in a multibyte locale we are dealing with
1015 _rl_last_c_pos as an absolute cursor position, but moving to a
1016 point specified by a buffer position (NLEFT) that doesn't take
1017 invisible characters into account. */
1018 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1019 _rl_move_cursor_relative (nleft, &invisible_line[pos]);
1020 else if (nleft != _rl_last_c_pos)
1021 _rl_move_cursor_relative (nleft, &invisible_line[pos]);
1022 }
1023 }
1024 else /* Do horizontal scrolling. */
1025 {
1026#define M_OFFSET(margin, offset) ((margin) == 0 ? offset : 0)
1027 int lmargin, ndisp, nleft, phys_c_pos, t;
1028
1029 /* Always at top line. */
1030 _rl_last_v_pos = 0;
1031
1032 /* Compute where in the buffer the displayed line should start. This
1033 will be LMARGIN. */
1034
1035 /* The number of characters that will be displayed before the cursor. */
1036 ndisp = c_pos - wrap_offset;
1037 nleft = prompt_visible_length + wrap_offset;
1038 /* Where the new cursor position will be on the screen. This can be
1039 longer than SCREENWIDTH; if it is, lmargin will be adjusted. */
1040 phys_c_pos = c_pos - (last_lmargin ? last_lmargin : wrap_offset);
1041 t = _rl_screenwidth / 3;
1042
1043 /* If the number of characters had already exceeded the screenwidth,
1044 last_lmargin will be > 0. */
1045
1046 /* If the number of characters to be displayed is more than the screen
1047 width, compute the starting offset so that the cursor is about
1048 two-thirds of the way across the screen. */
1049 if (phys_c_pos > _rl_screenwidth - 2)
1050 {
1051 lmargin = c_pos - (2 * t);
1052 if (lmargin < 0)
1053 lmargin = 0;
1054 /* If the left margin would be in the middle of a prompt with
1055 invisible characters, don't display the prompt at all. */
1056 if (wrap_offset && lmargin > 0 && lmargin < nleft)
1057 lmargin = nleft;
1058 }
1059 else if (ndisp < _rl_screenwidth - 2) /* XXX - was -1 */
1060 lmargin = 0;
1061 else if (phys_c_pos < 1)
1062 {
1063 /* If we are moving back towards the beginning of the line and
1064 the last margin is no longer correct, compute a new one. */
1065 lmargin = ((c_pos - 1) / t) * t; /* XXX */
1066 if (wrap_offset && lmargin > 0 && lmargin < nleft)
1067 lmargin = nleft;
1068 }
1069 else
1070 lmargin = last_lmargin;
1071
1072 /* If the first character on the screen isn't the first character
1073 in the display line, indicate this with a special character. */
1074 if (lmargin > 0)
1075 line[lmargin] = '<';
1076
1077 /* If SCREENWIDTH characters starting at LMARGIN do not encompass
1078 the whole line, indicate that with a special character at the
1079 right edge of the screen. If LMARGIN is 0, we need to take the
1080 wrap offset into account. */
1081 t = lmargin + M_OFFSET (lmargin, wrap_offset) + _rl_screenwidth;
1082 if (t < out)
1083 line[t - 1] = '>';
1084
1085 if (!rl_display_fixed || forced_display || lmargin != last_lmargin)
1086 {
1087 forced_display = 0;
1088 update_line (&visible_line[last_lmargin],
1089 &invisible_line[lmargin],
1090 0,
1091 _rl_screenwidth + visible_wrap_offset,
1092 _rl_screenwidth + (lmargin ? 0 : wrap_offset),
1093 0);
1094
1095 /* If the visible new line is shorter than the old, but the number
1096 of invisible characters is greater, and we are at the end of
1097 the new line, we need to clear to eol. */
1098 t = _rl_last_c_pos - M_OFFSET (lmargin, wrap_offset);
1099 if ((M_OFFSET (lmargin, wrap_offset) > visible_wrap_offset) &&
1100 (_rl_last_c_pos == out) &&
1101 t < visible_first_line_len)
1102 {
1103 nleft = _rl_screenwidth - t;
1104 _rl_clear_to_eol (nleft);
1105 }
1106 visible_first_line_len = out - lmargin - M_OFFSET (lmargin, wrap_offset);
1107 if (visible_first_line_len > _rl_screenwidth)
1108 visible_first_line_len = _rl_screenwidth;
1109
1110 _rl_move_cursor_relative (c_pos - lmargin, &invisible_line[lmargin]);
1111 last_lmargin = lmargin;
1112 }
1113 }
1114 fflush (rl_outstream);
1115
1116 /* Swap visible and non-visible lines. */
1117 {
1118 char *vtemp = visible_line;
1119 int *itemp = vis_lbreaks, ntemp = vis_lbsize;
1120
1121 visible_line = invisible_line;
1122 invisible_line = vtemp;
1123
1124 vis_lbreaks = inv_lbreaks;
1125 inv_lbreaks = itemp;
1126
1127 vis_lbsize = inv_lbsize;
1128 inv_lbsize = ntemp;
1129
1130 rl_display_fixed = 0;
1131 /* If we are displaying on a single line, and last_lmargin is > 0, we
1132 are not displaying any invisible characters, so set visible_wrap_offset
1133 to 0. */
1134 if (_rl_horizontal_scroll_mode && last_lmargin)
1135 visible_wrap_offset = 0;
1136 else
1137 visible_wrap_offset = wrap_offset;
1138 }
1139}
1140
1141/* PWP: update_line() is based on finding the middle difference of each
1142 line on the screen; vis:
1143
1144 /old first difference
1145 /beginning of line | /old last same /old EOL
1146 v v v v
1147old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as
1148new: eddie> Oh, my little buggy says to me, as lurgid as
1149 ^ ^ ^ ^
1150 \beginning of line | \new last same \new end of line
1151 \new first difference
1152
1153 All are character pointers for the sake of speed. Special cases for
1154 no differences, as well as for end of line additions must be handled.
1155
1156 Could be made even smarter, but this works well enough */
1157static void
1158update_line (old, new, current_line, omax, nmax, inv_botlin)
1159 register char *old, *new;
1160 int current_line, omax, nmax, inv_botlin;
1161{
1162 register char *ofd, *ols, *oe, *nfd, *nls, *ne;
1163 int temp, lendiff, wsatend, od, nd;
1164 int current_invis_chars;
1165 int col_lendiff, col_temp;
1166#if defined (HANDLE_MULTIBYTE)
1167 mbstate_t ps_new, ps_old;
1168 int new_offset, old_offset, tmp;
1169#endif
1170
1171 /* If we're at the right edge of a terminal that supports xn, we're
1172 ready to wrap around, so do so. This fixes problems with knowing
1173 the exact cursor position and cut-and-paste with certain terminal
1174 emulators. In this calculation, TEMP is the physical screen
1175 position of the cursor. */
1176 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1177 temp = _rl_last_c_pos;
1178 else
1179 temp = _rl_last_c_pos - W_OFFSET(_rl_last_v_pos, visible_wrap_offset);
1180 if (temp == _rl_screenwidth && _rl_term_autowrap && !_rl_horizontal_scroll_mode
1181 && _rl_last_v_pos == current_line - 1)
1182 {
1183#if defined (HANDLE_MULTIBYTE)
1184 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1185 {
1186 wchar_t wc;
1187 mbstate_t ps;
1188 int tempwidth, bytes;
1189 size_t ret;
1190
1191 /* This fixes only double-column characters, but if the wrapped
1192 character comsumes more than three columns, spaces will be
1193 inserted in the string buffer. */
1194 if (_rl_wrapped_line[current_line] > 0)
1195 _rl_clear_to_eol (_rl_wrapped_line[current_line]);
1196
1197 memset (&ps, 0, sizeof (mbstate_t));
1198 ret = mbrtowc (&wc, new, MB_CUR_MAX, &ps);
1199 if (MB_INVALIDCH (ret))
1200 {
1201 tempwidth = 1;
1202 ret = 1;
1203 }
1204 else if (MB_NULLWCH (ret))
1205 tempwidth = 0;
1206 else
1207 tempwidth = wcwidth (wc);
1208
1209 if (tempwidth > 0)
1210 {
1211 int count;
1212 bytes = ret;
1213 for (count = 0; count < bytes; count++)
1214 putc (new[count], rl_outstream);
1215 _rl_last_c_pos = tempwidth;
1216 _rl_last_v_pos++;
1217 memset (&ps, 0, sizeof (mbstate_t));
1218 ret = mbrtowc (&wc, old, MB_CUR_MAX, &ps);
1219 if (ret != 0 && bytes != 0)
1220 {
1221 if (MB_INVALIDCH (ret))
1222 memmove (old+bytes, old+1, strlen (old+1));
1223 else
1224 memmove (old+bytes, old+ret, strlen (old+ret));
1225 memcpy (old, new, bytes);
1226 }
1227 }
1228 else
1229 {
1230 putc (' ', rl_outstream);
1231 _rl_last_c_pos = 1;
1232 _rl_last_v_pos++;
1233 if (old[0] && new[0])
1234 old[0] = new[0];
1235 }
1236 }
1237 else
1238#endif
1239 {
1240 if (new[0])
1241 putc (new[0], rl_outstream);
1242 else
1243 putc (' ', rl_outstream);
1244 _rl_last_c_pos = 1;
1245 _rl_last_v_pos++;
1246 if (old[0] && new[0])
1247 old[0] = new[0];
1248 }
1249 }
1250
1251
1252 /* Find first difference. */
1253#if defined (HANDLE_MULTIBYTE)
1254 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1255 {
1256 /* See if the old line is a subset of the new line, so that the
1257 only change is adding characters. */
1258 temp = (omax < nmax) ? omax : nmax;
1259 if (memcmp (old, new, temp) == 0)
1260 {
1261 ofd = old + temp;
1262 nfd = new + temp;
1263 }
1264 else
1265 {
1266 memset (&ps_new, 0, sizeof(mbstate_t));
1267 memset (&ps_old, 0, sizeof(mbstate_t));
1268
1269 if (omax == nmax && STREQN (new, old, omax))
1270 {
1271 ofd = old + omax;
1272 nfd = new + nmax;
1273 }
1274 else
1275 {
1276 new_offset = old_offset = 0;
1277 for (ofd = old, nfd = new;
1278 (ofd - old < omax) && *ofd &&
1279 _rl_compare_chars(old, old_offset, &ps_old, new, new_offset, &ps_new); )
1280 {
1281 old_offset = _rl_find_next_mbchar (old, old_offset, 1, MB_FIND_ANY);
1282 new_offset = _rl_find_next_mbchar (new, new_offset, 1, MB_FIND_ANY);
1283 ofd = old + old_offset;
1284 nfd = new + new_offset;
1285 }
1286 }
1287 }
1288 }
1289 else
1290#endif
1291 for (ofd = old, nfd = new;
1292 (ofd - old < omax) && *ofd && (*ofd == *nfd);
1293 ofd++, nfd++)
1294 ;
1295
1296 /* Move to the end of the screen line. ND and OD are used to keep track
1297 of the distance between ne and new and oe and old, respectively, to
1298 move a subtraction out of each loop. */
1299 for (od = ofd - old, oe = ofd; od < omax && *oe; oe++, od++);
1300 for (nd = nfd - new, ne = nfd; nd < nmax && *ne; ne++, nd++);
1301
1302 /* If no difference, continue to next line. */
1303 if (ofd == oe && nfd == ne)
1304 return;
1305
1306 wsatend = 1; /* flag for trailing whitespace */
1307
1308#if defined (HANDLE_MULTIBYTE)
1309 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1310 {
1311 ols = old + _rl_find_prev_mbchar (old, oe - old, MB_FIND_ANY);
1312 nls = new + _rl_find_prev_mbchar (new, ne - new, MB_FIND_ANY);
1313 while ((ols > ofd) && (nls > nfd))
1314 {
1315 memset (&ps_old, 0, sizeof (mbstate_t));
1316 memset (&ps_new, 0, sizeof (mbstate_t));
1317
1318#if 0
1319 /* On advice from jir@yamato.ibm.com */
1320 _rl_adjust_point (old, ols - old, &ps_old);
1321 _rl_adjust_point (new, nls - new, &ps_new);
1322#endif
1323
1324 if (_rl_compare_chars (old, ols - old, &ps_old, new, nls - new, &ps_new) == 0)
1325 break;
1326
1327 if (*ols == ' ')
1328 wsatend = 0;
1329
1330 ols = old + _rl_find_prev_mbchar (old, ols - old, MB_FIND_ANY);
1331 nls = new + _rl_find_prev_mbchar (new, nls - new, MB_FIND_ANY);
1332 }
1333 }
1334 else
1335 {
1336#endif /* HANDLE_MULTIBYTE */
1337 ols = oe - 1; /* find last same */
1338 nls = ne - 1;
1339 while ((ols > ofd) && (nls > nfd) && (*ols == *nls))
1340 {
1341 if (*ols != ' ')
1342 wsatend = 0;
1343 ols--;
1344 nls--;
1345 }
1346#if defined (HANDLE_MULTIBYTE)
1347 }
1348#endif
1349
1350 if (wsatend)
1351 {
1352 ols = oe;
1353 nls = ne;
1354 }
1355#if defined (HANDLE_MULTIBYTE)
1356 /* This may not work for stateful encoding, but who cares? To handle
1357 stateful encoding properly, we have to scan each string from the
1358 beginning and compare. */
1359 else if (_rl_compare_chars (ols, 0, NULL, nls, 0, NULL) == 0)
1360#else
1361 else if (*ols != *nls)
1362#endif
1363 {
1364 if (*ols) /* don't step past the NUL */
1365 {
1366 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1367 ols = old + _rl_find_next_mbchar (old, ols - old, 1, MB_FIND_ANY);
1368 else
1369 ols++;
1370 }
1371 if (*nls)
1372 {
1373 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1374 nls = new + _rl_find_next_mbchar (new, nls - new, 1, MB_FIND_ANY);
1375 else
1376 nls++;
1377 }
1378 }
1379
1380 /* count of invisible characters in the current invisible line. */
1381 current_invis_chars = W_OFFSET (current_line, wrap_offset);
1382 if (_rl_last_v_pos != current_line)
1383 {
1384 _rl_move_vert (current_line);
1385 if ((MB_CUR_MAX == 1 || rl_byte_oriented) && current_line == 0 && visible_wrap_offset)
1386 _rl_last_c_pos += visible_wrap_offset;
1387 }
1388
1389 /* If this is the first line and there are invisible characters in the
1390 prompt string, and the prompt string has not changed, and the current
1391 cursor position is before the last invisible character in the prompt,
1392 and the index of the character to move to is past the end of the prompt
1393 string, then redraw the entire prompt string. We can only do this
1394 reliably if the terminal supports a `cr' capability.
1395
1396 This is not an efficiency hack -- there is a problem with redrawing
1397 portions of the prompt string if they contain terminal escape
1398 sequences (like drawing the `unbold' sequence without a corresponding
1399 `bold') that manifests itself on certain terminals. */
1400
1401 lendiff = local_prompt ? strlen (local_prompt) : 0;
1402 od = ofd - old; /* index of first difference in visible line */
1403 if (current_line == 0 && !_rl_horizontal_scroll_mode &&
1404 _rl_term_cr && lendiff > prompt_visible_length && _rl_last_c_pos > 0 &&
1405 od >= lendiff && _rl_last_c_pos <= prompt_last_invisible)
1406 {
1407#if defined (__MSDOS__)
1408 putc ('\r', rl_outstream);
1409#else
1410 tputs (_rl_term_cr, 1, _rl_output_character_function);
1411#endif
1412 _rl_output_some_chars (local_prompt, lendiff);
1413 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1414 {
1415 /* We take wrap_offset into account here so we can pass correct
1416 information to _rl_move_cursor_relative. */
1417 _rl_last_c_pos = _rl_col_width (local_prompt, 0, lendiff) - wrap_offset;
1418 cpos_adjusted = 1;
1419 }
1420 else
1421 _rl_last_c_pos = lendiff;
1422 }
1423
1424 _rl_move_cursor_relative (od, old);
1425
1426 /* if (len (new) > len (old))
1427 lendiff == difference in buffer
1428 col_lendiff == difference on screen
1429 When not using multibyte characters, these are equal */
1430 lendiff = (nls - nfd) - (ols - ofd);
1431 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1432 col_lendiff = _rl_col_width (new, nfd - new, nls - new) - _rl_col_width (old, ofd - old, ols - old);
1433 else
1434 col_lendiff = lendiff;
1435
1436 /* If we are changing the number of invisible characters in a line, and
1437 the spot of first difference is before the end of the invisible chars,
1438 lendiff needs to be adjusted. */
1439 if (current_line == 0 && !_rl_horizontal_scroll_mode &&
1440 current_invis_chars != visible_wrap_offset)
1441 {
1442 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1443 {
1444 lendiff += visible_wrap_offset - current_invis_chars;
1445 col_lendiff += visible_wrap_offset - current_invis_chars;
1446 }
1447 else
1448 {
1449 lendiff += visible_wrap_offset - current_invis_chars;
1450 col_lendiff = lendiff;
1451 }
1452 }
1453
1454 /* Insert (diff (len (old), len (new)) ch. */
1455 temp = ne - nfd;
1456 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1457 col_temp = _rl_col_width (new, nfd - new, ne - new);
1458 else
1459 col_temp = temp;
1460
1461 if (col_lendiff > 0) /* XXX - was lendiff */
1462 {
1463 /* Non-zero if we're increasing the number of lines. */
1464 int gl = current_line >= _rl_vis_botlin && inv_botlin > _rl_vis_botlin;
1465 /* Sometimes it is cheaper to print the characters rather than
1466 use the terminal's capabilities. If we're growing the number
1467 of lines, make sure we actually cause the new line to wrap
1468 around on auto-wrapping terminals. */
1469 if (_rl_terminal_can_insert && ((2 * col_temp) >= col_lendiff || _rl_term_IC) && (!_rl_term_autowrap || !gl))
1470 {
1471 /* If lendiff > prompt_visible_length and _rl_last_c_pos == 0 and
1472 _rl_horizontal_scroll_mode == 1, inserting the characters with
1473 _rl_term_IC or _rl_term_ic will screw up the screen because of the
1474 invisible characters. We need to just draw them. */
1475 if (*ols && (!_rl_horizontal_scroll_mode || _rl_last_c_pos > 0 ||
1476 lendiff <= prompt_visible_length || !current_invis_chars))
1477 {
1478 insert_some_chars (nfd, lendiff, col_lendiff);
1479 _rl_last_c_pos += col_lendiff;
1480 }
1481 else if ((MB_CUR_MAX == 1 || rl_byte_oriented != 0) && *ols == 0 && lendiff > 0)
1482 {
1483 /* At the end of a line the characters do not have to
1484 be "inserted". They can just be placed on the screen. */
1485 /* However, this screws up the rest of this block, which
1486 assumes you've done the insert because you can. */
1487 _rl_output_some_chars (nfd, lendiff);
1488 _rl_last_c_pos += col_lendiff;
1489 }
1490 else
1491 {
1492 /* We have horizontal scrolling and we are not inserting at
1493 the end. We have invisible characters in this line. This
1494 is a dumb update. */
1495 _rl_output_some_chars (nfd, temp);
1496 _rl_last_c_pos += col_temp;
1497 return;
1498 }
1499 /* Copy (new) chars to screen from first diff to last match. */
1500 temp = nls - nfd;
1501 if ((temp - lendiff) > 0)
1502 {
1503 _rl_output_some_chars (nfd + lendiff, temp - lendiff);
1504#if 1
1505 /* XXX -- this bears closer inspection. Fixes a redisplay bug
1506 reported against bash-3.0-alpha by Andreas Schwab involving
1507 multibyte characters and prompt strings with invisible
1508 characters, but was previously disabled. */
1509 _rl_last_c_pos += _rl_col_width (nfd+lendiff, 0, temp-col_lendiff);
1510#else
1511 _rl_last_c_pos += _rl_col_width (nfd+lendiff, 0, temp-lendiff);
1512#endif
1513 }
1514 }
1515 else
1516 {
1517 /* cannot insert chars, write to EOL */
1518 _rl_output_some_chars (nfd, temp);
1519 _rl_last_c_pos += col_temp;
1520 /* If we're in a multibyte locale and were before the last invisible
1521 char in the current line (which implies we just output some invisible
1522 characters) we need to adjust _rl_last_c_pos, since it represents
1523 a physical character position. */
1524 }
1525 }
1526 else /* Delete characters from line. */
1527 {
1528 /* If possible and inexpensive to use terminal deletion, then do so. */
1529 if (_rl_term_dc && (2 * col_temp) >= -col_lendiff)
1530 {
1531 /* If all we're doing is erasing the invisible characters in the
1532 prompt string, don't bother. It screws up the assumptions
1533 about what's on the screen. */
1534 if (_rl_horizontal_scroll_mode && _rl_last_c_pos == 0 &&
1535 -lendiff == visible_wrap_offset)
1536 col_lendiff = 0;
1537
1538 if (col_lendiff)
1539 delete_chars (-col_lendiff); /* delete (diff) characters */
1540
1541 /* Copy (new) chars to screen from first diff to last match */
1542 temp = nls - nfd;
1543 if (temp > 0)
1544 {
1545 _rl_output_some_chars (nfd, temp);
1546 _rl_last_c_pos += _rl_col_width (nfd, 0, temp);;
1547 }
1548 }
1549 /* Otherwise, print over the existing material. */
1550 else
1551 {
1552 if (temp > 0)
1553 {
1554 _rl_output_some_chars (nfd, temp);
1555 _rl_last_c_pos += col_temp; /* XXX */
1556 }
1557 lendiff = (oe - old) - (ne - new);
1558 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1559 col_lendiff = _rl_col_width (old, 0, oe - old) - _rl_col_width (new, 0, ne - new);
1560 else
1561 col_lendiff = lendiff;
1562
1563 if (col_lendiff)
1564 {
1565 if (_rl_term_autowrap && current_line < inv_botlin)
1566 space_to_eol (col_lendiff);
1567 else
1568 _rl_clear_to_eol (col_lendiff);
1569 }
1570 }
1571 }
1572}
1573
1574/* Tell the update routines that we have moved onto a new (empty) line. */
1575int
1576rl_on_new_line ()
1577{
1578 if (visible_line)
1579 visible_line[0] = '\0';
1580
1581 _rl_last_c_pos = _rl_last_v_pos = 0;
1582 _rl_vis_botlin = last_lmargin = 0;
1583 if (vis_lbreaks)
1584 vis_lbreaks[0] = vis_lbreaks[1] = 0;
1585 visible_wrap_offset = 0;
1586 return 0;
1587}
1588
1589/* Tell the update routines that we have moved onto a new line with the
1590 prompt already displayed. Code originally from the version of readline
1591 distributed with CLISP. rl_expand_prompt must have already been called
1592 (explicitly or implicitly). This still doesn't work exactly right. */
1593int
1594rl_on_new_line_with_prompt ()
1595{
1596 int prompt_size, i, l, real_screenwidth, newlines;
1597 char *prompt_last_line, *lprompt;
1598
1599 /* Initialize visible_line and invisible_line to ensure that they can hold
1600 the already-displayed prompt. */
1601 prompt_size = strlen (rl_prompt) + 1;
1602 init_line_structures (prompt_size);
1603
1604 /* Make sure the line structures hold the already-displayed prompt for
1605 redisplay. */
1606 lprompt = local_prompt ? local_prompt : rl_prompt;
1607 strcpy (visible_line, lprompt);
1608 strcpy (invisible_line, lprompt);
1609
1610 /* If the prompt contains newlines, take the last tail. */
1611 prompt_last_line = strrchr (rl_prompt, '\n');
1612 if (!prompt_last_line)
1613 prompt_last_line = rl_prompt;
1614
1615 l = strlen (prompt_last_line);
1616 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1617 _rl_last_c_pos = _rl_col_width (prompt_last_line, 0, l); /* XXX */
1618 else
1619 _rl_last_c_pos = l;
1620
1621 /* Dissect prompt_last_line into screen lines. Note that here we have
1622 to use the real screenwidth. Readline's notion of screenwidth might be
1623 one less, see terminal.c. */
1624 real_screenwidth = _rl_screenwidth + (_rl_term_autowrap ? 0 : 1);
1625 _rl_last_v_pos = l / real_screenwidth;
1626 /* If the prompt length is a multiple of real_screenwidth, we don't know
1627 whether the cursor is at the end of the last line, or already at the
1628 beginning of the next line. Output a newline just to be safe. */
1629 if (l > 0 && (l % real_screenwidth) == 0)
1630 _rl_output_some_chars ("\n", 1);
1631 last_lmargin = 0;
1632
1633 newlines = 0; i = 0;
1634 while (i <= l)
1635 {
1636 _rl_vis_botlin = newlines;
1637 vis_lbreaks[newlines++] = i;
1638 i += real_screenwidth;
1639 }
1640 vis_lbreaks[newlines] = l;
1641 visible_wrap_offset = 0;
1642
1643 rl_display_prompt = rl_prompt; /* XXX - make sure it's set */
1644
1645 return 0;
1646}
1647
1648/* Actually update the display, period. */
1649int
1650rl_forced_update_display ()
1651{
1652 if (visible_line)
1653 {
1654 register char *temp = visible_line;
1655
1656 while (*temp)
1657 *temp++ = '\0';
1658 }
1659 rl_on_new_line ();
1660 forced_display++;
1661 (*rl_redisplay_function) ();
1662 return 0;
1663}
1664
1665/* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices.
1666 (Well, when we don't have multibyte characters, _rl_last_c_pos is a
1667 buffer index.)
1668 DATA is the contents of the screen line of interest; i.e., where
1669 the movement is being done. */
1670void
1671_rl_move_cursor_relative (new, data)
1672 int new;
1673 const char *data;
1674{
1675 register int i;
1676 int woff; /* number of invisible chars on current line */
1677 int cpos, dpos; /* current and desired cursor positions */
1678
1679 woff = W_OFFSET (_rl_last_v_pos, wrap_offset);
1680 cpos = _rl_last_c_pos;
1681#if defined (HANDLE_MULTIBYTE)
1682 /* If we have multibyte characters, NEW is indexed by the buffer point in
1683 a multibyte string, but _rl_last_c_pos is the display position. In
1684 this case, NEW's display position is not obvious and must be
1685 calculated. We need to account for invisible characters in this line,
1686 as long as we are past them and they are counted by _rl_col_width. */
1687 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1688 {
1689 dpos = _rl_col_width (data, 0, new);
1690 if (dpos > woff)
1691 dpos -= woff;
1692 }
1693 else
1694#endif
1695 dpos = new;
1696
1697 /* If we don't have to do anything, then return. */
1698 if (cpos == dpos)
1699 return;
1700
1701 /* It may be faster to output a CR, and then move forwards instead
1702 of moving backwards. */
1703 /* i == current physical cursor position. */
1704#if defined (HANDLE_MULTIBYTE)
1705 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1706 i = _rl_last_c_pos;
1707 else
1708#endif
1709 i = _rl_last_c_pos - woff;
1710 if (new == 0 || CR_FASTER (new, _rl_last_c_pos) ||
1711 (_rl_term_autowrap && i == _rl_screenwidth))
1712 {
1713#if defined (__MSDOS__)
1714 putc ('\r', rl_outstream);
1715#else
1716 tputs (_rl_term_cr, 1, _rl_output_character_function);
1717#endif /* !__MSDOS__ */
1718 cpos = _rl_last_c_pos = 0;
1719 }
1720
1721 if (cpos < dpos)
1722 {
1723 /* Move the cursor forward. We do it by printing the command
1724 to move the cursor forward if there is one, else print that
1725 portion of the output buffer again. Which is cheaper? */
1726
1727 /* The above comment is left here for posterity. It is faster
1728 to print one character (non-control) than to print a control
1729 sequence telling the terminal to move forward one character.
1730 That kind of control is for people who don't know what the
1731 data is underneath the cursor. */
1732#if defined (HACK_TERMCAP_MOTION)
1733 if (_rl_term_forward_char)
1734 {
1735 for (i = cpos; i < dpos; i++)
1736 tputs (_rl_term_forward_char, 1, _rl_output_character_function);
1737 }
1738 else
1739#endif /* HACK_TERMCAP_MOTION */
1740 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1741 {
1742 tputs (_rl_term_cr, 1, _rl_output_character_function);
1743 for (i = 0; i < new; i++)
1744 putc (data[i], rl_outstream);
1745 }
1746 else
1747 for (i = cpos; i < new; i++)
1748 putc (data[i], rl_outstream);
1749 }
1750
1751#if defined (HANDLE_MULTIBYTE)
1752 /* NEW points to the buffer point, but _rl_last_c_pos is the display point.
1753 The byte length of the string is probably bigger than the column width
1754 of the string, which means that if NEW == _rl_last_c_pos, then NEW's
1755 display point is less than _rl_last_c_pos. */
1756#endif
1757 else if (cpos > dpos)
1758 _rl_backspace (cpos - dpos);
1759
1760 _rl_last_c_pos = dpos;
1761}
1762
1763/* PWP: move the cursor up or down. */
1764void
1765_rl_move_vert (to)
1766 int to;
1767{
1768 register int delta, i;
1769
1770 if (_rl_last_v_pos == to || to > _rl_screenheight)
1771 return;
1772
1773 if ((delta = to - _rl_last_v_pos) > 0)
1774 {
1775 for (i = 0; i < delta; i++)
1776 putc ('\n', rl_outstream);
1777#if defined (__MSDOS__)
1778 putc ('\r', rl_outstream);
1779#else
1780 tputs (_rl_term_cr, 1, _rl_output_character_function);
1781#endif
1782 _rl_last_c_pos = 0;
1783 }
1784 else
1785 { /* delta < 0 */
1786 if (_rl_term_up && *_rl_term_up)
1787 for (i = 0; i < -delta; i++)
1788 tputs (_rl_term_up, 1, _rl_output_character_function);
1789 }
1790
1791 _rl_last_v_pos = to; /* Now TO is here */
1792}
1793
1794/* Physically print C on rl_outstream. This is for functions which know
1795 how to optimize the display. Return the number of characters output. */
1796int
1797rl_show_char (c)
1798 int c;
1799{
1800 int n = 1;
1801 if (META_CHAR (c) && (_rl_output_meta_chars == 0))
1802 {
1803 fprintf (rl_outstream, "M-");
1804 n += 2;
1805 c = UNMETA (c);
1806 }
1807
1808#if defined (DISPLAY_TABS)
1809 if ((CTRL_CHAR (c) && c != '\t') || c == RUBOUT)
1810#else
1811 if (CTRL_CHAR (c) || c == RUBOUT)
1812#endif /* !DISPLAY_TABS */
1813 {
1814 fprintf (rl_outstream, "C-");
1815 n += 2;
1816 c = CTRL_CHAR (c) ? UNCTRL (c) : '?';
1817 }
1818
1819 putc (c, rl_outstream);
1820 fflush (rl_outstream);
1821 return n;
1822}
1823
1824int
1825rl_character_len (c, pos)
1826 register int c, pos;
1827{
1828 unsigned char uc;
1829
1830 uc = (unsigned char)c;
1831
1832 if (META_CHAR (uc))
1833 return ((_rl_output_meta_chars == 0) ? 4 : 1);
1834
1835 if (uc == '\t')
1836 {
1837#if defined (DISPLAY_TABS)
1838 return (((pos | 7) + 1) - pos);
1839#else
1840 return (2);
1841#endif /* !DISPLAY_TABS */
1842 }
1843
1844 if (CTRL_CHAR (c) || c == RUBOUT)
1845 return (2);
1846
1847 return ((ISPRINT (uc)) ? 1 : 2);
1848}
1849/* How to print things in the "echo-area". The prompt is treated as a
1850 mini-modeline. */
1851static int msg_saved_prompt = 0;
1852
1853#if defined (USE_VARARGS)
1854int
1855#if defined (PREFER_STDARG)
1856rl_message (const char *format, ...)
1857#else
1858rl_message (va_alist)
1859 va_dcl
1860#endif
1861{
1862 va_list args;
1863#if defined (PREFER_VARARGS)
1864 char *format;
1865#endif
1866
1867#if defined (PREFER_STDARG)
1868 va_start (args, format);
1869#else
1870 va_start (args);
1871 format = va_arg (args, char *);
1872#endif
1873
1874#if defined (HAVE_VSNPRINTF)
1875 vsnprintf (msg_buf, sizeof (msg_buf) - 1, format, args);
1876#else
1877 vsprintf (msg_buf, format, args);
1878 msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */
1879#endif
1880 va_end (args);
1881
1882 if (saved_local_prompt == 0)
1883 {
1884 rl_save_prompt ();
1885 msg_saved_prompt = 1;
1886 }
1887 rl_display_prompt = msg_buf;
1888 local_prompt = expand_prompt (msg_buf, &prompt_visible_length,
1889 &prompt_last_invisible,
1890 &prompt_invis_chars_first_line,
1891 &prompt_physical_chars);
1892 local_prompt_prefix = (char *)NULL;
1893 (*rl_redisplay_function) ();
1894
1895 return 0;
1896}
1897#else /* !USE_VARARGS */
1898int
1899rl_message (format, arg1, arg2)
1900 char *format;
1901{
1902 sprintf (msg_buf, format, arg1, arg2);
1903 msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */
1904
1905 rl_display_prompt = msg_buf;
1906 if (saved_local_prompt == 0)
1907 {
1908 rl_save_prompt ();
1909 msg_saved_prompt = 1;
1910 }
1911 local_prompt = expand_prompt (msg_buf, &prompt_visible_length,
1912 &prompt_last_invisible,
1913 &prompt_invis_chars_first_line,
1914 &prompt_physical_chars);
1915 local_prompt_prefix = (char *)NULL;
1916 (*rl_redisplay_function) ();
1917
1918 return 0;
1919}
1920#endif /* !USE_VARARGS */
1921
1922/* How to clear things from the "echo-area". */
1923int
1924rl_clear_message ()
1925{
1926 rl_display_prompt = rl_prompt;
1927 if (msg_saved_prompt)
1928 {
1929 rl_restore_prompt ();
1930 msg_saved_prompt = 0;
1931 }
1932 (*rl_redisplay_function) ();
1933 return 0;
1934}
1935
1936int
1937rl_reset_line_state ()
1938{
1939 rl_on_new_line ();
1940
1941 rl_display_prompt = rl_prompt ? rl_prompt : "";
1942 forced_display = 1;
1943 return 0;
1944}
1945
1946void
1947rl_save_prompt ()
1948{
1949 saved_local_prompt = local_prompt;
1950 saved_local_prefix = local_prompt_prefix;
1951 saved_prefix_length = prompt_prefix_length;
1952 saved_last_invisible = prompt_last_invisible;
1953 saved_visible_length = prompt_visible_length;
1954 saved_invis_chars_first_line = prompt_invis_chars_first_line;
1955 saved_physical_chars = prompt_physical_chars;
1956
1957 local_prompt = local_prompt_prefix = (char *)0;
1958 prompt_last_invisible = prompt_visible_length = prompt_prefix_length = 0;
1959 prompt_invis_chars_first_line = prompt_physical_chars = 0;
1960}
1961
1962void
1963rl_restore_prompt ()
1964{
1965 FREE (local_prompt);
1966 FREE (local_prompt_prefix);
1967
1968 local_prompt = saved_local_prompt;
1969 local_prompt_prefix = saved_local_prefix;
1970 prompt_prefix_length = saved_prefix_length;
1971 prompt_last_invisible = saved_last_invisible;
1972 prompt_visible_length = saved_visible_length;
1973 prompt_invis_chars_first_line = saved_invis_chars_first_line;
1974 prompt_physical_chars = saved_physical_chars;
1975
1976 /* can test saved_local_prompt to see if prompt info has been saved. */
1977 saved_local_prompt = saved_local_prefix = (char *)0;
1978 saved_last_invisible = saved_visible_length = saved_prefix_length = 0;
1979 saved_invis_chars_first_line = saved_physical_chars = 0;
1980}
1981
1982char *
1983_rl_make_prompt_for_search (pchar)
1984 int pchar;
1985{
1986 int len;
| 2/* display.c -- readline redisplay facility. */
3
4/* Copyright (C) 1987-2005 Free Software Foundation, Inc.
5
6 This file is part of the GNU Readline Library, a library for
7 reading lines of text with interactive input and history editing.
8
9 The GNU Readline Library is free software; you can redistribute it
10 and/or modify it under the terms of the GNU General Public License
11 as published by the Free Software Foundation; either version 2, or
12 (at your option) any later version.
13
14 The GNU Readline Library is distributed in the hope that it will be
15 useful, but WITHOUT ANY WARRANTY; without even the implied warranty
16 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 The GNU General Public License is often shipped with GNU software, and
20 is generally kept in a file called COPYING or LICENSE. If you do not
21 have a copy of the license, write to the Free Software Foundation,
22 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
23#define READLINE_LIBRARY
24
25#if defined (HAVE_CONFIG_H)
26# include <config.h>
27#endif
28
29#include <sys/types.h>
30
31#if defined (HAVE_UNISTD_H)
32# include <unistd.h>
33#endif /* HAVE_UNISTD_H */
34
35#include "posixstat.h"
36
37#if defined (HAVE_STDLIB_H)
38# include <stdlib.h>
39#else
40# include "ansi_stdlib.h"
41#endif /* HAVE_STDLIB_H */
42
43#include <stdio.h>
44
45/* System-specific feature definitions and include files. */
46#include "rldefs.h"
47#include "rlmbutil.h"
48
49/* Termcap library stuff. */
50#include "tcap.h"
51
52/* Some standard library routines. */
53#include "readline.h"
54#include "history.h"
55
56#include "rlprivate.h"
57#include "xmalloc.h"
58
59#if !defined (strchr) && !defined (__STDC__)
60extern char *strchr (), *strrchr ();
61#endif /* !strchr && !__STDC__ */
62
63#if defined (HACK_TERMCAP_MOTION)
64extern char *_rl_term_forward_char;
65#endif
66
67static void update_line PARAMS((char *, char *, int, int, int, int));
68static void space_to_eol PARAMS((int));
69static void delete_chars PARAMS((int));
70static void insert_some_chars PARAMS((char *, int, int));
71static void cr PARAMS((void));
72
73#if defined (HANDLE_MULTIBYTE)
74static int _rl_col_width PARAMS((const char *, int, int));
75static int *_rl_wrapped_line;
76#else
77# define _rl_col_width(l, s, e) (((e) <= (s)) ? 0 : (e) - (s))
78#endif
79
80static int *inv_lbreaks, *vis_lbreaks;
81static int inv_lbsize, vis_lbsize;
82
83/* Heuristic used to decide whether it is faster to move from CUR to NEW
84 by backing up or outputting a carriage return and moving forward. */
85#define CR_FASTER(new, cur) (((new) + 1) < ((cur) - (new)))
86
87/* **************************************************************** */
88/* */
89/* Display stuff */
90/* */
91/* **************************************************************** */
92
93/* This is the stuff that is hard for me. I never seem to write good
94 display routines in C. Let's see how I do this time. */
95
96/* (PWP) Well... Good for a simple line updater, but totally ignores
97 the problems of input lines longer than the screen width.
98
99 update_line and the code that calls it makes a multiple line,
100 automatically wrapping line update. Careful attention needs
101 to be paid to the vertical position variables. */
102
103/* Keep two buffers; one which reflects the current contents of the
104 screen, and the other to draw what we think the new contents should
105 be. Then compare the buffers, and make whatever changes to the
106 screen itself that we should. Finally, make the buffer that we
107 just drew into be the one which reflects the current contents of the
108 screen, and place the cursor where it belongs.
109
110 Commands that want to can fix the display themselves, and then let
111 this function know that the display has been fixed by setting the
112 RL_DISPLAY_FIXED variable. This is good for efficiency. */
113
114/* Application-specific redisplay function. */
115rl_voidfunc_t *rl_redisplay_function = rl_redisplay;
116
117/* Global variables declared here. */
118/* What YOU turn on when you have handled all redisplay yourself. */
119int rl_display_fixed = 0;
120
121int _rl_suppress_redisplay = 0;
122int _rl_want_redisplay = 0;
123
124/* The stuff that gets printed out before the actual text of the line.
125 This is usually pointing to rl_prompt. */
126char *rl_display_prompt = (char *)NULL;
127
128/* Pseudo-global variables declared here. */
129
130/* The visible cursor position. If you print some text, adjust this. */
131/* NOTE: _rl_last_c_pos is used as a buffer index when not in a locale
132 supporting multibyte characters, and an absolute cursor position when
133 in such a locale. This is an artifact of the donated multibyte support.
134 Care must be taken when modifying its value. */
135int _rl_last_c_pos = 0;
136int _rl_last_v_pos = 0;
137
138static int cpos_adjusted;
139
140/* Number of lines currently on screen minus 1. */
141int _rl_vis_botlin = 0;
142
143/* Variables used only in this file. */
144/* The last left edge of text that was displayed. This is used when
145 doing horizontal scrolling. It shifts in thirds of a screenwidth. */
146static int last_lmargin;
147
148/* The line display buffers. One is the line currently displayed on
149 the screen. The other is the line about to be displayed. */
150static char *visible_line = (char *)NULL;
151static char *invisible_line = (char *)NULL;
152
153/* A buffer for `modeline' messages. */
154static char msg_buf[128];
155
156/* Non-zero forces the redisplay even if we thought it was unnecessary. */
157static int forced_display;
158
159/* Default and initial buffer size. Can grow. */
160static int line_size = 1024;
161
162/* Variables to keep track of the expanded prompt string, which may
163 include invisible characters. */
164
165static char *local_prompt, *local_prompt_prefix;
166static int prompt_visible_length, prompt_prefix_length;
167
168/* The number of invisible characters in the line currently being
169 displayed on the screen. */
170static int visible_wrap_offset;
171
172/* The number of invisible characters in the prompt string. Static so it
173 can be shared between rl_redisplay and update_line */
174static int wrap_offset;
175
176/* The index of the last invisible character in the prompt string. */
177static int prompt_last_invisible;
178
179/* The length (buffer offset) of the first line of the last (possibly
180 multi-line) buffer displayed on the screen. */
181static int visible_first_line_len;
182
183/* Number of invisible characters on the first physical line of the prompt.
184 Only valid when the number of physical characters in the prompt exceeds
185 (or is equal to) _rl_screenwidth. */
186static int prompt_invis_chars_first_line;
187
188static int prompt_last_screen_line;
189
190static int prompt_physical_chars;
191
192/* Variables to save and restore prompt and display information. */
193
194/* These are getting numerous enough that it's time to create a struct. */
195
196static char *saved_local_prompt;
197static char *saved_local_prefix;
198static int saved_last_invisible;
199static int saved_visible_length;
200static int saved_prefix_length;
201static int saved_invis_chars_first_line;
202static int saved_physical_chars;
203
204/* Expand the prompt string S and return the number of visible
205 characters in *LP, if LP is not null. This is currently more-or-less
206 a placeholder for expansion. LIP, if non-null is a place to store the
207 index of the last invisible character in the returned string. NIFLP,
208 if non-zero, is a place to store the number of invisible characters in
209 the first prompt line. The previous are used as byte counts -- indexes
210 into a character buffer. */
211
212/* Current implementation:
213 \001 (^A) start non-visible characters
214 \002 (^B) end non-visible characters
215 all characters except \001 and \002 (following a \001) are copied to
216 the returned string; all characters except those between \001 and
217 \002 are assumed to be `visible'. */
218
219static char *
220expand_prompt (pmt, lp, lip, niflp, vlp)
221 char *pmt;
222 int *lp, *lip, *niflp, *vlp;
223{
224 char *r, *ret, *p;
225 int l, rl, last, ignoring, ninvis, invfl, invflset, ind, pind, physchars;
226
227 /* Short-circuit if we can. */
228 if ((MB_CUR_MAX <= 1 || rl_byte_oriented) && strchr (pmt, RL_PROMPT_START_IGNORE) == 0)
229 {
230 r = savestring (pmt);
231 if (lp)
232 *lp = strlen (r);
233 if (lip)
234 *lip = 0;
235 if (niflp)
236 *niflp = 0;
237 if (vlp)
238 *vlp = lp ? *lp : strlen (r);
239 return r;
240 }
241
242 l = strlen (pmt);
243 r = ret = (char *)xmalloc (l + 1);
244
245 invfl = 0; /* invisible chars in first line of prompt */
246 invflset = 0; /* we only want to set invfl once */
247
248 for (rl = ignoring = last = ninvis = physchars = 0, p = pmt; p && *p; p++)
249 {
250 /* This code strips the invisible character string markers
251 RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */
252 if (*p == RL_PROMPT_START_IGNORE)
253 {
254 ignoring++;
255 continue;
256 }
257 else if (ignoring && *p == RL_PROMPT_END_IGNORE)
258 {
259 ignoring = 0;
260 if (p[-1] != RL_PROMPT_START_IGNORE)
261 last = r - ret - 1;
262 continue;
263 }
264 else
265 {
266#if defined (HANDLE_MULTIBYTE)
267 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
268 {
269 pind = p - pmt;
270 ind = _rl_find_next_mbchar (pmt, pind, 1, MB_FIND_NONZERO);
271 l = ind - pind;
272 while (l--)
273 *r++ = *p++;
274 if (!ignoring)
275 {
276 rl += ind - pind;
277 physchars += _rl_col_width (pmt, pind, ind);
278 }
279 else
280 ninvis += ind - pind;
281 p--; /* compensate for later increment */
282 }
283 else
284#endif
285 {
286 *r++ = *p;
287 if (!ignoring)
288 {
289 rl++; /* visible length byte counter */
290 physchars++;
291 }
292 else
293 ninvis++; /* invisible chars byte counter */
294 }
295
296 if (invflset == 0 && rl >= _rl_screenwidth)
297 {
298 invfl = ninvis;
299 invflset = 1;
300 }
301 }
302 }
303
304 if (rl < _rl_screenwidth)
305 invfl = ninvis;
306
307 *r = '\0';
308 if (lp)
309 *lp = rl;
310 if (lip)
311 *lip = last;
312 if (niflp)
313 *niflp = invfl;
314 if (vlp)
315 *vlp = physchars;
316 return ret;
317}
318
319/* Just strip out RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE from
320 PMT and return the rest of PMT. */
321char *
322_rl_strip_prompt (pmt)
323 char *pmt;
324{
325 char *ret;
326
327 ret = expand_prompt (pmt, (int *)NULL, (int *)NULL, (int *)NULL, (int *)NULL);
328 return ret;
329}
330
331/*
332 * Expand the prompt string into the various display components, if
333 * necessary.
334 *
335 * local_prompt = expanded last line of string in rl_display_prompt
336 * (portion after the final newline)
337 * local_prompt_prefix = portion before last newline of rl_display_prompt,
338 * expanded via expand_prompt
339 * prompt_visible_length = number of visible characters in local_prompt
340 * prompt_prefix_length = number of visible characters in local_prompt_prefix
341 *
342 * This function is called once per call to readline(). It may also be
343 * called arbitrarily to expand the primary prompt.
344 *
345 * The return value is the number of visible characters on the last line
346 * of the (possibly multi-line) prompt.
347 */
348int
349rl_expand_prompt (prompt)
350 char *prompt;
351{
352 char *p, *t;
353 int c;
354
355 /* Clear out any saved values. */
356 FREE (local_prompt);
357 FREE (local_prompt_prefix);
358
359 local_prompt = local_prompt_prefix = (char *)0;
360 prompt_last_invisible = prompt_invis_chars_first_line = 0;
361 prompt_visible_length = prompt_physical_chars = 0;
362
363 if (prompt == 0 || *prompt == 0)
364 return (0);
365
366 p = strrchr (prompt, '\n');
367 if (!p)
368 {
369 /* The prompt is only one logical line, though it might wrap. */
370 local_prompt = expand_prompt (prompt, &prompt_visible_length,
371 &prompt_last_invisible,
372 &prompt_invis_chars_first_line,
373 &prompt_physical_chars);
374 local_prompt_prefix = (char *)0;
375 return (prompt_visible_length);
376 }
377 else
378 {
379 /* The prompt spans multiple lines. */
380 t = ++p;
381 local_prompt = expand_prompt (p, &prompt_visible_length,
382 &prompt_last_invisible,
383 (int *)NULL,
384 &prompt_physical_chars);
385 c = *t; *t = '\0';
386 /* The portion of the prompt string up to and including the
387 final newline is now null-terminated. */
388 local_prompt_prefix = expand_prompt (prompt, &prompt_prefix_length,
389 (int *)NULL,
390 &prompt_invis_chars_first_line,
391 (int *)NULL);
392 *t = c;
393 return (prompt_prefix_length);
394 }
395}
396
397/* Initialize the VISIBLE_LINE and INVISIBLE_LINE arrays, and their associated
398 arrays of line break markers. MINSIZE is the minimum size of VISIBLE_LINE
399 and INVISIBLE_LINE; if it is greater than LINE_SIZE, LINE_SIZE is
400 increased. If the lines have already been allocated, this ensures that
401 they can hold at least MINSIZE characters. */
402static void
403init_line_structures (minsize)
404 int minsize;
405{
406 register int n;
407
408 if (invisible_line == 0) /* initialize it */
409 {
410 if (line_size < minsize)
411 line_size = minsize;
412 visible_line = (char *)xmalloc (line_size);
413 invisible_line = (char *)xmalloc (line_size);
414 }
415 else if (line_size < minsize) /* ensure it can hold MINSIZE chars */
416 {
417 line_size *= 2;
418 if (line_size < minsize)
419 line_size = minsize;
420 visible_line = (char *)xrealloc (visible_line, line_size);
421 invisible_line = (char *)xrealloc (invisible_line, line_size);
422 }
423
424 for (n = minsize; n < line_size; n++)
425 {
426 visible_line[n] = 0;
427 invisible_line[n] = 1;
428 }
429
430 if (vis_lbreaks == 0)
431 {
432 /* should be enough. */
433 inv_lbsize = vis_lbsize = 256;
434 inv_lbreaks = (int *)xmalloc (inv_lbsize * sizeof (int));
435 vis_lbreaks = (int *)xmalloc (vis_lbsize * sizeof (int));
436#if defined (HANDLE_MULTIBYTE)
437 _rl_wrapped_line = (int *)xmalloc (vis_lbsize * sizeof (int));
438#endif
439 inv_lbreaks[0] = vis_lbreaks[0] = 0;
440 }
441}
442
443/* Basic redisplay algorithm. */
444void
445rl_redisplay ()
446{
447 register int in, out, c, linenum, cursor_linenum;
448 register char *line;
449 int c_pos, inv_botlin, lb_botlin, lb_linenum, o_cpos;
450 int newlines, lpos, temp, modmark, n0, num;
451 char *prompt_this_line;
452#if defined (HANDLE_MULTIBYTE)
453 wchar_t wc;
454 size_t wc_bytes;
455 int wc_width;
456 mbstate_t ps;
457 int _rl_wrapped_multicolumn = 0;
458#endif
459
460 if (!readline_echoing_p)
461 return;
462
463 if (!rl_display_prompt)
464 rl_display_prompt = "";
465
466 if (invisible_line == 0 || vis_lbreaks == 0)
467 {
468 init_line_structures (0);
469 rl_on_new_line ();
470 }
471
472 /* Draw the line into the buffer. */
473 c_pos = -1;
474
475 line = invisible_line;
476 out = inv_botlin = 0;
477
478 /* Mark the line as modified or not. We only do this for history
479 lines. */
480 modmark = 0;
481 if (_rl_mark_modified_lines && current_history () && rl_undo_list)
482 {
483 line[out++] = '*';
484 line[out] = '\0';
485 modmark = 1;
486 }
487
488 /* If someone thought that the redisplay was handled, but the currently
489 visible line has a different modification state than the one about
490 to become visible, then correct the caller's misconception. */
491 if (visible_line[0] != invisible_line[0])
492 rl_display_fixed = 0;
493
494 /* If the prompt to be displayed is the `primary' readline prompt (the
495 one passed to readline()), use the values we have already expanded.
496 If not, use what's already in rl_display_prompt. WRAP_OFFSET is the
497 number of non-visible characters in the prompt string. */
498 if (rl_display_prompt == rl_prompt || local_prompt)
499 {
500 int local_len = local_prompt ? strlen (local_prompt) : 0;
501 if (local_prompt_prefix && forced_display)
502 _rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix));
503
504 if (local_len > 0)
505 {
506 temp = local_len + out + 2;
507 if (temp >= line_size)
508 {
509 line_size = (temp + 1024) - (temp % 1024);
510 visible_line = (char *)xrealloc (visible_line, line_size);
511 line = invisible_line = (char *)xrealloc (invisible_line, line_size);
512 }
513 strncpy (line + out, local_prompt, local_len);
514 out += local_len;
515 }
516 line[out] = '\0';
517 wrap_offset = local_len - prompt_visible_length;
518 }
519 else
520 {
521 int pmtlen;
522 prompt_this_line = strrchr (rl_display_prompt, '\n');
523 if (!prompt_this_line)
524 prompt_this_line = rl_display_prompt;
525 else
526 {
527 prompt_this_line++;
528 pmtlen = prompt_this_line - rl_display_prompt; /* temp var */
529 if (forced_display)
530 {
531 _rl_output_some_chars (rl_display_prompt, pmtlen);
532 /* Make sure we are at column zero even after a newline,
533 regardless of the state of terminal output processing. */
534 if (pmtlen < 2 || prompt_this_line[-2] != '\r')
535 cr ();
536 }
537 }
538
539 prompt_physical_chars = pmtlen = strlen (prompt_this_line);
540 temp = pmtlen + out + 2;
541 if (temp >= line_size)
542 {
543 line_size = (temp + 1024) - (temp % 1024);
544 visible_line = (char *)xrealloc (visible_line, line_size);
545 line = invisible_line = (char *)xrealloc (invisible_line, line_size);
546 }
547 strncpy (line + out, prompt_this_line, pmtlen);
548 out += pmtlen;
549 line[out] = '\0';
550 wrap_offset = prompt_invis_chars_first_line = 0;
551 }
552
553#define CHECK_INV_LBREAKS() \
554 do { \
555 if (newlines >= (inv_lbsize - 2)) \
556 { \
557 inv_lbsize *= 2; \
558 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
559 } \
560 } while (0)
561
562#if defined (HANDLE_MULTIBYTE)
563#define CHECK_LPOS() \
564 do { \
565 lpos++; \
566 if (lpos >= _rl_screenwidth) \
567 { \
568 if (newlines >= (inv_lbsize - 2)) \
569 { \
570 inv_lbsize *= 2; \
571 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
572 _rl_wrapped_line = (int *)xrealloc (_rl_wrapped_line, inv_lbsize * sizeof (int)); \
573 } \
574 inv_lbreaks[++newlines] = out; \
575 _rl_wrapped_line[newlines] = _rl_wrapped_multicolumn; \
576 lpos = 0; \
577 } \
578 } while (0)
579#else
580#define CHECK_LPOS() \
581 do { \
582 lpos++; \
583 if (lpos >= _rl_screenwidth) \
584 { \
585 if (newlines >= (inv_lbsize - 2)) \
586 { \
587 inv_lbsize *= 2; \
588 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
589 } \
590 inv_lbreaks[++newlines] = out; \
591 lpos = 0; \
592 } \
593 } while (0)
594#endif
595
596 /* inv_lbreaks[i] is where line i starts in the buffer. */
597 inv_lbreaks[newlines = 0] = 0;
598#if 0
599 lpos = out - wrap_offset;
600#else
601 lpos = prompt_physical_chars + modmark;
602#endif
603
604#if defined (HANDLE_MULTIBYTE)
605 memset (_rl_wrapped_line, 0, vis_lbsize);
606 num = 0;
607#endif
608
609 /* prompt_invis_chars_first_line is the number of invisible characters in
610 the first physical line of the prompt.
611 wrap_offset - prompt_invis_chars_first_line is the number of invis
612 chars on the second line. */
613
614 /* what if lpos is already >= _rl_screenwidth before we start drawing the
615 contents of the command line? */
616 while (lpos >= _rl_screenwidth)
617 {
618 /* fix from Darin Johnson <darin@acuson.com> for prompt string with
619 invisible characters that is longer than the screen width. The
620 prompt_invis_chars_first_line variable could be made into an array
621 saying how many invisible characters there are per line, but that's
622 probably too much work for the benefit gained. How many people have
623 prompts that exceed two physical lines?
624 Additional logic fix from Edward Catmur <ed@catmur.co.uk> */
625#if defined (HANDLE_MULTIBYTE)
626 n0 = num;
627 temp = local_prompt ? strlen (local_prompt) : 0;
628 while (num < temp)
629 {
630 if (_rl_col_width (local_prompt, n0, num) > _rl_screenwidth)
631 {
632 num = _rl_find_prev_mbchar (local_prompt, num, MB_FIND_ANY);
633 break;
634 }
635 num++;
636 }
637 temp = num +
638#else
639 temp = ((newlines + 1) * _rl_screenwidth) +
640#endif /* !HANDLE_MULTIBYTE */
641 ((local_prompt_prefix == 0) ? ((newlines == 0) ? prompt_invis_chars_first_line
642 : ((newlines == 1) ? wrap_offset : 0))
643 : ((newlines == 0) ? wrap_offset :0));
644
645 inv_lbreaks[++newlines] = temp;
646#if defined (HANDLE_MULTIBYTE)
647 lpos -= _rl_col_width (local_prompt, n0, num);
648#else
649 lpos -= _rl_screenwidth;
650#endif
651 }
652
653 prompt_last_screen_line = newlines;
654
655 /* Draw the rest of the line (after the prompt) into invisible_line, keeping
656 track of where the cursor is (c_pos), the number of the line containing
657 the cursor (lb_linenum), the last line number (lb_botlin and inv_botlin).
658 It maintains an array of line breaks for display (inv_lbreaks).
659 This handles expanding tabs for display and displaying meta characters. */
660 lb_linenum = 0;
661#if defined (HANDLE_MULTIBYTE)
662 in = 0;
663 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
664 {
665 memset (&ps, 0, sizeof (mbstate_t));
666 wc_bytes = mbrtowc (&wc, rl_line_buffer, rl_end, &ps);
667 }
668 else
669 wc_bytes = 1;
670 while (in < rl_end)
671#else
672 for (in = 0; in < rl_end; in++)
673#endif
674 {
675 c = (unsigned char)rl_line_buffer[in];
676
677#if defined (HANDLE_MULTIBYTE)
678 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
679 {
680 if (MB_INVALIDCH (wc_bytes))
681 {
682 /* Byte sequence is invalid or shortened. Assume that the
683 first byte represents a character. */
684 wc_bytes = 1;
685 /* Assume that a character occupies a single column. */
686 wc_width = 1;
687 memset (&ps, 0, sizeof (mbstate_t));
688 }
689 else if (MB_NULLWCH (wc_bytes))
690 break; /* Found '\0' */
691 else
692 {
693 temp = wcwidth (wc);
694 wc_width = (temp >= 0) ? temp : 1;
695 }
696 }
697#endif
698
699 if (out + 8 >= line_size) /* XXX - 8 for \t */
700 {
701 line_size *= 2;
702 visible_line = (char *)xrealloc (visible_line, line_size);
703 invisible_line = (char *)xrealloc (invisible_line, line_size);
704 line = invisible_line;
705 }
706
707 if (in == rl_point)
708 {
709 c_pos = out;
710 lb_linenum = newlines;
711 }
712
713#if defined (HANDLE_MULTIBYTE)
714 if (META_CHAR (c) && _rl_output_meta_chars == 0) /* XXX - clean up */
715#else
716 if (META_CHAR (c))
717#endif
718 {
719 if (_rl_output_meta_chars == 0)
720 {
721 sprintf (line + out, "\\%o", c);
722
723 if (lpos + 4 >= _rl_screenwidth)
724 {
725 temp = _rl_screenwidth - lpos;
726 CHECK_INV_LBREAKS ();
727 inv_lbreaks[++newlines] = out + temp;
728 lpos = 4 - temp;
729 }
730 else
731 lpos += 4;
732
733 out += 4;
734 }
735 else
736 {
737 line[out++] = c;
738 CHECK_LPOS();
739 }
740 }
741#if defined (DISPLAY_TABS)
742 else if (c == '\t')
743 {
744 register int newout;
745
746#if 0
747 newout = (out | (int)7) + 1;
748#else
749 newout = out + 8 - lpos % 8;
750#endif
751 temp = newout - out;
752 if (lpos + temp >= _rl_screenwidth)
753 {
754 register int temp2;
755 temp2 = _rl_screenwidth - lpos;
756 CHECK_INV_LBREAKS ();
757 inv_lbreaks[++newlines] = out + temp2;
758 lpos = temp - temp2;
759 while (out < newout)
760 line[out++] = ' ';
761 }
762 else
763 {
764 while (out < newout)
765 line[out++] = ' ';
766 lpos += temp;
767 }
768 }
769#endif
770 else if (c == '\n' && _rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up)
771 {
772 line[out++] = '\0'; /* XXX - sentinel */
773 CHECK_INV_LBREAKS ();
774 inv_lbreaks[++newlines] = out;
775 lpos = 0;
776 }
777 else if (CTRL_CHAR (c) || c == RUBOUT)
778 {
779 line[out++] = '^';
780 CHECK_LPOS();
781 line[out++] = CTRL_CHAR (c) ? UNCTRL (c) : '?';
782 CHECK_LPOS();
783 }
784 else
785 {
786#if defined (HANDLE_MULTIBYTE)
787 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
788 {
789 register int i;
790
791 _rl_wrapped_multicolumn = 0;
792
793 if (_rl_screenwidth < lpos + wc_width)
794 for (i = lpos; i < _rl_screenwidth; i++)
795 {
796 /* The space will be removed in update_line() */
797 line[out++] = ' ';
798 _rl_wrapped_multicolumn++;
799 CHECK_LPOS();
800 }
801 if (in == rl_point)
802 {
803 c_pos = out;
804 lb_linenum = newlines;
805 }
806 for (i = in; i < in+wc_bytes; i++)
807 line[out++] = rl_line_buffer[i];
808 for (i = 0; i < wc_width; i++)
809 CHECK_LPOS();
810 }
811 else
812 {
813 line[out++] = c;
814 CHECK_LPOS();
815 }
816#else
817 line[out++] = c;
818 CHECK_LPOS();
819#endif
820 }
821
822#if defined (HANDLE_MULTIBYTE)
823 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
824 {
825 in += wc_bytes;
826 wc_bytes = mbrtowc (&wc, rl_line_buffer + in, rl_end - in, &ps);
827 }
828 else
829 in++;
830#endif
831
832 }
833 line[out] = '\0';
834 if (c_pos < 0)
835 {
836 c_pos = out;
837 lb_linenum = newlines;
838 }
839
840 inv_botlin = lb_botlin = newlines;
841 CHECK_INV_LBREAKS ();
842 inv_lbreaks[newlines+1] = out;
843 cursor_linenum = lb_linenum;
844
845 /* C_POS == position in buffer where cursor should be placed.
846 CURSOR_LINENUM == line number where the cursor should be placed. */
847
848 /* PWP: now is when things get a bit hairy. The visible and invisible
849 line buffers are really multiple lines, which would wrap every
850 (screenwidth - 1) characters. Go through each in turn, finding
851 the changed region and updating it. The line order is top to bottom. */
852
853 /* If we can move the cursor up and down, then use multiple lines,
854 otherwise, let long lines display in a single terminal line, and
855 horizontally scroll it. */
856
857 if (_rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up)
858 {
859 int nleft, pos, changed_screen_line, tx;
860
861 if (!rl_display_fixed || forced_display)
862 {
863 forced_display = 0;
864
865 /* If we have more than a screenful of material to display, then
866 only display a screenful. We should display the last screen,
867 not the first. */
868 if (out >= _rl_screenchars)
869 {
870 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
871 out = _rl_find_prev_mbchar (line, _rl_screenchars, MB_FIND_ANY);
872 else
873 out = _rl_screenchars - 1;
874 }
875
876 /* The first line is at character position 0 in the buffer. The
877 second and subsequent lines start at inv_lbreaks[N], offset by
878 OFFSET (which has already been calculated above). */
879
880#define W_OFFSET(line, offset) ((line) == 0 ? offset : 0)
881#define VIS_LLEN(l) ((l) > _rl_vis_botlin ? 0 : (vis_lbreaks[l+1] - vis_lbreaks[l]))
882#define INV_LLEN(l) (inv_lbreaks[l+1] - inv_lbreaks[l])
883#define VIS_CHARS(line) (visible_line + vis_lbreaks[line])
884#define VIS_LINE(line) ((line) > _rl_vis_botlin) ? "" : VIS_CHARS(line)
885#define INV_LINE(line) (invisible_line + inv_lbreaks[line])
886
887 /* For each line in the buffer, do the updating display. */
888 for (linenum = 0; linenum <= inv_botlin; linenum++)
889 {
890 o_cpos = _rl_last_c_pos;
891 cpos_adjusted = 0;
892 update_line (VIS_LINE(linenum), INV_LINE(linenum), linenum,
893 VIS_LLEN(linenum), INV_LLEN(linenum), inv_botlin);
894
895 /* update_line potentially changes _rl_last_c_pos, but doesn't
896 take invisible characters into account, since _rl_last_c_pos
897 is an absolute cursor position in a multibyte locale. See
898 if compensating here is the right thing, or if we have to
899 change update_line itself. There is one case in which
900 update_line adjusts _rl_last_c_pos itself (so it can pass
901 _rl_move_cursor_relative accurate values); it communicates
902 this back by setting cpos_adjusted */
903 if (linenum == 0 && (MB_CUR_MAX > 1 && rl_byte_oriented == 0) &&
904 cpos_adjusted == 0 &&
905 _rl_last_c_pos != o_cpos &&
906 _rl_last_c_pos > wrap_offset &&
907 o_cpos < prompt_last_invisible)
908 _rl_last_c_pos -= wrap_offset;
909
910 /* If this is the line with the prompt, we might need to
911 compensate for invisible characters in the new line. Do
912 this only if there is not more than one new line (which
913 implies that we completely overwrite the old visible line)
914 and the new line is shorter than the old. Make sure we are
915 at the end of the new line before clearing. */
916 if (linenum == 0 &&
917 inv_botlin == 0 && _rl_last_c_pos == out &&
918 (wrap_offset > visible_wrap_offset) &&
919 (_rl_last_c_pos < visible_first_line_len))
920 {
921 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
922 nleft = _rl_screenwidth - _rl_last_c_pos;
923 else
924 nleft = _rl_screenwidth + wrap_offset - _rl_last_c_pos;
925 if (nleft)
926 _rl_clear_to_eol (nleft);
927 }
928
929 /* Since the new first line is now visible, save its length. */
930 if (linenum == 0)
931 visible_first_line_len = (inv_botlin > 0) ? inv_lbreaks[1] : out - wrap_offset;
932 }
933
934 /* We may have deleted some lines. If so, clear the left over
935 blank ones at the bottom out. */
936 if (_rl_vis_botlin > inv_botlin)
937 {
938 char *tt;
939 for (; linenum <= _rl_vis_botlin; linenum++)
940 {
941 tt = VIS_CHARS (linenum);
942 _rl_move_vert (linenum);
943 _rl_move_cursor_relative (0, tt);
944 _rl_clear_to_eol
945 ((linenum == _rl_vis_botlin) ? strlen (tt) : _rl_screenwidth);
946 }
947 }
948 _rl_vis_botlin = inv_botlin;
949
950 /* CHANGED_SCREEN_LINE is set to 1 if we have moved to a
951 different screen line during this redisplay. */
952 changed_screen_line = _rl_last_v_pos != cursor_linenum;
953 if (changed_screen_line)
954 {
955 _rl_move_vert (cursor_linenum);
956 /* If we moved up to the line with the prompt using _rl_term_up,
957 the physical cursor position on the screen stays the same,
958 but the buffer position needs to be adjusted to account
959 for invisible characters. */
960 if ((MB_CUR_MAX == 1 || rl_byte_oriented) && cursor_linenum == 0 && wrap_offset)
961 _rl_last_c_pos += wrap_offset;
962 }
963
964 /* We have to reprint the prompt if it contains invisible
965 characters, since it's not generally OK to just reprint
966 the characters from the current cursor position. But we
967 only need to reprint it if the cursor is before the last
968 invisible character in the prompt string. */
969 nleft = prompt_visible_length + wrap_offset;
970 if (cursor_linenum == 0 && wrap_offset > 0 && _rl_last_c_pos > 0 &&
971 _rl_last_c_pos <= prompt_last_invisible && local_prompt)
972 {
973#if defined (__MSDOS__)
974 putc ('\r', rl_outstream);
975#else
976 if (_rl_term_cr)
977 tputs (_rl_term_cr, 1, _rl_output_character_function);
978#endif
979 _rl_output_some_chars (local_prompt, nleft);
980 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
981 _rl_last_c_pos = _rl_col_width (local_prompt, 0, nleft) - wrap_offset;
982 else
983 _rl_last_c_pos = nleft;
984 }
985
986 /* Where on that line? And where does that line start
987 in the buffer? */
988 pos = inv_lbreaks[cursor_linenum];
989 /* nleft == number of characters in the line buffer between the
990 start of the line and the cursor position. */
991 nleft = c_pos - pos;
992
993 /* NLEFT is now a number of characters in a buffer. When in a
994 multibyte locale, however, _rl_last_c_pos is an absolute cursor
995 position that doesn't take invisible characters in the prompt
996 into account. We use a fudge factor to compensate. */
997
998 /* Since _rl_backspace() doesn't know about invisible characters in the
999 prompt, and there's no good way to tell it, we compensate for
1000 those characters here and call _rl_backspace() directly. */
1001 if (wrap_offset && cursor_linenum == 0 && nleft < _rl_last_c_pos)
1002 {
1003 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1004 tx = _rl_col_width (&visible_line[pos], 0, nleft) - visible_wrap_offset;
1005 else
1006 tx = nleft;
1007 if (_rl_last_c_pos > tx)
1008 {
1009 _rl_backspace (_rl_last_c_pos - tx); /* XXX */
1010 _rl_last_c_pos = tx;
1011 }
1012 }
1013
1014 /* We need to note that in a multibyte locale we are dealing with
1015 _rl_last_c_pos as an absolute cursor position, but moving to a
1016 point specified by a buffer position (NLEFT) that doesn't take
1017 invisible characters into account. */
1018 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1019 _rl_move_cursor_relative (nleft, &invisible_line[pos]);
1020 else if (nleft != _rl_last_c_pos)
1021 _rl_move_cursor_relative (nleft, &invisible_line[pos]);
1022 }
1023 }
1024 else /* Do horizontal scrolling. */
1025 {
1026#define M_OFFSET(margin, offset) ((margin) == 0 ? offset : 0)
1027 int lmargin, ndisp, nleft, phys_c_pos, t;
1028
1029 /* Always at top line. */
1030 _rl_last_v_pos = 0;
1031
1032 /* Compute where in the buffer the displayed line should start. This
1033 will be LMARGIN. */
1034
1035 /* The number of characters that will be displayed before the cursor. */
1036 ndisp = c_pos - wrap_offset;
1037 nleft = prompt_visible_length + wrap_offset;
1038 /* Where the new cursor position will be on the screen. This can be
1039 longer than SCREENWIDTH; if it is, lmargin will be adjusted. */
1040 phys_c_pos = c_pos - (last_lmargin ? last_lmargin : wrap_offset);
1041 t = _rl_screenwidth / 3;
1042
1043 /* If the number of characters had already exceeded the screenwidth,
1044 last_lmargin will be > 0. */
1045
1046 /* If the number of characters to be displayed is more than the screen
1047 width, compute the starting offset so that the cursor is about
1048 two-thirds of the way across the screen. */
1049 if (phys_c_pos > _rl_screenwidth - 2)
1050 {
1051 lmargin = c_pos - (2 * t);
1052 if (lmargin < 0)
1053 lmargin = 0;
1054 /* If the left margin would be in the middle of a prompt with
1055 invisible characters, don't display the prompt at all. */
1056 if (wrap_offset && lmargin > 0 && lmargin < nleft)
1057 lmargin = nleft;
1058 }
1059 else if (ndisp < _rl_screenwidth - 2) /* XXX - was -1 */
1060 lmargin = 0;
1061 else if (phys_c_pos < 1)
1062 {
1063 /* If we are moving back towards the beginning of the line and
1064 the last margin is no longer correct, compute a new one. */
1065 lmargin = ((c_pos - 1) / t) * t; /* XXX */
1066 if (wrap_offset && lmargin > 0 && lmargin < nleft)
1067 lmargin = nleft;
1068 }
1069 else
1070 lmargin = last_lmargin;
1071
1072 /* If the first character on the screen isn't the first character
1073 in the display line, indicate this with a special character. */
1074 if (lmargin > 0)
1075 line[lmargin] = '<';
1076
1077 /* If SCREENWIDTH characters starting at LMARGIN do not encompass
1078 the whole line, indicate that with a special character at the
1079 right edge of the screen. If LMARGIN is 0, we need to take the
1080 wrap offset into account. */
1081 t = lmargin + M_OFFSET (lmargin, wrap_offset) + _rl_screenwidth;
1082 if (t < out)
1083 line[t - 1] = '>';
1084
1085 if (!rl_display_fixed || forced_display || lmargin != last_lmargin)
1086 {
1087 forced_display = 0;
1088 update_line (&visible_line[last_lmargin],
1089 &invisible_line[lmargin],
1090 0,
1091 _rl_screenwidth + visible_wrap_offset,
1092 _rl_screenwidth + (lmargin ? 0 : wrap_offset),
1093 0);
1094
1095 /* If the visible new line is shorter than the old, but the number
1096 of invisible characters is greater, and we are at the end of
1097 the new line, we need to clear to eol. */
1098 t = _rl_last_c_pos - M_OFFSET (lmargin, wrap_offset);
1099 if ((M_OFFSET (lmargin, wrap_offset) > visible_wrap_offset) &&
1100 (_rl_last_c_pos == out) &&
1101 t < visible_first_line_len)
1102 {
1103 nleft = _rl_screenwidth - t;
1104 _rl_clear_to_eol (nleft);
1105 }
1106 visible_first_line_len = out - lmargin - M_OFFSET (lmargin, wrap_offset);
1107 if (visible_first_line_len > _rl_screenwidth)
1108 visible_first_line_len = _rl_screenwidth;
1109
1110 _rl_move_cursor_relative (c_pos - lmargin, &invisible_line[lmargin]);
1111 last_lmargin = lmargin;
1112 }
1113 }
1114 fflush (rl_outstream);
1115
1116 /* Swap visible and non-visible lines. */
1117 {
1118 char *vtemp = visible_line;
1119 int *itemp = vis_lbreaks, ntemp = vis_lbsize;
1120
1121 visible_line = invisible_line;
1122 invisible_line = vtemp;
1123
1124 vis_lbreaks = inv_lbreaks;
1125 inv_lbreaks = itemp;
1126
1127 vis_lbsize = inv_lbsize;
1128 inv_lbsize = ntemp;
1129
1130 rl_display_fixed = 0;
1131 /* If we are displaying on a single line, and last_lmargin is > 0, we
1132 are not displaying any invisible characters, so set visible_wrap_offset
1133 to 0. */
1134 if (_rl_horizontal_scroll_mode && last_lmargin)
1135 visible_wrap_offset = 0;
1136 else
1137 visible_wrap_offset = wrap_offset;
1138 }
1139}
1140
1141/* PWP: update_line() is based on finding the middle difference of each
1142 line on the screen; vis:
1143
1144 /old first difference
1145 /beginning of line | /old last same /old EOL
1146 v v v v
1147old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as
1148new: eddie> Oh, my little buggy says to me, as lurgid as
1149 ^ ^ ^ ^
1150 \beginning of line | \new last same \new end of line
1151 \new first difference
1152
1153 All are character pointers for the sake of speed. Special cases for
1154 no differences, as well as for end of line additions must be handled.
1155
1156 Could be made even smarter, but this works well enough */
1157static void
1158update_line (old, new, current_line, omax, nmax, inv_botlin)
1159 register char *old, *new;
1160 int current_line, omax, nmax, inv_botlin;
1161{
1162 register char *ofd, *ols, *oe, *nfd, *nls, *ne;
1163 int temp, lendiff, wsatend, od, nd;
1164 int current_invis_chars;
1165 int col_lendiff, col_temp;
1166#if defined (HANDLE_MULTIBYTE)
1167 mbstate_t ps_new, ps_old;
1168 int new_offset, old_offset, tmp;
1169#endif
1170
1171 /* If we're at the right edge of a terminal that supports xn, we're
1172 ready to wrap around, so do so. This fixes problems with knowing
1173 the exact cursor position and cut-and-paste with certain terminal
1174 emulators. In this calculation, TEMP is the physical screen
1175 position of the cursor. */
1176 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1177 temp = _rl_last_c_pos;
1178 else
1179 temp = _rl_last_c_pos - W_OFFSET(_rl_last_v_pos, visible_wrap_offset);
1180 if (temp == _rl_screenwidth && _rl_term_autowrap && !_rl_horizontal_scroll_mode
1181 && _rl_last_v_pos == current_line - 1)
1182 {
1183#if defined (HANDLE_MULTIBYTE)
1184 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1185 {
1186 wchar_t wc;
1187 mbstate_t ps;
1188 int tempwidth, bytes;
1189 size_t ret;
1190
1191 /* This fixes only double-column characters, but if the wrapped
1192 character comsumes more than three columns, spaces will be
1193 inserted in the string buffer. */
1194 if (_rl_wrapped_line[current_line] > 0)
1195 _rl_clear_to_eol (_rl_wrapped_line[current_line]);
1196
1197 memset (&ps, 0, sizeof (mbstate_t));
1198 ret = mbrtowc (&wc, new, MB_CUR_MAX, &ps);
1199 if (MB_INVALIDCH (ret))
1200 {
1201 tempwidth = 1;
1202 ret = 1;
1203 }
1204 else if (MB_NULLWCH (ret))
1205 tempwidth = 0;
1206 else
1207 tempwidth = wcwidth (wc);
1208
1209 if (tempwidth > 0)
1210 {
1211 int count;
1212 bytes = ret;
1213 for (count = 0; count < bytes; count++)
1214 putc (new[count], rl_outstream);
1215 _rl_last_c_pos = tempwidth;
1216 _rl_last_v_pos++;
1217 memset (&ps, 0, sizeof (mbstate_t));
1218 ret = mbrtowc (&wc, old, MB_CUR_MAX, &ps);
1219 if (ret != 0 && bytes != 0)
1220 {
1221 if (MB_INVALIDCH (ret))
1222 memmove (old+bytes, old+1, strlen (old+1));
1223 else
1224 memmove (old+bytes, old+ret, strlen (old+ret));
1225 memcpy (old, new, bytes);
1226 }
1227 }
1228 else
1229 {
1230 putc (' ', rl_outstream);
1231 _rl_last_c_pos = 1;
1232 _rl_last_v_pos++;
1233 if (old[0] && new[0])
1234 old[0] = new[0];
1235 }
1236 }
1237 else
1238#endif
1239 {
1240 if (new[0])
1241 putc (new[0], rl_outstream);
1242 else
1243 putc (' ', rl_outstream);
1244 _rl_last_c_pos = 1;
1245 _rl_last_v_pos++;
1246 if (old[0] && new[0])
1247 old[0] = new[0];
1248 }
1249 }
1250
1251
1252 /* Find first difference. */
1253#if defined (HANDLE_MULTIBYTE)
1254 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1255 {
1256 /* See if the old line is a subset of the new line, so that the
1257 only change is adding characters. */
1258 temp = (omax < nmax) ? omax : nmax;
1259 if (memcmp (old, new, temp) == 0)
1260 {
1261 ofd = old + temp;
1262 nfd = new + temp;
1263 }
1264 else
1265 {
1266 memset (&ps_new, 0, sizeof(mbstate_t));
1267 memset (&ps_old, 0, sizeof(mbstate_t));
1268
1269 if (omax == nmax && STREQN (new, old, omax))
1270 {
1271 ofd = old + omax;
1272 nfd = new + nmax;
1273 }
1274 else
1275 {
1276 new_offset = old_offset = 0;
1277 for (ofd = old, nfd = new;
1278 (ofd - old < omax) && *ofd &&
1279 _rl_compare_chars(old, old_offset, &ps_old, new, new_offset, &ps_new); )
1280 {
1281 old_offset = _rl_find_next_mbchar (old, old_offset, 1, MB_FIND_ANY);
1282 new_offset = _rl_find_next_mbchar (new, new_offset, 1, MB_FIND_ANY);
1283 ofd = old + old_offset;
1284 nfd = new + new_offset;
1285 }
1286 }
1287 }
1288 }
1289 else
1290#endif
1291 for (ofd = old, nfd = new;
1292 (ofd - old < omax) && *ofd && (*ofd == *nfd);
1293 ofd++, nfd++)
1294 ;
1295
1296 /* Move to the end of the screen line. ND and OD are used to keep track
1297 of the distance between ne and new and oe and old, respectively, to
1298 move a subtraction out of each loop. */
1299 for (od = ofd - old, oe = ofd; od < omax && *oe; oe++, od++);
1300 for (nd = nfd - new, ne = nfd; nd < nmax && *ne; ne++, nd++);
1301
1302 /* If no difference, continue to next line. */
1303 if (ofd == oe && nfd == ne)
1304 return;
1305
1306 wsatend = 1; /* flag for trailing whitespace */
1307
1308#if defined (HANDLE_MULTIBYTE)
1309 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1310 {
1311 ols = old + _rl_find_prev_mbchar (old, oe - old, MB_FIND_ANY);
1312 nls = new + _rl_find_prev_mbchar (new, ne - new, MB_FIND_ANY);
1313 while ((ols > ofd) && (nls > nfd))
1314 {
1315 memset (&ps_old, 0, sizeof (mbstate_t));
1316 memset (&ps_new, 0, sizeof (mbstate_t));
1317
1318#if 0
1319 /* On advice from jir@yamato.ibm.com */
1320 _rl_adjust_point (old, ols - old, &ps_old);
1321 _rl_adjust_point (new, nls - new, &ps_new);
1322#endif
1323
1324 if (_rl_compare_chars (old, ols - old, &ps_old, new, nls - new, &ps_new) == 0)
1325 break;
1326
1327 if (*ols == ' ')
1328 wsatend = 0;
1329
1330 ols = old + _rl_find_prev_mbchar (old, ols - old, MB_FIND_ANY);
1331 nls = new + _rl_find_prev_mbchar (new, nls - new, MB_FIND_ANY);
1332 }
1333 }
1334 else
1335 {
1336#endif /* HANDLE_MULTIBYTE */
1337 ols = oe - 1; /* find last same */
1338 nls = ne - 1;
1339 while ((ols > ofd) && (nls > nfd) && (*ols == *nls))
1340 {
1341 if (*ols != ' ')
1342 wsatend = 0;
1343 ols--;
1344 nls--;
1345 }
1346#if defined (HANDLE_MULTIBYTE)
1347 }
1348#endif
1349
1350 if (wsatend)
1351 {
1352 ols = oe;
1353 nls = ne;
1354 }
1355#if defined (HANDLE_MULTIBYTE)
1356 /* This may not work for stateful encoding, but who cares? To handle
1357 stateful encoding properly, we have to scan each string from the
1358 beginning and compare. */
1359 else if (_rl_compare_chars (ols, 0, NULL, nls, 0, NULL) == 0)
1360#else
1361 else if (*ols != *nls)
1362#endif
1363 {
1364 if (*ols) /* don't step past the NUL */
1365 {
1366 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1367 ols = old + _rl_find_next_mbchar (old, ols - old, 1, MB_FIND_ANY);
1368 else
1369 ols++;
1370 }
1371 if (*nls)
1372 {
1373 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1374 nls = new + _rl_find_next_mbchar (new, nls - new, 1, MB_FIND_ANY);
1375 else
1376 nls++;
1377 }
1378 }
1379
1380 /* count of invisible characters in the current invisible line. */
1381 current_invis_chars = W_OFFSET (current_line, wrap_offset);
1382 if (_rl_last_v_pos != current_line)
1383 {
1384 _rl_move_vert (current_line);
1385 if ((MB_CUR_MAX == 1 || rl_byte_oriented) && current_line == 0 && visible_wrap_offset)
1386 _rl_last_c_pos += visible_wrap_offset;
1387 }
1388
1389 /* If this is the first line and there are invisible characters in the
1390 prompt string, and the prompt string has not changed, and the current
1391 cursor position is before the last invisible character in the prompt,
1392 and the index of the character to move to is past the end of the prompt
1393 string, then redraw the entire prompt string. We can only do this
1394 reliably if the terminal supports a `cr' capability.
1395
1396 This is not an efficiency hack -- there is a problem with redrawing
1397 portions of the prompt string if they contain terminal escape
1398 sequences (like drawing the `unbold' sequence without a corresponding
1399 `bold') that manifests itself on certain terminals. */
1400
1401 lendiff = local_prompt ? strlen (local_prompt) : 0;
1402 od = ofd - old; /* index of first difference in visible line */
1403 if (current_line == 0 && !_rl_horizontal_scroll_mode &&
1404 _rl_term_cr && lendiff > prompt_visible_length && _rl_last_c_pos > 0 &&
1405 od >= lendiff && _rl_last_c_pos <= prompt_last_invisible)
1406 {
1407#if defined (__MSDOS__)
1408 putc ('\r', rl_outstream);
1409#else
1410 tputs (_rl_term_cr, 1, _rl_output_character_function);
1411#endif
1412 _rl_output_some_chars (local_prompt, lendiff);
1413 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1414 {
1415 /* We take wrap_offset into account here so we can pass correct
1416 information to _rl_move_cursor_relative. */
1417 _rl_last_c_pos = _rl_col_width (local_prompt, 0, lendiff) - wrap_offset;
1418 cpos_adjusted = 1;
1419 }
1420 else
1421 _rl_last_c_pos = lendiff;
1422 }
1423
1424 _rl_move_cursor_relative (od, old);
1425
1426 /* if (len (new) > len (old))
1427 lendiff == difference in buffer
1428 col_lendiff == difference on screen
1429 When not using multibyte characters, these are equal */
1430 lendiff = (nls - nfd) - (ols - ofd);
1431 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1432 col_lendiff = _rl_col_width (new, nfd - new, nls - new) - _rl_col_width (old, ofd - old, ols - old);
1433 else
1434 col_lendiff = lendiff;
1435
1436 /* If we are changing the number of invisible characters in a line, and
1437 the spot of first difference is before the end of the invisible chars,
1438 lendiff needs to be adjusted. */
1439 if (current_line == 0 && !_rl_horizontal_scroll_mode &&
1440 current_invis_chars != visible_wrap_offset)
1441 {
1442 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1443 {
1444 lendiff += visible_wrap_offset - current_invis_chars;
1445 col_lendiff += visible_wrap_offset - current_invis_chars;
1446 }
1447 else
1448 {
1449 lendiff += visible_wrap_offset - current_invis_chars;
1450 col_lendiff = lendiff;
1451 }
1452 }
1453
1454 /* Insert (diff (len (old), len (new)) ch. */
1455 temp = ne - nfd;
1456 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1457 col_temp = _rl_col_width (new, nfd - new, ne - new);
1458 else
1459 col_temp = temp;
1460
1461 if (col_lendiff > 0) /* XXX - was lendiff */
1462 {
1463 /* Non-zero if we're increasing the number of lines. */
1464 int gl = current_line >= _rl_vis_botlin && inv_botlin > _rl_vis_botlin;
1465 /* Sometimes it is cheaper to print the characters rather than
1466 use the terminal's capabilities. If we're growing the number
1467 of lines, make sure we actually cause the new line to wrap
1468 around on auto-wrapping terminals. */
1469 if (_rl_terminal_can_insert && ((2 * col_temp) >= col_lendiff || _rl_term_IC) && (!_rl_term_autowrap || !gl))
1470 {
1471 /* If lendiff > prompt_visible_length and _rl_last_c_pos == 0 and
1472 _rl_horizontal_scroll_mode == 1, inserting the characters with
1473 _rl_term_IC or _rl_term_ic will screw up the screen because of the
1474 invisible characters. We need to just draw them. */
1475 if (*ols && (!_rl_horizontal_scroll_mode || _rl_last_c_pos > 0 ||
1476 lendiff <= prompt_visible_length || !current_invis_chars))
1477 {
1478 insert_some_chars (nfd, lendiff, col_lendiff);
1479 _rl_last_c_pos += col_lendiff;
1480 }
1481 else if ((MB_CUR_MAX == 1 || rl_byte_oriented != 0) && *ols == 0 && lendiff > 0)
1482 {
1483 /* At the end of a line the characters do not have to
1484 be "inserted". They can just be placed on the screen. */
1485 /* However, this screws up the rest of this block, which
1486 assumes you've done the insert because you can. */
1487 _rl_output_some_chars (nfd, lendiff);
1488 _rl_last_c_pos += col_lendiff;
1489 }
1490 else
1491 {
1492 /* We have horizontal scrolling and we are not inserting at
1493 the end. We have invisible characters in this line. This
1494 is a dumb update. */
1495 _rl_output_some_chars (nfd, temp);
1496 _rl_last_c_pos += col_temp;
1497 return;
1498 }
1499 /* Copy (new) chars to screen from first diff to last match. */
1500 temp = nls - nfd;
1501 if ((temp - lendiff) > 0)
1502 {
1503 _rl_output_some_chars (nfd + lendiff, temp - lendiff);
1504#if 1
1505 /* XXX -- this bears closer inspection. Fixes a redisplay bug
1506 reported against bash-3.0-alpha by Andreas Schwab involving
1507 multibyte characters and prompt strings with invisible
1508 characters, but was previously disabled. */
1509 _rl_last_c_pos += _rl_col_width (nfd+lendiff, 0, temp-col_lendiff);
1510#else
1511 _rl_last_c_pos += _rl_col_width (nfd+lendiff, 0, temp-lendiff);
1512#endif
1513 }
1514 }
1515 else
1516 {
1517 /* cannot insert chars, write to EOL */
1518 _rl_output_some_chars (nfd, temp);
1519 _rl_last_c_pos += col_temp;
1520 /* If we're in a multibyte locale and were before the last invisible
1521 char in the current line (which implies we just output some invisible
1522 characters) we need to adjust _rl_last_c_pos, since it represents
1523 a physical character position. */
1524 }
1525 }
1526 else /* Delete characters from line. */
1527 {
1528 /* If possible and inexpensive to use terminal deletion, then do so. */
1529 if (_rl_term_dc && (2 * col_temp) >= -col_lendiff)
1530 {
1531 /* If all we're doing is erasing the invisible characters in the
1532 prompt string, don't bother. It screws up the assumptions
1533 about what's on the screen. */
1534 if (_rl_horizontal_scroll_mode && _rl_last_c_pos == 0 &&
1535 -lendiff == visible_wrap_offset)
1536 col_lendiff = 0;
1537
1538 if (col_lendiff)
1539 delete_chars (-col_lendiff); /* delete (diff) characters */
1540
1541 /* Copy (new) chars to screen from first diff to last match */
1542 temp = nls - nfd;
1543 if (temp > 0)
1544 {
1545 _rl_output_some_chars (nfd, temp);
1546 _rl_last_c_pos += _rl_col_width (nfd, 0, temp);;
1547 }
1548 }
1549 /* Otherwise, print over the existing material. */
1550 else
1551 {
1552 if (temp > 0)
1553 {
1554 _rl_output_some_chars (nfd, temp);
1555 _rl_last_c_pos += col_temp; /* XXX */
1556 }
1557 lendiff = (oe - old) - (ne - new);
1558 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1559 col_lendiff = _rl_col_width (old, 0, oe - old) - _rl_col_width (new, 0, ne - new);
1560 else
1561 col_lendiff = lendiff;
1562
1563 if (col_lendiff)
1564 {
1565 if (_rl_term_autowrap && current_line < inv_botlin)
1566 space_to_eol (col_lendiff);
1567 else
1568 _rl_clear_to_eol (col_lendiff);
1569 }
1570 }
1571 }
1572}
1573
1574/* Tell the update routines that we have moved onto a new (empty) line. */
1575int
1576rl_on_new_line ()
1577{
1578 if (visible_line)
1579 visible_line[0] = '\0';
1580
1581 _rl_last_c_pos = _rl_last_v_pos = 0;
1582 _rl_vis_botlin = last_lmargin = 0;
1583 if (vis_lbreaks)
1584 vis_lbreaks[0] = vis_lbreaks[1] = 0;
1585 visible_wrap_offset = 0;
1586 return 0;
1587}
1588
1589/* Tell the update routines that we have moved onto a new line with the
1590 prompt already displayed. Code originally from the version of readline
1591 distributed with CLISP. rl_expand_prompt must have already been called
1592 (explicitly or implicitly). This still doesn't work exactly right. */
1593int
1594rl_on_new_line_with_prompt ()
1595{
1596 int prompt_size, i, l, real_screenwidth, newlines;
1597 char *prompt_last_line, *lprompt;
1598
1599 /* Initialize visible_line and invisible_line to ensure that they can hold
1600 the already-displayed prompt. */
1601 prompt_size = strlen (rl_prompt) + 1;
1602 init_line_structures (prompt_size);
1603
1604 /* Make sure the line structures hold the already-displayed prompt for
1605 redisplay. */
1606 lprompt = local_prompt ? local_prompt : rl_prompt;
1607 strcpy (visible_line, lprompt);
1608 strcpy (invisible_line, lprompt);
1609
1610 /* If the prompt contains newlines, take the last tail. */
1611 prompt_last_line = strrchr (rl_prompt, '\n');
1612 if (!prompt_last_line)
1613 prompt_last_line = rl_prompt;
1614
1615 l = strlen (prompt_last_line);
1616 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1617 _rl_last_c_pos = _rl_col_width (prompt_last_line, 0, l); /* XXX */
1618 else
1619 _rl_last_c_pos = l;
1620
1621 /* Dissect prompt_last_line into screen lines. Note that here we have
1622 to use the real screenwidth. Readline's notion of screenwidth might be
1623 one less, see terminal.c. */
1624 real_screenwidth = _rl_screenwidth + (_rl_term_autowrap ? 0 : 1);
1625 _rl_last_v_pos = l / real_screenwidth;
1626 /* If the prompt length is a multiple of real_screenwidth, we don't know
1627 whether the cursor is at the end of the last line, or already at the
1628 beginning of the next line. Output a newline just to be safe. */
1629 if (l > 0 && (l % real_screenwidth) == 0)
1630 _rl_output_some_chars ("\n", 1);
1631 last_lmargin = 0;
1632
1633 newlines = 0; i = 0;
1634 while (i <= l)
1635 {
1636 _rl_vis_botlin = newlines;
1637 vis_lbreaks[newlines++] = i;
1638 i += real_screenwidth;
1639 }
1640 vis_lbreaks[newlines] = l;
1641 visible_wrap_offset = 0;
1642
1643 rl_display_prompt = rl_prompt; /* XXX - make sure it's set */
1644
1645 return 0;
1646}
1647
1648/* Actually update the display, period. */
1649int
1650rl_forced_update_display ()
1651{
1652 if (visible_line)
1653 {
1654 register char *temp = visible_line;
1655
1656 while (*temp)
1657 *temp++ = '\0';
1658 }
1659 rl_on_new_line ();
1660 forced_display++;
1661 (*rl_redisplay_function) ();
1662 return 0;
1663}
1664
1665/* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices.
1666 (Well, when we don't have multibyte characters, _rl_last_c_pos is a
1667 buffer index.)
1668 DATA is the contents of the screen line of interest; i.e., where
1669 the movement is being done. */
1670void
1671_rl_move_cursor_relative (new, data)
1672 int new;
1673 const char *data;
1674{
1675 register int i;
1676 int woff; /* number of invisible chars on current line */
1677 int cpos, dpos; /* current and desired cursor positions */
1678
1679 woff = W_OFFSET (_rl_last_v_pos, wrap_offset);
1680 cpos = _rl_last_c_pos;
1681#if defined (HANDLE_MULTIBYTE)
1682 /* If we have multibyte characters, NEW is indexed by the buffer point in
1683 a multibyte string, but _rl_last_c_pos is the display position. In
1684 this case, NEW's display position is not obvious and must be
1685 calculated. We need to account for invisible characters in this line,
1686 as long as we are past them and they are counted by _rl_col_width. */
1687 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1688 {
1689 dpos = _rl_col_width (data, 0, new);
1690 if (dpos > woff)
1691 dpos -= woff;
1692 }
1693 else
1694#endif
1695 dpos = new;
1696
1697 /* If we don't have to do anything, then return. */
1698 if (cpos == dpos)
1699 return;
1700
1701 /* It may be faster to output a CR, and then move forwards instead
1702 of moving backwards. */
1703 /* i == current physical cursor position. */
1704#if defined (HANDLE_MULTIBYTE)
1705 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1706 i = _rl_last_c_pos;
1707 else
1708#endif
1709 i = _rl_last_c_pos - woff;
1710 if (new == 0 || CR_FASTER (new, _rl_last_c_pos) ||
1711 (_rl_term_autowrap && i == _rl_screenwidth))
1712 {
1713#if defined (__MSDOS__)
1714 putc ('\r', rl_outstream);
1715#else
1716 tputs (_rl_term_cr, 1, _rl_output_character_function);
1717#endif /* !__MSDOS__ */
1718 cpos = _rl_last_c_pos = 0;
1719 }
1720
1721 if (cpos < dpos)
1722 {
1723 /* Move the cursor forward. We do it by printing the command
1724 to move the cursor forward if there is one, else print that
1725 portion of the output buffer again. Which is cheaper? */
1726
1727 /* The above comment is left here for posterity. It is faster
1728 to print one character (non-control) than to print a control
1729 sequence telling the terminal to move forward one character.
1730 That kind of control is for people who don't know what the
1731 data is underneath the cursor. */
1732#if defined (HACK_TERMCAP_MOTION)
1733 if (_rl_term_forward_char)
1734 {
1735 for (i = cpos; i < dpos; i++)
1736 tputs (_rl_term_forward_char, 1, _rl_output_character_function);
1737 }
1738 else
1739#endif /* HACK_TERMCAP_MOTION */
1740 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1741 {
1742 tputs (_rl_term_cr, 1, _rl_output_character_function);
1743 for (i = 0; i < new; i++)
1744 putc (data[i], rl_outstream);
1745 }
1746 else
1747 for (i = cpos; i < new; i++)
1748 putc (data[i], rl_outstream);
1749 }
1750
1751#if defined (HANDLE_MULTIBYTE)
1752 /* NEW points to the buffer point, but _rl_last_c_pos is the display point.
1753 The byte length of the string is probably bigger than the column width
1754 of the string, which means that if NEW == _rl_last_c_pos, then NEW's
1755 display point is less than _rl_last_c_pos. */
1756#endif
1757 else if (cpos > dpos)
1758 _rl_backspace (cpos - dpos);
1759
1760 _rl_last_c_pos = dpos;
1761}
1762
1763/* PWP: move the cursor up or down. */
1764void
1765_rl_move_vert (to)
1766 int to;
1767{
1768 register int delta, i;
1769
1770 if (_rl_last_v_pos == to || to > _rl_screenheight)
1771 return;
1772
1773 if ((delta = to - _rl_last_v_pos) > 0)
1774 {
1775 for (i = 0; i < delta; i++)
1776 putc ('\n', rl_outstream);
1777#if defined (__MSDOS__)
1778 putc ('\r', rl_outstream);
1779#else
1780 tputs (_rl_term_cr, 1, _rl_output_character_function);
1781#endif
1782 _rl_last_c_pos = 0;
1783 }
1784 else
1785 { /* delta < 0 */
1786 if (_rl_term_up && *_rl_term_up)
1787 for (i = 0; i < -delta; i++)
1788 tputs (_rl_term_up, 1, _rl_output_character_function);
1789 }
1790
1791 _rl_last_v_pos = to; /* Now TO is here */
1792}
1793
1794/* Physically print C on rl_outstream. This is for functions which know
1795 how to optimize the display. Return the number of characters output. */
1796int
1797rl_show_char (c)
1798 int c;
1799{
1800 int n = 1;
1801 if (META_CHAR (c) && (_rl_output_meta_chars == 0))
1802 {
1803 fprintf (rl_outstream, "M-");
1804 n += 2;
1805 c = UNMETA (c);
1806 }
1807
1808#if defined (DISPLAY_TABS)
1809 if ((CTRL_CHAR (c) && c != '\t') || c == RUBOUT)
1810#else
1811 if (CTRL_CHAR (c) || c == RUBOUT)
1812#endif /* !DISPLAY_TABS */
1813 {
1814 fprintf (rl_outstream, "C-");
1815 n += 2;
1816 c = CTRL_CHAR (c) ? UNCTRL (c) : '?';
1817 }
1818
1819 putc (c, rl_outstream);
1820 fflush (rl_outstream);
1821 return n;
1822}
1823
1824int
1825rl_character_len (c, pos)
1826 register int c, pos;
1827{
1828 unsigned char uc;
1829
1830 uc = (unsigned char)c;
1831
1832 if (META_CHAR (uc))
1833 return ((_rl_output_meta_chars == 0) ? 4 : 1);
1834
1835 if (uc == '\t')
1836 {
1837#if defined (DISPLAY_TABS)
1838 return (((pos | 7) + 1) - pos);
1839#else
1840 return (2);
1841#endif /* !DISPLAY_TABS */
1842 }
1843
1844 if (CTRL_CHAR (c) || c == RUBOUT)
1845 return (2);
1846
1847 return ((ISPRINT (uc)) ? 1 : 2);
1848}
1849/* How to print things in the "echo-area". The prompt is treated as a
1850 mini-modeline. */
1851static int msg_saved_prompt = 0;
1852
1853#if defined (USE_VARARGS)
1854int
1855#if defined (PREFER_STDARG)
1856rl_message (const char *format, ...)
1857#else
1858rl_message (va_alist)
1859 va_dcl
1860#endif
1861{
1862 va_list args;
1863#if defined (PREFER_VARARGS)
1864 char *format;
1865#endif
1866
1867#if defined (PREFER_STDARG)
1868 va_start (args, format);
1869#else
1870 va_start (args);
1871 format = va_arg (args, char *);
1872#endif
1873
1874#if defined (HAVE_VSNPRINTF)
1875 vsnprintf (msg_buf, sizeof (msg_buf) - 1, format, args);
1876#else
1877 vsprintf (msg_buf, format, args);
1878 msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */
1879#endif
1880 va_end (args);
1881
1882 if (saved_local_prompt == 0)
1883 {
1884 rl_save_prompt ();
1885 msg_saved_prompt = 1;
1886 }
1887 rl_display_prompt = msg_buf;
1888 local_prompt = expand_prompt (msg_buf, &prompt_visible_length,
1889 &prompt_last_invisible,
1890 &prompt_invis_chars_first_line,
1891 &prompt_physical_chars);
1892 local_prompt_prefix = (char *)NULL;
1893 (*rl_redisplay_function) ();
1894
1895 return 0;
1896}
1897#else /* !USE_VARARGS */
1898int
1899rl_message (format, arg1, arg2)
1900 char *format;
1901{
1902 sprintf (msg_buf, format, arg1, arg2);
1903 msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */
1904
1905 rl_display_prompt = msg_buf;
1906 if (saved_local_prompt == 0)
1907 {
1908 rl_save_prompt ();
1909 msg_saved_prompt = 1;
1910 }
1911 local_prompt = expand_prompt (msg_buf, &prompt_visible_length,
1912 &prompt_last_invisible,
1913 &prompt_invis_chars_first_line,
1914 &prompt_physical_chars);
1915 local_prompt_prefix = (char *)NULL;
1916 (*rl_redisplay_function) ();
1917
1918 return 0;
1919}
1920#endif /* !USE_VARARGS */
1921
1922/* How to clear things from the "echo-area". */
1923int
1924rl_clear_message ()
1925{
1926 rl_display_prompt = rl_prompt;
1927 if (msg_saved_prompt)
1928 {
1929 rl_restore_prompt ();
1930 msg_saved_prompt = 0;
1931 }
1932 (*rl_redisplay_function) ();
1933 return 0;
1934}
1935
1936int
1937rl_reset_line_state ()
1938{
1939 rl_on_new_line ();
1940
1941 rl_display_prompt = rl_prompt ? rl_prompt : "";
1942 forced_display = 1;
1943 return 0;
1944}
1945
1946void
1947rl_save_prompt ()
1948{
1949 saved_local_prompt = local_prompt;
1950 saved_local_prefix = local_prompt_prefix;
1951 saved_prefix_length = prompt_prefix_length;
1952 saved_last_invisible = prompt_last_invisible;
1953 saved_visible_length = prompt_visible_length;
1954 saved_invis_chars_first_line = prompt_invis_chars_first_line;
1955 saved_physical_chars = prompt_physical_chars;
1956
1957 local_prompt = local_prompt_prefix = (char *)0;
1958 prompt_last_invisible = prompt_visible_length = prompt_prefix_length = 0;
1959 prompt_invis_chars_first_line = prompt_physical_chars = 0;
1960}
1961
1962void
1963rl_restore_prompt ()
1964{
1965 FREE (local_prompt);
1966 FREE (local_prompt_prefix);
1967
1968 local_prompt = saved_local_prompt;
1969 local_prompt_prefix = saved_local_prefix;
1970 prompt_prefix_length = saved_prefix_length;
1971 prompt_last_invisible = saved_last_invisible;
1972 prompt_visible_length = saved_visible_length;
1973 prompt_invis_chars_first_line = saved_invis_chars_first_line;
1974 prompt_physical_chars = saved_physical_chars;
1975
1976 /* can test saved_local_prompt to see if prompt info has been saved. */
1977 saved_local_prompt = saved_local_prefix = (char *)0;
1978 saved_last_invisible = saved_visible_length = saved_prefix_length = 0;
1979 saved_invis_chars_first_line = saved_physical_chars = 0;
1980}
1981
1982char *
1983_rl_make_prompt_for_search (pchar)
1984 int pchar;
1985{
1986 int len;
|