2 /* display.c -- readline redisplay facility. */
4 /* Copyright (C) 1987-2006 Free Software Foundation, Inc.
6 This file is part of the GNU Readline Library, a library for
7 reading lines of text with interactive input and history editing.
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.
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.
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
25 #if defined (HAVE_CONFIG_H)
29 #include <sys/types.h>
31 #if defined (HAVE_UNISTD_H)
33 #endif /* HAVE_UNISTD_H */
35 #include "posixstat.h"
37 #if defined (HAVE_STDLIB_H)
40 # include "ansi_stdlib.h"
41 #endif /* HAVE_STDLIB_H */
45 /* System-specific feature definitions and include files. */
49 /* Termcap library stuff. */
52 /* Some standard library routines. */
56 #include "rlprivate.h"
59 #if !defined (strchr) && !defined (__STDC__)
60 extern char *strchr (), *strrchr ();
61 #endif /* !strchr && !__STDC__ */
63 static void update_line PARAMS((char *, char *, int, int, int, int));
64 static void space_to_eol PARAMS((int));
65 static void delete_chars PARAMS((int));
66 static void insert_some_chars PARAMS((char *, int, int));
67 static void cr PARAMS((void));
69 #if defined (HANDLE_MULTIBYTE)
70 static int _rl_col_width PARAMS((const char *, int, int));
71 static int *_rl_wrapped_line;
73 # define _rl_col_width(l, s, e) (((e) <= (s)) ? 0 : (e) - (s))
76 static int *inv_lbreaks, *vis_lbreaks;
77 static int inv_lbsize, vis_lbsize;
79 /* Heuristic used to decide whether it is faster to move from CUR to NEW
80 by backing up or outputting a carriage return and moving forward. CUR
81 and NEW are either both buffer positions or absolute screen positions. */
82 #define CR_FASTER(new, cur) (((new) + 1) < ((cur) - (new)))
84 /* _rl_last_c_pos is an absolute cursor position in multibyte locales and a
85 buffer index in others. This macro is used when deciding whether the
86 current cursor position is in the middle of a prompt string containing
87 invisible characters. */
88 #define PROMPT_ENDING_INDEX \
89 ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) ? prompt_physical_chars : prompt_last_invisible+1)
92 /* **************************************************************** */
96 /* **************************************************************** */
98 /* This is the stuff that is hard for me. I never seem to write good
99 display routines in C. Let's see how I do this time. */
101 /* (PWP) Well... Good for a simple line updater, but totally ignores
102 the problems of input lines longer than the screen width.
104 update_line and the code that calls it makes a multiple line,
105 automatically wrapping line update. Careful attention needs
106 to be paid to the vertical position variables. */
108 /* Keep two buffers; one which reflects the current contents of the
109 screen, and the other to draw what we think the new contents should
110 be. Then compare the buffers, and make whatever changes to the
111 screen itself that we should. Finally, make the buffer that we
112 just drew into be the one which reflects the current contents of the
113 screen, and place the cursor where it belongs.
115 Commands that want to can fix the display themselves, and then let
116 this function know that the display has been fixed by setting the
117 RL_DISPLAY_FIXED variable. This is good for efficiency. */
119 /* Application-specific redisplay function. */
120 rl_voidfunc_t *rl_redisplay_function = rl_redisplay;
122 /* Global variables declared here. */
123 /* What YOU turn on when you have handled all redisplay yourself. */
124 int rl_display_fixed = 0;
126 int _rl_suppress_redisplay = 0;
127 int _rl_want_redisplay = 0;
129 /* The stuff that gets printed out before the actual text of the line.
130 This is usually pointing to rl_prompt. */
131 char *rl_display_prompt = (char *)NULL;
133 /* Pseudo-global variables declared here. */
135 /* The visible cursor position. If you print some text, adjust this. */
136 /* NOTE: _rl_last_c_pos is used as a buffer index when not in a locale
137 supporting multibyte characters, and an absolute cursor position when
138 in such a locale. This is an artifact of the donated multibyte support.
139 Care must be taken when modifying its value. */
140 int _rl_last_c_pos = 0;
141 int _rl_last_v_pos = 0;
143 static int cpos_adjusted;
144 static int cpos_buffer_position;
146 /* Number of lines currently on screen minus 1. */
147 int _rl_vis_botlin = 0;
149 /* Variables used only in this file. */
150 /* The last left edge of text that was displayed. This is used when
151 doing horizontal scrolling. It shifts in thirds of a screenwidth. */
152 static int last_lmargin;
154 /* The line display buffers. One is the line currently displayed on
155 the screen. The other is the line about to be displayed. */
156 static char *visible_line = (char *)NULL;
157 static char *invisible_line = (char *)NULL;
159 /* A buffer for `modeline' messages. */
160 static char msg_buf[128];
162 /* Non-zero forces the redisplay even if we thought it was unnecessary. */
163 static int forced_display;
165 /* Default and initial buffer size. Can grow. */
166 static int line_size = 1024;
168 /* Variables to keep track of the expanded prompt string, which may
169 include invisible characters. */
171 static char *local_prompt, *local_prompt_prefix;
172 static int local_prompt_len;
173 static int prompt_visible_length, prompt_prefix_length;
175 /* The number of invisible characters in the line currently being
176 displayed on the screen. */
177 static int visible_wrap_offset;
179 /* The number of invisible characters in the prompt string. Static so it
180 can be shared between rl_redisplay and update_line */
181 static int wrap_offset;
183 /* The index of the last invisible character in the prompt string. */
184 static int prompt_last_invisible;
186 /* The length (buffer offset) of the first line of the last (possibly
187 multi-line) buffer displayed on the screen. */
188 static int visible_first_line_len;
190 /* Number of invisible characters on the first physical line of the prompt.
191 Only valid when the number of physical characters in the prompt exceeds
192 (or is equal to) _rl_screenwidth. */
193 static int prompt_invis_chars_first_line;
195 static int prompt_last_screen_line;
197 static int prompt_physical_chars;
199 /* Variables to save and restore prompt and display information. */
201 /* These are getting numerous enough that it's time to create a struct. */
203 static char *saved_local_prompt;
204 static char *saved_local_prefix;
205 static int saved_last_invisible;
206 static int saved_visible_length;
207 static int saved_prefix_length;
208 static int saved_local_length;
209 static int saved_invis_chars_first_line;
210 static int saved_physical_chars;
212 /* Expand the prompt string S and return the number of visible
213 characters in *LP, if LP is not null. This is currently more-or-less
214 a placeholder for expansion. LIP, if non-null is a place to store the
215 index of the last invisible character in the returned string. NIFLP,
216 if non-zero, is a place to store the number of invisible characters in
217 the first prompt line. The previous are used as byte counts -- indexes
218 into a character buffer. */
220 /* Current implementation:
221 \001 (^A) start non-visible characters
222 \002 (^B) end non-visible characters
223 all characters except \001 and \002 (following a \001) are copied to
224 the returned string; all characters except those between \001 and
225 \002 are assumed to be `visible'. */
228 expand_prompt (pmt, lp, lip, niflp, vlp)
230 int *lp, *lip, *niflp, *vlp;
232 char *r, *ret, *p, *igstart;
233 int l, rl, last, ignoring, ninvis, invfl, invflset, ind, pind, physchars;
235 /* Short-circuit if we can. */
236 if ((MB_CUR_MAX <= 1 || rl_byte_oriented) && strchr (pmt, RL_PROMPT_START_IGNORE) == 0)
238 r = savestring (pmt);
246 *vlp = lp ? *lp : strlen (r);
251 r = ret = (char *)xmalloc (l + 1);
253 invfl = 0; /* invisible chars in first line of prompt */
254 invflset = 0; /* we only want to set invfl once */
257 for (rl = ignoring = last = ninvis = physchars = 0, p = pmt; p && *p; p++)
259 /* This code strips the invisible character string markers
260 RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */
261 if (ignoring == 0 && *p == RL_PROMPT_START_IGNORE) /* XXX - check ignoring? */
267 else if (ignoring && *p == RL_PROMPT_END_IGNORE)
270 if (p != (igstart + 1))
276 #if defined (HANDLE_MULTIBYTE)
277 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
280 ind = _rl_find_next_mbchar (pmt, pind, 1, MB_FIND_NONZERO);
287 physchars += _rl_col_width (pmt, pind, ind);
290 ninvis += ind - pind;
291 p--; /* compensate for later increment */
299 rl++; /* visible length byte counter */
303 ninvis++; /* invisible chars byte counter */
306 if (invflset == 0 && rl >= _rl_screenwidth)
314 if (rl < _rl_screenwidth)
329 /* Just strip out RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE from
330 PMT and return the rest of PMT. */
332 _rl_strip_prompt (pmt)
337 ret = expand_prompt (pmt, (int *)NULL, (int *)NULL, (int *)NULL, (int *)NULL);
342 * Expand the prompt string into the various display components, if
345 * local_prompt = expanded last line of string in rl_display_prompt
346 * (portion after the final newline)
347 * local_prompt_prefix = portion before last newline of rl_display_prompt,
348 * expanded via expand_prompt
349 * prompt_visible_length = number of visible characters in local_prompt
350 * prompt_prefix_length = number of visible characters in local_prompt_prefix
352 * This function is called once per call to readline(). It may also be
353 * called arbitrarily to expand the primary prompt.
355 * The return value is the number of visible characters on the last line
356 * of the (possibly multi-line) prompt.
359 rl_expand_prompt (prompt)
365 /* Clear out any saved values. */
367 FREE (local_prompt_prefix);
369 local_prompt = local_prompt_prefix = (char *)0;
370 local_prompt_len = 0;
371 prompt_last_invisible = prompt_invis_chars_first_line = 0;
372 prompt_visible_length = prompt_physical_chars = 0;
374 if (prompt == 0 || *prompt == 0)
377 p = strrchr (prompt, '\n');
380 /* The prompt is only one logical line, though it might wrap. */
381 local_prompt = expand_prompt (prompt, &prompt_visible_length,
382 &prompt_last_invisible,
383 &prompt_invis_chars_first_line,
384 &prompt_physical_chars);
385 local_prompt_prefix = (char *)0;
386 local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
387 return (prompt_visible_length);
391 /* The prompt spans multiple lines. */
393 local_prompt = expand_prompt (p, &prompt_visible_length,
394 &prompt_last_invisible,
395 &prompt_invis_chars_first_line,
396 &prompt_physical_chars);
398 /* The portion of the prompt string up to and including the
399 final newline is now null-terminated. */
400 local_prompt_prefix = expand_prompt (prompt, &prompt_prefix_length,
405 local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
406 return (prompt_prefix_length);
410 /* Initialize the VISIBLE_LINE and INVISIBLE_LINE arrays, and their associated
411 arrays of line break markers. MINSIZE is the minimum size of VISIBLE_LINE
412 and INVISIBLE_LINE; if it is greater than LINE_SIZE, LINE_SIZE is
413 increased. If the lines have already been allocated, this ensures that
414 they can hold at least MINSIZE characters. */
416 init_line_structures (minsize)
421 if (invisible_line == 0) /* initialize it */
423 if (line_size < minsize)
425 visible_line = (char *)xmalloc (line_size);
426 invisible_line = (char *)xmalloc (line_size);
428 else if (line_size < minsize) /* ensure it can hold MINSIZE chars */
431 if (line_size < minsize)
433 visible_line = (char *)xrealloc (visible_line, line_size);
434 invisible_line = (char *)xrealloc (invisible_line, line_size);
437 for (n = minsize; n < line_size; n++)
440 invisible_line[n] = 1;
443 if (vis_lbreaks == 0)
445 /* should be enough. */
446 inv_lbsize = vis_lbsize = 256;
447 inv_lbreaks = (int *)xmalloc (inv_lbsize * sizeof (int));
448 vis_lbreaks = (int *)xmalloc (vis_lbsize * sizeof (int));
449 #if defined (HANDLE_MULTIBYTE)
450 _rl_wrapped_line = (int *)xmalloc (vis_lbsize * sizeof (int));
452 inv_lbreaks[0] = vis_lbreaks[0] = 0;
456 /* Basic redisplay algorithm. */
460 register int in, out, c, linenum, cursor_linenum;
462 int inv_botlin, lb_botlin, lb_linenum, o_cpos;
463 int newlines, lpos, temp, modmark, n0, num;
464 char *prompt_this_line;
465 #if defined (HANDLE_MULTIBYTE)
470 int _rl_wrapped_multicolumn = 0;
473 if (!readline_echoing_p)
476 if (!rl_display_prompt)
477 rl_display_prompt = "";
479 if (invisible_line == 0 || vis_lbreaks == 0)
481 init_line_structures (0);
485 /* Draw the line into the buffer. */
486 cpos_buffer_position = -1;
488 line = invisible_line;
489 out = inv_botlin = 0;
491 /* Mark the line as modified or not. We only do this for history
494 if (_rl_mark_modified_lines && current_history () && rl_undo_list)
501 /* If someone thought that the redisplay was handled, but the currently
502 visible line has a different modification state than the one about
503 to become visible, then correct the caller's misconception. */
504 if (visible_line[0] != invisible_line[0])
505 rl_display_fixed = 0;
507 /* If the prompt to be displayed is the `primary' readline prompt (the
508 one passed to readline()), use the values we have already expanded.
509 If not, use what's already in rl_display_prompt. WRAP_OFFSET is the
510 number of non-visible characters in the prompt string. */
511 if (rl_display_prompt == rl_prompt || local_prompt)
513 if (local_prompt_prefix && forced_display)
514 _rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix));
516 if (local_prompt_len > 0)
518 temp = local_prompt_len + out + 2;
519 if (temp >= line_size)
521 line_size = (temp + 1024) - (temp % 1024);
522 visible_line = (char *)xrealloc (visible_line, line_size);
523 line = invisible_line = (char *)xrealloc (invisible_line, line_size);
525 strncpy (line + out, local_prompt, local_prompt_len);
526 out += local_prompt_len;
529 wrap_offset = local_prompt_len - prompt_visible_length;
534 prompt_this_line = strrchr (rl_display_prompt, '\n');
535 if (!prompt_this_line)
536 prompt_this_line = rl_display_prompt;
540 pmtlen = prompt_this_line - rl_display_prompt; /* temp var */
543 _rl_output_some_chars (rl_display_prompt, pmtlen);
544 /* Make sure we are at column zero even after a newline,
545 regardless of the state of terminal output processing. */
546 if (pmtlen < 2 || prompt_this_line[-2] != '\r')
551 prompt_physical_chars = pmtlen = strlen (prompt_this_line);
552 temp = pmtlen + out + 2;
553 if (temp >= line_size)
555 line_size = (temp + 1024) - (temp % 1024);
556 visible_line = (char *)xrealloc (visible_line, line_size);
557 line = invisible_line = (char *)xrealloc (invisible_line, line_size);
559 strncpy (line + out, prompt_this_line, pmtlen);
562 wrap_offset = prompt_invis_chars_first_line = 0;
565 #if defined (HANDLE_MULTIBYTE)
566 #define CHECK_INV_LBREAKS() \
568 if (newlines >= (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)); \
576 #define CHECK_INV_LBREAKS() \
578 if (newlines >= (inv_lbsize - 2)) \
581 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
584 #endif /* HANDLE_MULTIBYTE */
586 #if defined (HANDLE_MULTIBYTE)
587 #define CHECK_LPOS() \
590 if (lpos >= _rl_screenwidth) \
592 if (newlines >= (inv_lbsize - 2)) \
595 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
596 _rl_wrapped_line = (int *)xrealloc (_rl_wrapped_line, inv_lbsize * sizeof (int)); \
598 inv_lbreaks[++newlines] = out; \
599 _rl_wrapped_line[newlines] = _rl_wrapped_multicolumn; \
604 #define CHECK_LPOS() \
607 if (lpos >= _rl_screenwidth) \
609 if (newlines >= (inv_lbsize - 2)) \
612 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
614 inv_lbreaks[++newlines] = out; \
620 /* inv_lbreaks[i] is where line i starts in the buffer. */
621 inv_lbreaks[newlines = 0] = 0;
623 lpos = out - wrap_offset;
625 lpos = prompt_physical_chars + modmark;
628 #if defined (HANDLE_MULTIBYTE)
629 memset (_rl_wrapped_line, 0, vis_lbsize);
633 /* prompt_invis_chars_first_line is the number of invisible characters in
634 the first physical line of the prompt.
635 wrap_offset - prompt_invis_chars_first_line is the number of invis
636 chars on the second line. */
638 /* what if lpos is already >= _rl_screenwidth before we start drawing the
639 contents of the command line? */
640 while (lpos >= _rl_screenwidth)
643 /* fix from Darin Johnson <darin@acuson.com> for prompt string with
644 invisible characters that is longer than the screen width. The
645 prompt_invis_chars_first_line variable could be made into an array
646 saying how many invisible characters there are per line, but that's
647 probably too much work for the benefit gained. How many people have
648 prompts that exceed two physical lines?
649 Additional logic fix from Edward Catmur <ed@catmur.co.uk> */
650 #if defined (HANDLE_MULTIBYTE)
651 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
654 temp = local_prompt_len;
657 z = _rl_col_width (local_prompt, n0, num);
658 if (z > _rl_screenwidth)
660 num = _rl_find_prev_mbchar (local_prompt, num, MB_FIND_ANY);
663 else if (z == _rl_screenwidth)
670 #endif /* !HANDLE_MULTIBYTE */
671 temp = ((newlines + 1) * _rl_screenwidth);
673 /* Now account for invisible characters in the current line. */
674 temp += ((local_prompt_prefix == 0) ? ((newlines == 0) ? prompt_invis_chars_first_line
675 : ((newlines == 1) ? wrap_offset : 0))
676 : ((newlines == 0) ? wrap_offset :0));
678 inv_lbreaks[++newlines] = temp;
679 #if defined (HANDLE_MULTIBYTE)
680 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
681 lpos -= _rl_col_width (local_prompt, n0, num);
684 lpos -= _rl_screenwidth;
687 prompt_last_screen_line = newlines;
689 /* Draw the rest of the line (after the prompt) into invisible_line, keeping
690 track of where the cursor is (cpos_buffer_position), the number of the line containing
691 the cursor (lb_linenum), the last line number (lb_botlin and inv_botlin).
692 It maintains an array of line breaks for display (inv_lbreaks).
693 This handles expanding tabs for display and displaying meta characters. */
695 #if defined (HANDLE_MULTIBYTE)
697 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
699 memset (&ps, 0, sizeof (mbstate_t));
700 wc_bytes = mbrtowc (&wc, rl_line_buffer, rl_end, &ps);
706 for (in = 0; in < rl_end; in++)
709 c = (unsigned char)rl_line_buffer[in];
711 #if defined (HANDLE_MULTIBYTE)
712 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
714 if (MB_INVALIDCH (wc_bytes))
716 /* Byte sequence is invalid or shortened. Assume that the
717 first byte represents a character. */
719 /* Assume that a character occupies a single column. */
721 memset (&ps, 0, sizeof (mbstate_t));
723 else if (MB_NULLWCH (wc_bytes))
724 break; /* Found '\0' */
728 wc_width = (temp >= 0) ? temp : 1;
733 if (out + 8 >= line_size) /* XXX - 8 for \t */
736 visible_line = (char *)xrealloc (visible_line, line_size);
737 invisible_line = (char *)xrealloc (invisible_line, line_size);
738 line = invisible_line;
743 cpos_buffer_position = out;
744 lb_linenum = newlines;
747 #if defined (HANDLE_MULTIBYTE)
748 if (META_CHAR (c) && _rl_output_meta_chars == 0) /* XXX - clean up */
753 if (_rl_output_meta_chars == 0)
755 sprintf (line + out, "\\%o", c);
757 if (lpos + 4 >= _rl_screenwidth)
759 temp = _rl_screenwidth - lpos;
760 CHECK_INV_LBREAKS ();
761 inv_lbreaks[++newlines] = out + temp;
775 #if defined (DISPLAY_TABS)
781 newout = (out | (int)7) + 1;
783 newout = out + 8 - lpos % 8;
786 if (lpos + temp >= _rl_screenwidth)
789 temp2 = _rl_screenwidth - lpos;
790 CHECK_INV_LBREAKS ();
791 inv_lbreaks[++newlines] = out + temp2;
804 else if (c == '\n' && _rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up)
806 line[out++] = '\0'; /* XXX - sentinel */
807 CHECK_INV_LBREAKS ();
808 inv_lbreaks[++newlines] = out;
811 else if (CTRL_CHAR (c) || c == RUBOUT)
815 line[out++] = CTRL_CHAR (c) ? UNCTRL (c) : '?';
820 #if defined (HANDLE_MULTIBYTE)
821 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
825 _rl_wrapped_multicolumn = 0;
827 if (_rl_screenwidth < lpos + wc_width)
828 for (i = lpos; i < _rl_screenwidth; i++)
830 /* The space will be removed in update_line() */
832 _rl_wrapped_multicolumn++;
837 cpos_buffer_position = out;
838 lb_linenum = newlines;
840 for (i = in; i < in+wc_bytes; i++)
841 line[out++] = rl_line_buffer[i];
842 for (i = 0; i < wc_width; i++)
856 #if defined (HANDLE_MULTIBYTE)
857 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
860 wc_bytes = mbrtowc (&wc, rl_line_buffer + in, rl_end - in, &ps);
868 if (cpos_buffer_position < 0)
870 cpos_buffer_position = out;
871 lb_linenum = newlines;
874 inv_botlin = lb_botlin = newlines;
875 CHECK_INV_LBREAKS ();
876 inv_lbreaks[newlines+1] = out;
877 cursor_linenum = lb_linenum;
879 /* CPOS_BUFFER_POSITION == position in buffer where cursor should be placed.
880 CURSOR_LINENUM == line number where the cursor should be placed. */
882 /* PWP: now is when things get a bit hairy. The visible and invisible
883 line buffers are really multiple lines, which would wrap every
884 (screenwidth - 1) characters. Go through each in turn, finding
885 the changed region and updating it. The line order is top to bottom. */
887 /* If we can move the cursor up and down, then use multiple lines,
888 otherwise, let long lines display in a single terminal line, and
889 horizontally scroll it. */
891 if (_rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up)
893 int nleft, pos, changed_screen_line, tx;
895 if (!rl_display_fixed || forced_display)
899 /* If we have more than a screenful of material to display, then
900 only display a screenful. We should display the last screen,
902 if (out >= _rl_screenchars)
904 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
905 out = _rl_find_prev_mbchar (line, _rl_screenchars, MB_FIND_ANY);
907 out = _rl_screenchars - 1;
910 /* The first line is at character position 0 in the buffer. The
911 second and subsequent lines start at inv_lbreaks[N], offset by
912 OFFSET (which has already been calculated above). */
914 #define INVIS_FIRST() (prompt_physical_chars > _rl_screenwidth ? prompt_invis_chars_first_line : wrap_offset)
915 #define WRAP_OFFSET(line, offset) ((line == 0) \
916 ? (offset ? INVIS_FIRST() : 0) \
917 : ((line == prompt_last_screen_line) ? wrap_offset-prompt_invis_chars_first_line : 0))
918 #define W_OFFSET(line, offset) ((line) == 0 ? offset : 0)
919 #define VIS_LLEN(l) ((l) > _rl_vis_botlin ? 0 : (vis_lbreaks[l+1] - vis_lbreaks[l]))
920 #define INV_LLEN(l) (inv_lbreaks[l+1] - inv_lbreaks[l])
921 #define VIS_CHARS(line) (visible_line + vis_lbreaks[line])
922 #define VIS_LINE(line) ((line) > _rl_vis_botlin) ? "" : VIS_CHARS(line)
923 #define INV_LINE(line) (invisible_line + inv_lbreaks[line])
925 /* For each line in the buffer, do the updating display. */
926 for (linenum = 0; linenum <= inv_botlin; linenum++)
928 /* This can lead us astray if we execute a program that changes
929 the locale from a non-multibyte to a multibyte one. */
930 o_cpos = _rl_last_c_pos;
932 update_line (VIS_LINE(linenum), INV_LINE(linenum), linenum,
933 VIS_LLEN(linenum), INV_LLEN(linenum), inv_botlin);
935 /* update_line potentially changes _rl_last_c_pos, but doesn't
936 take invisible characters into account, since _rl_last_c_pos
937 is an absolute cursor position in a multibyte locale. See
938 if compensating here is the right thing, or if we have to
939 change update_line itself. There is one case in which
940 update_line adjusts _rl_last_c_pos itself (so it can pass
941 _rl_move_cursor_relative accurate values); it communicates
942 this back by setting cpos_adjusted. If we assume that
943 _rl_last_c_pos is correct (an absolute cursor position) each
944 time update_line is called, then we can assume in our
945 calculations that o_cpos does not need to be adjusted by
947 if (linenum == 0 && (MB_CUR_MAX > 1 && rl_byte_oriented == 0) &&
948 cpos_adjusted == 0 &&
949 _rl_last_c_pos != o_cpos &&
950 _rl_last_c_pos > wrap_offset &&
951 o_cpos < prompt_last_invisible)
952 _rl_last_c_pos -= prompt_invis_chars_first_line; /* XXX - was wrap_offset */
953 else if (linenum == prompt_last_screen_line && prompt_physical_chars > _rl_screenwidth &&
954 (MB_CUR_MAX > 1 && rl_byte_oriented == 0) &&
955 cpos_adjusted == 0 &&
956 _rl_last_c_pos != o_cpos &&
957 _rl_last_c_pos > (prompt_last_invisible - _rl_screenwidth - prompt_invis_chars_first_line))
958 _rl_last_c_pos -= (wrap_offset-prompt_invis_chars_first_line);
960 /* If this is the line with the prompt, we might need to
961 compensate for invisible characters in the new line. Do
962 this only if there is not more than one new line (which
963 implies that we completely overwrite the old visible line)
964 and the new line is shorter than the old. Make sure we are
965 at the end of the new line before clearing. */
967 inv_botlin == 0 && _rl_last_c_pos == out &&
968 (wrap_offset > visible_wrap_offset) &&
969 (_rl_last_c_pos < visible_first_line_len))
971 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
972 nleft = _rl_screenwidth - _rl_last_c_pos;
974 nleft = _rl_screenwidth + wrap_offset - _rl_last_c_pos;
976 _rl_clear_to_eol (nleft);
979 /* Since the new first line is now visible, save its length. */
981 visible_first_line_len = (inv_botlin > 0) ? inv_lbreaks[1] : out - wrap_offset;
984 /* We may have deleted some lines. If so, clear the left over
985 blank ones at the bottom out. */
986 if (_rl_vis_botlin > inv_botlin)
989 for (; linenum <= _rl_vis_botlin; linenum++)
991 tt = VIS_CHARS (linenum);
992 _rl_move_vert (linenum);
993 _rl_move_cursor_relative (0, tt);
995 ((linenum == _rl_vis_botlin) ? strlen (tt) : _rl_screenwidth);
998 _rl_vis_botlin = inv_botlin;
1000 /* CHANGED_SCREEN_LINE is set to 1 if we have moved to a
1001 different screen line during this redisplay. */
1002 changed_screen_line = _rl_last_v_pos != cursor_linenum;
1003 if (changed_screen_line)
1005 _rl_move_vert (cursor_linenum);
1006 /* If we moved up to the line with the prompt using _rl_term_up,
1007 the physical cursor position on the screen stays the same,
1008 but the buffer position needs to be adjusted to account
1009 for invisible characters. */
1010 if ((MB_CUR_MAX == 1 || rl_byte_oriented) && cursor_linenum == 0 && wrap_offset)
1011 _rl_last_c_pos += wrap_offset;
1014 /* We have to reprint the prompt if it contains invisible
1015 characters, since it's not generally OK to just reprint
1016 the characters from the current cursor position. But we
1017 only need to reprint it if the cursor is before the last
1018 invisible character in the prompt string. */
1019 nleft = prompt_visible_length + wrap_offset;
1020 if (cursor_linenum == 0 && wrap_offset > 0 && _rl_last_c_pos > 0 &&
1022 _rl_last_c_pos <= PROMPT_ENDING_INDEX && local_prompt)
1024 _rl_last_c_pos < PROMPT_ENDING_INDEX && local_prompt)
1027 #if defined (__MSDOS__)
1028 putc ('\r', rl_outstream);
1031 tputs (_rl_term_cr, 1, _rl_output_character_function);
1033 _rl_output_some_chars (local_prompt, nleft);
1034 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1035 _rl_last_c_pos = _rl_col_width (local_prompt, 0, nleft) - wrap_offset;
1037 _rl_last_c_pos = nleft;
1040 /* Where on that line? And where does that line start
1042 pos = inv_lbreaks[cursor_linenum];
1043 /* nleft == number of characters in the line buffer between the
1044 start of the line and the desired cursor position. */
1045 nleft = cpos_buffer_position - pos;
1047 /* NLEFT is now a number of characters in a buffer. When in a
1048 multibyte locale, however, _rl_last_c_pos is an absolute cursor
1049 position that doesn't take invisible characters in the prompt
1050 into account. We use a fudge factor to compensate. */
1052 /* Since _rl_backspace() doesn't know about invisible characters in the
1053 prompt, and there's no good way to tell it, we compensate for
1054 those characters here and call _rl_backspace() directly. */
1055 if (wrap_offset && cursor_linenum == 0 && nleft < _rl_last_c_pos)
1057 /* TX == new physical cursor position in multibyte locale. */
1058 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1059 tx = _rl_col_width (&visible_line[pos], 0, nleft) - visible_wrap_offset;
1062 if (tx >= 0 && _rl_last_c_pos > tx)
1064 _rl_backspace (_rl_last_c_pos - tx); /* XXX */
1065 _rl_last_c_pos = tx;
1069 /* We need to note that in a multibyte locale we are dealing with
1070 _rl_last_c_pos as an absolute cursor position, but moving to a
1071 point specified by a buffer position (NLEFT) that doesn't take
1072 invisible characters into account. */
1073 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1074 _rl_move_cursor_relative (nleft, &invisible_line[pos]);
1075 else if (nleft != _rl_last_c_pos)
1076 _rl_move_cursor_relative (nleft, &invisible_line[pos]);
1079 else /* Do horizontal scrolling. */
1081 #define M_OFFSET(margin, offset) ((margin) == 0 ? offset : 0)
1082 int lmargin, ndisp, nleft, phys_c_pos, t;
1084 /* Always at top line. */
1087 /* Compute where in the buffer the displayed line should start. This
1090 /* The number of characters that will be displayed before the cursor. */
1091 ndisp = cpos_buffer_position - wrap_offset;
1092 nleft = prompt_visible_length + wrap_offset;
1093 /* Where the new cursor position will be on the screen. This can be
1094 longer than SCREENWIDTH; if it is, lmargin will be adjusted. */
1095 phys_c_pos = cpos_buffer_position - (last_lmargin ? last_lmargin : wrap_offset);
1096 t = _rl_screenwidth / 3;
1098 /* If the number of characters had already exceeded the screenwidth,
1099 last_lmargin will be > 0. */
1101 /* If the number of characters to be displayed is more than the screen
1102 width, compute the starting offset so that the cursor is about
1103 two-thirds of the way across the screen. */
1104 if (phys_c_pos > _rl_screenwidth - 2)
1106 lmargin = cpos_buffer_position - (2 * t);
1109 /* If the left margin would be in the middle of a prompt with
1110 invisible characters, don't display the prompt at all. */
1111 if (wrap_offset && lmargin > 0 && lmargin < nleft)
1114 else if (ndisp < _rl_screenwidth - 2) /* XXX - was -1 */
1116 else if (phys_c_pos < 1)
1118 /* If we are moving back towards the beginning of the line and
1119 the last margin is no longer correct, compute a new one. */
1120 lmargin = ((cpos_buffer_position - 1) / t) * t; /* XXX */
1121 if (wrap_offset && lmargin > 0 && lmargin < nleft)
1125 lmargin = last_lmargin;
1127 /* If the first character on the screen isn't the first character
1128 in the display line, indicate this with a special character. */
1130 line[lmargin] = '<';
1132 /* If SCREENWIDTH characters starting at LMARGIN do not encompass
1133 the whole line, indicate that with a special character at the
1134 right edge of the screen. If LMARGIN is 0, we need to take the
1135 wrap offset into account. */
1136 t = lmargin + M_OFFSET (lmargin, wrap_offset) + _rl_screenwidth;
1140 if (!rl_display_fixed || forced_display || lmargin != last_lmargin)
1143 update_line (&visible_line[last_lmargin],
1144 &invisible_line[lmargin],
1146 _rl_screenwidth + visible_wrap_offset,
1147 _rl_screenwidth + (lmargin ? 0 : wrap_offset),
1150 /* If the visible new line is shorter than the old, but the number
1151 of invisible characters is greater, and we are at the end of
1152 the new line, we need to clear to eol. */
1153 t = _rl_last_c_pos - M_OFFSET (lmargin, wrap_offset);
1154 if ((M_OFFSET (lmargin, wrap_offset) > visible_wrap_offset) &&
1155 (_rl_last_c_pos == out) &&
1156 t < visible_first_line_len)
1158 nleft = _rl_screenwidth - t;
1159 _rl_clear_to_eol (nleft);
1161 visible_first_line_len = out - lmargin - M_OFFSET (lmargin, wrap_offset);
1162 if (visible_first_line_len > _rl_screenwidth)
1163 visible_first_line_len = _rl_screenwidth;
1165 _rl_move_cursor_relative (cpos_buffer_position - lmargin, &invisible_line[lmargin]);
1166 last_lmargin = lmargin;
1169 fflush (rl_outstream);
1171 /* Swap visible and non-visible lines. */
1173 char *vtemp = visible_line;
1174 int *itemp = vis_lbreaks, ntemp = vis_lbsize;
1176 visible_line = invisible_line;
1177 invisible_line = vtemp;
1179 vis_lbreaks = inv_lbreaks;
1180 inv_lbreaks = itemp;
1182 vis_lbsize = inv_lbsize;
1185 rl_display_fixed = 0;
1186 /* If we are displaying on a single line, and last_lmargin is > 0, we
1187 are not displaying any invisible characters, so set visible_wrap_offset
1189 if (_rl_horizontal_scroll_mode && last_lmargin)
1190 visible_wrap_offset = 0;
1192 visible_wrap_offset = wrap_offset;
1196 /* PWP: update_line() is based on finding the middle difference of each
1197 line on the screen; vis:
1199 /old first difference
1200 /beginning of line | /old last same /old EOL
1202 old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as
1203 new: eddie> Oh, my little buggy says to me, as lurgid as
1205 \beginning of line | \new last same \new end of line
1206 \new first difference
1208 All are character pointers for the sake of speed. Special cases for
1209 no differences, as well as for end of line additions must be handled.
1211 Could be made even smarter, but this works well enough */
1213 update_line (old, new, current_line, omax, nmax, inv_botlin)
1214 register char *old, *new;
1215 int current_line, omax, nmax, inv_botlin;
1217 register char *ofd, *ols, *oe, *nfd, *nls, *ne;
1218 int temp, lendiff, wsatend, od, nd, twidth, o_cpos;
1219 int current_invis_chars;
1220 int col_lendiff, col_temp;
1221 #if defined (HANDLE_MULTIBYTE)
1222 mbstate_t ps_new, ps_old;
1223 int new_offset, old_offset;
1226 /* If we're at the right edge of a terminal that supports xn, we're
1227 ready to wrap around, so do so. This fixes problems with knowing
1228 the exact cursor position and cut-and-paste with certain terminal
1229 emulators. In this calculation, TEMP is the physical screen
1230 position of the cursor. */
1231 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1232 temp = _rl_last_c_pos;
1234 temp = _rl_last_c_pos - WRAP_OFFSET (_rl_last_v_pos, visible_wrap_offset);
1235 if (temp == _rl_screenwidth && _rl_term_autowrap && !_rl_horizontal_scroll_mode
1236 && _rl_last_v_pos == current_line - 1)
1238 #if defined (HANDLE_MULTIBYTE)
1239 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1243 int tempwidth, bytes;
1246 /* This fixes only double-column characters, but if the wrapped
1247 character comsumes more than three columns, spaces will be
1248 inserted in the string buffer. */
1249 if (_rl_wrapped_line[current_line] > 0)
1250 _rl_clear_to_eol (_rl_wrapped_line[current_line]);
1252 memset (&ps, 0, sizeof (mbstate_t));
1253 ret = mbrtowc (&wc, new, MB_CUR_MAX, &ps);
1254 if (MB_INVALIDCH (ret))
1259 else if (MB_NULLWCH (ret))
1262 tempwidth = wcwidth (wc);
1268 for (count = 0; count < bytes; count++)
1269 putc (new[count], rl_outstream);
1270 _rl_last_c_pos = tempwidth;
1272 memset (&ps, 0, sizeof (mbstate_t));
1273 ret = mbrtowc (&wc, old, MB_CUR_MAX, &ps);
1274 if (ret != 0 && bytes != 0)
1276 if (MB_INVALIDCH (ret))
1277 memmove (old+bytes, old+1, strlen (old+1));
1279 memmove (old+bytes, old+ret, strlen (old+ret));
1280 memcpy (old, new, bytes);
1285 putc (' ', rl_outstream);
1288 if (old[0] && new[0])
1296 putc (new[0], rl_outstream);
1298 putc (' ', rl_outstream);
1301 if (old[0] && new[0])
1307 /* Find first difference. */
1308 #if defined (HANDLE_MULTIBYTE)
1309 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1311 /* See if the old line is a subset of the new line, so that the
1312 only change is adding characters. */
1313 temp = (omax < nmax) ? omax : nmax;
1314 if (memcmp (old, new, temp) == 0)
1321 memset (&ps_new, 0, sizeof(mbstate_t));
1322 memset (&ps_old, 0, sizeof(mbstate_t));
1324 if (omax == nmax && STREQN (new, old, omax))
1331 new_offset = old_offset = 0;
1332 for (ofd = old, nfd = new;
1333 (ofd - old < omax) && *ofd &&
1334 _rl_compare_chars(old, old_offset, &ps_old, new, new_offset, &ps_new); )
1336 old_offset = _rl_find_next_mbchar (old, old_offset, 1, MB_FIND_ANY);
1337 new_offset = _rl_find_next_mbchar (new, new_offset, 1, MB_FIND_ANY);
1338 ofd = old + old_offset;
1339 nfd = new + new_offset;
1346 for (ofd = old, nfd = new;
1347 (ofd - old < omax) && *ofd && (*ofd == *nfd);
1351 /* Move to the end of the screen line. ND and OD are used to keep track
1352 of the distance between ne and new and oe and old, respectively, to
1353 move a subtraction out of each loop. */
1354 for (od = ofd - old, oe = ofd; od < omax && *oe; oe++, od++);
1355 for (nd = nfd - new, ne = nfd; nd < nmax && *ne; ne++, nd++);
1357 /* If no difference, continue to next line. */
1358 if (ofd == oe && nfd == ne)
1361 wsatend = 1; /* flag for trailing whitespace */
1363 #if defined (HANDLE_MULTIBYTE)
1364 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1366 ols = old + _rl_find_prev_mbchar (old, oe - old, MB_FIND_ANY);
1367 nls = new + _rl_find_prev_mbchar (new, ne - new, MB_FIND_ANY);
1368 while ((ols > ofd) && (nls > nfd))
1370 memset (&ps_old, 0, sizeof (mbstate_t));
1371 memset (&ps_new, 0, sizeof (mbstate_t));
1374 /* On advice from jir@yamato.ibm.com */
1375 _rl_adjust_point (old, ols - old, &ps_old);
1376 _rl_adjust_point (new, nls - new, &ps_new);
1379 if (_rl_compare_chars (old, ols - old, &ps_old, new, nls - new, &ps_new) == 0)
1385 ols = old + _rl_find_prev_mbchar (old, ols - old, MB_FIND_ANY);
1386 nls = new + _rl_find_prev_mbchar (new, nls - new, MB_FIND_ANY);
1391 #endif /* HANDLE_MULTIBYTE */
1392 ols = oe - 1; /* find last same */
1394 while ((ols > ofd) && (nls > nfd) && (*ols == *nls))
1401 #if defined (HANDLE_MULTIBYTE)
1410 #if defined (HANDLE_MULTIBYTE)
1411 /* This may not work for stateful encoding, but who cares? To handle
1412 stateful encoding properly, we have to scan each string from the
1413 beginning and compare. */
1414 else if (_rl_compare_chars (ols, 0, NULL, nls, 0, NULL) == 0)
1416 else if (*ols != *nls)
1419 if (*ols) /* don't step past the NUL */
1421 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1422 ols = old + _rl_find_next_mbchar (old, ols - old, 1, MB_FIND_ANY);
1428 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1429 nls = new + _rl_find_next_mbchar (new, nls - new, 1, MB_FIND_ANY);
1435 /* count of invisible characters in the current invisible line. */
1436 current_invis_chars = W_OFFSET (current_line, wrap_offset);
1437 if (_rl_last_v_pos != current_line)
1439 _rl_move_vert (current_line);
1440 if ((MB_CUR_MAX == 1 || rl_byte_oriented) && current_line == 0 && visible_wrap_offset)
1441 _rl_last_c_pos += visible_wrap_offset;
1444 /* If this is the first line and there are invisible characters in the
1445 prompt string, and the prompt string has not changed, and the current
1446 cursor position is before the last invisible character in the prompt,
1447 and the index of the character to move to is past the end of the prompt
1448 string, then redraw the entire prompt string. We can only do this
1449 reliably if the terminal supports a `cr' capability.
1451 This is not an efficiency hack -- there is a problem with redrawing
1452 portions of the prompt string if they contain terminal escape
1453 sequences (like drawing the `unbold' sequence without a corresponding
1454 `bold') that manifests itself on certain terminals. */
1456 lendiff = local_prompt_len;
1457 od = ofd - old; /* index of first difference in visible line */
1458 if (current_line == 0 && !_rl_horizontal_scroll_mode &&
1459 _rl_term_cr && lendiff > prompt_visible_length && _rl_last_c_pos > 0 &&
1460 od >= lendiff && _rl_last_c_pos < PROMPT_ENDING_INDEX)
1462 #if defined (__MSDOS__)
1463 putc ('\r', rl_outstream);
1465 tputs (_rl_term_cr, 1, _rl_output_character_function);
1467 _rl_output_some_chars (local_prompt, lendiff);
1468 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1470 /* We take wrap_offset into account here so we can pass correct
1471 information to _rl_move_cursor_relative. */
1472 _rl_last_c_pos = _rl_col_width (local_prompt, 0, lendiff) - wrap_offset;
1476 _rl_last_c_pos = lendiff;
1479 o_cpos = _rl_last_c_pos;
1481 /* When this function returns, _rl_last_c_pos is correct, and an absolute
1482 cursor postion in multibyte mode, but a buffer index when not in a
1483 multibyte locale. */
1484 _rl_move_cursor_relative (od, old);
1486 #if defined (HANDLE_MULTIBYTE)
1487 /* We need to indicate that the cursor position is correct in the presence of
1488 invisible characters in the prompt string. Let's see if setting this when
1489 we make sure we're at the end of the drawn prompt string works. */
1490 if (current_line == 0 && MB_CUR_MAX > 1 && rl_byte_oriented == 0 &&
1491 (_rl_last_c_pos > 0 || o_cpos > 0) &&
1492 _rl_last_c_pos == prompt_physical_chars)
1497 /* if (len (new) > len (old))
1498 lendiff == difference in buffer
1499 col_lendiff == difference on screen
1500 When not using multibyte characters, these are equal */
1501 lendiff = (nls - nfd) - (ols - ofd);
1502 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1503 col_lendiff = _rl_col_width (new, nfd - new, nls - new) - _rl_col_width (old, ofd - old, ols - old);
1505 col_lendiff = lendiff;
1507 /* If we are changing the number of invisible characters in a line, and
1508 the spot of first difference is before the end of the invisible chars,
1509 lendiff needs to be adjusted. */
1510 if (current_line == 0 && !_rl_horizontal_scroll_mode &&
1511 current_invis_chars != visible_wrap_offset)
1513 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1515 lendiff += visible_wrap_offset - current_invis_chars;
1516 col_lendiff += visible_wrap_offset - current_invis_chars;
1520 lendiff += visible_wrap_offset - current_invis_chars;
1521 col_lendiff = lendiff;
1525 /* Insert (diff (len (old), len (new)) ch. */
1527 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1528 col_temp = _rl_col_width (new, nfd - new, ne - new);
1532 if (col_lendiff > 0) /* XXX - was lendiff */
1534 /* Non-zero if we're increasing the number of lines. */
1535 int gl = current_line >= _rl_vis_botlin && inv_botlin > _rl_vis_botlin;
1536 /* If col_lendiff is > 0, implying that the new string takes up more
1537 screen real estate than the old, but lendiff is < 0, meaning that it
1538 takes fewer bytes, we need to just output the characters starting
1539 from the first difference. These will overwrite what is on the
1540 display, so there's no reason to do a smart update. This can really
1541 only happen in a multibyte environment. */
1544 _rl_output_some_chars (nfd, temp);
1545 _rl_last_c_pos += _rl_col_width (nfd, 0, temp);
1546 /* If nfd begins before any invisible characters in the prompt,
1547 adjust _rl_last_c_pos to account for wrap_offset and set
1548 cpos_adjusted to let the caller know. */
1549 if (current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible))
1551 _rl_last_c_pos -= wrap_offset;
1556 /* Sometimes it is cheaper to print the characters rather than
1557 use the terminal's capabilities. If we're growing the number
1558 of lines, make sure we actually cause the new line to wrap
1559 around on auto-wrapping terminals. */
1560 else if (_rl_terminal_can_insert && ((2 * col_temp) >= col_lendiff || _rl_term_IC) && (!_rl_term_autowrap || !gl))
1562 /* If lendiff > prompt_visible_length and _rl_last_c_pos == 0 and
1563 _rl_horizontal_scroll_mode == 1, inserting the characters with
1564 _rl_term_IC or _rl_term_ic will screw up the screen because of the
1565 invisible characters. We need to just draw them. */
1566 if (*ols && (!_rl_horizontal_scroll_mode || _rl_last_c_pos > 0 ||
1567 lendiff <= prompt_visible_length || !current_invis_chars))
1569 insert_some_chars (nfd, lendiff, col_lendiff);
1570 _rl_last_c_pos += col_lendiff;
1572 else if ((MB_CUR_MAX == 1 || rl_byte_oriented != 0) && *ols == 0 && lendiff > 0)
1574 /* At the end of a line the characters do not have to
1575 be "inserted". They can just be placed on the screen. */
1576 /* However, this screws up the rest of this block, which
1577 assumes you've done the insert because you can. */
1578 _rl_output_some_chars (nfd, lendiff);
1579 _rl_last_c_pos += col_lendiff;
1583 _rl_output_some_chars (nfd, temp);
1584 _rl_last_c_pos += col_temp;
1585 /* If nfd begins before any invisible characters in the prompt,
1586 adjust _rl_last_c_pos to account for wrap_offset and set
1587 cpos_adjusted to let the caller know. */
1588 if (current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible))
1590 _rl_last_c_pos -= wrap_offset;
1595 /* Copy (new) chars to screen from first diff to last match. */
1597 if ((temp - lendiff) > 0)
1599 _rl_output_some_chars (nfd + lendiff, temp - lendiff);
1600 /* XXX -- this bears closer inspection. Fixes a redisplay bug
1601 reported against bash-3.0-alpha by Andreas Schwab involving
1602 multibyte characters and prompt strings with invisible
1603 characters, but was previously disabled. */
1604 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1605 twidth = _rl_col_width (nfd+lendiff, 0, temp-col_lendiff);
1607 twidth = temp - lendiff;
1608 _rl_last_c_pos += twidth;
1613 /* cannot insert chars, write to EOL */
1614 _rl_output_some_chars (nfd, temp);
1615 _rl_last_c_pos += col_temp;
1616 /* If we're in a multibyte locale and were before the last invisible
1617 char in the current line (which implies we just output some invisible
1618 characters) we need to adjust _rl_last_c_pos, since it represents
1619 a physical character position. */
1622 else /* Delete characters from line. */
1624 /* If possible and inexpensive to use terminal deletion, then do so. */
1625 if (_rl_term_dc && (2 * col_temp) >= -col_lendiff)
1627 /* If all we're doing is erasing the invisible characters in the
1628 prompt string, don't bother. It screws up the assumptions
1629 about what's on the screen. */
1630 if (_rl_horizontal_scroll_mode && _rl_last_c_pos == 0 &&
1631 -lendiff == visible_wrap_offset)
1635 delete_chars (-col_lendiff); /* delete (diff) characters */
1637 /* Copy (new) chars to screen from first diff to last match */
1641 /* If nfd begins at the prompt, or before the invisible
1642 characters in the prompt, we need to adjust _rl_last_c_pos
1643 in a multibyte locale to account for the wrap offset and
1644 set cpos_adjusted accordingly. */
1645 _rl_output_some_chars (nfd, temp);
1646 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1648 _rl_last_c_pos += _rl_col_width (nfd, 0, temp);
1649 if (current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible))
1651 _rl_last_c_pos -= wrap_offset;
1656 _rl_last_c_pos += temp;
1659 /* Otherwise, print over the existing material. */
1664 /* If nfd begins at the prompt, or before the invisible
1665 characters in the prompt, we need to adjust _rl_last_c_pos
1666 in a multibyte locale to account for the wrap offset and
1667 set cpos_adjusted accordingly. */
1668 _rl_output_some_chars (nfd, temp);
1669 _rl_last_c_pos += col_temp; /* XXX */
1670 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1672 if (current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible))
1674 _rl_last_c_pos -= wrap_offset;
1679 lendiff = (oe - old) - (ne - new);
1680 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1681 col_lendiff = _rl_col_width (old, 0, oe - old) - _rl_col_width (new, 0, ne - new);
1683 col_lendiff = lendiff;
1687 if (_rl_term_autowrap && current_line < inv_botlin)
1688 space_to_eol (col_lendiff);
1690 _rl_clear_to_eol (col_lendiff);
1696 /* Tell the update routines that we have moved onto a new (empty) line. */
1701 visible_line[0] = '\0';
1703 _rl_last_c_pos = _rl_last_v_pos = 0;
1704 _rl_vis_botlin = last_lmargin = 0;
1706 vis_lbreaks[0] = vis_lbreaks[1] = 0;
1707 visible_wrap_offset = 0;
1711 /* Tell the update routines that we have moved onto a new line with the
1712 prompt already displayed. Code originally from the version of readline
1713 distributed with CLISP. rl_expand_prompt must have already been called
1714 (explicitly or implicitly). This still doesn't work exactly right. */
1716 rl_on_new_line_with_prompt ()
1718 int prompt_size, i, l, real_screenwidth, newlines;
1719 char *prompt_last_line, *lprompt;
1721 /* Initialize visible_line and invisible_line to ensure that they can hold
1722 the already-displayed prompt. */
1723 prompt_size = strlen (rl_prompt) + 1;
1724 init_line_structures (prompt_size);
1726 /* Make sure the line structures hold the already-displayed prompt for
1728 lprompt = local_prompt ? local_prompt : rl_prompt;
1729 strcpy (visible_line, lprompt);
1730 strcpy (invisible_line, lprompt);
1732 /* If the prompt contains newlines, take the last tail. */
1733 prompt_last_line = strrchr (rl_prompt, '\n');
1734 if (!prompt_last_line)
1735 prompt_last_line = rl_prompt;
1737 l = strlen (prompt_last_line);
1738 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1739 _rl_last_c_pos = _rl_col_width (prompt_last_line, 0, l); /* XXX */
1743 /* Dissect prompt_last_line into screen lines. Note that here we have
1744 to use the real screenwidth. Readline's notion of screenwidth might be
1745 one less, see terminal.c. */
1746 real_screenwidth = _rl_screenwidth + (_rl_term_autowrap ? 0 : 1);
1747 _rl_last_v_pos = l / real_screenwidth;
1748 /* If the prompt length is a multiple of real_screenwidth, we don't know
1749 whether the cursor is at the end of the last line, or already at the
1750 beginning of the next line. Output a newline just to be safe. */
1751 if (l > 0 && (l % real_screenwidth) == 0)
1752 _rl_output_some_chars ("\n", 1);
1755 newlines = 0; i = 0;
1758 _rl_vis_botlin = newlines;
1759 vis_lbreaks[newlines++] = i;
1760 i += real_screenwidth;
1762 vis_lbreaks[newlines] = l;
1763 visible_wrap_offset = 0;
1765 rl_display_prompt = rl_prompt; /* XXX - make sure it's set */
1770 /* Actually update the display, period. */
1772 rl_forced_update_display ()
1774 register char *temp;
1778 temp = visible_line;
1784 (*rl_redisplay_function) ();
1788 /* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices.
1789 (Well, when we don't have multibyte characters, _rl_last_c_pos is a
1791 DATA is the contents of the screen line of interest; i.e., where
1792 the movement is being done. */
1794 _rl_move_cursor_relative (new, data)
1799 int woff; /* number of invisible chars on current line */
1800 int cpos, dpos; /* current and desired cursor positions */
1802 woff = WRAP_OFFSET (_rl_last_v_pos, wrap_offset);
1803 cpos = _rl_last_c_pos;
1804 #if defined (HANDLE_MULTIBYTE)
1805 /* If we have multibyte characters, NEW is indexed by the buffer point in
1806 a multibyte string, but _rl_last_c_pos is the display position. In
1807 this case, NEW's display position is not obvious and must be
1808 calculated. We need to account for invisible characters in this line,
1809 as long as we are past them and they are counted by _rl_col_width. */
1810 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1812 dpos = _rl_col_width (data, 0, new);
1813 /* Use NEW when comparing against the last invisible character in the
1814 prompt string, since they're both buffer indices and DPOS is a
1815 desired display position. */
1816 if ((new > prompt_last_invisible) || /* XXX - don't use woff here */
1817 (prompt_physical_chars > _rl_screenwidth &&
1818 _rl_last_v_pos == prompt_last_screen_line &&
1819 wrap_offset != woff &&
1820 new > (prompt_last_invisible-_rl_screenwidth-wrap_offset)))
1823 /* Since this will be assigned to _rl_last_c_pos at the end (more
1824 precisely, _rl_last_c_pos == dpos when this function returns),
1825 let the caller know. */
1833 /* If we don't have to do anything, then return. */
1837 /* It may be faster to output a CR, and then move forwards instead
1838 of moving backwards. */
1839 /* i == current physical cursor position. */
1840 #if defined (HANDLE_MULTIBYTE)
1841 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1845 i = _rl_last_c_pos - woff;
1846 if (dpos == 0 || CR_FASTER (dpos, _rl_last_c_pos) ||
1847 (_rl_term_autowrap && i == _rl_screenwidth))
1849 #if defined (__MSDOS__)
1850 putc ('\r', rl_outstream);
1852 tputs (_rl_term_cr, 1, _rl_output_character_function);
1853 #endif /* !__MSDOS__ */
1854 cpos = _rl_last_c_pos = 0;
1859 /* Move the cursor forward. We do it by printing the command
1860 to move the cursor forward if there is one, else print that
1861 portion of the output buffer again. Which is cheaper? */
1863 /* The above comment is left here for posterity. It is faster
1864 to print one character (non-control) than to print a control
1865 sequence telling the terminal to move forward one character.
1866 That kind of control is for people who don't know what the
1867 data is underneath the cursor. */
1869 /* However, we need a handle on where the current display position is
1870 in the buffer for the immediately preceding comment to be true.
1871 In multibyte locales, we don't currently have that info available.
1872 Without it, we don't know where the data we have to display begins
1873 in the buffer and we have to go back to the beginning of the screen
1874 line. In this case, we can use the terminal sequence to move forward
1875 if it's available. */
1876 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1878 if (_rl_term_forward_char)
1880 for (i = cpos; i < dpos; i++)
1881 tputs (_rl_term_forward_char, 1, _rl_output_character_function);
1885 tputs (_rl_term_cr, 1, _rl_output_character_function);
1886 for (i = 0; i < new; i++)
1887 putc (data[i], rl_outstream);
1891 for (i = cpos; i < new; i++)
1892 putc (data[i], rl_outstream);
1895 #if defined (HANDLE_MULTIBYTE)
1896 /* NEW points to the buffer point, but _rl_last_c_pos is the display point.
1897 The byte length of the string is probably bigger than the column width
1898 of the string, which means that if NEW == _rl_last_c_pos, then NEW's
1899 display point is less than _rl_last_c_pos. */
1901 else if (cpos > dpos)
1902 _rl_backspace (cpos - dpos);
1904 _rl_last_c_pos = dpos;
1907 /* PWP: move the cursor up or down. */
1912 register int delta, i;
1914 if (_rl_last_v_pos == to || to > _rl_screenheight)
1917 if ((delta = to - _rl_last_v_pos) > 0)
1919 for (i = 0; i < delta; i++)
1920 putc ('\n', rl_outstream);
1921 #if defined (__MSDOS__)
1922 putc ('\r', rl_outstream);
1924 tputs (_rl_term_cr, 1, _rl_output_character_function);
1930 if (_rl_term_up && *_rl_term_up)
1931 for (i = 0; i < -delta; i++)
1932 tputs (_rl_term_up, 1, _rl_output_character_function);
1935 _rl_last_v_pos = to; /* Now TO is here */
1938 /* Physically print C on rl_outstream. This is for functions which know
1939 how to optimize the display. Return the number of characters output. */
1945 if (META_CHAR (c) && (_rl_output_meta_chars == 0))
1947 fprintf (rl_outstream, "M-");
1952 #if defined (DISPLAY_TABS)
1953 if ((CTRL_CHAR (c) && c != '\t') || c == RUBOUT)
1955 if (CTRL_CHAR (c) || c == RUBOUT)
1956 #endif /* !DISPLAY_TABS */
1958 fprintf (rl_outstream, "C-");
1960 c = CTRL_CHAR (c) ? UNCTRL (c) : '?';
1963 putc (c, rl_outstream);
1964 fflush (rl_outstream);
1969 rl_character_len (c, pos)
1970 register int c, pos;
1974 uc = (unsigned char)c;
1977 return ((_rl_output_meta_chars == 0) ? 4 : 1);
1981 #if defined (DISPLAY_TABS)
1982 return (((pos | 7) + 1) - pos);
1985 #endif /* !DISPLAY_TABS */
1988 if (CTRL_CHAR (c) || c == RUBOUT)
1991 return ((ISPRINT (uc)) ? 1 : 2);
1993 /* How to print things in the "echo-area". The prompt is treated as a
1995 static int msg_saved_prompt = 0;
1997 #if defined (USE_VARARGS)
1999 #if defined (PREFER_STDARG)
2000 rl_message (const char *format, ...)
2002 rl_message (va_alist)
2007 #if defined (PREFER_VARARGS)
2011 #if defined (PREFER_STDARG)
2012 va_start (args, format);
2015 format = va_arg (args, char *);
2018 #if defined (HAVE_VSNPRINTF)
2019 vsnprintf (msg_buf, sizeof (msg_buf) - 1, format, args);
2021 vsprintf (msg_buf, format, args);
2022 msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */
2026 if (saved_local_prompt == 0)
2029 msg_saved_prompt = 1;
2031 rl_display_prompt = msg_buf;
2032 local_prompt = expand_prompt (msg_buf, &prompt_visible_length,
2033 &prompt_last_invisible,
2034 &prompt_invis_chars_first_line,
2035 &prompt_physical_chars);
2036 local_prompt_prefix = (char *)NULL;
2037 local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
2038 (*rl_redisplay_function) ();
2042 #else /* !USE_VARARGS */
2044 rl_message (format, arg1, arg2)
2047 sprintf (msg_buf, format, arg1, arg2);
2048 msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */
2050 rl_display_prompt = msg_buf;
2051 if (saved_local_prompt == 0)
2054 msg_saved_prompt = 1;
2056 local_prompt = expand_prompt (msg_buf, &prompt_visible_length,
2057 &prompt_last_invisible,
2058 &prompt_invis_chars_first_line,
2059 &prompt_physical_chars);
2060 local_prompt_prefix = (char *)NULL;
2061 local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
2062 (*rl_redisplay_function) ();
2066 #endif /* !USE_VARARGS */
2068 /* How to clear things from the "echo-area". */
2072 rl_display_prompt = rl_prompt;
2073 if (msg_saved_prompt)
2075 rl_restore_prompt ();
2076 msg_saved_prompt = 0;
2078 (*rl_redisplay_function) ();
2083 rl_reset_line_state ()
2087 rl_display_prompt = rl_prompt ? rl_prompt : "";
2095 saved_local_prompt = local_prompt;
2096 saved_local_prefix = local_prompt_prefix;
2097 saved_prefix_length = prompt_prefix_length;
2098 saved_local_length = local_prompt_len;
2099 saved_last_invisible = prompt_last_invisible;
2100 saved_visible_length = prompt_visible_length;
2101 saved_invis_chars_first_line = prompt_invis_chars_first_line;
2102 saved_physical_chars = prompt_physical_chars;
2104 local_prompt = local_prompt_prefix = (char *)0;
2105 local_prompt_len = 0;
2106 prompt_last_invisible = prompt_visible_length = prompt_prefix_length = 0;
2107 prompt_invis_chars_first_line = prompt_physical_chars = 0;
2111 rl_restore_prompt ()
2113 FREE (local_prompt);
2114 FREE (local_prompt_prefix);
2116 local_prompt = saved_local_prompt;
2117 local_prompt_prefix = saved_local_prefix;
2118 local_prompt_len = saved_local_length;
2119 prompt_prefix_length = saved_prefix_length;
2120 prompt_last_invisible = saved_last_invisible;
2121 prompt_visible_length = saved_visible_length;
2122 prompt_invis_chars_first_line = saved_invis_chars_first_line;
2123 prompt_physical_chars = saved_physical_chars;
2125 /* can test saved_local_prompt to see if prompt info has been saved. */
2126 saved_local_prompt = saved_local_prefix = (char *)0;
2127 saved_local_length = 0;
2128 saved_last_invisible = saved_visible_length = saved_prefix_length = 0;
2129 saved_invis_chars_first_line = saved_physical_chars = 0;
2133 _rl_make_prompt_for_search (pchar)
2141 /* We've saved the prompt, and can do anything with the various prompt
2142 strings we need before they're restored. We want the unexpanded
2143 portion of the prompt string after any final newline. */
2144 p = rl_prompt ? strrchr (rl_prompt, '\n') : 0;
2147 len = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0;
2148 pmt = (char *)xmalloc (len + 2);
2150 strcpy (pmt, rl_prompt);
2158 pmt = (char *)xmalloc (len + 2);
2165 /* will be overwritten by expand_prompt, called from rl_message */
2166 prompt_physical_chars = saved_physical_chars + 1;
2170 /* Quick redisplay hack when erasing characters at the end of the line. */
2172 _rl_erase_at_end_of_line (l)
2178 for (i = 0; i < l; i++)
2179 putc (' ', rl_outstream);
2181 for (i = 0; i < l; i++)
2182 visible_line[--_rl_last_c_pos] = '\0';
2186 /* Clear to the end of the line. COUNT is the minimum
2187 number of character spaces to clear, */
2189 _rl_clear_to_eol (count)
2192 if (_rl_term_clreol)
2193 tputs (_rl_term_clreol, 1, _rl_output_character_function);
2195 space_to_eol (count);
2198 /* Clear to the end of the line using spaces. COUNT is the minimum
2199 number of character spaces to clear, */
2201 space_to_eol (count)
2206 for (i = 0; i < count; i++)
2207 putc (' ', rl_outstream);
2209 _rl_last_c_pos += count;
2215 if (_rl_term_clrpag)
2216 tputs (_rl_term_clrpag, 1, _rl_output_character_function);
2221 /* Insert COUNT characters from STRING to the output stream at column COL. */
2223 insert_some_chars (string, count, col)
2227 #if defined (__MSDOS__) || defined (__MINGW32__)
2228 _rl_output_some_chars (string, count);
2231 if (MB_CUR_MAX == 1 || rl_byte_oriented)
2233 fprintf(stderr, "readline: debug: insert_some_chars: count (%d) != col (%d)\n", count, col);
2235 /* If IC is defined, then we do not have to "enter" insert mode. */
2240 buffer = tgoto (_rl_term_IC, 0, col);
2241 tputs (buffer, 1, _rl_output_character_function);
2242 _rl_output_some_chars (string, count);
2248 /* If we have to turn on insert-mode, then do so. */
2249 if (_rl_term_im && *_rl_term_im)
2250 tputs (_rl_term_im, 1, _rl_output_character_function);
2252 /* If there is a special command for inserting characters, then
2253 use that first to open up the space. */
2254 if (_rl_term_ic && *_rl_term_ic)
2256 for (i = col; i--; )
2257 tputs (_rl_term_ic, 1, _rl_output_character_function);
2260 /* Print the text. */
2261 _rl_output_some_chars (string, count);
2263 /* If there is a string to turn off insert mode, we had best use
2265 if (_rl_term_ei && *_rl_term_ei)
2266 tputs (_rl_term_ei, 1, _rl_output_character_function);
2268 #endif /* __MSDOS__ || __MINGW32__ */
2271 /* Delete COUNT characters from the display line. */
2273 delete_chars (count)
2276 if (count > _rl_screenwidth) /* XXX */
2279 #if !defined (__MSDOS__) && !defined (__MINGW32__)
2280 if (_rl_term_DC && *_rl_term_DC)
2283 buffer = tgoto (_rl_term_DC, count, count);
2284 tputs (buffer, count, _rl_output_character_function);
2288 if (_rl_term_dc && *_rl_term_dc)
2290 tputs (_rl_term_dc, 1, _rl_output_character_function);
2292 #endif /* !__MSDOS__ && !__MINGW32__ */
2301 /* If the cursor is the only thing on an otherwise-blank last line,
2302 compensate so we don't print an extra CRLF. */
2303 if (_rl_vis_botlin && _rl_last_c_pos == 0 &&
2304 visible_line[vis_lbreaks[_rl_vis_botlin]] == 0)
2309 _rl_move_vert (_rl_vis_botlin);
2310 /* If we've wrapped lines, remove the final xterm line-wrap flag. */
2311 if (full_lines && _rl_term_autowrap && (VIS_LLEN(_rl_vis_botlin) == _rl_screenwidth))
2315 last_line = &visible_line[vis_lbreaks[_rl_vis_botlin]];
2316 cpos_buffer_position = -1; /* don't know where we are in buffer */
2317 _rl_move_cursor_relative (_rl_screenwidth - 1, last_line); /* XXX */
2318 _rl_clear_to_eol (0);
2319 putc (last_line[_rl_screenwidth - 1], rl_outstream);
2323 fflush (rl_outstream);
2327 /* Move to the start of the current line. */
2333 #if defined (__MSDOS__)
2334 putc ('\r', rl_outstream);
2336 tputs (_rl_term_cr, 1, _rl_output_character_function);
2342 /* Redraw the last line of a multi-line prompt that may possibly contain
2343 terminal escape sequences. Called with the cursor at column 0 of the
2344 line to draw the prompt on. */
2351 oldp = rl_display_prompt;
2354 rl_display_prompt = t;
2355 local_prompt = expand_prompt (t, &prompt_visible_length,
2356 &prompt_last_invisible,
2357 &prompt_invis_chars_first_line,
2358 &prompt_physical_chars);
2359 local_prompt_prefix = (char *)NULL;
2360 local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
2362 rl_forced_update_display ();
2364 rl_display_prompt = oldp;
2365 rl_restore_prompt();
2368 /* Redisplay the current line after a SIGWINCH is received. */
2370 _rl_redisplay_after_sigwinch ()
2374 /* Clear the current line and put the cursor at column 0. Make sure
2375 the right thing happens if we have wrapped to a new screen line. */
2378 #if defined (__MSDOS__)
2379 putc ('\r', rl_outstream);
2381 tputs (_rl_term_cr, 1, _rl_output_character_function);
2384 #if defined (__MSDOS__)
2385 space_to_eol (_rl_screenwidth);
2386 putc ('\r', rl_outstream);
2388 if (_rl_term_clreol)
2389 tputs (_rl_term_clreol, 1, _rl_output_character_function);
2392 space_to_eol (_rl_screenwidth);
2393 tputs (_rl_term_cr, 1, _rl_output_character_function);
2396 if (_rl_last_v_pos > 0)
2402 /* Redraw only the last line of a multi-line prompt. */
2403 t = strrchr (rl_display_prompt, '\n');
2405 redraw_prompt (++t);
2407 rl_forced_update_display ();
2411 _rl_clean_up_for_exit ()
2413 if (readline_echoing_p)
2415 _rl_move_vert (_rl_vis_botlin);
2417 fflush (rl_outstream);
2418 rl_restart_output (1, 0);
2423 _rl_erase_entire_line ()
2426 _rl_clear_to_eol (0);
2428 fflush (rl_outstream);
2431 /* return the `current display line' of the cursor -- the number of lines to
2432 move up to get to the first screen line of the current readline line. */
2434 _rl_current_display_line ()
2438 /* Find out whether or not there might be invisible characters in the
2440 if (rl_display_prompt == rl_prompt)
2441 nleft = _rl_last_c_pos - _rl_screenwidth - rl_visible_prompt_length;
2443 nleft = _rl_last_c_pos - _rl_screenwidth;
2446 ret = 1 + nleft / _rl_screenwidth;
2453 #if defined (HANDLE_MULTIBYTE)
2454 /* Calculate the number of screen columns occupied by STR from START to END.
2455 In the case of multibyte characters with stateful encoding, we have to
2456 scan from the beginning of the string to take the state into account. */
2458 _rl_col_width (str, start, end)
2464 int tmp, point, width, max;
2468 if (MB_CUR_MAX == 1 || rl_byte_oriented)
2469 return (end - start);
2471 memset (&ps, 0, sizeof (mbstate_t));
2476 while (point < start)
2478 tmp = mbrlen (str + point, max, &ps);
2479 if (MB_INVALIDCH ((size_t)tmp))
2481 /* In this case, the bytes are invalid or too short to compose a
2482 multibyte character, so we assume that the first byte represents
2483 a single character. */
2487 /* Clear the state of the byte sequence, because in this case the
2488 effect of mbstate is undefined. */
2489 memset (&ps, 0, sizeof (mbstate_t));
2491 else if (MB_NULLWCH (tmp))
2492 break; /* Found '\0' */
2500 /* If START is not a byte that starts a character, then POINT will be
2501 greater than START. In this case, assume that (POINT - START) gives
2502 a byte count that is the number of columns of difference. */
2503 width = point - start;
2507 tmp = mbrtowc (&wc, str + point, max, &ps);
2508 if (MB_INVALIDCH ((size_t)tmp))
2510 /* In this case, the bytes are invalid or too short to compose a
2511 multibyte character, so we assume that the first byte represents
2512 a single character. */
2516 /* and assume that the byte occupies a single column. */
2519 /* Clear the state of the byte sequence, because in this case the
2520 effect of mbstate is undefined. */
2521 memset (&ps, 0, sizeof (mbstate_t));
2523 else if (MB_NULLWCH (tmp))
2524 break; /* Found '\0' */
2530 width += (tmp >= 0) ? tmp : 1;
2534 width += point - end;
2538 #endif /* HANDLE_MULTIBYTE */