1 /* display.c -- readline redisplay facility. */
3 /* Copyright (C) 1987-2006 Free Software Foundation, Inc.
5 This file is part of the GNU Readline Library, a library for
6 reading lines of text with interactive input and history editing.
8 The GNU Readline Library is free software; you can redistribute it
9 and/or modify it under the terms of the GNU General Public License
10 as published by the Free Software Foundation; either version 2, or
11 (at your option) any later version.
13 The GNU Readline Library is distributed in the hope that it will be
14 useful, but WITHOUT ANY WARRANTY; without even the implied warranty
15 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 The GNU General Public License is often shipped with GNU software, and
19 is generally kept in a file called COPYING or LICENSE. If you do not
20 have a copy of the license, write to the Free Software Foundation,
21 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
22 #define READLINE_LIBRARY
24 #if defined (HAVE_CONFIG_H)
28 #include <sys/types.h>
30 #if defined (HAVE_UNISTD_H)
32 #endif /* HAVE_UNISTD_H */
34 #include "posixstat.h"
36 #if defined (HAVE_STDLIB_H)
39 # include "ansi_stdlib.h"
40 #endif /* HAVE_STDLIB_H */
44 /* System-specific feature definitions and include files. */
48 /* Termcap library stuff. */
51 /* Some standard library routines. */
55 #include "rlprivate.h"
58 #if !defined (strchr) && !defined (__STDC__)
59 extern char *strchr (), *strrchr ();
60 #endif /* !strchr && !__STDC__ */
62 static void update_line PARAMS((char *, char *, int, int, int, int));
63 static void space_to_eol PARAMS((int));
64 static void delete_chars PARAMS((int));
65 static void insert_some_chars PARAMS((char *, int, int));
66 static void cr PARAMS((void));
68 #if defined (HANDLE_MULTIBYTE)
69 static int _rl_col_width PARAMS((const char *, int, int));
70 static int *_rl_wrapped_line;
72 # define _rl_col_width(l, s, e) (((e) <= (s)) ? 0 : (e) - (s))
75 static int *inv_lbreaks, *vis_lbreaks;
76 static int inv_lbsize, vis_lbsize;
78 /* Heuristic used to decide whether it is faster to move from CUR to NEW
79 by backing up or outputting a carriage return and moving forward. CUR
80 and NEW are either both buffer positions or absolute screen positions. */
81 #define CR_FASTER(new, cur) (((new) + 1) < ((cur) - (new)))
83 /* _rl_last_c_pos is an absolute cursor position in multibyte locales and a
84 buffer index in others. This macro is used when deciding whether the
85 current cursor position is in the middle of a prompt string containing
86 invisible characters. */
87 #define PROMPT_ENDING_INDEX \
88 ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) ? prompt_physical_chars : prompt_last_invisible+1)
91 /* **************************************************************** */
95 /* **************************************************************** */
97 /* This is the stuff that is hard for me. I never seem to write good
98 display routines in C. Let's see how I do this time. */
100 /* (PWP) Well... Good for a simple line updater, but totally ignores
101 the problems of input lines longer than the screen width.
103 update_line and the code that calls it makes a multiple line,
104 automatically wrapping line update. Careful attention needs
105 to be paid to the vertical position variables. */
107 /* Keep two buffers; one which reflects the current contents of the
108 screen, and the other to draw what we think the new contents should
109 be. Then compare the buffers, and make whatever changes to the
110 screen itself that we should. Finally, make the buffer that we
111 just drew into be the one which reflects the current contents of the
112 screen, and place the cursor where it belongs.
114 Commands that want to can fix the display themselves, and then let
115 this function know that the display has been fixed by setting the
116 RL_DISPLAY_FIXED variable. This is good for efficiency. */
118 /* Application-specific redisplay function. */
119 rl_voidfunc_t *rl_redisplay_function = rl_redisplay;
121 /* Global variables declared here. */
122 /* What YOU turn on when you have handled all redisplay yourself. */
123 int rl_display_fixed = 0;
125 int _rl_suppress_redisplay = 0;
126 int _rl_want_redisplay = 0;
128 /* The stuff that gets printed out before the actual text of the line.
129 This is usually pointing to rl_prompt. */
130 char *rl_display_prompt = (char *)NULL;
132 /* Pseudo-global variables declared here. */
134 /* The visible cursor position. If you print some text, adjust this. */
135 /* NOTE: _rl_last_c_pos is used as a buffer index when not in a locale
136 supporting multibyte characters, and an absolute cursor position when
137 in such a locale. This is an artifact of the donated multibyte support.
138 Care must be taken when modifying its value. */
139 int _rl_last_c_pos = 0;
140 int _rl_last_v_pos = 0;
142 static int cpos_adjusted;
143 static int cpos_buffer_position;
145 /* Number of lines currently on screen minus 1. */
146 int _rl_vis_botlin = 0;
148 /* Variables used only in this file. */
149 /* The last left edge of text that was displayed. This is used when
150 doing horizontal scrolling. It shifts in thirds of a screenwidth. */
151 static int last_lmargin;
153 /* The line display buffers. One is the line currently displayed on
154 the screen. The other is the line about to be displayed. */
155 static char *visible_line = (char *)NULL;
156 static char *invisible_line = (char *)NULL;
158 /* A buffer for `modeline' messages. */
159 static char msg_buf[128];
161 /* Non-zero forces the redisplay even if we thought it was unnecessary. */
162 static int forced_display;
164 /* Default and initial buffer size. Can grow. */
165 static int line_size = 1024;
167 /* Variables to keep track of the expanded prompt string, which may
168 include invisible characters. */
170 static char *local_prompt, *local_prompt_prefix;
171 static int local_prompt_len;
172 static int prompt_visible_length, prompt_prefix_length;
174 /* The number of invisible characters in the line currently being
175 displayed on the screen. */
176 static int visible_wrap_offset;
178 /* The number of invisible characters in the prompt string. Static so it
179 can be shared between rl_redisplay and update_line */
180 static int wrap_offset;
182 /* The index of the last invisible character in the prompt string. */
183 static int prompt_last_invisible;
185 /* The length (buffer offset) of the first line of the last (possibly
186 multi-line) buffer displayed on the screen. */
187 static int visible_first_line_len;
189 /* Number of invisible characters on the first physical line of the prompt.
190 Only valid when the number of physical characters in the prompt exceeds
191 (or is equal to) _rl_screenwidth. */
192 static int prompt_invis_chars_first_line;
194 static int prompt_last_screen_line;
196 static int prompt_physical_chars;
198 /* Variables to save and restore prompt and display information. */
200 /* These are getting numerous enough that it's time to create a struct. */
202 static char *saved_local_prompt;
203 static char *saved_local_prefix;
204 static int saved_last_invisible;
205 static int saved_visible_length;
206 static int saved_prefix_length;
207 static int saved_local_length;
208 static int saved_invis_chars_first_line;
209 static int saved_physical_chars;
211 /* Expand the prompt string S and return the number of visible
212 characters in *LP, if LP is not null. This is currently more-or-less
213 a placeholder for expansion. LIP, if non-null is a place to store the
214 index of the last invisible character in the returned string. NIFLP,
215 if non-zero, is a place to store the number of invisible characters in
216 the first prompt line. The previous are used as byte counts -- indexes
217 into a character buffer. */
219 /* Current implementation:
220 \001 (^A) start non-visible characters
221 \002 (^B) end non-visible characters
222 all characters except \001 and \002 (following a \001) are copied to
223 the returned string; all characters except those between \001 and
224 \002 are assumed to be `visible'. */
227 expand_prompt (pmt, lp, lip, niflp, vlp)
229 int *lp, *lip, *niflp, *vlp;
231 char *r, *ret, *p, *igstart;
232 int l, rl, last, ignoring, ninvis, invfl, invflset, ind, pind, physchars;
234 /* Short-circuit if we can. */
235 if ((MB_CUR_MAX <= 1 || rl_byte_oriented) && strchr (pmt, RL_PROMPT_START_IGNORE) == 0)
237 r = savestring (pmt);
245 *vlp = lp ? *lp : strlen (r);
250 r = ret = (char *)xmalloc (l + 1);
252 invfl = 0; /* invisible chars in first line of prompt */
253 invflset = 0; /* we only want to set invfl once */
256 for (rl = ignoring = last = ninvis = physchars = 0, p = pmt; p && *p; p++)
258 /* This code strips the invisible character string markers
259 RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */
260 if (ignoring == 0 && *p == RL_PROMPT_START_IGNORE) /* XXX - check ignoring? */
266 else if (ignoring && *p == RL_PROMPT_END_IGNORE)
269 if (p != (igstart + 1))
275 #if defined (HANDLE_MULTIBYTE)
276 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
279 ind = _rl_find_next_mbchar (pmt, pind, 1, MB_FIND_NONZERO);
286 physchars += _rl_col_width (pmt, pind, ind);
289 ninvis += ind - pind;
290 p--; /* compensate for later increment */
298 rl++; /* visible length byte counter */
302 ninvis++; /* invisible chars byte counter */
305 if (invflset == 0 && rl >= _rl_screenwidth)
313 if (rl < _rl_screenwidth)
328 /* Just strip out RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE from
329 PMT and return the rest of PMT. */
331 _rl_strip_prompt (pmt)
336 ret = expand_prompt (pmt, (int *)NULL, (int *)NULL, (int *)NULL, (int *)NULL);
341 * Expand the prompt string into the various display components, if
344 * local_prompt = expanded last line of string in rl_display_prompt
345 * (portion after the final newline)
346 * local_prompt_prefix = portion before last newline of rl_display_prompt,
347 * expanded via expand_prompt
348 * prompt_visible_length = number of visible characters in local_prompt
349 * prompt_prefix_length = number of visible characters in local_prompt_prefix
351 * This function is called once per call to readline(). It may also be
352 * called arbitrarily to expand the primary prompt.
354 * The return value is the number of visible characters on the last line
355 * of the (possibly multi-line) prompt.
358 rl_expand_prompt (prompt)
364 /* Clear out any saved values. */
366 FREE (local_prompt_prefix);
368 local_prompt = local_prompt_prefix = (char *)0;
369 local_prompt_len = 0;
370 prompt_last_invisible = prompt_invis_chars_first_line = 0;
371 prompt_visible_length = prompt_physical_chars = 0;
373 if (prompt == 0 || *prompt == 0)
376 p = strrchr (prompt, '\n');
379 /* The prompt is only one logical line, though it might wrap. */
380 local_prompt = expand_prompt (prompt, &prompt_visible_length,
381 &prompt_last_invisible,
382 &prompt_invis_chars_first_line,
383 &prompt_physical_chars);
384 local_prompt_prefix = (char *)0;
385 local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
386 return (prompt_visible_length);
390 /* The prompt spans multiple lines. */
392 local_prompt = expand_prompt (p, &prompt_visible_length,
393 &prompt_last_invisible,
394 &prompt_invis_chars_first_line,
395 &prompt_physical_chars);
397 /* The portion of the prompt string up to and including the
398 final newline is now null-terminated. */
399 local_prompt_prefix = expand_prompt (prompt, &prompt_prefix_length,
404 local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
405 return (prompt_prefix_length);
409 /* Initialize the VISIBLE_LINE and INVISIBLE_LINE arrays, and their associated
410 arrays of line break markers. MINSIZE is the minimum size of VISIBLE_LINE
411 and INVISIBLE_LINE; if it is greater than LINE_SIZE, LINE_SIZE is
412 increased. If the lines have already been allocated, this ensures that
413 they can hold at least MINSIZE characters. */
415 init_line_structures (minsize)
420 if (invisible_line == 0) /* initialize it */
422 if (line_size < minsize)
424 visible_line = (char *)xmalloc (line_size);
425 invisible_line = (char *)xmalloc (line_size);
427 else if (line_size < minsize) /* ensure it can hold MINSIZE chars */
430 if (line_size < minsize)
432 visible_line = (char *)xrealloc (visible_line, line_size);
433 invisible_line = (char *)xrealloc (invisible_line, line_size);
436 for (n = minsize; n < line_size; n++)
439 invisible_line[n] = 1;
442 if (vis_lbreaks == 0)
444 /* should be enough. */
445 inv_lbsize = vis_lbsize = 256;
446 inv_lbreaks = (int *)xmalloc (inv_lbsize * sizeof (int));
447 vis_lbreaks = (int *)xmalloc (vis_lbsize * sizeof (int));
448 #if defined (HANDLE_MULTIBYTE)
449 _rl_wrapped_line = (int *)xmalloc (vis_lbsize * sizeof (int));
451 inv_lbreaks[0] = vis_lbreaks[0] = 0;
455 /* Basic redisplay algorithm. */
459 register int in, out, c, linenum, cursor_linenum;
461 int inv_botlin, lb_botlin, lb_linenum, o_cpos;
462 int newlines, lpos, temp, modmark, n0, num;
463 char *prompt_this_line;
464 #if defined (HANDLE_MULTIBYTE)
469 int _rl_wrapped_multicolumn = 0;
472 if (!readline_echoing_p)
475 if (!rl_display_prompt)
476 rl_display_prompt = "";
478 if (invisible_line == 0 || vis_lbreaks == 0)
480 init_line_structures (0);
484 /* Draw the line into the buffer. */
485 cpos_buffer_position = -1;
487 line = invisible_line;
488 out = inv_botlin = 0;
490 /* Mark the line as modified or not. We only do this for history
493 if (_rl_mark_modified_lines && current_history () && rl_undo_list)
500 /* If someone thought that the redisplay was handled, but the currently
501 visible line has a different modification state than the one about
502 to become visible, then correct the caller's misconception. */
503 if (visible_line[0] != invisible_line[0])
504 rl_display_fixed = 0;
506 /* If the prompt to be displayed is the `primary' readline prompt (the
507 one passed to readline()), use the values we have already expanded.
508 If not, use what's already in rl_display_prompt. WRAP_OFFSET is the
509 number of non-visible characters in the prompt string. */
510 if (rl_display_prompt == rl_prompt || local_prompt)
512 if (local_prompt_prefix && forced_display)
513 _rl_output_some_chars (local_prompt_prefix, strlen (local_prompt_prefix));
515 if (local_prompt_len > 0)
517 temp = local_prompt_len + out + 2;
518 if (temp >= line_size)
520 line_size = (temp + 1024) - (temp % 1024);
521 visible_line = (char *)xrealloc (visible_line, line_size);
522 line = invisible_line = (char *)xrealloc (invisible_line, line_size);
524 strncpy (line + out, local_prompt, local_prompt_len);
525 out += local_prompt_len;
528 wrap_offset = local_prompt_len - prompt_visible_length;
533 prompt_this_line = strrchr (rl_display_prompt, '\n');
534 if (!prompt_this_line)
535 prompt_this_line = rl_display_prompt;
539 pmtlen = prompt_this_line - rl_display_prompt; /* temp var */
542 _rl_output_some_chars (rl_display_prompt, pmtlen);
543 /* Make sure we are at column zero even after a newline,
544 regardless of the state of terminal output processing. */
545 if (pmtlen < 2 || prompt_this_line[-2] != '\r')
550 prompt_physical_chars = pmtlen = strlen (prompt_this_line);
551 temp = pmtlen + out + 2;
552 if (temp >= line_size)
554 line_size = (temp + 1024) - (temp % 1024);
555 visible_line = (char *)xrealloc (visible_line, line_size);
556 line = invisible_line = (char *)xrealloc (invisible_line, line_size);
558 strncpy (line + out, prompt_this_line, pmtlen);
561 wrap_offset = prompt_invis_chars_first_line = 0;
564 #if defined (HANDLE_MULTIBYTE)
565 #define CHECK_INV_LBREAKS() \
567 if (newlines >= (inv_lbsize - 2)) \
570 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
571 _rl_wrapped_line = (int *)xrealloc (_rl_wrapped_line, inv_lbsize * sizeof (int)); \
575 #define CHECK_INV_LBREAKS() \
577 if (newlines >= (inv_lbsize - 2)) \
580 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
583 #endif /* HANDLE_MULTIBYTE */
585 #if defined (HANDLE_MULTIBYTE)
586 #define CHECK_LPOS() \
589 if (lpos >= _rl_screenwidth) \
591 if (newlines >= (inv_lbsize - 2)) \
594 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
595 _rl_wrapped_line = (int *)xrealloc (_rl_wrapped_line, inv_lbsize * sizeof (int)); \
597 inv_lbreaks[++newlines] = out; \
598 _rl_wrapped_line[newlines] = _rl_wrapped_multicolumn; \
603 #define CHECK_LPOS() \
606 if (lpos >= _rl_screenwidth) \
608 if (newlines >= (inv_lbsize - 2)) \
611 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
613 inv_lbreaks[++newlines] = out; \
619 /* inv_lbreaks[i] is where line i starts in the buffer. */
620 inv_lbreaks[newlines = 0] = 0;
622 lpos = out - wrap_offset;
624 lpos = prompt_physical_chars + modmark;
627 #if defined (HANDLE_MULTIBYTE)
628 memset (_rl_wrapped_line, 0, vis_lbsize);
632 /* prompt_invis_chars_first_line is the number of invisible characters in
633 the first physical line of the prompt.
634 wrap_offset - prompt_invis_chars_first_line is the number of invis
635 chars on the second line. */
637 /* what if lpos is already >= _rl_screenwidth before we start drawing the
638 contents of the command line? */
639 while (lpos >= _rl_screenwidth)
642 /* fix from Darin Johnson <darin@acuson.com> for prompt string with
643 invisible characters that is longer than the screen width. The
644 prompt_invis_chars_first_line variable could be made into an array
645 saying how many invisible characters there are per line, but that's
646 probably too much work for the benefit gained. How many people have
647 prompts that exceed two physical lines?
648 Additional logic fix from Edward Catmur <ed@catmur.co.uk> */
649 #if defined (HANDLE_MULTIBYTE)
650 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
653 temp = local_prompt_len;
656 z = _rl_col_width (local_prompt, n0, num);
657 if (z > _rl_screenwidth)
659 num = _rl_find_prev_mbchar (local_prompt, num, MB_FIND_ANY);
662 else if (z == _rl_screenwidth)
669 #endif /* !HANDLE_MULTIBYTE */
670 temp = ((newlines + 1) * _rl_screenwidth);
672 /* Now account for invisible characters in the current line. */
673 temp += ((local_prompt_prefix == 0) ? ((newlines == 0) ? prompt_invis_chars_first_line
674 : ((newlines == 1) ? wrap_offset : 0))
675 : ((newlines == 0) ? wrap_offset :0));
677 inv_lbreaks[++newlines] = temp;
678 #if defined (HANDLE_MULTIBYTE)
679 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
680 lpos -= _rl_col_width (local_prompt, n0, num);
683 lpos -= _rl_screenwidth;
686 prompt_last_screen_line = newlines;
688 /* Draw the rest of the line (after the prompt) into invisible_line, keeping
689 track of where the cursor is (cpos_buffer_position), the number of the line containing
690 the cursor (lb_linenum), the last line number (lb_botlin and inv_botlin).
691 It maintains an array of line breaks for display (inv_lbreaks).
692 This handles expanding tabs for display and displaying meta characters. */
694 #if defined (HANDLE_MULTIBYTE)
696 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
698 memset (&ps, 0, sizeof (mbstate_t));
699 wc_bytes = mbrtowc (&wc, rl_line_buffer, rl_end, &ps);
705 for (in = 0; in < rl_end; in++)
708 c = (unsigned char)rl_line_buffer[in];
710 #if defined (HANDLE_MULTIBYTE)
711 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
713 if (MB_INVALIDCH (wc_bytes))
715 /* Byte sequence is invalid or shortened. Assume that the
716 first byte represents a character. */
718 /* Assume that a character occupies a single column. */
720 memset (&ps, 0, sizeof (mbstate_t));
722 else if (MB_NULLWCH (wc_bytes))
723 break; /* Found '\0' */
727 wc_width = (temp >= 0) ? temp : 1;
732 if (out + 8 >= line_size) /* XXX - 8 for \t */
735 visible_line = (char *)xrealloc (visible_line, line_size);
736 invisible_line = (char *)xrealloc (invisible_line, line_size);
737 line = invisible_line;
742 cpos_buffer_position = out;
743 lb_linenum = newlines;
746 #if defined (HANDLE_MULTIBYTE)
747 if (META_CHAR (c) && _rl_output_meta_chars == 0) /* XXX - clean up */
752 if (_rl_output_meta_chars == 0)
754 sprintf (line + out, "\\%o", c);
756 if (lpos + 4 >= _rl_screenwidth)
758 temp = _rl_screenwidth - lpos;
759 CHECK_INV_LBREAKS ();
760 inv_lbreaks[++newlines] = out + temp;
774 #if defined (DISPLAY_TABS)
780 newout = (out | (int)7) + 1;
782 newout = out + 8 - lpos % 8;
785 if (lpos + temp >= _rl_screenwidth)
788 temp2 = _rl_screenwidth - lpos;
789 CHECK_INV_LBREAKS ();
790 inv_lbreaks[++newlines] = out + temp2;
803 else if (c == '\n' && _rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up)
805 line[out++] = '\0'; /* XXX - sentinel */
806 CHECK_INV_LBREAKS ();
807 inv_lbreaks[++newlines] = out;
810 else if (CTRL_CHAR (c) || c == RUBOUT)
814 line[out++] = CTRL_CHAR (c) ? UNCTRL (c) : '?';
819 #if defined (HANDLE_MULTIBYTE)
820 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
824 _rl_wrapped_multicolumn = 0;
826 if (_rl_screenwidth < lpos + wc_width)
827 for (i = lpos; i < _rl_screenwidth; i++)
829 /* The space will be removed in update_line() */
831 _rl_wrapped_multicolumn++;
836 cpos_buffer_position = out;
837 lb_linenum = newlines;
839 for (i = in; i < in+wc_bytes; i++)
840 line[out++] = rl_line_buffer[i];
841 for (i = 0; i < wc_width; i++)
855 #if defined (HANDLE_MULTIBYTE)
856 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
859 wc_bytes = mbrtowc (&wc, rl_line_buffer + in, rl_end - in, &ps);
867 if (cpos_buffer_position < 0)
869 cpos_buffer_position = out;
870 lb_linenum = newlines;
873 inv_botlin = lb_botlin = newlines;
874 CHECK_INV_LBREAKS ();
875 inv_lbreaks[newlines+1] = out;
876 cursor_linenum = lb_linenum;
878 /* CPOS_BUFFER_POSITION == position in buffer where cursor should be placed.
879 CURSOR_LINENUM == line number where the cursor should be placed. */
881 /* PWP: now is when things get a bit hairy. The visible and invisible
882 line buffers are really multiple lines, which would wrap every
883 (screenwidth - 1) characters. Go through each in turn, finding
884 the changed region and updating it. The line order is top to bottom. */
886 /* If we can move the cursor up and down, then use multiple lines,
887 otherwise, let long lines display in a single terminal line, and
888 horizontally scroll it. */
890 if (_rl_horizontal_scroll_mode == 0 && _rl_term_up && *_rl_term_up)
892 int nleft, pos, changed_screen_line, tx;
894 if (!rl_display_fixed || forced_display)
898 /* If we have more than a screenful of material to display, then
899 only display a screenful. We should display the last screen,
901 if (out >= _rl_screenchars)
903 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
904 out = _rl_find_prev_mbchar (line, _rl_screenchars, MB_FIND_ANY);
906 out = _rl_screenchars - 1;
909 /* The first line is at character position 0 in the buffer. The
910 second and subsequent lines start at inv_lbreaks[N], offset by
911 OFFSET (which has already been calculated above). */
913 #define INVIS_FIRST() (prompt_physical_chars > _rl_screenwidth ? prompt_invis_chars_first_line : wrap_offset)
914 #define WRAP_OFFSET(line, offset) ((line == 0) \
915 ? (offset ? INVIS_FIRST() : 0) \
916 : ((line == prompt_last_screen_line) ? wrap_offset-prompt_invis_chars_first_line : 0))
917 #define W_OFFSET(line, offset) ((line) == 0 ? offset : 0)
918 #define VIS_LLEN(l) ((l) > _rl_vis_botlin ? 0 : (vis_lbreaks[l+1] - vis_lbreaks[l]))
919 #define INV_LLEN(l) (inv_lbreaks[l+1] - inv_lbreaks[l])
920 #define VIS_CHARS(line) (visible_line + vis_lbreaks[line])
921 #define VIS_LINE(line) ((line) > _rl_vis_botlin) ? "" : VIS_CHARS(line)
922 #define INV_LINE(line) (invisible_line + inv_lbreaks[line])
924 /* For each line in the buffer, do the updating display. */
925 for (linenum = 0; linenum <= inv_botlin; linenum++)
927 /* This can lead us astray if we execute a program that changes
928 the locale from a non-multibyte to a multibyte one. */
929 o_cpos = _rl_last_c_pos;
931 update_line (VIS_LINE(linenum), INV_LINE(linenum), linenum,
932 VIS_LLEN(linenum), INV_LLEN(linenum), inv_botlin);
934 /* update_line potentially changes _rl_last_c_pos, but doesn't
935 take invisible characters into account, since _rl_last_c_pos
936 is an absolute cursor position in a multibyte locale. See
937 if compensating here is the right thing, or if we have to
938 change update_line itself. There is one case in which
939 update_line adjusts _rl_last_c_pos itself (so it can pass
940 _rl_move_cursor_relative accurate values); it communicates
941 this back by setting cpos_adjusted. If we assume that
942 _rl_last_c_pos is correct (an absolute cursor position) each
943 time update_line is called, then we can assume in our
944 calculations that o_cpos does not need to be adjusted by
946 if (linenum == 0 && (MB_CUR_MAX > 1 && rl_byte_oriented == 0) &&
947 cpos_adjusted == 0 &&
948 _rl_last_c_pos != o_cpos &&
949 _rl_last_c_pos > wrap_offset &&
950 o_cpos < prompt_last_invisible)
951 _rl_last_c_pos -= prompt_invis_chars_first_line; /* XXX - was wrap_offset */
952 else if (linenum == prompt_last_screen_line && prompt_physical_chars > _rl_screenwidth &&
953 (MB_CUR_MAX > 1 && rl_byte_oriented == 0) &&
954 cpos_adjusted == 0 &&
955 _rl_last_c_pos != o_cpos &&
956 _rl_last_c_pos > (prompt_last_invisible - _rl_screenwidth - prompt_invis_chars_first_line))
957 _rl_last_c_pos -= (wrap_offset-prompt_invis_chars_first_line);
959 /* If this is the line with the prompt, we might need to
960 compensate for invisible characters in the new line. Do
961 this only if there is not more than one new line (which
962 implies that we completely overwrite the old visible line)
963 and the new line is shorter than the old. Make sure we are
964 at the end of the new line before clearing. */
966 inv_botlin == 0 && _rl_last_c_pos == out &&
967 (wrap_offset > visible_wrap_offset) &&
968 (_rl_last_c_pos < visible_first_line_len))
970 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
971 nleft = _rl_screenwidth - _rl_last_c_pos;
973 nleft = _rl_screenwidth + wrap_offset - _rl_last_c_pos;
975 _rl_clear_to_eol (nleft);
978 /* Since the new first line is now visible, save its length. */
980 visible_first_line_len = (inv_botlin > 0) ? inv_lbreaks[1] : out - wrap_offset;
983 /* We may have deleted some lines. If so, clear the left over
984 blank ones at the bottom out. */
985 if (_rl_vis_botlin > inv_botlin)
988 for (; linenum <= _rl_vis_botlin; linenum++)
990 tt = VIS_CHARS (linenum);
991 _rl_move_vert (linenum);
992 _rl_move_cursor_relative (0, tt);
994 ((linenum == _rl_vis_botlin) ? strlen (tt) : _rl_screenwidth);
997 _rl_vis_botlin = inv_botlin;
999 /* CHANGED_SCREEN_LINE is set to 1 if we have moved to a
1000 different screen line during this redisplay. */
1001 changed_screen_line = _rl_last_v_pos != cursor_linenum;
1002 if (changed_screen_line)
1004 _rl_move_vert (cursor_linenum);
1005 /* If we moved up to the line with the prompt using _rl_term_up,
1006 the physical cursor position on the screen stays the same,
1007 but the buffer position needs to be adjusted to account
1008 for invisible characters. */
1009 if ((MB_CUR_MAX == 1 || rl_byte_oriented) && cursor_linenum == 0 && wrap_offset)
1010 _rl_last_c_pos += wrap_offset;
1013 /* We have to reprint the prompt if it contains invisible
1014 characters, since it's not generally OK to just reprint
1015 the characters from the current cursor position. But we
1016 only need to reprint it if the cursor is before the last
1017 invisible character in the prompt string. */
1018 nleft = prompt_visible_length + wrap_offset;
1019 if (cursor_linenum == 0 && wrap_offset > 0 && _rl_last_c_pos > 0 &&
1021 _rl_last_c_pos <= PROMPT_ENDING_INDEX && local_prompt)
1023 _rl_last_c_pos < PROMPT_ENDING_INDEX && local_prompt)
1026 #if defined (__MSDOS__)
1027 putc ('\r', rl_outstream);
1030 tputs (_rl_term_cr, 1, _rl_output_character_function);
1032 _rl_output_some_chars (local_prompt, nleft);
1033 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1034 _rl_last_c_pos = _rl_col_width (local_prompt, 0, nleft) - wrap_offset;
1036 _rl_last_c_pos = nleft;
1039 /* Where on that line? And where does that line start
1041 pos = inv_lbreaks[cursor_linenum];
1042 /* nleft == number of characters in the line buffer between the
1043 start of the line and the desired cursor position. */
1044 nleft = cpos_buffer_position - pos;
1046 /* NLEFT is now a number of characters in a buffer. When in a
1047 multibyte locale, however, _rl_last_c_pos is an absolute cursor
1048 position that doesn't take invisible characters in the prompt
1049 into account. We use a fudge factor to compensate. */
1051 /* Since _rl_backspace() doesn't know about invisible characters in the
1052 prompt, and there's no good way to tell it, we compensate for
1053 those characters here and call _rl_backspace() directly. */
1054 if (wrap_offset && cursor_linenum == 0 && nleft < _rl_last_c_pos)
1056 /* TX == new physical cursor position in multibyte locale. */
1057 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1058 tx = _rl_col_width (&visible_line[pos], 0, nleft) - visible_wrap_offset;
1061 if (tx >= 0 && _rl_last_c_pos > tx)
1063 _rl_backspace (_rl_last_c_pos - tx); /* XXX */
1064 _rl_last_c_pos = tx;
1068 /* We need to note that in a multibyte locale we are dealing with
1069 _rl_last_c_pos as an absolute cursor position, but moving to a
1070 point specified by a buffer position (NLEFT) that doesn't take
1071 invisible characters into account. */
1072 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1073 _rl_move_cursor_relative (nleft, &invisible_line[pos]);
1074 else if (nleft != _rl_last_c_pos)
1075 _rl_move_cursor_relative (nleft, &invisible_line[pos]);
1078 else /* Do horizontal scrolling. */
1080 #define M_OFFSET(margin, offset) ((margin) == 0 ? offset : 0)
1081 int lmargin, ndisp, nleft, phys_c_pos, t;
1083 /* Always at top line. */
1086 /* Compute where in the buffer the displayed line should start. This
1089 /* The number of characters that will be displayed before the cursor. */
1090 ndisp = cpos_buffer_position - wrap_offset;
1091 nleft = prompt_visible_length + wrap_offset;
1092 /* Where the new cursor position will be on the screen. This can be
1093 longer than SCREENWIDTH; if it is, lmargin will be adjusted. */
1094 phys_c_pos = cpos_buffer_position - (last_lmargin ? last_lmargin : wrap_offset);
1095 t = _rl_screenwidth / 3;
1097 /* If the number of characters had already exceeded the screenwidth,
1098 last_lmargin will be > 0. */
1100 /* If the number of characters to be displayed is more than the screen
1101 width, compute the starting offset so that the cursor is about
1102 two-thirds of the way across the screen. */
1103 if (phys_c_pos > _rl_screenwidth - 2)
1105 lmargin = cpos_buffer_position - (2 * t);
1108 /* If the left margin would be in the middle of a prompt with
1109 invisible characters, don't display the prompt at all. */
1110 if (wrap_offset && lmargin > 0 && lmargin < nleft)
1113 else if (ndisp < _rl_screenwidth - 2) /* XXX - was -1 */
1115 else if (phys_c_pos < 1)
1117 /* If we are moving back towards the beginning of the line and
1118 the last margin is no longer correct, compute a new one. */
1119 lmargin = ((cpos_buffer_position - 1) / t) * t; /* XXX */
1120 if (wrap_offset && lmargin > 0 && lmargin < nleft)
1124 lmargin = last_lmargin;
1126 /* If the first character on the screen isn't the first character
1127 in the display line, indicate this with a special character. */
1129 line[lmargin] = '<';
1131 /* If SCREENWIDTH characters starting at LMARGIN do not encompass
1132 the whole line, indicate that with a special character at the
1133 right edge of the screen. If LMARGIN is 0, we need to take the
1134 wrap offset into account. */
1135 t = lmargin + M_OFFSET (lmargin, wrap_offset) + _rl_screenwidth;
1139 if (!rl_display_fixed || forced_display || lmargin != last_lmargin)
1142 update_line (&visible_line[last_lmargin],
1143 &invisible_line[lmargin],
1145 _rl_screenwidth + visible_wrap_offset,
1146 _rl_screenwidth + (lmargin ? 0 : wrap_offset),
1149 /* If the visible new line is shorter than the old, but the number
1150 of invisible characters is greater, and we are at the end of
1151 the new line, we need to clear to eol. */
1152 t = _rl_last_c_pos - M_OFFSET (lmargin, wrap_offset);
1153 if ((M_OFFSET (lmargin, wrap_offset) > visible_wrap_offset) &&
1154 (_rl_last_c_pos == out) &&
1155 t < visible_first_line_len)
1157 nleft = _rl_screenwidth - t;
1158 _rl_clear_to_eol (nleft);
1160 visible_first_line_len = out - lmargin - M_OFFSET (lmargin, wrap_offset);
1161 if (visible_first_line_len > _rl_screenwidth)
1162 visible_first_line_len = _rl_screenwidth;
1164 _rl_move_cursor_relative (cpos_buffer_position - lmargin, &invisible_line[lmargin]);
1165 last_lmargin = lmargin;
1168 fflush (rl_outstream);
1170 /* Swap visible and non-visible lines. */
1172 char *vtemp = visible_line;
1173 int *itemp = vis_lbreaks, ntemp = vis_lbsize;
1175 visible_line = invisible_line;
1176 invisible_line = vtemp;
1178 vis_lbreaks = inv_lbreaks;
1179 inv_lbreaks = itemp;
1181 vis_lbsize = inv_lbsize;
1184 rl_display_fixed = 0;
1185 /* If we are displaying on a single line, and last_lmargin is > 0, we
1186 are not displaying any invisible characters, so set visible_wrap_offset
1188 if (_rl_horizontal_scroll_mode && last_lmargin)
1189 visible_wrap_offset = 0;
1191 visible_wrap_offset = wrap_offset;
1195 /* PWP: update_line() is based on finding the middle difference of each
1196 line on the screen; vis:
1198 /old first difference
1199 /beginning of line | /old last same /old EOL
1201 old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as
1202 new: eddie> Oh, my little buggy says to me, as lurgid as
1204 \beginning of line | \new last same \new end of line
1205 \new first difference
1207 All are character pointers for the sake of speed. Special cases for
1208 no differences, as well as for end of line additions must be handled.
1210 Could be made even smarter, but this works well enough */
1212 update_line (old, new, current_line, omax, nmax, inv_botlin)
1213 register char *old, *new;
1214 int current_line, omax, nmax, inv_botlin;
1216 register char *ofd, *ols, *oe, *nfd, *nls, *ne;
1217 int temp, lendiff, wsatend, od, nd, twidth, o_cpos;
1218 int current_invis_chars;
1219 int col_lendiff, col_temp;
1220 #if defined (HANDLE_MULTIBYTE)
1221 mbstate_t ps_new, ps_old;
1222 int new_offset, old_offset;
1225 /* If we're at the right edge of a terminal that supports xn, we're
1226 ready to wrap around, so do so. This fixes problems with knowing
1227 the exact cursor position and cut-and-paste with certain terminal
1228 emulators. In this calculation, TEMP is the physical screen
1229 position of the cursor. */
1230 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1231 temp = _rl_last_c_pos;
1233 temp = _rl_last_c_pos - WRAP_OFFSET (_rl_last_v_pos, visible_wrap_offset);
1234 if (temp == _rl_screenwidth && _rl_term_autowrap && !_rl_horizontal_scroll_mode
1235 && _rl_last_v_pos == current_line - 1)
1237 #if defined (HANDLE_MULTIBYTE)
1238 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1242 int tempwidth, bytes;
1245 /* This fixes only double-column characters, but if the wrapped
1246 character comsumes more than three columns, spaces will be
1247 inserted in the string buffer. */
1248 if (_rl_wrapped_line[current_line] > 0)
1249 _rl_clear_to_eol (_rl_wrapped_line[current_line]);
1251 memset (&ps, 0, sizeof (mbstate_t));
1252 ret = mbrtowc (&wc, new, MB_CUR_MAX, &ps);
1253 if (MB_INVALIDCH (ret))
1258 else if (MB_NULLWCH (ret))
1261 tempwidth = wcwidth (wc);
1267 for (count = 0; count < bytes; count++)
1268 putc (new[count], rl_outstream);
1269 _rl_last_c_pos = tempwidth;
1271 memset (&ps, 0, sizeof (mbstate_t));
1272 ret = mbrtowc (&wc, old, MB_CUR_MAX, &ps);
1273 if (ret != 0 && bytes != 0)
1275 if (MB_INVALIDCH (ret))
1276 memmove (old+bytes, old+1, strlen (old+1));
1278 memmove (old+bytes, old+ret, strlen (old+ret));
1279 memcpy (old, new, bytes);
1284 putc (' ', rl_outstream);
1287 if (old[0] && new[0])
1295 putc (new[0], rl_outstream);
1297 putc (' ', rl_outstream);
1300 if (old[0] && new[0])
1306 /* Find first difference. */
1307 #if defined (HANDLE_MULTIBYTE)
1308 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1310 /* See if the old line is a subset of the new line, so that the
1311 only change is adding characters. */
1312 temp = (omax < nmax) ? omax : nmax;
1313 if (memcmp (old, new, temp) == 0)
1320 memset (&ps_new, 0, sizeof(mbstate_t));
1321 memset (&ps_old, 0, sizeof(mbstate_t));
1323 if (omax == nmax && STREQN (new, old, omax))
1330 new_offset = old_offset = 0;
1331 for (ofd = old, nfd = new;
1332 (ofd - old < omax) && *ofd &&
1333 _rl_compare_chars(old, old_offset, &ps_old, new, new_offset, &ps_new); )
1335 old_offset = _rl_find_next_mbchar (old, old_offset, 1, MB_FIND_ANY);
1336 new_offset = _rl_find_next_mbchar (new, new_offset, 1, MB_FIND_ANY);
1337 ofd = old + old_offset;
1338 nfd = new + new_offset;
1345 for (ofd = old, nfd = new;
1346 (ofd - old < omax) && *ofd && (*ofd == *nfd);
1350 /* Move to the end of the screen line. ND and OD are used to keep track
1351 of the distance between ne and new and oe and old, respectively, to
1352 move a subtraction out of each loop. */
1353 for (od = ofd - old, oe = ofd; od < omax && *oe; oe++, od++);
1354 for (nd = nfd - new, ne = nfd; nd < nmax && *ne; ne++, nd++);
1356 /* If no difference, continue to next line. */
1357 if (ofd == oe && nfd == ne)
1360 wsatend = 1; /* flag for trailing whitespace */
1362 #if defined (HANDLE_MULTIBYTE)
1363 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1365 ols = old + _rl_find_prev_mbchar (old, oe - old, MB_FIND_ANY);
1366 nls = new + _rl_find_prev_mbchar (new, ne - new, MB_FIND_ANY);
1367 while ((ols > ofd) && (nls > nfd))
1369 memset (&ps_old, 0, sizeof (mbstate_t));
1370 memset (&ps_new, 0, sizeof (mbstate_t));
1373 /* On advice from jir@yamato.ibm.com */
1374 _rl_adjust_point (old, ols - old, &ps_old);
1375 _rl_adjust_point (new, nls - new, &ps_new);
1378 if (_rl_compare_chars (old, ols - old, &ps_old, new, nls - new, &ps_new) == 0)
1384 ols = old + _rl_find_prev_mbchar (old, ols - old, MB_FIND_ANY);
1385 nls = new + _rl_find_prev_mbchar (new, nls - new, MB_FIND_ANY);
1390 #endif /* HANDLE_MULTIBYTE */
1391 ols = oe - 1; /* find last same */
1393 while ((ols > ofd) && (nls > nfd) && (*ols == *nls))
1400 #if defined (HANDLE_MULTIBYTE)
1409 #if defined (HANDLE_MULTIBYTE)
1410 /* This may not work for stateful encoding, but who cares? To handle
1411 stateful encoding properly, we have to scan each string from the
1412 beginning and compare. */
1413 else if (_rl_compare_chars (ols, 0, NULL, nls, 0, NULL) == 0)
1415 else if (*ols != *nls)
1418 if (*ols) /* don't step past the NUL */
1420 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1421 ols = old + _rl_find_next_mbchar (old, ols - old, 1, MB_FIND_ANY);
1427 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1428 nls = new + _rl_find_next_mbchar (new, nls - new, 1, MB_FIND_ANY);
1434 /* count of invisible characters in the current invisible line. */
1435 current_invis_chars = W_OFFSET (current_line, wrap_offset);
1436 if (_rl_last_v_pos != current_line)
1438 _rl_move_vert (current_line);
1439 if ((MB_CUR_MAX == 1 || rl_byte_oriented) && current_line == 0 && visible_wrap_offset)
1440 _rl_last_c_pos += visible_wrap_offset;
1443 /* If this is the first line and there are invisible characters in the
1444 prompt string, and the prompt string has not changed, and the current
1445 cursor position is before the last invisible character in the prompt,
1446 and the index of the character to move to is past the end of the prompt
1447 string, then redraw the entire prompt string. We can only do this
1448 reliably if the terminal supports a `cr' capability.
1450 This is not an efficiency hack -- there is a problem with redrawing
1451 portions of the prompt string if they contain terminal escape
1452 sequences (like drawing the `unbold' sequence without a corresponding
1453 `bold') that manifests itself on certain terminals. */
1455 lendiff = local_prompt_len;
1456 od = ofd - old; /* index of first difference in visible line */
1457 if (current_line == 0 && !_rl_horizontal_scroll_mode &&
1458 _rl_term_cr && lendiff > prompt_visible_length && _rl_last_c_pos > 0 &&
1459 od >= lendiff && _rl_last_c_pos < PROMPT_ENDING_INDEX)
1461 #if defined (__MSDOS__)
1462 putc ('\r', rl_outstream);
1464 tputs (_rl_term_cr, 1, _rl_output_character_function);
1466 _rl_output_some_chars (local_prompt, lendiff);
1467 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1469 /* We take wrap_offset into account here so we can pass correct
1470 information to _rl_move_cursor_relative. */
1471 _rl_last_c_pos = _rl_col_width (local_prompt, 0, lendiff) - wrap_offset;
1475 _rl_last_c_pos = lendiff;
1478 o_cpos = _rl_last_c_pos;
1480 /* When this function returns, _rl_last_c_pos is correct, and an absolute
1481 cursor postion in multibyte mode, but a buffer index when not in a
1482 multibyte locale. */
1483 _rl_move_cursor_relative (od, old);
1485 #if defined (HANDLE_MULTIBYTE)
1486 /* We need to indicate that the cursor position is correct in the presence of
1487 invisible characters in the prompt string. Let's see if setting this when
1488 we make sure we're at the end of the drawn prompt string works. */
1489 if (current_line == 0 && MB_CUR_MAX > 1 && rl_byte_oriented == 0 &&
1490 (_rl_last_c_pos > 0 || o_cpos > 0) &&
1491 _rl_last_c_pos == prompt_physical_chars)
1496 /* if (len (new) > len (old))
1497 lendiff == difference in buffer
1498 col_lendiff == difference on screen
1499 When not using multibyte characters, these are equal */
1500 lendiff = (nls - nfd) - (ols - ofd);
1501 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1502 col_lendiff = _rl_col_width (new, nfd - new, nls - new) - _rl_col_width (old, ofd - old, ols - old);
1504 col_lendiff = lendiff;
1506 /* If we are changing the number of invisible characters in a line, and
1507 the spot of first difference is before the end of the invisible chars,
1508 lendiff needs to be adjusted. */
1509 if (current_line == 0 && !_rl_horizontal_scroll_mode &&
1510 current_invis_chars != visible_wrap_offset)
1512 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1514 lendiff += visible_wrap_offset - current_invis_chars;
1515 col_lendiff += visible_wrap_offset - current_invis_chars;
1519 lendiff += visible_wrap_offset - current_invis_chars;
1520 col_lendiff = lendiff;
1524 /* Insert (diff (len (old), len (new)) ch. */
1526 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1527 col_temp = _rl_col_width (new, nfd - new, ne - new);
1531 if (col_lendiff > 0) /* XXX - was lendiff */
1533 /* Non-zero if we're increasing the number of lines. */
1534 int gl = current_line >= _rl_vis_botlin && inv_botlin > _rl_vis_botlin;
1535 /* If col_lendiff is > 0, implying that the new string takes up more
1536 screen real estate than the old, but lendiff is < 0, meaning that it
1537 takes fewer bytes, we need to just output the characters starting
1538 from the first difference. These will overwrite what is on the
1539 display, so there's no reason to do a smart update. This can really
1540 only happen in a multibyte environment. */
1543 _rl_output_some_chars (nfd, temp);
1544 _rl_last_c_pos += _rl_col_width (nfd, 0, temp);
1545 /* If nfd begins before any invisible characters in the prompt,
1546 adjust _rl_last_c_pos to account for wrap_offset and set
1547 cpos_adjusted to let the caller know. */
1548 if (current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible))
1550 _rl_last_c_pos -= wrap_offset;
1555 /* Sometimes it is cheaper to print the characters rather than
1556 use the terminal's capabilities. If we're growing the number
1557 of lines, make sure we actually cause the new line to wrap
1558 around on auto-wrapping terminals. */
1559 else if (_rl_terminal_can_insert && ((2 * col_temp) >= col_lendiff || _rl_term_IC) && (!_rl_term_autowrap || !gl))
1561 /* If lendiff > prompt_visible_length and _rl_last_c_pos == 0 and
1562 _rl_horizontal_scroll_mode == 1, inserting the characters with
1563 _rl_term_IC or _rl_term_ic will screw up the screen because of the
1564 invisible characters. We need to just draw them. */
1565 if (*ols && (!_rl_horizontal_scroll_mode || _rl_last_c_pos > 0 ||
1566 lendiff <= prompt_visible_length || !current_invis_chars))
1568 insert_some_chars (nfd, lendiff, col_lendiff);
1569 _rl_last_c_pos += col_lendiff;
1571 else if ((MB_CUR_MAX == 1 || rl_byte_oriented != 0) && *ols == 0 && lendiff > 0)
1573 /* At the end of a line the characters do not have to
1574 be "inserted". They can just be placed on the screen. */
1575 /* However, this screws up the rest of this block, which
1576 assumes you've done the insert because you can. */
1577 _rl_output_some_chars (nfd, lendiff);
1578 _rl_last_c_pos += col_lendiff;
1582 _rl_output_some_chars (nfd, temp);
1583 _rl_last_c_pos += col_temp;
1584 /* If nfd begins before any invisible characters in the prompt,
1585 adjust _rl_last_c_pos to account for wrap_offset and set
1586 cpos_adjusted to let the caller know. */
1587 if (current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible))
1589 _rl_last_c_pos -= wrap_offset;
1594 /* Copy (new) chars to screen from first diff to last match. */
1596 if ((temp - lendiff) > 0)
1598 _rl_output_some_chars (nfd + lendiff, temp - lendiff);
1599 /* XXX -- this bears closer inspection. Fixes a redisplay bug
1600 reported against bash-3.0-alpha by Andreas Schwab involving
1601 multibyte characters and prompt strings with invisible
1602 characters, but was previously disabled. */
1603 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1604 twidth = _rl_col_width (nfd+lendiff, 0, temp-col_lendiff);
1606 twidth = temp - lendiff;
1607 _rl_last_c_pos += twidth;
1612 /* cannot insert chars, write to EOL */
1613 _rl_output_some_chars (nfd, temp);
1614 _rl_last_c_pos += col_temp;
1615 /* If we're in a multibyte locale and were before the last invisible
1616 char in the current line (which implies we just output some invisible
1617 characters) we need to adjust _rl_last_c_pos, since it represents
1618 a physical character position. */
1621 else /* Delete characters from line. */
1623 /* If possible and inexpensive to use terminal deletion, then do so. */
1624 if (_rl_term_dc && (2 * col_temp) >= -col_lendiff)
1626 /* If all we're doing is erasing the invisible characters in the
1627 prompt string, don't bother. It screws up the assumptions
1628 about what's on the screen. */
1629 if (_rl_horizontal_scroll_mode && _rl_last_c_pos == 0 &&
1630 -lendiff == visible_wrap_offset)
1634 delete_chars (-col_lendiff); /* delete (diff) characters */
1636 /* Copy (new) chars to screen from first diff to last match */
1640 /* If nfd begins at the prompt, or before the invisible
1641 characters in the prompt, we need to adjust _rl_last_c_pos
1642 in a multibyte locale to account for the wrap offset and
1643 set cpos_adjusted accordingly. */
1644 _rl_output_some_chars (nfd, temp);
1645 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1647 _rl_last_c_pos += _rl_col_width (nfd, 0, temp);
1648 if (current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible))
1650 _rl_last_c_pos -= wrap_offset;
1655 _rl_last_c_pos += temp;
1658 /* Otherwise, print over the existing material. */
1663 /* If nfd begins at the prompt, or before the invisible
1664 characters in the prompt, we need to adjust _rl_last_c_pos
1665 in a multibyte locale to account for the wrap offset and
1666 set cpos_adjusted accordingly. */
1667 _rl_output_some_chars (nfd, temp);
1668 _rl_last_c_pos += col_temp; /* XXX */
1669 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1671 if (current_line == 0 && wrap_offset && ((nfd - new) <= prompt_last_invisible))
1673 _rl_last_c_pos -= wrap_offset;
1678 lendiff = (oe - old) - (ne - new);
1679 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1680 col_lendiff = _rl_col_width (old, 0, oe - old) - _rl_col_width (new, 0, ne - new);
1682 col_lendiff = lendiff;
1686 if (_rl_term_autowrap && current_line < inv_botlin)
1687 space_to_eol (col_lendiff);
1689 _rl_clear_to_eol (col_lendiff);
1695 /* Tell the update routines that we have moved onto a new (empty) line. */
1700 visible_line[0] = '\0';
1702 _rl_last_c_pos = _rl_last_v_pos = 0;
1703 _rl_vis_botlin = last_lmargin = 0;
1705 vis_lbreaks[0] = vis_lbreaks[1] = 0;
1706 visible_wrap_offset = 0;
1710 /* Tell the update routines that we have moved onto a new line with the
1711 prompt already displayed. Code originally from the version of readline
1712 distributed with CLISP. rl_expand_prompt must have already been called
1713 (explicitly or implicitly). This still doesn't work exactly right. */
1715 rl_on_new_line_with_prompt ()
1717 int prompt_size, i, l, real_screenwidth, newlines;
1718 char *prompt_last_line, *lprompt;
1720 /* Initialize visible_line and invisible_line to ensure that they can hold
1721 the already-displayed prompt. */
1722 prompt_size = strlen (rl_prompt) + 1;
1723 init_line_structures (prompt_size);
1725 /* Make sure the line structures hold the already-displayed prompt for
1727 lprompt = local_prompt ? local_prompt : rl_prompt;
1728 strcpy (visible_line, lprompt);
1729 strcpy (invisible_line, lprompt);
1731 /* If the prompt contains newlines, take the last tail. */
1732 prompt_last_line = strrchr (rl_prompt, '\n');
1733 if (!prompt_last_line)
1734 prompt_last_line = rl_prompt;
1736 l = strlen (prompt_last_line);
1737 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1738 _rl_last_c_pos = _rl_col_width (prompt_last_line, 0, l); /* XXX */
1742 /* Dissect prompt_last_line into screen lines. Note that here we have
1743 to use the real screenwidth. Readline's notion of screenwidth might be
1744 one less, see terminal.c. */
1745 real_screenwidth = _rl_screenwidth + (_rl_term_autowrap ? 0 : 1);
1746 _rl_last_v_pos = l / real_screenwidth;
1747 /* If the prompt length is a multiple of real_screenwidth, we don't know
1748 whether the cursor is at the end of the last line, or already at the
1749 beginning of the next line. Output a newline just to be safe. */
1750 if (l > 0 && (l % real_screenwidth) == 0)
1751 _rl_output_some_chars ("\n", 1);
1754 newlines = 0; i = 0;
1757 _rl_vis_botlin = newlines;
1758 vis_lbreaks[newlines++] = i;
1759 i += real_screenwidth;
1761 vis_lbreaks[newlines] = l;
1762 visible_wrap_offset = 0;
1764 rl_display_prompt = rl_prompt; /* XXX - make sure it's set */
1769 /* Actually update the display, period. */
1771 rl_forced_update_display ()
1773 register char *temp;
1777 temp = visible_line;
1783 (*rl_redisplay_function) ();
1787 /* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices.
1788 (Well, when we don't have multibyte characters, _rl_last_c_pos is a
1790 DATA is the contents of the screen line of interest; i.e., where
1791 the movement is being done. */
1793 _rl_move_cursor_relative (new, data)
1798 int woff; /* number of invisible chars on current line */
1799 int cpos, dpos; /* current and desired cursor positions */
1801 woff = WRAP_OFFSET (_rl_last_v_pos, wrap_offset);
1802 cpos = _rl_last_c_pos;
1803 #if defined (HANDLE_MULTIBYTE)
1804 /* If we have multibyte characters, NEW is indexed by the buffer point in
1805 a multibyte string, but _rl_last_c_pos is the display position. In
1806 this case, NEW's display position is not obvious and must be
1807 calculated. We need to account for invisible characters in this line,
1808 as long as we are past them and they are counted by _rl_col_width. */
1809 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1811 dpos = _rl_col_width (data, 0, new);
1812 /* Use NEW when comparing against the last invisible character in the
1813 prompt string, since they're both buffer indices and DPOS is a
1814 desired display position. */
1815 if ((new > prompt_last_invisible) || /* XXX - don't use woff here */
1816 (prompt_physical_chars > _rl_screenwidth &&
1817 _rl_last_v_pos == prompt_last_screen_line &&
1818 wrap_offset != woff &&
1819 new > (prompt_last_invisible-_rl_screenwidth-wrap_offset)))
1822 /* Since this will be assigned to _rl_last_c_pos at the end (more
1823 precisely, _rl_last_c_pos == dpos when this function returns),
1824 let the caller know. */
1832 /* If we don't have to do anything, then return. */
1836 /* It may be faster to output a CR, and then move forwards instead
1837 of moving backwards. */
1838 /* i == current physical cursor position. */
1839 #if defined (HANDLE_MULTIBYTE)
1840 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1844 i = _rl_last_c_pos - woff;
1845 if (dpos == 0 || CR_FASTER (dpos, _rl_last_c_pos) ||
1846 (_rl_term_autowrap && i == _rl_screenwidth))
1848 #if defined (__MSDOS__)
1849 putc ('\r', rl_outstream);
1851 tputs (_rl_term_cr, 1, _rl_output_character_function);
1852 #endif /* !__MSDOS__ */
1853 cpos = _rl_last_c_pos = 0;
1858 /* Move the cursor forward. We do it by printing the command
1859 to move the cursor forward if there is one, else print that
1860 portion of the output buffer again. Which is cheaper? */
1862 /* The above comment is left here for posterity. It is faster
1863 to print one character (non-control) than to print a control
1864 sequence telling the terminal to move forward one character.
1865 That kind of control is for people who don't know what the
1866 data is underneath the cursor. */
1868 /* However, we need a handle on where the current display position is
1869 in the buffer for the immediately preceding comment to be true.
1870 In multibyte locales, we don't currently have that info available.
1871 Without it, we don't know where the data we have to display begins
1872 in the buffer and we have to go back to the beginning of the screen
1873 line. In this case, we can use the terminal sequence to move forward
1874 if it's available. */
1875 if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
1877 if (_rl_term_forward_char)
1879 for (i = cpos; i < dpos; i++)
1880 tputs (_rl_term_forward_char, 1, _rl_output_character_function);
1884 tputs (_rl_term_cr, 1, _rl_output_character_function);
1885 for (i = 0; i < new; i++)
1886 putc (data[i], rl_outstream);
1890 for (i = cpos; i < new; i++)
1891 putc (data[i], rl_outstream);
1894 #if defined (HANDLE_MULTIBYTE)
1895 /* NEW points to the buffer point, but _rl_last_c_pos is the display point.
1896 The byte length of the string is probably bigger than the column width
1897 of the string, which means that if NEW == _rl_last_c_pos, then NEW's
1898 display point is less than _rl_last_c_pos. */
1900 else if (cpos > dpos)
1901 _rl_backspace (cpos - dpos);
1903 _rl_last_c_pos = dpos;
1906 /* PWP: move the cursor up or down. */
1911 register int delta, i;
1913 if (_rl_last_v_pos == to || to > _rl_screenheight)
1916 if ((delta = to - _rl_last_v_pos) > 0)
1918 for (i = 0; i < delta; i++)
1919 putc ('\n', rl_outstream);
1920 #if defined (__MSDOS__)
1921 putc ('\r', rl_outstream);
1923 tputs (_rl_term_cr, 1, _rl_output_character_function);
1929 if (_rl_term_up && *_rl_term_up)
1930 for (i = 0; i < -delta; i++)
1931 tputs (_rl_term_up, 1, _rl_output_character_function);
1934 _rl_last_v_pos = to; /* Now TO is here */
1937 /* Physically print C on rl_outstream. This is for functions which know
1938 how to optimize the display. Return the number of characters output. */
1944 if (META_CHAR (c) && (_rl_output_meta_chars == 0))
1946 fprintf (rl_outstream, "M-");
1951 #if defined (DISPLAY_TABS)
1952 if ((CTRL_CHAR (c) && c != '\t') || c == RUBOUT)
1954 if (CTRL_CHAR (c) || c == RUBOUT)
1955 #endif /* !DISPLAY_TABS */
1957 fprintf (rl_outstream, "C-");
1959 c = CTRL_CHAR (c) ? UNCTRL (c) : '?';
1962 putc (c, rl_outstream);
1963 fflush (rl_outstream);
1968 rl_character_len (c, pos)
1969 register int c, pos;
1973 uc = (unsigned char)c;
1976 return ((_rl_output_meta_chars == 0) ? 4 : 1);
1980 #if defined (DISPLAY_TABS)
1981 return (((pos | 7) + 1) - pos);
1984 #endif /* !DISPLAY_TABS */
1987 if (CTRL_CHAR (c) || c == RUBOUT)
1990 return ((ISPRINT (uc)) ? 1 : 2);
1992 /* How to print things in the "echo-area". The prompt is treated as a
1994 static int msg_saved_prompt = 0;
1996 #if defined (USE_VARARGS)
1998 #if defined (PREFER_STDARG)
1999 rl_message (const char *format, ...)
2001 rl_message (va_alist)
2006 #if defined (PREFER_VARARGS)
2010 #if defined (PREFER_STDARG)
2011 va_start (args, format);
2014 format = va_arg (args, char *);
2017 #if defined (HAVE_VSNPRINTF)
2018 vsnprintf (msg_buf, sizeof (msg_buf) - 1, format, args);
2020 vsprintf (msg_buf, format, args);
2021 msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */
2025 if (saved_local_prompt == 0)
2028 msg_saved_prompt = 1;
2030 rl_display_prompt = msg_buf;
2031 local_prompt = expand_prompt (msg_buf, &prompt_visible_length,
2032 &prompt_last_invisible,
2033 &prompt_invis_chars_first_line,
2034 &prompt_physical_chars);
2035 local_prompt_prefix = (char *)NULL;
2036 local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
2037 (*rl_redisplay_function) ();
2041 #else /* !USE_VARARGS */
2043 rl_message (format, arg1, arg2)
2046 sprintf (msg_buf, format, arg1, arg2);
2047 msg_buf[sizeof(msg_buf) - 1] = '\0'; /* overflow? */
2049 rl_display_prompt = msg_buf;
2050 if (saved_local_prompt == 0)
2053 msg_saved_prompt = 1;
2055 local_prompt = expand_prompt (msg_buf, &prompt_visible_length,
2056 &prompt_last_invisible,
2057 &prompt_invis_chars_first_line,
2058 &prompt_physical_chars);
2059 local_prompt_prefix = (char *)NULL;
2060 local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
2061 (*rl_redisplay_function) ();
2065 #endif /* !USE_VARARGS */
2067 /* How to clear things from the "echo-area". */
2071 rl_display_prompt = rl_prompt;
2072 if (msg_saved_prompt)
2074 rl_restore_prompt ();
2075 msg_saved_prompt = 0;
2077 (*rl_redisplay_function) ();
2082 rl_reset_line_state ()
2086 rl_display_prompt = rl_prompt ? rl_prompt : "";
2094 saved_local_prompt = local_prompt;
2095 saved_local_prefix = local_prompt_prefix;
2096 saved_prefix_length = prompt_prefix_length;
2097 saved_local_length = local_prompt_len;
2098 saved_last_invisible = prompt_last_invisible;
2099 saved_visible_length = prompt_visible_length;
2100 saved_invis_chars_first_line = prompt_invis_chars_first_line;
2101 saved_physical_chars = prompt_physical_chars;
2103 local_prompt = local_prompt_prefix = (char *)0;
2104 local_prompt_len = 0;
2105 prompt_last_invisible = prompt_visible_length = prompt_prefix_length = 0;
2106 prompt_invis_chars_first_line = prompt_physical_chars = 0;
2110 rl_restore_prompt ()
2112 FREE (local_prompt);
2113 FREE (local_prompt_prefix);
2115 local_prompt = saved_local_prompt;
2116 local_prompt_prefix = saved_local_prefix;
2117 local_prompt_len = saved_local_length;
2118 prompt_prefix_length = saved_prefix_length;
2119 prompt_last_invisible = saved_last_invisible;
2120 prompt_visible_length = saved_visible_length;
2121 prompt_invis_chars_first_line = saved_invis_chars_first_line;
2122 prompt_physical_chars = saved_physical_chars;
2124 /* can test saved_local_prompt to see if prompt info has been saved. */
2125 saved_local_prompt = saved_local_prefix = (char *)0;
2126 saved_local_length = 0;
2127 saved_last_invisible = saved_visible_length = saved_prefix_length = 0;
2128 saved_invis_chars_first_line = saved_physical_chars = 0;
2132 _rl_make_prompt_for_search (pchar)
2140 /* We've saved the prompt, and can do anything with the various prompt
2141 strings we need before they're restored. We want the unexpanded
2142 portion of the prompt string after any final newline. */
2143 p = rl_prompt ? strrchr (rl_prompt, '\n') : 0;
2146 len = (rl_prompt && *rl_prompt) ? strlen (rl_prompt) : 0;
2147 pmt = (char *)xmalloc (len + 2);
2149 strcpy (pmt, rl_prompt);
2157 pmt = (char *)xmalloc (len + 2);
2164 /* will be overwritten by expand_prompt, called from rl_message */
2165 prompt_physical_chars = saved_physical_chars + 1;
2169 /* Quick redisplay hack when erasing characters at the end of the line. */
2171 _rl_erase_at_end_of_line (l)
2177 for (i = 0; i < l; i++)
2178 putc (' ', rl_outstream);
2180 for (i = 0; i < l; i++)
2181 visible_line[--_rl_last_c_pos] = '\0';
2185 /* Clear to the end of the line. COUNT is the minimum
2186 number of character spaces to clear, */
2188 _rl_clear_to_eol (count)
2191 if (_rl_term_clreol)
2192 tputs (_rl_term_clreol, 1, _rl_output_character_function);
2194 space_to_eol (count);
2197 /* Clear to the end of the line using spaces. COUNT is the minimum
2198 number of character spaces to clear, */
2200 space_to_eol (count)
2205 for (i = 0; i < count; i++)
2206 putc (' ', rl_outstream);
2208 _rl_last_c_pos += count;
2214 if (_rl_term_clrpag)
2215 tputs (_rl_term_clrpag, 1, _rl_output_character_function);
2220 /* Insert COUNT characters from STRING to the output stream at column COL. */
2222 insert_some_chars (string, count, col)
2226 #if defined (__MSDOS__) || defined (__MINGW32__)
2227 _rl_output_some_chars (string, count);
2230 if (MB_CUR_MAX == 1 || rl_byte_oriented)
2232 fprintf(stderr, "readline: debug: insert_some_chars: count (%d) != col (%d)\n", count, col);
2234 /* If IC is defined, then we do not have to "enter" insert mode. */
2239 buffer = tgoto (_rl_term_IC, 0, col);
2240 tputs (buffer, 1, _rl_output_character_function);
2241 _rl_output_some_chars (string, count);
2247 /* If we have to turn on insert-mode, then do so. */
2248 if (_rl_term_im && *_rl_term_im)
2249 tputs (_rl_term_im, 1, _rl_output_character_function);
2251 /* If there is a special command for inserting characters, then
2252 use that first to open up the space. */
2253 if (_rl_term_ic && *_rl_term_ic)
2255 for (i = col; i--; )
2256 tputs (_rl_term_ic, 1, _rl_output_character_function);
2259 /* Print the text. */
2260 _rl_output_some_chars (string, count);
2262 /* If there is a string to turn off insert mode, we had best use
2264 if (_rl_term_ei && *_rl_term_ei)
2265 tputs (_rl_term_ei, 1, _rl_output_character_function);
2267 #endif /* __MSDOS__ || __MINGW32__ */
2270 /* Delete COUNT characters from the display line. */
2272 delete_chars (count)
2275 if (count > _rl_screenwidth) /* XXX */
2278 #if !defined (__MSDOS__) && !defined (__MINGW32__)
2279 if (_rl_term_DC && *_rl_term_DC)
2282 buffer = tgoto (_rl_term_DC, count, count);
2283 tputs (buffer, count, _rl_output_character_function);
2287 if (_rl_term_dc && *_rl_term_dc)
2289 tputs (_rl_term_dc, 1, _rl_output_character_function);
2291 #endif /* !__MSDOS__ && !__MINGW32__ */
2300 /* If the cursor is the only thing on an otherwise-blank last line,
2301 compensate so we don't print an extra CRLF. */
2302 if (_rl_vis_botlin && _rl_last_c_pos == 0 &&
2303 visible_line[vis_lbreaks[_rl_vis_botlin]] == 0)
2308 _rl_move_vert (_rl_vis_botlin);
2309 /* If we've wrapped lines, remove the final xterm line-wrap flag. */
2310 if (full_lines && _rl_term_autowrap && (VIS_LLEN(_rl_vis_botlin) == _rl_screenwidth))
2314 last_line = &visible_line[vis_lbreaks[_rl_vis_botlin]];
2315 cpos_buffer_position = -1; /* don't know where we are in buffer */
2316 _rl_move_cursor_relative (_rl_screenwidth - 1, last_line); /* XXX */
2317 _rl_clear_to_eol (0);
2318 putc (last_line[_rl_screenwidth - 1], rl_outstream);
2322 fflush (rl_outstream);
2326 /* Move to the start of the current line. */
2332 #if defined (__MSDOS__)
2333 putc ('\r', rl_outstream);
2335 tputs (_rl_term_cr, 1, _rl_output_character_function);
2341 /* Redraw the last line of a multi-line prompt that may possibly contain
2342 terminal escape sequences. Called with the cursor at column 0 of the
2343 line to draw the prompt on. */
2350 oldp = rl_display_prompt;
2353 rl_display_prompt = t;
2354 local_prompt = expand_prompt (t, &prompt_visible_length,
2355 &prompt_last_invisible,
2356 &prompt_invis_chars_first_line,
2357 &prompt_physical_chars);
2358 local_prompt_prefix = (char *)NULL;
2359 local_prompt_len = local_prompt ? strlen (local_prompt) : 0;
2361 rl_forced_update_display ();
2363 rl_display_prompt = oldp;
2364 rl_restore_prompt();
2367 /* Redisplay the current line after a SIGWINCH is received. */
2369 _rl_redisplay_after_sigwinch ()
2373 /* Clear the current line and put the cursor at column 0. Make sure
2374 the right thing happens if we have wrapped to a new screen line. */
2377 #if defined (__MSDOS__)
2378 putc ('\r', rl_outstream);
2380 tputs (_rl_term_cr, 1, _rl_output_character_function);
2383 #if defined (__MSDOS__)
2384 space_to_eol (_rl_screenwidth);
2385 putc ('\r', rl_outstream);
2387 if (_rl_term_clreol)
2388 tputs (_rl_term_clreol, 1, _rl_output_character_function);
2391 space_to_eol (_rl_screenwidth);
2392 tputs (_rl_term_cr, 1, _rl_output_character_function);
2395 if (_rl_last_v_pos > 0)
2401 /* Redraw only the last line of a multi-line prompt. */
2402 t = strrchr (rl_display_prompt, '\n');
2404 redraw_prompt (++t);
2406 rl_forced_update_display ();
2410 _rl_clean_up_for_exit ()
2412 if (readline_echoing_p)
2414 _rl_move_vert (_rl_vis_botlin);
2416 fflush (rl_outstream);
2417 rl_restart_output (1, 0);
2422 _rl_erase_entire_line ()
2425 _rl_clear_to_eol (0);
2427 fflush (rl_outstream);
2430 /* return the `current display line' of the cursor -- the number of lines to
2431 move up to get to the first screen line of the current readline line. */
2433 _rl_current_display_line ()
2437 /* Find out whether or not there might be invisible characters in the
2439 if (rl_display_prompt == rl_prompt)
2440 nleft = _rl_last_c_pos - _rl_screenwidth - rl_visible_prompt_length;
2442 nleft = _rl_last_c_pos - _rl_screenwidth;
2445 ret = 1 + nleft / _rl_screenwidth;
2452 #if defined (HANDLE_MULTIBYTE)
2453 /* Calculate the number of screen columns occupied by STR from START to END.
2454 In the case of multibyte characters with stateful encoding, we have to
2455 scan from the beginning of the string to take the state into account. */
2457 _rl_col_width (str, start, end)
2463 int tmp, point, width, max;
2467 if (MB_CUR_MAX == 1 || rl_byte_oriented)
2468 return (end - start);
2470 memset (&ps, 0, sizeof (mbstate_t));
2475 while (point < start)
2477 tmp = mbrlen (str + point, max, &ps);
2478 if (MB_INVALIDCH ((size_t)tmp))
2480 /* In this case, the bytes are invalid or too short to compose a
2481 multibyte character, so we assume that the first byte represents
2482 a single character. */
2486 /* Clear the state of the byte sequence, because in this case the
2487 effect of mbstate is undefined. */
2488 memset (&ps, 0, sizeof (mbstate_t));
2490 else if (MB_NULLWCH (tmp))
2491 break; /* Found '\0' */
2499 /* If START is not a byte that starts a character, then POINT will be
2500 greater than START. In this case, assume that (POINT - START) gives
2501 a byte count that is the number of columns of difference. */
2502 width = point - start;
2506 tmp = mbrtowc (&wc, str + point, max, &ps);
2507 if (MB_INVALIDCH ((size_t)tmp))
2509 /* In this case, the bytes are invalid or too short to compose a
2510 multibyte character, so we assume that the first byte represents
2511 a single character. */
2515 /* and assume that the byte occupies a single column. */
2518 /* Clear the state of the byte sequence, because in this case the
2519 effect of mbstate is undefined. */
2520 memset (&ps, 0, sizeof (mbstate_t));
2522 else if (MB_NULLWCH (tmp))
2523 break; /* Found '\0' */
2529 width += (tmp >= 0) ? tmp : 1;
2533 width += point - end;
2537 #endif /* HANDLE_MULTIBYTE */