1 /* display.c -- readline redisplay facility. */
3 /* Copyright (C) 1987-2017 Free Software Foundation, Inc.
5 This file is part of the GNU Readline Library (Readline), a library
6 for reading lines of text with interactive input and history editing.
8 Readline is free software: you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 3 of the License, or
11 (at your option) any later version.
13 Readline is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with Readline. If not, see <http://www.gnu.org/licenses/>.
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 */
48 /* System-specific feature definitions and include files. */
52 /* Termcap library stuff. */
55 /* Some standard library routines. */
59 #include "rlprivate.h"
62 #if !defined (strchr) && !defined (__STDC__)
63 extern char *strchr (), *strrchr ();
64 #endif /* !strchr && !__STDC__ */
66 static void update_line
PARAMS((char *, char *, int, int, int, int));
67 static void space_to_eol
PARAMS((int));
68 static void delete_chars
PARAMS((int));
69 static void insert_some_chars
PARAMS((char *, int, int));
70 static void open_some_spaces
PARAMS((int));
71 static void cr
PARAMS((void));
72 static void redraw_prompt
PARAMS((char *));
74 /* Values for FLAGS */
75 #define PMT_MULTILINE 0x01
77 static char *expand_prompt
PARAMS((char *, int, int *, int *, int *, int *));
79 /* State of visible and invisible lines. */
85 #if defined (HANDLE_MULTIBYTE)
91 /* The line display buffers. One is the line currently displayed on
92 the screen. The other is the line about to be displayed. */
93 static struct line_state line_state_array
[2];
94 static struct line_state
*line_state_visible
= &line_state_array
[0];
95 static struct line_state
*line_state_invisible
= &line_state_array
[1];
96 static int line_structures_initialized
= 0;
98 /* Backwards-compatible names. */
99 #define inv_lbreaks (line_state_invisible->lbreaks)
100 #define inv_lbsize (line_state_invisible->lbsize)
101 #define vis_lbreaks (line_state_visible->lbreaks)
102 #define vis_lbsize (line_state_visible->lbsize)
104 #define visible_line (line_state_visible->line)
105 #define invisible_line (line_state_invisible->line)
107 #if defined (HANDLE_MULTIBYTE)
108 static int _rl_col_width
PARAMS((const char *, int, int, int));
110 # define _rl_col_width(l, s, e, f) (((e) <= (s)) ? 0 : (e) - (s))
113 /* Heuristic used to decide whether it is faster to move from CUR to NEW
114 by backing up or outputting a carriage return and moving forward. CUR
115 and NEW are either both buffer positions or absolute screen positions. */
116 #define CR_FASTER(new, cur) (((new) + 1) < ((cur) - (new)))
118 /* _rl_last_c_pos is an absolute cursor position in multibyte locales and a
119 buffer index in others. This macro is used when deciding whether the
120 current cursor position is in the middle of a prompt string containing
121 invisible characters. XXX - might need to take `modmark' into account. */
122 /* XXX - only valid when tested against _rl_last_c_pos; buffer indices need
123 to use prompt_last_invisible directly. */
124 #define PROMPT_ENDING_INDEX \
125 ((MB_CUR_MAX > 1 && rl_byte_oriented == 0) ? prompt_physical_chars : prompt_last_invisible+1)
127 /* **************************************************************** */
131 /* **************************************************************** */
133 /* This is the stuff that is hard for me. I never seem to write good
134 display routines in C. Let's see how I do this time. */
136 /* (PWP) Well... Good for a simple line updater, but totally ignores
137 the problems of input lines longer than the screen width.
139 update_line and the code that calls it makes a multiple line,
140 automatically wrapping line update. Careful attention needs
141 to be paid to the vertical position variables. */
143 /* Keep two buffers; one which reflects the current contents of the
144 screen, and the other to draw what we think the new contents should
145 be. Then compare the buffers, and make whatever changes to the
146 screen itself that we should. Finally, make the buffer that we
147 just drew into be the one which reflects the current contents of the
148 screen, and place the cursor where it belongs.
150 Commands that want to can fix the display themselves, and then let
151 this function know that the display has been fixed by setting the
152 RL_DISPLAY_FIXED variable. This is good for efficiency. */
154 /* Application-specific redisplay function. */
155 rl_voidfunc_t
*rl_redisplay_function
= rl_redisplay
;
157 /* Global variables declared here. */
158 /* What YOU turn on when you have handled all redisplay yourself. */
159 int rl_display_fixed
= 0;
161 /* The stuff that gets printed out before the actual text of the line.
162 This is usually pointing to rl_prompt. */
163 char *rl_display_prompt
= (char *)NULL
;
165 /* Variables used to include the editing mode in the prompt. */
166 char *_rl_emacs_mode_str
;
167 int _rl_emacs_modestr_len
;
169 char *_rl_vi_ins_mode_str
;
170 int _rl_vi_ins_modestr_len
;
172 char *_rl_vi_cmd_mode_str
;
173 int _rl_vi_cmd_modestr_len
;
175 /* Pseudo-global variables declared here. */
177 /* Hints for other parts of readline to give to the display engine. */
178 int _rl_suppress_redisplay
= 0;
179 int _rl_want_redisplay
= 0;
181 /* The visible cursor position. If you print some text, adjust this. */
182 /* NOTE: _rl_last_c_pos is used as a buffer index when not in a locale
183 supporting multibyte characters, and an absolute cursor position when
184 in such a locale. This is an artifact of the donated multibyte support.
185 Care must be taken when modifying its value. */
186 int _rl_last_c_pos
= 0;
187 int _rl_last_v_pos
= 0;
189 /* Number of physical lines consumed by the current line buffer currently
190 on screen minus 1. */
191 int _rl_vis_botlin
= 0;
193 /* This is a hint update_line gives to rl_redisplay that it has adjusted the
194 value of _rl_last_c_pos *and* taken the presence of any invisible chars in
195 the prompt into account. rl_redisplay notes this and does not do the
196 adjustment itself. */
197 static int cpos_adjusted
;
199 /* The index into the line buffer corresponding to the cursor position */
200 static int cpos_buffer_position
;
202 /* A flag to note when we're displaying the first line of the prompt */
203 static int displaying_prompt_first_line
;
204 /* The number of multibyte characters in the prompt, if any */
205 static int prompt_multibyte_chars
;
207 static int _rl_inv_botlin
= 0;
209 /* Variables used only in this file. */
210 /* The last left edge of text that was displayed. This is used when
211 doing horizontal scrolling. It shifts in thirds of a screenwidth. */
212 static int last_lmargin
;
214 /* A buffer for `modeline' messages. */
215 static char *msg_buf
= 0;
216 static int msg_bufsiz
= 0;
218 /* Non-zero forces the redisplay even if we thought it was unnecessary. */
219 static int forced_display
;
221 /* Default and initial buffer size. Can grow. */
222 static int line_size
= 1024;
224 /* Variables to keep track of the expanded prompt string, which may
225 include invisible characters. */
227 static char *local_prompt
, *local_prompt_prefix
;
228 static int local_prompt_len
;
229 static int prompt_prefix_length
;
230 /* Number of chars in the buffer that contribute to visible chars on the screen.
231 This might be different from the number of physical chars in the presence
232 of multibyte characters */
233 static int prompt_visible_length
;
235 /* The number of invisible characters in the line currently being
236 displayed on the screen. */
237 static int visible_wrap_offset
;
239 /* The number of invisible characters in the prompt string. Static so it
240 can be shared between rl_redisplay and update_line */
241 static int wrap_offset
;
243 /* The index of the last invisible character in the prompt string. */
244 static int prompt_last_invisible
;
246 /* The length (buffer offset) of the first line of the last (possibly
247 multi-line) buffer displayed on the screen. */
248 static int visible_first_line_len
;
250 /* Number of invisible characters on the first physical line of the prompt.
251 Only valid when the number of physical characters in the prompt exceeds
252 (or is equal to) _rl_screenwidth. */
253 static int prompt_invis_chars_first_line
;
255 static int prompt_last_screen_line
;
257 static int prompt_physical_chars
;
259 /* An array of indexes into the prompt string where we will break physical
260 screen lines. It's easier to compute in expand_prompt and use later in
261 rl_redisplay instead of having rl_redisplay try to guess about invisible
262 characters in the prompt or use heuristics about where they are. */
263 static int *local_prompt_newlines
;
265 /* set to a non-zero value by rl_redisplay if we are marking modified history
266 lines and the current line is so marked. */
269 static int line_totbytes
;
271 /* Variables to save and restore prompt and display information. */
273 /* These are getting numerous enough that it's time to create a struct. */
275 static char *saved_local_prompt
;
276 static char *saved_local_prefix
;
277 static int *saved_local_prompt_newlines
;
279 static int saved_last_invisible
;
280 static int saved_visible_length
;
281 static int saved_prefix_length
;
282 static int saved_local_length
;
283 static int saved_invis_chars_first_line
;
284 static int saved_physical_chars
;
286 /* Return a string indicating the editing mode, for use in the prompt. */
289 prompt_modestr (int *lenp
)
291 if (rl_editing_mode
== emacs_mode
)
294 *lenp
= _rl_emacs_mode_str
? _rl_emacs_modestr_len
: RL_EMACS_MODESTR_DEFLEN
;
295 return _rl_emacs_mode_str
? _rl_emacs_mode_str
: RL_EMACS_MODESTR_DEFAULT
;
297 else if (_rl_keymap
== vi_insertion_keymap
)
300 *lenp
= _rl_vi_ins_mode_str
? _rl_vi_ins_modestr_len
: RL_VI_INS_MODESTR_DEFLEN
;
301 return _rl_vi_ins_mode_str
? _rl_vi_ins_mode_str
: RL_VI_INS_MODESTR_DEFAULT
; /* vi insert mode */
306 *lenp
= _rl_vi_cmd_mode_str
? _rl_vi_cmd_modestr_len
: RL_VI_CMD_MODESTR_DEFLEN
;
307 return _rl_vi_cmd_mode_str
? _rl_vi_cmd_mode_str
: RL_VI_CMD_MODESTR_DEFAULT
; /* vi command mode */
311 /* Expand the prompt string S and return the number of visible
312 characters in *LP, if LP is not null. This is currently more-or-less
313 a placeholder for expansion. LIP, if non-null is a place to store the
314 index of the last invisible character in the returned string. NIFLP,
315 if non-zero, is a place to store the number of invisible characters in
316 the first prompt line. The previous are used as byte counts -- indexes
317 into a character buffer. *VLP gets the number of physical characters in
318 the expanded prompt (visible length) */
320 /* Current implementation:
321 \001 (^A) start non-visible characters
322 \002 (^B) end non-visible characters
323 all characters except \001 and \002 (following a \001) are copied to
324 the returned string; all characters except those between \001 and
325 \002 are assumed to be `visible'. */
327 /* Possible values for FLAGS:
328 PMT_MULTILINE caller indicates that this is part of a multiline prompt
331 /* This approximates the number of lines the prompt will take when displayed */
332 #define APPROX_DIV(n, d) (((n) < (d)) ? 1 : ((n) / (d)) + 1)
335 expand_prompt (char *pmt
, int flags
, int *lp
, int *lip
, int *niflp
, int *vlp
)
337 char *r
, *ret
, *p
, *igstart
, *nprompt
, *ms
;
338 int l
, rl
, last
, ignoring
, ninvis
, invfl
, invflset
, ind
, pind
, physchars
;
339 int mlen
, newlines
, newlines_guess
, bound
;
342 /* We only expand the mode string for the last line of a multiline prompt
343 (a prompt with embedded newlines). */
344 ms
= (((pmt
== rl_prompt
) ^ (flags
& PMT_MULTILINE
)) && _rl_show_mode_in_prompt
) ? prompt_modestr (&mlen
) : 0;
348 nprompt
= (char *)xmalloc (l
+ mlen
+ 1);
349 memcpy (nprompt
, ms
, mlen
);
350 strcpy (nprompt
+ mlen
, pmt
);
355 mb_cur_max
= MB_CUR_MAX
;
357 if (_rl_screenwidth
== 0)
358 _rl_get_screen_size (0, 0); /* avoid division by zero */
360 /* Short-circuit if we can. We can do this if we are treating the prompt as
361 a sequence of bytes and there are no invisible characters in the prompt
362 to deal with. Since we populate local_prompt_newlines, we have to run
363 through the rest of the function if this prompt looks like it's going to
364 be longer than one screen line. */
365 if ((mb_cur_max
<= 1 || rl_byte_oriented
) && strchr (nprompt
, RL_PROMPT_START_IGNORE
) == 0)
367 l
= strlen (nprompt
);
368 if (l
< (_rl_screenwidth
> 0 ? _rl_screenwidth
: 80))
370 r
= (nprompt
== pmt
) ? savestring (pmt
) : nprompt
;
380 local_prompt_newlines
= (int *) xrealloc (local_prompt_newlines
, sizeof (int) * 2);
381 local_prompt_newlines
[0] = 0;
382 local_prompt_newlines
[1] = -1;
388 l
= strlen (nprompt
); /* XXX */
389 r
= ret
= (char *)xmalloc (l
+ 1);
391 /* Guess at how many screen lines the prompt will take to size the array that
392 keeps track of where the line wraps happen */
393 newlines_guess
= (_rl_screenwidth
> 0) ? APPROX_DIV(l
, _rl_screenwidth
) : APPROX_DIV(l
, 80);
394 local_prompt_newlines
= (int *) xrealloc (local_prompt_newlines
, sizeof (int) * (newlines_guess
+ 1));
395 local_prompt_newlines
[newlines
= 0] = 0;
396 for (rl
= 1; rl
<= newlines_guess
; rl
++)
397 local_prompt_newlines
[rl
] = -1;
399 rl
= physchars
= 0; /* mode string now part of nprompt */
400 invfl
= 0; /* invisible chars in first line of prompt */
401 invflset
= 0; /* we only want to set invfl once */
402 igstart
= 0; /* we're not ignoring any characters yet */
404 for (ignoring
= last
= ninvis
= 0, p
= nprompt
; p
&& *p
; p
++)
406 /* This code strips the invisible character string markers
407 RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE */
408 if (ignoring
== 0 && *p
== RL_PROMPT_START_IGNORE
) /* XXX - check ignoring? */
414 else if (ignoring
&& *p
== RL_PROMPT_END_IGNORE
)
417 if (p
!= (igstart
+ 1))
423 #if defined (HANDLE_MULTIBYTE)
424 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
427 ind
= _rl_find_next_mbchar (nprompt
, pind
, 1, MB_FIND_NONZERO
);
433 /* rl ends up being assigned to prompt_visible_length,
434 which is the number of characters in the buffer that
435 contribute to characters on the screen, which might
436 not be the same as the number of physical characters
437 on the screen in the presence of multibyte characters */
439 physchars
+= _rl_col_width (nprompt
, pind
, ind
, 0);
442 ninvis
+= ind
- pind
;
443 p
--; /* compensate for later increment */
451 rl
++; /* visible length byte counter */
455 ninvis
++; /* invisible chars byte counter */
458 if (invflset
== 0 && physchars
>= _rl_screenwidth
)
464 if (physchars
>= (bound
= (newlines
+ 1) * _rl_screenwidth
) && local_prompt_newlines
[newlines
+1] == -1)
467 if (physchars
> bound
) /* should rarely happen */
469 #if defined (HANDLE_MULTIBYTE)
470 *r
= '\0'; /* need null-termination for strlen */
471 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
472 new = _rl_find_prev_mbchar (ret
, r
- ret
, MB_FIND_ANY
);
475 new = r
- ret
- (physchars
- bound
); /* XXX */
479 local_prompt_newlines
[++newlines
] = new;
484 if (rl
< _rl_screenwidth
)
503 /* Just strip out RL_PROMPT_START_IGNORE and RL_PROMPT_END_IGNORE from
504 PMT and return the rest of PMT. */
506 _rl_strip_prompt (char *pmt
)
510 ret
= expand_prompt (pmt
, 0, (int *)NULL
, (int *)NULL
, (int *)NULL
, (int *)NULL
);
515 _rl_reset_prompt (void)
517 rl_visible_prompt_length
= rl_expand_prompt (rl_prompt
);
521 * Expand the prompt string into the various display components, if
524 * local_prompt = expanded last line of string in rl_display_prompt
525 * (portion after the final newline)
526 * local_prompt_prefix = portion before last newline of rl_display_prompt,
527 * expanded via expand_prompt
528 * prompt_visible_length = number of visible characters in local_prompt
529 * prompt_prefix_length = number of visible characters in local_prompt_prefix
531 * It also tries to keep track of the number of invisible characters in the
532 * prompt string, and where they are.
534 * This function is called once per call to readline(). It may also be
535 * called arbitrarily to expand the primary prompt.
537 * The return value is the number of visible characters on the last line
538 * of the (possibly multi-line) prompt. In this case, multi-line means
539 * there are embedded newlines in the prompt string itself, not that the
540 * number of physical characters exceeds the screen width and the prompt
544 rl_expand_prompt (char *prompt
)
549 /* Clear out any saved values. */
551 FREE (local_prompt_prefix
);
553 local_prompt
= local_prompt_prefix
= (char *)0;
554 local_prompt_len
= 0;
555 prompt_last_invisible
= prompt_invis_chars_first_line
= 0;
556 prompt_visible_length
= prompt_physical_chars
= 0;
558 if (prompt
== 0 || *prompt
== 0)
561 p
= strrchr (prompt
, '\n');
564 /* The prompt is only one logical line, though it might wrap. */
565 local_prompt
= expand_prompt (prompt
, 0, &prompt_visible_length
,
566 &prompt_last_invisible
,
567 &prompt_invis_chars_first_line
,
568 &prompt_physical_chars
);
569 local_prompt_prefix
= (char *)0;
570 local_prompt_len
= local_prompt
? strlen (local_prompt
) : 0;
571 return (prompt_visible_length
);
575 /* The prompt spans multiple lines. */
577 local_prompt
= expand_prompt (p
, PMT_MULTILINE
,
578 &prompt_visible_length
,
579 &prompt_last_invisible
,
580 &prompt_invis_chars_first_line
,
581 &prompt_physical_chars
);
583 /* The portion of the prompt string up to and including the
584 final newline is now null-terminated. */
585 local_prompt_prefix
= expand_prompt (prompt
, PMT_MULTILINE
,
586 &prompt_prefix_length
,
591 local_prompt_len
= local_prompt
? strlen (local_prompt
) : 0;
592 return (prompt_prefix_length
);
596 /* Initialize the VISIBLE_LINE and INVISIBLE_LINE arrays, and their associated
597 arrays of line break markers. MINSIZE is the minimum size of VISIBLE_LINE
598 and INVISIBLE_LINE; if it is greater than LINE_SIZE, LINE_SIZE is
599 increased. If the lines have already been allocated, this ensures that
600 they can hold at least MINSIZE characters. */
602 init_line_structures (int minsize
)
605 int original_minsize
= minsize
;
607 if (minsize
<= _rl_screenwidth
) /* XXX - for gdb */
608 minsize
= _rl_screenwidth
+ 1;
610 if (invisible_line
== 0) /* initialize it */
612 if (line_size
< minsize
)
614 visible_line
= (char *)xmalloc (line_size
);
615 invisible_line
= (char *)xmalloc (line_size
);
617 else if (line_size
< minsize
) /* ensure it can hold MINSIZE chars */
620 if (line_size
< minsize
)
622 visible_line
= (char *)xrealloc (visible_line
, line_size
);
623 invisible_line
= (char *)xrealloc (invisible_line
, line_size
);
626 for (n
= original_minsize
; n
< line_size
; n
++)
629 invisible_line
[n
] = 1;
632 if (vis_lbreaks
== 0)
634 /* should be enough. */
635 inv_lbsize
= vis_lbsize
= 256;
637 #if defined (HANDLE_MULTIBYTE)
638 line_state_visible
->wbsize
= vis_lbsize
;
639 line_state_visible
->wrapped_line
= (int *)xmalloc (line_state_visible
->wbsize
* sizeof (int));
641 line_state_invisible
->wbsize
= inv_lbsize
;
642 line_state_invisible
->wrapped_line
= (int *)xmalloc (line_state_invisible
->wbsize
* sizeof (int));
645 inv_lbreaks
= (int *)xmalloc (inv_lbsize
* sizeof (int));
646 vis_lbreaks
= (int *)xmalloc (vis_lbsize
* sizeof (int));
647 inv_lbreaks
[0] = vis_lbreaks
[0] = 0;
650 line_structures_initialized
= 1;
653 /* Basic redisplay algorithm. See comments inline. */
657 register int in
, out
, c
, linenum
, cursor_linenum
;
659 int inv_botlin
, lb_botlin
, lb_linenum
, o_cpos
;
660 int newlines
, lpos
, temp
, n0
, num
, prompt_lines_estimate
;
661 char *prompt_this_line
;
662 int mb_cur_max
= MB_CUR_MAX
;
663 #if defined (HANDLE_MULTIBYTE)
668 int _rl_wrapped_multicolumn
= 0;
671 if (_rl_echoing_p
== 0)
674 /* Block keyboard interrupts because this function manipulates global
677 RL_SETSTATE (RL_STATE_REDISPLAYING
);
679 if (!rl_display_prompt
)
680 rl_display_prompt
= "";
682 if (line_structures_initialized
== 0)
684 init_line_structures (0);
687 else if (line_size
<= _rl_screenwidth
)
688 init_line_structures (_rl_screenwidth
+ 1);
690 /* Draw the line into the buffer. */
691 cpos_buffer_position
= -1;
693 prompt_multibyte_chars
= prompt_visible_length
- prompt_physical_chars
;
695 line
= invisible_line
;
696 out
= inv_botlin
= 0;
698 /* Mark the line as modified or not. We only do this for history
701 if (_rl_mark_modified_lines
&& current_history () && rl_undo_list
)
708 /* If someone thought that the redisplay was handled, but the currently
709 visible line has a different modification state than the one about
710 to become visible, then correct the caller's misconception. */
711 if (visible_line
[0] != invisible_line
[0])
712 rl_display_fixed
= 0;
714 /* If the prompt to be displayed is the `primary' readline prompt (the
715 one passed to readline()), use the values we have already expanded.
716 If not, use what's already in rl_display_prompt. WRAP_OFFSET is the
717 number of non-visible characters in the prompt string. */
718 /* This is where we output the characters in the prompt before the last
719 newline, if any. If there aren't any embedded newlines, we don't
720 write anything. Copy the last line of the prompt string into the line in
722 if (rl_display_prompt
== rl_prompt
|| local_prompt
)
724 if (local_prompt_prefix
&& forced_display
)
725 _rl_output_some_chars (local_prompt_prefix
, strlen (local_prompt_prefix
));
727 if (local_prompt_len
> 0)
729 temp
= local_prompt_len
+ out
+ 2;
730 if (temp
>= line_size
)
732 line_size
= (temp
+ 1024) - (temp
% 1024);
733 visible_line
= (char *)xrealloc (visible_line
, line_size
);
734 line
= invisible_line
= (char *)xrealloc (invisible_line
, line_size
);
736 strncpy (line
+ out
, local_prompt
, local_prompt_len
);
737 out
+= local_prompt_len
;
740 wrap_offset
= local_prompt_len
- prompt_visible_length
;
745 prompt_this_line
= strrchr (rl_display_prompt
, '\n');
746 if (!prompt_this_line
)
747 prompt_this_line
= rl_display_prompt
;
751 pmtlen
= prompt_this_line
- rl_display_prompt
; /* temp var */
754 _rl_output_some_chars (rl_display_prompt
, pmtlen
);
755 /* Make sure we are at column zero even after a newline,
756 regardless of the state of terminal output processing. */
757 if (pmtlen
< 2 || prompt_this_line
[-2] != '\r')
762 prompt_physical_chars
= pmtlen
= strlen (prompt_this_line
);
763 temp
= pmtlen
+ out
+ 2;
764 if (temp
>= line_size
)
766 line_size
= (temp
+ 1024) - (temp
% 1024);
767 visible_line
= (char *)xrealloc (visible_line
, line_size
);
768 line
= invisible_line
= (char *)xrealloc (invisible_line
, line_size
);
770 strncpy (line
+ out
, prompt_this_line
, pmtlen
);
773 wrap_offset
= prompt_invis_chars_first_line
= 0;
776 #if defined (HANDLE_MULTIBYTE)
777 #define CHECK_INV_LBREAKS() \
779 if (newlines >= (inv_lbsize - 2)) \
782 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
784 if (newlines >= (line_state_invisible->wbsize - 2)) \
786 line_state_invisible->wbsize *= 2; \
787 line_state_invisible->wrapped_line = (int *)xrealloc (line_state_invisible->wrapped_line, line_state_invisible->wbsize * sizeof(int)); \
791 #define CHECK_INV_LBREAKS() \
793 if (newlines >= (inv_lbsize - 2)) \
796 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
799 #endif /* !HANDLE_MULTIBYTE */
801 #if defined (HANDLE_MULTIBYTE)
802 #define CHECK_LPOS() \
805 if (lpos >= _rl_screenwidth) \
807 if (newlines >= (inv_lbsize - 2)) \
810 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
812 inv_lbreaks[++newlines] = out; \
813 if (newlines >= (line_state_invisible->wbsize - 2)) \
815 line_state_invisible->wbsize *= 2; \
816 line_state_invisible->wrapped_line = (int *)xrealloc (line_state_invisible->wrapped_line, line_state_invisible->wbsize * sizeof(int)); \
818 line_state_invisible->wrapped_line[newlines] = _rl_wrapped_multicolumn; \
823 #define CHECK_LPOS() \
826 if (lpos >= _rl_screenwidth) \
828 if (newlines >= (inv_lbsize - 2)) \
831 inv_lbreaks = (int *)xrealloc (inv_lbreaks, inv_lbsize * sizeof (int)); \
833 inv_lbreaks[++newlines] = out; \
839 /* inv_lbreaks[i] is where line i starts in the buffer. */
840 inv_lbreaks
[newlines
= 0] = 0;
841 /* lpos is a physical cursor position, so it needs to be adjusted by the
842 number of invisible characters in the prompt, per line. We compute
843 the line breaks in the prompt string in expand_prompt, taking invisible
844 characters into account, and if lpos exceeds the screen width, we copy
845 the data in the loop below. */
846 lpos
= prompt_physical_chars
+ modmark
;
848 #if defined (HANDLE_MULTIBYTE)
849 memset (line_state_invisible
->wrapped_line
, 0, line_state_invisible
->wbsize
* sizeof (int));
853 /* prompt_invis_chars_first_line is the number of invisible characters in
854 the first physical line of the prompt.
855 wrap_offset - prompt_invis_chars_first_line is usually the number of
856 invis chars on the second (or, more generally, last) line. */
858 /* This is zero-based, used to set the newlines */
859 prompt_lines_estimate
= lpos
/ _rl_screenwidth
;
861 /* what if lpos is already >= _rl_screenwidth before we start drawing the
862 contents of the command line? */
863 if (lpos
>= _rl_screenwidth
)
867 /* first copy the linebreaks array we computed in expand_prompt */
868 while (local_prompt_newlines
[newlines
+1] != -1)
870 temp
= local_prompt_newlines
[newlines
+1];
871 inv_lbreaks
[++newlines
] = temp
;
874 /* Now set lpos from the last newline */
875 if (mb_cur_max
> 1 && rl_byte_oriented
== 0 && prompt_multibyte_chars
> 0)
876 lpos
= _rl_col_width (local_prompt
, temp
, local_prompt_len
, 1) - (wrap_offset
- prompt_invis_chars_first_line
);
878 lpos
-= (_rl_screenwidth
* newlines
);
881 prompt_last_screen_line
= newlines
;
883 /* Draw the rest of the line (after the prompt) into invisible_line, keeping
884 track of where the cursor is (cpos_buffer_position), the number of the
885 line containing the cursor (lb_linenum), the last line number (lb_botlin
887 It maintains an array of line breaks for display (inv_lbreaks).
888 This handles expanding tabs for display and displaying meta characters. */
890 #if defined (HANDLE_MULTIBYTE)
892 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
894 memset (&ps
, 0, sizeof (mbstate_t));
895 if (_rl_utf8locale
&& UTF8_SINGLEBYTE(rl_line_buffer
[0]))
897 wc
= (wchar_t)rl_line_buffer
[0];
901 wc_bytes
= mbrtowc (&wc
, rl_line_buffer
, rl_end
, &ps
);
907 for (in
= 0; in
< rl_end
; in
++)
910 c
= (unsigned char)rl_line_buffer
[in
];
912 #if defined (HANDLE_MULTIBYTE)
913 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
915 if (MB_INVALIDCH (wc_bytes
))
917 /* Byte sequence is invalid or shortened. Assume that the
918 first byte represents a character. */
920 /* Assume that a character occupies a single column. */
922 memset (&ps
, 0, sizeof (mbstate_t));
924 else if (MB_NULLWCH (wc_bytes
))
925 break; /* Found '\0' */
929 wc_width
= (temp
>= 0) ? temp
: 1;
934 if (out
+ 8 >= line_size
) /* XXX - 8 for \t */
937 visible_line
= (char *)xrealloc (visible_line
, line_size
);
938 invisible_line
= (char *)xrealloc (invisible_line
, line_size
);
939 line
= invisible_line
;
944 cpos_buffer_position
= out
;
945 lb_linenum
= newlines
;
948 #if defined (HANDLE_MULTIBYTE)
949 if (META_CHAR (c
) && _rl_output_meta_chars
== 0) /* XXX - clean up */
954 if (_rl_output_meta_chars
== 0)
956 sprintf (line
+ out
, "\\%o", c
);
958 if (lpos
+ 4 >= _rl_screenwidth
)
960 temp
= _rl_screenwidth
- lpos
;
961 CHECK_INV_LBREAKS ();
962 inv_lbreaks
[++newlines
] = out
+ temp
;
963 #if defined (HANDLE_MULTIBYTE)
964 line_state_invisible
->wrapped_line
[newlines
] = _rl_wrapped_multicolumn
;
979 #if defined (DISPLAY_TABS)
985 newout
= (out
| (int)7) + 1;
987 newout
= out
+ 8 - lpos
% 8;
990 if (lpos
+ temp
>= _rl_screenwidth
)
993 temp2
= _rl_screenwidth
- lpos
;
994 CHECK_INV_LBREAKS ();
995 inv_lbreaks
[++newlines
] = out
+ temp2
;
996 #if defined (HANDLE_MULTIBYTE)
997 line_state_invisible
->wrapped_line
[newlines
] = _rl_wrapped_multicolumn
;
1000 while (out
< newout
)
1005 while (out
< newout
)
1011 else if (c
== '\n' && _rl_horizontal_scroll_mode
== 0 && _rl_term_up
&& *_rl_term_up
)
1013 line
[out
++] = '\0'; /* XXX - sentinel */
1014 CHECK_INV_LBREAKS ();
1015 inv_lbreaks
[++newlines
] = out
;
1016 #if defined (HANDLE_MULTIBYTE)
1017 line_state_invisible
->wrapped_line
[newlines
] = _rl_wrapped_multicolumn
;
1021 else if (CTRL_CHAR (c
) || c
== RUBOUT
)
1025 line
[out
++] = CTRL_CHAR (c
) ? UNCTRL (c
) : '?';
1030 #if defined (HANDLE_MULTIBYTE)
1031 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1035 _rl_wrapped_multicolumn
= 0;
1037 if (_rl_screenwidth
< lpos
+ wc_width
)
1038 for (i
= lpos
; i
< _rl_screenwidth
; i
++)
1040 /* The space will be removed in update_line() */
1042 _rl_wrapped_multicolumn
++;
1047 cpos_buffer_position
= out
;
1048 lb_linenum
= newlines
;
1050 for (i
= in
; i
< in
+wc_bytes
; i
++)
1051 line
[out
++] = rl_line_buffer
[i
];
1052 for (i
= 0; i
< wc_width
; i
++)
1066 #if defined (HANDLE_MULTIBYTE)
1067 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1070 if (_rl_utf8locale
&& UTF8_SINGLEBYTE(rl_line_buffer
[in
]))
1072 wc
= (wchar_t)rl_line_buffer
[in
];
1074 memset (&ps
, 0, sizeof (mbstate_t)); /* re-init state */
1077 wc_bytes
= mbrtowc (&wc
, rl_line_buffer
+ in
, rl_end
- in
, &ps
);
1084 line_totbytes
= out
;
1085 if (cpos_buffer_position
< 0)
1087 cpos_buffer_position
= out
;
1088 lb_linenum
= newlines
;
1091 inv_botlin
= lb_botlin
= _rl_inv_botlin
= newlines
;
1092 CHECK_INV_LBREAKS ();
1093 inv_lbreaks
[newlines
+1] = out
;
1094 #if defined (HANDLE_MULTIBYTE)
1095 /* This should be 0 anyway */
1096 line_state_invisible
->wrapped_line
[newlines
+1] = _rl_wrapped_multicolumn
;
1098 cursor_linenum
= lb_linenum
;
1100 /* CPOS_BUFFER_POSITION == position in buffer where cursor should be placed.
1101 CURSOR_LINENUM == line number where the cursor should be placed. */
1103 /* PWP: now is when things get a bit hairy. The visible and invisible
1104 line buffers are really multiple lines, which would wrap every
1105 (screenwidth - 1) characters. Go through each in turn, finding
1106 the changed region and updating it. The line order is top to bottom. */
1108 /* If we can move the cursor up and down, then use multiple lines,
1109 otherwise, let long lines display in a single terminal line, and
1110 horizontally scroll it. */
1111 displaying_prompt_first_line
= 1;
1112 if (_rl_horizontal_scroll_mode
== 0 && _rl_term_up
&& *_rl_term_up
)
1114 int nleft
, pos
, changed_screen_line
, tx
;
1116 if (!rl_display_fixed
|| forced_display
)
1120 /* If we have more than a screenful of material to display, then
1121 only display a screenful. We should display the last screen,
1123 if (out
>= _rl_screenchars
)
1125 #if defined (HANDLE_MULTIBYTE)
1126 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1127 out
= _rl_find_prev_mbchar (line
, _rl_screenchars
, MB_FIND_ANY
);
1130 out
= _rl_screenchars
- 1;
1133 /* The first line is at character position 0 in the buffer. The
1134 second and subsequent lines start at inv_lbreaks[N], offset by
1135 OFFSET (which has already been calculated above). */
1137 #define INVIS_FIRST() (prompt_physical_chars > _rl_screenwidth ? prompt_invis_chars_first_line : wrap_offset)
1138 #define WRAP_OFFSET(line, offset) ((line == 0) \
1139 ? (offset ? INVIS_FIRST() : 0) \
1140 : ((line == prompt_last_screen_line) ? wrap_offset-prompt_invis_chars_first_line : 0))
1141 #define W_OFFSET(line, offset) ((line) == 0 ? offset : 0)
1142 #define VIS_LLEN(l) ((l) > _rl_vis_botlin ? 0 : (vis_lbreaks[l+1] - vis_lbreaks[l]))
1143 #define INV_LLEN(l) (inv_lbreaks[l+1] - inv_lbreaks[l])
1144 #define VIS_CHARS(line) (visible_line + vis_lbreaks[line])
1145 #define VIS_LINE(line) ((line) > _rl_vis_botlin) ? "" : VIS_CHARS(line)
1146 #define INV_LINE(line) (invisible_line + inv_lbreaks[line])
1148 #define OLD_CPOS_IN_PROMPT() (cpos_adjusted == 0 && \
1149 _rl_last_c_pos != o_cpos && \
1150 _rl_last_c_pos > wrap_offset && \
1151 o_cpos < prompt_last_invisible)
1153 /* For each line in the buffer, do the updating display. */
1154 for (linenum
= 0; linenum
<= inv_botlin
; linenum
++)
1156 /* This can lead us astray if we execute a program that changes
1157 the locale from a non-multibyte to a multibyte one. */
1158 o_cpos
= _rl_last_c_pos
;
1160 update_line (VIS_LINE(linenum
), INV_LINE(linenum
), linenum
,
1161 VIS_LLEN(linenum
), INV_LLEN(linenum
), inv_botlin
);
1163 /* update_line potentially changes _rl_last_c_pos, but doesn't
1164 take invisible characters into account, since _rl_last_c_pos
1165 is an absolute cursor position in a multibyte locale. We
1166 choose to (mostly) compensate for that here, rather than
1167 change update_line itself. There are several cases in which
1168 update_line adjusts _rl_last_c_pos itself (so it can pass
1169 _rl_move_cursor_relative accurate values); it communicates
1170 this back by setting cpos_adjusted. If we assume that
1171 _rl_last_c_pos is correct (an absolute cursor position) each
1172 time update_line is called, then we can assume in our
1173 calculations that o_cpos does not need to be adjusted by
1175 if (linenum
== 0 && (mb_cur_max
> 1 && rl_byte_oriented
== 0) && OLD_CPOS_IN_PROMPT())
1176 _rl_last_c_pos
-= prompt_invis_chars_first_line
; /* XXX - was wrap_offset */
1177 else if (cpos_adjusted
== 0 &&
1178 linenum
== prompt_last_screen_line
&&
1179 prompt_physical_chars
> _rl_screenwidth
&&
1180 (mb_cur_max
> 1 && rl_byte_oriented
== 0) &&
1181 _rl_last_c_pos
!= o_cpos
&&
1182 _rl_last_c_pos
> (prompt_last_invisible
- _rl_screenwidth
- prompt_invis_chars_first_line
)) /* XXX - rethink this last one */
1183 /* This assumes that all the invisible characters are split
1184 between the first and last lines of the prompt, if the
1185 prompt consumes more than two lines. It's usually right */
1186 /* XXX - not sure this is ever executed */
1187 _rl_last_c_pos
-= (wrap_offset
-prompt_invis_chars_first_line
);
1189 /* If this is the line with the prompt, we might need to
1190 compensate for invisible characters in the new line. Do
1191 this only if there is not more than one new line (which
1192 implies that we completely overwrite the old visible line)
1193 and the new line is shorter than the old. Make sure we are
1194 at the end of the new line before clearing. */
1196 inv_botlin
== 0 && _rl_last_c_pos
== out
&&
1197 (wrap_offset
> visible_wrap_offset
) &&
1198 (_rl_last_c_pos
< visible_first_line_len
))
1200 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1201 nleft
= _rl_screenwidth
- _rl_last_c_pos
;
1203 nleft
= _rl_screenwidth
+ wrap_offset
- _rl_last_c_pos
;
1205 _rl_clear_to_eol (nleft
);
1208 /* This segment is intended to handle the case where the prompt
1209 has invisible characters on the second line and the new line
1210 to be displayed needs to clear the rest of the old characters
1211 out (e.g., when printing the i-search prompt). In general,
1212 the case of the new line being shorter than the old.
1214 else if (linenum
== prompt_last_screen_line
&&
1215 prompt_physical_chars
> _rl_screenwidth
&&
1216 wrap_offset
!= prompt_invis_chars_first_line
&&
1217 _rl_last_c_pos
== out
&&
1221 /* Since the new first line is now visible, save its length. */
1223 visible_first_line_len
= (inv_botlin
> 0) ? inv_lbreaks
[1] : out
- wrap_offset
;
1226 /* We may have deleted some lines. If so, clear the left over
1227 blank ones at the bottom out. */
1228 if (_rl_vis_botlin
> inv_botlin
)
1231 for (; linenum
<= _rl_vis_botlin
; linenum
++)
1233 tt
= VIS_CHARS (linenum
);
1234 _rl_move_vert (linenum
);
1235 _rl_move_cursor_relative (0, tt
);
1237 ((linenum
== _rl_vis_botlin
) ? strlen (tt
) : _rl_screenwidth
);
1240 _rl_vis_botlin
= inv_botlin
;
1242 /* CHANGED_SCREEN_LINE is set to 1 if we have moved to a
1243 different screen line during this redisplay. */
1244 changed_screen_line
= _rl_last_v_pos
!= cursor_linenum
;
1245 if (changed_screen_line
)
1247 _rl_move_vert (cursor_linenum
);
1248 /* If we moved up to the line with the prompt using _rl_term_up,
1249 the physical cursor position on the screen stays the same,
1250 but the buffer position needs to be adjusted to account
1251 for invisible characters. */
1252 if ((mb_cur_max
== 1 || rl_byte_oriented
) && cursor_linenum
== 0 && wrap_offset
)
1253 _rl_last_c_pos
+= wrap_offset
;
1256 /* Now we move the cursor to where it needs to be. First, make
1257 sure we are on the correct line (cursor_linenum). */
1259 /* We have to reprint the prompt if it contains invisible
1260 characters, since it's not generally OK to just reprint
1261 the characters from the current cursor position. But we
1262 only need to reprint it if the cursor is before the last
1263 invisible character in the prompt string. */
1264 nleft
= prompt_visible_length
+ wrap_offset
;
1265 if (cursor_linenum
== 0 && wrap_offset
> 0 && _rl_last_c_pos
> 0 &&
1267 _rl_last_c_pos
<= PROMPT_ENDING_INDEX
&& local_prompt
)
1269 _rl_last_c_pos
< PROMPT_ENDING_INDEX
&& local_prompt
)
1272 #if defined (__MSDOS__)
1273 putc ('\r', rl_outstream
);
1276 tputs (_rl_term_cr
, 1, _rl_output_character_function
);
1279 _rl_output_some_chars ("*", 1);
1281 _rl_output_some_chars (local_prompt
, nleft
);
1282 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1283 _rl_last_c_pos
= _rl_col_width (local_prompt
, 0, nleft
, 1) - wrap_offset
+ modmark
;
1285 _rl_last_c_pos
= nleft
+ modmark
;
1288 /* Where on that line? And where does that line start
1290 pos
= inv_lbreaks
[cursor_linenum
];
1291 /* nleft == number of characters in the line buffer between the
1292 start of the line and the desired cursor position. */
1293 nleft
= cpos_buffer_position
- pos
;
1295 /* NLEFT is now a number of characters in a buffer. When in a
1296 multibyte locale, however, _rl_last_c_pos is an absolute cursor
1297 position that doesn't take invisible characters in the prompt
1298 into account. We use a fudge factor to compensate. */
1300 /* Since _rl_backspace() doesn't know about invisible characters in
1301 the prompt, and there's no good way to tell it, we compensate for
1302 those characters here and call _rl_backspace() directly if
1304 if (wrap_offset
&& cursor_linenum
== 0 && nleft
< _rl_last_c_pos
)
1306 /* TX == new physical cursor position in multibyte locale. */
1307 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1308 tx
= _rl_col_width (&visible_line
[pos
], 0, nleft
, 1) - visible_wrap_offset
;
1311 if (tx
>= 0 && _rl_last_c_pos
> tx
)
1313 _rl_backspace (_rl_last_c_pos
- tx
); /* XXX */
1314 _rl_last_c_pos
= tx
;
1318 /* We need to note that in a multibyte locale we are dealing with
1319 _rl_last_c_pos as an absolute cursor position, but moving to a
1320 point specified by a buffer position (NLEFT) that doesn't take
1321 invisible characters into account. */
1322 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1323 _rl_move_cursor_relative (nleft
, &invisible_line
[pos
]);
1324 else if (nleft
!= _rl_last_c_pos
)
1325 _rl_move_cursor_relative (nleft
, &invisible_line
[pos
]);
1328 else /* Do horizontal scrolling. Much simpler */
1330 #define M_OFFSET(margin, offset) ((margin) == 0 ? offset : 0)
1331 int lmargin
, ndisp
, nleft
, phys_c_pos
, t
;
1333 /* Always at top line. */
1336 /* Compute where in the buffer the displayed line should start. This
1339 /* The number of characters that will be displayed before the cursor. */
1340 ndisp
= cpos_buffer_position
- wrap_offset
;
1341 nleft
= prompt_visible_length
+ wrap_offset
;
1342 /* Where the new cursor position will be on the screen. This can be
1343 longer than SCREENWIDTH; if it is, lmargin will be adjusted. */
1344 phys_c_pos
= cpos_buffer_position
- (last_lmargin
? last_lmargin
: wrap_offset
);
1345 t
= _rl_screenwidth
/ 3;
1347 /* If the number of characters had already exceeded the screenwidth,
1348 last_lmargin will be > 0. */
1350 /* If the number of characters to be displayed is more than the screen
1351 width, compute the starting offset so that the cursor is about
1352 two-thirds of the way across the screen. */
1353 if (phys_c_pos
> _rl_screenwidth
- 2)
1355 lmargin
= cpos_buffer_position
- (2 * t
);
1358 /* If the left margin would be in the middle of a prompt with
1359 invisible characters, don't display the prompt at all. */
1360 if (wrap_offset
&& lmargin
> 0 && lmargin
< nleft
)
1363 else if (ndisp
< _rl_screenwidth
- 2) /* XXX - was -1 */
1365 else if (phys_c_pos
< 1)
1367 /* If we are moving back towards the beginning of the line and
1368 the last margin is no longer correct, compute a new one. */
1369 lmargin
= ((cpos_buffer_position
- 1) / t
) * t
; /* XXX */
1370 if (wrap_offset
&& lmargin
> 0 && lmargin
< nleft
)
1374 lmargin
= last_lmargin
;
1376 displaying_prompt_first_line
= lmargin
< nleft
;
1378 /* If the first character on the screen isn't the first character
1379 in the display line, indicate this with a special character. */
1381 line
[lmargin
] = '<';
1383 /* If SCREENWIDTH characters starting at LMARGIN do not encompass
1384 the whole line, indicate that with a special character at the
1385 right edge of the screen. If LMARGIN is 0, we need to take the
1386 wrap offset into account. */
1387 t
= lmargin
+ M_OFFSET (lmargin
, wrap_offset
) + _rl_screenwidth
;
1388 if (t
> 0 && t
< out
)
1391 if (rl_display_fixed
== 0 || forced_display
|| lmargin
!= last_lmargin
)
1394 o_cpos
= _rl_last_c_pos
;
1396 update_line (&visible_line
[last_lmargin
],
1397 &invisible_line
[lmargin
],
1399 _rl_screenwidth
+ visible_wrap_offset
,
1400 _rl_screenwidth
+ (lmargin
? 0 : wrap_offset
),
1403 if ((mb_cur_max
> 1 && rl_byte_oriented
== 0) &&
1404 displaying_prompt_first_line
&& OLD_CPOS_IN_PROMPT())
1405 _rl_last_c_pos
-= prompt_invis_chars_first_line
; /* XXX - was wrap_offset */
1407 /* If the visible new line is shorter than the old, but the number
1408 of invisible characters is greater, and we are at the end of
1409 the new line, we need to clear to eol. */
1410 t
= _rl_last_c_pos
- M_OFFSET (lmargin
, wrap_offset
);
1411 if ((M_OFFSET (lmargin
, wrap_offset
) > visible_wrap_offset
) &&
1412 (_rl_last_c_pos
== out
) && displaying_prompt_first_line
&&
1413 t
< visible_first_line_len
)
1415 nleft
= _rl_screenwidth
- t
;
1416 _rl_clear_to_eol (nleft
);
1418 visible_first_line_len
= out
- lmargin
- M_OFFSET (lmargin
, wrap_offset
);
1419 if (visible_first_line_len
> _rl_screenwidth
)
1420 visible_first_line_len
= _rl_screenwidth
;
1422 _rl_move_cursor_relative (cpos_buffer_position
- lmargin
, &invisible_line
[lmargin
]);
1423 last_lmargin
= lmargin
;
1426 fflush (rl_outstream
);
1428 /* Swap visible and non-visible lines. */
1430 struct line_state
*vtemp
= line_state_visible
;
1432 line_state_visible
= line_state_invisible
;
1433 line_state_invisible
= vtemp
;
1435 rl_display_fixed
= 0;
1436 /* If we are displaying on a single line, and last_lmargin is > 0, we
1437 are not displaying any invisible characters, so set visible_wrap_offset
1439 if (_rl_horizontal_scroll_mode
&& last_lmargin
)
1440 visible_wrap_offset
= 0;
1442 visible_wrap_offset
= wrap_offset
;
1445 RL_UNSETSTATE (RL_STATE_REDISPLAYING
);
1446 _rl_release_sigint ();
1449 /* PWP: update_line() is based on finding the middle difference of each
1450 line on the screen; vis:
1452 /old first difference
1453 /beginning of line | /old last same /old EOL
1455 old: eddie> Oh, my little gruntle-buggy is to me, as lurgid as
1456 new: eddie> Oh, my little buggy says to me, as lurgid as
1458 \beginning of line | \new last same \new end of line
1459 \new first difference
1461 All are character pointers for the sake of speed. Special cases for
1462 no differences, as well as for end of line additions must be handled.
1464 Could be made even smarter, but this works well enough */
1466 update_line (char *old
, char *new, int current_line
, int omax
, int nmax
, int inv_botlin
)
1468 register char *ofd
, *ols
, *oe
, *nfd
, *nls
, *ne
;
1469 int temp
, lendiff
, wsatend
, od
, nd
, twidth
, o_cpos
;
1470 int current_invis_chars
;
1471 int col_lendiff
, col_temp
;
1472 int bytes_to_insert
;
1473 int mb_cur_max
= MB_CUR_MAX
;
1474 #if defined (HANDLE_MULTIBYTE)
1475 mbstate_t ps_new
, ps_old
;
1476 int new_offset
, old_offset
;
1479 /* If we're at the right edge of a terminal that supports xn, we're
1480 ready to wrap around, so do so. This fixes problems with knowing
1481 the exact cursor position and cut-and-paste with certain terminal
1482 emulators. In this calculation, TEMP is the physical screen
1483 position of the cursor. */
1484 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1485 temp
= _rl_last_c_pos
;
1487 temp
= _rl_last_c_pos
- WRAP_OFFSET (_rl_last_v_pos
, visible_wrap_offset
);
1488 if (temp
== _rl_screenwidth
&& _rl_term_autowrap
&& !_rl_horizontal_scroll_mode
1489 && _rl_last_v_pos
== current_line
- 1)
1491 /* We're going to wrap around by writing the first character of NEW to
1492 the screen and dealing with changes to what's visible by modifying
1493 OLD to match it. Complicated by the presence of multi-width
1494 characters at the end of the line or beginning of the new one. */
1495 /* old is always somewhere in visible_line; new is always somewhere in
1496 invisible_line. These should always be null-terminated. */
1497 #if defined (HANDLE_MULTIBYTE)
1498 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1502 int oldwidth
, newwidth
;
1503 int oldbytes
, newbytes
;
1506 /* This fixes only double-column characters, but if the wrapped
1507 character consumes more than three columns, spaces will be
1508 inserted in the string buffer. */
1509 /* XXX remember that we are working on the invisible line right now;
1510 we don't swap visible and invisible until just before rl_redisplay
1512 /* This will remove the extra placeholder space we added with
1513 _rl_wrapped_multicolumn */
1514 if (current_line
< line_state_invisible
->wbsize
&& line_state_invisible
->wrapped_line
[current_line
] > 0)
1515 _rl_clear_to_eol (line_state_invisible
->wrapped_line
[current_line
]);
1517 /* 1. how many screen positions does first char in old consume? */
1518 memset (&ps
, 0, sizeof (mbstate_t));
1519 ret
= mbrtowc (&wc
, old
, mb_cur_max
, &ps
);
1521 if (MB_INVALIDCH (ret
))
1526 else if (MB_NULLWCH (ret
))
1529 oldwidth
= WCWIDTH (wc
);
1533 /* 2. how many screen positions does the first char in new consume? */
1534 memset (&ps
, 0, sizeof (mbstate_t));
1535 ret
= mbrtowc (&wc
, new, mb_cur_max
, &ps
);
1537 if (MB_INVALIDCH (ret
))
1542 else if (MB_NULLWCH (ret
))
1545 newwidth
= WCWIDTH (wc
);
1549 /* 3. if the new width is less than the old width, we need to keep
1550 going in new until we have consumed at least that many screen
1551 positions, and figure out how many bytes that will take */
1552 while (newbytes
< nmax
&& newwidth
< oldwidth
)
1556 ret
= mbrtowc (&wc
, new+newbytes
, mb_cur_max
, &ps
);
1557 if (MB_INVALIDCH (ret
))
1562 else if (MB_NULLWCH (ret
))
1567 newwidth
+= (t
>= 0) ? t
: 1;
1571 /* 4. If the new width is more than the old width, keep going in old
1572 until we have consumed exactly that many screen positions, and
1573 figure out how many bytes that will take. This is an optimization */
1574 while (oldbytes
< omax
&& oldwidth
< newwidth
)
1578 ret
= mbrtowc (&wc
, old
+oldbytes
, mb_cur_max
, &ps
);
1579 if (MB_INVALIDCH (ret
))
1584 else if (MB_NULLWCH (ret
))
1589 oldwidth
+= (t
>= 0) ? t
: 1;
1593 /* 5. write the first newbytes of new, which takes newwidth. This is
1594 where the screen wrapping takes place, and we are now writing
1595 characters onto the new line. We need to fix up old so it
1596 accurately reflects what is on the screen after the
1597 _rl_output_some_chars below. */
1603 _rl_output_some_chars (new, newbytes
);
1604 _rl_last_c_pos
= newwidth
;
1607 /* 5a. If the number of screen positions doesn't match, punt
1608 and do a dumb update. */
1609 if (newwidth
!= oldwidth
)
1616 if (oldbytes
!= 0 && newbytes
!= 0)
1618 /* We have written as many bytes from new as we need to
1619 consume the first character of old. Fix up `old' so it
1620 reflects the new screen contents. We use +1 in the
1621 memmove call to copy the trailing NUL. */
1622 memmove (old
+newbytes
, old
+oldbytes
, strlen (old
+oldbytes
) + 1);
1623 memcpy (old
, new, newbytes
);
1624 j
= newbytes
- oldbytes
;
1627 /* Fix up indices if we copy data from one line to another */
1628 for (i
= current_line
+1; i
<= inv_botlin
+1; i
++)
1629 vis_lbreaks
[i
] += j
;
1634 putc (' ', rl_outstream
);
1637 if (old
[0] && new[0])
1645 putc (new[0], rl_outstream
);
1647 putc (' ', rl_outstream
);
1650 if (old
[0] && new[0])
1655 /* Find first difference. */
1656 #if defined (HANDLE_MULTIBYTE)
1657 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1659 /* See if the old line is a subset of the new line, so that the
1660 only change is adding characters. */
1661 temp
= (omax
< nmax
) ? omax
: nmax
;
1662 if (memcmp (old
, new, temp
) == 0) /* adding at the end */
1664 new_offset
= old_offset
= temp
;
1670 memset (&ps_new
, 0, sizeof(mbstate_t));
1671 memset (&ps_old
, 0, sizeof(mbstate_t));
1673 /* Are the old and new lines the same? */
1674 if (omax
== nmax
&& STREQN (new, old
, omax
))
1683 /* Go through the line from the beginning and find the first
1685 new_offset
= old_offset
= 0;
1686 for (ofd
= old
, nfd
= new;
1687 (ofd
- old
< omax
) && *ofd
&&
1688 _rl_compare_chars(old
, old_offset
, &ps_old
, new, new_offset
, &ps_new
); )
1690 old_offset
= _rl_find_next_mbchar (old
, old_offset
, 1, MB_FIND_ANY
);
1691 new_offset
= _rl_find_next_mbchar (new, new_offset
, 1, MB_FIND_ANY
);
1693 ofd
= old
+ old_offset
;
1694 nfd
= new + new_offset
;
1701 for (ofd
= old
, nfd
= new;
1702 (ofd
- old
< omax
) && *ofd
&& (*ofd
== *nfd
);
1706 /* Move to the end of the screen line. ND and OD are used to keep track
1707 of the distance between ne and new and oe and old, respectively, to
1708 move a subtraction out of each loop. */
1709 for (od
= ofd
- old
, oe
= ofd
; od
< omax
&& *oe
; oe
++, od
++);
1710 for (nd
= nfd
- new, ne
= nfd
; nd
< nmax
&& *ne
; ne
++, nd
++);
1712 /* If no difference, continue to next line. */
1713 if (ofd
== oe
&& nfd
== ne
)
1716 #if defined (HANDLE_MULTIBYTE)
1717 if (mb_cur_max
> 1 && rl_byte_oriented
== 0 && _rl_utf8locale
)
1720 mbstate_t ps
= { 0 };
1723 /* If the first character in the difference is a zero-width character,
1724 assume it's a combining character and back one up so the two base
1725 characters no longer compare equivalently. */
1726 t
= mbrtowc (&wc
, ofd
, mb_cur_max
, &ps
);
1727 if (t
> 0 && UNICODE_COMBINING_CHAR (wc
) && WCWIDTH (wc
) == 0)
1729 old_offset
= _rl_find_prev_mbchar (old
, ofd
- old
, MB_FIND_ANY
);
1730 new_offset
= _rl_find_prev_mbchar (new, nfd
- new, MB_FIND_ANY
);
1731 ofd
= old
+ old_offset
; /* equal by definition */
1732 nfd
= new + new_offset
;
1737 wsatend
= 1; /* flag for trailing whitespace */
1739 #if defined (HANDLE_MULTIBYTE)
1740 /* Find the last character that is the same between the two lines. This
1741 bounds the region that needs to change. */
1742 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1744 ols
= old
+ _rl_find_prev_mbchar (old
, oe
- old
, MB_FIND_ANY
);
1745 nls
= new + _rl_find_prev_mbchar (new, ne
- new, MB_FIND_ANY
);
1747 while ((ols
> ofd
) && (nls
> nfd
))
1749 memset (&ps_old
, 0, sizeof (mbstate_t));
1750 memset (&ps_new
, 0, sizeof (mbstate_t));
1753 /* On advice from jir@yamato.ibm.com */
1754 _rl_adjust_point (old
, ols
- old
, &ps_old
);
1755 _rl_adjust_point (new, nls
- new, &ps_new
);
1758 if (_rl_compare_chars (old
, ols
- old
, &ps_old
, new, nls
- new, &ps_new
) == 0)
1764 ols
= old
+ _rl_find_prev_mbchar (old
, ols
- old
, MB_FIND_ANY
);
1765 nls
= new + _rl_find_prev_mbchar (new, nls
- new, MB_FIND_ANY
);
1770 #endif /* HANDLE_MULTIBYTE */
1771 ols
= oe
- 1; /* find last same */
1773 while ((ols
> ofd
) && (nls
> nfd
) && (*ols
== *nls
))
1780 #if defined (HANDLE_MULTIBYTE)
1789 #if defined (HANDLE_MULTIBYTE)
1790 /* This may not work for stateful encoding, but who cares? To handle
1791 stateful encoding properly, we have to scan each string from the
1792 beginning and compare. */
1793 else if (_rl_compare_chars (ols
, 0, NULL
, nls
, 0, NULL
) == 0)
1795 else if (*ols
!= *nls
)
1798 if (*ols
) /* don't step past the NUL */
1800 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1801 ols
= old
+ _rl_find_next_mbchar (old
, ols
- old
, 1, MB_FIND_ANY
);
1807 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1808 nls
= new + _rl_find_next_mbchar (new, nls
- new, 1, MB_FIND_ANY
);
1814 /* count of invisible characters in the current invisible line. */
1815 current_invis_chars
= W_OFFSET (current_line
, wrap_offset
);
1816 if (_rl_last_v_pos
!= current_line
)
1818 _rl_move_vert (current_line
);
1819 /* We have moved up to a new screen line. This line may or may not have
1820 invisible characters on it, but we do our best to recalculate
1821 visible_wrap_offset based on what we know. */
1822 if (current_line
== 0)
1823 visible_wrap_offset
= prompt_invis_chars_first_line
; /* XXX */
1824 if ((mb_cur_max
== 1 || rl_byte_oriented
) && current_line
== 0 && visible_wrap_offset
)
1825 _rl_last_c_pos
+= visible_wrap_offset
;
1828 /* If this is the first line and there are invisible characters in the
1829 prompt string, and the prompt string has not changed, and the current
1830 cursor position is before the last invisible character in the prompt,
1831 and the index of the character to move to is past the end of the prompt
1832 string, then redraw the entire prompt string. We can only do this
1833 reliably if the terminal supports a `cr' capability.
1835 This can also happen if the prompt string has changed, and the first
1836 difference in the line is in the middle of the prompt string, after a
1837 sequence of invisible characters (worst case) and before the end of
1838 the prompt. In this case, we have to redraw the entire prompt string
1839 so that the entire sequence of invisible characters is drawn. We need
1840 to handle the worst case, when the difference is after (or in the middle
1841 of) a sequence of invisible characters that changes the text color and
1842 before the sequence that restores the text color to normal. Then we have
1843 to make sure that the lines still differ -- if they don't, we can
1846 This is not an efficiency hack -- there is a problem with redrawing
1847 portions of the prompt string if they contain terminal escape
1848 sequences (like drawing the `unbold' sequence without a corresponding
1849 `bold') that manifests itself on certain terminals. */
1851 lendiff
= local_prompt_len
;
1854 od
= ofd
- old
; /* index of first difference in visible line */
1855 nd
= nfd
- new; /* nd, od are buffer indexes */
1856 if (current_line
== 0 && !_rl_horizontal_scroll_mode
&&
1857 _rl_term_cr
&& lendiff
> prompt_visible_length
&& _rl_last_c_pos
> 0 &&
1858 (((od
> 0 || nd
> 0) && (od
<= prompt_last_invisible
|| nd
<= prompt_last_invisible
)) ||
1859 ((od
>= lendiff
) && _rl_last_c_pos
< PROMPT_ENDING_INDEX
)))
1861 #if defined (__MSDOS__)
1862 putc ('\r', rl_outstream
);
1864 tputs (_rl_term_cr
, 1, _rl_output_character_function
);
1867 _rl_output_some_chars ("*", 1);
1868 _rl_output_some_chars (local_prompt
, lendiff
);
1869 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1871 /* We take wrap_offset into account here so we can pass correct
1872 information to _rl_move_cursor_relative. */
1873 _rl_last_c_pos
= _rl_col_width (local_prompt
, 0, lendiff
, 1) - wrap_offset
+ modmark
;
1877 _rl_last_c_pos
= lendiff
+ modmark
;
1879 /* Now if we have printed the prompt string because the first difference
1880 was within the prompt, see if we need to recompute where the lines
1881 differ. Check whether where we are now is past the last place where
1882 the old and new lines are the same and short-circuit now if we are. */
1883 if ((od
<= prompt_last_invisible
|| nd
<= prompt_last_invisible
) &&
1885 lendiff
> (ols
-old
) && lendiff
> (nls
-new))
1888 /* XXX - we need to fix up our calculations if we are now past the
1889 old ofd/nfd and the prompt length (or line length) has changed.
1890 We punt on the problem and do a dumb update. We'd like to be able
1891 to just output the prompt from the beginning of the line up to the
1892 first difference, but you don't know the number of invisible
1893 characters in that case.
1894 This needs a lot of work to be efficient. */
1895 if ((od
<= prompt_last_invisible
|| nd
<= prompt_last_invisible
))
1897 nfd
= new + lendiff
; /* number of characters we output above */
1900 /* Do a dumb update and return */
1905 _rl_output_some_chars (nfd
, temp
);
1906 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1908 _rl_last_c_pos
+= _rl_col_width (new, nd
, ne
- new, 1);
1909 /* Need to adjust here based on wrap_offset. Guess that if
1910 this is the line containing the last line of the prompt
1911 we need to adjust by
1912 wrap_offset-prompt_invis_chars_first_line
1913 on the assumption that this is the number of invisible
1914 characters in the last line of the prompt. */
1915 if (wrap_offset
> prompt_invis_chars_first_line
&&
1916 current_line
== prompt_last_screen_line
&&
1917 prompt_physical_chars
> _rl_screenwidth
&&
1918 _rl_horizontal_scroll_mode
== 0)
1920 _rl_last_c_pos
-= wrap_offset
- prompt_invis_chars_first_line
;
1925 _rl_last_c_pos
+= temp
;
1928 goto clear_rest_of_line
; /* XXX */
1934 o_cpos
= _rl_last_c_pos
;
1936 /* When this function returns, _rl_last_c_pos is correct, and an absolute
1937 cursor position in multibyte mode, but a buffer index when not in a
1938 multibyte locale. */
1939 _rl_move_cursor_relative (od
, old
);
1941 #if defined (HANDLE_MULTIBYTE)
1942 /* We need to indicate that the cursor position is correct in the presence of
1943 invisible characters in the prompt string. Let's see if setting this when
1944 we make sure we're at the end of the drawn prompt string works. */
1945 if (current_line
== 0 && mb_cur_max
> 1 && rl_byte_oriented
== 0 &&
1946 (_rl_last_c_pos
> 0 || o_cpos
> 0) &&
1947 _rl_last_c_pos
== prompt_physical_chars
)
1951 /* if (len (new) > len (old))
1952 lendiff == difference in buffer (bytes)
1953 col_lendiff == difference on screen (columns)
1954 When not using multibyte characters, these are equal */
1955 lendiff
= (nls
- nfd
) - (ols
- ofd
);
1956 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1957 col_lendiff
= _rl_col_width (new, nfd
- new, nls
- new, 1) - _rl_col_width (old
, ofd
- old
, ols
- old
, 1);
1959 col_lendiff
= lendiff
;
1961 /* If we are changing the number of invisible characters in a line, and
1962 the spot of first difference is before the end of the invisible chars,
1963 lendiff needs to be adjusted. */
1964 if (current_line
== 0 && /* !_rl_horizontal_scroll_mode && */
1965 current_invis_chars
!= visible_wrap_offset
)
1967 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1969 lendiff
+= visible_wrap_offset
- current_invis_chars
;
1970 col_lendiff
+= visible_wrap_offset
- current_invis_chars
;
1974 lendiff
+= visible_wrap_offset
- current_invis_chars
;
1975 col_lendiff
= lendiff
;
1979 /* We use temp as a count of the number of bytes from the first difference
1980 to the end of the new line. col_temp is the corresponding number of
1981 screen columns. A `dumb' update moves to the spot of first difference
1982 and writes TEMP bytes. */
1983 /* Insert (diff (len (old), len (new)) ch. */
1985 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
1986 col_temp
= _rl_col_width (new, nfd
- new, ne
- new, 1);
1990 /* how many bytes from the new line buffer to write to the display */
1991 bytes_to_insert
= nls
- nfd
;
1993 /* col_lendiff > 0 if we are adding characters to the line */
1994 if (col_lendiff
> 0) /* XXX - was lendiff */
1996 /* Non-zero if we're increasing the number of lines. */
1997 int gl
= current_line
>= _rl_vis_botlin
&& inv_botlin
> _rl_vis_botlin
;
1999 /* If col_lendiff is > 0, implying that the new string takes up more
2000 screen real estate than the old, but lendiff is < 0, meaning that it
2001 takes fewer bytes, we need to just output the characters starting
2002 from the first difference. These will overwrite what is on the
2003 display, so there's no reason to do a smart update. This can really
2004 only happen in a multibyte environment. */
2007 _rl_output_some_chars (nfd
, temp
);
2008 _rl_last_c_pos
+= col_temp
; /* XXX - was _rl_col_width (nfd, 0, temp, 1); */
2009 /* If nfd begins before any invisible characters in the prompt,
2010 adjust _rl_last_c_pos to account for wrap_offset and set
2011 cpos_adjusted to let the caller know. */
2012 if (current_line
== 0 && displaying_prompt_first_line
&& wrap_offset
&& ((nfd
- new) <= prompt_last_invisible
))
2014 _rl_last_c_pos
-= wrap_offset
; /* XXX - prompt_invis_chars_first_line? */
2019 /* Sometimes it is cheaper to print the characters rather than
2020 use the terminal's capabilities. If we're growing the number
2021 of lines, make sure we actually cause the new line to wrap
2022 around on auto-wrapping terminals. */
2023 else if (_rl_terminal_can_insert
&& ((2 * col_temp
) >= col_lendiff
|| _rl_term_IC
) && (!_rl_term_autowrap
|| !gl
))
2025 /* If lendiff > prompt_visible_length and _rl_last_c_pos == 0 and
2026 _rl_horizontal_scroll_mode == 1, inserting the characters with
2027 _rl_term_IC or _rl_term_ic will screw up the screen because of the
2028 invisible characters. We need to just draw them. */
2029 /* The same thing happens if we're trying to draw before the last
2030 invisible character in the prompt string or we're increasing the
2031 number of invisible characters in the line and we're not drawing
2032 the entire prompt string. */
2033 if (*ols
&& ((_rl_horizontal_scroll_mode
&&
2034 _rl_last_c_pos
== 0 &&
2035 lendiff
> prompt_visible_length
&&
2036 current_invis_chars
> 0) == 0) &&
2037 (((mb_cur_max
> 1 && rl_byte_oriented
== 0) &&
2038 current_line
== 0 && wrap_offset
&&
2039 ((nfd
- new) <= prompt_last_invisible
) &&
2040 (col_lendiff
< prompt_visible_length
)) == 0) &&
2041 (visible_wrap_offset
>= current_invis_chars
))
2043 open_some_spaces (col_lendiff
);
2044 _rl_output_some_chars (nfd
, bytes_to_insert
);
2045 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
2046 _rl_last_c_pos
+= _rl_col_width (nfd
, 0, bytes_to_insert
, 1);
2048 _rl_last_c_pos
+= bytes_to_insert
;
2050 else if ((mb_cur_max
== 1 || rl_byte_oriented
!= 0) && *ols
== 0 && lendiff
> 0)
2052 /* At the end of a line the characters do not have to
2053 be "inserted". They can just be placed on the screen. */
2054 _rl_output_some_chars (nfd
, temp
);
2055 _rl_last_c_pos
+= col_temp
;
2058 else /* just write from first difference to end of new line */
2060 _rl_output_some_chars (nfd
, temp
);
2061 _rl_last_c_pos
+= col_temp
;
2062 /* If nfd begins before the last invisible character in the
2063 prompt, adjust _rl_last_c_pos to account for wrap_offset
2064 and set cpos_adjusted to let the caller know. */
2065 if ((mb_cur_max
> 1 && rl_byte_oriented
== 0) && current_line
== 0 && displaying_prompt_first_line
&& wrap_offset
&& ((nfd
- new) <= prompt_last_invisible
))
2067 _rl_last_c_pos
-= wrap_offset
; /* XXX - prompt_invis_chars_first_line? */
2073 if (bytes_to_insert
> lendiff
)
2075 /* If nfd begins before the last invisible character in the
2076 prompt, adjust _rl_last_c_pos to account for wrap_offset
2077 and set cpos_adjusted to let the caller know. */
2078 if ((mb_cur_max
> 1 && rl_byte_oriented
== 0) && current_line
== 0 && displaying_prompt_first_line
&& wrap_offset
&& ((nfd
- new) <= prompt_last_invisible
))
2080 _rl_last_c_pos
-= wrap_offset
; /* XXX - prompt_invis_chars_first_line? */
2087 /* cannot insert chars, write to EOL */
2088 _rl_output_some_chars (nfd
, temp
);
2089 _rl_last_c_pos
+= col_temp
;
2090 /* If we're in a multibyte locale and were before the last invisible
2091 char in the current line (which implies we just output some invisible
2092 characters) we need to adjust _rl_last_c_pos, since it represents
2093 a physical character position. */
2094 /* The current_line*rl_screenwidth+prompt_invis_chars_first_line is a
2095 crude attempt to compute how far into the new line buffer we are.
2096 It doesn't work well in the face of multibyte characters and needs
2097 to be rethought. XXX */
2098 if ((mb_cur_max
> 1 && rl_byte_oriented
== 0) &&
2099 current_line
== prompt_last_screen_line
&& wrap_offset
&&
2100 displaying_prompt_first_line
&&
2101 wrap_offset
!= prompt_invis_chars_first_line
&&
2102 ((nfd
-new) < (prompt_last_invisible
-(current_line
*_rl_screenwidth
+prompt_invis_chars_first_line
))))
2104 _rl_last_c_pos
-= wrap_offset
- prompt_invis_chars_first_line
;
2109 else /* Delete characters from line. */
2111 /* If possible and inexpensive to use terminal deletion, then do so. */
2112 if (_rl_term_dc
&& (2 * col_temp
) >= -col_lendiff
)
2114 /* If all we're doing is erasing the invisible characters in the
2115 prompt string, don't bother. It screws up the assumptions
2116 about what's on the screen. */
2117 if (_rl_horizontal_scroll_mode
&& _rl_last_c_pos
== 0 &&
2118 displaying_prompt_first_line
&&
2119 -lendiff
== visible_wrap_offset
)
2122 /* If we have moved lmargin and we're shrinking the line, we've
2123 already moved the cursor to the first character of the new line,
2124 so deleting -col_lendiff characters will mess up the cursor
2125 position calculation */
2126 if (_rl_horizontal_scroll_mode
&& displaying_prompt_first_line
== 0 &&
2127 col_lendiff
&& _rl_last_c_pos
< -col_lendiff
)
2131 delete_chars (-col_lendiff
); /* delete (diff) characters */
2133 /* Copy (new) chars to screen from first diff to last match,
2134 overwriting what is there. */
2135 if (bytes_to_insert
> 0)
2137 /* If nfd begins at the prompt, or before the invisible
2138 characters in the prompt, we need to adjust _rl_last_c_pos
2139 in a multibyte locale to account for the wrap offset and
2140 set cpos_adjusted accordingly. */
2141 _rl_output_some_chars (nfd
, bytes_to_insert
);
2142 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
2144 _rl_last_c_pos
+= _rl_col_width (nfd
, 0, bytes_to_insert
, 1);
2145 if (current_line
== 0 && wrap_offset
&&
2146 displaying_prompt_first_line
&&
2147 _rl_last_c_pos
>= wrap_offset
&& /* XXX was > */
2148 ((nfd
- new) <= prompt_last_invisible
))
2150 _rl_last_c_pos
-= wrap_offset
; /* XXX - prompt_invis_chars_first_line? */
2155 #ifdef HANDLE_MULTIBYTE
2156 /* If we write a non-space into the last screen column,
2157 remove the note that we added a space to compensate for
2158 a multibyte double-width character that didn't fit, since
2159 it's only valid for what was previously there. */
2160 /* XXX - watch this */
2161 if (_rl_last_c_pos
== _rl_screenwidth
&&
2162 line_state_invisible
->wrapped_line
[current_line
+1] &&
2163 nfd
[bytes_to_insert
-1] != ' ')
2164 line_state_invisible
->wrapped_line
[current_line
+1] = 0;
2169 _rl_last_c_pos
+= bytes_to_insert
;
2171 /* XXX - we only want to do this if we are at the end of the line
2172 so we move there with _rl_move_cursor_relative */
2173 if (_rl_horizontal_scroll_mode
&& ((oe
-old
) > (ne
-new)))
2175 _rl_move_cursor_relative (ne
-new, new);
2176 goto clear_rest_of_line
;
2180 /* Otherwise, print over the existing material. */
2185 /* If nfd begins at the prompt, or before the invisible
2186 characters in the prompt, we need to adjust _rl_last_c_pos
2187 in a multibyte locale to account for the wrap offset and
2188 set cpos_adjusted accordingly. */
2189 _rl_output_some_chars (nfd
, temp
);
2190 _rl_last_c_pos
+= col_temp
; /* XXX */
2191 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
2193 if (current_line
== 0 && wrap_offset
&&
2194 displaying_prompt_first_line
&&
2195 _rl_last_c_pos
> wrap_offset
&&
2196 ((nfd
- new) <= prompt_last_invisible
))
2198 _rl_last_c_pos
-= wrap_offset
; /* XXX - prompt_invis_chars_first_line? */
2204 lendiff
= (oe
- old
) - (ne
- new);
2205 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
2206 col_lendiff
= _rl_col_width (old
, 0, oe
- old
, 1) - _rl_col_width (new, 0, ne
- new, 1);
2208 col_lendiff
= lendiff
;
2210 /* If we've already printed over the entire width of the screen,
2211 including the old material, then col_lendiff doesn't matter and
2212 space_to_eol will insert too many spaces. XXX - maybe we should
2213 adjust col_lendiff based on the difference between _rl_last_c_pos
2214 and _rl_screenwidth */
2215 if (col_lendiff
&& ((mb_cur_max
== 1 || rl_byte_oriented
) || (_rl_last_c_pos
< _rl_screenwidth
)))
2217 if (_rl_term_autowrap
&& current_line
< inv_botlin
)
2218 space_to_eol (col_lendiff
);
2220 _rl_clear_to_eol (col_lendiff
);
2226 /* Tell the update routines that we have moved onto a new (empty) line. */
2228 rl_on_new_line (void)
2231 visible_line
[0] = '\0';
2233 _rl_last_c_pos
= _rl_last_v_pos
= 0;
2234 _rl_vis_botlin
= last_lmargin
= 0;
2236 vis_lbreaks
[0] = vis_lbreaks
[1] = 0;
2237 visible_wrap_offset
= 0;
2241 /* Clear all screen lines occupied by the current readline line buffer
2244 rl_clear_visible_line (void)
2248 /* Make sure we move to column 0 so we clear the entire line */
2249 #if defined (__MSDOS__)
2250 putc ('\r', rl_outstream
);
2252 tputs (_rl_term_cr
, 1, _rl_output_character_function
);
2256 /* Move to the last screen line of the current visible line */
2257 _rl_move_vert (_rl_vis_botlin
);
2259 /* And erase screen lines going up to line 0 (first visible line) */
2260 for (curr_line
= _rl_last_v_pos
; curr_line
>= 0; curr_line
--)
2262 _rl_move_vert (curr_line
);
2263 _rl_clear_to_eol (0);
2269 /* Tell the update routines that we have moved onto a new line with the
2270 prompt already displayed. Code originally from the version of readline
2271 distributed with CLISP. rl_expand_prompt must have already been called
2272 (explicitly or implicitly). This still doesn't work exactly right; it
2273 should use expand_prompt() */
2275 rl_on_new_line_with_prompt (void)
2277 int prompt_size
, i
, l
, real_screenwidth
, newlines
;
2278 char *prompt_last_line
, *lprompt
;
2280 /* Initialize visible_line and invisible_line to ensure that they can hold
2281 the already-displayed prompt. */
2282 prompt_size
= strlen (rl_prompt
) + 1;
2283 init_line_structures (prompt_size
);
2285 /* Make sure the line structures hold the already-displayed prompt for
2287 lprompt
= local_prompt
? local_prompt
: rl_prompt
;
2288 strcpy (visible_line
, lprompt
);
2289 strcpy (invisible_line
, lprompt
);
2291 /* If the prompt contains newlines, take the last tail. */
2292 prompt_last_line
= strrchr (rl_prompt
, '\n');
2293 if (!prompt_last_line
)
2294 prompt_last_line
= rl_prompt
;
2296 l
= strlen (prompt_last_line
);
2297 if (MB_CUR_MAX
> 1 && rl_byte_oriented
== 0)
2298 _rl_last_c_pos
= _rl_col_width (prompt_last_line
, 0, l
, 1); /* XXX */
2302 /* Dissect prompt_last_line into screen lines. Note that here we have
2303 to use the real screenwidth. Readline's notion of screenwidth might be
2304 one less, see terminal.c. */
2305 real_screenwidth
= _rl_screenwidth
+ (_rl_term_autowrap
? 0 : 1);
2306 _rl_last_v_pos
= l
/ real_screenwidth
;
2307 /* If the prompt length is a multiple of real_screenwidth, we don't know
2308 whether the cursor is at the end of the last line, or already at the
2309 beginning of the next line. Output a newline just to be safe. */
2310 if (l
> 0 && (l
% real_screenwidth
) == 0)
2311 _rl_output_some_chars ("\n", 1);
2314 newlines
= 0; i
= 0;
2317 _rl_vis_botlin
= newlines
;
2318 vis_lbreaks
[newlines
++] = i
;
2319 i
+= real_screenwidth
;
2321 vis_lbreaks
[newlines
] = l
;
2322 visible_wrap_offset
= 0;
2324 rl_display_prompt
= rl_prompt
; /* XXX - make sure it's set */
2329 /* Actually update the display, period. */
2331 rl_forced_update_display (void)
2333 register char *temp
;
2337 temp
= visible_line
;
2343 (*rl_redisplay_function
) ();
2347 /* Redraw only the last line of a multi-line prompt. */
2349 rl_redraw_prompt_last_line (void)
2353 t
= strrchr (rl_display_prompt
, '\n');
2355 redraw_prompt (++t
);
2357 rl_forced_update_display ();
2360 /* Move the cursor from _rl_last_c_pos to NEW, which are buffer indices.
2361 (Well, when we don't have multibyte characters, _rl_last_c_pos is a
2363 DATA is the contents of the screen line of interest; i.e., where
2364 the movement is being done.
2365 DATA is always the visible line or the invisible line */
2367 _rl_move_cursor_relative (int new, const char *data
)
2370 int woff
; /* number of invisible chars on current line */
2371 int cpos
, dpos
; /* current and desired cursor positions */
2374 int mb_cur_max
= MB_CUR_MAX
;
2376 woff
= WRAP_OFFSET (_rl_last_v_pos
, wrap_offset
);
2377 cpos
= _rl_last_c_pos
;
2379 if (cpos
== 0 && cpos
== new)
2382 #if defined (HANDLE_MULTIBYTE)
2383 /* If we have multibyte characters, NEW is indexed by the buffer point in
2384 a multibyte string, but _rl_last_c_pos is the display position. In
2385 this case, NEW's display position is not obvious and must be
2386 calculated. We need to account for invisible characters in this line,
2387 as long as we are past them and they are counted by _rl_col_width. */
2388 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
2391 /* Try to short-circuit common cases and eliminate a bunch of multibyte
2392 character function calls. */
2393 /* 1. prompt string */
2394 if (new == local_prompt_len
&& memcmp (data
, local_prompt
, new) == 0)
2396 dpos
= prompt_physical_chars
;
2400 /* 2. prompt_string + line contents */
2401 else if (new > local_prompt_len
&& local_prompt
&& memcmp (data
, local_prompt
, local_prompt_len
) == 0)
2403 dpos
= prompt_physical_chars
+ _rl_col_width (data
, local_prompt_len
, new, 1);
2408 dpos
= _rl_col_width (data
, 0, new, 1);
2410 if (displaying_prompt_first_line
== 0)
2413 /* yet another special case: printing the last line of a prompt with
2414 multibyte characters and invisible characters whose printable length
2415 exceeds the screen width with the last invisible character
2416 (prompt_last_invisible) in the last line. IN_INVISLINE is the
2417 offset of DATA in invisible_line */
2419 if (data
> invisible_line
&& data
< invisible_line
+inv_lbreaks
[_rl_inv_botlin
+1])
2420 in_invisline
= data
- invisible_line
;
2422 /* Use NEW when comparing against the last invisible character in the
2423 prompt string, since they're both buffer indices and DPOS is a
2424 desired display position. */
2425 /* NEW is relative to the current displayed line, while
2426 PROMPT_LAST_INVISIBLE is relative to the entire (wrapped) line.
2427 Need a way to reconcile these two variables by turning NEW into a
2428 buffer position relative to the start of the line */
2429 if (adjust
&& ((new > prompt_last_invisible
) || /* XXX - don't use woff here */
2430 (new+in_invisline
> prompt_last_invisible
) || /* invisible line */
2431 (prompt_physical_chars
>= _rl_screenwidth
&& /* visible line */
2432 _rl_last_v_pos
== prompt_last_screen_line
&&
2433 wrap_offset
>= woff
&& dpos
>= woff
&&
2434 new > (prompt_last_invisible
-(vis_lbreaks
[_rl_last_v_pos
])-wrap_offset
))))
2435 /* XXX last comparison might need to be >= */
2438 /* Since this will be assigned to _rl_last_c_pos at the end (more
2439 precisely, _rl_last_c_pos == dpos when this function returns),
2440 let the caller know. */
2448 /* If we don't have to do anything, then return. */
2452 /* It may be faster to output a CR, and then move forwards instead
2453 of moving backwards. */
2454 /* i == current physical cursor position. */
2455 #if defined (HANDLE_MULTIBYTE)
2456 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
2460 i
= _rl_last_c_pos
- woff
;
2461 if (dpos
== 0 || CR_FASTER (dpos
, _rl_last_c_pos
) ||
2462 (_rl_term_autowrap
&& i
== _rl_screenwidth
))
2464 #if defined (__MSDOS__)
2465 putc ('\r', rl_outstream
);
2467 tputs (_rl_term_cr
, 1, _rl_output_character_function
);
2468 #endif /* !__MSDOS__ */
2469 cpos
= _rl_last_c_pos
= 0;
2474 /* Move the cursor forward. We do it by printing the command
2475 to move the cursor forward if there is one, else print that
2476 portion of the output buffer again. Which is cheaper? */
2478 /* The above comment is left here for posterity. It is faster
2479 to print one character (non-control) than to print a control
2480 sequence telling the terminal to move forward one character.
2481 That kind of control is for people who don't know what the
2482 data is underneath the cursor. */
2484 /* However, we need a handle on where the current display position is
2485 in the buffer for the immediately preceding comment to be true.
2486 In multibyte locales, we don't currently have that info available.
2487 Without it, we don't know where the data we have to display begins
2488 in the buffer and we have to go back to the beginning of the screen
2489 line. In this case, we can use the terminal sequence to move forward
2490 if it's available. */
2491 if (mb_cur_max
> 1 && rl_byte_oriented
== 0)
2493 if (_rl_term_forward_char
)
2495 for (i
= cpos
; i
< dpos
; i
++)
2496 tputs (_rl_term_forward_char
, 1, _rl_output_character_function
);
2500 tputs (_rl_term_cr
, 1, _rl_output_character_function
);
2501 for (i
= 0; i
< new; i
++)
2502 putc (data
[i
], rl_outstream
);
2506 for (i
= cpos
; i
< new; i
++)
2507 putc (data
[i
], rl_outstream
);
2510 #if defined (HANDLE_MULTIBYTE)
2511 /* NEW points to the buffer point, but _rl_last_c_pos is the display point.
2512 The byte length of the string is probably bigger than the column width
2513 of the string, which means that if NEW == _rl_last_c_pos, then NEW's
2514 display point is less than _rl_last_c_pos. */
2516 else if (cpos
> dpos
)
2517 _rl_backspace (cpos
- dpos
);
2519 _rl_last_c_pos
= dpos
;
2522 /* PWP: move the cursor up or down. */
2524 _rl_move_vert (int to
)
2526 register int delta
, i
;
2528 if (_rl_last_v_pos
== to
|| to
> _rl_screenheight
)
2531 if ((delta
= to
- _rl_last_v_pos
) > 0)
2533 for (i
= 0; i
< delta
; i
++)
2534 putc ('\n', rl_outstream
);
2535 #if defined (__MSDOS__)
2536 putc ('\r', rl_outstream
);
2538 tputs (_rl_term_cr
, 1, _rl_output_character_function
);
2547 fflush (rl_outstream
);
2548 ScreenGetCursor (&row
, &col
);
2549 ScreenSetCursor (row
+ delta
, col
);
2552 if (_rl_term_up
&& *_rl_term_up
)
2553 for (i
= 0; i
< -delta
; i
++)
2554 tputs (_rl_term_up
, 1, _rl_output_character_function
);
2555 #endif /* !__DJGPP__ */
2558 _rl_last_v_pos
= to
; /* Now TO is here */
2561 /* Physically print C on rl_outstream. This is for functions which know
2562 how to optimize the display. Return the number of characters output. */
2564 rl_show_char (int c
)
2567 if (META_CHAR (c
) && (_rl_output_meta_chars
== 0))
2569 fprintf (rl_outstream
, "M-");
2574 #if defined (DISPLAY_TABS)
2575 if ((CTRL_CHAR (c
) && c
!= '\t') || c
== RUBOUT
)
2577 if (CTRL_CHAR (c
) || c
== RUBOUT
)
2578 #endif /* !DISPLAY_TABS */
2580 fprintf (rl_outstream
, "C-");
2582 c
= CTRL_CHAR (c
) ? UNCTRL (c
) : '?';
2585 putc (c
, rl_outstream
);
2586 fflush (rl_outstream
);
2591 rl_character_len (int c
, int pos
)
2595 uc
= (unsigned char)c
;
2598 return ((_rl_output_meta_chars
== 0) ? 4 : 1);
2602 #if defined (DISPLAY_TABS)
2603 return (((pos
| 7) + 1) - pos
);
2606 #endif /* !DISPLAY_TABS */
2609 if (CTRL_CHAR (c
) || c
== RUBOUT
)
2612 return ((ISPRINT (uc
)) ? 1 : 2);
2614 /* How to print things in the "echo-area". The prompt is treated as a
2616 static int msg_saved_prompt
= 0;
2618 #if defined (USE_VARARGS)
2620 #if defined (PREFER_STDARG)
2621 rl_message (const char *format
, ...)
2623 rl_message (va_alist
)
2628 #if defined (PREFER_VARARGS)
2631 #if defined (HAVE_VSNPRINTF)
2635 #if defined (PREFER_STDARG)
2636 va_start (args
, format
);
2639 format
= va_arg (args
, char *);
2643 msg_buf
= xmalloc (msg_bufsiz
= 128);
2645 #if defined (HAVE_VSNPRINTF)
2646 bneed
= vsnprintf (msg_buf
, msg_bufsiz
, format
, args
);
2647 if (bneed
>= msg_bufsiz
- 1)
2649 msg_bufsiz
= bneed
+ 1;
2650 msg_buf
= xrealloc (msg_buf
, msg_bufsiz
);
2653 #if defined (PREFER_STDARG)
2654 va_start (args
, format
);
2657 format
= va_arg (args
, char *);
2659 vsnprintf (msg_buf
, msg_bufsiz
- 1, format
, args
);
2662 vsprintf (msg_buf
, format
, args
);
2663 msg_buf
[msg_bufsiz
- 1] = '\0'; /* overflow? */
2667 if (saved_local_prompt
== 0)
2670 msg_saved_prompt
= 1;
2672 else if (local_prompt
!= saved_local_prompt
)
2674 FREE (local_prompt
);
2675 FREE (local_prompt_prefix
);
2676 local_prompt
= (char *)NULL
;
2678 rl_display_prompt
= msg_buf
;
2679 local_prompt
= expand_prompt (msg_buf
, 0, &prompt_visible_length
,
2680 &prompt_last_invisible
,
2681 &prompt_invis_chars_first_line
,
2682 &prompt_physical_chars
);
2683 local_prompt_prefix
= (char *)NULL
;
2684 local_prompt_len
= local_prompt
? strlen (local_prompt
) : 0;
2685 (*rl_redisplay_function
) ();
2689 #else /* !USE_VARARGS */
2691 rl_message (format
, arg1
, arg2
)
2695 msg_buf
= xmalloc (msg_bufsiz
= 128);
2697 sprintf (msg_buf
, format
, arg1
, arg2
);
2698 msg_buf
[msg_bufsiz
- 1] = '\0'; /* overflow? */
2700 rl_display_prompt
= msg_buf
;
2701 if (saved_local_prompt
== 0)
2704 msg_saved_prompt
= 1;
2706 else if (local_prompt
!= saved_local_prompt
)
2708 FREE (local_prompt
);
2709 FREE (local_prompt_prefix
);
2710 local_prompt
= (char *)NULL
;
2712 local_prompt
= expand_prompt (msg_buf
, 0, &prompt_visible_length
,
2713 &prompt_last_invisible
,
2714 &prompt_invis_chars_first_line
,
2715 &prompt_physical_chars
);
2716 local_prompt_prefix
= (char *)NULL
;
2717 local_prompt_len
= local_prompt
? strlen (local_prompt
) : 0;
2718 (*rl_redisplay_function
) ();
2722 #endif /* !USE_VARARGS */
2724 /* How to clear things from the "echo-area". */
2726 rl_clear_message (void)
2728 rl_display_prompt
= rl_prompt
;
2729 if (msg_saved_prompt
)
2731 rl_restore_prompt ();
2732 msg_saved_prompt
= 0;
2734 (*rl_redisplay_function
) ();
2739 rl_reset_line_state (void)
2743 rl_display_prompt
= rl_prompt
? rl_prompt
: "";
2748 /* Save all of the variables associated with the prompt and its display. Most
2749 of the complexity is dealing with the invisible characters in the prompt
2750 string and where they are. There are enough of these that I should consider
2753 rl_save_prompt (void)
2755 saved_local_prompt
= local_prompt
;
2756 saved_local_prefix
= local_prompt_prefix
;
2757 saved_prefix_length
= prompt_prefix_length
;
2758 saved_local_length
= local_prompt_len
;
2759 saved_last_invisible
= prompt_last_invisible
;
2760 saved_visible_length
= prompt_visible_length
;
2761 saved_invis_chars_first_line
= prompt_invis_chars_first_line
;
2762 saved_physical_chars
= prompt_physical_chars
;
2763 saved_local_prompt_newlines
= local_prompt_newlines
;
2765 local_prompt
= local_prompt_prefix
= (char *)0;
2766 local_prompt_len
= 0;
2767 local_prompt_newlines
= (int *)0;
2769 prompt_last_invisible
= prompt_visible_length
= prompt_prefix_length
= 0;
2770 prompt_invis_chars_first_line
= prompt_physical_chars
= 0;
2774 rl_restore_prompt (void)
2776 FREE (local_prompt
);
2777 FREE (local_prompt_prefix
);
2778 FREE (local_prompt_newlines
);
2780 local_prompt
= saved_local_prompt
;
2781 local_prompt_prefix
= saved_local_prefix
;
2782 local_prompt_len
= saved_local_length
;
2783 local_prompt_newlines
= saved_local_prompt_newlines
;
2785 prompt_prefix_length
= saved_prefix_length
;
2786 prompt_last_invisible
= saved_last_invisible
;
2787 prompt_visible_length
= saved_visible_length
;
2788 prompt_invis_chars_first_line
= saved_invis_chars_first_line
;
2789 prompt_physical_chars
= saved_physical_chars
;
2791 /* can test saved_local_prompt to see if prompt info has been saved. */
2792 saved_local_prompt
= saved_local_prefix
= (char *)0;
2793 saved_local_length
= 0;
2794 saved_last_invisible
= saved_visible_length
= saved_prefix_length
= 0;
2795 saved_invis_chars_first_line
= saved_physical_chars
= 0;
2796 saved_local_prompt_newlines
= 0;
2800 _rl_make_prompt_for_search (int pchar
)
2807 /* We've saved the prompt, and can do anything with the various prompt
2808 strings we need before they're restored. We want the unexpanded
2809 portion of the prompt string after any final newline. */
2810 p
= rl_prompt
? strrchr (rl_prompt
, '\n') : 0;
2813 len
= (rl_prompt
&& *rl_prompt
) ? strlen (rl_prompt
) : 0;
2814 pmt
= (char *)xmalloc (len
+ 2);
2816 strcpy (pmt
, rl_prompt
);
2824 pmt
= (char *)xmalloc (len
+ 2);
2831 /* will be overwritten by expand_prompt, called from rl_message */
2832 prompt_physical_chars
= saved_physical_chars
+ 1;
2836 /* Quick redisplay hack when erasing characters at the end of the line. */
2838 _rl_erase_at_end_of_line (int l
)
2843 for (i
= 0; i
< l
; i
++)
2844 putc (' ', rl_outstream
);
2846 for (i
= 0; i
< l
; i
++)
2847 visible_line
[--_rl_last_c_pos
] = '\0';
2851 /* Clear to the end of the line. COUNT is the minimum
2852 number of character spaces to clear, but we use a terminal escape
2853 sequence if available. */
2855 _rl_clear_to_eol (int count
)
2858 if (_rl_term_clreol
)
2859 tputs (_rl_term_clreol
, 1, _rl_output_character_function
);
2863 space_to_eol (count
);
2866 /* Clear to the end of the line using spaces. COUNT is the minimum
2867 number of character spaces to clear, */
2869 space_to_eol (int count
)
2873 for (i
= 0; i
< count
; i
++)
2874 putc (' ', rl_outstream
);
2876 _rl_last_c_pos
+= count
;
2880 _rl_clear_screen (void)
2882 #if defined (__DJGPP__)
2884 ScreenSetCursor (0, 0);
2886 if (_rl_term_clrpag
)
2887 tputs (_rl_term_clrpag
, 1, _rl_output_character_function
);
2890 #endif /* __DJGPP__ */
2893 /* Insert COUNT characters from STRING to the output stream at column COL. */
2895 insert_some_chars (char *string
, int count
, int col
)
2897 open_some_spaces (col
);
2898 _rl_output_some_chars (string
, count
);
2901 /* Insert COL spaces, keeping the cursor at the same position. We follow the
2902 ncurses documentation and use either im/ei with explicit spaces, or IC/ic
2903 by itself. We assume there will either be ei or we don't need to use it. */
2905 open_some_spaces (int col
)
2907 #if !defined (__MSDOS__) && (!defined (__MINGW32__) || defined (NCURSES_VERSION))
2911 /* If IC is defined, then we do not have to "enter" insert mode. */
2914 buffer
= tgoto (_rl_term_IC
, 0, col
);
2915 tputs (buffer
, 1, _rl_output_character_function
);
2917 else if (_rl_term_im
&& *_rl_term_im
)
2919 tputs (_rl_term_im
, 1, _rl_output_character_function
);
2920 /* just output the desired number of spaces */
2921 for (i
= col
; i
--; )
2922 _rl_output_character_function (' ');
2923 /* If there is a string to turn off insert mode, use it now. */
2924 if (_rl_term_ei
&& *_rl_term_ei
)
2925 tputs (_rl_term_ei
, 1, _rl_output_character_function
);
2926 /* and move back the right number of spaces */
2927 _rl_backspace (col
);
2929 else if (_rl_term_ic
&& *_rl_term_ic
)
2931 /* If there is a special command for inserting characters, then
2932 use that first to open up the space. */
2933 for (i
= col
; i
--; )
2934 tputs (_rl_term_ic
, 1, _rl_output_character_function
);
2936 #endif /* !__MSDOS__ && (!__MINGW32__ || NCURSES_VERSION)*/
2939 /* Delete COUNT characters from the display line. */
2941 delete_chars (int count
)
2943 if (count
> _rl_screenwidth
) /* XXX */
2946 #if !defined (__MSDOS__) && (!defined (__MINGW32__) || defined (NCURSES_VERSION))
2947 if (_rl_term_DC
&& *_rl_term_DC
)
2950 buffer
= tgoto (_rl_term_DC
, count
, count
);
2951 tputs (buffer
, count
, _rl_output_character_function
);
2955 if (_rl_term_dc
&& *_rl_term_dc
)
2957 tputs (_rl_term_dc
, 1, _rl_output_character_function
);
2959 #endif /* !__MSDOS__ && (!__MINGW32__ || NCURSES_VERSION)*/
2963 _rl_update_final (void)
2965 int full_lines
, woff
, botline_length
;
2968 /* If the cursor is the only thing on an otherwise-blank last line,
2969 compensate so we don't print an extra CRLF. */
2970 if (_rl_vis_botlin
&& _rl_last_c_pos
== 0 &&
2971 visible_line
[vis_lbreaks
[_rl_vis_botlin
]] == 0)
2976 _rl_move_vert (_rl_vis_botlin
);
2977 woff
= W_OFFSET(_rl_vis_botlin
, wrap_offset
);
2978 botline_length
= VIS_LLEN(_rl_vis_botlin
) - woff
;
2979 /* If we've wrapped lines, remove the final xterm line-wrap flag. */
2980 if (full_lines
&& _rl_term_autowrap
&& botline_length
== _rl_screenwidth
)
2984 /* LAST_LINE includes invisible characters, so if you want to get the
2985 last character of the first line, you have to take WOFF into account.
2986 This needs to be done for both calls to _rl_move_cursor_relative,
2987 which takes a buffer position as the first argument, and any direct
2988 subscripts of LAST_LINE. */
2989 last_line
= &visible_line
[vis_lbreaks
[_rl_vis_botlin
]]; /* = VIS_CHARS(_rl_vis_botlin); */
2990 cpos_buffer_position
= -1; /* don't know where we are in buffer */
2991 _rl_move_cursor_relative (_rl_screenwidth
- 1 + woff
, last_line
); /* XXX */
2992 _rl_clear_to_eol (0);
2993 putc (last_line
[_rl_screenwidth
- 1 + woff
], rl_outstream
);
2996 if (botline_length
> 0 || _rl_last_c_pos
> 0)
2998 fflush (rl_outstream
);
3002 /* Move to the start of the current line. */
3008 #if defined (__MSDOS__)
3009 putc ('\r', rl_outstream
);
3011 tputs (_rl_term_cr
, 1, _rl_output_character_function
);
3017 /* Redraw the last line of a multi-line prompt that may possibly contain
3018 terminal escape sequences. Called with the cursor at column 0 of the
3019 line to draw the prompt on. */
3021 redraw_prompt (char *t
)
3025 oldp
= rl_display_prompt
;
3028 rl_display_prompt
= t
;
3029 local_prompt
= expand_prompt (t
, PMT_MULTILINE
,
3030 &prompt_visible_length
,
3031 &prompt_last_invisible
,
3032 &prompt_invis_chars_first_line
,
3033 &prompt_physical_chars
);
3034 local_prompt_prefix
= (char *)NULL
;
3035 local_prompt_len
= local_prompt
? strlen (local_prompt
) : 0;
3037 rl_forced_update_display ();
3039 rl_display_prompt
= oldp
;
3040 rl_restore_prompt();
3043 /* Redisplay the current line after a SIGWINCH is received. */
3045 _rl_redisplay_after_sigwinch (void)
3049 /* Clear the last line (assuming that the screen size change will result in
3050 either more or fewer characters on that line only) and put the cursor at
3051 column 0. Make sure the right thing happens if we have wrapped to a new
3055 _rl_move_vert (_rl_vis_botlin
);
3057 #if defined (__MSDOS__)
3058 putc ('\r', rl_outstream
);
3060 tputs (_rl_term_cr
, 1, _rl_output_character_function
);
3063 #if defined (__MSDOS__)
3064 space_to_eol (_rl_screenwidth
);
3065 putc ('\r', rl_outstream
);
3067 if (_rl_term_clreol
)
3068 tputs (_rl_term_clreol
, 1, _rl_output_character_function
);
3071 space_to_eol (_rl_screenwidth
);
3072 tputs (_rl_term_cr
, 1, _rl_output_character_function
);
3075 if (_rl_last_v_pos
> 0)
3081 /* Redraw only the last line of a multi-line prompt. */
3082 t
= strrchr (rl_display_prompt
, '\n');
3084 redraw_prompt (++t
);
3086 rl_forced_update_display ();
3090 _rl_clean_up_for_exit (void)
3094 if (_rl_vis_botlin
> 0) /* minor optimization plus bug fix */
3095 _rl_move_vert (_rl_vis_botlin
);
3097 fflush (rl_outstream
);
3098 rl_restart_output (1, 0);
3103 _rl_erase_entire_line (void)
3106 _rl_clear_to_eol (0);
3108 fflush (rl_outstream
);
3114 fflush (rl_outstream
);
3117 /* return the `current display line' of the cursor -- the number of lines to
3118 move up to get to the first screen line of the current readline line. */
3120 _rl_current_display_line (void)
3124 /* Find out whether or not there might be invisible characters in the
3126 if (rl_display_prompt
== rl_prompt
)
3127 nleft
= _rl_last_c_pos
- _rl_screenwidth
- rl_visible_prompt_length
;
3129 nleft
= _rl_last_c_pos
- _rl_screenwidth
;
3132 ret
= 1 + nleft
/ _rl_screenwidth
;
3139 #if defined (HANDLE_MULTIBYTE)
3140 /* Calculate the number of screen columns occupied by STR from START to END.
3141 In the case of multibyte characters with stateful encoding, we have to
3142 scan from the beginning of the string to take the state into account. */
3144 _rl_col_width (const char *str
, int start
, int end
, int flags
)
3148 int tmp
, point
, width
, max
;
3152 if (MB_CUR_MAX
== 1 || rl_byte_oriented
)
3153 /* this can happen in some cases where it's inconvenient to check */
3154 return (end
- start
);
3156 memset (&ps
, 0, sizeof (mbstate_t));
3161 /* Try to short-circuit common cases. The adjustment to remove wrap_offset
3162 is done by the caller. */
3163 /* 1. prompt string */
3164 if (flags
&& start
== 0 && end
== local_prompt_len
&& memcmp (str
, local_prompt
, local_prompt_len
) == 0)
3165 return (prompt_physical_chars
+ wrap_offset
);
3166 /* 2. prompt string + line contents */
3167 else if (flags
&& start
== 0 && local_prompt_len
> 0 && end
> local_prompt_len
&& local_prompt
&& memcmp (str
, local_prompt
, local_prompt_len
) == 0)
3169 tmp
= prompt_physical_chars
+ wrap_offset
;
3170 /* XXX - try to call ourselves recursively with non-prompt portion */
3171 tmp
+= _rl_col_width (str
, local_prompt_len
, end
, flags
);
3175 while (point
< start
)
3177 if (_rl_utf8locale
&& UTF8_SINGLEBYTE(str
[point
]))
3179 memset (&ps
, 0, sizeof (mbstate_t));
3183 tmp
= mbrlen (str
+ point
, max
, &ps
);
3184 if (MB_INVALIDCH ((size_t)tmp
))
3186 /* In this case, the bytes are invalid or too short to compose a
3187 multibyte character, so we assume that the first byte represents
3188 a single character. */
3192 /* Clear the state of the byte sequence, because in this case the
3193 effect of mbstate is undefined. */
3194 memset (&ps
, 0, sizeof (mbstate_t));
3196 else if (MB_NULLWCH (tmp
))
3197 break; /* Found '\0' */
3205 /* If START is not a byte that starts a character, then POINT will be
3206 greater than START. In this case, assume that (POINT - START) gives
3207 a byte count that is the number of columns of difference. */
3208 width
= point
- start
;
3212 if (_rl_utf8locale
&& UTF8_SINGLEBYTE(str
[point
]))
3215 wc
= (wchar_t) str
[point
];
3218 tmp
= mbrtowc (&wc
, str
+ point
, max
, &ps
);
3219 if (MB_INVALIDCH ((size_t)tmp
))
3221 /* In this case, the bytes are invalid or too short to compose a
3222 multibyte character, so we assume that the first byte represents
3223 a single character. */
3227 /* and assume that the byte occupies a single column. */
3230 /* Clear the state of the byte sequence, because in this case the
3231 effect of mbstate is undefined. */
3232 memset (&ps
, 0, sizeof (mbstate_t));
3234 else if (MB_NULLWCH (tmp
))
3235 break; /* Found '\0' */
3241 width
+= (tmp
>= 0) ? tmp
: 1;
3245 width
+= point
- end
;
3249 #endif /* HANDLE_MULTIBYTE */