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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [readline/] [isearch.c] - Blame information for rev 822

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Line No. Rev Author Line
1 227 jeremybenn
/* **************************************************************** */
2
/*                                                                  */
3
/*                      I-Search and Searching                      */
4
/*                                                                  */
5
/* **************************************************************** */
6
 
7
/* Copyright (C) 1987-2005 Free Software Foundation, Inc.
8
 
9
   This file contains the Readline Library (the Library), a set of
10
   routines for providing Emacs style line input to programs that ask
11
   for it.
12
 
13
   The Library is free software; you can redistribute it and/or modify
14
   it under the terms of the GNU General Public License as published by
15
   the Free Software Foundation; either version 2, or (at your option)
16
   any later version.
17
 
18
   The Library is distributed in the hope that it will be useful, but
19
   WITHOUT ANY WARRANTY; without even the implied warranty of
20
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
21
   General Public License for more details.
22
 
23
   The GNU General Public License is often shipped with GNU software, and
24
   is generally kept in a file called COPYING or LICENSE.  If you do not
25
   have a copy of the license, write to the Free Software Foundation,
26
   59 Temple Place, Suite 330, Boston, MA 02111 USA. */
27
#define READLINE_LIBRARY
28
 
29
#if defined (HAVE_CONFIG_H)
30
#  include <config.h>
31
#endif
32
 
33
#include <sys/types.h>
34
 
35
#include <stdio.h>
36
 
37
#if defined (HAVE_UNISTD_H)
38
#  include <unistd.h>
39
#endif
40
 
41
#if defined (HAVE_STDLIB_H)
42
#  include <stdlib.h>
43
#else
44
#  include "ansi_stdlib.h"
45
#endif
46
 
47
#include "rldefs.h"
48
#include "rlmbutil.h"
49
 
50
#include "readline.h"
51
#include "history.h"
52
 
53
#include "rlprivate.h"
54
#include "xmalloc.h"
55
 
56
/* Variables exported to other files in the readline library. */
57
char *_rl_isearch_terminators = (char *)NULL;
58
 
59
_rl_search_cxt *_rl_iscxt = 0;
60
 
61
/* Variables imported from other files in the readline library. */
62
extern HIST_ENTRY *_rl_saved_line_for_history;
63
 
64
static int rl_search_history PARAMS((int, int));
65
 
66
static _rl_search_cxt *_rl_isearch_init PARAMS((int));
67
static void _rl_isearch_fini PARAMS((_rl_search_cxt *));
68
static int _rl_isearch_cleanup PARAMS((_rl_search_cxt *, int));
69
 
70
/* Last line found by the current incremental search, so we don't `find'
71
   identical lines many times in a row. */
72
static char *prev_line_found;
73
 
74
/* Last search string and its length. */
75
static char *last_isearch_string;
76
static int last_isearch_string_len;
77
 
78
static char *default_isearch_terminators = "\033\012";
79
 
80
_rl_search_cxt *
81
_rl_scxt_alloc (type, flags)
82
     int type, flags;
83
{
84
  _rl_search_cxt *cxt;
85
 
86
  cxt = (_rl_search_cxt *)xmalloc (sizeof (_rl_search_cxt));
87
 
88
  cxt->type = type;
89
  cxt->sflags = flags;
90
 
91
  cxt->search_string = 0;
92
  cxt->search_string_size = cxt->search_string_index = 0;
93
 
94
  cxt->lines = 0;
95
  cxt->allocated_line = 0;
96
  cxt->hlen = cxt->hindex = 0;
97
 
98
  cxt->save_point = rl_point;
99
  cxt->save_mark = rl_mark;
100
  cxt->save_line = where_history ();
101
  cxt->last_found_line = cxt->save_line;
102
  cxt->prev_line_found = 0;
103
 
104
  cxt->save_undo_list = 0;
105
 
106
  cxt->history_pos = 0;
107
  cxt->direction = 0;
108
 
109
  cxt->lastc = 0;
110
 
111
  cxt->sline = 0;
112
  cxt->sline_len = cxt->sline_index = 0;
113
 
114
  cxt->search_terminators = 0;
115
 
116
  return cxt;
117
}
118
 
119
void
120
_rl_scxt_dispose (cxt, flags)
121
     _rl_search_cxt *cxt;
122
     int flags;
123
{
124
  FREE (cxt->search_string);
125
  FREE (cxt->allocated_line);
126
  FREE (cxt->lines);
127
 
128
  free (cxt);
129
}
130
 
131
/* Search backwards through the history looking for a string which is typed
132
   interactively.  Start with the current line. */
133
int
134
rl_reverse_search_history (sign, key)
135
     int sign, key;
136
{
137
  return (rl_search_history (-sign, key));
138
}
139
 
140
/* Search forwards through the history looking for a string which is typed
141
   interactively.  Start with the current line. */
142
int
143
rl_forward_search_history (sign, key)
144
     int sign, key;
145
{
146
  return (rl_search_history (sign, key));
147
}
148
 
149
/* Display the current state of the search in the echo-area.
150
   SEARCH_STRING contains the string that is being searched for,
151
   DIRECTION is zero for forward, or non-zero for reverse,
152
   WHERE is the history list number of the current line.  If it is
153
   -1, then this line is the starting one. */
154
static void
155
rl_display_search (search_string, reverse_p, where)
156
     char *search_string;
157
     int reverse_p, where;
158
{
159
  char *message;
160
  int msglen, searchlen;
161
 
162
  searchlen = (search_string && *search_string) ? strlen (search_string) : 0;
163
 
164
  message = (char *)xmalloc (searchlen + 33);
165
  msglen = 0;
166
 
167
#if defined (NOTDEF)
168
  if (where != -1)
169
    {
170
      sprintf (message, "[%d]", where + history_base);
171
      msglen = strlen (message);
172
    }
173
#endif /* NOTDEF */
174
 
175
  message[msglen++] = '(';
176
 
177
  if (reverse_p)
178
    {
179
      strcpy (message + msglen, "reverse-");
180
      msglen += 8;
181
    }
182
 
183
  strcpy (message + msglen, "i-search)`");
184
  msglen += 10;
185
 
186
  if (search_string)
187
    {
188
      strcpy (message + msglen, search_string);
189
      msglen += searchlen;
190
    }
191
 
192
  strcpy (message + msglen, "': ");
193
 
194
  rl_message ("%s", message);
195
  free (message);
196
  (*rl_redisplay_function) ();
197
}
198
 
199
static _rl_search_cxt *
200
_rl_isearch_init (direction)
201
     int direction;
202
{
203
  _rl_search_cxt *cxt;
204
  register int i;
205
  HIST_ENTRY **hlist;
206
 
207
  cxt = _rl_scxt_alloc (RL_SEARCH_ISEARCH, 0);
208
  if (direction < 0)
209
    cxt->sflags |= SF_REVERSE;
210
 
211
  cxt->search_terminators = _rl_isearch_terminators ? _rl_isearch_terminators
212
                                                : default_isearch_terminators;
213
 
214
  /* Create an arrary of pointers to the lines that we want to search. */
215
  hlist = history_list ();
216
  rl_maybe_replace_line ();
217
  i = 0;
218
  if (hlist)
219
    for (i = 0; hlist[i]; i++);
220
 
221
  /* Allocate space for this many lines, +1 for the current input line,
222
     and remember those lines. */
223
  cxt->lines = (char **)xmalloc ((1 + (cxt->hlen = i)) * sizeof (char *));
224
  for (i = 0; i < cxt->hlen; i++)
225
    cxt->lines[i] = hlist[i]->line;
226
 
227
  if (_rl_saved_line_for_history)
228
    cxt->lines[i] = _rl_saved_line_for_history->line;
229
  else
230
    {
231
      /* Keep track of this so we can free it. */
232
      cxt->allocated_line = (char *)xmalloc (1 + strlen (rl_line_buffer));
233
      strcpy (cxt->allocated_line, &rl_line_buffer[0]);
234
      cxt->lines[i] = cxt->allocated_line;
235
    }
236
 
237
  cxt->hlen++;
238
 
239
  /* The line where we start the search. */
240
  cxt->history_pos = cxt->save_line;
241
 
242
  rl_save_prompt ();
243
 
244
  /* Initialize search parameters. */
245
  cxt->search_string = (char *)xmalloc (cxt->search_string_size = 128);
246
  cxt->search_string[cxt->search_string_index = 0] = '\0';
247
 
248
  /* Normalize DIRECTION into 1 or -1. */
249
  cxt->direction = (direction >= 0) ? 1 : -1;
250
 
251
  cxt->sline = rl_line_buffer;
252
  cxt->sline_len = strlen (cxt->sline);
253
  cxt->sline_index = rl_point;
254
 
255
  _rl_iscxt = cxt;              /* save globally */
256
 
257
  return cxt;
258
}
259
 
260
static void
261
_rl_isearch_fini (cxt)
262
     _rl_search_cxt *cxt;
263
{
264
  /* First put back the original state. */
265
  strcpy (rl_line_buffer, cxt->lines[cxt->save_line]);
266
 
267
  rl_restore_prompt ();
268
 
269
  /* Save the search string for possible later use. */
270
  FREE (last_isearch_string);
271
  last_isearch_string = cxt->search_string;
272
  last_isearch_string_len = cxt->search_string_index;
273
  cxt->search_string = 0;
274
 
275
  if (cxt->last_found_line < cxt->save_line)
276
    rl_get_previous_history (cxt->save_line - cxt->last_found_line, 0);
277
  else
278
    rl_get_next_history (cxt->last_found_line - cxt->save_line, 0);
279
 
280
  /* If the string was not found, put point at the end of the last matching
281
     line.  If last_found_line == orig_line, we didn't find any matching
282
     history lines at all, so put point back in its original position. */
283
  if (cxt->sline_index < 0)
284
    {
285
      if (cxt->last_found_line == cxt->save_line)
286
        cxt->sline_index = cxt->save_point;
287
      else
288
        cxt->sline_index = strlen (rl_line_buffer);
289
      rl_mark = cxt->save_mark;
290
    }
291
 
292
  rl_point = cxt->sline_index;
293
  /* Don't worry about where to put the mark here; rl_get_previous_history
294
     and rl_get_next_history take care of it. */
295
 
296
  rl_clear_message ();
297
}
298
 
299
int
300
_rl_search_getchar (cxt)
301
     _rl_search_cxt *cxt;
302
{
303
  int c;
304
 
305
  /* Read a key and decide how to proceed. */
306
  RL_SETSTATE(RL_STATE_MOREINPUT);
307
  c = cxt->lastc = rl_read_key ();
308
  RL_UNSETSTATE(RL_STATE_MOREINPUT);
309
 
310
#if defined (HANDLE_MULTIBYTE)
311
  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
312
    c = cxt->lastc = _rl_read_mbstring (cxt->lastc, cxt->mb, MB_LEN_MAX);
313
#endif
314
 
315
  return c;
316
}
317
 
318
/* Process just-read character C according to isearch context CXT.  Return
319
   -1 if the caller should just free the context and return, 0 if we should
320
   break out of the loop, and 1 if we should continue to read characters. */
321
int
322
_rl_isearch_dispatch (cxt, c)
323
     _rl_search_cxt *cxt;
324
     int c;
325
{
326
  int n, wstart, wlen, limit, cval;
327
  rl_command_func_t *f;
328
 
329
  f = (rl_command_func_t *)NULL;
330
 
331
 /* Translate the keys we do something with to opcodes. */
332
  if (c >= 0 && _rl_keymap[c].type == ISFUNC)
333
    {
334
      f = _rl_keymap[c].function;
335
 
336
      if (f == rl_reverse_search_history)
337
        cxt->lastc = (cxt->sflags & SF_REVERSE) ? -1 : -2;
338
      else if (f == rl_forward_search_history)
339
        cxt->lastc = (cxt->sflags & SF_REVERSE) ? -2 : -1;
340
      else if (f == rl_rubout)
341
        cxt->lastc = -3;
342
      else if (c == CTRL ('G'))
343
        cxt->lastc = -4;
344
      else if (c == CTRL ('W')) /* XXX */
345
        cxt->lastc = -5;
346
      else if (c == CTRL ('Y')) /* XXX */
347
        cxt->lastc = -6;
348
    }
349
 
350
  /* The characters in isearch_terminators (set from the user-settable
351
     variable isearch-terminators) are used to terminate the search but
352
     not subsequently execute the character as a command.  The default
353
     value is "\033\012" (ESC and C-J). */
354
  if (strchr (cxt->search_terminators, cxt->lastc))
355
    {
356
      /* ESC still terminates the search, but if there is pending
357
         input or if input arrives within 0.1 seconds (on systems
358
         with select(2)) it is used as a prefix character
359
         with rl_execute_next.  WATCH OUT FOR THIS!  This is intended
360
         to allow the arrow keys to be used like ^F and ^B are used
361
         to terminate the search and execute the movement command.
362
         XXX - since _rl_input_available depends on the application-
363
         settable keyboard timeout value, this could alternatively
364
         use _rl_input_queued(100000) */
365
      if (cxt->lastc == ESC && _rl_input_available ())
366
        rl_execute_next (ESC);
367
      return (0);
368
    }
369
 
370
#define ENDSRCH_CHAR(c) \
371
  ((CTRL_CHAR (c) || META_CHAR (c) || (c) == RUBOUT) && ((c) != CTRL ('G')))
372
 
373
#if defined (HANDLE_MULTIBYTE)
374
  if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
375
    {
376
      if (cxt->lastc >= 0 && (cxt->mb[0] && cxt->mb[1] == '\0') && ENDSRCH_CHAR (cxt->lastc))
377
        {
378
          /* This sets rl_pending_input to c; it will be picked up the next
379
             time rl_read_key is called. */
380
          rl_execute_next (cxt->lastc);
381
          return (0);
382
        }
383
    }
384
  else
385
#endif
386
    if (cxt->lastc >= 0 && ENDSRCH_CHAR (cxt->lastc))
387
      {
388
        /* This sets rl_pending_input to LASTC; it will be picked up the next
389
           time rl_read_key is called. */
390
        rl_execute_next (cxt->lastc);
391
        return (0);
392
      }
393
 
394
  /* Now dispatch on the character.  `Opcodes' affect the search string or
395
     state.  Other characters are added to the string.  */
396
  switch (cxt->lastc)
397
    {
398
    /* search again */
399
    case -1:
400
      if (cxt->search_string_index == 0)
401
        {
402
          if (last_isearch_string)
403
            {
404
              cxt->search_string_size = 64 + last_isearch_string_len;
405
              cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);
406
              strcpy (cxt->search_string, last_isearch_string);
407
              cxt->search_string_index = last_isearch_string_len;
408
              rl_display_search (cxt->search_string, (cxt->sflags & SF_REVERSE), -1);
409
              break;
410
            }
411
          return (1);
412
        }
413
      else if (cxt->sflags & SF_REVERSE)
414
        cxt->sline_index--;
415
      else if (cxt->sline_index != cxt->sline_len)
416
        cxt->sline_index++;
417
      else
418
        rl_ding ();
419
      break;
420
 
421
    /* switch directions */
422
    case -2:
423
      cxt->direction = -cxt->direction;
424
      if (cxt->direction < 0)
425
        cxt->sflags |= SF_REVERSE;
426
      else
427
        cxt->sflags &= ~SF_REVERSE;
428
      break;
429
 
430
    /* delete character from search string. */
431
    case -3:    /* C-H, DEL */
432
      /* This is tricky.  To do this right, we need to keep a
433
         stack of search positions for the current search, with
434
         sentinels marking the beginning and end.  But this will
435
         do until we have a real isearch-undo. */
436
      if (cxt->search_string_index == 0)
437
        rl_ding ();
438
      else
439
        cxt->search_string[--cxt->search_string_index] = '\0';
440
      break;
441
 
442
    case -4:    /* C-G, abort */
443
      rl_replace_line (cxt->lines[cxt->save_line], 0);
444
      rl_point = cxt->save_point;
445
      rl_mark = cxt->save_mark;
446
      rl_restore_prompt();
447
      rl_clear_message ();
448
 
449
      return -1;
450
 
451
    case -5:    /* C-W */
452
      /* skip over portion of line we already matched and yank word */
453
      wstart = rl_point + cxt->search_string_index;
454
      if (wstart >= rl_end)
455
        {
456
          rl_ding ();
457
          break;
458
        }
459
 
460
      /* if not in a word, move to one. */
461
      cval = _rl_char_value (rl_line_buffer, wstart);
462
      if (_rl_walphabetic (cval) == 0)
463
        {
464
          rl_ding ();
465
          break;
466
        }
467
      n = MB_NEXTCHAR (rl_line_buffer, wstart, 1, MB_FIND_NONZERO);;
468
      while (n < rl_end)
469
        {
470
          cval = _rl_char_value (rl_line_buffer, n);
471
          if (_rl_walphabetic (cval) == 0)
472
            break;
473
          n = MB_NEXTCHAR (rl_line_buffer, n, 1, MB_FIND_NONZERO);;
474
        }
475
      wlen = n - wstart + 1;
476
      if (cxt->search_string_index + wlen + 1 >= cxt->search_string_size)
477
        {
478
          cxt->search_string_size += wlen + 1;
479
          cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);
480
        }
481
      for (; wstart < n; wstart++)
482
        cxt->search_string[cxt->search_string_index++] = rl_line_buffer[wstart];
483
      cxt->search_string[cxt->search_string_index] = '\0';
484
      break;
485
 
486
    case -6:    /* C-Y */
487
      /* skip over portion of line we already matched and yank rest */
488
      wstart = rl_point + cxt->search_string_index;
489
      if (wstart >= rl_end)
490
        {
491
          rl_ding ();
492
          break;
493
        }
494
      n = rl_end - wstart + 1;
495
      if (cxt->search_string_index + n + 1 >= cxt->search_string_size)
496
        {
497
          cxt->search_string_size += n + 1;
498
          cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);
499
        }
500
      for (n = wstart; n < rl_end; n++)
501
        cxt->search_string[cxt->search_string_index++] = rl_line_buffer[n];
502
      cxt->search_string[cxt->search_string_index] = '\0';
503
      break;
504
 
505
    /* Add character to search string and continue search. */
506
    default:
507
      if (cxt->search_string_index + 2 >= cxt->search_string_size)
508
        {
509
          cxt->search_string_size += 128;
510
          cxt->search_string = (char *)xrealloc (cxt->search_string, cxt->search_string_size);
511
        }
512
#if defined (HANDLE_MULTIBYTE)
513
      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
514
        {
515
          int j, l;
516
          for (j = 0, l = strlen (cxt->mb); j < l; )
517
            cxt->search_string[cxt->search_string_index++] = cxt->mb[j++];
518
        }
519
      else
520
#endif
521
        cxt->search_string[cxt->search_string_index++] = c;
522
      cxt->search_string[cxt->search_string_index] = '\0';
523
      break;
524
    }
525
 
526
  for (cxt->sflags &= ~(SF_FOUND|SF_FAILED);; )
527
    {
528
      limit = cxt->sline_len - cxt->search_string_index + 1;
529
 
530
      /* Search the current line. */
531
      while ((cxt->sflags & SF_REVERSE) ? (cxt->sline_index >= 0) : (cxt->sline_index < limit))
532
        {
533
          if (STREQN (cxt->search_string, cxt->sline + cxt->sline_index, cxt->search_string_index))
534
            {
535
              cxt->sflags |= SF_FOUND;
536
              break;
537
            }
538
          else
539
            cxt->sline_index += cxt->direction;
540
        }
541
      if (cxt->sflags & SF_FOUND)
542
        break;
543
 
544
      /* Move to the next line, but skip new copies of the line
545
         we just found and lines shorter than the string we're
546
         searching for. */
547
      do
548
        {
549
          /* Move to the next line. */
550
          cxt->history_pos += cxt->direction;
551
 
552
          /* At limit for direction? */
553
          if ((cxt->sflags & SF_REVERSE) ? (cxt->history_pos < 0) : (cxt->history_pos == cxt->hlen))
554
            {
555
              cxt->sflags |= SF_FAILED;
556
              break;
557
            }
558
 
559
          /* We will need these later. */
560
          cxt->sline = cxt->lines[cxt->history_pos];
561
          cxt->sline_len = strlen (cxt->sline);
562
        }
563
      while ((cxt->prev_line_found && STREQ (cxt->prev_line_found, cxt->lines[cxt->history_pos])) ||
564
             (cxt->search_string_index > cxt->sline_len));
565
 
566
      if (cxt->sflags & SF_FAILED)
567
        break;
568
 
569
      /* Now set up the line for searching... */
570
      cxt->sline_index = (cxt->sflags & SF_REVERSE) ? cxt->sline_len - cxt->search_string_index : 0;
571
    }
572
 
573
  if (cxt->sflags & SF_FAILED)
574
    {
575
      /* We cannot find the search string.  Ding the bell. */
576
      rl_ding ();
577
      cxt->history_pos = cxt->last_found_line;
578
      return 1;
579
    }
580
 
581
  /* We have found the search string.  Just display it.  But don't
582
     actually move there in the history list until the user accepts
583
     the location. */
584
  if (cxt->sflags & SF_FOUND)
585
    {
586
      cxt->prev_line_found = cxt->lines[cxt->history_pos];
587
      rl_replace_line (cxt->lines[cxt->history_pos], 0);
588
      rl_point = cxt->sline_index;
589
      cxt->last_found_line = cxt->history_pos;
590
      rl_display_search (cxt->search_string, (cxt->sflags & SF_REVERSE), (cxt->history_pos == cxt->save_line) ? -1 : cxt->history_pos);
591
    }
592
 
593
  return 1;
594
}
595
 
596
static int
597
_rl_isearch_cleanup (cxt, r)
598
     _rl_search_cxt *cxt;
599
     int r;
600
{
601
  if (r >= 0)
602
    _rl_isearch_fini (cxt);
603
  _rl_scxt_dispose (cxt, 0);
604
  _rl_iscxt = 0;
605
 
606
  RL_UNSETSTATE(RL_STATE_ISEARCH);
607
 
608
  return (r != 0);
609
}
610
 
611
/* Search through the history looking for an interactively typed string.
612
   This is analogous to i-search.  We start the search in the current line.
613
   DIRECTION is which direction to search; >= 0 means forward, < 0 means
614
   backwards. */
615
static int
616
rl_search_history (direction, invoking_key)
617
     int direction, invoking_key;
618
{
619
  _rl_search_cxt *cxt;          /* local for now, but saved globally */
620
  int c, r;
621
 
622
  RL_SETSTATE(RL_STATE_ISEARCH);
623
  cxt = _rl_isearch_init (direction);
624
 
625
  rl_display_search (cxt->search_string, (cxt->sflags & SF_REVERSE), -1);
626
 
627
  /* If we are using the callback interface, all we do is set up here and
628
      return.  The key is that we leave RL_STATE_ISEARCH set. */
629
  if (RL_ISSTATE (RL_STATE_CALLBACK))
630
    return (0);
631
 
632
  r = -1;
633
  for (;;)
634
    {
635
      c = _rl_search_getchar (cxt);
636
      /* We might want to handle EOF here (c == 0) */
637
      r = _rl_isearch_dispatch (cxt, cxt->lastc);
638
      if (r <= 0)
639
        break;
640
    }
641
 
642
  /* The searching is over.  The user may have found the string that she
643
     was looking for, or else she may have exited a failing search.  If
644
     LINE_INDEX is -1, then that shows that the string searched for was
645
     not found.  We use this to determine where to place rl_point. */
646
  return (_rl_isearch_cleanup (cxt, r));
647
}
648
 
649
#if defined (READLINE_CALLBACKS)
650
/* Called from the callback functions when we are ready to read a key.  The
651
   callback functions know to call this because RL_ISSTATE(RL_STATE_ISEARCH).
652
   If _rl_isearch_dispatch finishes searching, this function is responsible
653
   for turning off RL_STATE_ISEARCH, which it does using _rl_isearch_cleanup. */
654
int
655
_rl_isearch_callback (cxt)
656
     _rl_search_cxt *cxt;
657
{
658
  int c, r;
659
 
660
  c = _rl_search_getchar (cxt);
661
  /* We might want to handle EOF here */
662
  r = _rl_isearch_dispatch (cxt, cxt->lastc);
663
 
664
  return (r <= 0) ? _rl_isearch_cleanup (cxt, r) : 0;
665
}
666
#endif

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