summaryrefslogtreecommitdiff
path: root/cmd-line-utils/readline/search.c
blob: cf50a7cc49939325962b98cb8771f629932fb466 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
/* search.c - code for non-incremental searching in emacs and vi modes. */

/* Copyright (C) 1992-2005 Free Software Foundation, Inc.

   This file is part of the Readline Library (the Library), a set of
   routines for providing Emacs style line input to programs that ask
   for it.

   The Library is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   The Library is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   The GNU General Public License is often shipped with GNU software, and
   is generally kept in a file called COPYING or LICENSE.  If you do not
   have a copy of the license, write to the Free Software Foundation,
   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA. */
#define READLINE_LIBRARY

#if defined (HAVE_CONFIG_H)
#  include "config_readline.h"
#endif

#include <sys/types.h>
#include <stdio.h>

#if defined (HAVE_UNISTD_H)
#  include <unistd.h>
#endif

#if defined (HAVE_STDLIB_H)
#  include <stdlib.h>
#else
#  include "ansi_stdlib.h"
#endif

#include "rldefs.h"
#include "rlmbutil.h"

#include "readline.h"
#include "history.h"

#include "rlprivate.h"
#include "xmalloc.h"

#ifdef abs
#  undef abs
#endif
#define abs(x)		(((x) >= 0) ? (x) : -(x))

_rl_search_cxt *_rl_nscxt = 0;

extern HIST_ENTRY *_rl_saved_line_for_history;

/* Functions imported from the rest of the library. */
extern int _rl_free_history_entry PARAMS((HIST_ENTRY *));

static char *noninc_search_string = (char *) NULL;
static int noninc_history_pos;

static char *prev_line_found = (char *) NULL;

static int rl_history_search_len;
static int rl_history_search_pos;
static char *history_search_string;
static int history_string_size;

static void make_history_line_current PARAMS((HIST_ENTRY *));
static int noninc_search_from_pos PARAMS((char *, int, int));
static int noninc_dosearch PARAMS((char *, int));
static int noninc_search PARAMS((int, int));
static int rl_history_search_internal PARAMS((int, int));
static void rl_history_search_reinit PARAMS((void));

static _rl_search_cxt *_rl_nsearch_init PARAMS((int, int));
static int _rl_nsearch_cleanup PARAMS((_rl_search_cxt *, int));
static void _rl_nsearch_abort PARAMS((_rl_search_cxt *));
static int _rl_nsearch_dispatch PARAMS((_rl_search_cxt *, int));

/* Make the data from the history entry ENTRY be the contents of the
   current line.  This doesn't do anything with rl_point; the caller
   must set it. */
static void
make_history_line_current (entry)
     HIST_ENTRY *entry;
{
  _rl_replace_text (entry->line, 0, rl_end);
  _rl_fix_point (1);
#if defined (VI_MODE)
  if (rl_editing_mode == vi_mode)
    /* POSIX.2 says that the `U' command doesn't affect the copy of any
       command lines to the edit line.  We're going to implement that by
       making the undo list start after the matching line is copied to the
       current editing buffer. */
    rl_free_undo_list ();
#endif

  if (_rl_saved_line_for_history)
    _rl_free_history_entry (_rl_saved_line_for_history);
  _rl_saved_line_for_history = (HIST_ENTRY *)NULL;
}

/* Search the history list for STRING starting at absolute history position
   POS.  If STRING begins with `^', the search must match STRING at the
   beginning of a history line, otherwise a full substring match is performed
   for STRING.  DIR < 0 means to search backwards through the history list,
   DIR >= 0 means to search forward. */
static int
noninc_search_from_pos (string, pos, dir)
     char *string;
     int pos, dir;
{
  int ret, old;

  if (pos < 0)
    return -1;

  old = where_history ();
  if (history_set_pos (pos) == 0)
    return -1;

  RL_SETSTATE(RL_STATE_SEARCH);
  if (*string == '^')
    ret = history_search_prefix (string + 1, dir);
  else
    ret = history_search (string, dir);
  RL_UNSETSTATE(RL_STATE_SEARCH);

  if (ret != -1)
    ret = where_history ();

  history_set_pos (old);
  return (ret);
}

/* Search for a line in the history containing STRING.  If DIR is < 0, the
   search is backwards through previous entries, else through subsequent
   entries.  Returns 1 if the search was successful, 0 otherwise. */
static int
noninc_dosearch (string, dir)
     char *string;
     int dir;
{
  int oldpos, pos;
  HIST_ENTRY *entry;

  if (string == 0 || *string == '\0' || noninc_history_pos < 0)
    {
      rl_ding ();
      return 0;
    }

  pos = noninc_search_from_pos (string, noninc_history_pos + dir, dir);
  if (pos == -1)
    {
      /* Search failed, current history position unchanged. */
      rl_maybe_unsave_line ();
      rl_clear_message ();
      rl_point = 0;
      rl_ding ();
      return 0;
    }

  noninc_history_pos = pos;

  oldpos = where_history ();
  history_set_pos (noninc_history_pos);
  entry = current_history ();
#if defined (VI_MODE)
  if (rl_editing_mode != vi_mode)
#endif
    history_set_pos (oldpos);

  make_history_line_current (entry);

  rl_point = 0;
  rl_mark = rl_end;

  rl_clear_message ();
  return 1;
}

static _rl_search_cxt *
_rl_nsearch_init (dir, pchar)
     int dir, pchar;
{
  _rl_search_cxt *cxt;
  char *p;

  cxt = _rl_scxt_alloc (RL_SEARCH_NSEARCH, 0);
  if (dir < 0)
    cxt->sflags |= SF_REVERSE;		/* not strictly needed */

  cxt->direction = dir;
  cxt->history_pos = cxt->save_line;

  rl_maybe_save_line ();

  /* Clear the undo list, since reading the search string should create its
     own undo list, and the whole list will end up being freed when we
     finish reading the search string. */
  rl_undo_list = 0;

  /* Use the line buffer to read the search string. */
  rl_line_buffer[0] = 0;
  rl_end = rl_point = 0;

  p = _rl_make_prompt_for_search (pchar ? pchar : ':');
  rl_message ("%s", p);
  free (p);

  RL_SETSTATE(RL_STATE_NSEARCH);

  _rl_nscxt = cxt;

  return cxt;
}

static int
_rl_nsearch_cleanup (cxt, r)
     _rl_search_cxt *cxt;
     int r;
{
  _rl_scxt_dispose (cxt, 0);
  _rl_nscxt = 0;

  RL_UNSETSTATE(RL_STATE_NSEARCH);

  return (r != 1);
}

static void
_rl_nsearch_abort (cxt)
     _rl_search_cxt *cxt;
{
  rl_maybe_unsave_line ();
  rl_clear_message ();
  rl_point = cxt->save_point;
  rl_mark = cxt->save_mark;
  rl_restore_prompt ();

  RL_UNSETSTATE (RL_STATE_NSEARCH);
}

/* Process just-read character C according to search context CXT.  Return -1
   if the caller should abort the search, 0 if we should break out of the
   loop, and 1 if we should continue to read characters. */
static int
_rl_nsearch_dispatch (cxt, c)
     _rl_search_cxt *cxt;
     int c;
{
  switch (c)
    {
    case CTRL('W'):
      rl_unix_word_rubout (1, c);
      break;

    case CTRL('U'):
      rl_unix_line_discard (1, c);
      break;

    case RETURN:
    case NEWLINE:
      return 0;

    case CTRL('H'):
    case RUBOUT:
      if (rl_point == 0)
	{
	  _rl_nsearch_abort (cxt);
	  return -1;
	}
      _rl_rubout_char (1, c);
      break;

    case CTRL('C'):
    case CTRL('G'):
      rl_ding ();
      _rl_nsearch_abort (cxt);
      return -1;

    default:
#if defined (HANDLE_MULTIBYTE)
      if (MB_CUR_MAX > 1 && rl_byte_oriented == 0)
	rl_insert_text (cxt->mb);
      else
#endif
	_rl_insert_char (1, c);
      break;
    }

  (*rl_redisplay_function) ();
  return 1;
}

/* Perform one search according to CXT, using NONINC_SEARCH_STRING.  Return
   -1 if the search should be aborted, any other value means to clean up
   using _rl_nsearch_cleanup ().  Returns 1 if the search was successful,
   0 otherwise. */
static int
_rl_nsearch_dosearch (cxt)
     _rl_search_cxt *cxt;
{
  rl_mark = cxt->save_mark;

  /* If rl_point == 0, we want to re-use the previous search string and
     start from the saved history position.  If there's no previous search
     string, punt. */
  if (rl_point == 0)
    {
      if (noninc_search_string == 0)
	{
	  rl_ding ();
	  rl_restore_prompt ();
	  RL_UNSETSTATE (RL_STATE_NSEARCH);
	  return -1;
	}
    }
  else
    {
      /* We want to start the search from the current history position. */
      noninc_history_pos = cxt->save_line;
      FREE (noninc_search_string);
      noninc_search_string = savestring (rl_line_buffer);

      /* If we don't want the subsequent undo list generated by the search
	 matching a history line to include the contents of the search string,
	 we need to clear rl_line_buffer here.  For now, we just clear the
	 undo list generated by reading the search string.  (If the search
	 fails, the old undo list will be restored by rl_maybe_unsave_line.) */
      rl_free_undo_list ();
    }

  rl_restore_prompt ();
  return (noninc_dosearch (noninc_search_string, cxt->direction));
}

/* Search non-interactively through the history list.  DIR < 0 means to
   search backwards through the history of previous commands; otherwise
   the search is for commands subsequent to the current position in the
   history list.  PCHAR is the character to use for prompting when reading
   the search string; if not specified (0), it defaults to `:'. */
static int
noninc_search (dir, pchar)
     int dir;
     int pchar;
{
  _rl_search_cxt *cxt;
  int c, r;

  cxt = _rl_nsearch_init (dir, pchar);

  if (RL_ISSTATE (RL_STATE_CALLBACK))
    return (0);

  /* Read the search string. */
  r = 0;
  while (1)
    {
      c = _rl_search_getchar (cxt);

      if (c == 0)
	break;

      r = _rl_nsearch_dispatch (cxt, c);
      if (r < 0)
        return 1;
      else if (r == 0)
	break;        
    }

  r = _rl_nsearch_dosearch (cxt);
  return ((r >= 0) ? _rl_nsearch_cleanup (cxt, r) : (r != 1));
}

/* Search forward through the history list for a string.  If the vi-mode
   code calls this, KEY will be `?'. */
int
rl_noninc_forward_search (count, key)
     int count __attribute__((unused)), key;
{
  return noninc_search (1, (key == '?') ? '?' : 0);
}

/* Reverse search the history list for a string.  If the vi-mode code
   calls this, KEY will be `/'. */
int
rl_noninc_reverse_search (count, key)
     int count __attribute__((unused)), key;
{
  return noninc_search (-1, (key == '/') ? '/' : 0);
}

/* Search forward through the history list for the last string searched
   for.  If there is no saved search string, abort. */
int
rl_noninc_forward_search_again (count, key)
     int count __attribute__((unused)), key __attribute__((unused));
{
  int r;

  if (!noninc_search_string)
    {
      rl_ding ();
      return (-1);
    }
  r = noninc_dosearch (noninc_search_string, 1);
  return (r != 1);
}

/* Reverse search in the history list for the last string searched
   for.  If there is no saved search string, abort. */
int
rl_noninc_reverse_search_again (count, key)
     int count __attribute__((unused)), key __attribute__((unused));
{
  int r;

  if (!noninc_search_string)
    {
      rl_ding ();
      return (-1);
    }
  r = noninc_dosearch (noninc_search_string, -1);
  return (r != 1);
}

#if defined (READLINE_CALLBACKS)
int
_rl_nsearch_callback (cxt)
     _rl_search_cxt *cxt;
{
  int c, r;

  c = _rl_search_getchar (cxt);
  r = _rl_nsearch_dispatch (cxt, c);
  if (r != 0)
    return 1;

  r = _rl_nsearch_dosearch (cxt);
  return ((r >= 0) ? _rl_nsearch_cleanup (cxt, r) : (r != 1));
}
#endif
  
static int
rl_history_search_internal (count, dir)
     int count, dir;
{
  HIST_ENTRY *temp;
  int ret, oldpos;

  rl_maybe_save_line ();
  temp = (HIST_ENTRY *)NULL;

  /* Search COUNT times through the history for a line whose prefix
     matches history_search_string.  When this loop finishes, TEMP,
     if non-null, is the history line to copy into the line buffer. */
  while (count)
    {
      ret = noninc_search_from_pos (history_search_string, rl_history_search_pos + dir, dir);
      if (ret == -1)
	break;

      /* Get the history entry we found. */
      rl_history_search_pos = ret;
      oldpos = where_history ();
      history_set_pos (rl_history_search_pos);
      temp = current_history ();
      history_set_pos (oldpos);

      /* Don't find multiple instances of the same line. */
      if (prev_line_found && STREQ (prev_line_found, temp->line))
        continue;
      prev_line_found = temp->line;
      count--;
    }

  /* If we didn't find anything at all, return. */
  if (temp == 0)
    {
      rl_maybe_unsave_line ();
      rl_ding ();
      /* If you don't want the saved history line (last match) to show up
         in the line buffer after the search fails, change the #if 0 to
         #if 1 */
#if 0
      if (rl_point > rl_history_search_len)
        {
          rl_point = rl_end = rl_history_search_len;
          rl_line_buffer[rl_end] = '\0';
          rl_mark = 0;
        }
#else
      rl_point = rl_history_search_len;	/* rl_maybe_unsave_line changes it */
      rl_mark = rl_end;
#endif
      return 1;
    }

  /* Copy the line we found into the current line buffer. */
  make_history_line_current (temp);

  rl_point = rl_history_search_len;
  rl_mark = rl_end;

  return 0;
}

static void
rl_history_search_reinit ()
{
  rl_history_search_pos = where_history ();
  rl_history_search_len = rl_point;
  prev_line_found = (char *)NULL;
  if (rl_point)
    {
      if (rl_history_search_len >= history_string_size - 2)
	{
	  history_string_size = rl_history_search_len + 2;
	  history_search_string = (char *)xrealloc (history_search_string, history_string_size);
	}
      history_search_string[0] = '^';
      strncpy (history_search_string + 1, rl_line_buffer, rl_point);
      history_search_string[rl_point + 1] = '\0';
    }
  _rl_free_saved_history_line ();
}

/* Search forward in the history for the string of characters
   from the start of the line to rl_point.  This is a non-incremental
   search. */
int
rl_history_search_forward (count, ignore)
     int count, ignore;
{
  if (count == 0)
    return (0);

  if (rl_last_func != rl_history_search_forward &&
      rl_last_func != rl_history_search_backward)
    rl_history_search_reinit ();

  if (rl_history_search_len == 0)
    return (rl_get_next_history (count, ignore));
  return (rl_history_search_internal (abs (count), (count > 0) ? 1 : -1));
}

/* Search backward through the history for the string of characters
   from the start of the line to rl_point.  This is a non-incremental
   search. */
int
rl_history_search_backward (count, ignore)
     int count, ignore;
{
  if (count == 0)
    return (0);

  if (rl_last_func != rl_history_search_forward &&
      rl_last_func != rl_history_search_backward)
    rl_history_search_reinit ();

  if (rl_history_search_len == 0)
    return (rl_get_previous_history (count, ignore));
  return (rl_history_search_internal (abs (count), (count > 0) ? -1 : 1));
}