aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libreadline/misc.c
blob: 94ecb25900a033da18d51d8b68e316cdb641453d (plain) (blame)
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
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
/* misc.c -- miscellaneous bindable readline functions. */

/* Copyright (C) 1987-2005 Free Software Foundation, Inc.

   This file is part of the GNU Readline Library, a library for
   reading lines of text with interactive input and history editing.

   The GNU Readline 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 GNU Readline 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,
   59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#define READLINE_LIBRARY

#if defined (HAVE_CONFIG_H)
#  include <config.h>
#endif

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

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

#if defined (HAVE_LOCALE_H)
#  include <locale.h>
#endif

#include <stdio.h>

/* System-specific feature definitions and include files. */
#include "rldefs.h"
#include "rlmbutil.h"

/* Some standard library routines. */
#include "readline.h"
#include "history.h"

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

static int rl_digit_loop PARAMS((void));
static void _rl_history_set_point PARAMS((void));

/* Forward declarations used in this file */
void _rl_free_history_entry PARAMS((HIST_ENTRY *));

/* If non-zero, rl_get_previous_history and rl_get_next_history attempt
   to preserve the value of rl_point from line to line. */
int _rl_history_preserve_point = 0;

_rl_arg_cxt _rl_argcxt;

/* Saved target point for when _rl_history_preserve_point is set.  Special
   value of -1 means that point is at the end of the line. */
int _rl_history_saved_point = -1;

/* **************************************************************** */
/*								    */
/*			Numeric Arguments			    */
/*								    */
/* **************************************************************** */

int
_rl_arg_overflow ()
{
  if (rl_numeric_arg > 1000000)
    {
      _rl_argcxt = 0;
      rl_explicit_arg = rl_numeric_arg = 0;
      rl_ding ();
      rl_restore_prompt ();
      rl_clear_message ();
      RL_UNSETSTATE(RL_STATE_NUMERICARG);
      return 1;
    }
  return 0;
}

void
_rl_arg_init ()
{
  rl_save_prompt ();
  _rl_argcxt = 0;
  RL_SETSTATE(RL_STATE_NUMERICARG);
}

int
_rl_arg_getchar ()
{
  int c;

  rl_message ("(arg: %d) ", rl_arg_sign * rl_numeric_arg);
  RL_SETSTATE(RL_STATE_MOREINPUT);
  c = rl_read_key ();
  RL_UNSETSTATE(RL_STATE_MOREINPUT);

  return c;
}

/* Process C as part of the current numeric argument.  Return -1 if the
   argument should be aborted, 0 if we should not read any more chars, and
   1 if we should continue to read chars. */
int
_rl_arg_dispatch (cxt, c)
     _rl_arg_cxt cxt;
     int c;
{
  int key, r;

  key = c;

  /* If we see a key bound to `universal-argument' after seeing digits,
      it ends the argument but is otherwise ignored. */
  if (_rl_keymap[c].type == ISFUNC && _rl_keymap[c].function == rl_universal_argument)
    {
      if ((cxt & NUM_SAWDIGITS) == 0)
	{
	  rl_numeric_arg *= 4;
	  return 1;
	}
      else if (RL_ISSTATE (RL_STATE_CALLBACK))
        {
          _rl_argcxt |= NUM_READONE;
          return 0;	/* XXX */
        }
      else
	{
	  RL_SETSTATE(RL_STATE_MOREINPUT);
	  key = rl_read_key ();
	  RL_UNSETSTATE(RL_STATE_MOREINPUT);
	  rl_restore_prompt ();
	  rl_clear_message ();
	  RL_UNSETSTATE(RL_STATE_NUMERICARG);
	  return (_rl_dispatch (key, _rl_keymap));
	}
    }

  c = UNMETA (c);

  if (_rl_digit_p (c))
    {
      r = _rl_digit_value (c);    	
      rl_numeric_arg = rl_explicit_arg ? (rl_numeric_arg * 10) +  r : r;
      rl_explicit_arg = 1;
      _rl_argcxt |= NUM_SAWDIGITS;
    }
  else if (c == '-' && rl_explicit_arg == 0)
    {
      rl_numeric_arg = 1;
      _rl_argcxt |= NUM_SAWMINUS;
      rl_arg_sign = -1;
    }
  else
    {
      /* Make M-- command equivalent to M--1 command. */
      if ((_rl_argcxt & NUM_SAWMINUS) && rl_numeric_arg == 1 && rl_explicit_arg == 0)
	rl_explicit_arg = 1;
      rl_restore_prompt ();
      rl_clear_message ();
      RL_UNSETSTATE(RL_STATE_NUMERICARG);

      r = _rl_dispatch (key, _rl_keymap);
      if (RL_ISSTATE (RL_STATE_CALLBACK))
	{
	  /* At worst, this will cause an extra redisplay.  Otherwise,
	     we have to wait until the next character comes in. */
	  if (rl_done == 0)
	    (*rl_redisplay_function) ();
	  r = 0;
	}
      return r;
    }

  return 1;
}

/* Handle C-u style numeric args, as well as M--, and M-digits. */
static int
rl_digit_loop ()
{
  int c, r;

  while (1)
    {
      if (_rl_arg_overflow ())
	return 1;

      c = _rl_arg_getchar ();

      if (c < 0)
	{
	  _rl_abort_internal ();
	  return -1;
	}

      r = _rl_arg_dispatch (_rl_argcxt, c);
      if (r <= 0 || (RL_ISSTATE (RL_STATE_NUMERICARG) == 0))
        break;
    }

  return r;
}

/* Create a default argument. */
void
_rl_reset_argument ()
{
  rl_numeric_arg = rl_arg_sign = 1;
  rl_explicit_arg = 0;
  _rl_argcxt = 0;
}

/* Start a numeric argument with initial value KEY */
int
rl_digit_argument (ignore, key)
     int ignore, key;
{
  _rl_arg_init ();
  if (RL_ISSTATE (RL_STATE_CALLBACK))
    {
      _rl_arg_dispatch (_rl_argcxt, key);
      rl_message ("(arg: %d) ", rl_arg_sign * rl_numeric_arg);
      return 0;
    }
  else
    {
      rl_execute_next (key);
      return (rl_digit_loop ());
    }
}

/* C-u, universal argument.  Multiply the current argument by 4.
   Read a key.  If the key has nothing to do with arguments, then
   dispatch on it.  If the key is the abort character then abort. */
int
rl_universal_argument (count, key)
     int count, key;
{
  _rl_arg_init ();
  rl_numeric_arg *= 4;

  return (RL_ISSTATE (RL_STATE_CALLBACK) ? 0 : rl_digit_loop ());
}

int
_rl_arg_callback (cxt)
     _rl_arg_cxt cxt;
{
  int c, r;

  c = _rl_arg_getchar ();

  if (_rl_argcxt & NUM_READONE)
    {
      _rl_argcxt &= ~NUM_READONE;
      rl_restore_prompt ();
      rl_clear_message ();
      RL_UNSETSTATE(RL_STATE_NUMERICARG);
      rl_execute_next (c);
      return 0;
    }

  r = _rl_arg_dispatch (cxt, c);
  return (r != 1);
}

/* What to do when you abort reading an argument. */
int
rl_discard_argument ()
{
  rl_ding ();
  rl_clear_message ();
  _rl_reset_argument ();

  return 0;
}

/* **************************************************************** */
/*								    */
/*			History Utilities			    */
/*								    */
/* **************************************************************** */

/* We already have a history library, and that is what we use to control
   the history features of readline.  This is our local interface to
   the history mechanism. */

/* While we are editing the history, this is the saved
   version of the original line. */
HIST_ENTRY *_rl_saved_line_for_history = (HIST_ENTRY *)NULL;

/* Set the history pointer back to the last entry in the history. */
void
_rl_start_using_history ()
{
  using_history ();
  if (_rl_saved_line_for_history)
    _rl_free_history_entry (_rl_saved_line_for_history);

  _rl_saved_line_for_history = (HIST_ENTRY *)NULL;
}

/* Free the contents (and containing structure) of a HIST_ENTRY. */
void
_rl_free_history_entry (entry)
     HIST_ENTRY *entry;
{
  if (entry == 0)
    return;

  FREE (entry->line);
  FREE (entry->timestamp);

  free (entry);
}

/* Perhaps put back the current line if it has changed. */
int
rl_maybe_replace_line ()
{
  HIST_ENTRY *temp;

  temp = current_history ();
  /* If the current line has changed, save the changes. */
  if (temp && ((UNDO_LIST *)(temp->data) != rl_undo_list))
    {
      temp = replace_history_entry (where_history (), rl_line_buffer, (histdata_t)rl_undo_list);
      free (temp->line);
      FREE (temp->timestamp);
      free (temp);
    }
  return 0;
}

/* Restore the _rl_saved_line_for_history if there is one. */
int
rl_maybe_unsave_line ()
{
  if (_rl_saved_line_for_history)
    {
      /* Can't call with `1' because rl_undo_list might point to an undo
	 list from a history entry, as in rl_replace_from_history() below. */
      rl_replace_line (_rl_saved_line_for_history->line, 0);
      rl_undo_list = (UNDO_LIST *)_rl_saved_line_for_history->data;
      _rl_free_history_entry (_rl_saved_line_for_history);
      _rl_saved_line_for_history = (HIST_ENTRY *)NULL;
      rl_point = rl_end;	/* rl_replace_line sets rl_end */
    }
  else
    rl_ding ();
  return 0;
}

/* Save the current line in _rl_saved_line_for_history. */
int
rl_maybe_save_line ()
{
  if (_rl_saved_line_for_history == 0)
    {
      _rl_saved_line_for_history = (HIST_ENTRY *)xmalloc (sizeof (HIST_ENTRY));
      _rl_saved_line_for_history->line = savestring (rl_line_buffer);
      _rl_saved_line_for_history->timestamp = (char *)NULL;
      _rl_saved_line_for_history->data = (char *)rl_undo_list;
    }

  return 0;
}

int
_rl_free_saved_history_line ()
{
  if (_rl_saved_line_for_history)
    {
      _rl_free_history_entry (_rl_saved_line_for_history);
      _rl_saved_line_for_history = (HIST_ENTRY *)NULL;
    }
  return 0;
}

static void
_rl_history_set_point ()
{
  rl_point = (_rl_history_preserve_point && _rl_history_saved_point != -1)
		? _rl_history_saved_point
		: rl_end;
  if (rl_point > rl_end)
    rl_point = rl_end;

#if defined (VI_MODE)
  if (rl_editing_mode == vi_mode && _rl_keymap != vi_insertion_keymap)
    rl_point = 0;
#endif /* VI_MODE */

  if (rl_editing_mode == emacs_mode)
    rl_mark = (rl_point == rl_end ? 0 : rl_end);
}

void
rl_replace_from_history (entry, flags)
     HIST_ENTRY *entry;
     int flags;			/* currently unused */
{
  /* Can't call with `1' because rl_undo_list might point to an undo list
     from a history entry, just like we're setting up here. */
  rl_replace_line (entry->line, 0);
  rl_undo_list = (UNDO_LIST *)entry->data;
  rl_point = rl_end;
  rl_mark = 0;

#if defined (VI_MODE)
  if (rl_editing_mode == vi_mode)
    {
      rl_point = 0;
      rl_mark = rl_end;
    }
#endif
}  

/* **************************************************************** */
/*								    */
/*			History Commands			    */
/*								    */
/* **************************************************************** */

/* Meta-< goes to the start of the history. */
int
rl_beginning_of_history (count, key)
     int count, key;
{
  return (rl_get_previous_history (1 + where_history (), key));
}

/* Meta-> goes to the end of the history.  (The current line). */
int
rl_end_of_history (count, key)
     int count, key;
{
  rl_maybe_replace_line ();
  using_history ();
  rl_maybe_unsave_line ();
  return 0;
}

/* Move down to the next history line. */
int
rl_get_next_history (count, key)
     int count, key;
{
  HIST_ENTRY *temp;

  if (count < 0)
    return (rl_get_previous_history (-count, key));

  if (count == 0)
    return 0;

  rl_maybe_replace_line ();

  /* either not saved by rl_newline or at end of line, so set appropriately. */
  if (_rl_history_saved_point == -1 && (rl_point || rl_end))
    _rl_history_saved_point = (rl_point == rl_end) ? -1 : rl_point;

  temp = (HIST_ENTRY *)NULL;
  while (count)
    {
      temp = next_history ();
      if (!temp)
	break;
      --count;
    }

  if (temp == 0)
    rl_maybe_unsave_line ();
  else
    {
      rl_replace_from_history (temp, 0);
      _rl_history_set_point ();
    }
  return 0;
}

/* Get the previous item out of our interactive history, making it the current
   line.  If there is no previous history, just ding. */
int
rl_get_previous_history (count, key)
     int count, key;
{
  HIST_ENTRY *old_temp, *temp;

  if (count < 0)
    return (rl_get_next_history (-count, key));

  if (count == 0)
    return 0;

  /* either not saved by rl_newline or at end of line, so set appropriately. */
  if (_rl_history_saved_point == -1 && (rl_point || rl_end))
    _rl_history_saved_point = (rl_point == rl_end) ? -1 : rl_point;

  /* If we don't have a line saved, then save this one. */
  rl_maybe_save_line ();

  /* If the current line has changed, save the changes. */
  rl_maybe_replace_line ();

  temp = old_temp = (HIST_ENTRY *)NULL;
  while (count)
    {
      temp = previous_history ();
      if (temp == 0)
	break;

      old_temp = temp;
      --count;
    }

  /* If there was a large argument, and we moved back to the start of the
     history, that is not an error.  So use the last value found. */
  if (!temp && old_temp)
    temp = old_temp;

  if (temp == 0)
    rl_ding ();
  else
    {
      rl_replace_from_history (temp, 0);
      _rl_history_set_point ();
    }

  return 0;
}

/* **************************************************************** */
/*								    */
/*			    Editing Modes			    */
/*								    */
/* **************************************************************** */
/* How to toggle back and forth between editing modes. */
int
rl_vi_editing_mode (count, key)
     int count, key;
{
#if defined (VI_MODE)
  _rl_set_insert_mode (RL_IM_INSERT, 1);	/* vi mode ignores insert mode */
  rl_editing_mode = vi_mode;
  rl_vi_insertion_mode (1, key);
#endif /* VI_MODE */

  return 0;
}

int
rl_emacs_editing_mode (count, key)
     int count, key;
{
  rl_editing_mode = emacs_mode;
  _rl_set_insert_mode (RL_IM_INSERT, 1); /* emacs mode default is insert mode */
  _rl_keymap = emacs_standard_keymap;
  return 0;
}

/* Function for the rest of the library to use to set insert/overwrite mode. */
void
_rl_set_insert_mode (im, force)
     int im, force;
{
#ifdef CURSOR_MODE
  _rl_set_cursor (im, force);
#endif

  rl_insert_mode = im;
}

/* Toggle overwrite mode.  A positive explicit argument selects overwrite
   mode.  A negative or zero explicit argument selects insert mode. */
int
rl_overwrite_mode (count, key)
     int count, key;
{
  if (rl_explicit_arg == 0)
    _rl_set_insert_mode (rl_insert_mode ^ 1, 0);
  else if (count > 0)
    _rl_set_insert_mode (RL_IM_OVERWRITE, 0);
  else
    _rl_set_insert_mode (RL_IM_INSERT, 0);

  return 0;
}