File: bashhist.c

package info (click to toggle)
bash 2.05a-11
  • links: PTS
  • area: main
  • in suites: woody
  • size: 9,804 kB
  • ctags: 6,165
  • sloc: ansic: 67,305; sh: 10,832; perl: 4,105; yacc: 3,166; makefile: 3,075; asm: 48; awk: 23
file content (726 lines) | stat: -rw-r--r-- 17,953 bytes parent folder | download
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
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
/* bashhist.c -- bash interface to the GNU history library. */

/* Copyright (C) 1993 Free Software Foundation, Inc.

   This file is part of GNU Bash, the Bourne Again SHell.

   Bash 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.

   Bash 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.

   You should have received a copy of the GNU General Public License along
   with Bash; see the file COPYING.  If not, write to the Free Software
   Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */

#include "config.h"

#if defined (HISTORY)

#if defined (HAVE_UNISTD_H)
#  ifdef _MINIX
#    include <sys/types.h>
#  endif
#  include <unistd.h>
#endif

#include "bashtypes.h"
#include <stdio.h>
#include <errno.h>
#include "bashansi.h"
#include "posixstat.h"
#include "filecntl.h"

#include "shell.h"
#include "flags.h"
#include "input.h"
#include "parser.h"	/* for the struct dstack stuff. */
#include "pathexp.h"	/* for the struct ignorevar stuff */
#include "bashhist.h"	/* matching prototypes and declarations */
#include "builtins/common.h"

#include <readline/history.h>
#include <glob/glob.h>
#include <glob/strmatch.h>

#if defined (READLINE)
#  include "bashline.h"
#endif

#if !defined (errno)
extern int errno;
#endif

static int histignore_item_func __P((struct ign *));

static struct ignorevar histignore =
{
  "HISTIGNORE",
  (struct ign *)0,
  0,
  (char *)0,
  (sh_iv_item_func_t *)histignore_item_func,
};

#define HIGN_EXPAND 0x01

/* Declarations of bash history variables. */
/* Non-zero means to remember lines typed to the shell on the history
   list.  This is different than the user-controlled behaviour; this
   becomes zero when we read lines from a file, for example. */
int remember_on_history = 1;

/* The number of lines that Bash has added to this history session. */
int history_lines_this_session;

/* The number of lines that Bash has read from the history file. */
int history_lines_in_file;

#if defined (BANG_HISTORY)
/* Non-zero means do no history expansion on this line, regardless
   of what history_expansion says. */
int history_expansion_inhibited;
#endif

/* By default, every line is saved in the history individually.  I.e.,
   if the user enters:
	bash$ for i in a b c
	> do
	> echo $i
	> done
   Each line will be individually saved in the history.
	bash$ history
	10  for i in a b c
	11  do
	12  echo $i
	13  done
	14  history
   If the variable command_oriented_history is set, multiple lines
   which form one command will be saved as one history entry.
	bash$ for i in a b c
	> do
	> echo $i
	> done
	bash$ history
	10  for i in a b c
    do
    echo $i
    done
	11  history
   The user can then recall the whole command all at once instead
   of just being able to recall one line at a time.
   */
int command_oriented_history = 1;

/* Non-zero means to store newlines in the history list when using
   command_oriented_history rather than trying to use semicolons. */
int literal_history;

/* Non-zero means to append the history to the history file at shell
   exit, even if the history has been stifled. */
int force_append_history;

/* A nit for picking at history saving.
   Value of 0 means save all lines parsed by the shell on the history.
   Value of 1 means save all lines that do not start with a space.
   Value of 2 means save all lines that do not match the last line saved. */
int history_control;

/* Set to 1 if the last command was added to the history list successfully
   as a separate history entry; set to 0 if the line was ignored or added
   to a previous entry as part of command-oriented-history processing. */
int hist_last_line_added;

#if defined (READLINE)
/* If non-zero, and readline is being used, the user is offered the
   chance to re-edit a failed history expansion. */
int history_reediting;

/* If non-zero, and readline is being used, don't directly execute a
   line with history substitution.  Reload it into the editing buffer
   instead and let the user further edit and confirm with a newline. */
int hist_verify;

#endif /* READLINE */

/* Non-zero means to not save function definitions in the history list. */
int dont_save_function_defs;

/* Variables declared in other files used here. */
extern int current_command_line_count;

extern struct dstack dstack;

static int bash_history_inhibit_expansion __P((char *, int));
#if defined (READLINE)
static void re_edit __P((char *));
#endif
static int history_expansion_p __P((char *));
static int shell_comment __P((char *));
static int should_expand __P((char *));
static HIST_ENTRY *last_history_entry __P((void));
static char *expand_histignore_pattern __P((char *));
static int history_should_ignore __P((char *));

/* Is the history expansion starting at string[i] one that should not
   be expanded? */
static int
bash_history_inhibit_expansion (string, i)
     char *string;
     int i;
{
  /* The shell uses ! as a pattern negation character in globbing [...]
     expressions, so let those pass without expansion. */
  if (i > 0 && (string[i - 1] == '[') && member (']', string + i + 1))
    return (1);
  /* The shell uses ! as the indirect expansion character, so let those
     expansions pass as well. */
  else if (i > 1 && string[i - 1] == '{' && string[i - 2] == '$' &&
	     member ('}', string + i + 1))
    return (1);
#if defined (EXTENDED_GLOB)
  else if (extended_glob && i > 1 && string[i+1] == '(' && member (')', string + i + 2))
    return (1);
#endif
  else
    return (0);
}

void
bash_initialize_history ()
{
  history_quotes_inhibit_expansion = 1;
  history_search_delimiter_chars = ";&()|<>";
  history_inhibit_expansion_function = bash_history_inhibit_expansion;
}

void
bash_history_reinit (interact)
     int interact;
{
#if defined (BANG_HISTORY)
  history_expansion = interact != 0;
  history_expansion_inhibited = 1;
#endif
  remember_on_history = interact != 0;
  history_inhibit_expansion_function = bash_history_inhibit_expansion;
}

void
bash_history_disable ()
{
  remember_on_history = 0;
#if defined (BANG_HISTORY)
  history_expansion_inhibited = 1;
#endif
}

void
bash_history_enable ()
{
  remember_on_history = 1;
#if defined (BANG_HISTORY)
  history_expansion_inhibited = 0;
#endif
  history_inhibit_expansion_function = bash_history_inhibit_expansion;
  sv_history_control ("HISTCONTROL");
  sv_histignore ("HISTIGNORE");
}

/* Load the history list from the history file. */
void
load_history ()
{
  char *hf;
  struct stat buf;

  /* Truncate history file for interactive shells which desire it.
     Note that the history file is automatically truncated to the
     size of HISTSIZE if the user does not explicitly set the size
     differently. */
  set_if_not ("HISTFILESIZE", get_string_value ("HISTSIZE"));
  sv_histsize ("HISTFILESIZE");

  /* Read the history in HISTFILE into the history list. */
  hf = get_string_value ("HISTFILE");

  if (hf && *hf && stat (hf, &buf) == 0)
    {
      read_history (hf);
      using_history ();
      history_lines_in_file = where_history ();
    }
}

#ifdef INCLUDE_UNUSED
/* Write the existing history out to the history file. */
void
save_history ()
{
  char *hf;
  struct stat buf;

  hf = get_string_value ("HISTFILE");
  if (hf && *hf && stat (hf, &buf) == 0)
    {
      /* Append only the lines that occurred this session to
	 the history file. */
      using_history ();

      if (history_lines_this_session < where_history () || force_append_history)
	append_history (history_lines_this_session, hf);
      else
	write_history (hf);

      sv_histsize ("HISTFILESIZE");
    }
}
#endif

int
maybe_append_history (filename)
     char *filename;
{
  int fd, result;
  struct stat buf;

  result = EXECUTION_SUCCESS;
  if (history_lines_this_session && (history_lines_this_session < where_history ()))
    {
      /* If the filename was supplied, then create it if necessary. */
      if (stat (filename, &buf) == -1 && errno == ENOENT)
	{
	  fd = open (filename, O_WRONLY|O_CREAT, 0600);
	  if (fd < 0)
	    {
	      builtin_error ("%s: cannot create: %s", filename, strerror (errno));
	      return (EXECUTION_FAILURE);
	    }
	  close (fd);
	}
      result = append_history (history_lines_this_session, filename);
      history_lines_in_file += history_lines_this_session;
      history_lines_this_session = 0;
    }
  return (result);
}

/* If this is an interactive shell, then append the lines executed
   this session to the history file. */
int
maybe_save_shell_history ()
{
  int result;
  char *hf;
  struct stat buf;

  result = 0;
  if (history_lines_this_session)
    {
      hf = get_string_value ("HISTFILE");

      if (hf && *hf)
	{
	  /* If the file doesn't exist, then create it. */
	  if (stat (hf, &buf) == -1)
	    {
	      int file;
	      file = open (hf, O_CREAT | O_TRUNC | O_WRONLY, 0600);
	      if (file != -1)
		close (file);
	    }

	  /* Now actually append the lines if the history hasn't been
	     stifled.  If the history has been stifled, rewrite the
	     history file. */
	  using_history ();
	  if (history_lines_this_session <= where_history () || force_append_history)
	    {
	      result = append_history (history_lines_this_session, hf);
	      history_lines_in_file += history_lines_this_session;
	    }
	  else
	    {
	      result = write_history (hf);
	      history_lines_in_file = history_lines_this_session;
	    }
	  history_lines_this_session = 0;

	  sv_histsize ("HISTFILESIZE");
	}
    }
  return (result);
}

#if defined (READLINE)
/* Tell readline () that we have some text for it to edit. */
static void
re_edit (text)
     char *text;
{
  if (bash_input.type == st_stdin)
    bash_re_edit (text);
}
#endif /* READLINE */

/* Return 1 if this line needs history expansion. */
static int
history_expansion_p (line)
     char *line;
{
  register char *s;

  for (s = line; *s; s++)
    if (*s == history_expansion_char || *s == history_subst_char)
      return 1;
  return 0;
}

/* Do pre-processing on LINE.  If PRINT_CHANGES is non-zero, then
   print the results of expanding the line if there were any changes.
   If there is an error, return NULL, otherwise the expanded line is
   returned.  If ADDIT is non-zero the line is added to the history
   list after history expansion.  ADDIT is just a suggestion;
   REMEMBER_ON_HISTORY can veto, and does.
   Right now this does history expansion. */
char *
pre_process_line (line, print_changes, addit)
     char *line;
     int print_changes, addit;
{
  char *history_value;
  char *return_value;
  int expanded;

  return_value = line;
  expanded = 0;

#  if defined (BANG_HISTORY)
  /* History expand the line.  If this results in no errors, then
     add that line to the history if ADDIT is non-zero. */
  if (!history_expansion_inhibited && history_expansion && history_expansion_p (line))
    {
      expanded = history_expand (line, &history_value);

      if (expanded)
	{
	  if (print_changes)
	    {
	      if (expanded < 0)
		internal_error ("%s", history_value);
#if defined (READLINE)
	      else if (hist_verify == 0 || expanded == 2)
#else
	      else
#endif
		fprintf (stderr, "%s\n", history_value);
	    }

	  /* If there was an error, return NULL. */
	  if (expanded < 0 || expanded == 2)	/* 2 == print only */
	    {
	      free (history_value);

#    if defined (READLINE)
	      /* New hack.  We can allow the user to edit the
		 failed history expansion. */
	      if (history_reediting && expanded < 0)
		re_edit (line);
#    endif /* READLINE */
	      return ((char *)NULL);
	    }

#    if defined (READLINE)
	  if (hist_verify && expanded == 1)
	    {
	      re_edit (history_value);
	      return ((char *)NULL);
	    }
#    endif
	}

      /* Let other expansions know that return_value can be free'ed,
	 and that a line has been added to the history list.  Note
	 that we only add lines that have something in them. */
      expanded = 1;
      return_value = history_value;
    }
#  endif /* BANG_HISTORY */

  if (addit && remember_on_history && *return_value)
    maybe_add_history (return_value);

#if 0
  if (expanded == 0)
    return_value = savestring (line);
#endif

  return (return_value);
}

/* Return 1 if the first non-whitespace character in LINE is a `#', indicating
 * that the line is a shell comment. */
static int
shell_comment (line)
     char *line;
{
  char *p;

  for (p = line; p && *p && whitespace (*p); p++)
    ;
  return (p && *p == '#');
}

#ifdef INCLUDE_UNUSED
/* Remove shell comments from LINE.  A `#' and anything after it is a comment.
   This isn't really useful yet, since it doesn't handle quoting. */
static char *
filter_comments (line)
     char *line;
{
  char *p;

  for (p = line; p && *p && *p != '#'; p++)
    ;
  if (p && *p == '#')
    *p = '\0';
  return (line);
}
#endif

/* Add LINE to the history list depending on the value of HISTORY_CONTROL. */
void
maybe_add_history (line)
     char *line;
{
  static int first_line_saved = 0;
  HIST_ENTRY *temp;

  hist_last_line_added = 0;

  /* Don't use the value of history_control to affect the second
     and subsequent lines of a multi-line command (old code did
     this only when command_oriented_history is enabled). */
#if 0
  if (command_oriented_history && current_command_line_count > 1)
#else
  if (current_command_line_count > 1)
#endif
    {
      if (first_line_saved &&
	  (literal_history || dstack.delimiter_depth != 0 || shell_comment (line) == 0))
	bash_add_history (line);
      return;
    }

  /* This is the first line of a (possible multi-line) command.  Note whether
     or not we should save the first line and remember it. */
  first_line_saved = 0;

  switch (history_control)
    {
    case 0:
      first_line_saved = 1;
      break;
    case 1:
      if (*line != ' ')
	first_line_saved = 1;
      break;
    case 3:
      if (*line == ' ')
	break;
      /* FALLTHROUGH if case == 3 (`ignoreboth') */
    case 2:
      using_history ();
      temp = previous_history ();

      if (temp == 0 || STREQ (temp->line, line) == 0)
	first_line_saved = 1;

      using_history ();
      break;
    }

  if (first_line_saved && history_should_ignore (line) == 0)
    bash_add_history (line);
  else
    first_line_saved = 0;
}

/* Add a line to the history list.
   The variable COMMAND_ORIENTED_HISTORY controls the style of history
   remembering;  when non-zero, and LINE is not the first line of a
   complete parser construct, append LINE to the last history line instead
   of adding it as a new line. */
void
bash_add_history (line)
     char *line;
{
  int add_it, offset, curlen;
  HIST_ENTRY *current, *old;
  char *chars_to_add, *new_line;

  add_it = 1;
  if (command_oriented_history && current_command_line_count > 1)
    {
      chars_to_add = literal_history ? "\n" : history_delimiting_chars ();

      using_history ();
      current = previous_history ();

      if (current)
	{
	  /* If the previous line ended with an escaped newline (escaped
	     with backslash, but otherwise unquoted), then remove the quoted
	     newline, since that is what happens when the line is parsed. */
	  curlen = strlen (current->line);

	  if (dstack.delimiter_depth == 0 && current->line[curlen - 1] == '\\' &&
	      current->line[curlen - 2] != '\\')
	    {
	      current->line[curlen - 1] = '\0';
	      curlen--;
	      chars_to_add = "";
	    }

	  new_line = (char *)xmalloc (1
				      + curlen
				      + strlen (line)
				      + strlen (chars_to_add));
	  sprintf (new_line, "%s%s%s", current->line, chars_to_add, line);
	  offset = where_history ();
	  old = replace_history_entry (offset, new_line, current->data);
	  free (new_line);

	  if (old)
	    {
	      FREE (old->line);
	      free (old);
	    }
	  add_it = 0;
	}
    }

  if (add_it)
    {
      hist_last_line_added = 1;
      add_history (line);
      history_lines_this_session++;
    }
  using_history ();
}

int
history_number ()
{
  using_history ();
  return (get_string_value ("HISTSIZE") ? history_base + where_history () : 1);
}

static int
should_expand (s)
     char *s;
{
  char *p;

  for (p = s; p && *p; p++)
    {
      if (*p == '\\')
	p++;
      else if (*p == '&')
	return 1;
    }
  return 0;
}

static int
histignore_item_func (ign)
     struct ign *ign;
{
  if (should_expand (ign->val))
    ign->flags |= HIGN_EXPAND;
  return (0);
}

void
setup_history_ignore (varname)
     char *varname;
{
  setup_ignore_patterns (&histignore);
}

static HIST_ENTRY *
last_history_entry ()
{
  HIST_ENTRY *he;

  using_history ();
  he = previous_history ();
  using_history ();
  return he;
}

char *
last_history_line ()
{
  HIST_ENTRY *he;

  he = last_history_entry ();
  if (he == 0)
    return ((char *)NULL);
  return he->line;
}

static char *
expand_histignore_pattern (pat)
     char *pat;
{
  HIST_ENTRY *phe;
  char *ret;

  phe = last_history_entry ();

  if (phe == (HIST_ENTRY *)0)
    return (savestring (pat));

  ret = strcreplace (pat, '&', phe->line, 1);

  return ret;
}

/* Return 1 if we should not put LINE into the history according to the
   patterns in HISTIGNORE. */
static int
history_should_ignore (line)
     char *line;
{
  register int i, match;
  char *npat;

  if (histignore.num_ignores == 0)
    return 0;

  for (i = match = 0; i < histignore.num_ignores; i++)
    {
      if (histignore.ignores[i].flags & HIGN_EXPAND)
	npat = expand_histignore_pattern (histignore.ignores[i].val);
      else
	npat = histignore.ignores[i].val;

      match = strmatch (npat, line, FNMATCH_EXTFLAG) != FNM_NOMATCH;

      if (histignore.ignores[i].flags & HIGN_EXPAND)
	free (npat);

      if (match)
	break;
    }

  return match;
}
#endif /* HISTORY */