aboutsummaryrefslogtreecommitdiff
path: root/readline/readline.c
blob: aed0235bf3f1dc745bc533793e497a6c03250c06 (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
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
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
/* readline.c -- a general facility for reading lines of input
   with emacs style editing and completion. */

/* Copyright (C) 1987-2002 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

#include <sys/types.h>
#include "posixstat.h"
#include <fcntl.h>
#if defined (HAVE_SYS_FILE_H)
#  include <sys/file.h>
#endif /* HAVE_SYS_FILE_H */

#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>
#include "posixjmp.h"

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

#if defined (__EMX__)
#  define INCL_DOSPROCESS
#  include <os2.h>
#endif /* __EMX__ */

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

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

#ifndef RL_LIBRARY_VERSION
#  define RL_LIBRARY_VERSION "4.3"
#endif

#ifndef RL_READLINE_VERSION
#  define RL_READLINE_VERSION	0x0403
#endif

extern void _rl_free_history_entry PARAMS((HIST_ENTRY *));

/* Forward declarations used in this file. */
static char *readline_internal PARAMS((void));
static void readline_initialize_everything PARAMS((void));

static void bind_arrow_keys_internal PARAMS((Keymap));
static void bind_arrow_keys PARAMS((void));

static void readline_default_bindings PARAMS((void));

/* **************************************************************** */
/*								    */
/*			Line editing input utility		    */
/*								    */
/* **************************************************************** */

const char *rl_library_version = RL_LIBRARY_VERSION;

int rl_readline_version = RL_READLINE_VERSION;

/* True if this is `real' readline as opposed to some stub substitute. */
int rl_gnu_readline_p = 1;

/* A pointer to the keymap that is currently in use.
   By default, it is the standard emacs keymap. */
Keymap _rl_keymap = emacs_standard_keymap;

/* The current style of editing. */
int rl_editing_mode = emacs_mode;

/* The current insert mode:  input (the default) or overwrite */
int rl_insert_mode = RL_IM_DEFAULT;

/* Non-zero if we called this function from _rl_dispatch().  It's present
   so functions can find out whether they were called from a key binding
   or directly from an application. */
int rl_dispatching;

/* Non-zero if the previous command was a kill command. */
int _rl_last_command_was_kill = 0;

/* The current value of the numeric argument specified by the user. */
int rl_numeric_arg = 1;

/* Non-zero if an argument was typed. */
int rl_explicit_arg = 0;

/* Temporary value used while generating the argument. */
int rl_arg_sign = 1;

/* Non-zero means we have been called at least once before. */
static int rl_initialized;

#if 0
/* If non-zero, this program is running in an EMACS buffer. */
static int running_in_emacs;
#endif

/* Flags word encapsulating the current readline state. */
int rl_readline_state = RL_STATE_NONE;

/* The current offset in the current input line. */
int rl_point;

/* Mark in the current input line. */
int rl_mark;

/* Length of the current input line. */
int rl_end;

/* Make this non-zero to return the current input_line. */
int rl_done;

/* The last function executed by readline. */
rl_command_func_t *rl_last_func = (rl_command_func_t *)NULL;

/* Top level environment for readline_internal (). */
procenv_t readline_top_level;

/* The streams we interact with. */
FILE *_rl_in_stream, *_rl_out_stream;

/* The names of the streams that we do input and output to. */
FILE *rl_instream = (FILE *)NULL;
FILE *rl_outstream = (FILE *)NULL;

/* Non-zero means echo characters as they are read.  Defaults to no echo;
   set to 1 if there is a controlling terminal, we can get its attributes,
   and the attributes include `echo'.  Look at rltty.c:prepare_terminal_settings
   for the code that sets it. */
int readline_echoing_p = 0;

/* Current prompt. */
char *rl_prompt = (char *)NULL;
int rl_visible_prompt_length = 0;

/* Set to non-zero by calling application if it has already printed rl_prompt
   and does not want readline to do it the first time. */
int rl_already_prompted = 0;

/* The number of characters read in order to type this complete command. */
int rl_key_sequence_length = 0;

/* If non-zero, then this is the address of a function to call just
   before readline_internal_setup () prints the first prompt. */
rl_hook_func_t *rl_startup_hook = (rl_hook_func_t *)NULL;

/* If non-zero, this is the address of a function to call just before
   readline_internal_setup () returns and readline_internal starts
   reading input characters. */
rl_hook_func_t *rl_pre_input_hook = (rl_hook_func_t *)NULL;

/* What we use internally.  You should always refer to RL_LINE_BUFFER. */
static char *the_line;

/* The character that can generate an EOF.  Really read from
   the terminal driver... just defaulted here. */
int _rl_eof_char = CTRL ('D');

/* Non-zero makes this the next keystroke to read. */
int rl_pending_input = 0;

/* Pointer to a useful terminal name. */
const char *rl_terminal_name = (const char *)NULL;

/* Non-zero means to always use horizontal scrolling in line display. */
int _rl_horizontal_scroll_mode = 0;

/* Non-zero means to display an asterisk at the starts of history lines
   which have been modified. */
int _rl_mark_modified_lines = 0;  

/* The style of `bell' notification preferred.  This can be set to NO_BELL,
   AUDIBLE_BELL, or VISIBLE_BELL. */
int _rl_bell_preference = AUDIBLE_BELL;
     
/* String inserted into the line by rl_insert_comment (). */
char *_rl_comment_begin;

/* Keymap holding the function currently being executed. */
Keymap rl_executing_keymap;

/* Non-zero means to erase entire line, including prompt, on empty input lines. */
int rl_erase_empty_line = 0;

/* Non-zero means to read only this many characters rather than up to a
   character bound to accept-line. */
int rl_num_chars_to_read;

/* Line buffer and maintenence. */
char *rl_line_buffer = (char *)NULL;
int rl_line_buffer_len = 0;

/* Forward declarations used by the display, termcap, and history code. */

/* **************************************************************** */
/*								    */
/*			`Forward' declarations  		    */
/*								    */
/* **************************************************************** */

/* Non-zero means do not parse any lines other than comments and
   parser directives. */
unsigned char _rl_parsing_conditionalized_out = 0;

/* Non-zero means to convert characters with the meta bit set to
   escape-prefixed characters so we can indirect through
   emacs_meta_keymap or vi_escape_keymap. */
int _rl_convert_meta_chars_to_ascii = 1;

/* Non-zero means to output characters with the meta bit set directly
   rather than as a meta-prefixed escape sequence. */
int _rl_output_meta_chars = 0;

/* **************************************************************** */
/*								    */
/*			Top Level Functions			    */
/*								    */
/* **************************************************************** */

/* Non-zero means treat 0200 bit in terminal input as Meta bit. */
int _rl_meta_flag = 0;	/* Forward declaration */

/* Set up the prompt and expand it.  Called from readline() and
   rl_callback_handler_install (). */
int
rl_set_prompt (prompt)
     const char *prompt;
{
  FREE (rl_prompt);
  rl_prompt = prompt ? savestring (prompt) : (char *)NULL;

  rl_visible_prompt_length = rl_expand_prompt (rl_prompt);
  return 0;
}
  
/* Read a line of input.  Prompt with PROMPT.  An empty PROMPT means
   none.  A return value of NULL means that EOF was encountered. */
char *
readline (prompt)
     const char *prompt;
{
  char *value;

  /* If we are at EOF return a NULL string. */
  if (rl_pending_input == EOF)
    {
      rl_clear_pending_input ();
      return ((char *)NULL);
    }

  rl_set_prompt (prompt);

  rl_initialize ();
  (*rl_prep_term_function) (_rl_meta_flag);

#if defined (HANDLE_SIGNALS)
  rl_set_signals ();
#endif

  value = readline_internal ();
  (*rl_deprep_term_function) ();

#if defined (HANDLE_SIGNALS)
  rl_clear_signals ();
#endif

  return (value);
}

#if defined (READLINE_CALLBACKS)
#  define STATIC_CALLBACK
#else
#  define STATIC_CALLBACK static
#endif

STATIC_CALLBACK void
readline_internal_setup ()
{
  char *nprompt;

  _rl_in_stream = rl_instream;
  _rl_out_stream = rl_outstream;

  if (rl_startup_hook)
    (*rl_startup_hook) ();

  /* If we're not echoing, we still want to at least print a prompt, because
     rl_redisplay will not do it for us.  If the calling application has a
     custom redisplay function, though, let that function handle it. */
  if (readline_echoing_p == 0 && rl_redisplay_function == rl_redisplay)
    {
      if (rl_prompt && rl_already_prompted == 0)
	{
	  nprompt = _rl_strip_prompt (rl_prompt);
	  fprintf (_rl_out_stream, "%s", nprompt);
	  fflush (_rl_out_stream);
	  free (nprompt);
	}
    }
  else
    {
      if (rl_prompt && rl_already_prompted)
	rl_on_new_line_with_prompt ();
      else
	rl_on_new_line ();
      (*rl_redisplay_function) ();
    }

#if defined (VI_MODE)
  if (rl_editing_mode == vi_mode)
    rl_vi_insertion_mode (1, 0);
#endif /* VI_MODE */

  if (rl_pre_input_hook)
    (*rl_pre_input_hook) ();
}

STATIC_CALLBACK char *
readline_internal_teardown (eof)
     int eof;
{
  char *temp;
  HIST_ENTRY *entry;

  /* Restore the original of this history line, iff the line that we
     are editing was originally in the history, AND the line has changed. */
  entry = current_history ();

  if (entry && rl_undo_list)
    {
      temp = savestring (the_line);
      rl_revert_line (1, 0);
      entry = replace_history_entry (where_history (), the_line, (histdata_t)NULL);
      _rl_free_history_entry (entry);

      strcpy (the_line, temp);
      free (temp);
    }

  /* At any rate, it is highly likely that this line has an undo list.  Get
     rid of it now. */
  if (rl_undo_list)
    rl_free_undo_list ();

  /* Restore normal cursor, if available. */
  _rl_set_insert_mode (RL_IM_INSERT, 0);

  return (eof ? (char *)NULL : savestring (the_line));
}

STATIC_CALLBACK int
#if defined (READLINE_CALLBACKS)
readline_internal_char ()
#else
readline_internal_charloop ()
#endif
{
  static int lastc, eof_found;
  int c, code, lk;

  lastc = -1;
  eof_found = 0;

#if !defined (READLINE_CALLBACKS)
  while (rl_done == 0)
    {
#endif
      lk = _rl_last_command_was_kill;

      code = setjmp (readline_top_level);

      if (code)
	(*rl_redisplay_function) ();

      if (rl_pending_input == 0)
	{
	  /* Then initialize the argument and number of keys read. */
	  _rl_init_argument ();
	  rl_key_sequence_length = 0;
	}

      RL_SETSTATE(RL_STATE_READCMD);
      c = rl_read_key ();
      RL_UNSETSTATE(RL_STATE_READCMD);

      /* EOF typed to a non-blank line is a <NL>. */
      if (c == EOF && rl_end)
	c = NEWLINE;

      /* The character _rl_eof_char typed to blank line, and not as the
	 previous character is interpreted as EOF. */
      if (((c == _rl_eof_char && lastc != c) || c == EOF) && !rl_end)
	{
#if defined (READLINE_CALLBACKS)
	  RL_SETSTATE(RL_STATE_DONE);
	  return (rl_done = 1);
#else
	  eof_found = 1;
	  break;
#endif
	}

      lastc = c;
      _rl_dispatch ((unsigned char)c, _rl_keymap);

      /* If there was no change in _rl_last_command_was_kill, then no kill
	 has taken place.  Note that if input is pending we are reading
	 a prefix command, so nothing has changed yet. */
      if (rl_pending_input == 0 && lk == _rl_last_command_was_kill)
	_rl_last_command_was_kill = 0;

#if defined (VI_MODE)
      /* In vi mode, when you exit insert mode, the cursor moves back
	 over the previous character.  We explicitly check for that here. */
      if (rl_editing_mode == vi_mode && _rl_keymap == vi_movement_keymap)
	rl_vi_check ();
#endif /* VI_MODE */

      if (rl_num_chars_to_read && rl_end >= rl_num_chars_to_read)
        {
          (*rl_redisplay_function) ();
          rl_newline (1, '\n');
        }

      if (rl_done == 0)
	(*rl_redisplay_function) ();

      /* If the application writer has told us to erase the entire line if
	  the only character typed was something bound to rl_newline, do so. */
      if (rl_erase_empty_line && rl_done && rl_last_func == rl_newline &&
	  rl_point == 0 && rl_end == 0)
	_rl_erase_entire_line ();

#if defined (READLINE_CALLBACKS)
      return 0;
#else
    }

  return (eof_found);
#endif
}

#if defined (READLINE_CALLBACKS)
static int
readline_internal_charloop ()
{
  int eof = 1;

  while (rl_done == 0)
    eof = readline_internal_char ();
  return (eof);
}
#endif /* READLINE_CALLBACKS */

/* Read a line of input from the global rl_instream, doing output on
   the global rl_outstream.
   If rl_prompt is non-null, then that is our prompt. */
static char *
readline_internal ()
{
  int eof;

  readline_internal_setup ();
  eof = readline_internal_charloop ();
  return (readline_internal_teardown (eof));
}

void
_rl_init_line_state ()
{
  rl_point = rl_end = rl_mark = 0;
  the_line = rl_line_buffer;
  the_line[0] = 0;
}

void
_rl_set_the_line ()
{
  the_line = rl_line_buffer;
}

/* Do the command associated with KEY in MAP.
   If the associated command is really a keymap, then read
   another key, and dispatch into that map. */
int
_rl_dispatch (key, map)
     register int key;
     Keymap map;
{
  return _rl_dispatch_subseq (key, map, 0);
}

int
_rl_dispatch_subseq (key, map, got_subseq)
     register int key;
     Keymap map;
     int got_subseq;
{
  int r, newkey;
  char *macro;
  rl_command_func_t *func;

  if (META_CHAR (key) && _rl_convert_meta_chars_to_ascii)
    {
      if (map[ESC].type == ISKMAP)
	{
	  if (RL_ISSTATE (RL_STATE_MACRODEF))
	    _rl_add_macro_char (ESC);
	  map = FUNCTION_TO_KEYMAP (map, ESC);
	  key = UNMETA (key);
	  rl_key_sequence_length += 2;
	  return (_rl_dispatch (key, map));
	}
      else
	rl_ding ();
      return 0;
    }

  if (RL_ISSTATE (RL_STATE_MACRODEF))
    _rl_add_macro_char (key);

  r = 0;
  switch (map[key].type)
    {
    case ISFUNC:
      func = map[key].function;
      if (func)
	{
	  /* Special case rl_do_lowercase_version (). */
	  if (func == rl_do_lowercase_version)
	    return (_rl_dispatch (_rl_to_lower (key), map));

	  rl_executing_keymap = map;

#if 0
	  _rl_suppress_redisplay = (map[key].function == rl_insert) && _rl_input_available ();
#endif

	  rl_dispatching = 1;
	  RL_SETSTATE(RL_STATE_DISPATCHING);
	  r = (*map[key].function)(rl_numeric_arg * rl_arg_sign, key);
	  RL_UNSETSTATE(RL_STATE_DISPATCHING);
	  rl_dispatching = 0;

	  /* If we have input pending, then the last command was a prefix
	     command.  Don't change the state of rl_last_func.  Otherwise,
	     remember the last command executed in this variable. */
	  if (rl_pending_input == 0 && map[key].function != rl_digit_argument)
	    rl_last_func = map[key].function;
	}
      else if (map[ANYOTHERKEY].function)
	{
	  /* OK, there's no function bound in this map, but there is a
	     shadow function that was overridden when the current keymap
	     was created.  Return -2 to note  that. */
	  _rl_unget_char  (key);
	  return -2;
	}
      else if (got_subseq)
	{
	  /* Return -1 to note that we're in a subsequence, but  we don't
	     have a matching key, nor was one overridden.  This means
	     we need to back up the recursion chain and find the last
	     subsequence that is bound to a function. */
	  _rl_unget_char (key);
	  return -1;
	}
      else
	{
	  _rl_abort_internal ();
	  return -1;
	}
      break;

    case ISKMAP:
      if (map[key].function != 0)
	{
#if defined (VI_MODE)
	  /* The only way this test will be true is if a subsequence has been
	     bound starting with ESC, generally the arrow keys.  What we do is
	     check whether there's input in the queue, which there generally
	     will be if an arrow key has been pressed, and, if there's not,
	     just dispatch to (what we assume is) rl_vi_movement_mode right
	     away.  This is essentially an input test with a zero timeout. */
	  if (rl_editing_mode == vi_mode && key == ESC && map == vi_insertion_keymap
	      && _rl_input_queued (0) == 0)
	    return (_rl_dispatch (ANYOTHERKEY, FUNCTION_TO_KEYMAP (map, key)));
#endif

	  rl_key_sequence_length++;

	  if (key == ESC)
	    RL_SETSTATE(RL_STATE_METANEXT);
	  RL_SETSTATE(RL_STATE_MOREINPUT);
	  newkey = rl_read_key ();
	  RL_UNSETSTATE(RL_STATE_MOREINPUT);
	  if (key == ESC)
	    RL_UNSETSTATE(RL_STATE_METANEXT);

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

	  r = _rl_dispatch_subseq (newkey, FUNCTION_TO_KEYMAP (map, key), got_subseq || map[ANYOTHERKEY].function);

	  if (r == -2)
	    /* We didn't match anything, and the keymap we're indexed into
	       shadowed a function previously bound to that prefix.  Call
	       the function.  The recursive call to _rl_dispatch_subseq has
	       already taken care of pushing any necessary input back onto
	       the input queue with _rl_unget_char. */
	    r = _rl_dispatch (ANYOTHERKEY, FUNCTION_TO_KEYMAP (map, key));
	  else if (r && map[ANYOTHERKEY].function)
	    {
	      /* We didn't match (r is probably -1), so return something to
		 tell the caller that it should try ANYOTHERKEY for an
		 overridden function. */
	      _rl_unget_char (key);
	      return -2;
	    }
	  else if (r && got_subseq)
	    {
	      /* OK, back up the chain. */
	      _rl_unget_char (key);
	      return -1;
	    }
	}
      else
	{
	  _rl_abort_internal ();
	  return -1;
	}
      break;

    case ISMACR:
      if (map[key].function != 0)
	{
	  macro = savestring ((char *)map[key].function);
	  _rl_with_macro_input (macro);
	  return 0;
	}
      break;
    }
#if defined (VI_MODE)
  if (rl_editing_mode == vi_mode && _rl_keymap == vi_movement_keymap &&
      key != ANYOTHERKEY &&
      _rl_vi_textmod_command (key))
    _rl_vi_set_last (key, rl_numeric_arg, rl_arg_sign);
#endif
  return (r);
}

/* **************************************************************** */
/*								    */
/*			Initializations 			    */
/*								    */
/* **************************************************************** */

/* Initialize readline (and terminal if not already). */
int
rl_initialize ()
{
  /* If we have never been called before, initialize the
     terminal and data structures. */
  if (!rl_initialized)
    {
      RL_SETSTATE(RL_STATE_INITIALIZING);
      readline_initialize_everything ();
      RL_UNSETSTATE(RL_STATE_INITIALIZING);
      rl_initialized++;
      RL_SETSTATE(RL_STATE_INITIALIZED);
    }

  /* Initalize the current line information. */
  _rl_init_line_state ();

  /* We aren't done yet.  We haven't even gotten started yet! */
  rl_done = 0;
  RL_UNSETSTATE(RL_STATE_DONE);

  /* Tell the history routines what is going on. */
  _rl_start_using_history ();

  /* Make the display buffer match the state of the line. */
  rl_reset_line_state ();

  /* No such function typed yet. */
  rl_last_func = (rl_command_func_t *)NULL;

  /* Parsing of key-bindings begins in an enabled state. */
  _rl_parsing_conditionalized_out = 0;

#if defined (VI_MODE)
  if (rl_editing_mode == vi_mode)
    _rl_vi_initialize_line ();
#endif

  /* Each line starts in insert mode (the default). */
  _rl_set_insert_mode (RL_IM_DEFAULT, 1);

  return 0;
}

#if 0
#if defined (__EMX__)
static void
_emx_build_environ ()
{
  TIB *tibp;
  PIB *pibp;
  char *t, **tp;
  int c;

  DosGetInfoBlocks (&tibp, &pibp);
  t = pibp->pib_pchenv;
  for (c = 1; *t; c++)
    t += strlen (t) + 1;
  tp = environ = (char **)xmalloc ((c + 1) * sizeof (char *));
  t = pibp->pib_pchenv;
  while (*t)
    {
      *tp++ = t;
      t += strlen (t) + 1;
    }
  *tp = 0;
}
#endif /* __EMX__ */
#endif

/* Initialize the entire state of the world. */
static void
readline_initialize_everything ()
{
#if 0
#if defined (__EMX__)
  if (environ == 0)
    _emx_build_environ ();
#endif
#endif

#if 0
  /* Find out if we are running in Emacs -- UNUSED. */
  running_in_emacs = sh_get_env_value ("EMACS") != (char *)0;
#endif

  /* Set up input and output if they are not already set up. */
  if (!rl_instream)
    rl_instream = stdin;

  if (!rl_outstream)
    rl_outstream = stdout;

  /* Bind _rl_in_stream and _rl_out_stream immediately.  These values
     may change, but they may also be used before readline_internal ()
     is called. */
  _rl_in_stream = rl_instream;
  _rl_out_stream = rl_outstream;

  /* Allocate data structures. */
  if (rl_line_buffer == 0)
    rl_line_buffer = (char *)xmalloc (rl_line_buffer_len = DEFAULT_BUFFER_SIZE);

  /* Initialize the terminal interface. */
  if (rl_terminal_name == 0)
    rl_terminal_name = sh_get_env_value ("TERM");
  _rl_init_terminal_io (rl_terminal_name);

  /* Bind tty characters to readline functions. */
  readline_default_bindings ();

  /* Initialize the function names. */
  rl_initialize_funmap ();

  /* Decide whether we should automatically go into eight-bit mode. */
  _rl_init_eightbit ();
      
  /* Read in the init file. */
  rl_read_init_file ((char *)NULL);

  /* XXX */
  if (_rl_horizontal_scroll_mode && _rl_term_autowrap)
    {
      _rl_screenwidth--;
      _rl_screenchars -= _rl_screenheight;
    }

  /* Override the effect of any `set keymap' assignments in the
     inputrc file. */
  rl_set_keymap_from_edit_mode ();

  /* Try to bind a common arrow key prefix, if not already bound. */
  bind_arrow_keys ();

  /* Enable the meta key, if this terminal has one. */
  if (_rl_enable_meta)
    _rl_enable_meta_key ();

  /* If the completion parser's default word break characters haven't
     been set yet, then do so now. */
  if (rl_completer_word_break_characters == (char *)NULL)
    rl_completer_word_break_characters = rl_basic_word_break_characters;
}

/* If this system allows us to look at the values of the regular
   input editing characters, then bind them to their readline
   equivalents, iff the characters are not bound to keymaps. */
static void
readline_default_bindings ()
{
  rl_tty_set_default_bindings (_rl_keymap);
}

/* Bind some common arrow key sequences in MAP. */
static void
bind_arrow_keys_internal (map)
     Keymap map;
{
  Keymap xkeymap;

  xkeymap = _rl_keymap;
  _rl_keymap = map;

#if defined (__MSDOS__)
   _rl_bind_if_unbound ("\033[0A", rl_get_previous_history);
   _rl_bind_if_unbound ("\033[0B", rl_backward_char);
   _rl_bind_if_unbound ("\033[0C", rl_forward_char);
   _rl_bind_if_unbound ("\033[0D", rl_get_next_history);
#endif

  _rl_bind_if_unbound ("\033[A", rl_get_previous_history);
  _rl_bind_if_unbound ("\033[B", rl_get_next_history);
  _rl_bind_if_unbound ("\033[C", rl_forward_char);
  _rl_bind_if_unbound ("\033[D", rl_backward_char);
  _rl_bind_if_unbound ("\033[H", rl_beg_of_line);
  _rl_bind_if_unbound ("\033[F", rl_end_of_line);

  _rl_bind_if_unbound ("\033OA", rl_get_previous_history);
  _rl_bind_if_unbound ("\033OB", rl_get_next_history);
  _rl_bind_if_unbound ("\033OC", rl_forward_char);
  _rl_bind_if_unbound ("\033OD", rl_backward_char);
  _rl_bind_if_unbound ("\033OH", rl_beg_of_line);
  _rl_bind_if_unbound ("\033OF", rl_end_of_line);

  _rl_keymap = xkeymap;
}

/* Try and bind the common arrow key prefixes after giving termcap and
   the inputrc file a chance to bind them and create `real' keymaps
   for the arrow key prefix. */
static void
bind_arrow_keys ()
{
  bind_arrow_keys_internal (emacs_standard_keymap);

#if defined (VI_MODE)
  bind_arrow_keys_internal (vi_movement_keymap);
  bind_arrow_keys_internal (vi_insertion_keymap);
#endif
}

/* **************************************************************** */
/*								    */
/*		Saving and Restoring Readline's state		    */
/*								    */
/* **************************************************************** */

int
rl_save_state (sp)
     struct readline_state *sp;
{
  if (sp == 0)
    return -1;

  sp->point = rl_point;
  sp->end = rl_end;
  sp->mark = rl_mark;
  sp->buffer = rl_line_buffer;
  sp->buflen = rl_line_buffer_len;
  sp->ul = rl_undo_list;
  sp->prompt = rl_prompt;

  sp->rlstate = rl_readline_state;
  sp->done = rl_done;
  sp->kmap = _rl_keymap;

  sp->lastfunc = rl_last_func;
  sp->insmode = rl_insert_mode;
  sp->edmode = rl_editing_mode;
  sp->kseqlen = rl_key_sequence_length;
  sp->inf = rl_instream;
  sp->outf = rl_outstream;
  sp->pendingin = rl_pending_input;
  sp->macro = rl_executing_macro;

  sp->catchsigs = rl_catch_signals;
#if defined (SIGWINCH)
  sp->catchsigwinch = rl_catch_sigwinch;
#endif

  return (0);
}

int
rl_restore_state (sp)
     struct readline_state *sp;
{
  if (sp == 0)
    return -1;

  rl_point = sp->point;
  rl_end = sp->end;
  rl_mark = sp->mark;
  the_line = rl_line_buffer = sp->buffer;
  rl_line_buffer_len = sp->buflen;
  rl_undo_list = sp->ul;
  rl_prompt = sp->prompt;

  rl_readline_state = sp->rlstate;
  rl_done = sp->done;
  _rl_keymap = sp->kmap;

  rl_last_func = sp->lastfunc;
  rl_insert_mode = sp->insmode;
  rl_editing_mode = sp->edmode;
  rl_key_sequence_length = sp->kseqlen;
  rl_instream = sp->inf;
  rl_outstream = sp->outf;
  rl_pending_input = sp->pendingin;
  rl_executing_macro = sp->macro;

  rl_catch_signals = sp->catchsigs;
#if defined (SIGWINCH)
  rl_catch_sigwinch = sp->catchsigwinch;
#endif

  return (0);
}