aboutsummaryrefslogtreecommitdiff
path: root/readline/input.c
blob: 95ace842ba20e00f1bce6783b977898921915166 (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
/* input.c -- character input functions for readline. */

/* Copyright (C) 1994-2017 Free Software Foundation, Inc.

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

   Readline 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 3 of the License, or
   (at your option) any later version.

   Readline 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 Readline.  If not, see <http://www.gnu.org/licenses/>.
*/

#define READLINE_LIBRARY

#if defined (__TANDEM)
#  include <floss.h>
#endif

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

#include <sys/types.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 */

#include <signal.h>

#include "posixselect.h"

#if defined (FIONREAD_IN_SYS_IOCTL)
#  include <sys/ioctl.h>
#endif

#include <stdio.h>
#include <errno.h>

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

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

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

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

/* What kind of non-blocking I/O do we have? */
#if !defined (O_NDELAY) && defined (O_NONBLOCK)
#  define O_NDELAY O_NONBLOCK	/* Posix style */
#endif

#if defined (HAVE_PSELECT)
extern sigset_t _rl_orig_sigset;
#endif

/* Non-null means it is a pointer to a function to run while waiting for
   character input. */
rl_hook_func_t *rl_event_hook = (rl_hook_func_t *)NULL;

/* A function to call if a read(2) is interrupted by a signal. */
rl_hook_func_t *rl_signal_event_hook = (rl_hook_func_t *)NULL;

/* A function to replace _rl_input_available for applications using the
   callback interface. */
rl_hook_func_t *rl_input_available_hook = (rl_hook_func_t *)NULL;

rl_getc_func_t *rl_getc_function = rl_getc;

static int _keyboard_input_timeout = 100000;		/* 0.1 seconds; it's in usec */

static int ibuffer_space PARAMS((void));
static int rl_get_char PARAMS((int *));
static int rl_gather_tyi PARAMS((void));

#if defined (_WIN32) && !defined (__CYGWIN__)

/* 'isatty' in the Windows runtime returns non-zero for every
   character device, including the null device.  Repair that.  */
#include <io.h>
#include <conio.h>
#define WIN32_LEAN_AND_MEAN 1
#include <windows.h>

int w32_isatty (int fd)
{
  if (_isatty(fd))
    {
      HANDLE h;
      DWORD ignored;

      if ((h = (HANDLE) _get_osfhandle (fd)) == INVALID_HANDLE_VALUE)
	{
	  errno = EBADF;
	  return 0;
	}
      if (GetConsoleMode (h, &ignored) != 0)
	return 1;
    }
  errno = ENOTTY;
  return 0;
}

#define isatty(x)  w32_isatty(x)
#endif

/* **************************************************************** */
/*								    */
/*			Character Input Buffering       	    */
/*								    */
/* **************************************************************** */

static int pop_index, push_index;
static unsigned char ibuffer[512];
static int ibuffer_len = sizeof (ibuffer) - 1;

#define any_typein (push_index != pop_index)

int
_rl_any_typein (void)
{
  return any_typein;
}

int
_rl_pushed_input_available (void)
{
  return (push_index != pop_index);
}

/* Return the amount of space available in the buffer for stuffing
   characters. */
static int
ibuffer_space (void)
{
  if (pop_index > push_index)
    return (pop_index - push_index - 1);
  else
    return (ibuffer_len - (push_index - pop_index));
}

/* Get a key from the buffer of characters to be read.
   Return the key in KEY.
   Result is non-zero if there was a key, or 0 if there wasn't. */
static int
rl_get_char (int *key)
{
  if (push_index == pop_index)
    return (0);

  *key = ibuffer[pop_index++];
#if 0
  if (pop_index >= ibuffer_len)
#else
  if (pop_index > ibuffer_len)
#endif
    pop_index = 0;

  return (1);
}

/* Stuff KEY into the *front* of the input buffer.
   Returns non-zero if successful, zero if there is
   no space left in the buffer. */
int
_rl_unget_char (int key)
{
  if (ibuffer_space ())
    {
      pop_index--;
      if (pop_index < 0)
	pop_index = ibuffer_len;
      ibuffer[pop_index] = key;
      return (1);
    }
  return (0);
}

/* If a character is available to be read, then read it and stuff it into
   IBUFFER.  Otherwise, just return.  Returns number of characters read
   (0 if none available) and -1 on error (EIO). */
static int
rl_gather_tyi (void)
{
  int tty;
  register int tem, result;
  int chars_avail, k;
  char input;
#if defined(HAVE_SELECT)
  fd_set readfds, exceptfds;
  struct timeval timeout;
#endif

  chars_avail = 0;
  input = 0;
  tty = fileno (rl_instream);

#if defined (HAVE_SELECT)
  FD_ZERO (&readfds);
  FD_ZERO (&exceptfds);
  FD_SET (tty, &readfds);
  FD_SET (tty, &exceptfds);
  USEC_TO_TIMEVAL (_keyboard_input_timeout, timeout);
  result = select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout);
  if (result <= 0)
    return 0;	/* Nothing to read. */
#endif

  result = -1;
  errno = 0;
#if defined (FIONREAD)
  result = ioctl (tty, FIONREAD, &chars_avail);
  if (result == -1 && errno == EIO)
    return -1;
  if (result == -1)
    chars_avail = 0;
#endif

#if defined (O_NDELAY)
  if (result == -1)
    {
      tem = fcntl (tty, F_GETFL, 0);

      fcntl (tty, F_SETFL, (tem | O_NDELAY));
      chars_avail = read (tty, &input, 1);

      fcntl (tty, F_SETFL, tem);
      if (chars_avail == -1 && errno == EAGAIN)
	return 0;
      if (chars_avail == -1 && errno == EIO)
	return -1;
      if (chars_avail == 0)	/* EOF */
	{
	  rl_stuff_char (EOF);
	  return (0);
	}
    }
#endif /* O_NDELAY */

#if defined (__MINGW32__)
  /* Use getch/_kbhit to check for available console input, in the same way
     that we read it normally. */
   chars_avail = isatty (tty) ? _kbhit () : 0;
   result = 0;
#endif

  /* If there's nothing available, don't waste time trying to read
     something. */
  if (chars_avail <= 0)
    return 0;

  tem = ibuffer_space ();

  if (chars_avail > tem)
    chars_avail = tem;

  /* One cannot read all of the available input.  I can only read a single
     character at a time, or else programs which require input can be
     thwarted.  If the buffer is larger than one character, I lose.
     Damn! */
  if (tem < ibuffer_len)
    chars_avail = 0;

  if (result != -1)
    {
      while (chars_avail--)
	{
	  RL_CHECK_SIGNALS ();
	  k = (*rl_getc_function) (rl_instream);
	  if (rl_stuff_char (k) == 0)
	    break;			/* some problem; no more room */
	  if (k == NEWLINE || k == RETURN)
	    break;
	}
    }
  else
    {
      if (chars_avail)
	rl_stuff_char (input);
    }

  return 1;
}

int
rl_set_keyboard_input_timeout (int u)
{
  int o;

  o = _keyboard_input_timeout;
  if (u >= 0)
    _keyboard_input_timeout = u;
  return (o);
}

/* Is there input available to be read on the readline input file
   descriptor?  Only works if the system has select(2) or FIONREAD.
   Uses the value of _keyboard_input_timeout as the timeout; if another
   readline function wants to specify a timeout and not leave it up to
   the user, it should use _rl_input_queued(timeout_value_in_microseconds)
   instead. */
int
_rl_input_available (void)
{
#if defined(HAVE_SELECT)
  fd_set readfds, exceptfds;
  struct timeval timeout;
#endif
#if !defined (HAVE_SELECT) && defined(FIONREAD)
  int chars_avail;
#endif
  int tty;

  if (rl_input_available_hook)
    return (*rl_input_available_hook) ();

  tty = fileno (rl_instream);

#if defined (HAVE_SELECT)
  FD_ZERO (&readfds);
  FD_ZERO (&exceptfds);
  FD_SET (tty, &readfds);
  FD_SET (tty, &exceptfds);
  timeout.tv_sec = 0;
  timeout.tv_usec = _keyboard_input_timeout;
  return (select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout) > 0);
#else

#if defined (FIONREAD)
  if (ioctl (tty, FIONREAD, &chars_avail) == 0)
    return (chars_avail);
#endif

#endif

#if defined (__MINGW32__)
  if (isatty (tty))
    return (_kbhit ());
#endif

  return 0;
}

int
_rl_input_queued (int t)
{
  int old_timeout, r;

  old_timeout = rl_set_keyboard_input_timeout (t);
  r = _rl_input_available ();
  rl_set_keyboard_input_timeout (old_timeout);
  return r;
}

void
_rl_insert_typein (int c)
{    	
  int key, t, i;
  char *string;

  i = key = 0;
  string = (char *)xmalloc (ibuffer_len + 1);
  string[i++] = (char) c;

  while ((t = rl_get_char (&key)) &&
	 _rl_keymap[key].type == ISFUNC &&
	 _rl_keymap[key].function == rl_insert)
    string[i++] = key;

  if (t)
    _rl_unget_char (key);

  string[i] = '\0';
  rl_insert_text (string);
  xfree (string);
}

/* Add KEY to the buffer of characters to be read.  Returns 1 if the
   character was stuffed correctly; 0 otherwise. */
int
rl_stuff_char (int key)
{
  if (ibuffer_space () == 0)
    return 0;

  if (key == EOF)
    {
      key = NEWLINE;
      rl_pending_input = EOF;
      RL_SETSTATE (RL_STATE_INPUTPENDING);
    }
  ibuffer[push_index++] = key;
#if 0
  if (push_index >= ibuffer_len)
#else
  if (push_index > ibuffer_len)
#endif
    push_index = 0;

  return 1;
}

/* Make C be the next command to be executed. */
int
rl_execute_next (int c)
{
  rl_pending_input = c;
  RL_SETSTATE (RL_STATE_INPUTPENDING);
  return 0;
}

/* Clear any pending input pushed with rl_execute_next() */
int
rl_clear_pending_input (void)
{
  rl_pending_input = 0;
  RL_UNSETSTATE (RL_STATE_INPUTPENDING);
  return 0;
}

/* **************************************************************** */
/*								    */
/*			     Character Input			    */
/*								    */
/* **************************************************************** */

/* Read a key, including pending input. */
int
rl_read_key (void)
{
  int c, r;

  if (rl_pending_input)
    {
      c = rl_pending_input;	/* XXX - cast to unsigned char if > 0? */
      rl_clear_pending_input ();
    }
  else
    {
      /* If input is coming from a macro, then use that. */
      if (c = _rl_next_macro_key ())
	return ((unsigned char)c);

      /* If the user has an event function, then call it periodically. */
      if (rl_event_hook)
	{
	  while (rl_event_hook)
	    {
	      if (rl_get_char (&c) != 0)
		break;
		
	      if ((r = rl_gather_tyi ()) < 0)	/* XXX - EIO */
		{
		  rl_done = 1;
		  return (errno == EIO ? (RL_ISSTATE (RL_STATE_READCMD) ? READERR : EOF) : '\n');
		}
	      else if (r > 0)			/* read something */
		continue;

	      RL_CHECK_SIGNALS ();
	      if (rl_done)		/* XXX - experimental */
		return ('\n');
	      (*rl_event_hook) ();
	    }
	}
      else
	{
	  if (rl_get_char (&c) == 0)
	    c = (*rl_getc_function) (rl_instream);
/* fprintf(stderr, "rl_read_key: calling RL_CHECK_SIGNALS: _rl_caught_signal = %d", _rl_caught_signal); */
	  RL_CHECK_SIGNALS ();
	}
    }

  return (c);
}

int
rl_getc (FILE *stream)
{
  int result;
  unsigned char c;
#if defined (HAVE_PSELECT)
  sigset_t empty_set;
  fd_set readfds;
#endif

  while (1)
    {
      RL_CHECK_SIGNALS ();

      /* We know at this point that _rl_caught_signal == 0 */

#if defined (__MINGW32__)
      if (isatty (fileno (stream)))
	return (_getch ());	/* "There is no error return." */
#endif
      result = 0;
#if defined (HAVE_PSELECT)
      FD_ZERO (&readfds);
      FD_SET (fileno (stream), &readfds);
#  if defined (HANDLE_SIGNALS)
      result = pselect (fileno (stream) + 1, &readfds, NULL, NULL, NULL, &_rl_orig_sigset);
#  else
      sigemptyset (&empty_set);
      sigprocmask (SIG_BLOCK, (sigset_t *)NULL, &empty_set);
      result = pselect (fileno (stream) + 1, &readfds, NULL, NULL, NULL, &empty_set);
#  endif /* HANDLE_SIGNALS */
#endif
      if (result >= 0)
	result = read (fileno (stream), &c, sizeof (unsigned char));

      if (result == sizeof (unsigned char))
	return (c);

      /* If zero characters are returned, then the file that we are
	 reading from is empty!  Return EOF in that case. */
      if (result == 0)
	return (EOF);

#if defined (__BEOS__)
      if (errno == EINTR)
	continue;
#endif

#if defined (EWOULDBLOCK)
#  define X_EWOULDBLOCK EWOULDBLOCK
#else
#  define X_EWOULDBLOCK -99
#endif

#if defined (EAGAIN)
#  define X_EAGAIN EAGAIN
#else
#  define X_EAGAIN -99
#endif

      if (errno == X_EWOULDBLOCK || errno == X_EAGAIN)
	{
	  if (sh_unset_nodelay_mode (fileno (stream)) < 0)
	    return (EOF);
	  continue;
	}

#undef X_EWOULDBLOCK
#undef X_EAGAIN

/* fprintf(stderr, "rl_getc: result = %d errno = %d\n", result, errno); */

handle_error:
      /* If the error that we received was EINTR, then try again,
	 this is simply an interrupted system call to read ().  We allow
	 the read to be interrupted if we caught SIGHUP, SIGTERM, or any
	 of the other signals readline treats specially. If the
	 application sets an event hook, call it for other signals.
	 Otherwise (not EINTR), some error occurred, also signifying EOF. */
      if (errno != EINTR)
	return (RL_ISSTATE (RL_STATE_READCMD) ? READERR : EOF);
      /* fatal signals of interest */
#if defined (SIGHUP)
      else if (_rl_caught_signal == SIGHUP || _rl_caught_signal == SIGTERM)
#else
      else if (_rl_caught_signal == SIGTERM)
#endif
	return (RL_ISSTATE (RL_STATE_READCMD) ? READERR : EOF);
      /* keyboard-generated signals of interest */
#if defined (SIGQUIT)
      else if (_rl_caught_signal == SIGINT || _rl_caught_signal == SIGQUIT)
#else
      else if (_rl_caught_signal == SIGINT)
#endif
        RL_CHECK_SIGNALS ();
      /* non-keyboard-generated signals of interest */
#if defined (SIGWINCH)
      else if (_rl_caught_signal == SIGWINCH)
	RL_CHECK_SIGNALS ();
#endif /* SIGWINCH */
#if defined (SIGALRM)
      else if (_rl_caught_signal == SIGALRM
#  if defined (SIGVTALRM)
		|| _rl_caught_signal == SIGVTALRM
#  endif
	      )
        RL_CHECK_SIGNALS ();
#endif  /* SIGALRM */

      if (rl_signal_event_hook)
	(*rl_signal_event_hook) ();
    }
}

#if defined (HANDLE_MULTIBYTE)
/* read multibyte char */
int
_rl_read_mbchar (char *mbchar, int size)
{
  int mb_len, c;
  size_t mbchar_bytes_length;
  wchar_t wc;
  mbstate_t ps, ps_back;

  memset(&ps, 0, sizeof (mbstate_t));
  memset(&ps_back, 0, sizeof (mbstate_t));

  mb_len = 0;  
  while (mb_len < size)
    {
      RL_SETSTATE(RL_STATE_MOREINPUT);
      c = rl_read_key ();
      RL_UNSETSTATE(RL_STATE_MOREINPUT);

      if (c < 0)
	break;

      mbchar[mb_len++] = c;

      mbchar_bytes_length = mbrtowc (&wc, mbchar, mb_len, &ps);
      if (mbchar_bytes_length == (size_t)(-1))
	break;		/* invalid byte sequence for the current locale */
      else if (mbchar_bytes_length == (size_t)(-2))
	{
	  /* shorted bytes */
	  ps = ps_back;
	  continue;
	} 
      else if (mbchar_bytes_length == 0)
	{
	  mbchar[0] = '\0';	/* null wide character */
	  mb_len = 1;
	  break;
	}
      else if (mbchar_bytes_length > (size_t)(0))
	break;
    }

  return mb_len;
}

/* Read a multibyte-character string whose first character is FIRST into
   the buffer MB of length MLEN.  Returns the last character read, which
   may be FIRST.  Used by the search functions, among others.  Very similar
   to _rl_read_mbchar. */
int
_rl_read_mbstring (int first, char *mb, int mlen)
{
  int i, c, n;
  mbstate_t ps;

  c = first;
  memset (mb, 0, mlen);
  for (i = 0; c >= 0 && i < mlen; i++)
    {
      mb[i] = (char)c;
      memset (&ps, 0, sizeof (mbstate_t));
      n = _rl_get_char_len (mb, &ps);
      if (n == -2)
	{
	  /* Read more for multibyte character */
	  RL_SETSTATE (RL_STATE_MOREINPUT);
	  c = rl_read_key ();
	  RL_UNSETSTATE (RL_STATE_MOREINPUT);
	}
      else
	break;
    }
  return c;
}
#endif /* HANDLE_MULTIBYTE */