aboutsummaryrefslogtreecommitdiff
path: root/readline/input.c
blob: 7e3c0feb5ce8b0a7f6a4d053794e058d3cdd661a (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
/* input.c -- character input functions for readline. */

/* Copyright (C) 1994 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,
   675 Mass Ave, Cambridge, MA 02139, USA. */
#define READLINE_LIBRARY

#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 */

#if defined (HAVE_SELECT)
#  if !defined (HAVE_SYS_SELECT_H) || !defined (M_UNIX)
#    include <sys/time.h>
#  endif
#endif /* HAVE_SELECT */
#if defined (HAVE_SYS_SELECT_H)
#  include <sys/select.h>
#endif

#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"

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

/* Functions imported from other files in the library. */
extern char *xmalloc (), *xrealloc ();

/* Variables and functions from macro.c. */
extern void _rl_add_macro_char ();
extern void _rl_with_macro_input ();
extern int _rl_next_macro_key ();
extern int _rl_defining_kbd_macro;

#if defined (VI_MODE)
extern void _rl_vi_set_last ();
extern int _rl_vi_textmod_command ();
#endif /* VI_MODE */

extern FILE *rl_instream, *rl_outstream;
extern Function *rl_last_func;
extern int rl_key_sequence_length;
extern int rl_pending_input;
extern int rl_editing_mode;

extern Keymap _rl_keymap;

extern int _rl_convert_meta_chars_to_ascii;

#if defined (__GO32__)
#  include <pc.h>
#endif /* __GO32__ */

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

Function *rl_getc_function = rl_getc;

/* **************************************************************** */
/*								    */
/*			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 ()
{
  return any_typein;
}

/* Add KEY to the buffer of characters to be read. */
int
rl_stuff_char (key)
     int key;
{
  if (key == EOF)
    {
      key = NEWLINE;
      rl_pending_input = EOF;
    }
  ibuffer[push_index++] = key;
  if (push_index >= ibuffer_len)
    push_index = 0;
  return push_index;
}

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

/* Return the amount of space available in the
   buffer for stuffing characters. */
static int
ibuffer_space ()
{
  if (pop_index > push_index)
    return (pop_index - push_index);
  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 KEY if there was a key, or 0 if there wasn't. */
static int
rl_get_char (key)
     int *key;
{
  if (push_index == pop_index)
    return (0);

  *key = ibuffer[pop_index++];

  if (pop_index >= ibuffer_len)
    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. */
static int
rl_unget_char (key)
     int key;
{
  if (ibuffer_space ())
    {
      pop_index--;
      if (pop_index < 0)
	pop_index = ibuffer_len - 1;
      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. */
static void
rl_gather_tyi ()
{
#if defined (__GO32__)
  char input;

  if (isatty (0) && kbhit () && ibuffer_space ())
    {
      int i;
      i = (*rl_getc_function) (rl_instream);
      rl_stuff_char (i);
    }
#else /* !__GO32__ */

  int tty;
  register int tem, result;
  int chars_avail;
  char input;
#if defined(HAVE_SELECT)
  fd_set readfds, exceptfds;
  struct timeval timeout;
#endif

  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 = 100000;	/* 0.1 seconds */
  if (select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout) <= 0)
    return;	/* Nothing to read. */
#endif

  result = -1;
#if defined (FIONREAD)
  result = ioctl (tty, FIONREAD, &chars_avail);
#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;
    }
#endif /* O_NDELAY */

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

  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_stuff_char ((*rl_getc_function) (rl_instream));
    }
  else
    {
      if (chars_avail)
	rl_stuff_char (input);
    }
#endif /* !__GO32__ */
}

/* Is there input available to be read on the readline input file
   descriptor?  Only works if the system has select(2) or FIONREAD. */
int
_rl_input_available ()
{
#if defined(HAVE_SELECT)
  fd_set readfds, exceptfds;
  struct timeval timeout;
#endif
#if defined(FIONREAD)
  int chars_avail;
#endif
  int tty;

  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 = 100000;	/* 0.1 seconds */
  return (select (tty + 1, &readfds, (fd_set *)NULL, &exceptfds, &timeout) > 0);
#endif

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

  return 0;
}

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

  i = key = 0;
  string = 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);
  free (string);
}

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

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

  rl_key_sequence_length++;

  if (rl_pending_input)
    {
      c = rl_pending_input;
      rl_pending_input = 0;
    }
  else
    {
      /* If input is coming from a macro, then use that. */
      if (c = _rl_next_macro_key ())
	return (c);

      /* If the user has an event function, then call it periodically. */
      if (rl_event_hook)
	{
	  while (rl_event_hook && rl_get_char (&c) == 0)
	    {
	      (*rl_event_hook) ();
	      rl_gather_tyi ();
	    }
	}
      else
	{
	  if (rl_get_char (&c) == 0)
	    c = (*rl_getc_function) (rl_instream);
	}
    }

  return (c);
}

int
rl_getc (stream)
     FILE *stream;
{
  int result, flags;
  unsigned char c;

#if defined (__GO32__)
  if (isatty (0))
    return (getkey () & 0x7F);
#endif /* __GO32__ */

  while (1)
    {
      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 (EWOULDBLOCK)
      if (errno == EWOULDBLOCK)
	{
	  if ((flags = fcntl (fileno (stream), F_GETFL, 0)) < 0)
	    return (EOF);
	  if (flags & O_NDELAY)
	    {
	      flags &= ~O_NDELAY;
	      fcntl (fileno (stream), F_SETFL, flags);
	      continue;
	    }
	  continue;
	}
#endif /* EWOULDBLOCK */

#if defined (_POSIX_VERSION) && defined (EAGAIN) && defined (O_NONBLOCK)
      if (errno == EAGAIN)
	{
	  if ((flags = fcntl (fileno (stream), F_GETFL, 0)) < 0)
	    return (EOF);
	  if (flags & O_NONBLOCK)
	    {
	      flags &= ~O_NONBLOCK;
	      fcntl (fileno (stream), F_SETFL, flags);
	      continue;
	    }
	}
#endif /* _POSIX_VERSION && EAGAIN && O_NONBLOCK */

#if !defined (__GO32__)
      /* If the error that we received was SIGINT, then try again,
	 this is simply an interrupted system call to read ().
	 Otherwise, some error ocurred, also signifying EOF. */
      if (errno != EINTR)
	return (EOF);
#endif /* !__GO32__ */
    }
}