File: | src/gnu/lib/libreadline/input.c |
Warning: | line 192, column 3 Value stored to 'result' is never read |
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1 | /* input.c -- character input functions for readline. */ |
2 | |
3 | /* Copyright (C) 1994 Free Software Foundation, Inc. |
4 | |
5 | This file is part of the GNU Readline Library, a library for |
6 | reading lines of text with interactive input and history editing. |
7 | |
8 | The GNU Readline Library is free software; you can redistribute it |
9 | and/or modify it under the terms of the GNU General Public License |
10 | as published by the Free Software Foundation; either version 2, or |
11 | (at your option) any later version. |
12 | |
13 | The GNU Readline Library is distributed in the hope that it will be |
14 | useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
15 | of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
16 | GNU General Public License for more details. |
17 | |
18 | The GNU General Public License is often shipped with GNU software, and |
19 | is generally kept in a file called COPYING or LICENSE. If you do not |
20 | have a copy of the license, write to the Free Software Foundation, |
21 | 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
22 | #define READLINE_LIBRARY |
23 | |
24 | #if defined (HAVE_CONFIG_H1) |
25 | # include <config.h> |
26 | #endif |
27 | |
28 | #include <sys/types.h> |
29 | #include <fcntl.h> |
30 | #if defined (HAVE_SYS_FILE_H1) |
31 | # include <sys/file.h> |
32 | #endif /* HAVE_SYS_FILE_H */ |
33 | |
34 | #if defined (HAVE_UNISTD_H1) |
35 | # include <unistd.h> |
36 | #endif /* HAVE_UNISTD_H */ |
37 | |
38 | #if defined (HAVE_STDLIB_H1) |
39 | # include <stdlib.h> |
40 | #else |
41 | # include "ansi_stdlib.h" |
42 | #endif /* HAVE_STDLIB_H */ |
43 | |
44 | #if defined (HAVE_SELECT1) |
45 | # if !defined (HAVE_SYS_SELECT_H1) || !defined (M_UNIX) |
46 | # include <sys/time.h> |
47 | # endif |
48 | #endif /* HAVE_SELECT */ |
49 | #if defined (HAVE_SYS_SELECT_H1) |
50 | # include <sys/select.h> |
51 | #endif |
52 | |
53 | #if defined (FIONREAD_IN_SYS_IOCTL1) |
54 | # include <sys/ioctl.h> |
55 | #endif |
56 | |
57 | #include <stdio.h> |
58 | #include <errno(*__errno()).h> |
59 | |
60 | #if !defined (errno(*__errno())) |
61 | extern int errno(*__errno()); |
62 | #endif /* !errno */ |
63 | |
64 | /* System-specific feature definitions and include files. */ |
65 | #include "rldefs.h" |
66 | #include "rlmbutil.h" |
67 | |
68 | /* Some standard library routines. */ |
69 | #include "readline.h" |
70 | |
71 | #include "rlprivate.h" |
72 | #include "rlshell.h" |
73 | #include "xmalloc.h" |
74 | |
75 | /* What kind of non-blocking I/O do we have? */ |
76 | #if !defined (O_NDELAY0x0004) && defined (O_NONBLOCK0x0004) |
77 | # define O_NDELAY0x0004 O_NONBLOCK0x0004 /* Posix style */ |
78 | #endif |
79 | |
80 | /* Non-null means it is a pointer to a function to run while waiting for |
81 | character input. */ |
82 | rl_hook_func_t *rl_event_hook = (rl_hook_func_t *)NULL((void *)0); |
83 | |
84 | rl_getc_func_t *rl_getc_function = rl_getc; |
85 | |
86 | static int _keyboard_input_timeout = 100000; /* 0.1 seconds; it's in usec */ |
87 | |
88 | static int ibuffer_space PARAMS((void))(void); |
89 | static int rl_get_char PARAMS((int *))(int *); |
90 | static int rl_gather_tyi PARAMS((void))(void); |
91 | |
92 | /* **************************************************************** */ |
93 | /* */ |
94 | /* Character Input Buffering */ |
95 | /* */ |
96 | /* **************************************************************** */ |
97 | |
98 | static int pop_index, push_index; |
99 | static unsigned char ibuffer[512]; |
100 | static int ibuffer_len = sizeof (ibuffer) - 1; |
101 | |
102 | #define any_typein(push_index != pop_index) (push_index != pop_index) |
103 | |
104 | int |
105 | _rl_any_typein () |
106 | { |
107 | return any_typein(push_index != pop_index); |
108 | } |
109 | |
110 | /* Return the amount of space available in the buffer for stuffing |
111 | characters. */ |
112 | static int |
113 | ibuffer_space () |
114 | { |
115 | if (pop_index > push_index) |
116 | return (pop_index - push_index - 1); |
117 | else |
118 | return (ibuffer_len - (push_index - pop_index)); |
119 | } |
120 | |
121 | /* Get a key from the buffer of characters to be read. |
122 | Return the key in KEY. |
123 | Result is KEY if there was a key, or 0 if there wasn't. */ |
124 | static int |
125 | rl_get_char (key) |
126 | int *key; |
127 | { |
128 | if (push_index == pop_index) |
129 | return (0); |
130 | |
131 | *key = ibuffer[pop_index++]; |
132 | |
133 | if (pop_index >= ibuffer_len) |
134 | pop_index = 0; |
135 | |
136 | return (1); |
137 | } |
138 | |
139 | /* Stuff KEY into the *front* of the input buffer. |
140 | Returns non-zero if successful, zero if there is |
141 | no space left in the buffer. */ |
142 | int |
143 | _rl_unget_char (key) |
144 | int key; |
145 | { |
146 | if (ibuffer_space ()) |
147 | { |
148 | pop_index--; |
149 | if (pop_index < 0) |
150 | pop_index = ibuffer_len - 1; |
151 | ibuffer[pop_index] = key; |
152 | return (1); |
153 | } |
154 | return (0); |
155 | } |
156 | |
157 | int |
158 | _rl_pushed_input_available () |
159 | { |
160 | return (push_index != pop_index); |
161 | } |
162 | |
163 | /* If a character is available to be read, then read it and stuff it into |
164 | IBUFFER. Otherwise, just return. Returns number of characters read |
165 | (0 if none available) and -1 on error (EIO). */ |
166 | static int |
167 | rl_gather_tyi () |
168 | { |
169 | int tty; |
170 | register int tem, result; |
171 | int chars_avail; |
172 | char input; |
173 | #if defined(HAVE_SELECT1) |
174 | fd_set readfds, exceptfds; |
175 | struct timeval timeout; |
176 | #endif |
177 | |
178 | tty = fileno (rl_instream)(!__isthreaded ? ((rl_instream)->_file) : (fileno)(rl_instream )); |
179 | |
180 | #if defined (HAVE_SELECT1) |
181 | FD_ZERO (&readfds)do { fd_set *_p = (&readfds); __size_t _n = (((1024) + (( ((unsigned)(sizeof(__fd_mask) * 8))) - 1)) / (((unsigned)(sizeof (__fd_mask) * 8)))); while (_n > 0) _p->fds_bits[--_n] = 0; } while (0); |
182 | FD_ZERO (&exceptfds)do { fd_set *_p = (&exceptfds); __size_t _n = (((1024) + ( (((unsigned)(sizeof(__fd_mask) * 8))) - 1)) / (((unsigned)(sizeof (__fd_mask) * 8)))); while (_n > 0) _p->fds_bits[--_n] = 0; } while (0); |
183 | FD_SET (tty, &readfds)__fd_set((tty), (&readfds)); |
184 | FD_SET (tty, &exceptfds)__fd_set((tty), (&exceptfds)); |
185 | timeout.tv_sec = 0; |
186 | timeout.tv_usec = _keyboard_input_timeout; |
187 | result = select (tty + 1, &readfds, (fd_set *)NULL((void *)0), &exceptfds, &timeout); |
188 | if (result <= 0) |
189 | return 0; /* Nothing to read. */ |
190 | #endif |
191 | |
192 | result = -1; |
Value stored to 'result' is never read | |
193 | #if defined (FIONREAD((unsigned long)0x40000000 | ((sizeof(int) & 0x1fff) << 16) | ((('f')) << 8) | ((127)))) |
194 | errno(*__errno()) = 0; |
195 | result = ioctl (tty, FIONREAD((unsigned long)0x40000000 | ((sizeof(int) & 0x1fff) << 16) | ((('f')) << 8) | ((127))), &chars_avail); |
196 | if (result == -1 && errno(*__errno()) == EIO5) |
197 | return -1; |
198 | #endif |
199 | |
200 | #if defined (O_NDELAY0x0004) |
201 | if (result == -1) |
202 | { |
203 | tem = fcntl (tty, F_GETFL3, 0); |
204 | |
205 | fcntl (tty, F_SETFL4, (tem | O_NDELAY0x0004)); |
206 | chars_avail = read (tty, &input, 1); |
207 | |
208 | fcntl (tty, F_SETFL4, tem); |
209 | if (chars_avail == -1 && errno(*__errno()) == EAGAIN35) |
210 | return 0; |
211 | } |
212 | #endif /* O_NDELAY */ |
213 | |
214 | /* If there's nothing available, don't waste time trying to read |
215 | something. */ |
216 | if (chars_avail <= 0) |
217 | return 0; |
218 | |
219 | tem = ibuffer_space (); |
220 | |
221 | if (chars_avail > tem) |
222 | chars_avail = tem; |
223 | |
224 | /* One cannot read all of the available input. I can only read a single |
225 | character at a time, or else programs which require input can be |
226 | thwarted. If the buffer is larger than one character, I lose. |
227 | Damn! */ |
228 | if (tem < ibuffer_len) |
229 | chars_avail = 0; |
230 | |
231 | if (result != -1) |
232 | { |
233 | while (chars_avail--) |
234 | rl_stuff_char ((*rl_getc_function) (rl_instream)); |
235 | } |
236 | else |
237 | { |
238 | if (chars_avail) |
239 | rl_stuff_char (input); |
240 | } |
241 | |
242 | return 1; |
243 | } |
244 | |
245 | int |
246 | rl_set_keyboard_input_timeout (u) |
247 | int u; |
248 | { |
249 | int o; |
250 | |
251 | o = _keyboard_input_timeout; |
252 | if (u > 0) |
253 | _keyboard_input_timeout = u; |
254 | return (o); |
255 | } |
256 | |
257 | /* Is there input available to be read on the readline input file |
258 | descriptor? Only works if the system has select(2) or FIONREAD. |
259 | Uses the value of _keyboard_input_timeout as the timeout; if another |
260 | readline function wants to specify a timeout and not leave it up to |
261 | the user, it should use _rl_input_queued(timeout_value_in_microseconds) |
262 | instead. */ |
263 | int |
264 | _rl_input_available () |
265 | { |
266 | #if defined(HAVE_SELECT1) |
267 | fd_set readfds, exceptfds; |
268 | struct timeval timeout; |
269 | #endif |
270 | #if !defined (HAVE_SELECT1) && defined(FIONREAD((unsigned long)0x40000000 | ((sizeof(int) & 0x1fff) << 16) | ((('f')) << 8) | ((127)))) |
271 | int chars_avail; |
272 | #endif |
273 | int tty; |
274 | |
275 | tty = fileno (rl_instream)(!__isthreaded ? ((rl_instream)->_file) : (fileno)(rl_instream )); |
276 | |
277 | #if defined (HAVE_SELECT1) |
278 | FD_ZERO (&readfds)do { fd_set *_p = (&readfds); __size_t _n = (((1024) + (( ((unsigned)(sizeof(__fd_mask) * 8))) - 1)) / (((unsigned)(sizeof (__fd_mask) * 8)))); while (_n > 0) _p->fds_bits[--_n] = 0; } while (0); |
279 | FD_ZERO (&exceptfds)do { fd_set *_p = (&exceptfds); __size_t _n = (((1024) + ( (((unsigned)(sizeof(__fd_mask) * 8))) - 1)) / (((unsigned)(sizeof (__fd_mask) * 8)))); while (_n > 0) _p->fds_bits[--_n] = 0; } while (0); |
280 | FD_SET (tty, &readfds)__fd_set((tty), (&readfds)); |
281 | FD_SET (tty, &exceptfds)__fd_set((tty), (&exceptfds)); |
282 | timeout.tv_sec = 0; |
283 | timeout.tv_usec = _keyboard_input_timeout; |
284 | return (select (tty + 1, &readfds, (fd_set *)NULL((void *)0), &exceptfds, &timeout) > 0); |
285 | #else |
286 | |
287 | #if defined (FIONREAD((unsigned long)0x40000000 | ((sizeof(int) & 0x1fff) << 16) | ((('f')) << 8) | ((127)))) |
288 | if (ioctl (tty, FIONREAD((unsigned long)0x40000000 | ((sizeof(int) & 0x1fff) << 16) | ((('f')) << 8) | ((127))), &chars_avail) == 0) |
289 | return (chars_avail); |
290 | #endif |
291 | |
292 | #endif |
293 | |
294 | return 0; |
295 | } |
296 | |
297 | int |
298 | _rl_input_queued (t) |
299 | int t; |
300 | { |
301 | int old_timeout, r; |
302 | |
303 | old_timeout = rl_set_keyboard_input_timeout (t); |
304 | r = _rl_input_available (); |
305 | rl_set_keyboard_input_timeout (old_timeout); |
306 | return r; |
307 | } |
308 | |
309 | void |
310 | _rl_insert_typein (c) |
311 | int c; |
312 | { |
313 | int key, t, i; |
314 | char *string; |
315 | |
316 | i = key = 0; |
317 | string = (char *)xmalloc (ibuffer_len + 1); |
318 | string[i++] = (char) c; |
319 | |
320 | while ((t = rl_get_char (&key)) && |
321 | _rl_keymap[key].type == ISFUNC0 && |
322 | _rl_keymap[key].function == rl_insert) |
323 | string[i++] = key; |
324 | |
325 | if (t) |
326 | _rl_unget_char (key); |
327 | |
328 | string[i] = '\0'; |
329 | rl_insert_text (string); |
330 | free (string); |
331 | } |
332 | |
333 | /* Add KEY to the buffer of characters to be read. Returns 1 if the |
334 | character was stuffed correctly; 0 otherwise. */ |
335 | int |
336 | rl_stuff_char (key) |
337 | int key; |
338 | { |
339 | if (ibuffer_space () == 0) |
340 | return 0; |
341 | |
342 | if (key == EOF(-1)) |
343 | { |
344 | key = NEWLINE'\n'; |
345 | rl_pending_input = EOF(-1); |
346 | RL_SETSTATE (RL_STATE_INPUTPENDING)(rl_readline_state |= (0x20000)); |
347 | } |
348 | ibuffer[push_index++] = key; |
349 | if (push_index >= ibuffer_len) |
350 | push_index = 0; |
351 | |
352 | return 1; |
353 | } |
354 | |
355 | /* Make C be the next command to be executed. */ |
356 | int |
357 | rl_execute_next (c) |
358 | int c; |
359 | { |
360 | rl_pending_input = c; |
361 | RL_SETSTATE (RL_STATE_INPUTPENDING)(rl_readline_state |= (0x20000)); |
362 | return 0; |
363 | } |
364 | |
365 | /* Clear any pending input pushed with rl_execute_next() */ |
366 | int |
367 | rl_clear_pending_input () |
368 | { |
369 | rl_pending_input = 0; |
370 | RL_UNSETSTATE (RL_STATE_INPUTPENDING)(rl_readline_state &= ~(0x20000)); |
371 | return 0; |
372 | } |
373 | |
374 | /* **************************************************************** */ |
375 | /* */ |
376 | /* Character Input */ |
377 | /* */ |
378 | /* **************************************************************** */ |
379 | |
380 | /* Read a key, including pending input. */ |
381 | int |
382 | rl_read_key () |
383 | { |
384 | int c; |
385 | |
386 | rl_key_sequence_length++; |
387 | |
388 | if (rl_pending_input) |
389 | { |
390 | c = rl_pending_input; |
391 | rl_clear_pending_input (); |
392 | } |
393 | else |
394 | { |
395 | /* If input is coming from a macro, then use that. */ |
396 | if ((c = _rl_next_macro_key ())) |
397 | return (c); |
398 | |
399 | /* If the user has an event function, then call it periodically. */ |
400 | if (rl_event_hook) |
401 | { |
402 | while (rl_event_hook && rl_get_char (&c) == 0) |
403 | { |
404 | (*rl_event_hook) (); |
405 | if (rl_done) /* XXX - experimental */ |
406 | return ('\n'); |
407 | if (rl_gather_tyi () < 0) /* XXX - EIO */ |
408 | { |
409 | rl_done = 1; |
410 | return ('\n'); |
411 | } |
412 | } |
413 | } |
414 | else |
415 | { |
416 | if (rl_get_char (&c) == 0) |
417 | c = (*rl_getc_function) (rl_instream); |
418 | } |
419 | } |
420 | |
421 | return (c); |
422 | } |
423 | |
424 | int |
425 | rl_getc (stream) |
426 | FILE *stream; |
427 | { |
428 | int result; |
429 | unsigned char c; |
430 | |
431 | while (1) |
432 | { |
433 | result = read (fileno (stream)(!__isthreaded ? ((stream)->_file) : (fileno)(stream)), &c, sizeof (unsigned char)); |
434 | |
435 | if (result == sizeof (unsigned char)) |
436 | return (c); |
437 | |
438 | /* If zero characters are returned, then the file that we are |
439 | reading from is empty! Return EOF in that case. */ |
440 | if (result == 0) |
441 | return (EOF(-1)); |
442 | |
443 | #if defined (__BEOS__) |
444 | if (errno(*__errno()) == EINTR4) |
445 | continue; |
446 | #endif |
447 | |
448 | #if defined (EWOULDBLOCK35) |
449 | # define X_EWOULDBLOCK EWOULDBLOCK35 |
450 | #else |
451 | # define X_EWOULDBLOCK -99 |
452 | #endif |
453 | |
454 | #if defined (EAGAIN35) |
455 | # define X_EAGAIN EAGAIN35 |
456 | #else |
457 | # define X_EAGAIN -99 |
458 | #endif |
459 | |
460 | if (errno(*__errno()) == X_EWOULDBLOCK || errno(*__errno()) == X_EAGAIN) |
461 | { |
462 | if (sh_unset_nodelay_mode (fileno (stream)(!__isthreaded ? ((stream)->_file) : (fileno)(stream))) < 0) |
463 | return (EOF(-1)); |
464 | continue; |
465 | } |
466 | |
467 | #undef X_EWOULDBLOCK |
468 | #undef X_EAGAIN |
469 | |
470 | /* If the error that we received was SIGINT, then try again, |
471 | this is simply an interrupted system call to read (). |
472 | Otherwise, some error ocurred, also signifying EOF. */ |
473 | if (errno(*__errno()) != EINTR4) |
474 | return (EOF(-1)); |
475 | } |
476 | } |
477 | |
478 | #if defined (HANDLE_MULTIBYTE) |
479 | /* read multibyte char */ |
480 | int |
481 | _rl_read_mbchar (mbchar, size) |
482 | char *mbchar; |
483 | int size; |
484 | { |
485 | int mb_len = 0; |
486 | size_t mbchar_bytes_length; |
487 | wchar_t wc; |
488 | mbstate_t ps, ps_back; |
489 | |
490 | memset(&ps, 0, sizeof (mbstate_t)); |
491 | memset(&ps_back, 0, sizeof (mbstate_t)); |
492 | |
493 | while (mb_len < size) |
494 | { |
495 | RL_SETSTATE(RL_STATE_MOREINPUT)(rl_readline_state |= (0x00040)); |
496 | mbchar[mb_len++] = rl_read_key (); |
497 | RL_UNSETSTATE(RL_STATE_MOREINPUT)(rl_readline_state &= ~(0x00040)); |
498 | |
499 | mbchar_bytes_length = mbrtowc (&wc, mbchar, mb_len, &ps); |
500 | if (mbchar_bytes_length == (size_t)(-1)) |
501 | break; /* invalid byte sequence for the current locale */ |
502 | else if (mbchar_bytes_length == (size_t)(-2)) |
503 | { |
504 | /* shorted bytes */ |
505 | ps = ps_back; |
506 | continue; |
507 | } |
508 | else if (mbchar_bytes_length > (size_t)(0)) |
509 | break; |
510 | } |
511 | |
512 | return mb_len; |
513 | } |
514 | |
515 | /* Read a multibyte-character string whose first character is FIRST into |
516 | the buffer MB of length MBLEN. Returns the last character read, which |
517 | may be FIRST. Used by the search functions, among others. Very similar |
518 | to _rl_read_mbchar. */ |
519 | int |
520 | _rl_read_mbstring (first, mb, mblen) |
521 | int first; |
522 | char *mb; |
523 | int mblen; |
524 | { |
525 | int i, c; |
526 | mbstate_t ps; |
527 | |
528 | c = first; |
529 | memset (mb, 0, mblen); |
530 | for (i = 0; i < mblen; i++) |
531 | { |
532 | mb[i] = (char)c; |
533 | memset (&ps, 0, sizeof (mbstate_t)); |
534 | if (_rl_get_char_len (mb, &ps) == -2) |
535 | { |
536 | /* Read more for multibyte character */ |
537 | RL_SETSTATE (RL_STATE_MOREINPUT)(rl_readline_state |= (0x00040)); |
538 | c = rl_read_key (); |
539 | RL_UNSETSTATE (RL_STATE_MOREINPUT)(rl_readline_state &= ~(0x00040)); |
540 | } |
541 | else |
542 | break; |
543 | } |
544 | return c; |
545 | } |
546 | #endif /* HANDLE_MULTIBYTE */ |