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Commit | Line | Data |
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726f6388 JA |
1 | /* input.c -- functions to perform buffered input with synchronization. */ |
2 | ||
3185942a | 3 | /* Copyright (C) 1992-2009 Free Software Foundation, Inc. |
726f6388 JA |
4 | |
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
3185942a JA |
7 | Bash is free software: you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation, either version 3 of the License, or | |
10 | (at your option) any later version. | |
726f6388 | 11 | |
3185942a JA |
12 | Bash is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
726f6388 | 16 | |
3185942a JA |
17 | You should have received a copy of the GNU General Public License |
18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. | |
19 | */ | |
726f6388 | 20 | |
ccc6cda3 | 21 | #include "config.h" |
726f6388 JA |
22 | |
23 | #include "bashtypes.h" | |
b80f6443 | 24 | #if !defined (_MINIX) && defined (HAVE_SYS_FILE_H) |
cce855bc JA |
25 | # include <sys/file.h> |
26 | #endif | |
726f6388 JA |
27 | #include "filecntl.h" |
28 | #include "posixstat.h" | |
29 | #include <stdio.h> | |
30 | #include <errno.h> | |
31 | ||
ccc6cda3 JA |
32 | #if defined (HAVE_UNISTD_H) |
33 | # include <unistd.h> | |
34 | #endif | |
35 | ||
726f6388 | 36 | #include "bashansi.h" |
b80f6443 JA |
37 | #include "bashintl.h" |
38 | ||
726f6388 JA |
39 | #include "command.h" |
40 | #include "general.h" | |
41 | #include "input.h" | |
ccc6cda3 JA |
42 | #include "error.h" |
43 | #include "externs.h" | |
0628567a | 44 | #include "quit.h" |
ac50fbac | 45 | #include "trap.h" |
726f6388 JA |
46 | |
47 | #if !defined (errno) | |
48 | extern int errno; | |
49 | #endif /* !errno */ | |
50 | ||
3185942a JA |
51 | #if defined (EAGAIN) |
52 | # define X_EAGAIN EAGAIN | |
53 | #else | |
54 | # define X_EAGAIN -99 | |
55 | #endif | |
56 | ||
57 | #if defined (EWOULDBLOCK) | |
58 | # define X_EWOULDBLOCK EWOULDBLOCK | |
59 | #else | |
60 | # define X_EWOULDBLOCK -99 | |
61 | #endif | |
62 | ||
0628567a JA |
63 | extern void termsig_handler __P((int)); |
64 | ||
ccc6cda3 JA |
65 | /* Functions to handle reading input on systems that don't restart read(2) |
66 | if a signal is received. */ | |
67 | ||
f73dda09 | 68 | static char localbuf[128]; |
95732b49 | 69 | static int local_index = 0, local_bufused = 0; |
ccc6cda3 JA |
70 | |
71 | /* Posix and USG systems do not guarantee to restart read () if it is | |
72 | interrupted by a signal. We do the read ourselves, and restart it | |
73 | if it returns EINTR. */ | |
74 | int | |
75 | getc_with_restart (stream) | |
76 | FILE *stream; | |
77 | { | |
f73dda09 JA |
78 | unsigned char uc; |
79 | ||
0628567a JA |
80 | CHECK_TERMSIG; |
81 | ||
ccc6cda3 JA |
82 | /* Try local buffering to reduce the number of read(2) calls. */ |
83 | if (local_index == local_bufused || local_bufused == 0) | |
84 | { | |
85 | while (1) | |
86 | { | |
ac50fbac CR |
87 | QUIT; |
88 | run_pending_traps (); | |
89 | ||
ccc6cda3 JA |
90 | local_bufused = read (fileno (stream), localbuf, sizeof(localbuf)); |
91 | if (local_bufused > 0) | |
92 | break; | |
ac50fbac CR |
93 | else if (local_bufused == 0) |
94 | { | |
95 | local_index = 0; | |
96 | return EOF; | |
97 | } | |
3185942a JA |
98 | else if (errno == X_EAGAIN || errno == X_EWOULDBLOCK) |
99 | { | |
100 | if (sh_unset_nodelay_mode (fileno (stream)) < 0) | |
101 | { | |
102 | sys_error (_("cannot reset nodelay mode for fd %d"), fileno (stream)); | |
ac50fbac | 103 | local_index = local_bufused = 0; |
3185942a JA |
104 | return EOF; |
105 | } | |
106 | continue; | |
107 | } | |
ac50fbac | 108 | else if (errno != EINTR) |
ccc6cda3 | 109 | { |
ac50fbac | 110 | local_index = local_bufused = 0; |
ccc6cda3 JA |
111 | return EOF; |
112 | } | |
ac50fbac CR |
113 | else if (interrupt_state || terminating_signal) /* QUIT; */ |
114 | local_index = local_bufused = 0; | |
ccc6cda3 JA |
115 | } |
116 | local_index = 0; | |
117 | } | |
f73dda09 JA |
118 | uc = localbuf[local_index++]; |
119 | return uc; | |
ccc6cda3 JA |
120 | } |
121 | ||
122 | int | |
123 | ungetc_with_restart (c, stream) | |
124 | int c; | |
125 | FILE *stream; | |
126 | { | |
127 | if (local_index == 0 || c == EOF) | |
128 | return EOF; | |
f73dda09 JA |
129 | localbuf[--local_index] = c; |
130 | return c; | |
ccc6cda3 | 131 | } |
ccc6cda3 JA |
132 | |
133 | #if defined (BUFFERED_INPUT) | |
134 | ||
135 | /* A facility similar to stdio, but input-only. */ | |
136 | ||
bb70624e JA |
137 | #if defined (USING_BASH_MALLOC) |
138 | # define MAX_INPUT_BUFFER_SIZE 8176 | |
139 | #else | |
140 | # define MAX_INPUT_BUFFER_SIZE 8192 | |
141 | #endif | |
726f6388 JA |
142 | |
143 | #if !defined (SEEK_CUR) | |
144 | # define SEEK_CUR 1 | |
145 | #endif /* !SEEK_CUR */ | |
146 | ||
28ef6c31 JA |
147 | #ifdef max |
148 | # undef max | |
149 | #endif | |
150 | #define max(a, b) (((a) > (b)) ? (a) : (b)) | |
151 | #ifdef min | |
152 | # undef min | |
153 | #endif | |
154 | #define min(a, b) ((a) > (b) ? (b) : (a)) | |
155 | ||
726f6388 JA |
156 | extern int interactive_shell; |
157 | ||
158 | int bash_input_fd_changed; | |
ccc6cda3 | 159 | |
726f6388 JA |
160 | /* This provides a way to map from a file descriptor to the buffer |
161 | associated with that file descriptor, rather than just the other | |
162 | way around. This is needed so that buffers are managed properly | |
163 | in constructs like 3<&4. buffers[x]->b_fd == x -- that is how the | |
164 | correspondence is maintained. */ | |
cce855bc | 165 | static BUFFERED_STREAM **buffers = (BUFFERED_STREAM **)NULL; |
ccc6cda3 | 166 | static int nbuffers; |
726f6388 | 167 | |
726f6388 JA |
168 | #define ALLOCATE_BUFFERS(n) \ |
169 | do { if ((n) >= nbuffers) allocate_buffers (n); } while (0) | |
170 | ||
171 | /* Make sure `buffers' has at least N elements. */ | |
172 | static void | |
173 | allocate_buffers (n) | |
174 | int n; | |
175 | { | |
176 | register int i, orig_nbuffers; | |
177 | ||
178 | orig_nbuffers = nbuffers; | |
179 | nbuffers = n + 20; | |
180 | buffers = (BUFFERED_STREAM **)xrealloc | |
181 | (buffers, nbuffers * sizeof (BUFFERED_STREAM *)); | |
182 | ||
183 | /* Zero out the new buffers. */ | |
184 | for (i = orig_nbuffers; i < nbuffers; i++) | |
185 | buffers[i] = (BUFFERED_STREAM *)NULL; | |
186 | } | |
187 | ||
188 | /* Construct and return a BUFFERED_STREAM corresponding to file descriptor | |
189 | FD, using BUFFER. */ | |
190 | static BUFFERED_STREAM * | |
191 | make_buffered_stream (fd, buffer, bufsize) | |
192 | int fd; | |
193 | char *buffer; | |
cce855bc | 194 | size_t bufsize; |
726f6388 JA |
195 | { |
196 | BUFFERED_STREAM *bp; | |
197 | ||
198 | bp = (BUFFERED_STREAM *)xmalloc (sizeof (BUFFERED_STREAM)); | |
199 | ALLOCATE_BUFFERS (fd); | |
200 | buffers[fd] = bp; | |
201 | bp->b_fd = fd; | |
202 | bp->b_buffer = buffer; | |
203 | bp->b_size = bufsize; | |
ccc6cda3 | 204 | bp->b_used = bp->b_inputp = bp->b_flag = 0; |
726f6388 JA |
205 | if (bufsize == 1) |
206 | bp->b_flag |= B_UNBUFF; | |
495aee44 CR |
207 | if (O_TEXT && (fcntl (fd, F_GETFL) & O_TEXT) != 0) |
208 | bp->b_flag |= O_TEXT; | |
726f6388 JA |
209 | return (bp); |
210 | } | |
211 | ||
212 | /* Allocate a new BUFFERED_STREAM, copy BP to it, and return the new copy. */ | |
213 | static BUFFERED_STREAM * | |
214 | copy_buffered_stream (bp) | |
215 | BUFFERED_STREAM *bp; | |
216 | { | |
217 | BUFFERED_STREAM *nbp; | |
218 | ||
219 | if (!bp) | |
220 | return ((BUFFERED_STREAM *)NULL); | |
221 | ||
222 | nbp = (BUFFERED_STREAM *)xmalloc (sizeof (BUFFERED_STREAM)); | |
223 | xbcopy ((char *)bp, (char *)nbp, sizeof (BUFFERED_STREAM)); | |
224 | return (nbp); | |
225 | } | |
226 | ||
28ef6c31 JA |
227 | int |
228 | set_bash_input_fd (fd) | |
229 | int fd; | |
230 | { | |
231 | if (bash_input.type == st_bstream) | |
232 | bash_input.location.buffered_fd = fd; | |
233 | else if (interactive_shell == 0) | |
234 | default_buffered_input = fd; | |
235 | return 0; | |
236 | } | |
237 | ||
238 | int | |
239 | fd_is_bash_input (fd) | |
240 | int fd; | |
241 | { | |
242 | if (bash_input.type == st_bstream && bash_input.location.buffered_fd == fd) | |
243 | return 1; | |
244 | else if (interactive_shell == 0 && default_buffered_input == fd) | |
245 | return 1; | |
246 | return 0; | |
247 | } | |
248 | ||
249 | /* Save the buffered stream corresponding to file descriptor FD (which bash | |
250 | is using to read input) to a buffered stream associated with NEW_FD. If | |
251 | NEW_FD is -1, a new file descriptor is allocated with fcntl. The new | |
252 | file descriptor is returned on success, -1 on error. */ | |
253 | int | |
254 | save_bash_input (fd, new_fd) | |
255 | int fd, new_fd; | |
256 | { | |
257 | int nfd; | |
258 | ||
259 | /* Sync the stream so we can re-read from the new file descriptor. We | |
260 | might be able to avoid this by copying the buffered stream verbatim | |
261 | to the new file descriptor. */ | |
262 | if (buffers[fd]) | |
263 | sync_buffered_stream (fd); | |
264 | ||
265 | /* Now take care of duplicating the file descriptor that bash is | |
266 | using for input, so we can reinitialize it later. */ | |
267 | nfd = (new_fd == -1) ? fcntl (fd, F_DUPFD, 10) : new_fd; | |
268 | if (nfd == -1) | |
269 | { | |
270 | if (fcntl (fd, F_GETFD, 0) == 0) | |
b80f6443 | 271 | sys_error (_("cannot allocate new file descriptor for bash input from fd %d"), fd); |
28ef6c31 JA |
272 | return -1; |
273 | } | |
274 | ||
275 | if (buffers[nfd]) | |
276 | { | |
277 | /* What's this? A stray buffer without an associated open file | |
278 | descriptor? Free up the buffer and report the error. */ | |
b80f6443 | 279 | internal_error (_("save_bash_input: buffer already exists for new fd %d"), nfd); |
28ef6c31 JA |
280 | free_buffered_stream (buffers[nfd]); |
281 | } | |
282 | ||
283 | /* Reinitialize bash_input.location. */ | |
284 | if (bash_input.type == st_bstream) | |
285 | { | |
286 | bash_input.location.buffered_fd = nfd; | |
287 | fd_to_buffered_stream (nfd); | |
288 | close_buffered_fd (fd); /* XXX */ | |
289 | } | |
290 | else | |
291 | /* If the current input type is not a buffered stream, but the shell | |
292 | is not interactive and therefore using a buffered stream to read | |
293 | input (e.g. with an `eval exec 3>output' inside a script), note | |
294 | that the input fd has been changed. pop_stream() looks at this | |
295 | value and adjusts the input fd to the new value of | |
296 | default_buffered_input accordingly. */ | |
297 | bash_input_fd_changed++; | |
298 | ||
299 | if (default_buffered_input == fd) | |
300 | default_buffered_input = nfd; | |
301 | ||
302 | SET_CLOSE_ON_EXEC (nfd); | |
303 | return nfd; | |
304 | } | |
305 | ||
726f6388 JA |
306 | /* Check that file descriptor FD is not the one that bash is currently |
307 | using to read input from a script. FD is about to be duplicated onto, | |
308 | which means that the kernel will close it for us. If FD is the bash | |
309 | input file descriptor, we need to seek backwards in the script (if | |
310 | possible and necessary -- scripts read from stdin are still unbuffered), | |
311 | allocate a new file descriptor to use for bash input, and re-initialize | |
28ef6c31 JA |
312 | the buffered stream. Make sure the file descriptor used to save bash |
313 | input is set close-on-exec. Returns 0 on success, -1 on failure. This | |
314 | works only if fd is > 0 -- if fd == 0 and bash is reading input from | |
ac50fbac | 315 | fd 0, sync_buffered_stream is used instead, to cooperate with input |
28ef6c31 | 316 | redirection (look at redir.c:add_undo_redirect()). */ |
726f6388 JA |
317 | int |
318 | check_bash_input (fd) | |
319 | int fd; | |
320 | { | |
b80f6443 JA |
321 | if (fd_is_bash_input (fd)) |
322 | { | |
323 | if (fd > 0) | |
324 | return ((save_bash_input (fd, -1) == -1) ? -1 : 0); | |
325 | else if (fd == 0) | |
326 | return ((sync_buffered_stream (fd) == -1) ? -1 : 0); | |
327 | } | |
726f6388 JA |
328 | return 0; |
329 | } | |
330 | ||
331 | /* This is the buffered stream analogue of dup2(fd1, fd2). The | |
332 | BUFFERED_STREAM corresponding to fd2 is deallocated, if one exists. | |
333 | BUFFERS[fd1] is copied to BUFFERS[fd2]. This is called by the | |
334 | redirect code for constructs like 4<&0 and 3</etc/rc.local. */ | |
ccc6cda3 | 335 | int |
726f6388 JA |
336 | duplicate_buffered_stream (fd1, fd2) |
337 | int fd1, fd2; | |
338 | { | |
339 | int is_bash_input, m; | |
340 | ||
341 | if (fd1 == fd2) | |
342 | return 0; | |
343 | ||
344 | m = max (fd1, fd2); | |
345 | ALLOCATE_BUFFERS (m); | |
346 | ||
347 | /* If FD2 is the file descriptor bash is currently using for shell input, | |
348 | we need to do some extra work to make sure that the buffered stream | |
349 | actually exists (it might not if fd1 was not active, and the copy | |
350 | didn't actually do anything). */ | |
351 | is_bash_input = (bash_input.type == st_bstream) && | |
352 | (bash_input.location.buffered_fd == fd2); | |
353 | ||
354 | if (buffers[fd2]) | |
95732b49 JA |
355 | { |
356 | /* If the two objects share the same b_buffer, don't free it. */ | |
357 | if (buffers[fd1] && buffers[fd1]->b_buffer && buffers[fd1]->b_buffer == buffers[fd2]->b_buffer) | |
358 | buffers[fd2] = (BUFFERED_STREAM *)NULL; | |
359 | else | |
360 | free_buffered_stream (buffers[fd2]); | |
361 | } | |
726f6388 JA |
362 | buffers[fd2] = copy_buffered_stream (buffers[fd1]); |
363 | if (buffers[fd2]) | |
364 | buffers[fd2]->b_fd = fd2; | |
365 | ||
28ef6c31 JA |
366 | if (is_bash_input) |
367 | { | |
368 | if (!buffers[fd2]) | |
369 | fd_to_buffered_stream (fd2); | |
370 | buffers[fd2]->b_flag |= B_WASBASHINPUT; | |
371 | } | |
ccc6cda3 | 372 | |
726f6388 JA |
373 | return (fd2); |
374 | } | |
375 | ||
376 | /* Return 1 if a seek on FD will succeed. */ | |
495aee44 | 377 | #define fd_is_seekable(fd) (lseek ((fd), 0L, SEEK_CUR) >= 0) |
726f6388 JA |
378 | |
379 | /* Take FD, a file descriptor, and create and return a buffered stream | |
380 | corresponding to it. If something is wrong and the file descriptor | |
381 | is invalid, return a NULL stream. */ | |
382 | BUFFERED_STREAM * | |
383 | fd_to_buffered_stream (fd) | |
384 | int fd; | |
385 | { | |
386 | char *buffer; | |
cce855bc | 387 | size_t size; |
726f6388 JA |
388 | struct stat sb; |
389 | ||
390 | if (fstat (fd, &sb) < 0) | |
391 | { | |
392 | close (fd); | |
393 | return ((BUFFERED_STREAM *)NULL); | |
394 | } | |
395 | ||
28ef6c31 JA |
396 | size = (fd_is_seekable (fd)) ? min (sb.st_size, MAX_INPUT_BUFFER_SIZE) : 1; |
397 | if (size == 0) | |
726f6388 | 398 | size = 1; |
726f6388 JA |
399 | buffer = (char *)xmalloc (size); |
400 | ||
401 | return (make_buffered_stream (fd, buffer, size)); | |
402 | } | |
403 | ||
404 | /* Return a buffered stream corresponding to FILE, a file name. */ | |
405 | BUFFERED_STREAM * | |
406 | open_buffered_stream (file) | |
407 | char *file; | |
408 | { | |
409 | int fd; | |
410 | ||
411 | fd = open (file, O_RDONLY); | |
ccc6cda3 | 412 | return ((fd >= 0) ? fd_to_buffered_stream (fd) : (BUFFERED_STREAM *)NULL); |
726f6388 JA |
413 | } |
414 | ||
415 | /* Deallocate a buffered stream and free up its resources. Make sure we | |
416 | zero out the slot in BUFFERS that points to BP. */ | |
417 | void | |
418 | free_buffered_stream (bp) | |
419 | BUFFERED_STREAM *bp; | |
420 | { | |
421 | int n; | |
422 | ||
423 | if (!bp) | |
424 | return; | |
425 | ||
426 | n = bp->b_fd; | |
427 | if (bp->b_buffer) | |
428 | free (bp->b_buffer); | |
429 | free (bp); | |
430 | buffers[n] = (BUFFERED_STREAM *)NULL; | |
431 | } | |
432 | ||
433 | /* Close the file descriptor associated with BP, a buffered stream, and free | |
434 | up the stream. Return the status of closing BP's file descriptor. */ | |
435 | int | |
436 | close_buffered_stream (bp) | |
437 | BUFFERED_STREAM *bp; | |
438 | { | |
439 | int fd; | |
440 | ||
441 | if (!bp) | |
442 | return (0); | |
443 | fd = bp->b_fd; | |
444 | free_buffered_stream (bp); | |
445 | return (close (fd)); | |
446 | } | |
447 | ||
448 | /* Deallocate the buffered stream associated with file descriptor FD, and | |
449 | close FD. Return the status of the close on FD. */ | |
450 | int | |
451 | close_buffered_fd (fd) | |
452 | int fd; | |
453 | { | |
f73dda09 JA |
454 | if (fd < 0) |
455 | { | |
456 | errno = EBADF; | |
457 | return -1; | |
458 | } | |
726f6388 JA |
459 | if (fd >= nbuffers || !buffers || !buffers[fd]) |
460 | return (close (fd)); | |
461 | return (close_buffered_stream (buffers[fd])); | |
462 | } | |
463 | ||
ac50fbac | 464 | /* Make the BUFFERED_STREAM associated with buffers[FD] be BP, and return |
cce855bc JA |
465 | the old BUFFERED_STREAM. */ |
466 | BUFFERED_STREAM * | |
467 | set_buffered_stream (fd, bp) | |
468 | int fd; | |
469 | BUFFERED_STREAM *bp; | |
470 | { | |
471 | BUFFERED_STREAM *ret; | |
472 | ||
473 | ret = buffers[fd]; | |
474 | buffers[fd] = bp; | |
475 | return ret; | |
476 | } | |
477 | ||
726f6388 JA |
478 | /* Read a buffer full of characters from BP, a buffered stream. */ |
479 | static int | |
480 | b_fill_buffer (bp) | |
481 | BUFFERED_STREAM *bp; | |
482 | { | |
f73dda09 | 483 | ssize_t nr; |
495aee44 | 484 | off_t o; |
f73dda09 | 485 | |
0628567a | 486 | CHECK_TERMSIG; |
495aee44 CR |
487 | /* In an environment where text and binary files are treated differently, |
488 | compensate for lseek() on text files returning an offset different from | |
489 | the count of characters read() returns. Text-mode streams have to be | |
490 | treated as unbuffered. */ | |
491 | if ((bp->b_flag & (B_TEXT | B_UNBUFF)) == B_TEXT) | |
492 | { | |
493 | o = lseek (bp->b_fd, 0, SEEK_CUR); | |
494 | nr = zread (bp->b_fd, bp->b_buffer, bp->b_size); | |
495 | if (nr > 0 && nr < lseek (bp->b_fd, 0, SEEK_CUR) - o) | |
496 | { | |
497 | lseek (bp->b_fd, o, SEEK_SET); | |
498 | bp->b_flag |= B_UNBUFF; | |
499 | bp->b_size = 1; | |
500 | nr = zread (bp->b_fd, bp->b_buffer, bp->b_size); | |
501 | } | |
502 | } | |
503 | else | |
504 | nr = zread (bp->b_fd, bp->b_buffer, bp->b_size); | |
f73dda09 | 505 | if (nr <= 0) |
726f6388 | 506 | { |
f73dda09 | 507 | bp->b_used = 0; |
726f6388 | 508 | bp->b_buffer[0] = 0; |
f73dda09 | 509 | if (nr == 0) |
726f6388 JA |
510 | bp->b_flag |= B_EOF; |
511 | else | |
512 | bp->b_flag |= B_ERROR; | |
513 | return (EOF); | |
514 | } | |
f73dda09 | 515 | |
f73dda09 | 516 | bp->b_used = nr; |
726f6388 JA |
517 | bp->b_inputp = 0; |
518 | return (bp->b_buffer[bp->b_inputp++] & 0xFF); | |
519 | } | |
520 | ||
521 | /* Get a character from buffered stream BP. */ | |
522 | #define bufstream_getc(bp) \ | |
523 | (bp->b_inputp == bp->b_used || !bp->b_used) \ | |
524 | ? b_fill_buffer (bp) \ | |
525 | : bp->b_buffer[bp->b_inputp++] & 0xFF | |
526 | ||
527 | /* Push C back onto buffered stream BP. */ | |
528 | static int | |
529 | bufstream_ungetc(c, bp) | |
530 | int c; | |
531 | BUFFERED_STREAM *bp; | |
532 | { | |
533 | if (c == EOF || bp->b_inputp == 0) | |
534 | return (EOF); | |
535 | ||
536 | bp->b_buffer[--bp->b_inputp] = c; | |
537 | return (c); | |
538 | } | |
539 | ||
540 | /* Seek backwards on file BFD to synchronize what we've read so far | |
541 | with the underlying file pointer. */ | |
542 | int | |
543 | sync_buffered_stream (bfd) | |
544 | int bfd; | |
545 | { | |
546 | BUFFERED_STREAM *bp; | |
ccc6cda3 | 547 | off_t chars_left; |
726f6388 | 548 | |
28ef6c31 | 549 | if (buffers == 0 || (bp = buffers[bfd]) == 0) |
726f6388 | 550 | return (-1); |
28ef6c31 | 551 | |
726f6388 JA |
552 | chars_left = bp->b_used - bp->b_inputp; |
553 | if (chars_left) | |
554 | lseek (bp->b_fd, -chars_left, SEEK_CUR); | |
555 | bp->b_used = bp->b_inputp = 0; | |
556 | return (0); | |
557 | } | |
558 | ||
559 | int | |
560 | buffered_getchar () | |
561 | { | |
0628567a JA |
562 | CHECK_TERMSIG; |
563 | ||
28ef6c31 | 564 | #if !defined (DJGPP) |
726f6388 | 565 | return (bufstream_getc (buffers[bash_input.location.buffered_fd])); |
28ef6c31 JA |
566 | #else |
567 | /* On DJGPP, ignore \r. */ | |
568 | int ch; | |
569 | while ((ch = bufstream_getc (buffers[bash_input.location.buffered_fd])) == '\r') | |
570 | ; | |
571 | return ch; | |
572 | #endif | |
726f6388 JA |
573 | } |
574 | ||
575 | int | |
576 | buffered_ungetchar (c) | |
577 | int c; | |
578 | { | |
579 | return (bufstream_ungetc (c, buffers[bash_input.location.buffered_fd])); | |
580 | } | |
581 | ||
582 | /* Make input come from file descriptor BFD through a buffered stream. */ | |
583 | void | |
584 | with_input_from_buffered_stream (bfd, name) | |
585 | int bfd; | |
586 | char *name; | |
587 | { | |
588 | INPUT_STREAM location; | |
ccc6cda3 | 589 | BUFFERED_STREAM *bp; |
726f6388 JA |
590 | |
591 | location.buffered_fd = bfd; | |
592 | /* Make sure the buffered stream exists. */ | |
ccc6cda3 JA |
593 | bp = fd_to_buffered_stream (bfd); |
594 | init_yy_io (bp == 0 ? return_EOF : buffered_getchar, | |
595 | buffered_ungetchar, st_bstream, name, location); | |
726f6388 JA |
596 | } |
597 | ||
598 | #if defined (TEST) | |
f73dda09 | 599 | void * |
726f6388 JA |
600 | xmalloc(s) |
601 | int s; | |
602 | { | |
f73dda09 | 603 | return (malloc (s)); |
726f6388 JA |
604 | } |
605 | ||
f73dda09 | 606 | void * |
726f6388 JA |
607 | xrealloc(s, size) |
608 | char *s; | |
609 | int size; | |
610 | { | |
611 | if (!s) | |
f73dda09 | 612 | return(malloc (size)); |
726f6388 | 613 | else |
f73dda09 | 614 | return(realloc (s, size)); |
726f6388 JA |
615 | } |
616 | ||
617 | void | |
618 | init_yy_io () | |
619 | { | |
620 | } | |
621 | ||
622 | process(bp) | |
623 | BUFFERED_STREAM *bp; | |
624 | { | |
625 | int c; | |
626 | ||
627 | while ((c = bufstream_getc(bp)) != EOF) | |
628 | putchar(c); | |
629 | } | |
630 | ||
631 | BASH_INPUT bash_input; | |
632 | ||
633 | struct stat dsb; /* can be used from gdb */ | |
634 | ||
635 | /* imitate /bin/cat */ | |
636 | main(argc, argv) | |
637 | int argc; | |
638 | char **argv; | |
639 | { | |
640 | register int i; | |
641 | BUFFERED_STREAM *bp; | |
642 | ||
643 | if (argc == 1) { | |
644 | bp = fd_to_buffered_stream (0); | |
645 | process(bp); | |
646 | exit(0); | |
647 | } | |
648 | for (i = 1; i < argc; i++) { | |
649 | if (argv[i][0] == '-' && argv[i][1] == '\0') { | |
650 | bp = fd_to_buffered_stream (0); | |
651 | if (!bp) | |
652 | continue; | |
653 | process(bp); | |
654 | free_buffered_stream (bp); | |
655 | } else { | |
656 | bp = open_buffered_stream (argv[i]); | |
657 | if (!bp) | |
658 | continue; | |
659 | process(bp); | |
660 | close_buffered_stream (bp); | |
661 | } | |
662 | } | |
663 | exit(0); | |
664 | } | |
ccc6cda3 JA |
665 | #endif /* TEST */ |
666 | #endif /* BUFFERED_INPUT */ |