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Commit | Line | Data |
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726f6388 JA |
1 | /* input.c -- functions to perform buffered input with synchronization. */ |
2 | ||
012bac39 | 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 | ||
2e4498b3 CR |
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 | |
2e4498b3 CR |
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 | |
2e4498b3 CR |
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" | |
d3a24ed2 | 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" |
5e13499c CR |
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" | |
ac18b312 | 44 | #include "quit.h" |
726f6388 JA |
45 | |
46 | #if !defined (errno) | |
47 | extern int errno; | |
48 | #endif /* !errno */ | |
49 | ||
09767ff0 CR |
50 | #if defined (EAGAIN) |
51 | # define X_EAGAIN EAGAIN | |
52 | #else | |
53 | # define X_EAGAIN -99 | |
54 | #endif | |
55 | ||
56 | #if defined (EWOULDBLOCK) | |
57 | # define X_EWOULDBLOCK EWOULDBLOCK | |
58 | #else | |
59 | # define X_EWOULDBLOCK -99 | |
60 | #endif | |
61 | ||
d3ad40de CR |
62 | extern void termsig_handler __P((int)); |
63 | ||
ccc6cda3 JA |
64 | /* Functions to handle reading input on systems that don't restart read(2) |
65 | if a signal is received. */ | |
66 | ||
f73dda09 | 67 | static char localbuf[128]; |
01ed5ba4 | 68 | static int local_index = 0, local_bufused = 0; |
ccc6cda3 JA |
69 | |
70 | /* Posix and USG systems do not guarantee to restart read () if it is | |
71 | interrupted by a signal. We do the read ourselves, and restart it | |
72 | if it returns EINTR. */ | |
73 | int | |
74 | getc_with_restart (stream) | |
75 | FILE *stream; | |
76 | { | |
f73dda09 JA |
77 | unsigned char uc; |
78 | ||
ac18b312 CR |
79 | CHECK_TERMSIG; |
80 | ||
ccc6cda3 JA |
81 | /* Try local buffering to reduce the number of read(2) calls. */ |
82 | if (local_index == local_bufused || local_bufused == 0) | |
83 | { | |
84 | while (1) | |
85 | { | |
36eb585c | 86 | QUIT; |
55a5a4ac CR |
87 | run_pending_traps (); |
88 | ||
ccc6cda3 JA |
89 | local_bufused = read (fileno (stream), localbuf, sizeof(localbuf)); |
90 | if (local_bufused > 0) | |
91 | break; | |
d9e1f41e CR |
92 | else if (local_bufused == 0) |
93 | { | |
94 | local_index = 0; | |
95 | return EOF; | |
96 | } | |
09767ff0 CR |
97 | else if (errno == X_EAGAIN || errno == X_EWOULDBLOCK) |
98 | { | |
99 | if (sh_unset_nodelay_mode (fileno (stream)) < 0) | |
100 | { | |
101 | sys_error (_("cannot reset nodelay mode for fd %d"), fileno (stream)); | |
102 | return EOF; | |
103 | } | |
104 | continue; | |
105 | } | |
d9e1f41e | 106 | else if (errno != EINTR) |
ccc6cda3 JA |
107 | { |
108 | local_index = 0; | |
109 | return EOF; | |
110 | } | |
111 | } | |
112 | local_index = 0; | |
113 | } | |
f73dda09 JA |
114 | uc = localbuf[local_index++]; |
115 | return uc; | |
ccc6cda3 JA |
116 | } |
117 | ||
118 | int | |
119 | ungetc_with_restart (c, stream) | |
120 | int c; | |
121 | FILE *stream; | |
122 | { | |
123 | if (local_index == 0 || c == EOF) | |
124 | return EOF; | |
f73dda09 JA |
125 | localbuf[--local_index] = c; |
126 | return c; | |
ccc6cda3 | 127 | } |
ccc6cda3 JA |
128 | |
129 | #if defined (BUFFERED_INPUT) | |
130 | ||
131 | /* A facility similar to stdio, but input-only. */ | |
132 | ||
bb70624e JA |
133 | #if defined (USING_BASH_MALLOC) |
134 | # define MAX_INPUT_BUFFER_SIZE 8176 | |
135 | #else | |
136 | # define MAX_INPUT_BUFFER_SIZE 8192 | |
137 | #endif | |
726f6388 JA |
138 | |
139 | #if !defined (SEEK_CUR) | |
140 | # define SEEK_CUR 1 | |
141 | #endif /* !SEEK_CUR */ | |
142 | ||
28ef6c31 JA |
143 | #ifdef max |
144 | # undef max | |
145 | #endif | |
146 | #define max(a, b) (((a) > (b)) ? (a) : (b)) | |
147 | #ifdef min | |
148 | # undef min | |
149 | #endif | |
150 | #define min(a, b) ((a) > (b) ? (b) : (a)) | |
151 | ||
726f6388 JA |
152 | extern int interactive_shell; |
153 | ||
154 | int bash_input_fd_changed; | |
ccc6cda3 | 155 | |
726f6388 JA |
156 | /* This provides a way to map from a file descriptor to the buffer |
157 | associated with that file descriptor, rather than just the other | |
158 | way around. This is needed so that buffers are managed properly | |
159 | in constructs like 3<&4. buffers[x]->b_fd == x -- that is how the | |
160 | correspondence is maintained. */ | |
cce855bc | 161 | static BUFFERED_STREAM **buffers = (BUFFERED_STREAM **)NULL; |
ccc6cda3 | 162 | static int nbuffers; |
726f6388 | 163 | |
726f6388 JA |
164 | #define ALLOCATE_BUFFERS(n) \ |
165 | do { if ((n) >= nbuffers) allocate_buffers (n); } while (0) | |
166 | ||
167 | /* Make sure `buffers' has at least N elements. */ | |
168 | static void | |
169 | allocate_buffers (n) | |
170 | int n; | |
171 | { | |
172 | register int i, orig_nbuffers; | |
173 | ||
174 | orig_nbuffers = nbuffers; | |
175 | nbuffers = n + 20; | |
176 | buffers = (BUFFERED_STREAM **)xrealloc | |
177 | (buffers, nbuffers * sizeof (BUFFERED_STREAM *)); | |
178 | ||
179 | /* Zero out the new buffers. */ | |
180 | for (i = orig_nbuffers; i < nbuffers; i++) | |
181 | buffers[i] = (BUFFERED_STREAM *)NULL; | |
182 | } | |
183 | ||
184 | /* Construct and return a BUFFERED_STREAM corresponding to file descriptor | |
185 | FD, using BUFFER. */ | |
186 | static BUFFERED_STREAM * | |
187 | make_buffered_stream (fd, buffer, bufsize) | |
188 | int fd; | |
189 | char *buffer; | |
cce855bc | 190 | size_t bufsize; |
726f6388 JA |
191 | { |
192 | BUFFERED_STREAM *bp; | |
193 | ||
194 | bp = (BUFFERED_STREAM *)xmalloc (sizeof (BUFFERED_STREAM)); | |
195 | ALLOCATE_BUFFERS (fd); | |
196 | buffers[fd] = bp; | |
197 | bp->b_fd = fd; | |
198 | bp->b_buffer = buffer; | |
199 | bp->b_size = bufsize; | |
ccc6cda3 | 200 | bp->b_used = bp->b_inputp = bp->b_flag = 0; |
726f6388 JA |
201 | if (bufsize == 1) |
202 | bp->b_flag |= B_UNBUFF; | |
54a1fa7c CR |
203 | if (O_TEXT && (fcntl (fd, F_GETFL) & O_TEXT) != 0) |
204 | bp->b_flag |= O_TEXT; | |
726f6388 JA |
205 | return (bp); |
206 | } | |
207 | ||
208 | /* Allocate a new BUFFERED_STREAM, copy BP to it, and return the new copy. */ | |
209 | static BUFFERED_STREAM * | |
210 | copy_buffered_stream (bp) | |
211 | BUFFERED_STREAM *bp; | |
212 | { | |
213 | BUFFERED_STREAM *nbp; | |
214 | ||
215 | if (!bp) | |
216 | return ((BUFFERED_STREAM *)NULL); | |
217 | ||
218 | nbp = (BUFFERED_STREAM *)xmalloc (sizeof (BUFFERED_STREAM)); | |
219 | xbcopy ((char *)bp, (char *)nbp, sizeof (BUFFERED_STREAM)); | |
220 | return (nbp); | |
221 | } | |
222 | ||
28ef6c31 JA |
223 | int |
224 | set_bash_input_fd (fd) | |
225 | int fd; | |
226 | { | |
227 | if (bash_input.type == st_bstream) | |
228 | bash_input.location.buffered_fd = fd; | |
229 | else if (interactive_shell == 0) | |
230 | default_buffered_input = fd; | |
231 | return 0; | |
232 | } | |
233 | ||
234 | int | |
235 | fd_is_bash_input (fd) | |
236 | int fd; | |
237 | { | |
238 | if (bash_input.type == st_bstream && bash_input.location.buffered_fd == fd) | |
239 | return 1; | |
240 | else if (interactive_shell == 0 && default_buffered_input == fd) | |
241 | return 1; | |
242 | return 0; | |
243 | } | |
244 | ||
245 | /* Save the buffered stream corresponding to file descriptor FD (which bash | |
246 | is using to read input) to a buffered stream associated with NEW_FD. If | |
247 | NEW_FD is -1, a new file descriptor is allocated with fcntl. The new | |
248 | file descriptor is returned on success, -1 on error. */ | |
249 | int | |
250 | save_bash_input (fd, new_fd) | |
251 | int fd, new_fd; | |
252 | { | |
253 | int nfd; | |
254 | ||
255 | /* Sync the stream so we can re-read from the new file descriptor. We | |
256 | might be able to avoid this by copying the buffered stream verbatim | |
257 | to the new file descriptor. */ | |
258 | if (buffers[fd]) | |
259 | sync_buffered_stream (fd); | |
260 | ||
261 | /* Now take care of duplicating the file descriptor that bash is | |
262 | using for input, so we can reinitialize it later. */ | |
263 | nfd = (new_fd == -1) ? fcntl (fd, F_DUPFD, 10) : new_fd; | |
264 | if (nfd == -1) | |
265 | { | |
266 | if (fcntl (fd, F_GETFD, 0) == 0) | |
5e13499c | 267 | sys_error (_("cannot allocate new file descriptor for bash input from fd %d"), fd); |
28ef6c31 JA |
268 | return -1; |
269 | } | |
270 | ||
271 | if (buffers[nfd]) | |
272 | { | |
273 | /* What's this? A stray buffer without an associated open file | |
274 | descriptor? Free up the buffer and report the error. */ | |
5e13499c | 275 | internal_error (_("save_bash_input: buffer already exists for new fd %d"), nfd); |
28ef6c31 JA |
276 | free_buffered_stream (buffers[nfd]); |
277 | } | |
278 | ||
279 | /* Reinitialize bash_input.location. */ | |
280 | if (bash_input.type == st_bstream) | |
281 | { | |
282 | bash_input.location.buffered_fd = nfd; | |
283 | fd_to_buffered_stream (nfd); | |
284 | close_buffered_fd (fd); /* XXX */ | |
285 | } | |
286 | else | |
287 | /* If the current input type is not a buffered stream, but the shell | |
288 | is not interactive and therefore using a buffered stream to read | |
289 | input (e.g. with an `eval exec 3>output' inside a script), note | |
290 | that the input fd has been changed. pop_stream() looks at this | |
291 | value and adjusts the input fd to the new value of | |
292 | default_buffered_input accordingly. */ | |
293 | bash_input_fd_changed++; | |
294 | ||
295 | if (default_buffered_input == fd) | |
296 | default_buffered_input = nfd; | |
297 | ||
298 | SET_CLOSE_ON_EXEC (nfd); | |
299 | return nfd; | |
300 | } | |
301 | ||
726f6388 JA |
302 | /* Check that file descriptor FD is not the one that bash is currently |
303 | using to read input from a script. FD is about to be duplicated onto, | |
304 | which means that the kernel will close it for us. If FD is the bash | |
305 | input file descriptor, we need to seek backwards in the script (if | |
306 | possible and necessary -- scripts read from stdin are still unbuffered), | |
307 | allocate a new file descriptor to use for bash input, and re-initialize | |
28ef6c31 JA |
308 | the buffered stream. Make sure the file descriptor used to save bash |
309 | input is set close-on-exec. Returns 0 on success, -1 on failure. This | |
310 | works only if fd is > 0 -- if fd == 0 and bash is reading input from | |
311 | fd 0, save_bash_input is used instead, to cooperate with input | |
312 | redirection (look at redir.c:add_undo_redirect()). */ | |
726f6388 JA |
313 | int |
314 | check_bash_input (fd) | |
315 | int fd; | |
316 | { | |
d3a24ed2 CR |
317 | if (fd_is_bash_input (fd)) |
318 | { | |
319 | if (fd > 0) | |
320 | return ((save_bash_input (fd, -1) == -1) ? -1 : 0); | |
321 | else if (fd == 0) | |
322 | return ((sync_buffered_stream (fd) == -1) ? -1 : 0); | |
323 | } | |
726f6388 JA |
324 | return 0; |
325 | } | |
326 | ||
327 | /* This is the buffered stream analogue of dup2(fd1, fd2). The | |
328 | BUFFERED_STREAM corresponding to fd2 is deallocated, if one exists. | |
329 | BUFFERS[fd1] is copied to BUFFERS[fd2]. This is called by the | |
330 | redirect code for constructs like 4<&0 and 3</etc/rc.local. */ | |
ccc6cda3 | 331 | int |
726f6388 JA |
332 | duplicate_buffered_stream (fd1, fd2) |
333 | int fd1, fd2; | |
334 | { | |
335 | int is_bash_input, m; | |
336 | ||
337 | if (fd1 == fd2) | |
338 | return 0; | |
339 | ||
340 | m = max (fd1, fd2); | |
341 | ALLOCATE_BUFFERS (m); | |
342 | ||
343 | /* If FD2 is the file descriptor bash is currently using for shell input, | |
344 | we need to do some extra work to make sure that the buffered stream | |
345 | actually exists (it might not if fd1 was not active, and the copy | |
346 | didn't actually do anything). */ | |
347 | is_bash_input = (bash_input.type == st_bstream) && | |
348 | (bash_input.location.buffered_fd == fd2); | |
349 | ||
350 | if (buffers[fd2]) | |
fd3925f1 CR |
351 | { |
352 | /* If the two objects share the same b_buffer, don't free it. */ | |
353 | if (buffers[fd1] && buffers[fd1]->b_buffer && buffers[fd1]->b_buffer == buffers[fd2]->b_buffer) | |
354 | buffers[fd2] = (BUFFERED_STREAM *)NULL; | |
355 | else | |
356 | free_buffered_stream (buffers[fd2]); | |
357 | } | |
726f6388 JA |
358 | buffers[fd2] = copy_buffered_stream (buffers[fd1]); |
359 | if (buffers[fd2]) | |
360 | buffers[fd2]->b_fd = fd2; | |
361 | ||
28ef6c31 JA |
362 | if (is_bash_input) |
363 | { | |
364 | if (!buffers[fd2]) | |
365 | fd_to_buffered_stream (fd2); | |
366 | buffers[fd2]->b_flag |= B_WASBASHINPUT; | |
367 | } | |
ccc6cda3 | 368 | |
726f6388 JA |
369 | return (fd2); |
370 | } | |
371 | ||
372 | /* Return 1 if a seek on FD will succeed. */ | |
54a1fa7c | 373 | #define fd_is_seekable(fd) (lseek ((fd), 0L, SEEK_CUR) >= 0) |
726f6388 JA |
374 | |
375 | /* Take FD, a file descriptor, and create and return a buffered stream | |
376 | corresponding to it. If something is wrong and the file descriptor | |
377 | is invalid, return a NULL stream. */ | |
378 | BUFFERED_STREAM * | |
379 | fd_to_buffered_stream (fd) | |
380 | int fd; | |
381 | { | |
382 | char *buffer; | |
cce855bc | 383 | size_t size; |
726f6388 JA |
384 | struct stat sb; |
385 | ||
386 | if (fstat (fd, &sb) < 0) | |
387 | { | |
388 | close (fd); | |
389 | return ((BUFFERED_STREAM *)NULL); | |
390 | } | |
391 | ||
28ef6c31 JA |
392 | size = (fd_is_seekable (fd)) ? min (sb.st_size, MAX_INPUT_BUFFER_SIZE) : 1; |
393 | if (size == 0) | |
726f6388 | 394 | size = 1; |
726f6388 JA |
395 | buffer = (char *)xmalloc (size); |
396 | ||
397 | return (make_buffered_stream (fd, buffer, size)); | |
398 | } | |
399 | ||
400 | /* Return a buffered stream corresponding to FILE, a file name. */ | |
401 | BUFFERED_STREAM * | |
402 | open_buffered_stream (file) | |
403 | char *file; | |
404 | { | |
405 | int fd; | |
406 | ||
407 | fd = open (file, O_RDONLY); | |
ccc6cda3 | 408 | return ((fd >= 0) ? fd_to_buffered_stream (fd) : (BUFFERED_STREAM *)NULL); |
726f6388 JA |
409 | } |
410 | ||
411 | /* Deallocate a buffered stream and free up its resources. Make sure we | |
412 | zero out the slot in BUFFERS that points to BP. */ | |
413 | void | |
414 | free_buffered_stream (bp) | |
415 | BUFFERED_STREAM *bp; | |
416 | { | |
417 | int n; | |
418 | ||
419 | if (!bp) | |
420 | return; | |
421 | ||
422 | n = bp->b_fd; | |
423 | if (bp->b_buffer) | |
424 | free (bp->b_buffer); | |
425 | free (bp); | |
426 | buffers[n] = (BUFFERED_STREAM *)NULL; | |
427 | } | |
428 | ||
429 | /* Close the file descriptor associated with BP, a buffered stream, and free | |
430 | up the stream. Return the status of closing BP's file descriptor. */ | |
431 | int | |
432 | close_buffered_stream (bp) | |
433 | BUFFERED_STREAM *bp; | |
434 | { | |
435 | int fd; | |
436 | ||
437 | if (!bp) | |
438 | return (0); | |
439 | fd = bp->b_fd; | |
440 | free_buffered_stream (bp); | |
441 | return (close (fd)); | |
442 | } | |
443 | ||
444 | /* Deallocate the buffered stream associated with file descriptor FD, and | |
445 | close FD. Return the status of the close on FD. */ | |
446 | int | |
447 | close_buffered_fd (fd) | |
448 | int fd; | |
449 | { | |
f73dda09 JA |
450 | if (fd < 0) |
451 | { | |
452 | errno = EBADF; | |
453 | return -1; | |
454 | } | |
726f6388 JA |
455 | if (fd >= nbuffers || !buffers || !buffers[fd]) |
456 | return (close (fd)); | |
457 | return (close_buffered_stream (buffers[fd])); | |
458 | } | |
459 | ||
cce855bc JA |
460 | /* Make the BUFFERED_STREAM associcated with buffers[FD] be BP, and return |
461 | the old BUFFERED_STREAM. */ | |
462 | BUFFERED_STREAM * | |
463 | set_buffered_stream (fd, bp) | |
464 | int fd; | |
465 | BUFFERED_STREAM *bp; | |
466 | { | |
467 | BUFFERED_STREAM *ret; | |
468 | ||
469 | ret = buffers[fd]; | |
470 | buffers[fd] = bp; | |
471 | return ret; | |
472 | } | |
473 | ||
726f6388 JA |
474 | /* Read a buffer full of characters from BP, a buffered stream. */ |
475 | static int | |
476 | b_fill_buffer (bp) | |
477 | BUFFERED_STREAM *bp; | |
478 | { | |
f73dda09 | 479 | ssize_t nr; |
54a1fa7c | 480 | off_t o; |
f73dda09 | 481 | |
ac18b312 | 482 | CHECK_TERMSIG; |
54a1fa7c CR |
483 | /* In an environment where text and binary files are treated differently, |
484 | compensate for lseek() on text files returning an offset different from | |
485 | the count of characters read() returns. Text-mode streams have to be | |
486 | treated as unbuffered. */ | |
487 | if ((bp->b_flag & (B_TEXT | B_UNBUFF)) == B_TEXT) | |
488 | { | |
489 | o = lseek (bp->b_fd, 0, SEEK_CUR); | |
490 | nr = zread (bp->b_fd, bp->b_buffer, bp->b_size); | |
491 | if (nr > 0 && nr < lseek (bp->b_fd, 0, SEEK_CUR) - o) | |
492 | { | |
493 | lseek (bp->b_fd, o, SEEK_SET); | |
494 | bp->b_flag |= B_UNBUFF; | |
495 | bp->b_size = 1; | |
496 | nr = zread (bp->b_fd, bp->b_buffer, bp->b_size); | |
497 | } | |
498 | } | |
499 | else | |
500 | nr = zread (bp->b_fd, bp->b_buffer, bp->b_size); | |
f73dda09 | 501 | if (nr <= 0) |
726f6388 | 502 | { |
f73dda09 | 503 | bp->b_used = 0; |
726f6388 | 504 | bp->b_buffer[0] = 0; |
f73dda09 | 505 | if (nr == 0) |
726f6388 JA |
506 | bp->b_flag |= B_EOF; |
507 | else | |
508 | bp->b_flag |= B_ERROR; | |
509 | return (EOF); | |
510 | } | |
f73dda09 | 511 | |
f73dda09 | 512 | bp->b_used = nr; |
726f6388 JA |
513 | bp->b_inputp = 0; |
514 | return (bp->b_buffer[bp->b_inputp++] & 0xFF); | |
515 | } | |
516 | ||
517 | /* Get a character from buffered stream BP. */ | |
518 | #define bufstream_getc(bp) \ | |
519 | (bp->b_inputp == bp->b_used || !bp->b_used) \ | |
520 | ? b_fill_buffer (bp) \ | |
521 | : bp->b_buffer[bp->b_inputp++] & 0xFF | |
522 | ||
523 | /* Push C back onto buffered stream BP. */ | |
524 | static int | |
525 | bufstream_ungetc(c, bp) | |
526 | int c; | |
527 | BUFFERED_STREAM *bp; | |
528 | { | |
529 | if (c == EOF || bp->b_inputp == 0) | |
530 | return (EOF); | |
531 | ||
532 | bp->b_buffer[--bp->b_inputp] = c; | |
533 | return (c); | |
534 | } | |
535 | ||
536 | /* Seek backwards on file BFD to synchronize what we've read so far | |
537 | with the underlying file pointer. */ | |
538 | int | |
539 | sync_buffered_stream (bfd) | |
540 | int bfd; | |
541 | { | |
542 | BUFFERED_STREAM *bp; | |
ccc6cda3 | 543 | off_t chars_left; |
726f6388 | 544 | |
28ef6c31 | 545 | if (buffers == 0 || (bp = buffers[bfd]) == 0) |
726f6388 | 546 | return (-1); |
28ef6c31 | 547 | |
726f6388 JA |
548 | chars_left = bp->b_used - bp->b_inputp; |
549 | if (chars_left) | |
550 | lseek (bp->b_fd, -chars_left, SEEK_CUR); | |
551 | bp->b_used = bp->b_inputp = 0; | |
552 | return (0); | |
553 | } | |
554 | ||
555 | int | |
556 | buffered_getchar () | |
557 | { | |
ac18b312 CR |
558 | CHECK_TERMSIG; |
559 | ||
28ef6c31 | 560 | #if !defined (DJGPP) |
726f6388 | 561 | return (bufstream_getc (buffers[bash_input.location.buffered_fd])); |
28ef6c31 JA |
562 | #else |
563 | /* On DJGPP, ignore \r. */ | |
564 | int ch; | |
565 | while ((ch = bufstream_getc (buffers[bash_input.location.buffered_fd])) == '\r') | |
566 | ; | |
567 | return ch; | |
568 | #endif | |
726f6388 JA |
569 | } |
570 | ||
571 | int | |
572 | buffered_ungetchar (c) | |
573 | int c; | |
574 | { | |
575 | return (bufstream_ungetc (c, buffers[bash_input.location.buffered_fd])); | |
576 | } | |
577 | ||
578 | /* Make input come from file descriptor BFD through a buffered stream. */ | |
579 | void | |
580 | with_input_from_buffered_stream (bfd, name) | |
581 | int bfd; | |
582 | char *name; | |
583 | { | |
584 | INPUT_STREAM location; | |
ccc6cda3 | 585 | BUFFERED_STREAM *bp; |
726f6388 JA |
586 | |
587 | location.buffered_fd = bfd; | |
588 | /* Make sure the buffered stream exists. */ | |
ccc6cda3 JA |
589 | bp = fd_to_buffered_stream (bfd); |
590 | init_yy_io (bp == 0 ? return_EOF : buffered_getchar, | |
591 | buffered_ungetchar, st_bstream, name, location); | |
726f6388 JA |
592 | } |
593 | ||
594 | #if defined (TEST) | |
f73dda09 | 595 | void * |
726f6388 JA |
596 | xmalloc(s) |
597 | int s; | |
598 | { | |
f73dda09 | 599 | return (malloc (s)); |
726f6388 JA |
600 | } |
601 | ||
f73dda09 | 602 | void * |
726f6388 JA |
603 | xrealloc(s, size) |
604 | char *s; | |
605 | int size; | |
606 | { | |
607 | if (!s) | |
f73dda09 | 608 | return(malloc (size)); |
726f6388 | 609 | else |
f73dda09 | 610 | return(realloc (s, size)); |
726f6388 JA |
611 | } |
612 | ||
613 | void | |
614 | init_yy_io () | |
615 | { | |
616 | } | |
617 | ||
618 | process(bp) | |
619 | BUFFERED_STREAM *bp; | |
620 | { | |
621 | int c; | |
622 | ||
623 | while ((c = bufstream_getc(bp)) != EOF) | |
624 | putchar(c); | |
625 | } | |
626 | ||
627 | BASH_INPUT bash_input; | |
628 | ||
629 | struct stat dsb; /* can be used from gdb */ | |
630 | ||
631 | /* imitate /bin/cat */ | |
632 | main(argc, argv) | |
633 | int argc; | |
634 | char **argv; | |
635 | { | |
636 | register int i; | |
637 | BUFFERED_STREAM *bp; | |
638 | ||
639 | if (argc == 1) { | |
640 | bp = fd_to_buffered_stream (0); | |
641 | process(bp); | |
642 | exit(0); | |
643 | } | |
644 | for (i = 1; i < argc; i++) { | |
645 | if (argv[i][0] == '-' && argv[i][1] == '\0') { | |
646 | bp = fd_to_buffered_stream (0); | |
647 | if (!bp) | |
648 | continue; | |
649 | process(bp); | |
650 | free_buffered_stream (bp); | |
651 | } else { | |
652 | bp = open_buffered_stream (argv[i]); | |
653 | if (!bp) | |
654 | continue; | |
655 | process(bp); | |
656 | close_buffered_stream (bp); | |
657 | } | |
658 | } | |
659 | exit(0); | |
660 | } | |
ccc6cda3 JA |
661 | #endif /* TEST */ |
662 | #endif /* BUFFERED_INPUT */ |