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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" |
d76edd30 | 45 | #include "trap.h" |
726f6388 JA |
46 | |
47 | #if !defined (errno) | |
48 | extern int errno; | |
49 | #endif /* !errno */ | |
50 | ||
09767ff0 CR |
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 | ||
d3ad40de CR |
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]; |
01ed5ba4 | 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 | ||
ac18b312 CR |
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 | { | |
36eb585c | 87 | QUIT; |
55a5a4ac CR |
88 | run_pending_traps (); |
89 | ||
ccc6cda3 JA |
90 | local_bufused = read (fileno (stream), localbuf, sizeof(localbuf)); |
91 | if (local_bufused > 0) | |
92 | break; | |
d9e1f41e CR |
93 | else if (local_bufused == 0) |
94 | { | |
95 | local_index = 0; | |
96 | return EOF; | |
97 | } | |
09767ff0 CR |
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)); | |
d76edd30 | 103 | local_index = local_bufused = 0; |
09767ff0 CR |
104 | return EOF; |
105 | } | |
106 | continue; | |
107 | } | |
d9e1f41e | 108 | else if (errno != EINTR) |
ccc6cda3 | 109 | { |
d76edd30 | 110 | local_index = local_bufused = 0; |
ccc6cda3 JA |
111 | return EOF; |
112 | } | |
113 | } | |
114 | local_index = 0; | |
115 | } | |
f73dda09 JA |
116 | uc = localbuf[local_index++]; |
117 | return uc; | |
ccc6cda3 JA |
118 | } |
119 | ||
120 | int | |
121 | ungetc_with_restart (c, stream) | |
122 | int c; | |
123 | FILE *stream; | |
124 | { | |
125 | if (local_index == 0 || c == EOF) | |
126 | return EOF; | |
f73dda09 JA |
127 | localbuf[--local_index] = c; |
128 | return c; | |
ccc6cda3 | 129 | } |
ccc6cda3 JA |
130 | |
131 | #if defined (BUFFERED_INPUT) | |
132 | ||
133 | /* A facility similar to stdio, but input-only. */ | |
134 | ||
bb70624e JA |
135 | #if defined (USING_BASH_MALLOC) |
136 | # define MAX_INPUT_BUFFER_SIZE 8176 | |
137 | #else | |
138 | # define MAX_INPUT_BUFFER_SIZE 8192 | |
139 | #endif | |
726f6388 JA |
140 | |
141 | #if !defined (SEEK_CUR) | |
142 | # define SEEK_CUR 1 | |
143 | #endif /* !SEEK_CUR */ | |
144 | ||
28ef6c31 JA |
145 | #ifdef max |
146 | # undef max | |
147 | #endif | |
148 | #define max(a, b) (((a) > (b)) ? (a) : (b)) | |
149 | #ifdef min | |
150 | # undef min | |
151 | #endif | |
152 | #define min(a, b) ((a) > (b) ? (b) : (a)) | |
153 | ||
726f6388 JA |
154 | extern int interactive_shell; |
155 | ||
156 | int bash_input_fd_changed; | |
ccc6cda3 | 157 | |
726f6388 JA |
158 | /* This provides a way to map from a file descriptor to the buffer |
159 | associated with that file descriptor, rather than just the other | |
160 | way around. This is needed so that buffers are managed properly | |
161 | in constructs like 3<&4. buffers[x]->b_fd == x -- that is how the | |
162 | correspondence is maintained. */ | |
cce855bc | 163 | static BUFFERED_STREAM **buffers = (BUFFERED_STREAM **)NULL; |
ccc6cda3 | 164 | static int nbuffers; |
726f6388 | 165 | |
726f6388 JA |
166 | #define ALLOCATE_BUFFERS(n) \ |
167 | do { if ((n) >= nbuffers) allocate_buffers (n); } while (0) | |
168 | ||
169 | /* Make sure `buffers' has at least N elements. */ | |
170 | static void | |
171 | allocate_buffers (n) | |
172 | int n; | |
173 | { | |
174 | register int i, orig_nbuffers; | |
175 | ||
176 | orig_nbuffers = nbuffers; | |
177 | nbuffers = n + 20; | |
178 | buffers = (BUFFERED_STREAM **)xrealloc | |
179 | (buffers, nbuffers * sizeof (BUFFERED_STREAM *)); | |
180 | ||
181 | /* Zero out the new buffers. */ | |
182 | for (i = orig_nbuffers; i < nbuffers; i++) | |
183 | buffers[i] = (BUFFERED_STREAM *)NULL; | |
184 | } | |
185 | ||
186 | /* Construct and return a BUFFERED_STREAM corresponding to file descriptor | |
187 | FD, using BUFFER. */ | |
188 | static BUFFERED_STREAM * | |
189 | make_buffered_stream (fd, buffer, bufsize) | |
190 | int fd; | |
191 | char *buffer; | |
cce855bc | 192 | size_t bufsize; |
726f6388 JA |
193 | { |
194 | BUFFERED_STREAM *bp; | |
195 | ||
196 | bp = (BUFFERED_STREAM *)xmalloc (sizeof (BUFFERED_STREAM)); | |
197 | ALLOCATE_BUFFERS (fd); | |
198 | buffers[fd] = bp; | |
199 | bp->b_fd = fd; | |
200 | bp->b_buffer = buffer; | |
201 | bp->b_size = bufsize; | |
ccc6cda3 | 202 | bp->b_used = bp->b_inputp = bp->b_flag = 0; |
726f6388 JA |
203 | if (bufsize == 1) |
204 | bp->b_flag |= B_UNBUFF; | |
54a1fa7c CR |
205 | if (O_TEXT && (fcntl (fd, F_GETFL) & O_TEXT) != 0) |
206 | bp->b_flag |= O_TEXT; | |
726f6388 JA |
207 | return (bp); |
208 | } | |
209 | ||
210 | /* Allocate a new BUFFERED_STREAM, copy BP to it, and return the new copy. */ | |
211 | static BUFFERED_STREAM * | |
212 | copy_buffered_stream (bp) | |
213 | BUFFERED_STREAM *bp; | |
214 | { | |
215 | BUFFERED_STREAM *nbp; | |
216 | ||
217 | if (!bp) | |
218 | return ((BUFFERED_STREAM *)NULL); | |
219 | ||
220 | nbp = (BUFFERED_STREAM *)xmalloc (sizeof (BUFFERED_STREAM)); | |
221 | xbcopy ((char *)bp, (char *)nbp, sizeof (BUFFERED_STREAM)); | |
222 | return (nbp); | |
223 | } | |
224 | ||
28ef6c31 JA |
225 | int |
226 | set_bash_input_fd (fd) | |
227 | int fd; | |
228 | { | |
229 | if (bash_input.type == st_bstream) | |
230 | bash_input.location.buffered_fd = fd; | |
231 | else if (interactive_shell == 0) | |
232 | default_buffered_input = fd; | |
233 | return 0; | |
234 | } | |
235 | ||
236 | int | |
237 | fd_is_bash_input (fd) | |
238 | int fd; | |
239 | { | |
240 | if (bash_input.type == st_bstream && bash_input.location.buffered_fd == fd) | |
241 | return 1; | |
242 | else if (interactive_shell == 0 && default_buffered_input == fd) | |
243 | return 1; | |
244 | return 0; | |
245 | } | |
246 | ||
247 | /* Save the buffered stream corresponding to file descriptor FD (which bash | |
248 | is using to read input) to a buffered stream associated with NEW_FD. If | |
249 | NEW_FD is -1, a new file descriptor is allocated with fcntl. The new | |
250 | file descriptor is returned on success, -1 on error. */ | |
251 | int | |
252 | save_bash_input (fd, new_fd) | |
253 | int fd, new_fd; | |
254 | { | |
255 | int nfd; | |
256 | ||
257 | /* Sync the stream so we can re-read from the new file descriptor. We | |
258 | might be able to avoid this by copying the buffered stream verbatim | |
259 | to the new file descriptor. */ | |
260 | if (buffers[fd]) | |
261 | sync_buffered_stream (fd); | |
262 | ||
263 | /* Now take care of duplicating the file descriptor that bash is | |
264 | using for input, so we can reinitialize it later. */ | |
265 | nfd = (new_fd == -1) ? fcntl (fd, F_DUPFD, 10) : new_fd; | |
266 | if (nfd == -1) | |
267 | { | |
268 | if (fcntl (fd, F_GETFD, 0) == 0) | |
5e13499c | 269 | sys_error (_("cannot allocate new file descriptor for bash input from fd %d"), fd); |
28ef6c31 JA |
270 | return -1; |
271 | } | |
272 | ||
273 | if (buffers[nfd]) | |
274 | { | |
275 | /* What's this? A stray buffer without an associated open file | |
276 | descriptor? Free up the buffer and report the error. */ | |
5e13499c | 277 | internal_error (_("save_bash_input: buffer already exists for new fd %d"), nfd); |
28ef6c31 JA |
278 | free_buffered_stream (buffers[nfd]); |
279 | } | |
280 | ||
281 | /* Reinitialize bash_input.location. */ | |
282 | if (bash_input.type == st_bstream) | |
283 | { | |
284 | bash_input.location.buffered_fd = nfd; | |
285 | fd_to_buffered_stream (nfd); | |
286 | close_buffered_fd (fd); /* XXX */ | |
287 | } | |
288 | else | |
289 | /* If the current input type is not a buffered stream, but the shell | |
290 | is not interactive and therefore using a buffered stream to read | |
291 | input (e.g. with an `eval exec 3>output' inside a script), note | |
292 | that the input fd has been changed. pop_stream() looks at this | |
293 | value and adjusts the input fd to the new value of | |
294 | default_buffered_input accordingly. */ | |
295 | bash_input_fd_changed++; | |
296 | ||
297 | if (default_buffered_input == fd) | |
298 | default_buffered_input = nfd; | |
299 | ||
300 | SET_CLOSE_ON_EXEC (nfd); | |
301 | return nfd; | |
302 | } | |
303 | ||
726f6388 JA |
304 | /* Check that file descriptor FD is not the one that bash is currently |
305 | using to read input from a script. FD is about to be duplicated onto, | |
306 | which means that the kernel will close it for us. If FD is the bash | |
307 | input file descriptor, we need to seek backwards in the script (if | |
308 | possible and necessary -- scripts read from stdin are still unbuffered), | |
309 | allocate a new file descriptor to use for bash input, and re-initialize | |
28ef6c31 JA |
310 | the buffered stream. Make sure the file descriptor used to save bash |
311 | input is set close-on-exec. Returns 0 on success, -1 on failure. This | |
312 | works only if fd is > 0 -- if fd == 0 and bash is reading input from | |
fc34b3a4 | 313 | fd 0, sync_buffered_stream is used instead, to cooperate with input |
28ef6c31 | 314 | redirection (look at redir.c:add_undo_redirect()). */ |
726f6388 JA |
315 | int |
316 | check_bash_input (fd) | |
317 | int fd; | |
318 | { | |
d3a24ed2 CR |
319 | if (fd_is_bash_input (fd)) |
320 | { | |
321 | if (fd > 0) | |
322 | return ((save_bash_input (fd, -1) == -1) ? -1 : 0); | |
323 | else if (fd == 0) | |
324 | return ((sync_buffered_stream (fd) == -1) ? -1 : 0); | |
325 | } | |
726f6388 JA |
326 | return 0; |
327 | } | |
328 | ||
329 | /* This is the buffered stream analogue of dup2(fd1, fd2). The | |
330 | BUFFERED_STREAM corresponding to fd2 is deallocated, if one exists. | |
331 | BUFFERS[fd1] is copied to BUFFERS[fd2]. This is called by the | |
332 | redirect code for constructs like 4<&0 and 3</etc/rc.local. */ | |
ccc6cda3 | 333 | int |
726f6388 JA |
334 | duplicate_buffered_stream (fd1, fd2) |
335 | int fd1, fd2; | |
336 | { | |
337 | int is_bash_input, m; | |
338 | ||
339 | if (fd1 == fd2) | |
340 | return 0; | |
341 | ||
342 | m = max (fd1, fd2); | |
343 | ALLOCATE_BUFFERS (m); | |
344 | ||
345 | /* If FD2 is the file descriptor bash is currently using for shell input, | |
346 | we need to do some extra work to make sure that the buffered stream | |
347 | actually exists (it might not if fd1 was not active, and the copy | |
348 | didn't actually do anything). */ | |
349 | is_bash_input = (bash_input.type == st_bstream) && | |
350 | (bash_input.location.buffered_fd == fd2); | |
351 | ||
352 | if (buffers[fd2]) | |
fd3925f1 CR |
353 | { |
354 | /* If the two objects share the same b_buffer, don't free it. */ | |
355 | if (buffers[fd1] && buffers[fd1]->b_buffer && buffers[fd1]->b_buffer == buffers[fd2]->b_buffer) | |
356 | buffers[fd2] = (BUFFERED_STREAM *)NULL; | |
357 | else | |
358 | free_buffered_stream (buffers[fd2]); | |
359 | } | |
726f6388 JA |
360 | buffers[fd2] = copy_buffered_stream (buffers[fd1]); |
361 | if (buffers[fd2]) | |
362 | buffers[fd2]->b_fd = fd2; | |
363 | ||
28ef6c31 JA |
364 | if (is_bash_input) |
365 | { | |
366 | if (!buffers[fd2]) | |
367 | fd_to_buffered_stream (fd2); | |
368 | buffers[fd2]->b_flag |= B_WASBASHINPUT; | |
369 | } | |
ccc6cda3 | 370 | |
726f6388 JA |
371 | return (fd2); |
372 | } | |
373 | ||
374 | /* Return 1 if a seek on FD will succeed. */ | |
54a1fa7c | 375 | #define fd_is_seekable(fd) (lseek ((fd), 0L, SEEK_CUR) >= 0) |
726f6388 JA |
376 | |
377 | /* Take FD, a file descriptor, and create and return a buffered stream | |
378 | corresponding to it. If something is wrong and the file descriptor | |
379 | is invalid, return a NULL stream. */ | |
380 | BUFFERED_STREAM * | |
381 | fd_to_buffered_stream (fd) | |
382 | int fd; | |
383 | { | |
384 | char *buffer; | |
cce855bc | 385 | size_t size; |
726f6388 JA |
386 | struct stat sb; |
387 | ||
388 | if (fstat (fd, &sb) < 0) | |
389 | { | |
390 | close (fd); | |
391 | return ((BUFFERED_STREAM *)NULL); | |
392 | } | |
393 | ||
28ef6c31 JA |
394 | size = (fd_is_seekable (fd)) ? min (sb.st_size, MAX_INPUT_BUFFER_SIZE) : 1; |
395 | if (size == 0) | |
726f6388 | 396 | size = 1; |
726f6388 JA |
397 | buffer = (char *)xmalloc (size); |
398 | ||
399 | return (make_buffered_stream (fd, buffer, size)); | |
400 | } | |
401 | ||
402 | /* Return a buffered stream corresponding to FILE, a file name. */ | |
403 | BUFFERED_STREAM * | |
404 | open_buffered_stream (file) | |
405 | char *file; | |
406 | { | |
407 | int fd; | |
408 | ||
409 | fd = open (file, O_RDONLY); | |
ccc6cda3 | 410 | return ((fd >= 0) ? fd_to_buffered_stream (fd) : (BUFFERED_STREAM *)NULL); |
726f6388 JA |
411 | } |
412 | ||
413 | /* Deallocate a buffered stream and free up its resources. Make sure we | |
414 | zero out the slot in BUFFERS that points to BP. */ | |
415 | void | |
416 | free_buffered_stream (bp) | |
417 | BUFFERED_STREAM *bp; | |
418 | { | |
419 | int n; | |
420 | ||
421 | if (!bp) | |
422 | return; | |
423 | ||
424 | n = bp->b_fd; | |
425 | if (bp->b_buffer) | |
426 | free (bp->b_buffer); | |
427 | free (bp); | |
428 | buffers[n] = (BUFFERED_STREAM *)NULL; | |
429 | } | |
430 | ||
431 | /* Close the file descriptor associated with BP, a buffered stream, and free | |
432 | up the stream. Return the status of closing BP's file descriptor. */ | |
433 | int | |
434 | close_buffered_stream (bp) | |
435 | BUFFERED_STREAM *bp; | |
436 | { | |
437 | int fd; | |
438 | ||
439 | if (!bp) | |
440 | return (0); | |
441 | fd = bp->b_fd; | |
442 | free_buffered_stream (bp); | |
443 | return (close (fd)); | |
444 | } | |
445 | ||
446 | /* Deallocate the buffered stream associated with file descriptor FD, and | |
447 | close FD. Return the status of the close on FD. */ | |
448 | int | |
449 | close_buffered_fd (fd) | |
450 | int fd; | |
451 | { | |
f73dda09 JA |
452 | if (fd < 0) |
453 | { | |
454 | errno = EBADF; | |
455 | return -1; | |
456 | } | |
726f6388 JA |
457 | if (fd >= nbuffers || !buffers || !buffers[fd]) |
458 | return (close (fd)); | |
459 | return (close_buffered_stream (buffers[fd])); | |
460 | } | |
461 | ||
39feef01 | 462 | /* Make the BUFFERED_STREAM associated with buffers[FD] be BP, and return |
cce855bc JA |
463 | the old BUFFERED_STREAM. */ |
464 | BUFFERED_STREAM * | |
465 | set_buffered_stream (fd, bp) | |
466 | int fd; | |
467 | BUFFERED_STREAM *bp; | |
468 | { | |
469 | BUFFERED_STREAM *ret; | |
470 | ||
471 | ret = buffers[fd]; | |
472 | buffers[fd] = bp; | |
473 | return ret; | |
474 | } | |
475 | ||
726f6388 JA |
476 | /* Read a buffer full of characters from BP, a buffered stream. */ |
477 | static int | |
478 | b_fill_buffer (bp) | |
479 | BUFFERED_STREAM *bp; | |
480 | { | |
f73dda09 | 481 | ssize_t nr; |
54a1fa7c | 482 | off_t o; |
f73dda09 | 483 | |
ac18b312 | 484 | CHECK_TERMSIG; |
54a1fa7c CR |
485 | /* In an environment where text and binary files are treated differently, |
486 | compensate for lseek() on text files returning an offset different from | |
487 | the count of characters read() returns. Text-mode streams have to be | |
488 | treated as unbuffered. */ | |
489 | if ((bp->b_flag & (B_TEXT | B_UNBUFF)) == B_TEXT) | |
490 | { | |
491 | o = lseek (bp->b_fd, 0, SEEK_CUR); | |
492 | nr = zread (bp->b_fd, bp->b_buffer, bp->b_size); | |
493 | if (nr > 0 && nr < lseek (bp->b_fd, 0, SEEK_CUR) - o) | |
494 | { | |
495 | lseek (bp->b_fd, o, SEEK_SET); | |
496 | bp->b_flag |= B_UNBUFF; | |
497 | bp->b_size = 1; | |
498 | nr = zread (bp->b_fd, bp->b_buffer, bp->b_size); | |
499 | } | |
500 | } | |
501 | else | |
502 | nr = zread (bp->b_fd, bp->b_buffer, bp->b_size); | |
f73dda09 | 503 | if (nr <= 0) |
726f6388 | 504 | { |
f73dda09 | 505 | bp->b_used = 0; |
726f6388 | 506 | bp->b_buffer[0] = 0; |
f73dda09 | 507 | if (nr == 0) |
726f6388 JA |
508 | bp->b_flag |= B_EOF; |
509 | else | |
510 | bp->b_flag |= B_ERROR; | |
511 | return (EOF); | |
512 | } | |
f73dda09 | 513 | |
f73dda09 | 514 | bp->b_used = nr; |
726f6388 JA |
515 | bp->b_inputp = 0; |
516 | return (bp->b_buffer[bp->b_inputp++] & 0xFF); | |
517 | } | |
518 | ||
519 | /* Get a character from buffered stream BP. */ | |
520 | #define bufstream_getc(bp) \ | |
521 | (bp->b_inputp == bp->b_used || !bp->b_used) \ | |
522 | ? b_fill_buffer (bp) \ | |
523 | : bp->b_buffer[bp->b_inputp++] & 0xFF | |
524 | ||
525 | /* Push C back onto buffered stream BP. */ | |
526 | static int | |
527 | bufstream_ungetc(c, bp) | |
528 | int c; | |
529 | BUFFERED_STREAM *bp; | |
530 | { | |
531 | if (c == EOF || bp->b_inputp == 0) | |
532 | return (EOF); | |
533 | ||
534 | bp->b_buffer[--bp->b_inputp] = c; | |
535 | return (c); | |
536 | } | |
537 | ||
538 | /* Seek backwards on file BFD to synchronize what we've read so far | |
539 | with the underlying file pointer. */ | |
540 | int | |
541 | sync_buffered_stream (bfd) | |
542 | int bfd; | |
543 | { | |
544 | BUFFERED_STREAM *bp; | |
ccc6cda3 | 545 | off_t chars_left; |
726f6388 | 546 | |
28ef6c31 | 547 | if (buffers == 0 || (bp = buffers[bfd]) == 0) |
726f6388 | 548 | return (-1); |
28ef6c31 | 549 | |
726f6388 JA |
550 | chars_left = bp->b_used - bp->b_inputp; |
551 | if (chars_left) | |
552 | lseek (bp->b_fd, -chars_left, SEEK_CUR); | |
553 | bp->b_used = bp->b_inputp = 0; | |
554 | return (0); | |
555 | } | |
556 | ||
557 | int | |
558 | buffered_getchar () | |
559 | { | |
ac18b312 CR |
560 | CHECK_TERMSIG; |
561 | ||
28ef6c31 | 562 | #if !defined (DJGPP) |
726f6388 | 563 | return (bufstream_getc (buffers[bash_input.location.buffered_fd])); |
28ef6c31 JA |
564 | #else |
565 | /* On DJGPP, ignore \r. */ | |
566 | int ch; | |
567 | while ((ch = bufstream_getc (buffers[bash_input.location.buffered_fd])) == '\r') | |
568 | ; | |
569 | return ch; | |
570 | #endif | |
726f6388 JA |
571 | } |
572 | ||
573 | int | |
574 | buffered_ungetchar (c) | |
575 | int c; | |
576 | { | |
577 | return (bufstream_ungetc (c, buffers[bash_input.location.buffered_fd])); | |
578 | } | |
579 | ||
580 | /* Make input come from file descriptor BFD through a buffered stream. */ | |
581 | void | |
582 | with_input_from_buffered_stream (bfd, name) | |
583 | int bfd; | |
584 | char *name; | |
585 | { | |
586 | INPUT_STREAM location; | |
ccc6cda3 | 587 | BUFFERED_STREAM *bp; |
726f6388 JA |
588 | |
589 | location.buffered_fd = bfd; | |
590 | /* Make sure the buffered stream exists. */ | |
ccc6cda3 JA |
591 | bp = fd_to_buffered_stream (bfd); |
592 | init_yy_io (bp == 0 ? return_EOF : buffered_getchar, | |
593 | buffered_ungetchar, st_bstream, name, location); | |
726f6388 JA |
594 | } |
595 | ||
596 | #if defined (TEST) | |
f73dda09 | 597 | void * |
726f6388 JA |
598 | xmalloc(s) |
599 | int s; | |
600 | { | |
f73dda09 | 601 | return (malloc (s)); |
726f6388 JA |
602 | } |
603 | ||
f73dda09 | 604 | void * |
726f6388 JA |
605 | xrealloc(s, size) |
606 | char *s; | |
607 | int size; | |
608 | { | |
609 | if (!s) | |
f73dda09 | 610 | return(malloc (size)); |
726f6388 | 611 | else |
f73dda09 | 612 | return(realloc (s, size)); |
726f6388 JA |
613 | } |
614 | ||
615 | void | |
616 | init_yy_io () | |
617 | { | |
618 | } | |
619 | ||
620 | process(bp) | |
621 | BUFFERED_STREAM *bp; | |
622 | { | |
623 | int c; | |
624 | ||
625 | while ((c = bufstream_getc(bp)) != EOF) | |
626 | putchar(c); | |
627 | } | |
628 | ||
629 | BASH_INPUT bash_input; | |
630 | ||
631 | struct stat dsb; /* can be used from gdb */ | |
632 | ||
633 | /* imitate /bin/cat */ | |
634 | main(argc, argv) | |
635 | int argc; | |
636 | char **argv; | |
637 | { | |
638 | register int i; | |
639 | BUFFERED_STREAM *bp; | |
640 | ||
641 | if (argc == 1) { | |
642 | bp = fd_to_buffered_stream (0); | |
643 | process(bp); | |
644 | exit(0); | |
645 | } | |
646 | for (i = 1; i < argc; i++) { | |
647 | if (argv[i][0] == '-' && argv[i][1] == '\0') { | |
648 | bp = fd_to_buffered_stream (0); | |
649 | if (!bp) | |
650 | continue; | |
651 | process(bp); | |
652 | free_buffered_stream (bp); | |
653 | } else { | |
654 | bp = open_buffered_stream (argv[i]); | |
655 | if (!bp) | |
656 | continue; | |
657 | process(bp); | |
658 | close_buffered_stream (bp); | |
659 | } | |
660 | } | |
661 | exit(0); | |
662 | } | |
ccc6cda3 JA |
663 | #endif /* TEST */ |
664 | #endif /* BUFFERED_INPUT */ |