]>
Commit | Line | Data |
---|---|---|
726f6388 JA |
1 | /* input.c -- functions to perform buffered input with synchronization. */ |
2 | ||
3 | /* Copyright (C) 1992 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of GNU Bash, the Bourne Again SHell. | |
6 | ||
7 | Bash is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 2, or (at your option) any later | |
10 | version. | |
11 | ||
12 | Bash is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License along | |
18 | with Bash; see the file COPYING. If not, write to the Free Software | |
bb70624e | 19 | Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
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" |
726f6388 JA |
45 | |
46 | #if !defined (errno) | |
47 | extern int errno; | |
48 | #endif /* !errno */ | |
49 | ||
0628567a JA |
50 | extern void termsig_handler __P((int)); |
51 | ||
ccc6cda3 JA |
52 | /* Functions to handle reading input on systems that don't restart read(2) |
53 | if a signal is received. */ | |
54 | ||
f73dda09 | 55 | static char localbuf[128]; |
95732b49 | 56 | static int local_index = 0, local_bufused = 0; |
ccc6cda3 JA |
57 | |
58 | /* Posix and USG systems do not guarantee to restart read () if it is | |
59 | interrupted by a signal. We do the read ourselves, and restart it | |
60 | if it returns EINTR. */ | |
61 | int | |
62 | getc_with_restart (stream) | |
63 | FILE *stream; | |
64 | { | |
f73dda09 JA |
65 | unsigned char uc; |
66 | ||
0628567a JA |
67 | CHECK_TERMSIG; |
68 | ||
ccc6cda3 JA |
69 | /* Try local buffering to reduce the number of read(2) calls. */ |
70 | if (local_index == local_bufused || local_bufused == 0) | |
71 | { | |
72 | while (1) | |
73 | { | |
0628567a | 74 | CHECK_TERMSIG; |
ccc6cda3 JA |
75 | local_bufused = read (fileno (stream), localbuf, sizeof(localbuf)); |
76 | if (local_bufused > 0) | |
77 | break; | |
78 | else if (local_bufused == 0 || errno != EINTR) | |
79 | { | |
80 | local_index = 0; | |
81 | return EOF; | |
82 | } | |
83 | } | |
84 | local_index = 0; | |
85 | } | |
f73dda09 JA |
86 | uc = localbuf[local_index++]; |
87 | return uc; | |
ccc6cda3 JA |
88 | } |
89 | ||
90 | int | |
91 | ungetc_with_restart (c, stream) | |
92 | int c; | |
93 | FILE *stream; | |
94 | { | |
95 | if (local_index == 0 || c == EOF) | |
96 | return EOF; | |
f73dda09 JA |
97 | localbuf[--local_index] = c; |
98 | return c; | |
ccc6cda3 | 99 | } |
ccc6cda3 JA |
100 | |
101 | #if defined (BUFFERED_INPUT) | |
102 | ||
103 | /* A facility similar to stdio, but input-only. */ | |
104 | ||
bb70624e JA |
105 | #if defined (USING_BASH_MALLOC) |
106 | # define MAX_INPUT_BUFFER_SIZE 8176 | |
107 | #else | |
108 | # define MAX_INPUT_BUFFER_SIZE 8192 | |
109 | #endif | |
726f6388 JA |
110 | |
111 | #if !defined (SEEK_CUR) | |
112 | # define SEEK_CUR 1 | |
113 | #endif /* !SEEK_CUR */ | |
114 | ||
28ef6c31 JA |
115 | #ifdef max |
116 | # undef max | |
117 | #endif | |
118 | #define max(a, b) (((a) > (b)) ? (a) : (b)) | |
119 | #ifdef min | |
120 | # undef min | |
121 | #endif | |
122 | #define min(a, b) ((a) > (b) ? (b) : (a)) | |
123 | ||
726f6388 JA |
124 | extern int interactive_shell; |
125 | ||
126 | int bash_input_fd_changed; | |
ccc6cda3 | 127 | |
726f6388 JA |
128 | /* This provides a way to map from a file descriptor to the buffer |
129 | associated with that file descriptor, rather than just the other | |
130 | way around. This is needed so that buffers are managed properly | |
131 | in constructs like 3<&4. buffers[x]->b_fd == x -- that is how the | |
132 | correspondence is maintained. */ | |
cce855bc | 133 | static BUFFERED_STREAM **buffers = (BUFFERED_STREAM **)NULL; |
ccc6cda3 | 134 | static int nbuffers; |
726f6388 | 135 | |
726f6388 JA |
136 | #define ALLOCATE_BUFFERS(n) \ |
137 | do { if ((n) >= nbuffers) allocate_buffers (n); } while (0) | |
138 | ||
139 | /* Make sure `buffers' has at least N elements. */ | |
140 | static void | |
141 | allocate_buffers (n) | |
142 | int n; | |
143 | { | |
144 | register int i, orig_nbuffers; | |
145 | ||
146 | orig_nbuffers = nbuffers; | |
147 | nbuffers = n + 20; | |
148 | buffers = (BUFFERED_STREAM **)xrealloc | |
149 | (buffers, nbuffers * sizeof (BUFFERED_STREAM *)); | |
150 | ||
151 | /* Zero out the new buffers. */ | |
152 | for (i = orig_nbuffers; i < nbuffers; i++) | |
153 | buffers[i] = (BUFFERED_STREAM *)NULL; | |
154 | } | |
155 | ||
156 | /* Construct and return a BUFFERED_STREAM corresponding to file descriptor | |
157 | FD, using BUFFER. */ | |
158 | static BUFFERED_STREAM * | |
159 | make_buffered_stream (fd, buffer, bufsize) | |
160 | int fd; | |
161 | char *buffer; | |
cce855bc | 162 | size_t bufsize; |
726f6388 JA |
163 | { |
164 | BUFFERED_STREAM *bp; | |
165 | ||
166 | bp = (BUFFERED_STREAM *)xmalloc (sizeof (BUFFERED_STREAM)); | |
167 | ALLOCATE_BUFFERS (fd); | |
168 | buffers[fd] = bp; | |
169 | bp->b_fd = fd; | |
170 | bp->b_buffer = buffer; | |
171 | bp->b_size = bufsize; | |
ccc6cda3 | 172 | bp->b_used = bp->b_inputp = bp->b_flag = 0; |
726f6388 JA |
173 | if (bufsize == 1) |
174 | bp->b_flag |= B_UNBUFF; | |
175 | return (bp); | |
176 | } | |
177 | ||
178 | /* Allocate a new BUFFERED_STREAM, copy BP to it, and return the new copy. */ | |
179 | static BUFFERED_STREAM * | |
180 | copy_buffered_stream (bp) | |
181 | BUFFERED_STREAM *bp; | |
182 | { | |
183 | BUFFERED_STREAM *nbp; | |
184 | ||
185 | if (!bp) | |
186 | return ((BUFFERED_STREAM *)NULL); | |
187 | ||
188 | nbp = (BUFFERED_STREAM *)xmalloc (sizeof (BUFFERED_STREAM)); | |
189 | xbcopy ((char *)bp, (char *)nbp, sizeof (BUFFERED_STREAM)); | |
190 | return (nbp); | |
191 | } | |
192 | ||
28ef6c31 JA |
193 | int |
194 | set_bash_input_fd (fd) | |
195 | int fd; | |
196 | { | |
197 | if (bash_input.type == st_bstream) | |
198 | bash_input.location.buffered_fd = fd; | |
199 | else if (interactive_shell == 0) | |
200 | default_buffered_input = fd; | |
201 | return 0; | |
202 | } | |
203 | ||
204 | int | |
205 | fd_is_bash_input (fd) | |
206 | int fd; | |
207 | { | |
208 | if (bash_input.type == st_bstream && bash_input.location.buffered_fd == fd) | |
209 | return 1; | |
210 | else if (interactive_shell == 0 && default_buffered_input == fd) | |
211 | return 1; | |
212 | return 0; | |
213 | } | |
214 | ||
215 | /* Save the buffered stream corresponding to file descriptor FD (which bash | |
216 | is using to read input) to a buffered stream associated with NEW_FD. If | |
217 | NEW_FD is -1, a new file descriptor is allocated with fcntl. The new | |
218 | file descriptor is returned on success, -1 on error. */ | |
219 | int | |
220 | save_bash_input (fd, new_fd) | |
221 | int fd, new_fd; | |
222 | { | |
223 | int nfd; | |
224 | ||
225 | /* Sync the stream so we can re-read from the new file descriptor. We | |
226 | might be able to avoid this by copying the buffered stream verbatim | |
227 | to the new file descriptor. */ | |
228 | if (buffers[fd]) | |
229 | sync_buffered_stream (fd); | |
230 | ||
231 | /* Now take care of duplicating the file descriptor that bash is | |
232 | using for input, so we can reinitialize it later. */ | |
233 | nfd = (new_fd == -1) ? fcntl (fd, F_DUPFD, 10) : new_fd; | |
234 | if (nfd == -1) | |
235 | { | |
236 | if (fcntl (fd, F_GETFD, 0) == 0) | |
b80f6443 | 237 | sys_error (_("cannot allocate new file descriptor for bash input from fd %d"), fd); |
28ef6c31 JA |
238 | return -1; |
239 | } | |
240 | ||
241 | if (buffers[nfd]) | |
242 | { | |
243 | /* What's this? A stray buffer without an associated open file | |
244 | descriptor? Free up the buffer and report the error. */ | |
b80f6443 | 245 | internal_error (_("save_bash_input: buffer already exists for new fd %d"), nfd); |
28ef6c31 JA |
246 | free_buffered_stream (buffers[nfd]); |
247 | } | |
248 | ||
249 | /* Reinitialize bash_input.location. */ | |
250 | if (bash_input.type == st_bstream) | |
251 | { | |
252 | bash_input.location.buffered_fd = nfd; | |
253 | fd_to_buffered_stream (nfd); | |
254 | close_buffered_fd (fd); /* XXX */ | |
255 | } | |
256 | else | |
257 | /* If the current input type is not a buffered stream, but the shell | |
258 | is not interactive and therefore using a buffered stream to read | |
259 | input (e.g. with an `eval exec 3>output' inside a script), note | |
260 | that the input fd has been changed. pop_stream() looks at this | |
261 | value and adjusts the input fd to the new value of | |
262 | default_buffered_input accordingly. */ | |
263 | bash_input_fd_changed++; | |
264 | ||
265 | if (default_buffered_input == fd) | |
266 | default_buffered_input = nfd; | |
267 | ||
268 | SET_CLOSE_ON_EXEC (nfd); | |
269 | return nfd; | |
270 | } | |
271 | ||
726f6388 JA |
272 | /* Check that file descriptor FD is not the one that bash is currently |
273 | using to read input from a script. FD is about to be duplicated onto, | |
274 | which means that the kernel will close it for us. If FD is the bash | |
275 | input file descriptor, we need to seek backwards in the script (if | |
276 | possible and necessary -- scripts read from stdin are still unbuffered), | |
277 | allocate a new file descriptor to use for bash input, and re-initialize | |
28ef6c31 JA |
278 | the buffered stream. Make sure the file descriptor used to save bash |
279 | input is set close-on-exec. Returns 0 on success, -1 on failure. This | |
280 | works only if fd is > 0 -- if fd == 0 and bash is reading input from | |
281 | fd 0, save_bash_input is used instead, to cooperate with input | |
282 | redirection (look at redir.c:add_undo_redirect()). */ | |
726f6388 JA |
283 | int |
284 | check_bash_input (fd) | |
285 | int fd; | |
286 | { | |
b80f6443 JA |
287 | if (fd_is_bash_input (fd)) |
288 | { | |
289 | if (fd > 0) | |
290 | return ((save_bash_input (fd, -1) == -1) ? -1 : 0); | |
291 | else if (fd == 0) | |
292 | return ((sync_buffered_stream (fd) == -1) ? -1 : 0); | |
293 | } | |
726f6388 JA |
294 | return 0; |
295 | } | |
296 | ||
297 | /* This is the buffered stream analogue of dup2(fd1, fd2). The | |
298 | BUFFERED_STREAM corresponding to fd2 is deallocated, if one exists. | |
299 | BUFFERS[fd1] is copied to BUFFERS[fd2]. This is called by the | |
300 | redirect code for constructs like 4<&0 and 3</etc/rc.local. */ | |
ccc6cda3 | 301 | int |
726f6388 JA |
302 | duplicate_buffered_stream (fd1, fd2) |
303 | int fd1, fd2; | |
304 | { | |
305 | int is_bash_input, m; | |
306 | ||
307 | if (fd1 == fd2) | |
308 | return 0; | |
309 | ||
310 | m = max (fd1, fd2); | |
311 | ALLOCATE_BUFFERS (m); | |
312 | ||
313 | /* If FD2 is the file descriptor bash is currently using for shell input, | |
314 | we need to do some extra work to make sure that the buffered stream | |
315 | actually exists (it might not if fd1 was not active, and the copy | |
316 | didn't actually do anything). */ | |
317 | is_bash_input = (bash_input.type == st_bstream) && | |
318 | (bash_input.location.buffered_fd == fd2); | |
319 | ||
320 | if (buffers[fd2]) | |
95732b49 JA |
321 | { |
322 | /* If the two objects share the same b_buffer, don't free it. */ | |
323 | if (buffers[fd1] && buffers[fd1]->b_buffer && buffers[fd1]->b_buffer == buffers[fd2]->b_buffer) | |
324 | buffers[fd2] = (BUFFERED_STREAM *)NULL; | |
325 | else | |
326 | free_buffered_stream (buffers[fd2]); | |
327 | } | |
726f6388 JA |
328 | buffers[fd2] = copy_buffered_stream (buffers[fd1]); |
329 | if (buffers[fd2]) | |
330 | buffers[fd2]->b_fd = fd2; | |
331 | ||
28ef6c31 JA |
332 | if (is_bash_input) |
333 | { | |
334 | if (!buffers[fd2]) | |
335 | fd_to_buffered_stream (fd2); | |
336 | buffers[fd2]->b_flag |= B_WASBASHINPUT; | |
337 | } | |
ccc6cda3 | 338 | |
726f6388 JA |
339 | return (fd2); |
340 | } | |
341 | ||
342 | /* Return 1 if a seek on FD will succeed. */ | |
28ef6c31 | 343 | #ifndef __CYGWIN__ |
cce855bc JA |
344 | # define fd_is_seekable(fd) (lseek ((fd), 0L, SEEK_CUR) >= 0) |
345 | #else | |
346 | # define fd_is_seekable(fd) 0 | |
28ef6c31 | 347 | #endif /* __CYGWIN__ */ |
726f6388 JA |
348 | |
349 | /* Take FD, a file descriptor, and create and return a buffered stream | |
350 | corresponding to it. If something is wrong and the file descriptor | |
351 | is invalid, return a NULL stream. */ | |
352 | BUFFERED_STREAM * | |
353 | fd_to_buffered_stream (fd) | |
354 | int fd; | |
355 | { | |
356 | char *buffer; | |
cce855bc | 357 | size_t size; |
726f6388 JA |
358 | struct stat sb; |
359 | ||
360 | if (fstat (fd, &sb) < 0) | |
361 | { | |
362 | close (fd); | |
363 | return ((BUFFERED_STREAM *)NULL); | |
364 | } | |
365 | ||
28ef6c31 JA |
366 | size = (fd_is_seekable (fd)) ? min (sb.st_size, MAX_INPUT_BUFFER_SIZE) : 1; |
367 | if (size == 0) | |
726f6388 | 368 | size = 1; |
726f6388 JA |
369 | buffer = (char *)xmalloc (size); |
370 | ||
371 | return (make_buffered_stream (fd, buffer, size)); | |
372 | } | |
373 | ||
374 | /* Return a buffered stream corresponding to FILE, a file name. */ | |
375 | BUFFERED_STREAM * | |
376 | open_buffered_stream (file) | |
377 | char *file; | |
378 | { | |
379 | int fd; | |
380 | ||
381 | fd = open (file, O_RDONLY); | |
ccc6cda3 | 382 | return ((fd >= 0) ? fd_to_buffered_stream (fd) : (BUFFERED_STREAM *)NULL); |
726f6388 JA |
383 | } |
384 | ||
385 | /* Deallocate a buffered stream and free up its resources. Make sure we | |
386 | zero out the slot in BUFFERS that points to BP. */ | |
387 | void | |
388 | free_buffered_stream (bp) | |
389 | BUFFERED_STREAM *bp; | |
390 | { | |
391 | int n; | |
392 | ||
393 | if (!bp) | |
394 | return; | |
395 | ||
396 | n = bp->b_fd; | |
397 | if (bp->b_buffer) | |
398 | free (bp->b_buffer); | |
399 | free (bp); | |
400 | buffers[n] = (BUFFERED_STREAM *)NULL; | |
401 | } | |
402 | ||
403 | /* Close the file descriptor associated with BP, a buffered stream, and free | |
404 | up the stream. Return the status of closing BP's file descriptor. */ | |
405 | int | |
406 | close_buffered_stream (bp) | |
407 | BUFFERED_STREAM *bp; | |
408 | { | |
409 | int fd; | |
410 | ||
411 | if (!bp) | |
412 | return (0); | |
413 | fd = bp->b_fd; | |
414 | free_buffered_stream (bp); | |
415 | return (close (fd)); | |
416 | } | |
417 | ||
418 | /* Deallocate the buffered stream associated with file descriptor FD, and | |
419 | close FD. Return the status of the close on FD. */ | |
420 | int | |
421 | close_buffered_fd (fd) | |
422 | int fd; | |
423 | { | |
f73dda09 JA |
424 | if (fd < 0) |
425 | { | |
426 | errno = EBADF; | |
427 | return -1; | |
428 | } | |
726f6388 JA |
429 | if (fd >= nbuffers || !buffers || !buffers[fd]) |
430 | return (close (fd)); | |
431 | return (close_buffered_stream (buffers[fd])); | |
432 | } | |
433 | ||
cce855bc JA |
434 | /* Make the BUFFERED_STREAM associcated with buffers[FD] be BP, and return |
435 | the old BUFFERED_STREAM. */ | |
436 | BUFFERED_STREAM * | |
437 | set_buffered_stream (fd, bp) | |
438 | int fd; | |
439 | BUFFERED_STREAM *bp; | |
440 | { | |
441 | BUFFERED_STREAM *ret; | |
442 | ||
443 | ret = buffers[fd]; | |
444 | buffers[fd] = bp; | |
445 | return ret; | |
446 | } | |
447 | ||
726f6388 JA |
448 | /* Read a buffer full of characters from BP, a buffered stream. */ |
449 | static int | |
450 | b_fill_buffer (bp) | |
451 | BUFFERED_STREAM *bp; | |
452 | { | |
f73dda09 JA |
453 | ssize_t nr; |
454 | ||
0628567a | 455 | CHECK_TERMSIG; |
f73dda09 JA |
456 | nr = zread (bp->b_fd, bp->b_buffer, bp->b_size); |
457 | if (nr <= 0) | |
726f6388 | 458 | { |
f73dda09 | 459 | bp->b_used = 0; |
726f6388 | 460 | bp->b_buffer[0] = 0; |
f73dda09 | 461 | if (nr == 0) |
726f6388 JA |
462 | bp->b_flag |= B_EOF; |
463 | else | |
464 | bp->b_flag |= B_ERROR; | |
465 | return (EOF); | |
466 | } | |
f73dda09 JA |
467 | |
468 | #if defined (__CYGWIN__) | |
469 | /* If on cygwin, translate \r\n to \n. */ | |
470 | if (nr >= 2 && bp->b_buffer[nr - 2] == '\r' && bp->b_buffer[nr - 1] == '\n') | |
471 | { | |
472 | bp->b_buffer[nr - 2] = '\n'; | |
473 | nr--; | |
474 | } | |
475 | #endif | |
476 | ||
477 | bp->b_used = nr; | |
726f6388 JA |
478 | bp->b_inputp = 0; |
479 | return (bp->b_buffer[bp->b_inputp++] & 0xFF); | |
480 | } | |
481 | ||
482 | /* Get a character from buffered stream BP. */ | |
483 | #define bufstream_getc(bp) \ | |
484 | (bp->b_inputp == bp->b_used || !bp->b_used) \ | |
485 | ? b_fill_buffer (bp) \ | |
486 | : bp->b_buffer[bp->b_inputp++] & 0xFF | |
487 | ||
488 | /* Push C back onto buffered stream BP. */ | |
489 | static int | |
490 | bufstream_ungetc(c, bp) | |
491 | int c; | |
492 | BUFFERED_STREAM *bp; | |
493 | { | |
494 | if (c == EOF || bp->b_inputp == 0) | |
495 | return (EOF); | |
496 | ||
497 | bp->b_buffer[--bp->b_inputp] = c; | |
498 | return (c); | |
499 | } | |
500 | ||
501 | /* Seek backwards on file BFD to synchronize what we've read so far | |
502 | with the underlying file pointer. */ | |
503 | int | |
504 | sync_buffered_stream (bfd) | |
505 | int bfd; | |
506 | { | |
507 | BUFFERED_STREAM *bp; | |
ccc6cda3 | 508 | off_t chars_left; |
726f6388 | 509 | |
28ef6c31 | 510 | if (buffers == 0 || (bp = buffers[bfd]) == 0) |
726f6388 | 511 | return (-1); |
28ef6c31 | 512 | |
726f6388 JA |
513 | chars_left = bp->b_used - bp->b_inputp; |
514 | if (chars_left) | |
515 | lseek (bp->b_fd, -chars_left, SEEK_CUR); | |
516 | bp->b_used = bp->b_inputp = 0; | |
517 | return (0); | |
518 | } | |
519 | ||
520 | int | |
521 | buffered_getchar () | |
522 | { | |
0628567a JA |
523 | CHECK_TERMSIG; |
524 | ||
28ef6c31 | 525 | #if !defined (DJGPP) |
726f6388 | 526 | return (bufstream_getc (buffers[bash_input.location.buffered_fd])); |
28ef6c31 JA |
527 | #else |
528 | /* On DJGPP, ignore \r. */ | |
529 | int ch; | |
530 | while ((ch = bufstream_getc (buffers[bash_input.location.buffered_fd])) == '\r') | |
531 | ; | |
532 | return ch; | |
533 | #endif | |
726f6388 JA |
534 | } |
535 | ||
536 | int | |
537 | buffered_ungetchar (c) | |
538 | int c; | |
539 | { | |
540 | return (bufstream_ungetc (c, buffers[bash_input.location.buffered_fd])); | |
541 | } | |
542 | ||
543 | /* Make input come from file descriptor BFD through a buffered stream. */ | |
544 | void | |
545 | with_input_from_buffered_stream (bfd, name) | |
546 | int bfd; | |
547 | char *name; | |
548 | { | |
549 | INPUT_STREAM location; | |
ccc6cda3 | 550 | BUFFERED_STREAM *bp; |
726f6388 JA |
551 | |
552 | location.buffered_fd = bfd; | |
553 | /* Make sure the buffered stream exists. */ | |
ccc6cda3 JA |
554 | bp = fd_to_buffered_stream (bfd); |
555 | init_yy_io (bp == 0 ? return_EOF : buffered_getchar, | |
556 | buffered_ungetchar, st_bstream, name, location); | |
726f6388 JA |
557 | } |
558 | ||
559 | #if defined (TEST) | |
f73dda09 | 560 | void * |
726f6388 JA |
561 | xmalloc(s) |
562 | int s; | |
563 | { | |
f73dda09 | 564 | return (malloc (s)); |
726f6388 JA |
565 | } |
566 | ||
f73dda09 | 567 | void * |
726f6388 JA |
568 | xrealloc(s, size) |
569 | char *s; | |
570 | int size; | |
571 | { | |
572 | if (!s) | |
f73dda09 | 573 | return(malloc (size)); |
726f6388 | 574 | else |
f73dda09 | 575 | return(realloc (s, size)); |
726f6388 JA |
576 | } |
577 | ||
578 | void | |
579 | init_yy_io () | |
580 | { | |
581 | } | |
582 | ||
583 | process(bp) | |
584 | BUFFERED_STREAM *bp; | |
585 | { | |
586 | int c; | |
587 | ||
588 | while ((c = bufstream_getc(bp)) != EOF) | |
589 | putchar(c); | |
590 | } | |
591 | ||
592 | BASH_INPUT bash_input; | |
593 | ||
594 | struct stat dsb; /* can be used from gdb */ | |
595 | ||
596 | /* imitate /bin/cat */ | |
597 | main(argc, argv) | |
598 | int argc; | |
599 | char **argv; | |
600 | { | |
601 | register int i; | |
602 | BUFFERED_STREAM *bp; | |
603 | ||
604 | if (argc == 1) { | |
605 | bp = fd_to_buffered_stream (0); | |
606 | process(bp); | |
607 | exit(0); | |
608 | } | |
609 | for (i = 1; i < argc; i++) { | |
610 | if (argv[i][0] == '-' && argv[i][1] == '\0') { | |
611 | bp = fd_to_buffered_stream (0); | |
612 | if (!bp) | |
613 | continue; | |
614 | process(bp); | |
615 | free_buffered_stream (bp); | |
616 | } else { | |
617 | bp = open_buffered_stream (argv[i]); | |
618 | if (!bp) | |
619 | continue; | |
620 | process(bp); | |
621 | close_buffered_stream (bp); | |
622 | } | |
623 | } | |
624 | exit(0); | |
625 | } | |
ccc6cda3 JA |
626 | #endif /* TEST */ |
627 | #endif /* BUFFERED_INPUT */ |