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e213d8e0 | 1 | /* Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, |
33123ed7 | 2 | 2011, 2012 |
a0007dfa | 3 | Free Software Foundation, Inc. |
4ee9c684 | 4 | Contributed by Andy Vaught |
84d33b91 | 5 | F2003 I/O support contributed by Jerry DeLisle |
4ee9c684 | 6 | |
5e62a3cc | 7 | This file is part of the GNU Fortran runtime library (libgfortran). |
4ee9c684 | 8 | |
9 | Libgfortran is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
6bc9506f | 11 | the Free Software Foundation; either version 3, or (at your option) |
4ee9c684 | 12 | any later version. |
13 | ||
14 | Libgfortran is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
6bc9506f | 19 | Under Section 7 of GPL version 3, you are granted additional |
20 | permissions described in the GCC Runtime Library Exception, version | |
21 | 3.1, as published by the Free Software Foundation. | |
22 | ||
23 | You should have received a copy of the GNU General Public License and | |
24 | a copy of the GCC Runtime Library Exception along with this program; | |
25 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
26 | <http://www.gnu.org/licenses/>. */ | |
4ee9c684 | 27 | |
28 | /* Unix stream I/O module */ | |
29 | ||
41f2d5e8 | 30 | #include "io.h" |
f65f6629 | 31 | #include "unix.h" |
4ee9c684 | 32 | #include <stdlib.h> |
33 | #include <limits.h> | |
34 | ||
35 | #include <unistd.h> | |
36 | #include <sys/stat.h> | |
37 | #include <fcntl.h> | |
2639e4cd | 38 | #include <assert.h> |
4ee9c684 | 39 | |
4ee9c684 | 40 | #include <string.h> |
41 | #include <errno.h> | |
42 | ||
c0ecd33c | 43 | |
de28dd31 | 44 | /* min macro that evaluates its arguments only once. */ |
45 | #define min(a,b) \ | |
46 | ({ typeof (a) _a = (a); \ | |
47 | typeof (b) _b = (b); \ | |
48 | _a < _b ? _a : _b; }) | |
49 | ||
50 | ||
c0ecd33c | 51 | /* For mingw, we don't identify files by their inode number, but by a |
52 | 64-bit identifier created from a BY_HANDLE_FILE_INFORMATION. */ | |
7a4491a4 | 53 | #ifdef __MINGW32__ |
c0ecd33c | 54 | |
55 | #define WIN32_LEAN_AND_MEAN | |
56 | #include <windows.h> | |
57 | ||
f6854450 | 58 | #if !defined(_FILE_OFFSET_BITS) || _FILE_OFFSET_BITS != 64 |
59 | #undef lseek | |
4dbc0658 | 60 | #define lseek _lseeki64 |
f6854450 | 61 | #undef fstat |
7a4491a4 | 62 | #define fstat _fstati64 |
f6854450 | 63 | #undef stat |
7a4491a4 | 64 | #define stat _stati64 |
f6854450 | 65 | #endif |
4dbc0658 | 66 | |
7a4491a4 | 67 | #ifndef HAVE_WORKING_STAT |
c0ecd33c | 68 | static uint64_t |
69 | id_from_handle (HANDLE hFile) | |
70 | { | |
71 | BY_HANDLE_FILE_INFORMATION FileInformation; | |
72 | ||
73 | if (hFile == INVALID_HANDLE_VALUE) | |
74 | return 0; | |
75 | ||
76 | memset (&FileInformation, 0, sizeof(FileInformation)); | |
77 | if (!GetFileInformationByHandle (hFile, &FileInformation)) | |
78 | return 0; | |
79 | ||
80 | return ((uint64_t) FileInformation.nFileIndexLow) | |
81 | | (((uint64_t) FileInformation.nFileIndexHigh) << 32); | |
82 | } | |
83 | ||
84 | ||
85 | static uint64_t | |
86 | id_from_path (const char *path) | |
87 | { | |
88 | HANDLE hFile; | |
89 | uint64_t res; | |
90 | ||
91 | if (!path || !*path || access (path, F_OK)) | |
92 | return (uint64_t) -1; | |
93 | ||
94 | hFile = CreateFile (path, 0, 0, NULL, OPEN_EXISTING, | |
95 | FILE_FLAG_BACKUP_SEMANTICS | FILE_ATTRIBUTE_READONLY, | |
96 | NULL); | |
97 | res = id_from_handle (hFile); | |
98 | CloseHandle (hFile); | |
99 | return res; | |
100 | } | |
101 | ||
102 | ||
103 | static uint64_t | |
104 | id_from_fd (const int fd) | |
105 | { | |
106 | return id_from_handle ((HANDLE) _get_osfhandle (fd)); | |
107 | } | |
108 | ||
109 | #endif | |
7a4491a4 | 110 | #endif |
111 | ||
4ee9c684 | 112 | #ifndef PATH_MAX |
113 | #define PATH_MAX 1024 | |
114 | #endif | |
115 | ||
7dfba97b | 116 | /* These flags aren't defined on all targets (mingw32), so provide them |
117 | here. */ | |
118 | #ifndef S_IRGRP | |
119 | #define S_IRGRP 0 | |
120 | #endif | |
121 | ||
122 | #ifndef S_IWGRP | |
123 | #define S_IWGRP 0 | |
124 | #endif | |
125 | ||
126 | #ifndef S_IROTH | |
127 | #define S_IROTH 0 | |
128 | #endif | |
129 | ||
130 | #ifndef S_IWOTH | |
131 | #define S_IWOTH 0 | |
132 | #endif | |
133 | ||
76c0a846 | 134 | |
fb053cd1 | 135 | #ifndef HAVE_ACCESS |
136 | ||
137 | #ifndef W_OK | |
138 | #define W_OK 2 | |
139 | #endif | |
140 | ||
141 | #ifndef R_OK | |
142 | #define R_OK 4 | |
143 | #endif | |
144 | ||
145 | #ifndef F_OK | |
146 | #define F_OK 0 | |
147 | #endif | |
148 | ||
149 | /* Fallback implementation of access() on systems that don't have it. | |
150 | Only modes R_OK, W_OK and F_OK are used in this file. */ | |
151 | ||
152 | static int | |
153 | fallback_access (const char *path, int mode) | |
154 | { | |
398e846b | 155 | int fd; |
156 | ||
157 | if ((mode & R_OK) && (fd = open (path, O_RDONLY)) < 0) | |
fb053cd1 | 158 | return -1; |
398e846b | 159 | close (fd); |
fb053cd1 | 160 | |
398e846b | 161 | if ((mode & W_OK) && (fd = open (path, O_WRONLY)) < 0) |
fb053cd1 | 162 | return -1; |
398e846b | 163 | close (fd); |
fb053cd1 | 164 | |
165 | if (mode == F_OK) | |
166 | { | |
f6854450 | 167 | struct stat st; |
fb053cd1 | 168 | return stat (path, &st); |
169 | } | |
170 | ||
171 | return 0; | |
172 | } | |
173 | ||
174 | #undef access | |
175 | #define access fallback_access | |
176 | #endif | |
177 | ||
178 | ||
65f15010 | 179 | /* Unix and internal stream I/O module */ |
76c0a846 | 180 | |
65f15010 | 181 | static const int BUFFER_SIZE = 8192; |
76c0a846 | 182 | |
3479b863 | 183 | typedef struct |
184 | { | |
185 | stream st; | |
186 | ||
187 | gfc_offset buffer_offset; /* File offset of the start of the buffer */ | |
188 | gfc_offset physical_offset; /* Current physical file offset */ | |
189 | gfc_offset logical_offset; /* Current logical file offset */ | |
cc65b133 | 190 | gfc_offset file_length; /* Length of the file. */ |
3479b863 | 191 | |
192 | char *buffer; /* Pointer to the buffer. */ | |
193 | int fd; /* The POSIX file descriptor. */ | |
194 | ||
195 | int active; /* Length of valid bytes in the buffer */ | |
196 | ||
197 | int ndirty; /* Dirty bytes starting at buffer_offset */ | |
198 | ||
01cd2c93 | 199 | /* Cached stat(2) values. */ |
200 | dev_t st_dev; | |
201 | ino_t st_ino; | |
3479b863 | 202 | } |
203 | unix_stream; | |
204 | ||
205 | ||
4ee9c684 | 206 | /* fix_fd()-- Given a file descriptor, make sure it is not one of the |
207 | * standard descriptors, returning a non-standard descriptor. If the | |
208 | * user specifies that system errors should go to standard output, | |
209 | * then closes standard output, we don't want the system errors to a | |
210 | * file that has been given file descriptor 1 or 0. We want to send | |
211 | * the error to the invalid descriptor. */ | |
212 | ||
213 | static int | |
214 | fix_fd (int fd) | |
215 | { | |
e0582811 | 216 | #ifdef HAVE_DUP |
4ee9c684 | 217 | int input, output, error; |
218 | ||
219 | input = output = error = 0; | |
220 | ||
7145fd06 | 221 | /* Unix allocates the lowest descriptors first, so a loop is not |
222 | required, but this order is. */ | |
4ee9c684 | 223 | if (fd == STDIN_FILENO) |
224 | { | |
225 | fd = dup (fd); | |
226 | input = 1; | |
227 | } | |
228 | if (fd == STDOUT_FILENO) | |
229 | { | |
230 | fd = dup (fd); | |
231 | output = 1; | |
232 | } | |
233 | if (fd == STDERR_FILENO) | |
234 | { | |
235 | fd = dup (fd); | |
236 | error = 1; | |
237 | } | |
238 | ||
239 | if (input) | |
240 | close (STDIN_FILENO); | |
241 | if (output) | |
242 | close (STDOUT_FILENO); | |
243 | if (error) | |
244 | close (STDERR_FILENO); | |
e0582811 | 245 | #endif |
4ee9c684 | 246 | |
247 | return fd; | |
248 | } | |
249 | ||
250 | ||
2488b3b6 | 251 | /* If the stream corresponds to a preconnected unit, we flush the |
252 | corresponding C stream. This is bugware for mixed C-Fortran codes | |
253 | where the C code doesn't flush I/O before returning. */ | |
254 | void | |
255 | flush_if_preconnected (stream * s) | |
256 | { | |
257 | int fd; | |
258 | ||
259 | fd = ((unix_stream *) s)->fd; | |
260 | if (fd == STDIN_FILENO) | |
261 | fflush (stdin); | |
262 | else if (fd == STDOUT_FILENO) | |
263 | fflush (stdout); | |
264 | else if (fd == STDERR_FILENO) | |
265 | fflush (stderr); | |
266 | } | |
267 | ||
4ee9c684 | 268 | |
65f15010 | 269 | /******************************************************************** |
270 | Raw I/O functions (read, write, seek, tell, truncate, close). | |
271 | ||
272 | These functions wrap the basic POSIX I/O syscalls. Any deviation in | |
273 | semantics is a bug, except the following: write restarts in case | |
274 | of being interrupted by a signal, and as the first argument the | |
275 | functions take the unix_stream struct rather than an integer file | |
276 | descriptor. Also, for POSIX read() and write() a nbyte argument larger | |
277 | than SSIZE_MAX is undefined; here the type of nbyte is ssize_t rather | |
278 | than size_t as for POSIX read/write. | |
279 | *********************************************************************/ | |
4ee9c684 | 280 | |
b2a112ca | 281 | static int |
65f15010 | 282 | raw_flush (unix_stream * s __attribute__ ((unused))) |
b2a112ca | 283 | { |
65f15010 | 284 | return 0; |
4ee9c684 | 285 | } |
286 | ||
65f15010 | 287 | static ssize_t |
288 | raw_read (unix_stream * s, void * buf, ssize_t nbyte) | |
289 | { | |
290 | /* For read we can't do I/O in a loop like raw_write does, because | |
291 | that will break applications that wait for interactive I/O. */ | |
292 | return read (s->fd, buf, nbyte); | |
293 | } | |
4ee9c684 | 294 | |
65f15010 | 295 | static ssize_t |
296 | raw_write (unix_stream * s, const void * buf, ssize_t nbyte) | |
4ee9c684 | 297 | { |
65f15010 | 298 | ssize_t trans, bytes_left; |
b2a112ca | 299 | char *buf_st; |
b2a112ca | 300 | |
65f15010 | 301 | bytes_left = nbyte; |
b2a112ca | 302 | buf_st = (char *) buf; |
303 | ||
304 | /* We must write in a loop since some systems don't restart system | |
305 | calls in case of a signal. */ | |
306 | while (bytes_left > 0) | |
4ee9c684 | 307 | { |
65f15010 | 308 | trans = write (s->fd, buf_st, bytes_left); |
b2a112ca | 309 | if (trans < 0) |
310 | { | |
311 | if (errno == EINTR) | |
312 | continue; | |
313 | else | |
65f15010 | 314 | return trans; |
b2a112ca | 315 | } |
316 | buf_st += trans; | |
317 | bytes_left -= trans; | |
4ee9c684 | 318 | } |
319 | ||
65f15010 | 320 | return nbyte - bytes_left; |
4ee9c684 | 321 | } |
4ee9c684 | 322 | |
4dbc0658 | 323 | static gfc_offset |
324 | raw_seek (unix_stream * s, gfc_offset offset, int whence) | |
65f15010 | 325 | { |
326 | return lseek (s->fd, offset, whence); | |
327 | } | |
4ee9c684 | 328 | |
4dbc0658 | 329 | static gfc_offset |
65f15010 | 330 | raw_tell (unix_stream * s) |
331 | { | |
332 | return lseek (s->fd, 0, SEEK_CUR); | |
333 | } | |
4ee9c684 | 334 | |
41178014 | 335 | static gfc_offset |
336 | raw_size (unix_stream * s) | |
337 | { | |
338 | struct stat statbuf; | |
339 | int ret = fstat (s->fd, &statbuf); | |
340 | if (ret == -1) | |
341 | return ret; | |
342 | return statbuf.st_size; | |
343 | } | |
344 | ||
65f15010 | 345 | static int |
4dbc0658 | 346 | raw_truncate (unix_stream * s, gfc_offset length) |
4ee9c684 | 347 | { |
4dbc0658 | 348 | #ifdef __MINGW32__ |
349 | HANDLE h; | |
350 | gfc_offset cur; | |
351 | ||
352 | if (isatty (s->fd)) | |
353 | { | |
354 | errno = EBADF; | |
355 | return -1; | |
356 | } | |
db23ac43 | 357 | h = (HANDLE) _get_osfhandle (s->fd); |
4dbc0658 | 358 | if (h == INVALID_HANDLE_VALUE) |
359 | { | |
360 | errno = EBADF; | |
361 | return -1; | |
362 | } | |
363 | cur = lseek (s->fd, 0, SEEK_CUR); | |
364 | if (cur == -1) | |
365 | return -1; | |
366 | if (lseek (s->fd, length, SEEK_SET) == -1) | |
367 | goto error; | |
368 | if (!SetEndOfFile (h)) | |
369 | { | |
370 | errno = EBADF; | |
371 | goto error; | |
372 | } | |
373 | if (lseek (s->fd, cur, SEEK_SET) == -1) | |
374 | return -1; | |
375 | return 0; | |
376 | error: | |
377 | lseek (s->fd, cur, SEEK_SET); | |
378 | return -1; | |
379 | #elif defined HAVE_FTRUNCATE | |
65f15010 | 380 | return ftruncate (s->fd, length); |
381 | #elif defined HAVE_CHSIZE | |
382 | return chsize (s->fd, length); | |
383 | #else | |
384 | runtime_error ("required ftruncate or chsize support not present"); | |
385 | return -1; | |
386 | #endif | |
4ee9c684 | 387 | } |
388 | ||
65f15010 | 389 | static int |
390 | raw_close (unix_stream * s) | |
391 | { | |
392 | int retval; | |
393 | ||
8b89aa85 | 394 | if (s->fd != STDOUT_FILENO |
395 | && s->fd != STDERR_FILENO | |
396 | && s->fd != STDIN_FILENO) | |
397 | retval = close (s->fd); | |
398 | else | |
6ffeb312 | 399 | retval = 0; |
5e62a3cc | 400 | free (s); |
65f15010 | 401 | return retval; |
402 | } | |
4ee9c684 | 403 | |
292d5498 | 404 | static const struct stream_vtable raw_vtable = { |
405 | .read = (void *) raw_read, | |
406 | .write = (void *) raw_write, | |
407 | .seek = (void *) raw_seek, | |
408 | .tell = (void *) raw_tell, | |
409 | .size = (void *) raw_size, | |
410 | .trunc = (void *) raw_truncate, | |
411 | .close = (void *) raw_close, | |
412 | .flush = (void *) raw_flush | |
413 | }; | |
414 | ||
65f15010 | 415 | static int |
416 | raw_init (unix_stream * s) | |
417 | { | |
292d5498 | 418 | s->st.vptr = &raw_vtable; |
4ee9c684 | 419 | |
65f15010 | 420 | s->buffer = NULL; |
421 | return 0; | |
422 | } | |
b2a112ca | 423 | |
4ee9c684 | 424 | |
65f15010 | 425 | /********************************************************************* |
426 | Buffered I/O functions. These functions have the same semantics as the | |
427 | raw I/O functions above, except that they are buffered in order to | |
428 | improve performance. The buffer must be flushed when switching from | |
cc65b133 | 429 | reading to writing and vice versa. Only supported for regular files. |
65f15010 | 430 | *********************************************************************/ |
431 | ||
432 | static int | |
433 | buf_flush (unix_stream * s) | |
4ee9c684 | 434 | { |
65f15010 | 435 | int writelen; |
436 | ||
437 | /* Flushing in read mode means discarding read bytes. */ | |
438 | s->active = 0; | |
b2a112ca | 439 | |
4ee9c684 | 440 | if (s->ndirty == 0) |
65f15010 | 441 | return 0; |
352597f9 | 442 | |
cc65b133 | 443 | if (s->physical_offset != s->buffer_offset |
65f15010 | 444 | && lseek (s->fd, s->buffer_offset, SEEK_SET) < 0) |
445 | return -1; | |
4ee9c684 | 446 | |
65f15010 | 447 | writelen = raw_write (s, s->buffer, s->ndirty); |
4ee9c684 | 448 | |
65f15010 | 449 | s->physical_offset = s->buffer_offset + writelen; |
5a78b88f | 450 | |
cc65b133 | 451 | if (s->physical_offset > s->file_length) |
65f15010 | 452 | s->file_length = s->physical_offset; |
b2a112ca | 453 | |
454 | s->ndirty -= writelen; | |
455 | if (s->ndirty != 0) | |
65f15010 | 456 | return -1; |
4ee9c684 | 457 | |
65f15010 | 458 | return 0; |
4ee9c684 | 459 | } |
460 | ||
65f15010 | 461 | static ssize_t |
462 | buf_read (unix_stream * s, void * buf, ssize_t nbyte) | |
4ee9c684 | 463 | { |
65f15010 | 464 | if (s->active == 0) |
465 | s->buffer_offset = s->logical_offset; | |
5d5f00d5 | 466 | |
65f15010 | 467 | /* Is the data we want in the buffer? */ |
468 | if (s->logical_offset + nbyte <= s->buffer_offset + s->active | |
469 | && s->buffer_offset <= s->logical_offset) | |
470 | memcpy (buf, s->buffer + (s->logical_offset - s->buffer_offset), nbyte); | |
5d5f00d5 | 471 | else |
472 | { | |
65f15010 | 473 | /* First copy the active bytes if applicable, then read the rest |
474 | either directly or filling the buffer. */ | |
475 | char *p; | |
476 | int nread = 0; | |
477 | ssize_t to_read, did_read; | |
478 | gfc_offset new_logical; | |
479 | ||
480 | p = (char *) buf; | |
481 | if (s->logical_offset >= s->buffer_offset | |
482 | && s->buffer_offset + s->active >= s->logical_offset) | |
483 | { | |
484 | nread = s->active - (s->logical_offset - s->buffer_offset); | |
485 | memcpy (buf, s->buffer + (s->logical_offset - s->buffer_offset), | |
486 | nread); | |
487 | p += nread; | |
488 | } | |
489 | /* At this point we consider all bytes in the buffer discarded. */ | |
490 | to_read = nbyte - nread; | |
491 | new_logical = s->logical_offset + nread; | |
cc65b133 | 492 | if (s->physical_offset != new_logical |
65f15010 | 493 | && lseek (s->fd, new_logical, SEEK_SET) < 0) |
494 | return -1; | |
495 | s->buffer_offset = s->physical_offset = new_logical; | |
496 | if (to_read <= BUFFER_SIZE/2) | |
497 | { | |
498 | did_read = raw_read (s, s->buffer, BUFFER_SIZE); | |
499 | s->physical_offset += did_read; | |
500 | s->active = did_read; | |
501 | did_read = (did_read > to_read) ? to_read : did_read; | |
502 | memcpy (p, s->buffer, did_read); | |
503 | } | |
504 | else | |
505 | { | |
506 | did_read = raw_read (s, p, to_read); | |
507 | s->physical_offset += did_read; | |
508 | s->active = 0; | |
509 | } | |
510 | nbyte = did_read + nread; | |
4ee9c684 | 511 | } |
65f15010 | 512 | s->logical_offset += nbyte; |
513 | return nbyte; | |
4ee9c684 | 514 | } |
515 | ||
65f15010 | 516 | static ssize_t |
517 | buf_write (unix_stream * s, const void * buf, ssize_t nbyte) | |
4ee9c684 | 518 | { |
65f15010 | 519 | if (s->ndirty == 0) |
520 | s->buffer_offset = s->logical_offset; | |
521 | ||
522 | /* Does the data fit into the buffer? As a special case, if the | |
523 | buffer is empty and the request is bigger than BUFFER_SIZE/2, | |
524 | write directly. This avoids the case where the buffer would have | |
525 | to be flushed at every write. */ | |
526 | if (!(s->ndirty == 0 && nbyte > BUFFER_SIZE/2) | |
527 | && s->logical_offset + nbyte <= s->buffer_offset + BUFFER_SIZE | |
528 | && s->buffer_offset <= s->logical_offset | |
529 | && s->buffer_offset + s->ndirty >= s->logical_offset) | |
fef3501c | 530 | { |
65f15010 | 531 | memcpy (s->buffer + (s->logical_offset - s->buffer_offset), buf, nbyte); |
532 | int nd = (s->logical_offset - s->buffer_offset) + nbyte; | |
533 | if (nd > s->ndirty) | |
534 | s->ndirty = nd; | |
fef3501c | 535 | } |
536 | else | |
537 | { | |
65f15010 | 538 | /* Flush, and either fill the buffer with the new data, or if |
539 | the request is bigger than the buffer size, write directly | |
540 | bypassing the buffer. */ | |
541 | buf_flush (s); | |
542 | if (nbyte <= BUFFER_SIZE/2) | |
543 | { | |
544 | memcpy (s->buffer, buf, nbyte); | |
545 | s->buffer_offset = s->logical_offset; | |
546 | s->ndirty += nbyte; | |
547 | } | |
548 | else | |
35a97371 | 549 | { |
cc65b133 | 550 | if (s->physical_offset != s->logical_offset) |
35a97371 | 551 | { |
552 | if (lseek (s->fd, s->logical_offset, SEEK_SET) < 0) | |
553 | return -1; | |
554 | s->physical_offset = s->logical_offset; | |
555 | } | |
556 | ||
557 | nbyte = raw_write (s, buf, nbyte); | |
558 | s->physical_offset += nbyte; | |
559 | } | |
4ee9c684 | 560 | } |
65f15010 | 561 | s->logical_offset += nbyte; |
cc65b133 | 562 | if (s->logical_offset > s->file_length) |
65f15010 | 563 | s->file_length = s->logical_offset; |
564 | return nbyte; | |
4ee9c684 | 565 | } |
566 | ||
4dbc0658 | 567 | static gfc_offset |
568 | buf_seek (unix_stream * s, gfc_offset offset, int whence) | |
4ee9c684 | 569 | { |
65f15010 | 570 | switch (whence) |
352597f9 | 571 | { |
65f15010 | 572 | case SEEK_SET: |
573 | break; | |
574 | case SEEK_CUR: | |
575 | offset += s->logical_offset; | |
576 | break; | |
577 | case SEEK_END: | |
578 | offset += s->file_length; | |
579 | break; | |
580 | default: | |
581 | return -1; | |
352597f9 | 582 | } |
65f15010 | 583 | if (offset < 0) |
72909c79 | 584 | { |
65f15010 | 585 | errno = EINVAL; |
586 | return -1; | |
72909c79 | 587 | } |
65f15010 | 588 | s->logical_offset = offset; |
589 | return offset; | |
4ee9c684 | 590 | } |
591 | ||
4dbc0658 | 592 | static gfc_offset |
65f15010 | 593 | buf_tell (unix_stream * s) |
56f281a2 | 594 | { |
f22f0b38 | 595 | return buf_seek (s, 0, SEEK_CUR); |
56f281a2 | 596 | } |
b2a112ca | 597 | |
41178014 | 598 | static gfc_offset |
599 | buf_size (unix_stream * s) | |
600 | { | |
601 | return s->file_length; | |
602 | } | |
603 | ||
b2a112ca | 604 | static int |
4dbc0658 | 605 | buf_truncate (unix_stream * s, gfc_offset length) |
b2a112ca | 606 | { |
65f15010 | 607 | int r; |
b2a112ca | 608 | |
65f15010 | 609 | if (buf_flush (s) != 0) |
610 | return -1; | |
611 | r = raw_truncate (s, length); | |
612 | if (r == 0) | |
613 | s->file_length = length; | |
614 | return r; | |
b2a112ca | 615 | } |
616 | ||
b2a112ca | 617 | static int |
65f15010 | 618 | buf_close (unix_stream * s) |
4ee9c684 | 619 | { |
65f15010 | 620 | if (buf_flush (s) != 0) |
621 | return -1; | |
5e62a3cc | 622 | free (s->buffer); |
65f15010 | 623 | return raw_close (s); |
4ee9c684 | 624 | } |
625 | ||
292d5498 | 626 | static const struct stream_vtable buf_vtable = { |
627 | .read = (void *) buf_read, | |
628 | .write = (void *) buf_write, | |
629 | .seek = (void *) buf_seek, | |
630 | .tell = (void *) buf_tell, | |
631 | .size = (void *) buf_size, | |
632 | .trunc = (void *) buf_truncate, | |
633 | .close = (void *) buf_close, | |
634 | .flush = (void *) buf_flush | |
635 | }; | |
636 | ||
65f15010 | 637 | static int |
638 | buf_init (unix_stream * s) | |
4ee9c684 | 639 | { |
292d5498 | 640 | s->st.vptr = &buf_vtable; |
4ee9c684 | 641 | |
25c067ae | 642 | s->buffer = xmalloc (BUFFER_SIZE); |
65f15010 | 643 | return 0; |
4ee9c684 | 644 | } |
645 | ||
646 | ||
4ee9c684 | 647 | /********************************************************************* |
648 | memory stream functions - These are used for internal files | |
649 | ||
650 | The idea here is that a single stream structure is created and all | |
651 | requests must be satisfied from it. The location and size of the | |
652 | buffer is the character variable supplied to the READ or WRITE | |
653 | statement. | |
654 | ||
655 | *********************************************************************/ | |
656 | ||
65f15010 | 657 | char * |
658 | mem_alloc_r (stream * strm, int * len) | |
4ee9c684 | 659 | { |
65f15010 | 660 | unix_stream * s = (unix_stream *) strm; |
b093181d | 661 | gfc_offset n; |
d875179d | 662 | gfc_offset where = s->logical_offset; |
4ee9c684 | 663 | |
664 | if (where < s->buffer_offset || where > s->buffer_offset + s->active) | |
665 | return NULL; | |
666 | ||
11de4bf9 | 667 | n = s->buffer_offset + s->active - where; |
4ee9c684 | 668 | if (*len > n) |
669 | *len = n; | |
670 | ||
65f15010 | 671 | s->logical_offset = where + *len; |
672 | ||
4ee9c684 | 673 | return s->buffer + (where - s->buffer_offset); |
674 | } | |
675 | ||
676 | ||
e0aaacb7 | 677 | char * |
678 | mem_alloc_r4 (stream * strm, int * len) | |
679 | { | |
680 | unix_stream * s = (unix_stream *) strm; | |
681 | gfc_offset n; | |
682 | gfc_offset where = s->logical_offset; | |
683 | ||
684 | if (where < s->buffer_offset || where > s->buffer_offset + s->active) | |
685 | return NULL; | |
686 | ||
687 | n = s->buffer_offset + s->active - where; | |
688 | if (*len > n) | |
689 | *len = n; | |
690 | ||
691 | s->logical_offset = where + *len; | |
692 | ||
693 | return s->buffer + (where - s->buffer_offset) * 4; | |
694 | } | |
695 | ||
696 | ||
65f15010 | 697 | char * |
698 | mem_alloc_w (stream * strm, int * len) | |
4ee9c684 | 699 | { |
65f15010 | 700 | unix_stream * s = (unix_stream *) strm; |
b093181d | 701 | gfc_offset m; |
d875179d | 702 | gfc_offset where = s->logical_offset; |
4ee9c684 | 703 | |
4ee9c684 | 704 | m = where + *len; |
705 | ||
2639e4cd | 706 | if (where < s->buffer_offset) |
4ee9c684 | 707 | return NULL; |
708 | ||
2639e4cd | 709 | if (m > s->file_length) |
72231bd6 | 710 | return NULL; |
2639e4cd | 711 | |
4ee9c684 | 712 | s->logical_offset = m; |
713 | ||
714 | return s->buffer + (where - s->buffer_offset); | |
715 | } | |
716 | ||
717 | ||
1bb7bffb | 718 | gfc_char4_t * |
e0aaacb7 | 719 | mem_alloc_w4 (stream * strm, int * len) |
720 | { | |
721 | unix_stream * s = (unix_stream *) strm; | |
722 | gfc_offset m; | |
723 | gfc_offset where = s->logical_offset; | |
1bb7bffb | 724 | gfc_char4_t *result = (gfc_char4_t *) s->buffer; |
e0aaacb7 | 725 | |
726 | m = where + *len; | |
727 | ||
728 | if (where < s->buffer_offset) | |
729 | return NULL; | |
730 | ||
731 | if (m > s->file_length) | |
732 | return NULL; | |
733 | ||
734 | s->logical_offset = m; | |
1bb7bffb | 735 | return &result[where - s->buffer_offset]; |
e0aaacb7 | 736 | } |
737 | ||
738 | ||
739 | /* Stream read function for character(kine=1) internal units. */ | |
b2a112ca | 740 | |
65f15010 | 741 | static ssize_t |
742 | mem_read (stream * s, void * buf, ssize_t nbytes) | |
b2a112ca | 743 | { |
744 | void *p; | |
65f15010 | 745 | int nb = nbytes; |
b2a112ca | 746 | |
65f15010 | 747 | p = mem_alloc_r (s, &nb); |
b2a112ca | 748 | if (p) |
749 | { | |
65f15010 | 750 | memcpy (buf, p, nb); |
751 | return (ssize_t) nb; | |
b2a112ca | 752 | } |
753 | else | |
65f15010 | 754 | return 0; |
b2a112ca | 755 | } |
756 | ||
757 | ||
e0aaacb7 | 758 | /* Stream read function for chracter(kind=4) internal units. */ |
759 | ||
760 | static ssize_t | |
761 | mem_read4 (stream * s, void * buf, ssize_t nbytes) | |
762 | { | |
763 | void *p; | |
764 | int nb = nbytes; | |
765 | ||
766 | p = mem_alloc_r (s, &nb); | |
767 | if (p) | |
768 | { | |
769 | memcpy (buf, p, nb); | |
770 | return (ssize_t) nb; | |
771 | } | |
772 | else | |
773 | return 0; | |
774 | } | |
775 | ||
776 | ||
777 | /* Stream write function for character(kind=1) internal units. */ | |
b2a112ca | 778 | |
65f15010 | 779 | static ssize_t |
780 | mem_write (stream * s, const void * buf, ssize_t nbytes) | |
b2a112ca | 781 | { |
782 | void *p; | |
65f15010 | 783 | int nb = nbytes; |
b2a112ca | 784 | |
65f15010 | 785 | p = mem_alloc_w (s, &nb); |
b2a112ca | 786 | if (p) |
787 | { | |
65f15010 | 788 | memcpy (p, buf, nb); |
789 | return (ssize_t) nb; | |
b2a112ca | 790 | } |
791 | else | |
65f15010 | 792 | return 0; |
b2a112ca | 793 | } |
794 | ||
795 | ||
e0aaacb7 | 796 | /* Stream write function for character(kind=4) internal units. */ |
797 | ||
798 | static ssize_t | |
799 | mem_write4 (stream * s, const void * buf, ssize_t nwords) | |
800 | { | |
801 | gfc_char4_t *p; | |
802 | int nw = nwords; | |
803 | ||
1bb7bffb | 804 | p = mem_alloc_w4 (s, &nw); |
e0aaacb7 | 805 | if (p) |
806 | { | |
807 | while (nw--) | |
808 | *p++ = (gfc_char4_t) *((char *) buf); | |
809 | return nwords; | |
810 | } | |
811 | else | |
812 | return 0; | |
813 | } | |
814 | ||
815 | ||
4dbc0658 | 816 | static gfc_offset |
817 | mem_seek (stream * strm, gfc_offset offset, int whence) | |
4ee9c684 | 818 | { |
65f15010 | 819 | unix_stream * s = (unix_stream *) strm; |
820 | switch (whence) | |
821 | { | |
822 | case SEEK_SET: | |
823 | break; | |
824 | case SEEK_CUR: | |
825 | offset += s->logical_offset; | |
826 | break; | |
827 | case SEEK_END: | |
828 | offset += s->file_length; | |
829 | break; | |
830 | default: | |
831 | return -1; | |
832 | } | |
833 | ||
834 | /* Note that for internal array I/O it's actually possible to have a | |
835 | negative offset, so don't check for that. */ | |
4ee9c684 | 836 | if (offset > s->file_length) |
837 | { | |
65f15010 | 838 | errno = EINVAL; |
839 | return -1; | |
4ee9c684 | 840 | } |
841 | ||
842 | s->logical_offset = offset; | |
65f15010 | 843 | |
844 | /* Returning < 0 is the error indicator for sseek(), so return 0 if | |
845 | offset is negative. Thus if the return value is 0, the caller | |
846 | has to use stell() to get the real value of logical_offset. */ | |
847 | if (offset >= 0) | |
848 | return offset; | |
849 | return 0; | |
4ee9c684 | 850 | } |
851 | ||
852 | ||
4dbc0658 | 853 | static gfc_offset |
65f15010 | 854 | mem_tell (stream * s) |
56f281a2 | 855 | { |
65f15010 | 856 | return ((unix_stream *)s)->logical_offset; |
56f281a2 | 857 | } |
858 | ||
859 | ||
4ee9c684 | 860 | static int |
65f15010 | 861 | mem_truncate (unix_stream * s __attribute__ ((unused)), |
4dbc0658 | 862 | gfc_offset length __attribute__ ((unused))) |
4ee9c684 | 863 | { |
65f15010 | 864 | return 0; |
4ee9c684 | 865 | } |
866 | ||
867 | ||
65f15010 | 868 | static int |
869 | mem_flush (unix_stream * s __attribute__ ((unused))) | |
4ee9c684 | 870 | { |
65f15010 | 871 | return 0; |
4ee9c684 | 872 | } |
873 | ||
874 | ||
65f15010 | 875 | static int |
876 | mem_close (unix_stream * s) | |
4ee9c684 | 877 | { |
dd045aee | 878 | free (s); |
4ee9c684 | 879 | |
65f15010 | 880 | return 0; |
881 | } | |
4ee9c684 | 882 | |
292d5498 | 883 | static const struct stream_vtable mem_vtable = { |
884 | .read = (void *) mem_read, | |
885 | .write = (void *) mem_write, | |
886 | .seek = (void *) mem_seek, | |
887 | .tell = (void *) mem_tell, | |
888 | /* buf_size is not a typo, we just reuse an identical | |
889 | implementation. */ | |
890 | .size = (void *) buf_size, | |
891 | .trunc = (void *) mem_truncate, | |
892 | .close = (void *) mem_close, | |
893 | .flush = (void *) mem_flush | |
894 | }; | |
895 | ||
896 | static const struct stream_vtable mem4_vtable = { | |
897 | .read = (void *) mem_read4, | |
898 | .write = (void *) mem_write4, | |
899 | .seek = (void *) mem_seek, | |
900 | .tell = (void *) mem_tell, | |
901 | /* buf_size is not a typo, we just reuse an identical | |
902 | implementation. */ | |
903 | .size = (void *) buf_size, | |
904 | .trunc = (void *) mem_truncate, | |
905 | .close = (void *) mem_close, | |
906 | .flush = (void *) mem_flush | |
907 | }; | |
4ee9c684 | 908 | |
909 | /********************************************************************* | |
910 | Public functions -- A reimplementation of this module needs to | |
911 | define functional equivalents of the following. | |
912 | *********************************************************************/ | |
913 | ||
e0aaacb7 | 914 | /* open_internal()-- Returns a stream structure from a character(kind=1) |
915 | internal file */ | |
4ee9c684 | 916 | |
917 | stream * | |
cf4abc57 | 918 | open_internal (char *base, int length, gfc_offset offset) |
4ee9c684 | 919 | { |
65f15010 | 920 | unix_stream *s; |
4ee9c684 | 921 | |
33123ed7 | 922 | s = xcalloc (1, sizeof (unix_stream)); |
4ee9c684 | 923 | |
924 | s->buffer = base; | |
cf4abc57 | 925 | s->buffer_offset = offset; |
4ee9c684 | 926 | |
4ee9c684 | 927 | s->active = s->file_length = length; |
928 | ||
292d5498 | 929 | s->st.vptr = &mem_vtable; |
4ee9c684 | 930 | |
e0aaacb7 | 931 | return (stream *) s; |
932 | } | |
933 | ||
934 | /* open_internal4()-- Returns a stream structure from a character(kind=4) | |
935 | internal file */ | |
936 | ||
937 | stream * | |
938 | open_internal4 (char *base, int length, gfc_offset offset) | |
939 | { | |
940 | unix_stream *s; | |
941 | ||
33123ed7 | 942 | s = xcalloc (1, sizeof (unix_stream)); |
e0aaacb7 | 943 | |
944 | s->buffer = base; | |
945 | s->buffer_offset = offset; | |
946 | ||
e0aaacb7 | 947 | s->active = s->file_length = length; |
948 | ||
292d5498 | 949 | s->st.vptr = &mem4_vtable; |
e0aaacb7 | 950 | |
4ee9c684 | 951 | return (stream *) s; |
952 | } | |
953 | ||
954 | ||
955 | /* fd_to_stream()-- Given an open file descriptor, build a stream | |
956 | * around it. */ | |
957 | ||
958 | static stream * | |
aadbd4ae | 959 | fd_to_stream (int fd) |
4ee9c684 | 960 | { |
f6854450 | 961 | struct stat statbuf; |
4ee9c684 | 962 | unix_stream *s; |
963 | ||
33123ed7 | 964 | s = xcalloc (1, sizeof (unix_stream)); |
4ee9c684 | 965 | |
966 | s->fd = fd; | |
4ee9c684 | 967 | |
968 | /* Get the current length of the file. */ | |
969 | ||
970 | fstat (fd, &statbuf); | |
352597f9 | 971 | |
01cd2c93 | 972 | s->st_dev = statbuf.st_dev; |
973 | s->st_ino = statbuf.st_ino; | |
cc65b133 | 974 | s->file_length = statbuf.st_size; |
975 | ||
976 | /* Only use buffered IO for regular files. */ | |
977 | if (S_ISREG (statbuf.st_mode) | |
978 | && !options.all_unbuffered | |
979 | && !(options.unbuffered_preconnected && | |
980 | (s->fd == STDIN_FILENO | |
981 | || s->fd == STDOUT_FILENO | |
982 | || s->fd == STDERR_FILENO))) | |
983 | buf_init (s); | |
9bfd25a7 | 984 | else |
65f15010 | 985 | raw_init (s); |
4ee9c684 | 986 | |
987 | return (stream *) s; | |
988 | } | |
989 | ||
990 | ||
771c1b50 | 991 | /* Given the Fortran unit number, convert it to a C file descriptor. */ |
992 | ||
993 | int | |
60c514ba | 994 | unit_to_fd (int unit) |
771c1b50 | 995 | { |
771c1b50 | 996 | gfc_unit *us; |
60c514ba | 997 | int fd; |
771c1b50 | 998 | |
60c514ba | 999 | us = find_unit (unit); |
771c1b50 | 1000 | if (us == NULL) |
1001 | return -1; | |
1002 | ||
60c514ba | 1003 | fd = ((unix_stream *) us->s)->fd; |
1004 | unlock_unit (us); | |
1005 | return fd; | |
771c1b50 | 1006 | } |
1007 | ||
1008 | ||
4ee9c684 | 1009 | /* unpack_filename()-- Given a fortran string and a pointer to a |
1010 | * buffer that is PATH_MAX characters, convert the fortran string to a | |
1011 | * C string in the buffer. Returns nonzero if this is not possible. */ | |
1012 | ||
1dc95e51 | 1013 | int |
4ee9c684 | 1014 | unpack_filename (char *cstring, const char *fstring, int len) |
1015 | { | |
d6e40722 | 1016 | if (fstring == NULL) |
de28dd31 | 1017 | return EFAULT; |
4ee9c684 | 1018 | len = fstrlen (fstring, len); |
1019 | if (len >= PATH_MAX) | |
de28dd31 | 1020 | return ENAMETOOLONG; |
4ee9c684 | 1021 | |
1022 | memmove (cstring, fstring, len); | |
1023 | cstring[len] = '\0'; | |
1024 | ||
1025 | return 0; | |
1026 | } | |
1027 | ||
1028 | ||
1029 | /* tempfile()-- Generate a temporary filename for a scratch file and | |
1030 | * open it. mkstemp() opens the file for reading and writing, but the | |
1031 | * library mode prevents anything that is not allowed. The descriptor | |
7dfba97b | 1032 | * is returned, which is -1 on error. The template is pointed to by |
60c514ba | 1033 | * opp->file, which is copied into the unit structure |
4ee9c684 | 1034 | * and freed later. */ |
1035 | ||
1036 | static int | |
60c514ba | 1037 | tempfile (st_parameter_open *opp) |
4ee9c684 | 1038 | { |
1039 | const char *tempdir; | |
1040 | char *template; | |
db23ac43 | 1041 | const char *slash = "/"; |
4ee9c684 | 1042 | int fd; |
d06c5aaa | 1043 | size_t tempdirlen; |
1044 | ||
1045 | #ifndef HAVE_MKSTEMP | |
1046 | int count; | |
1047 | size_t slashlen; | |
1048 | #endif | |
4ee9c684 | 1049 | |
1050 | tempdir = getenv ("GFORTRAN_TMPDIR"); | |
db23ac43 | 1051 | #ifdef __MINGW32__ |
1052 | if (tempdir == NULL) | |
1053 | { | |
1054 | char buffer[MAX_PATH + 1]; | |
1055 | DWORD ret; | |
1056 | ret = GetTempPath (MAX_PATH, buffer); | |
1057 | /* If we are not able to get a temp-directory, we use | |
1058 | current directory. */ | |
1059 | if (ret > MAX_PATH || !ret) | |
1060 | buffer[0] = 0; | |
1061 | else | |
1062 | buffer[ret] = 0; | |
1063 | tempdir = strdup (buffer); | |
1064 | } | |
1065 | #else | |
4ee9c684 | 1066 | if (tempdir == NULL) |
1067 | tempdir = getenv ("TMP"); | |
ac09d5cc | 1068 | if (tempdir == NULL) |
1069 | tempdir = getenv ("TEMP"); | |
4ee9c684 | 1070 | if (tempdir == NULL) |
1071 | tempdir = DEFAULT_TEMPDIR; | |
db23ac43 | 1072 | #endif |
d06c5aaa | 1073 | |
db23ac43 | 1074 | /* Check for special case that tempdir contains slash |
1075 | or backslash at end. */ | |
d06c5aaa | 1076 | tempdirlen = strlen (tempdir); |
1077 | if (*tempdir == 0 || tempdir[tempdirlen - 1] == '/' | |
db23ac43 | 1078 | #ifdef __MINGW32__ |
d06c5aaa | 1079 | || tempdir[tempdirlen - 1] == '\\' |
db23ac43 | 1080 | #endif |
1081 | ) | |
1082 | slash = ""; | |
4ee9c684 | 1083 | |
d06c5aaa | 1084 | // Take care that the template is longer in the mktemp() branch. |
25c067ae | 1085 | template = xmalloc (tempdirlen + 23); |
4ee9c684 | 1086 | |
7dfba97b | 1087 | #ifdef HAVE_MKSTEMP |
d151c82c | 1088 | snprintf (template, tempdirlen + 23, "%s%sgfortrantmpXXXXXX", |
1089 | tempdir, slash); | |
4ee9c684 | 1090 | |
1091 | fd = mkstemp (template); | |
1092 | ||
7dfba97b | 1093 | #else /* HAVE_MKSTEMP */ |
726fd258 | 1094 | fd = -1; |
d06c5aaa | 1095 | count = 0; |
1096 | slashlen = strlen (slash); | |
726fd258 | 1097 | do |
1098 | { | |
d151c82c | 1099 | snprintf (template, tempdirlen + 23, "%s%sgfortrantmpaaaXXXXXX", |
1100 | tempdir, slash); | |
d06c5aaa | 1101 | if (count > 0) |
1102 | { | |
1103 | int c = count; | |
1104 | template[tempdirlen + slashlen + 13] = 'a' + (c% 26); | |
1105 | c /= 26; | |
1106 | template[tempdirlen + slashlen + 12] = 'a' + (c % 26); | |
1107 | c /= 26; | |
1108 | template[tempdirlen + slashlen + 11] = 'a' + (c % 26); | |
1109 | if (c >= 26) | |
1110 | break; | |
1111 | } | |
1112 | ||
726fd258 | 1113 | if (!mktemp (template)) |
d06c5aaa | 1114 | { |
1115 | errno = EEXIST; | |
1116 | count++; | |
1117 | continue; | |
1118 | } | |
1119 | ||
cf6a3896 | 1120 | #if defined(HAVE_CRLF) && defined(O_BINARY) |
cf55c3cf | 1121 | fd = open (template, O_RDWR | O_CREAT | O_EXCL | O_BINARY, |
ec55604a | 1122 | S_IRUSR | S_IWUSR); |
cf55c3cf | 1123 | #else |
ec55604a | 1124 | fd = open (template, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR); |
cf55c3cf | 1125 | #endif |
726fd258 | 1126 | } |
1127 | while (fd == -1 && errno == EEXIST); | |
7dfba97b | 1128 | #endif /* HAVE_MKSTEMP */ |
1129 | ||
e213d8e0 | 1130 | opp->file = template; |
1131 | opp->file_len = strlen (template); /* Don't include trailing nul */ | |
4ee9c684 | 1132 | |
1133 | return fd; | |
1134 | } | |
1135 | ||
1136 | ||
6d12c489 | 1137 | /* regular_file()-- Open a regular file. |
2d6ba0f9 | 1138 | * Change flags->action if it is ACTION_UNSPECIFIED on entry, |
1139 | * unless an error occurs. | |
6d12c489 | 1140 | * Returns the descriptor, which is less than zero on error. */ |
4ee9c684 | 1141 | |
1142 | static int | |
60c514ba | 1143 | regular_file (st_parameter_open *opp, unit_flags *flags) |
4ee9c684 | 1144 | { |
de28dd31 | 1145 | char path[min(PATH_MAX, opp->file_len + 1)]; |
4ee9c684 | 1146 | int mode; |
6d12c489 | 1147 | int rwflag; |
2d6ba0f9 | 1148 | int crflag; |
6d12c489 | 1149 | int fd; |
de28dd31 | 1150 | int err; |
4ee9c684 | 1151 | |
de28dd31 | 1152 | err = unpack_filename (path, opp->file, opp->file_len); |
1153 | if (err) | |
4ee9c684 | 1154 | { |
de28dd31 | 1155 | errno = err; /* Fake an OS error */ |
4ee9c684 | 1156 | return -1; |
1157 | } | |
1158 | ||
3d17984e | 1159 | #ifdef __CYGWIN__ |
1160 | if (opp->file_len == 7) | |
1161 | { | |
1162 | if (strncmp (path, "CONOUT$", 7) == 0 | |
1163 | || strncmp (path, "CONERR$", 7) == 0) | |
1164 | { | |
1165 | fd = open ("/dev/conout", O_WRONLY); | |
1166 | flags->action = ACTION_WRITE; | |
1167 | return fd; | |
1168 | } | |
1169 | } | |
1170 | ||
1171 | if (opp->file_len == 6 && strncmp (path, "CONIN$", 6) == 0) | |
1172 | { | |
1173 | fd = open ("/dev/conin", O_RDONLY); | |
1174 | flags->action = ACTION_READ; | |
1175 | return fd; | |
1176 | } | |
1177 | #endif | |
1178 | ||
2058bc7e | 1179 | |
1180 | #ifdef __MINGW32__ | |
1181 | if (opp->file_len == 7) | |
1182 | { | |
1183 | if (strncmp (path, "CONOUT$", 7) == 0 | |
1184 | || strncmp (path, "CONERR$", 7) == 0) | |
1185 | { | |
1186 | fd = open ("CONOUT$", O_WRONLY); | |
1187 | flags->action = ACTION_WRITE; | |
1188 | return fd; | |
1189 | } | |
1190 | } | |
1191 | ||
1192 | if (opp->file_len == 6 && strncmp (path, "CONIN$", 6) == 0) | |
1193 | { | |
1194 | fd = open ("CONIN$", O_RDONLY); | |
1195 | flags->action = ACTION_READ; | |
1196 | return fd; | |
1197 | } | |
1198 | #endif | |
1199 | ||
6d12c489 | 1200 | rwflag = 0; |
4ee9c684 | 1201 | |
6d12c489 | 1202 | switch (flags->action) |
4ee9c684 | 1203 | { |
1204 | case ACTION_READ: | |
6d12c489 | 1205 | rwflag = O_RDONLY; |
4ee9c684 | 1206 | break; |
1207 | ||
1208 | case ACTION_WRITE: | |
6d12c489 | 1209 | rwflag = O_WRONLY; |
4ee9c684 | 1210 | break; |
1211 | ||
1212 | case ACTION_READWRITE: | |
6d12c489 | 1213 | case ACTION_UNSPECIFIED: |
1214 | rwflag = O_RDWR; | |
4ee9c684 | 1215 | break; |
1216 | ||
1217 | default: | |
60c514ba | 1218 | internal_error (&opp->common, "regular_file(): Bad action"); |
4ee9c684 | 1219 | } |
1220 | ||
6d12c489 | 1221 | switch (flags->status) |
4ee9c684 | 1222 | { |
1223 | case STATUS_NEW: | |
2d6ba0f9 | 1224 | crflag = O_CREAT | O_EXCL; |
4ee9c684 | 1225 | break; |
1226 | ||
2d6ba0f9 | 1227 | case STATUS_OLD: /* open will fail if the file does not exist*/ |
1228 | crflag = 0; | |
4ee9c684 | 1229 | break; |
1230 | ||
1231 | case STATUS_UNKNOWN: | |
1232 | case STATUS_SCRATCH: | |
2d6ba0f9 | 1233 | crflag = O_CREAT; |
4ee9c684 | 1234 | break; |
1235 | ||
1236 | case STATUS_REPLACE: | |
a638be8f | 1237 | crflag = O_CREAT | O_TRUNC; |
4ee9c684 | 1238 | break; |
1239 | ||
1240 | default: | |
60c514ba | 1241 | internal_error (&opp->common, "regular_file(): Bad status"); |
4ee9c684 | 1242 | } |
1243 | ||
6d12c489 | 1244 | /* rwflag |= O_LARGEFILE; */ |
4ee9c684 | 1245 | |
cf6a3896 | 1246 | #if defined(HAVE_CRLF) && defined(O_BINARY) |
cf55c3cf | 1247 | crflag |= O_BINARY; |
1248 | #endif | |
1249 | ||
6d12c489 | 1250 | mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH; |
2d6ba0f9 | 1251 | fd = open (path, rwflag | crflag, mode); |
1252 | if (flags->action != ACTION_UNSPECIFIED) | |
a638be8f | 1253 | return fd; |
2d6ba0f9 | 1254 | |
1255 | if (fd >= 0) | |
6d12c489 | 1256 | { |
2d6ba0f9 | 1257 | flags->action = ACTION_READWRITE; |
1258 | return fd; | |
6d12c489 | 1259 | } |
a638be8f | 1260 | if (errno != EACCES && errno != EROFS) |
2d6ba0f9 | 1261 | return fd; |
1262 | ||
1263 | /* retry for read-only access */ | |
1264 | rwflag = O_RDONLY; | |
1265 | fd = open (path, rwflag | crflag, mode); | |
1266 | if (fd >=0) | |
1267 | { | |
1268 | flags->action = ACTION_READ; | |
84d33b91 | 1269 | return fd; /* success */ |
2d6ba0f9 | 1270 | } |
1271 | ||
1272 | if (errno != EACCES) | |
84d33b91 | 1273 | return fd; /* failure */ |
2d6ba0f9 | 1274 | |
1275 | /* retry for write-only access */ | |
1276 | rwflag = O_WRONLY; | |
1277 | fd = open (path, rwflag | crflag, mode); | |
1278 | if (fd >=0) | |
1279 | { | |
1280 | flags->action = ACTION_WRITE; | |
84d33b91 | 1281 | return fd; /* success */ |
2d6ba0f9 | 1282 | } |
84d33b91 | 1283 | return fd; /* failure */ |
4ee9c684 | 1284 | } |
1285 | ||
1286 | ||
1287 | /* open_external()-- Open an external file, unix specific version. | |
6d12c489 | 1288 | * Change flags->action if it is ACTION_UNSPECIFIED on entry. |
4ee9c684 | 1289 | * Returns NULL on operating system error. */ |
1290 | ||
1291 | stream * | |
60c514ba | 1292 | open_external (st_parameter_open *opp, unit_flags *flags) |
4ee9c684 | 1293 | { |
aadbd4ae | 1294 | int fd; |
4ee9c684 | 1295 | |
6d12c489 | 1296 | if (flags->status == STATUS_SCRATCH) |
1297 | { | |
60c514ba | 1298 | fd = tempfile (opp); |
6d12c489 | 1299 | if (flags->action == ACTION_UNSPECIFIED) |
84d33b91 | 1300 | flags->action = ACTION_READWRITE; |
1dc95e51 | 1301 | |
1302 | #if HAVE_UNLINK_OPEN_FILE | |
6d12c489 | 1303 | /* We can unlink scratch files now and it will go away when closed. */ |
60c514ba | 1304 | if (fd >= 0) |
1305 | unlink (opp->file); | |
1dc95e51 | 1306 | #endif |
6d12c489 | 1307 | } |
1308 | else | |
1309 | { | |
2d6ba0f9 | 1310 | /* regular_file resets flags->action if it is ACTION_UNSPECIFIED and |
1311 | * if it succeeds */ | |
60c514ba | 1312 | fd = regular_file (opp, flags); |
6d12c489 | 1313 | } |
4ee9c684 | 1314 | |
1315 | if (fd < 0) | |
1316 | return NULL; | |
1317 | fd = fix_fd (fd); | |
1318 | ||
aadbd4ae | 1319 | return fd_to_stream (fd); |
4ee9c684 | 1320 | } |
1321 | ||
1322 | ||
1323 | /* input_stream()-- Return a stream pointer to the default input stream. | |
1324 | * Called on initialization. */ | |
1325 | ||
1326 | stream * | |
1327 | input_stream (void) | |
1328 | { | |
aadbd4ae | 1329 | return fd_to_stream (STDIN_FILENO); |
4ee9c684 | 1330 | } |
1331 | ||
1332 | ||
ff81ee3b | 1333 | /* output_stream()-- Return a stream pointer to the default output stream. |
4ee9c684 | 1334 | * Called on initialization. */ |
1335 | ||
1336 | stream * | |
1337 | output_stream (void) | |
1338 | { | |
3e45a719 | 1339 | stream * s; |
1340 | ||
e693d7f1 | 1341 | #if defined(HAVE_CRLF) && defined(HAVE_SETMODE) |
1342 | setmode (STDOUT_FILENO, O_BINARY); | |
1343 | #endif | |
3e45a719 | 1344 | |
aadbd4ae | 1345 | s = fd_to_stream (STDOUT_FILENO); |
3e45a719 | 1346 | return s; |
4ee9c684 | 1347 | } |
1348 | ||
1349 | ||
ff81ee3b | 1350 | /* error_stream()-- Return a stream pointer to the default error stream. |
1351 | * Called on initialization. */ | |
1352 | ||
1353 | stream * | |
1354 | error_stream (void) | |
1355 | { | |
3e45a719 | 1356 | stream * s; |
1357 | ||
e693d7f1 | 1358 | #if defined(HAVE_CRLF) && defined(HAVE_SETMODE) |
1359 | setmode (STDERR_FILENO, O_BINARY); | |
1360 | #endif | |
3e45a719 | 1361 | |
aadbd4ae | 1362 | s = fd_to_stream (STDERR_FILENO); |
3e45a719 | 1363 | return s; |
ff81ee3b | 1364 | } |
1365 | ||
4ee9c684 | 1366 | |
4ee9c684 | 1367 | /* compare_file_filename()-- Given an open stream and a fortran string |
1368 | * that is a filename, figure out if the file is the same as the | |
1369 | * filename. */ | |
1370 | ||
1371 | int | |
daad4fd5 | 1372 | compare_file_filename (gfc_unit *u, const char *name, int len) |
4ee9c684 | 1373 | { |
de28dd31 | 1374 | char path[min(PATH_MAX, len + 1)]; |
f6854450 | 1375 | struct stat st; |
daad4fd5 | 1376 | #ifdef HAVE_WORKING_STAT |
01cd2c93 | 1377 | unix_stream *s; |
c0ecd33c | 1378 | #else |
1379 | # ifdef __MINGW32__ | |
1380 | uint64_t id1, id2; | |
1381 | # endif | |
daad4fd5 | 1382 | #endif |
4ee9c684 | 1383 | |
1384 | if (unpack_filename (path, name, len)) | |
1385 | return 0; /* Can't be the same */ | |
1386 | ||
1387 | /* If the filename doesn't exist, then there is no match with the | |
1388 | * existing file. */ | |
1389 | ||
01cd2c93 | 1390 | if (stat (path, &st) < 0) |
4ee9c684 | 1391 | return 0; |
1392 | ||
daad4fd5 | 1393 | #ifdef HAVE_WORKING_STAT |
01cd2c93 | 1394 | s = (unix_stream *) (u->s); |
1395 | return (st.st_dev == s->st_dev) && (st.st_ino == s->st_ino); | |
daad4fd5 | 1396 | #else |
c0ecd33c | 1397 | |
1398 | # ifdef __MINGW32__ | |
1399 | /* We try to match files by a unique ID. On some filesystems (network | |
1400 | fs and FAT), we can't generate this unique ID, and will simply compare | |
1401 | filenames. */ | |
1402 | id1 = id_from_path (path); | |
1403 | id2 = id_from_fd (((unix_stream *) (u->s))->fd); | |
1404 | if (id1 || id2) | |
1405 | return (id1 == id2); | |
1406 | # endif | |
1407 | ||
daad4fd5 | 1408 | if (len != u->file_len) |
1409 | return 0; | |
1410 | return (memcmp(path, u->file, len) == 0); | |
1411 | #endif | |
4ee9c684 | 1412 | } |
1413 | ||
1414 | ||
60c514ba | 1415 | #ifdef HAVE_WORKING_STAT |
f6854450 | 1416 | # define FIND_FILE0_DECL struct stat *st |
60c514ba | 1417 | # define FIND_FILE0_ARGS st |
1418 | #else | |
c0ecd33c | 1419 | # define FIND_FILE0_DECL uint64_t id, const char *file, gfc_charlen_type file_len |
1420 | # define FIND_FILE0_ARGS id, file, file_len | |
60c514ba | 1421 | #endif |
1422 | ||
4ee9c684 | 1423 | /* find_file0()-- Recursive work function for find_file() */ |
1424 | ||
f02dd226 | 1425 | static gfc_unit * |
60c514ba | 1426 | find_file0 (gfc_unit *u, FIND_FILE0_DECL) |
4ee9c684 | 1427 | { |
f02dd226 | 1428 | gfc_unit *v; |
c0ecd33c | 1429 | #if defined(__MINGW32__) && !HAVE_WORKING_STAT |
1430 | uint64_t id1; | |
1431 | #endif | |
4ee9c684 | 1432 | |
1433 | if (u == NULL) | |
1434 | return NULL; | |
1435 | ||
daad4fd5 | 1436 | #ifdef HAVE_WORKING_STAT |
01cd2c93 | 1437 | if (u->s != NULL) |
1438 | { | |
1439 | unix_stream *s = (unix_stream *) (u->s); | |
1440 | if (st[0].st_dev == s->st_dev && st[0].st_ino == s->st_ino) | |
1441 | return u; | |
1442 | } | |
daad4fd5 | 1443 | #else |
c0ecd33c | 1444 | # ifdef __MINGW32__ |
1445 | if (u->s && ((id1 = id_from_fd (((unix_stream *) u->s)->fd)) || id1)) | |
1446 | { | |
1447 | if (id == id1) | |
1448 | return u; | |
1449 | } | |
1450 | else | |
1451 | # endif | |
1452 | if (compare_string (u->file_len, u->file, file_len, file) == 0) | |
1453 | return u; | |
daad4fd5 | 1454 | #endif |
4ee9c684 | 1455 | |
60c514ba | 1456 | v = find_file0 (u->left, FIND_FILE0_ARGS); |
4ee9c684 | 1457 | if (v != NULL) |
1458 | return v; | |
1459 | ||
60c514ba | 1460 | v = find_file0 (u->right, FIND_FILE0_ARGS); |
4ee9c684 | 1461 | if (v != NULL) |
1462 | return v; | |
1463 | ||
1464 | return NULL; | |
1465 | } | |
1466 | ||
1467 | ||
1468 | /* find_file()-- Take the current filename and see if there is a unit | |
1469 | * that has the file already open. Returns a pointer to the unit if so. */ | |
1470 | ||
f02dd226 | 1471 | gfc_unit * |
60c514ba | 1472 | find_file (const char *file, gfc_charlen_type file_len) |
4ee9c684 | 1473 | { |
de28dd31 | 1474 | char path[min(PATH_MAX, file_len + 1)]; |
f6854450 | 1475 | struct stat st[1]; |
60c514ba | 1476 | gfc_unit *u; |
c12dc7d7 | 1477 | #if defined(__MINGW32__) && !HAVE_WORKING_STAT |
1478 | uint64_t id = 0ULL; | |
1479 | #endif | |
4ee9c684 | 1480 | |
60c514ba | 1481 | if (unpack_filename (path, file, file_len)) |
4ee9c684 | 1482 | return NULL; |
1483 | ||
60c514ba | 1484 | if (stat (path, &st[0]) < 0) |
4ee9c684 | 1485 | return NULL; |
1486 | ||
c0ecd33c | 1487 | #if defined(__MINGW32__) && !HAVE_WORKING_STAT |
c12dc7d7 | 1488 | id = id_from_path (path); |
c0ecd33c | 1489 | #endif |
1490 | ||
60c514ba | 1491 | __gthread_mutex_lock (&unit_lock); |
1492 | retry: | |
1493 | u = find_file0 (unit_root, FIND_FILE0_ARGS); | |
1494 | if (u != NULL) | |
1495 | { | |
1496 | /* Fast path. */ | |
1497 | if (! __gthread_mutex_trylock (&u->lock)) | |
1498 | { | |
1499 | /* assert (u->closed == 0); */ | |
1500 | __gthread_mutex_unlock (&unit_lock); | |
1501 | return u; | |
1502 | } | |
1503 | ||
1504 | inc_waiting_locked (u); | |
1505 | } | |
1506 | __gthread_mutex_unlock (&unit_lock); | |
1507 | if (u != NULL) | |
1508 | { | |
1509 | __gthread_mutex_lock (&u->lock); | |
1510 | if (u->closed) | |
1511 | { | |
1512 | __gthread_mutex_lock (&unit_lock); | |
1513 | __gthread_mutex_unlock (&u->lock); | |
1514 | if (predec_waiting_locked (u) == 0) | |
5e62a3cc | 1515 | free (u); |
60c514ba | 1516 | goto retry; |
1517 | } | |
1518 | ||
1519 | dec_waiting_unlocked (u); | |
1520 | } | |
1521 | return u; | |
1522 | } | |
1523 | ||
1524 | static gfc_unit * | |
1525 | flush_all_units_1 (gfc_unit *u, int min_unit) | |
1526 | { | |
1527 | while (u != NULL) | |
1528 | { | |
1529 | if (u->unit_number > min_unit) | |
1530 | { | |
1531 | gfc_unit *r = flush_all_units_1 (u->left, min_unit); | |
1532 | if (r != NULL) | |
1533 | return r; | |
1534 | } | |
1535 | if (u->unit_number >= min_unit) | |
1536 | { | |
1537 | if (__gthread_mutex_trylock (&u->lock)) | |
1538 | return u; | |
1539 | if (u->s) | |
65f15010 | 1540 | sflush (u->s); |
60c514ba | 1541 | __gthread_mutex_unlock (&u->lock); |
1542 | } | |
1543 | u = u->right; | |
1544 | } | |
1545 | return NULL; | |
1546 | } | |
1547 | ||
1548 | void | |
1549 | flush_all_units (void) | |
1550 | { | |
1551 | gfc_unit *u; | |
1552 | int min_unit = 0; | |
1553 | ||
1554 | __gthread_mutex_lock (&unit_lock); | |
1555 | do | |
1556 | { | |
1557 | u = flush_all_units_1 (unit_root, min_unit); | |
1558 | if (u != NULL) | |
1559 | inc_waiting_locked (u); | |
1560 | __gthread_mutex_unlock (&unit_lock); | |
1561 | if (u == NULL) | |
1562 | return; | |
1563 | ||
1564 | __gthread_mutex_lock (&u->lock); | |
1565 | ||
1566 | min_unit = u->unit_number + 1; | |
1567 | ||
1568 | if (u->closed == 0) | |
1569 | { | |
65f15010 | 1570 | sflush (u->s); |
60c514ba | 1571 | __gthread_mutex_lock (&unit_lock); |
1572 | __gthread_mutex_unlock (&u->lock); | |
1573 | (void) predec_waiting_locked (u); | |
1574 | } | |
1575 | else | |
1576 | { | |
1577 | __gthread_mutex_lock (&unit_lock); | |
1578 | __gthread_mutex_unlock (&u->lock); | |
1579 | if (predec_waiting_locked (u) == 0) | |
5e62a3cc | 1580 | free (u); |
60c514ba | 1581 | } |
1582 | } | |
1583 | while (1); | |
4ee9c684 | 1584 | } |
1585 | ||
1586 | ||
4ee9c684 | 1587 | /* delete_file()-- Given a unit structure, delete the file associated |
1588 | * with the unit. Returns nonzero if something went wrong. */ | |
1589 | ||
1590 | int | |
f02dd226 | 1591 | delete_file (gfc_unit * u) |
4ee9c684 | 1592 | { |
de28dd31 | 1593 | char path[min(PATH_MAX, u->file_len + 1)]; |
1594 | int err = unpack_filename (path, u->file, u->file_len); | |
4ee9c684 | 1595 | |
de28dd31 | 1596 | if (err) |
4ee9c684 | 1597 | { /* Shouldn't be possible */ |
de28dd31 | 1598 | errno = err; |
4ee9c684 | 1599 | return 1; |
1600 | } | |
1601 | ||
1602 | return unlink (path); | |
1603 | } | |
1604 | ||
1605 | ||
1606 | /* file_exists()-- Returns nonzero if the current filename exists on | |
1607 | * the system */ | |
1608 | ||
1609 | int | |
60c514ba | 1610 | file_exists (const char *file, gfc_charlen_type file_len) |
4ee9c684 | 1611 | { |
de28dd31 | 1612 | char path[min(PATH_MAX, file_len + 1)]; |
4ee9c684 | 1613 | |
60c514ba | 1614 | if (unpack_filename (path, file, file_len)) |
4ee9c684 | 1615 | return 0; |
1616 | ||
fb053cd1 | 1617 | return !(access (path, F_OK)); |
4ee9c684 | 1618 | } |
1619 | ||
1620 | ||
f4e9c676 | 1621 | /* file_size()-- Returns the size of the file. */ |
1622 | ||
1623 | GFC_IO_INT | |
1624 | file_size (const char *file, gfc_charlen_type file_len) | |
1625 | { | |
de28dd31 | 1626 | char path[min(PATH_MAX, file_len + 1)]; |
f6854450 | 1627 | struct stat statbuf; |
f4e9c676 | 1628 | |
1629 | if (unpack_filename (path, file, file_len)) | |
1630 | return -1; | |
1631 | ||
1632 | if (stat (path, &statbuf) < 0) | |
1633 | return -1; | |
1634 | ||
1635 | return (GFC_IO_INT) statbuf.st_size; | |
1636 | } | |
4ee9c684 | 1637 | |
fb35179a | 1638 | static const char yes[] = "YES", no[] = "NO", unknown[] = "UNKNOWN"; |
4ee9c684 | 1639 | |
1640 | /* inquire_sequential()-- Given a fortran string, determine if the | |
1641 | * file is suitable for sequential access. Returns a C-style | |
1642 | * string. */ | |
1643 | ||
1644 | const char * | |
1645 | inquire_sequential (const char *string, int len) | |
1646 | { | |
de28dd31 | 1647 | char path[min(PATH_MAX, len + 1)]; |
f6854450 | 1648 | struct stat statbuf; |
4ee9c684 | 1649 | |
1650 | if (string == NULL || | |
1651 | unpack_filename (path, string, len) || stat (path, &statbuf) < 0) | |
1652 | return unknown; | |
1653 | ||
1654 | if (S_ISREG (statbuf.st_mode) || | |
1655 | S_ISCHR (statbuf.st_mode) || S_ISFIFO (statbuf.st_mode)) | |
2e1fa727 | 1656 | return unknown; |
4ee9c684 | 1657 | |
1658 | if (S_ISDIR (statbuf.st_mode) || S_ISBLK (statbuf.st_mode)) | |
1659 | return no; | |
1660 | ||
1661 | return unknown; | |
1662 | } | |
1663 | ||
1664 | ||
1665 | /* inquire_direct()-- Given a fortran string, determine if the file is | |
1666 | * suitable for direct access. Returns a C-style string. */ | |
1667 | ||
1668 | const char * | |
1669 | inquire_direct (const char *string, int len) | |
1670 | { | |
de28dd31 | 1671 | char path[min(PATH_MAX, len + 1)]; |
f6854450 | 1672 | struct stat statbuf; |
4ee9c684 | 1673 | |
1674 | if (string == NULL || | |
1675 | unpack_filename (path, string, len) || stat (path, &statbuf) < 0) | |
1676 | return unknown; | |
1677 | ||
1678 | if (S_ISREG (statbuf.st_mode) || S_ISBLK (statbuf.st_mode)) | |
2e1fa727 | 1679 | return unknown; |
4ee9c684 | 1680 | |
1681 | if (S_ISDIR (statbuf.st_mode) || | |
1682 | S_ISCHR (statbuf.st_mode) || S_ISFIFO (statbuf.st_mode)) | |
1683 | return no; | |
1684 | ||
1685 | return unknown; | |
1686 | } | |
1687 | ||
1688 | ||
1689 | /* inquire_formatted()-- Given a fortran string, determine if the file | |
1690 | * is suitable for formatted form. Returns a C-style string. */ | |
1691 | ||
1692 | const char * | |
1693 | inquire_formatted (const char *string, int len) | |
1694 | { | |
de28dd31 | 1695 | char path[min(PATH_MAX, len + 1)]; |
f6854450 | 1696 | struct stat statbuf; |
4ee9c684 | 1697 | |
1698 | if (string == NULL || | |
1699 | unpack_filename (path, string, len) || stat (path, &statbuf) < 0) | |
1700 | return unknown; | |
1701 | ||
1702 | if (S_ISREG (statbuf.st_mode) || | |
1703 | S_ISBLK (statbuf.st_mode) || | |
1704 | S_ISCHR (statbuf.st_mode) || S_ISFIFO (statbuf.st_mode)) | |
2e1fa727 | 1705 | return unknown; |
4ee9c684 | 1706 | |
1707 | if (S_ISDIR (statbuf.st_mode)) | |
1708 | return no; | |
1709 | ||
1710 | return unknown; | |
1711 | } | |
1712 | ||
1713 | ||
1714 | /* inquire_unformatted()-- Given a fortran string, determine if the file | |
1715 | * is suitable for unformatted form. Returns a C-style string. */ | |
1716 | ||
1717 | const char * | |
1718 | inquire_unformatted (const char *string, int len) | |
1719 | { | |
4ee9c684 | 1720 | return inquire_formatted (string, len); |
1721 | } | |
1722 | ||
1723 | ||
1724 | /* inquire_access()-- Given a fortran string, determine if the file is | |
1725 | * suitable for access. */ | |
1726 | ||
1727 | static const char * | |
1728 | inquire_access (const char *string, int len, int mode) | |
1729 | { | |
de28dd31 | 1730 | char path[min(PATH_MAX, len + 1)]; |
4ee9c684 | 1731 | |
1732 | if (string == NULL || unpack_filename (path, string, len) || | |
1733 | access (path, mode) < 0) | |
1734 | return no; | |
1735 | ||
1736 | return yes; | |
1737 | } | |
1738 | ||
1739 | ||
1740 | /* inquire_read()-- Given a fortran string, determine if the file is | |
1741 | * suitable for READ access. */ | |
1742 | ||
1743 | const char * | |
1744 | inquire_read (const char *string, int len) | |
1745 | { | |
4ee9c684 | 1746 | return inquire_access (string, len, R_OK); |
1747 | } | |
1748 | ||
1749 | ||
1750 | /* inquire_write()-- Given a fortran string, determine if the file is | |
1751 | * suitable for READ access. */ | |
1752 | ||
1753 | const char * | |
1754 | inquire_write (const char *string, int len) | |
1755 | { | |
4ee9c684 | 1756 | return inquire_access (string, len, W_OK); |
1757 | } | |
1758 | ||
1759 | ||
1760 | /* inquire_readwrite()-- Given a fortran string, determine if the file is | |
1761 | * suitable for read and write access. */ | |
1762 | ||
1763 | const char * | |
1764 | inquire_readwrite (const char *string, int len) | |
1765 | { | |
4ee9c684 | 1766 | return inquire_access (string, len, R_OK | W_OK); |
1767 | } | |
1768 | ||
1769 | ||
60d77e0d | 1770 | int |
1771 | stream_isatty (stream *s) | |
1772 | { | |
1773 | return isatty (((unix_stream *) s)->fd); | |
1774 | } | |
1775 | ||
57f34837 | 1776 | int |
1777 | stream_ttyname (stream *s __attribute__ ((unused)), | |
1778 | char * buf __attribute__ ((unused)), | |
1779 | size_t buflen __attribute__ ((unused))) | |
1780 | { | |
1781 | #ifdef HAVE_TTYNAME_R | |
1782 | return ttyname_r (((unix_stream *) s)->fd, buf, buflen); | |
1783 | #elif defined HAVE_TTYNAME | |
1784 | char *p; | |
1785 | size_t plen; | |
1786 | p = ttyname (((unix_stream *) s)->fd); | |
1787 | if (!p) | |
1788 | return errno; | |
1789 | plen = strlen (p); | |
1790 | if (buflen < plen) | |
1791 | plen = buflen; | |
1792 | memcpy (buf, p, plen); | |
1793 | return 0; | |
f2c0a16d | 1794 | #else |
57f34837 | 1795 | return ENOSYS; |
3479b863 | 1796 | #endif |
57f34837 | 1797 | } |
1798 | ||
3479b863 | 1799 | |
60d77e0d | 1800 | |
4ee9c684 | 1801 | |
1802 | /* How files are stored: This is an operating-system specific issue, | |
1803 | and therefore belongs here. There are three cases to consider. | |
1804 | ||
1805 | Direct Access: | |
1806 | Records are written as block of bytes corresponding to the record | |
1807 | length of the file. This goes for both formatted and unformatted | |
1808 | records. Positioning is done explicitly for each data transfer, | |
1809 | so positioning is not much of an issue. | |
1810 | ||
1811 | Sequential Formatted: | |
1812 | Records are separated by newline characters. The newline character | |
1813 | is prohibited from appearing in a string. If it does, this will be | |
1814 | messed up on the next read. End of file is also the end of a record. | |
1815 | ||
1816 | Sequential Unformatted: | |
1817 | In this case, we are merely copying bytes to and from main storage, | |
1818 | yet we need to keep track of varying record lengths. We adopt | |
1819 | the solution used by f2c. Each record contains a pair of length | |
1820 | markers: | |
1821 | ||
84d33b91 | 1822 | Length of record n in bytes |
1823 | Data of record n | |
1824 | Length of record n in bytes | |
4ee9c684 | 1825 | |
84d33b91 | 1826 | Length of record n+1 in bytes |
1827 | Data of record n+1 | |
1828 | Length of record n+1 in bytes | |
4ee9c684 | 1829 | |
1830 | The length is stored at the end of a record to allow backspacing to the | |
1831 | previous record. Between data transfer statements, the file pointer | |
1832 | is left pointing to the first length of the current record. | |
1833 | ||
1834 | ENDFILE records are never explicitly stored. | |
1835 | ||
1836 | */ |