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0dce3ca1 | 1 | /* Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007 |
8f2a1406 | 2 | Free Software Foundation, Inc. |
6de9cd9a DN |
3 | Contributed by Andy Vaught |
4 | ||
5 | This file is part of the GNU Fortran 95 runtime library (libgfortran). | |
6 | ||
7 | Libgfortran 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 2, or (at your option) | |
10 | any later version. | |
11 | ||
57dea9f6 TM |
12 | In addition to the permissions in the GNU General Public License, the |
13 | Free Software Foundation gives you unlimited permission to link the | |
14 | compiled version of this file into combinations with other programs, | |
15 | and to distribute those combinations without any restriction coming | |
16 | from the use of this file. (The General Public License restrictions | |
17 | do apply in other respects; for example, they cover modification of | |
18 | the file, and distribution when not linked into a combine | |
19 | executable.) | |
20 | ||
6de9cd9a DN |
21 | Libgfortran is distributed in the hope that it will be useful, |
22 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | GNU General Public License for more details. | |
25 | ||
26 | You should have received a copy of the GNU General Public License | |
27 | along with Libgfortran; see the file COPYING. If not, write to | |
fe2ae685 KC |
28 | the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
29 | Boston, MA 02110-1301, USA. */ | |
6de9cd9a DN |
30 | |
31 | /* Unix stream I/O module */ | |
32 | ||
36ae8a61 | 33 | #include "io.h" |
6de9cd9a DN |
34 | #include <stdlib.h> |
35 | #include <limits.h> | |
36 | ||
37 | #include <unistd.h> | |
38 | #include <sys/stat.h> | |
39 | #include <fcntl.h> | |
59154ed2 | 40 | #include <assert.h> |
6de9cd9a | 41 | |
6de9cd9a DN |
42 | #include <string.h> |
43 | #include <errno.h> | |
44 | ||
fe046210 FXC |
45 | |
46 | /* For mingw, we don't identify files by their inode number, but by a | |
47 | 64-bit identifier created from a BY_HANDLE_FILE_INFORMATION. */ | |
48 | #if defined(__MINGW32__) && !HAVE_WORKING_STAT | |
49 | ||
50 | #define WIN32_LEAN_AND_MEAN | |
51 | #include <windows.h> | |
52 | ||
53 | static uint64_t | |
54 | id_from_handle (HANDLE hFile) | |
55 | { | |
56 | BY_HANDLE_FILE_INFORMATION FileInformation; | |
57 | ||
58 | if (hFile == INVALID_HANDLE_VALUE) | |
59 | return 0; | |
60 | ||
61 | memset (&FileInformation, 0, sizeof(FileInformation)); | |
62 | if (!GetFileInformationByHandle (hFile, &FileInformation)) | |
63 | return 0; | |
64 | ||
65 | return ((uint64_t) FileInformation.nFileIndexLow) | |
66 | | (((uint64_t) FileInformation.nFileIndexHigh) << 32); | |
67 | } | |
68 | ||
69 | ||
70 | static uint64_t | |
71 | id_from_path (const char *path) | |
72 | { | |
73 | HANDLE hFile; | |
74 | uint64_t res; | |
75 | ||
76 | if (!path || !*path || access (path, F_OK)) | |
77 | return (uint64_t) -1; | |
78 | ||
79 | hFile = CreateFile (path, 0, 0, NULL, OPEN_EXISTING, | |
80 | FILE_FLAG_BACKUP_SEMANTICS | FILE_ATTRIBUTE_READONLY, | |
81 | NULL); | |
82 | res = id_from_handle (hFile); | |
83 | CloseHandle (hFile); | |
84 | return res; | |
85 | } | |
86 | ||
87 | ||
88 | static uint64_t | |
89 | id_from_fd (const int fd) | |
90 | { | |
91 | return id_from_handle ((HANDLE) _get_osfhandle (fd)); | |
92 | } | |
93 | ||
94 | #endif | |
95 | ||
96 | ||
97 | ||
c7ba5f8d FXC |
98 | #ifndef SSIZE_MAX |
99 | #define SSIZE_MAX SHRT_MAX | |
100 | #endif | |
101 | ||
6de9cd9a DN |
102 | #ifndef PATH_MAX |
103 | #define PATH_MAX 1024 | |
104 | #endif | |
105 | ||
f596fc98 AL |
106 | #ifndef PROT_READ |
107 | #define PROT_READ 1 | |
108 | #endif | |
109 | ||
110 | #ifndef PROT_WRITE | |
111 | #define PROT_WRITE 2 | |
112 | #endif | |
113 | ||
41724e6a AL |
114 | /* These flags aren't defined on all targets (mingw32), so provide them |
115 | here. */ | |
116 | #ifndef S_IRGRP | |
117 | #define S_IRGRP 0 | |
118 | #endif | |
119 | ||
120 | #ifndef S_IWGRP | |
121 | #define S_IWGRP 0 | |
122 | #endif | |
123 | ||
124 | #ifndef S_IROTH | |
125 | #define S_IROTH 0 | |
126 | #endif | |
127 | ||
128 | #ifndef S_IWOTH | |
129 | #define S_IWOTH 0 | |
130 | #endif | |
131 | ||
0dce3ca1 FXC |
132 | |
133 | /* Unix stream I/O module */ | |
134 | ||
135 | #define BUFFER_SIZE 8192 | |
136 | ||
137 | typedef struct | |
138 | { | |
139 | stream st; | |
140 | ||
141 | int fd; | |
142 | gfc_offset buffer_offset; /* File offset of the start of the buffer */ | |
143 | gfc_offset physical_offset; /* Current physical file offset */ | |
144 | gfc_offset logical_offset; /* Current logical file offset */ | |
145 | gfc_offset dirty_offset; /* Start of modified bytes in buffer */ | |
146 | gfc_offset file_length; /* Length of the file, -1 if not seekable. */ | |
147 | ||
0dce3ca1 FXC |
148 | int len; /* Physical length of the current buffer */ |
149 | int active; /* Length of valid bytes in the buffer */ | |
150 | ||
151 | int prot; | |
152 | int ndirty; /* Dirty bytes starting at dirty_offset */ | |
153 | ||
154 | int special_file; /* =1 if the fd refers to a special file */ | |
155 | ||
c132497f | 156 | int unbuffered; /* =1 if the stream is not buffered */ |
0dce3ca1 | 157 | |
d40150cc | 158 | char *buffer; |
899583cb | 159 | char small_buffer[BUFFER_SIZE]; |
0dce3ca1 FXC |
160 | } |
161 | unix_stream; | |
162 | ||
c132497f JB |
163 | |
164 | /* Stream structure for internal files. Fields must be kept in sync | |
165 | with unix_stream above, except for the buffer. For internal files | |
166 | we point the buffer pointer directly at the destination memory. */ | |
167 | ||
168 | typedef struct | |
169 | { | |
170 | stream st; | |
171 | ||
172 | int fd; | |
173 | gfc_offset buffer_offset; /* File offset of the start of the buffer */ | |
174 | gfc_offset physical_offset; /* Current physical file offset */ | |
175 | gfc_offset logical_offset; /* Current logical file offset */ | |
176 | gfc_offset dirty_offset; /* Start of modified bytes in buffer */ | |
177 | gfc_offset file_length; /* Length of the file, -1 if not seekable. */ | |
178 | ||
179 | int len; /* Physical length of the current buffer */ | |
180 | int active; /* Length of valid bytes in the buffer */ | |
181 | ||
182 | int prot; | |
183 | int ndirty; /* Dirty bytes starting at dirty_offset */ | |
184 | ||
185 | int special_file; /* =1 if the fd refers to a special file */ | |
186 | ||
187 | int unbuffered; /* =1 if the stream is not buffered */ | |
188 | ||
189 | char *buffer; | |
190 | } | |
191 | int_stream; | |
192 | ||
6de9cd9a DN |
193 | /* This implementation of stream I/O is based on the paper: |
194 | * | |
195 | * "Exploiting the advantages of mapped files for stream I/O", | |
196 | * O. Krieger, M. Stumm and R. Umrau, "Proceedings of the 1992 Winter | |
197 | * USENIX conference", p. 27-42. | |
198 | * | |
199 | * It differs in a number of ways from the version described in the | |
200 | * paper. First of all, threads are not an issue during I/O and we | |
201 | * also don't have to worry about having multiple regions, since | |
202 | * fortran's I/O model only allows you to be one place at a time. | |
203 | * | |
204 | * On the other hand, we have to be able to writing at the end of a | |
205 | * stream, read from the start of a stream or read and write blocks of | |
206 | * bytes from an arbitrary position. After opening a file, a pointer | |
207 | * to a stream structure is returned, which is used to handle file | |
208 | * accesses until the file is closed. | |
209 | * | |
210 | * salloc_at_r(stream, len, where)-- Given a stream pointer, return a | |
211 | * pointer to a block of memory that mirror the file at position | |
212 | * 'where' that is 'len' bytes long. The len integer is updated to | |
213 | * reflect how many bytes were actually read. The only reason for a | |
214 | * short read is end of file. The file pointer is updated. The | |
215 | * pointer is valid until the next call to salloc_*. | |
216 | * | |
217 | * salloc_at_w(stream, len, where)-- Given the stream pointer, returns | |
218 | * a pointer to a block of memory that is updated to reflect the state | |
219 | * of the file. The length of the buffer is always equal to that | |
220 | * requested. The buffer must be completely set by the caller. When | |
221 | * data has been written, the sfree() function must be called to | |
222 | * indicate that the caller is done writing data to the buffer. This | |
223 | * may or may not cause a physical write. | |
224 | * | |
225 | * Short forms of these are salloc_r() and salloc_w() which drop the | |
226 | * 'where' parameter and use the current file pointer. */ | |
227 | ||
228 | ||
6de9cd9a DN |
229 | /*move_pos_offset()-- Move the record pointer right or left |
230 | *relative to current position */ | |
231 | ||
232 | int | |
233 | move_pos_offset (stream* st, int pos_off) | |
234 | { | |
235 | unix_stream * str = (unix_stream*)st; | |
236 | if (pos_off < 0) | |
237 | { | |
2f06ccc6 | 238 | str->logical_offset += pos_off; |
6de9cd9a | 239 | |
2f06ccc6 | 240 | if (str->dirty_offset + str->ndirty > str->logical_offset) |
6de9cd9a | 241 | { |
2f06ccc6 FXC |
242 | if (str->ndirty + pos_off > 0) |
243 | str->ndirty += pos_off; | |
6de9cd9a DN |
244 | else |
245 | { | |
246 | str->dirty_offset += pos_off + pos_off; | |
2f06ccc6 | 247 | str->ndirty = 0; |
6de9cd9a DN |
248 | } |
249 | } | |
250 | ||
2f06ccc6 | 251 | return pos_off; |
6de9cd9a | 252 | } |
2f06ccc6 | 253 | return 0; |
6de9cd9a DN |
254 | } |
255 | ||
256 | ||
257 | /* fix_fd()-- Given a file descriptor, make sure it is not one of the | |
258 | * standard descriptors, returning a non-standard descriptor. If the | |
259 | * user specifies that system errors should go to standard output, | |
260 | * then closes standard output, we don't want the system errors to a | |
261 | * file that has been given file descriptor 1 or 0. We want to send | |
262 | * the error to the invalid descriptor. */ | |
263 | ||
264 | static int | |
265 | fix_fd (int fd) | |
266 | { | |
2515e5a7 | 267 | #ifdef HAVE_DUP |
6de9cd9a DN |
268 | int input, output, error; |
269 | ||
270 | input = output = error = 0; | |
271 | ||
f21edfd6 RH |
272 | /* Unix allocates the lowest descriptors first, so a loop is not |
273 | required, but this order is. */ | |
6de9cd9a DN |
274 | if (fd == STDIN_FILENO) |
275 | { | |
276 | fd = dup (fd); | |
277 | input = 1; | |
278 | } | |
279 | if (fd == STDOUT_FILENO) | |
280 | { | |
281 | fd = dup (fd); | |
282 | output = 1; | |
283 | } | |
284 | if (fd == STDERR_FILENO) | |
285 | { | |
286 | fd = dup (fd); | |
287 | error = 1; | |
288 | } | |
289 | ||
290 | if (input) | |
291 | close (STDIN_FILENO); | |
292 | if (output) | |
293 | close (STDOUT_FILENO); | |
294 | if (error) | |
295 | close (STDERR_FILENO); | |
2515e5a7 | 296 | #endif |
6de9cd9a DN |
297 | |
298 | return fd; | |
299 | } | |
300 | ||
b65b81f9 FXC |
301 | int |
302 | is_preconnected (stream * s) | |
303 | { | |
304 | int fd; | |
305 | ||
306 | fd = ((unix_stream *) s)->fd; | |
307 | if (fd == STDIN_FILENO || fd == STDOUT_FILENO || fd == STDERR_FILENO) | |
308 | return 1; | |
309 | else | |
310 | return 0; | |
311 | } | |
6de9cd9a | 312 | |
159840cb FXC |
313 | /* If the stream corresponds to a preconnected unit, we flush the |
314 | corresponding C stream. This is bugware for mixed C-Fortran codes | |
315 | where the C code doesn't flush I/O before returning. */ | |
316 | void | |
317 | flush_if_preconnected (stream * s) | |
318 | { | |
319 | int fd; | |
320 | ||
321 | fd = ((unix_stream *) s)->fd; | |
322 | if (fd == STDIN_FILENO) | |
323 | fflush (stdin); | |
324 | else if (fd == STDOUT_FILENO) | |
325 | fflush (stdout); | |
326 | else if (fd == STDERR_FILENO) | |
327 | fflush (stderr); | |
328 | } | |
329 | ||
6de9cd9a | 330 | |
0dc43461 JB |
331 | /* Reset a stream after reading/writing. Assumes that the buffers have |
332 | been flushed. */ | |
333 | ||
334 | inline static void | |
335 | reset_stream (unix_stream * s, size_t bytes_rw) | |
6de9cd9a | 336 | { |
0dc43461 JB |
337 | s->physical_offset += bytes_rw; |
338 | s->logical_offset = s->physical_offset; | |
339 | if (s->file_length != -1 && s->physical_offset > s->file_length) | |
340 | s->file_length = s->physical_offset; | |
341 | } | |
6de9cd9a | 342 | |
6de9cd9a | 343 | |
0dc43461 JB |
344 | /* Read bytes into a buffer, allowing for short reads. If the nbytes |
345 | * argument is less on return than on entry, it is because we've hit | |
346 | * the end of file. */ | |
6de9cd9a | 347 | |
0dc43461 JB |
348 | static int |
349 | do_read (unix_stream * s, void * buf, size_t * nbytes) | |
350 | { | |
351 | ssize_t trans; | |
352 | size_t bytes_left; | |
353 | char *buf_st; | |
354 | int status; | |
355 | ||
356 | status = 0; | |
357 | bytes_left = *nbytes; | |
358 | buf_st = (char *) buf; | |
359 | ||
360 | /* We must read in a loop since some systems don't restart system | |
361 | calls in case of a signal. */ | |
362 | while (bytes_left > 0) | |
363 | { | |
364 | /* Requests between SSIZE_MAX and SIZE_MAX are undefined by SUSv3, | |
365 | so we must read in chunks smaller than SSIZE_MAX. */ | |
366 | trans = (bytes_left < SSIZE_MAX) ? bytes_left : SSIZE_MAX; | |
367 | trans = read (s->fd, buf_st, trans); | |
368 | if (trans < 0) | |
369 | { | |
370 | if (errno == EINTR) | |
371 | continue; | |
372 | else | |
373 | { | |
374 | status = errno; | |
375 | break; | |
376 | } | |
377 | } | |
378 | else if (trans == 0) /* We hit EOF. */ | |
379 | break; | |
380 | buf_st += trans; | |
381 | bytes_left -= trans; | |
6de9cd9a DN |
382 | } |
383 | ||
0dc43461 JB |
384 | *nbytes -= bytes_left; |
385 | return status; | |
6de9cd9a DN |
386 | } |
387 | ||
388 | ||
0dc43461 | 389 | /* Write a buffer to a stream, allowing for short writes. */ |
6de9cd9a DN |
390 | |
391 | static int | |
0dc43461 | 392 | do_write (unix_stream * s, const void * buf, size_t * nbytes) |
6de9cd9a | 393 | { |
0dc43461 JB |
394 | ssize_t trans; |
395 | size_t bytes_left; | |
396 | char *buf_st; | |
397 | int status; | |
398 | ||
399 | status = 0; | |
400 | bytes_left = *nbytes; | |
401 | buf_st = (char *) buf; | |
402 | ||
403 | /* We must write in a loop since some systems don't restart system | |
404 | calls in case of a signal. */ | |
405 | while (bytes_left > 0) | |
6de9cd9a | 406 | { |
0dc43461 JB |
407 | /* Requests between SSIZE_MAX and SIZE_MAX are undefined by SUSv3, |
408 | so we must write in chunks smaller than SSIZE_MAX. */ | |
409 | trans = (bytes_left < SSIZE_MAX) ? bytes_left : SSIZE_MAX; | |
410 | trans = write (s->fd, buf_st, trans); | |
411 | if (trans < 0) | |
412 | { | |
413 | if (errno == EINTR) | |
414 | continue; | |
415 | else | |
416 | { | |
417 | status = errno; | |
418 | break; | |
419 | } | |
420 | } | |
421 | buf_st += trans; | |
422 | bytes_left -= trans; | |
6de9cd9a DN |
423 | } |
424 | ||
0dc43461 JB |
425 | *nbytes -= bytes_left; |
426 | return status; | |
6de9cd9a | 427 | } |
6de9cd9a DN |
428 | |
429 | ||
430 | /* get_oserror()-- Get the most recent operating system error. For | |
431 | * unix, this is errno. */ | |
432 | ||
433 | const char * | |
434 | get_oserror (void) | |
435 | { | |
6de9cd9a DN |
436 | return strerror (errno); |
437 | } | |
438 | ||
439 | ||
6de9cd9a DN |
440 | /********************************************************************* |
441 | File descriptor stream functions | |
442 | *********************************************************************/ | |
443 | ||
0dc43461 | 444 | |
6de9cd9a DN |
445 | /* fd_flush()-- Write bytes that need to be written */ |
446 | ||
447 | static try | |
448 | fd_flush (unix_stream * s) | |
449 | { | |
0dc43461 JB |
450 | size_t writelen; |
451 | ||
6de9cd9a | 452 | if (s->ndirty == 0) |
779f3975 JD |
453 | return SUCCESS; |
454 | ||
455 | if (s->file_length != -1 && s->physical_offset != s->dirty_offset && | |
6de9cd9a DN |
456 | lseek (s->fd, s->dirty_offset, SEEK_SET) < 0) |
457 | return FAILURE; | |
458 | ||
0dc43461 JB |
459 | writelen = s->ndirty; |
460 | if (do_write (s, s->buffer + (s->dirty_offset - s->buffer_offset), | |
461 | &writelen) != 0) | |
6de9cd9a DN |
462 | return FAILURE; |
463 | ||
0dc43461 | 464 | s->physical_offset = s->dirty_offset + writelen; |
bf1df0a0 BD |
465 | |
466 | /* don't increment file_length if the file is non-seekable */ | |
467 | if (s->file_length != -1 && s->physical_offset > s->file_length) | |
0dc43461 JB |
468 | s->file_length = s->physical_offset; |
469 | ||
470 | s->ndirty -= writelen; | |
471 | if (s->ndirty != 0) | |
472 | return FAILURE; | |
6de9cd9a DN |
473 | |
474 | return SUCCESS; | |
475 | } | |
476 | ||
477 | ||
478 | /* fd_alloc()-- Arrange a buffer such that the salloc() request can be | |
479 | * satisfied. This subroutine gets the buffer ready for whatever is | |
480 | * to come next. */ | |
481 | ||
482 | static void | |
8f2a1406 AJ |
483 | fd_alloc (unix_stream * s, gfc_offset where, |
484 | int *len __attribute__ ((unused))) | |
6de9cd9a | 485 | { |
899583cb JD |
486 | char *new_buffer; |
487 | int n, read_len; | |
488 | ||
489 | if (*len <= BUFFER_SIZE) | |
490 | { | |
491 | new_buffer = s->small_buffer; | |
492 | read_len = BUFFER_SIZE; | |
493 | } | |
494 | else | |
495 | { | |
496 | new_buffer = get_mem (*len); | |
497 | read_len = *len; | |
498 | } | |
6de9cd9a DN |
499 | |
500 | /* Salvage bytes currently within the buffer. This is important for | |
501 | * devices that cannot seek. */ | |
502 | ||
899583cb | 503 | if (s->buffer != NULL && s->buffer_offset <= where && |
6de9cd9a DN |
504 | where <= s->buffer_offset + s->active) |
505 | { | |
506 | ||
507 | n = s->active - (where - s->buffer_offset); | |
899583cb | 508 | memmove (new_buffer, s->buffer + (where - s->buffer_offset), n); |
6de9cd9a DN |
509 | |
510 | s->active = n; | |
511 | } | |
512 | else | |
513 | { /* new buffer starts off empty */ | |
514 | s->active = 0; | |
515 | } | |
516 | ||
517 | s->buffer_offset = where; | |
518 | ||
899583cb JD |
519 | /* free the old buffer if necessary */ |
520 | ||
521 | if (s->buffer != NULL && s->buffer != s->small_buffer) | |
522 | free_mem (s->buffer); | |
523 | ||
524 | s->buffer = new_buffer; | |
525 | s->len = read_len; | |
6de9cd9a DN |
526 | } |
527 | ||
528 | ||
529 | /* fd_alloc_r_at()-- Allocate a stream buffer for reading. Either | |
530 | * we've already buffered the data or we need to load it. Returns | |
531 | * NULL on I/O error. */ | |
532 | ||
533 | static char * | |
81f4be3c | 534 | fd_alloc_r_at (unix_stream * s, int *len, gfc_offset where) |
6de9cd9a | 535 | { |
81f4be3c | 536 | gfc_offset m; |
6de9cd9a DN |
537 | |
538 | if (where == -1) | |
539 | where = s->logical_offset; | |
540 | ||
541 | if (s->buffer != NULL && s->buffer_offset <= where && | |
542 | where + *len <= s->buffer_offset + s->active) | |
543 | { | |
544 | ||
545 | /* Return a position within the current buffer */ | |
546 | ||
547 | s->logical_offset = where + *len; | |
548 | return s->buffer + where - s->buffer_offset; | |
549 | } | |
550 | ||
551 | fd_alloc (s, where, len); | |
552 | ||
553 | m = where + s->active; | |
554 | ||
555 | if (s->physical_offset != m && lseek (s->fd, m, SEEK_SET) < 0) | |
556 | return NULL; | |
557 | ||
c1d70e1a TK |
558 | /* do_read() hangs on read from terminals for *BSD-systems. Only |
559 | use read() in that case. */ | |
560 | ||
561 | if (s->special_file) | |
562 | { | |
563 | ssize_t n; | |
564 | ||
565 | n = read (s->fd, s->buffer + s->active, s->len - s->active); | |
566 | if (n < 0) | |
567 | return NULL; | |
568 | ||
d5f9d080 | 569 | s->physical_offset = m + n; |
c1d70e1a TK |
570 | s->active += n; |
571 | } | |
572 | else | |
573 | { | |
574 | size_t n; | |
6de9cd9a | 575 | |
c1d70e1a TK |
576 | n = s->len - s->active; |
577 | if (do_read (s, s->buffer + s->active, &n) != 0) | |
578 | return NULL; | |
579 | ||
d5f9d080 | 580 | s->physical_offset = m + n; |
c1d70e1a TK |
581 | s->active += n; |
582 | } | |
6de9cd9a | 583 | |
6de9cd9a DN |
584 | if (s->active < *len) |
585 | *len = s->active; /* Bytes actually available */ | |
586 | ||
587 | s->logical_offset = where + *len; | |
588 | ||
589 | return s->buffer; | |
590 | } | |
591 | ||
592 | ||
593 | /* fd_alloc_w_at()-- Allocate a stream buffer for writing. Either | |
594 | * we've already buffered the data or we need to load it. */ | |
595 | ||
596 | static char * | |
81f4be3c | 597 | fd_alloc_w_at (unix_stream * s, int *len, gfc_offset where) |
6de9cd9a | 598 | { |
81f4be3c | 599 | gfc_offset n; |
6de9cd9a DN |
600 | |
601 | if (where == -1) | |
602 | where = s->logical_offset; | |
603 | ||
604 | if (s->buffer == NULL || s->buffer_offset > where || | |
605 | where + *len > s->buffer_offset + s->len) | |
606 | { | |
607 | ||
608 | if (fd_flush (s) == FAILURE) | |
609 | return NULL; | |
610 | fd_alloc (s, where, len); | |
611 | } | |
612 | ||
613 | /* Return a position within the current buffer */ | |
bf1df0a0 BD |
614 | if (s->ndirty == 0 |
615 | || where > s->dirty_offset + s->ndirty | |
616 | || s->dirty_offset > where + *len) | |
617 | { /* Discontiguous blocks, start with a clean buffer. */ | |
618 | /* Flush the buffer. */ | |
619 | if (s->ndirty != 0) | |
620 | fd_flush (s); | |
621 | s->dirty_offset = where; | |
622 | s->ndirty = *len; | |
6de9cd9a DN |
623 | } |
624 | else | |
bf1df0a0 BD |
625 | { |
626 | gfc_offset start; /* Merge with the existing data. */ | |
627 | if (where < s->dirty_offset) | |
628 | start = where; | |
629 | else | |
630 | start = s->dirty_offset; | |
631 | if (where + *len > s->dirty_offset + s->ndirty) | |
632 | s->ndirty = where + *len - start; | |
633 | else | |
634 | s->ndirty = s->dirty_offset + s->ndirty - start; | |
d40150cc | 635 | s->dirty_offset = start; |
6de9cd9a DN |
636 | } |
637 | ||
638 | s->logical_offset = where + *len; | |
639 | ||
779f3975 JD |
640 | /* Don't increment file_length if the file is non-seekable. */ |
641 | ||
642 | if (s->file_length != -1 && s->logical_offset > s->file_length) | |
643 | s->file_length = s->logical_offset; | |
78579b60 | 644 | |
6de9cd9a DN |
645 | n = s->logical_offset - s->buffer_offset; |
646 | if (n > s->active) | |
647 | s->active = n; | |
648 | ||
649 | return s->buffer + where - s->buffer_offset; | |
650 | } | |
651 | ||
652 | ||
653 | static try | |
654 | fd_sfree (unix_stream * s) | |
655 | { | |
6de9cd9a | 656 | if (s->ndirty != 0 && |
899583cb JD |
657 | (s->buffer != s->small_buffer || options.all_unbuffered || |
658 | s->unbuffered)) | |
6de9cd9a DN |
659 | return fd_flush (s); |
660 | ||
661 | return SUCCESS; | |
662 | } | |
663 | ||
664 | ||
0dc43461 | 665 | static try |
81f4be3c | 666 | fd_seek (unix_stream * s, gfc_offset offset) |
6de9cd9a | 667 | { |
779f3975 JD |
668 | |
669 | if (s->file_length == -1) | |
670 | return SUCCESS; | |
671 | ||
c5418dcb JD |
672 | if (s->physical_offset == offset) /* Are we lucky and avoid syscall? */ |
673 | { | |
674 | s->logical_offset = offset; | |
675 | return SUCCESS; | |
676 | } | |
6de9cd9a | 677 | |
dcdc26df DF |
678 | if (lseek (s->fd, offset, SEEK_SET) >= 0) |
679 | { | |
680 | s->physical_offset = s->logical_offset = offset; | |
681 | s->active = 0; | |
682 | return SUCCESS; | |
683 | } | |
c5418dcb | 684 | |
dcdc26df | 685 | return FAILURE; |
6de9cd9a DN |
686 | } |
687 | ||
688 | ||
689 | /* truncate_file()-- Given a unit, truncate the file at the current | |
690 | * position. Sets the physical location to the new end of the file. | |
691 | * Returns nonzero on error. */ | |
692 | ||
693 | static try | |
694 | fd_truncate (unix_stream * s) | |
695 | { | |
779f3975 JD |
696 | /* Non-seekable files, like terminals and fifo's fail the lseek so just |
697 | return success, there is nothing to truncate. If its not a pipe there | |
698 | is a real problem. */ | |
bf1df0a0 | 699 | if (lseek (s->fd, s->logical_offset, SEEK_SET) == -1) |
779f3975 JD |
700 | { |
701 | if (errno == ESPIPE) | |
702 | return SUCCESS; | |
703 | else | |
704 | return FAILURE; | |
705 | } | |
6de9cd9a | 706 | |
779f3975 JD |
707 | /* Using ftruncate on a seekable special file (like /dev/null) |
708 | is undefined, so we treat it as if the ftruncate succeeded. */ | |
1fb2002d | 709 | #ifdef HAVE_FTRUNCATE |
5133e4b9 | 710 | if (s->special_file || ftruncate (s->fd, s->logical_offset)) |
1fb2002d FXC |
711 | #else |
712 | #ifdef HAVE_CHSIZE | |
5133e4b9 | 713 | if (s->special_file || chsize (s->fd, s->logical_offset)) |
1fb2002d FXC |
714 | #endif |
715 | #endif | |
802fc826 BD |
716 | { |
717 | s->physical_offset = s->file_length = 0; | |
99c6db71 | 718 | return SUCCESS; |
802fc826 | 719 | } |
bf1df0a0 BD |
720 | |
721 | s->physical_offset = s->file_length = s->logical_offset; | |
844234fb | 722 | s->active = 0; |
6de9cd9a DN |
723 | return SUCCESS; |
724 | } | |
725 | ||
726 | ||
82b8244c JB |
727 | /* Similar to memset(), but operating on a stream instead of a string. |
728 | Takes care of not using too much memory. */ | |
729 | ||
730 | static try | |
731 | fd_sset (unix_stream * s, int c, size_t n) | |
732 | { | |
733 | size_t bytes_left; | |
734 | int trans; | |
735 | void *p; | |
736 | ||
737 | bytes_left = n; | |
738 | ||
739 | while (bytes_left > 0) | |
740 | { | |
741 | /* memset() in chunks of BUFFER_SIZE. */ | |
742 | trans = (bytes_left < BUFFER_SIZE) ? bytes_left : BUFFER_SIZE; | |
743 | ||
744 | p = fd_alloc_w_at (s, &trans, -1); | |
745 | if (p) | |
746 | memset (p, c, trans); | |
747 | else | |
748 | return FAILURE; | |
749 | ||
750 | bytes_left -= trans; | |
751 | } | |
752 | ||
753 | return SUCCESS; | |
754 | } | |
0dc43461 JB |
755 | |
756 | ||
757 | /* Stream read function. Avoids using a buffer for big reads. The | |
758 | interface is like POSIX read(), but the nbytes argument is a | |
759 | pointer; on return it contains the number of bytes written. The | |
760 | function return value is the status indicator (0 for success). */ | |
761 | ||
762 | static int | |
763 | fd_read (unix_stream * s, void * buf, size_t * nbytes) | |
764 | { | |
765 | void *p; | |
766 | int tmp, status; | |
767 | ||
768 | if (*nbytes < BUFFER_SIZE && !s->unbuffered) | |
769 | { | |
770 | tmp = *nbytes; | |
771 | p = fd_alloc_r_at (s, &tmp, -1); | |
772 | if (p) | |
773 | { | |
774 | *nbytes = tmp; | |
775 | memcpy (buf, p, *nbytes); | |
776 | return 0; | |
777 | } | |
778 | else | |
779 | { | |
780 | *nbytes = 0; | |
781 | return errno; | |
782 | } | |
783 | } | |
784 | ||
785 | /* If the request is bigger than BUFFER_SIZE we flush the buffers | |
786 | and read directly. */ | |
787 | if (fd_flush (s) == FAILURE) | |
788 | { | |
789 | *nbytes = 0; | |
790 | return errno; | |
791 | } | |
792 | ||
c5418dcb | 793 | if (is_seekable ((stream *) s) && fd_seek (s, s->logical_offset) == FAILURE) |
0dc43461 JB |
794 | { |
795 | *nbytes = 0; | |
796 | return errno; | |
797 | } | |
798 | ||
799 | status = do_read (s, buf, nbytes); | |
800 | reset_stream (s, *nbytes); | |
801 | return status; | |
802 | } | |
803 | ||
804 | ||
805 | /* Stream write function. Avoids using a buffer for big writes. The | |
806 | interface is like POSIX write(), but the nbytes argument is a | |
807 | pointer; on return it contains the number of bytes written. The | |
808 | function return value is the status indicator (0 for success). */ | |
809 | ||
810 | static int | |
811 | fd_write (unix_stream * s, const void * buf, size_t * nbytes) | |
812 | { | |
813 | void *p; | |
814 | int tmp, status; | |
815 | ||
816 | if (*nbytes < BUFFER_SIZE && !s->unbuffered) | |
817 | { | |
818 | tmp = *nbytes; | |
819 | p = fd_alloc_w_at (s, &tmp, -1); | |
820 | if (p) | |
821 | { | |
822 | *nbytes = tmp; | |
823 | memcpy (p, buf, *nbytes); | |
824 | return 0; | |
825 | } | |
826 | else | |
827 | { | |
828 | *nbytes = 0; | |
829 | return errno; | |
830 | } | |
831 | } | |
832 | ||
833 | /* If the request is bigger than BUFFER_SIZE we flush the buffers | |
834 | and write directly. */ | |
835 | if (fd_flush (s) == FAILURE) | |
836 | { | |
837 | *nbytes = 0; | |
838 | return errno; | |
839 | } | |
840 | ||
c5418dcb | 841 | if (is_seekable ((stream *) s) && fd_seek (s, s->logical_offset) == FAILURE) |
0dc43461 JB |
842 | { |
843 | *nbytes = 0; | |
844 | return errno; | |
845 | } | |
846 | ||
847 | status = do_write (s, buf, nbytes); | |
848 | reset_stream (s, *nbytes); | |
849 | return status; | |
850 | } | |
851 | ||
852 | ||
6de9cd9a DN |
853 | static try |
854 | fd_close (unix_stream * s) | |
855 | { | |
6de9cd9a DN |
856 | if (fd_flush (s) == FAILURE) |
857 | return FAILURE; | |
858 | ||
899583cb JD |
859 | if (s->buffer != NULL && s->buffer != s->small_buffer) |
860 | free_mem (s->buffer); | |
861 | ||
12e59662 FXC |
862 | if (s->fd != STDOUT_FILENO && s->fd != STDERR_FILENO) |
863 | { | |
864 | if (close (s->fd) < 0) | |
865 | return FAILURE; | |
866 | } | |
6de9cd9a DN |
867 | |
868 | free_mem (s); | |
869 | ||
870 | return SUCCESS; | |
871 | } | |
872 | ||
873 | ||
874 | static void | |
875 | fd_open (unix_stream * s) | |
876 | { | |
6de9cd9a DN |
877 | if (isatty (s->fd)) |
878 | s->unbuffered = 1; | |
879 | ||
880 | s->st.alloc_r_at = (void *) fd_alloc_r_at; | |
881 | s->st.alloc_w_at = (void *) fd_alloc_w_at; | |
882 | s->st.sfree = (void *) fd_sfree; | |
883 | s->st.close = (void *) fd_close; | |
884 | s->st.seek = (void *) fd_seek; | |
200809cb | 885 | s->st.trunc = (void *) fd_truncate; |
0dc43461 JB |
886 | s->st.read = (void *) fd_read; |
887 | s->st.write = (void *) fd_write; | |
82b8244c | 888 | s->st.set = (void *) fd_sset; |
6de9cd9a | 889 | |
899583cb | 890 | s->buffer = NULL; |
6de9cd9a DN |
891 | } |
892 | ||
893 | ||
6de9cd9a | 894 | |
0dc43461 | 895 | |
6de9cd9a DN |
896 | /********************************************************************* |
897 | memory stream functions - These are used for internal files | |
898 | ||
899 | The idea here is that a single stream structure is created and all | |
900 | requests must be satisfied from it. The location and size of the | |
901 | buffer is the character variable supplied to the READ or WRITE | |
902 | statement. | |
903 | ||
904 | *********************************************************************/ | |
905 | ||
906 | ||
907 | static char * | |
c132497f | 908 | mem_alloc_r_at (int_stream * s, int *len, gfc_offset where) |
6de9cd9a | 909 | { |
81f4be3c | 910 | gfc_offset n; |
6de9cd9a DN |
911 | |
912 | if (where == -1) | |
913 | where = s->logical_offset; | |
914 | ||
915 | if (where < s->buffer_offset || where > s->buffer_offset + s->active) | |
916 | return NULL; | |
917 | ||
6de9cd9a DN |
918 | s->logical_offset = where + *len; |
919 | ||
bd72d66c | 920 | n = s->buffer_offset + s->active - where; |
6de9cd9a DN |
921 | if (*len > n) |
922 | *len = n; | |
923 | ||
924 | return s->buffer + (where - s->buffer_offset); | |
925 | } | |
926 | ||
927 | ||
928 | static char * | |
c132497f | 929 | mem_alloc_w_at (int_stream * s, int *len, gfc_offset where) |
6de9cd9a | 930 | { |
81f4be3c | 931 | gfc_offset m; |
6de9cd9a | 932 | |
59154ed2 JD |
933 | assert (*len >= 0); /* Negative values not allowed. */ |
934 | ||
6de9cd9a DN |
935 | if (where == -1) |
936 | where = s->logical_offset; | |
937 | ||
938 | m = where + *len; | |
939 | ||
59154ed2 | 940 | if (where < s->buffer_offset) |
6de9cd9a DN |
941 | return NULL; |
942 | ||
59154ed2 | 943 | if (m > s->file_length) |
aed6ee24 | 944 | return NULL; |
59154ed2 | 945 | |
6de9cd9a DN |
946 | s->logical_offset = m; |
947 | ||
948 | return s->buffer + (where - s->buffer_offset); | |
949 | } | |
950 | ||
951 | ||
0dc43461 JB |
952 | /* Stream read function for internal units. This is not actually used |
953 | at the moment, as all internal IO is formatted and the formatted IO | |
954 | routines use mem_alloc_r_at. */ | |
955 | ||
956 | static int | |
c132497f | 957 | mem_read (int_stream * s, void * buf, size_t * nbytes) |
0dc43461 JB |
958 | { |
959 | void *p; | |
960 | int tmp; | |
961 | ||
962 | tmp = *nbytes; | |
963 | p = mem_alloc_r_at (s, &tmp, -1); | |
964 | if (p) | |
965 | { | |
966 | *nbytes = tmp; | |
967 | memcpy (buf, p, *nbytes); | |
968 | return 0; | |
969 | } | |
970 | else | |
971 | { | |
972 | *nbytes = 0; | |
973 | return errno; | |
974 | } | |
975 | } | |
976 | ||
977 | ||
978 | /* Stream write function for internal units. This is not actually used | |
979 | at the moment, as all internal IO is formatted and the formatted IO | |
980 | routines use mem_alloc_w_at. */ | |
981 | ||
982 | static int | |
c132497f | 983 | mem_write (int_stream * s, const void * buf, size_t * nbytes) |
0dc43461 JB |
984 | { |
985 | void *p; | |
986 | int tmp; | |
987 | ||
988 | errno = 0; | |
989 | ||
990 | tmp = *nbytes; | |
991 | p = mem_alloc_w_at (s, &tmp, -1); | |
992 | if (p) | |
993 | { | |
994 | *nbytes = tmp; | |
995 | memcpy (p, buf, *nbytes); | |
996 | return 0; | |
997 | } | |
998 | else | |
999 | { | |
1000 | *nbytes = 0; | |
1001 | return errno; | |
1002 | } | |
1003 | } | |
1004 | ||
1005 | ||
6de9cd9a | 1006 | static int |
c132497f | 1007 | mem_seek (int_stream * s, gfc_offset offset) |
6de9cd9a | 1008 | { |
6de9cd9a DN |
1009 | if (offset > s->file_length) |
1010 | { | |
1011 | errno = ESPIPE; | |
1012 | return FAILURE; | |
1013 | } | |
1014 | ||
1015 | s->logical_offset = offset; | |
1016 | return SUCCESS; | |
1017 | } | |
1018 | ||
1019 | ||
82b8244c | 1020 | static try |
c132497f | 1021 | mem_set (int_stream * s, int c, size_t n) |
82b8244c JB |
1022 | { |
1023 | void *p; | |
1024 | int len; | |
1025 | ||
1026 | len = n; | |
1027 | ||
1028 | p = mem_alloc_w_at (s, &len, -1); | |
1029 | if (p) | |
1030 | { | |
1031 | memset (p, c, len); | |
1032 | return SUCCESS; | |
1033 | } | |
1034 | else | |
1035 | return FAILURE; | |
1036 | } | |
1037 | ||
1038 | ||
6de9cd9a | 1039 | static int |
c132497f | 1040 | mem_truncate (int_stream * s __attribute__ ((unused))) |
6de9cd9a | 1041 | { |
6de9cd9a DN |
1042 | return SUCCESS; |
1043 | } | |
1044 | ||
1045 | ||
1046 | static try | |
c132497f | 1047 | mem_close (int_stream * s) |
6de9cd9a | 1048 | { |
54ffdb12 JD |
1049 | if (s != NULL) |
1050 | free_mem (s); | |
6de9cd9a DN |
1051 | |
1052 | return SUCCESS; | |
1053 | } | |
1054 | ||
1055 | ||
1056 | static try | |
c132497f | 1057 | mem_sfree (int_stream * s __attribute__ ((unused))) |
6de9cd9a | 1058 | { |
6de9cd9a DN |
1059 | return SUCCESS; |
1060 | } | |
1061 | ||
1062 | ||
1063 | ||
1064 | /********************************************************************* | |
1065 | Public functions -- A reimplementation of this module needs to | |
1066 | define functional equivalents of the following. | |
1067 | *********************************************************************/ | |
1068 | ||
1069 | /* empty_internal_buffer()-- Zero the buffer of Internal file */ | |
1070 | ||
1071 | void | |
1072 | empty_internal_buffer(stream *strm) | |
1073 | { | |
c132497f | 1074 | int_stream * s = (int_stream *) strm; |
f21edfd6 | 1075 | memset(s->buffer, ' ', s->file_length); |
6de9cd9a DN |
1076 | } |
1077 | ||
1078 | /* open_internal()-- Returns a stream structure from an internal file */ | |
1079 | ||
1080 | stream * | |
1081 | open_internal (char *base, int length) | |
1082 | { | |
c132497f | 1083 | int_stream *s; |
6de9cd9a | 1084 | |
c132497f JB |
1085 | s = get_mem (sizeof (int_stream)); |
1086 | memset (s, '\0', sizeof (int_stream)); | |
6de9cd9a DN |
1087 | |
1088 | s->buffer = base; | |
1089 | s->buffer_offset = 0; | |
1090 | ||
1091 | s->logical_offset = 0; | |
1092 | s->active = s->file_length = length; | |
1093 | ||
1094 | s->st.alloc_r_at = (void *) mem_alloc_r_at; | |
1095 | s->st.alloc_w_at = (void *) mem_alloc_w_at; | |
1096 | s->st.sfree = (void *) mem_sfree; | |
1097 | s->st.close = (void *) mem_close; | |
1098 | s->st.seek = (void *) mem_seek; | |
200809cb | 1099 | s->st.trunc = (void *) mem_truncate; |
0dc43461 JB |
1100 | s->st.read = (void *) mem_read; |
1101 | s->st.write = (void *) mem_write; | |
82b8244c | 1102 | s->st.set = (void *) mem_set; |
6de9cd9a DN |
1103 | |
1104 | return (stream *) s; | |
1105 | } | |
1106 | ||
1107 | ||
1108 | /* fd_to_stream()-- Given an open file descriptor, build a stream | |
1109 | * around it. */ | |
1110 | ||
1111 | static stream * | |
ca0d06ac | 1112 | fd_to_stream (int fd, int prot) |
6de9cd9a DN |
1113 | { |
1114 | struct stat statbuf; | |
1115 | unix_stream *s; | |
1116 | ||
1117 | s = get_mem (sizeof (unix_stream)); | |
c42a19d5 | 1118 | memset (s, '\0', sizeof (unix_stream)); |
6de9cd9a DN |
1119 | |
1120 | s->fd = fd; | |
1121 | s->buffer_offset = 0; | |
1122 | s->physical_offset = 0; | |
1123 | s->logical_offset = 0; | |
1124 | s->prot = prot; | |
1125 | ||
1126 | /* Get the current length of the file. */ | |
1127 | ||
1128 | fstat (fd, &statbuf); | |
779f3975 JD |
1129 | |
1130 | if (lseek (fd, 0, SEEK_CUR) == (off_t) -1) | |
1131 | s->file_length = -1; | |
1132 | else | |
1133 | s->file_length = S_ISREG (statbuf.st_mode) ? statbuf.st_size : -1; | |
1134 | ||
5133e4b9 | 1135 | s->special_file = !S_ISREG (statbuf.st_mode); |
6de9cd9a | 1136 | |
6de9cd9a | 1137 | fd_open (s); |
6de9cd9a DN |
1138 | |
1139 | return (stream *) s; | |
1140 | } | |
1141 | ||
1142 | ||
df65f093 SK |
1143 | /* Given the Fortran unit number, convert it to a C file descriptor. */ |
1144 | ||
1145 | int | |
5e805e44 | 1146 | unit_to_fd (int unit) |
df65f093 | 1147 | { |
df65f093 | 1148 | gfc_unit *us; |
5e805e44 | 1149 | int fd; |
df65f093 | 1150 | |
5e805e44 | 1151 | us = find_unit (unit); |
df65f093 SK |
1152 | if (us == NULL) |
1153 | return -1; | |
1154 | ||
5e805e44 JJ |
1155 | fd = ((unix_stream *) us->s)->fd; |
1156 | unlock_unit (us); | |
1157 | return fd; | |
df65f093 SK |
1158 | } |
1159 | ||
1160 | ||
6de9cd9a DN |
1161 | /* unpack_filename()-- Given a fortran string and a pointer to a |
1162 | * buffer that is PATH_MAX characters, convert the fortran string to a | |
1163 | * C string in the buffer. Returns nonzero if this is not possible. */ | |
1164 | ||
10c682a0 | 1165 | int |
6de9cd9a DN |
1166 | unpack_filename (char *cstring, const char *fstring, int len) |
1167 | { | |
6de9cd9a DN |
1168 | len = fstrlen (fstring, len); |
1169 | if (len >= PATH_MAX) | |
1170 | return 1; | |
1171 | ||
1172 | memmove (cstring, fstring, len); | |
1173 | cstring[len] = '\0'; | |
1174 | ||
1175 | return 0; | |
1176 | } | |
1177 | ||
1178 | ||
1179 | /* tempfile()-- Generate a temporary filename for a scratch file and | |
1180 | * open it. mkstemp() opens the file for reading and writing, but the | |
1181 | * library mode prevents anything that is not allowed. The descriptor | |
41724e6a | 1182 | * is returned, which is -1 on error. The template is pointed to by |
5e805e44 | 1183 | * opp->file, which is copied into the unit structure |
6de9cd9a DN |
1184 | * and freed later. */ |
1185 | ||
1186 | static int | |
5e805e44 | 1187 | tempfile (st_parameter_open *opp) |
6de9cd9a DN |
1188 | { |
1189 | const char *tempdir; | |
1190 | char *template; | |
1191 | int fd; | |
1192 | ||
1193 | tempdir = getenv ("GFORTRAN_TMPDIR"); | |
1194 | if (tempdir == NULL) | |
1195 | tempdir = getenv ("TMP"); | |
e087fdd8 FXC |
1196 | if (tempdir == NULL) |
1197 | tempdir = getenv ("TEMP"); | |
6de9cd9a DN |
1198 | if (tempdir == NULL) |
1199 | tempdir = DEFAULT_TEMPDIR; | |
1200 | ||
1201 | template = get_mem (strlen (tempdir) + 20); | |
1202 | ||
d8163f5c | 1203 | sprintf (template, "%s/gfortrantmpXXXXXX", tempdir); |
41724e6a AL |
1204 | |
1205 | #ifdef HAVE_MKSTEMP | |
6de9cd9a DN |
1206 | |
1207 | fd = mkstemp (template); | |
1208 | ||
41724e6a AL |
1209 | #else /* HAVE_MKSTEMP */ |
1210 | ||
1211 | if (mktemp (template)) | |
1212 | do | |
8824fd4c | 1213 | #if defined(HAVE_CRLF) && defined(O_BINARY) |
3c127520 FXC |
1214 | fd = open (template, O_RDWR | O_CREAT | O_EXCL | O_BINARY, |
1215 | S_IREAD | S_IWRITE); | |
1216 | #else | |
e087fdd8 | 1217 | fd = open (template, O_RDWR | O_CREAT | O_EXCL, S_IREAD | S_IWRITE); |
3c127520 | 1218 | #endif |
41724e6a AL |
1219 | while (!(fd == -1 && errno == EEXIST) && mktemp (template)); |
1220 | else | |
1221 | fd = -1; | |
1222 | ||
1223 | #endif /* HAVE_MKSTEMP */ | |
1224 | ||
6de9cd9a DN |
1225 | if (fd < 0) |
1226 | free_mem (template); | |
1227 | else | |
1228 | { | |
5e805e44 JJ |
1229 | opp->file = template; |
1230 | opp->file_len = strlen (template); /* Don't include trailing nul */ | |
6de9cd9a DN |
1231 | } |
1232 | ||
1233 | return fd; | |
1234 | } | |
1235 | ||
1236 | ||
6ecf6dcb | 1237 | /* regular_file()-- Open a regular file. |
d02b2c64 TK |
1238 | * Change flags->action if it is ACTION_UNSPECIFIED on entry, |
1239 | * unless an error occurs. | |
6ecf6dcb | 1240 | * Returns the descriptor, which is less than zero on error. */ |
6de9cd9a DN |
1241 | |
1242 | static int | |
5e805e44 | 1243 | regular_file (st_parameter_open *opp, unit_flags *flags) |
6de9cd9a DN |
1244 | { |
1245 | char path[PATH_MAX + 1]; | |
6de9cd9a | 1246 | int mode; |
6ecf6dcb | 1247 | int rwflag; |
d02b2c64 | 1248 | int crflag; |
6ecf6dcb | 1249 | int fd; |
6de9cd9a | 1250 | |
5e805e44 | 1251 | if (unpack_filename (path, opp->file, opp->file_len)) |
6de9cd9a DN |
1252 | { |
1253 | errno = ENOENT; /* Fake an OS error */ | |
1254 | return -1; | |
1255 | } | |
1256 | ||
6ecf6dcb | 1257 | rwflag = 0; |
6de9cd9a | 1258 | |
6ecf6dcb | 1259 | switch (flags->action) |
6de9cd9a DN |
1260 | { |
1261 | case ACTION_READ: | |
6ecf6dcb | 1262 | rwflag = O_RDONLY; |
6de9cd9a DN |
1263 | break; |
1264 | ||
1265 | case ACTION_WRITE: | |
6ecf6dcb | 1266 | rwflag = O_WRONLY; |
6de9cd9a DN |
1267 | break; |
1268 | ||
1269 | case ACTION_READWRITE: | |
6ecf6dcb SE |
1270 | case ACTION_UNSPECIFIED: |
1271 | rwflag = O_RDWR; | |
6de9cd9a DN |
1272 | break; |
1273 | ||
1274 | default: | |
5e805e44 | 1275 | internal_error (&opp->common, "regular_file(): Bad action"); |
6de9cd9a DN |
1276 | } |
1277 | ||
6ecf6dcb | 1278 | switch (flags->status) |
6de9cd9a DN |
1279 | { |
1280 | case STATUS_NEW: | |
d02b2c64 | 1281 | crflag = O_CREAT | O_EXCL; |
6de9cd9a DN |
1282 | break; |
1283 | ||
d02b2c64 TK |
1284 | case STATUS_OLD: /* open will fail if the file does not exist*/ |
1285 | crflag = 0; | |
6de9cd9a DN |
1286 | break; |
1287 | ||
1288 | case STATUS_UNKNOWN: | |
1289 | case STATUS_SCRATCH: | |
d02b2c64 | 1290 | crflag = O_CREAT; |
6de9cd9a DN |
1291 | break; |
1292 | ||
1293 | case STATUS_REPLACE: | |
d70d13ac | 1294 | crflag = O_CREAT | O_TRUNC; |
6de9cd9a DN |
1295 | break; |
1296 | ||
1297 | default: | |
5e805e44 | 1298 | internal_error (&opp->common, "regular_file(): Bad status"); |
6de9cd9a DN |
1299 | } |
1300 | ||
6ecf6dcb | 1301 | /* rwflag |= O_LARGEFILE; */ |
6de9cd9a | 1302 | |
8824fd4c | 1303 | #if defined(HAVE_CRLF) && defined(O_BINARY) |
3c127520 FXC |
1304 | crflag |= O_BINARY; |
1305 | #endif | |
1306 | ||
6ecf6dcb | 1307 | mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH; |
d02b2c64 TK |
1308 | fd = open (path, rwflag | crflag, mode); |
1309 | if (flags->action != ACTION_UNSPECIFIED) | |
d70d13ac | 1310 | return fd; |
d02b2c64 TK |
1311 | |
1312 | if (fd >= 0) | |
6ecf6dcb | 1313 | { |
d02b2c64 TK |
1314 | flags->action = ACTION_READWRITE; |
1315 | return fd; | |
6ecf6dcb | 1316 | } |
d70d13ac | 1317 | if (errno != EACCES && errno != EROFS) |
d02b2c64 TK |
1318 | return fd; |
1319 | ||
1320 | /* retry for read-only access */ | |
1321 | rwflag = O_RDONLY; | |
1322 | fd = open (path, rwflag | crflag, mode); | |
1323 | if (fd >=0) | |
1324 | { | |
1325 | flags->action = ACTION_READ; | |
1326 | return fd; /* success */ | |
1327 | } | |
1328 | ||
1329 | if (errno != EACCES) | |
1330 | return fd; /* failure */ | |
1331 | ||
1332 | /* retry for write-only access */ | |
1333 | rwflag = O_WRONLY; | |
1334 | fd = open (path, rwflag | crflag, mode); | |
1335 | if (fd >=0) | |
1336 | { | |
1337 | flags->action = ACTION_WRITE; | |
1338 | return fd; /* success */ | |
1339 | } | |
1340 | return fd; /* failure */ | |
6de9cd9a DN |
1341 | } |
1342 | ||
1343 | ||
1344 | /* open_external()-- Open an external file, unix specific version. | |
6ecf6dcb | 1345 | * Change flags->action if it is ACTION_UNSPECIFIED on entry. |
6de9cd9a DN |
1346 | * Returns NULL on operating system error. */ |
1347 | ||
1348 | stream * | |
5e805e44 | 1349 | open_external (st_parameter_open *opp, unit_flags *flags) |
6de9cd9a DN |
1350 | { |
1351 | int fd, prot; | |
1352 | ||
6ecf6dcb SE |
1353 | if (flags->status == STATUS_SCRATCH) |
1354 | { | |
5e805e44 | 1355 | fd = tempfile (opp); |
6ecf6dcb SE |
1356 | if (flags->action == ACTION_UNSPECIFIED) |
1357 | flags->action = ACTION_READWRITE; | |
10c682a0 FXC |
1358 | |
1359 | #if HAVE_UNLINK_OPEN_FILE | |
6ecf6dcb | 1360 | /* We can unlink scratch files now and it will go away when closed. */ |
5e805e44 JJ |
1361 | if (fd >= 0) |
1362 | unlink (opp->file); | |
10c682a0 | 1363 | #endif |
6ecf6dcb SE |
1364 | } |
1365 | else | |
1366 | { | |
d02b2c64 TK |
1367 | /* regular_file resets flags->action if it is ACTION_UNSPECIFIED and |
1368 | * if it succeeds */ | |
5e805e44 | 1369 | fd = regular_file (opp, flags); |
6ecf6dcb | 1370 | } |
6de9cd9a DN |
1371 | |
1372 | if (fd < 0) | |
1373 | return NULL; | |
1374 | fd = fix_fd (fd); | |
1375 | ||
6ecf6dcb | 1376 | switch (flags->action) |
6de9cd9a DN |
1377 | { |
1378 | case ACTION_READ: | |
1379 | prot = PROT_READ; | |
1380 | break; | |
1381 | ||
1382 | case ACTION_WRITE: | |
1383 | prot = PROT_WRITE; | |
1384 | break; | |
1385 | ||
1386 | case ACTION_READWRITE: | |
1387 | prot = PROT_READ | PROT_WRITE; | |
1388 | break; | |
1389 | ||
1390 | default: | |
5e805e44 | 1391 | internal_error (&opp->common, "open_external(): Bad action"); |
6de9cd9a DN |
1392 | } |
1393 | ||
ca0d06ac | 1394 | return fd_to_stream (fd, prot); |
6de9cd9a DN |
1395 | } |
1396 | ||
1397 | ||
1398 | /* input_stream()-- Return a stream pointer to the default input stream. | |
1399 | * Called on initialization. */ | |
1400 | ||
1401 | stream * | |
1402 | input_stream (void) | |
1403 | { | |
ca0d06ac | 1404 | return fd_to_stream (STDIN_FILENO, PROT_READ); |
6de9cd9a DN |
1405 | } |
1406 | ||
1407 | ||
fbac3363 | 1408 | /* output_stream()-- Return a stream pointer to the default output stream. |
6de9cd9a DN |
1409 | * Called on initialization. */ |
1410 | ||
1411 | stream * | |
1412 | output_stream (void) | |
1413 | { | |
6a7c793f DS |
1414 | #if defined(HAVE_CRLF) && defined(HAVE_SETMODE) |
1415 | setmode (STDOUT_FILENO, O_BINARY); | |
1416 | #endif | |
ca0d06ac | 1417 | return fd_to_stream (STDOUT_FILENO, PROT_WRITE); |
6de9cd9a DN |
1418 | } |
1419 | ||
1420 | ||
fbac3363 DE |
1421 | /* error_stream()-- Return a stream pointer to the default error stream. |
1422 | * Called on initialization. */ | |
1423 | ||
1424 | stream * | |
1425 | error_stream (void) | |
1426 | { | |
6a7c793f DS |
1427 | #if defined(HAVE_CRLF) && defined(HAVE_SETMODE) |
1428 | setmode (STDERR_FILENO, O_BINARY); | |
1429 | #endif | |
ca0d06ac | 1430 | return fd_to_stream (STDERR_FILENO, PROT_WRITE); |
fbac3363 DE |
1431 | } |
1432 | ||
6de9cd9a | 1433 | |
d8163f5c TK |
1434 | /* st_vprintf()-- vprintf function for error output. To avoid buffer |
1435 | overruns, we limit the length of the buffer to ST_VPRINTF_SIZE. 2k | |
1436 | is big enough to completely fill a 80x25 terminal, so it shuld be | |
1437 | OK. We use a direct write() because it is simpler and least likely | |
f353733a TK |
1438 | to be clobbered by memory corruption. Writing an error message |
1439 | longer than that is an error. */ | |
6de9cd9a | 1440 | |
d8163f5c | 1441 | #define ST_VPRINTF_SIZE 2048 |
6de9cd9a | 1442 | |
d8163f5c TK |
1443 | int |
1444 | st_vprintf (const char *format, va_list ap) | |
1445 | { | |
1446 | static char buffer[ST_VPRINTF_SIZE]; | |
1447 | int written; | |
1448 | int fd; | |
6de9cd9a | 1449 | |
d8163f5c TK |
1450 | fd = options.use_stderr ? STDERR_FILENO : STDOUT_FILENO; |
1451 | #ifdef HAVE_VSNPRINTF | |
1452 | written = vsnprintf(buffer, ST_VPRINTF_SIZE, format, ap); | |
1453 | #else | |
f353733a TK |
1454 | written = vsprintf(buffer, format, ap); |
1455 | ||
1456 | if (written >= ST_VPRINTF_SIZE-1) | |
1457 | { | |
1458 | /* The error message was longer than our buffer. Ouch. Because | |
1459 | we may have messed up things badly, report the error and | |
1460 | quit. */ | |
1461 | #define ERROR_MESSAGE "Internal error: buffer overrun in st_vprintf()\n" | |
1462 | write (fd, buffer, ST_VPRINTF_SIZE-1); | |
1463 | write (fd, ERROR_MESSAGE, strlen(ERROR_MESSAGE)); | |
1464 | sys_exit(2); | |
1465 | #undef ERROR_MESSAGE | |
1466 | ||
1467 | } | |
d8163f5c | 1468 | #endif |
f353733a | 1469 | |
d8163f5c TK |
1470 | written = write (fd, buffer, written); |
1471 | return written; | |
6de9cd9a DN |
1472 | } |
1473 | ||
d8163f5c TK |
1474 | /* st_printf()-- printf() function for error output. This just calls |
1475 | st_vprintf() to do the actual work. */ | |
0dce3ca1 FXC |
1476 | |
1477 | int | |
1478 | st_printf (const char *format, ...) | |
1479 | { | |
d8163f5c TK |
1480 | int written; |
1481 | va_list ap; | |
1482 | va_start (ap, format); | |
1483 | written = st_vprintf(format, ap); | |
1484 | va_end (ap); | |
1485 | return written; | |
0dce3ca1 FXC |
1486 | } |
1487 | ||
6de9cd9a DN |
1488 | |
1489 | /* compare_file_filename()-- Given an open stream and a fortran string | |
1490 | * that is a filename, figure out if the file is the same as the | |
1491 | * filename. */ | |
1492 | ||
1493 | int | |
ad238e4f | 1494 | compare_file_filename (gfc_unit *u, const char *name, int len) |
6de9cd9a DN |
1495 | { |
1496 | char path[PATH_MAX + 1]; | |
ad238e4f FXC |
1497 | struct stat st1; |
1498 | #ifdef HAVE_WORKING_STAT | |
1499 | struct stat st2; | |
fe046210 FXC |
1500 | #else |
1501 | # ifdef __MINGW32__ | |
1502 | uint64_t id1, id2; | |
1503 | # endif | |
ad238e4f | 1504 | #endif |
6de9cd9a DN |
1505 | |
1506 | if (unpack_filename (path, name, len)) | |
1507 | return 0; /* Can't be the same */ | |
1508 | ||
1509 | /* If the filename doesn't exist, then there is no match with the | |
1510 | * existing file. */ | |
1511 | ||
1512 | if (stat (path, &st1) < 0) | |
1513 | return 0; | |
1514 | ||
ad238e4f FXC |
1515 | #ifdef HAVE_WORKING_STAT |
1516 | fstat (((unix_stream *) (u->s))->fd, &st2); | |
6de9cd9a | 1517 | return (st1.st_dev == st2.st_dev) && (st1.st_ino == st2.st_ino); |
ad238e4f | 1518 | #else |
fe046210 FXC |
1519 | |
1520 | # ifdef __MINGW32__ | |
1521 | /* We try to match files by a unique ID. On some filesystems (network | |
1522 | fs and FAT), we can't generate this unique ID, and will simply compare | |
1523 | filenames. */ | |
1524 | id1 = id_from_path (path); | |
1525 | id2 = id_from_fd (((unix_stream *) (u->s))->fd); | |
1526 | if (id1 || id2) | |
1527 | return (id1 == id2); | |
1528 | # endif | |
1529 | ||
ad238e4f FXC |
1530 | if (len != u->file_len) |
1531 | return 0; | |
1532 | return (memcmp(path, u->file, len) == 0); | |
1533 | #endif | |
6de9cd9a DN |
1534 | } |
1535 | ||
1536 | ||
5e805e44 JJ |
1537 | #ifdef HAVE_WORKING_STAT |
1538 | # define FIND_FILE0_DECL struct stat *st | |
1539 | # define FIND_FILE0_ARGS st | |
1540 | #else | |
fe046210 FXC |
1541 | # define FIND_FILE0_DECL uint64_t id, const char *file, gfc_charlen_type file_len |
1542 | # define FIND_FILE0_ARGS id, file, file_len | |
5e805e44 JJ |
1543 | #endif |
1544 | ||
6de9cd9a DN |
1545 | /* find_file0()-- Recursive work function for find_file() */ |
1546 | ||
909087e0 | 1547 | static gfc_unit * |
5e805e44 | 1548 | find_file0 (gfc_unit *u, FIND_FILE0_DECL) |
6de9cd9a | 1549 | { |
909087e0 | 1550 | gfc_unit *v; |
fe046210 FXC |
1551 | #if defined(__MINGW32__) && !HAVE_WORKING_STAT |
1552 | uint64_t id1; | |
1553 | #endif | |
6de9cd9a DN |
1554 | |
1555 | if (u == NULL) | |
1556 | return NULL; | |
1557 | ||
ad238e4f | 1558 | #ifdef HAVE_WORKING_STAT |
5e805e44 JJ |
1559 | if (u->s != NULL |
1560 | && fstat (((unix_stream *) u->s)->fd, &st[1]) >= 0 && | |
1561 | st[0].st_dev == st[1].st_dev && st[0].st_ino == st[1].st_ino) | |
6de9cd9a | 1562 | return u; |
ad238e4f | 1563 | #else |
fe046210 FXC |
1564 | # ifdef __MINGW32__ |
1565 | if (u->s && ((id1 = id_from_fd (((unix_stream *) u->s)->fd)) || id1)) | |
1566 | { | |
1567 | if (id == id1) | |
1568 | return u; | |
1569 | } | |
1570 | else | |
1571 | # endif | |
1572 | if (compare_string (u->file_len, u->file, file_len, file) == 0) | |
1573 | return u; | |
ad238e4f | 1574 | #endif |
6de9cd9a | 1575 | |
5e805e44 | 1576 | v = find_file0 (u->left, FIND_FILE0_ARGS); |
6de9cd9a DN |
1577 | if (v != NULL) |
1578 | return v; | |
1579 | ||
5e805e44 | 1580 | v = find_file0 (u->right, FIND_FILE0_ARGS); |
6de9cd9a DN |
1581 | if (v != NULL) |
1582 | return v; | |
1583 | ||
1584 | return NULL; | |
1585 | } | |
1586 | ||
1587 | ||
1588 | /* find_file()-- Take the current filename and see if there is a unit | |
1589 | * that has the file already open. Returns a pointer to the unit if so. */ | |
1590 | ||
909087e0 | 1591 | gfc_unit * |
5e805e44 | 1592 | find_file (const char *file, gfc_charlen_type file_len) |
6de9cd9a DN |
1593 | { |
1594 | char path[PATH_MAX + 1]; | |
5e805e44 JJ |
1595 | struct stat st[2]; |
1596 | gfc_unit *u; | |
fe046210 | 1597 | uint64_t id; |
6de9cd9a | 1598 | |
5e805e44 | 1599 | if (unpack_filename (path, file, file_len)) |
6de9cd9a DN |
1600 | return NULL; |
1601 | ||
5e805e44 | 1602 | if (stat (path, &st[0]) < 0) |
6de9cd9a DN |
1603 | return NULL; |
1604 | ||
fe046210 FXC |
1605 | #if defined(__MINGW32__) && !HAVE_WORKING_STAT |
1606 | id = id_from_path (path); | |
1607 | #else | |
1608 | id = 0; | |
1609 | #endif | |
1610 | ||
5e805e44 JJ |
1611 | __gthread_mutex_lock (&unit_lock); |
1612 | retry: | |
1613 | u = find_file0 (unit_root, FIND_FILE0_ARGS); | |
1614 | if (u != NULL) | |
1615 | { | |
1616 | /* Fast path. */ | |
1617 | if (! __gthread_mutex_trylock (&u->lock)) | |
1618 | { | |
1619 | /* assert (u->closed == 0); */ | |
1620 | __gthread_mutex_unlock (&unit_lock); | |
1621 | return u; | |
1622 | } | |
1623 | ||
1624 | inc_waiting_locked (u); | |
1625 | } | |
1626 | __gthread_mutex_unlock (&unit_lock); | |
1627 | if (u != NULL) | |
1628 | { | |
1629 | __gthread_mutex_lock (&u->lock); | |
1630 | if (u->closed) | |
1631 | { | |
1632 | __gthread_mutex_lock (&unit_lock); | |
1633 | __gthread_mutex_unlock (&u->lock); | |
1634 | if (predec_waiting_locked (u) == 0) | |
1635 | free_mem (u); | |
1636 | goto retry; | |
1637 | } | |
1638 | ||
1639 | dec_waiting_unlocked (u); | |
1640 | } | |
1641 | return u; | |
1642 | } | |
1643 | ||
1644 | static gfc_unit * | |
1645 | flush_all_units_1 (gfc_unit *u, int min_unit) | |
1646 | { | |
1647 | while (u != NULL) | |
1648 | { | |
1649 | if (u->unit_number > min_unit) | |
1650 | { | |
1651 | gfc_unit *r = flush_all_units_1 (u->left, min_unit); | |
1652 | if (r != NULL) | |
1653 | return r; | |
1654 | } | |
1655 | if (u->unit_number >= min_unit) | |
1656 | { | |
1657 | if (__gthread_mutex_trylock (&u->lock)) | |
1658 | return u; | |
1659 | if (u->s) | |
1660 | flush (u->s); | |
1661 | __gthread_mutex_unlock (&u->lock); | |
1662 | } | |
1663 | u = u->right; | |
1664 | } | |
1665 | return NULL; | |
1666 | } | |
1667 | ||
1668 | void | |
1669 | flush_all_units (void) | |
1670 | { | |
1671 | gfc_unit *u; | |
1672 | int min_unit = 0; | |
1673 | ||
1674 | __gthread_mutex_lock (&unit_lock); | |
1675 | do | |
1676 | { | |
1677 | u = flush_all_units_1 (unit_root, min_unit); | |
1678 | if (u != NULL) | |
1679 | inc_waiting_locked (u); | |
1680 | __gthread_mutex_unlock (&unit_lock); | |
1681 | if (u == NULL) | |
1682 | return; | |
1683 | ||
1684 | __gthread_mutex_lock (&u->lock); | |
1685 | ||
1686 | min_unit = u->unit_number + 1; | |
1687 | ||
1688 | if (u->closed == 0) | |
1689 | { | |
1690 | flush (u->s); | |
1691 | __gthread_mutex_lock (&unit_lock); | |
1692 | __gthread_mutex_unlock (&u->lock); | |
1693 | (void) predec_waiting_locked (u); | |
1694 | } | |
1695 | else | |
1696 | { | |
1697 | __gthread_mutex_lock (&unit_lock); | |
1698 | __gthread_mutex_unlock (&u->lock); | |
1699 | if (predec_waiting_locked (u) == 0) | |
1700 | free_mem (u); | |
1701 | } | |
1702 | } | |
1703 | while (1); | |
6de9cd9a DN |
1704 | } |
1705 | ||
1706 | ||
1707 | /* stream_at_bof()-- Returns nonzero if the stream is at the beginning | |
1708 | * of the file. */ | |
1709 | ||
1710 | int | |
1711 | stream_at_bof (stream * s) | |
1712 | { | |
1713 | unix_stream *us; | |
1714 | ||
b68d2bed JB |
1715 | if (!is_seekable (s)) |
1716 | return 0; | |
6de9cd9a | 1717 | |
b68d2bed | 1718 | us = (unix_stream *) s; |
6de9cd9a DN |
1719 | |
1720 | return us->logical_offset == 0; | |
1721 | } | |
1722 | ||
1723 | ||
8824fd4c | 1724 | /* stream_at_eof()-- Returns nonzero if the stream is at the end |
6de9cd9a DN |
1725 | * of the file. */ |
1726 | ||
1727 | int | |
1728 | stream_at_eof (stream * s) | |
1729 | { | |
1730 | unix_stream *us; | |
1731 | ||
b68d2bed JB |
1732 | if (!is_seekable (s)) |
1733 | return 0; | |
6de9cd9a | 1734 | |
b68d2bed | 1735 | us = (unix_stream *) s; |
6de9cd9a DN |
1736 | |
1737 | return us->logical_offset == us->dirty_offset; | |
1738 | } | |
1739 | ||
1740 | ||
1741 | /* delete_file()-- Given a unit structure, delete the file associated | |
1742 | * with the unit. Returns nonzero if something went wrong. */ | |
1743 | ||
1744 | int | |
909087e0 | 1745 | delete_file (gfc_unit * u) |
6de9cd9a DN |
1746 | { |
1747 | char path[PATH_MAX + 1]; | |
1748 | ||
1749 | if (unpack_filename (path, u->file, u->file_len)) | |
1750 | { /* Shouldn't be possible */ | |
1751 | errno = ENOENT; | |
1752 | return 1; | |
1753 | } | |
1754 | ||
1755 | return unlink (path); | |
1756 | } | |
1757 | ||
1758 | ||
1759 | /* file_exists()-- Returns nonzero if the current filename exists on | |
1760 | * the system */ | |
1761 | ||
1762 | int | |
5e805e44 | 1763 | file_exists (const char *file, gfc_charlen_type file_len) |
6de9cd9a DN |
1764 | { |
1765 | char path[PATH_MAX + 1]; | |
1766 | struct stat statbuf; | |
1767 | ||
5e805e44 | 1768 | if (unpack_filename (path, file, file_len)) |
6de9cd9a DN |
1769 | return 0; |
1770 | ||
1771 | if (stat (path, &statbuf) < 0) | |
1772 | return 0; | |
1773 | ||
1774 | return 1; | |
1775 | } | |
1776 | ||
1777 | ||
1778 | ||
09003779 | 1779 | static const char yes[] = "YES", no[] = "NO", unknown[] = "UNKNOWN"; |
6de9cd9a DN |
1780 | |
1781 | /* inquire_sequential()-- Given a fortran string, determine if the | |
1782 | * file is suitable for sequential access. Returns a C-style | |
1783 | * string. */ | |
1784 | ||
1785 | const char * | |
1786 | inquire_sequential (const char *string, int len) | |
1787 | { | |
1788 | char path[PATH_MAX + 1]; | |
1789 | struct stat statbuf; | |
1790 | ||
1791 | if (string == NULL || | |
1792 | unpack_filename (path, string, len) || stat (path, &statbuf) < 0) | |
1793 | return unknown; | |
1794 | ||
1795 | if (S_ISREG (statbuf.st_mode) || | |
1796 | S_ISCHR (statbuf.st_mode) || S_ISFIFO (statbuf.st_mode)) | |
1797 | return yes; | |
1798 | ||
1799 | if (S_ISDIR (statbuf.st_mode) || S_ISBLK (statbuf.st_mode)) | |
1800 | return no; | |
1801 | ||
1802 | return unknown; | |
1803 | } | |
1804 | ||
1805 | ||
1806 | /* inquire_direct()-- Given a fortran string, determine if the file is | |
1807 | * suitable for direct access. Returns a C-style string. */ | |
1808 | ||
1809 | const char * | |
1810 | inquire_direct (const char *string, int len) | |
1811 | { | |
1812 | char path[PATH_MAX + 1]; | |
1813 | struct stat statbuf; | |
1814 | ||
1815 | if (string == NULL || | |
1816 | unpack_filename (path, string, len) || stat (path, &statbuf) < 0) | |
1817 | return unknown; | |
1818 | ||
1819 | if (S_ISREG (statbuf.st_mode) || S_ISBLK (statbuf.st_mode)) | |
1820 | return yes; | |
1821 | ||
1822 | if (S_ISDIR (statbuf.st_mode) || | |
1823 | S_ISCHR (statbuf.st_mode) || S_ISFIFO (statbuf.st_mode)) | |
1824 | return no; | |
1825 | ||
1826 | return unknown; | |
1827 | } | |
1828 | ||
1829 | ||
1830 | /* inquire_formatted()-- Given a fortran string, determine if the file | |
1831 | * is suitable for formatted form. Returns a C-style string. */ | |
1832 | ||
1833 | const char * | |
1834 | inquire_formatted (const char *string, int len) | |
1835 | { | |
1836 | char path[PATH_MAX + 1]; | |
1837 | struct stat statbuf; | |
1838 | ||
1839 | if (string == NULL || | |
1840 | unpack_filename (path, string, len) || stat (path, &statbuf) < 0) | |
1841 | return unknown; | |
1842 | ||
1843 | if (S_ISREG (statbuf.st_mode) || | |
1844 | S_ISBLK (statbuf.st_mode) || | |
1845 | S_ISCHR (statbuf.st_mode) || S_ISFIFO (statbuf.st_mode)) | |
1846 | return yes; | |
1847 | ||
1848 | if (S_ISDIR (statbuf.st_mode)) | |
1849 | return no; | |
1850 | ||
1851 | return unknown; | |
1852 | } | |
1853 | ||
1854 | ||
1855 | /* inquire_unformatted()-- Given a fortran string, determine if the file | |
1856 | * is suitable for unformatted form. Returns a C-style string. */ | |
1857 | ||
1858 | const char * | |
1859 | inquire_unformatted (const char *string, int len) | |
1860 | { | |
6de9cd9a DN |
1861 | return inquire_formatted (string, len); |
1862 | } | |
1863 | ||
1864 | ||
2515e5a7 FXC |
1865 | #ifndef HAVE_ACCESS |
1866 | ||
1867 | #ifndef W_OK | |
1868 | #define W_OK 2 | |
1869 | #endif | |
1870 | ||
1871 | #ifndef R_OK | |
1872 | #define R_OK 4 | |
1873 | #endif | |
1874 | ||
1875 | /* Fallback implementation of access() on systems that don't have it. | |
1876 | Only modes R_OK and W_OK are used in this file. */ | |
1877 | ||
1878 | static int | |
1879 | fallback_access (const char *path, int mode) | |
1880 | { | |
1881 | if ((mode & R_OK) && open (path, O_RDONLY) < 0) | |
1882 | return -1; | |
1883 | ||
1884 | if ((mode & W_OK) && open (path, O_WRONLY) < 0) | |
1885 | return -1; | |
1886 | ||
1887 | return 0; | |
1888 | } | |
1889 | ||
1890 | #undef access | |
1891 | #define access fallback_access | |
1892 | #endif | |
1893 | ||
1894 | ||
6de9cd9a DN |
1895 | /* inquire_access()-- Given a fortran string, determine if the file is |
1896 | * suitable for access. */ | |
1897 | ||
1898 | static const char * | |
1899 | inquire_access (const char *string, int len, int mode) | |
1900 | { | |
1901 | char path[PATH_MAX + 1]; | |
1902 | ||
1903 | if (string == NULL || unpack_filename (path, string, len) || | |
1904 | access (path, mode) < 0) | |
1905 | return no; | |
1906 | ||
1907 | return yes; | |
1908 | } | |
1909 | ||
1910 | ||
1911 | /* inquire_read()-- Given a fortran string, determine if the file is | |
1912 | * suitable for READ access. */ | |
1913 | ||
1914 | const char * | |
1915 | inquire_read (const char *string, int len) | |
1916 | { | |
6de9cd9a DN |
1917 | return inquire_access (string, len, R_OK); |
1918 | } | |
1919 | ||
1920 | ||
1921 | /* inquire_write()-- Given a fortran string, determine if the file is | |
1922 | * suitable for READ access. */ | |
1923 | ||
1924 | const char * | |
1925 | inquire_write (const char *string, int len) | |
1926 | { | |
6de9cd9a DN |
1927 | return inquire_access (string, len, W_OK); |
1928 | } | |
1929 | ||
1930 | ||
1931 | /* inquire_readwrite()-- Given a fortran string, determine if the file is | |
1932 | * suitable for read and write access. */ | |
1933 | ||
1934 | const char * | |
1935 | inquire_readwrite (const char *string, int len) | |
1936 | { | |
6de9cd9a DN |
1937 | return inquire_access (string, len, R_OK | W_OK); |
1938 | } | |
1939 | ||
1940 | ||
1941 | /* file_length()-- Return the file length in bytes, -1 if unknown */ | |
1942 | ||
81f4be3c | 1943 | gfc_offset |
6de9cd9a DN |
1944 | file_length (stream * s) |
1945 | { | |
6de9cd9a DN |
1946 | return ((unix_stream *) s)->file_length; |
1947 | } | |
1948 | ||
1949 | ||
1950 | /* file_position()-- Return the current position of the file */ | |
1951 | ||
81f4be3c | 1952 | gfc_offset |
7ab8aa36 | 1953 | file_position (stream *s) |
6de9cd9a | 1954 | { |
6de9cd9a DN |
1955 | return ((unix_stream *) s)->logical_offset; |
1956 | } | |
1957 | ||
1958 | ||
1959 | /* is_seekable()-- Return nonzero if the stream is seekable, zero if | |
1960 | * it is not */ | |
1961 | ||
1962 | int | |
7ab8aa36 | 1963 | is_seekable (stream *s) |
6de9cd9a | 1964 | { |
0dc43461 JB |
1965 | /* By convention, if file_length == -1, the file is not |
1966 | seekable. */ | |
bf1df0a0 | 1967 | return ((unix_stream *) s)->file_length!=-1; |
6de9cd9a DN |
1968 | } |
1969 | ||
7ab8aa36 JD |
1970 | |
1971 | /* is_special()-- Return nonzero if the stream is not a regular file. */ | |
1972 | ||
9a7b6ea7 | 1973 | int |
7ab8aa36 JD |
1974 | is_special (stream *s) |
1975 | { | |
1976 | return ((unix_stream *) s)->special_file; | |
1977 | } | |
1978 | ||
1979 | ||
000aa32a JB |
1980 | try |
1981 | flush (stream *s) | |
1982 | { | |
1983 | return fd_flush( (unix_stream *) s); | |
1984 | } | |
1985 | ||
ae8b8789 FXC |
1986 | int |
1987 | stream_isatty (stream *s) | |
1988 | { | |
1989 | return isatty (((unix_stream *) s)->fd); | |
1990 | } | |
1991 | ||
1992 | char * | |
008afe51 | 1993 | stream_ttyname (stream *s __attribute__ ((unused))) |
ae8b8789 | 1994 | { |
8845001b | 1995 | #ifdef HAVE_TTYNAME |
ae8b8789 | 1996 | return ttyname (((unix_stream *) s)->fd); |
8845001b FXC |
1997 | #else |
1998 | return NULL; | |
1999 | #endif | |
ae8b8789 FXC |
2000 | } |
2001 | ||
5d723e54 FXC |
2002 | gfc_offset |
2003 | stream_offset (stream *s) | |
2004 | { | |
2005 | return (((unix_stream *) s)->logical_offset); | |
2006 | } | |
2007 | ||
6de9cd9a DN |
2008 | |
2009 | /* How files are stored: This is an operating-system specific issue, | |
2010 | and therefore belongs here. There are three cases to consider. | |
2011 | ||
2012 | Direct Access: | |
2013 | Records are written as block of bytes corresponding to the record | |
2014 | length of the file. This goes for both formatted and unformatted | |
2015 | records. Positioning is done explicitly for each data transfer, | |
2016 | so positioning is not much of an issue. | |
2017 | ||
2018 | Sequential Formatted: | |
2019 | Records are separated by newline characters. The newline character | |
2020 | is prohibited from appearing in a string. If it does, this will be | |
2021 | messed up on the next read. End of file is also the end of a record. | |
2022 | ||
2023 | Sequential Unformatted: | |
2024 | In this case, we are merely copying bytes to and from main storage, | |
2025 | yet we need to keep track of varying record lengths. We adopt | |
2026 | the solution used by f2c. Each record contains a pair of length | |
2027 | markers: | |
2028 | ||
2029 | Length of record n in bytes | |
2030 | Data of record n | |
2031 | Length of record n in bytes | |
2032 | ||
2033 | Length of record n+1 in bytes | |
2034 | Data of record n+1 | |
2035 | Length of record n+1 in bytes | |
2036 | ||
2037 | The length is stored at the end of a record to allow backspacing to the | |
2038 | previous record. Between data transfer statements, the file pointer | |
2039 | is left pointing to the first length of the current record. | |
2040 | ||
2041 | ENDFILE records are never explicitly stored. | |
2042 | ||
2043 | */ |