1 | /* Copyright (C) 1993-2016 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. |
17 | |
18 | As a special exception, if you link the code in this file with |
19 | files compiled with a GNU compiler to produce an executable, |
20 | that does not cause the resulting executable to be covered by |
21 | the GNU Lesser General Public License. This exception does not |
22 | however invalidate any other reasons why the executable file |
23 | might be covered by the GNU Lesser General Public License. |
24 | This exception applies to code released by its copyright holders |
25 | in files containing the exception. */ |
26 | |
27 | /* Generic or default I/O operations. */ |
28 | |
29 | #include "libioP.h" |
30 | #include <stdlib.h> |
31 | #include <string.h> |
32 | #include <stdbool.h> |
33 | #ifdef _LIBC |
34 | #include <sched.h> |
35 | #endif |
36 | |
37 | #ifdef _IO_MTSAFE_IO |
38 | static _IO_lock_t list_all_lock = _IO_lock_initializer; |
39 | #endif |
40 | |
41 | /* Used to signal modifications to the list of FILE decriptors. */ |
42 | static int _IO_list_all_stamp; |
43 | |
44 | |
45 | static _IO_FILE *run_fp; |
46 | |
47 | #ifdef _IO_MTSAFE_IO |
48 | static void |
49 | flush_cleanup (void *not_used) |
50 | { |
51 | if (run_fp != NULL) |
52 | _IO_funlockfile (run_fp); |
53 | _IO_lock_unlock (list_all_lock); |
54 | } |
55 | #endif |
56 | |
57 | void |
58 | _IO_un_link (struct _IO_FILE_plus *fp) |
59 | { |
60 | if (fp->file._flags & _IO_LINKED) |
61 | { |
62 | struct _IO_FILE **f; |
63 | #ifdef _IO_MTSAFE_IO |
64 | _IO_cleanup_region_start_noarg (flush_cleanup); |
65 | _IO_lock_lock (list_all_lock); |
66 | run_fp = (_IO_FILE *) fp; |
67 | _IO_flockfile ((_IO_FILE *) fp); |
68 | #endif |
69 | if (_IO_list_all == NULL) |
70 | ; |
71 | else if (fp == _IO_list_all) |
72 | { |
73 | _IO_list_all = (struct _IO_FILE_plus *) _IO_list_all->file._chain; |
74 | ++_IO_list_all_stamp; |
75 | } |
76 | else |
77 | for (f = &_IO_list_all->file._chain; *f; f = &(*f)->_chain) |
78 | if (*f == (_IO_FILE *) fp) |
79 | { |
80 | *f = fp->file._chain; |
81 | ++_IO_list_all_stamp; |
82 | break; |
83 | } |
84 | fp->file._flags &= ~_IO_LINKED; |
85 | #ifdef _IO_MTSAFE_IO |
86 | _IO_funlockfile ((_IO_FILE *) fp); |
87 | run_fp = NULL; |
88 | _IO_lock_unlock (list_all_lock); |
89 | _IO_cleanup_region_end (0); |
90 | #endif |
91 | } |
92 | } |
93 | libc_hidden_def (_IO_un_link) |
94 | |
95 | void |
96 | _IO_link_in (struct _IO_FILE_plus *fp) |
97 | { |
98 | if ((fp->file._flags & _IO_LINKED) == 0) |
99 | { |
100 | fp->file._flags |= _IO_LINKED; |
101 | #ifdef _IO_MTSAFE_IO |
102 | _IO_cleanup_region_start_noarg (flush_cleanup); |
103 | _IO_lock_lock (list_all_lock); |
104 | run_fp = (_IO_FILE *) fp; |
105 | _IO_flockfile ((_IO_FILE *) fp); |
106 | #endif |
107 | fp->file._chain = (_IO_FILE *) _IO_list_all; |
108 | _IO_list_all = fp; |
109 | ++_IO_list_all_stamp; |
110 | #ifdef _IO_MTSAFE_IO |
111 | _IO_funlockfile ((_IO_FILE *) fp); |
112 | run_fp = NULL; |
113 | _IO_lock_unlock (list_all_lock); |
114 | _IO_cleanup_region_end (0); |
115 | #endif |
116 | } |
117 | } |
118 | libc_hidden_def (_IO_link_in) |
119 | |
120 | /* Return minimum _pos markers |
121 | Assumes the current get area is the main get area. */ |
122 | _IO_ssize_t _IO_least_marker (_IO_FILE *fp, char *end_p); |
123 | |
124 | _IO_ssize_t |
125 | _IO_least_marker (_IO_FILE *fp, char *end_p) |
126 | { |
127 | _IO_ssize_t least_so_far = end_p - fp->_IO_read_base; |
128 | struct _IO_marker *mark; |
129 | for (mark = fp->_markers; mark != NULL; mark = mark->_next) |
130 | if (mark->_pos < least_so_far) |
131 | least_so_far = mark->_pos; |
132 | return least_so_far; |
133 | } |
134 | |
135 | /* Switch current get area from backup buffer to (start of) main get area. */ |
136 | |
137 | void |
138 | _IO_switch_to_main_get_area (_IO_FILE *fp) |
139 | { |
140 | char *tmp; |
141 | fp->_flags &= ~_IO_IN_BACKUP; |
142 | /* Swap _IO_read_end and _IO_save_end. */ |
143 | tmp = fp->_IO_read_end; |
144 | fp->_IO_read_end = fp->_IO_save_end; |
145 | fp->_IO_save_end= tmp; |
146 | /* Swap _IO_read_base and _IO_save_base. */ |
147 | tmp = fp->_IO_read_base; |
148 | fp->_IO_read_base = fp->_IO_save_base; |
149 | fp->_IO_save_base = tmp; |
150 | /* Set _IO_read_ptr. */ |
151 | fp->_IO_read_ptr = fp->_IO_read_base; |
152 | } |
153 | |
154 | /* Switch current get area from main get area to (end of) backup area. */ |
155 | |
156 | void |
157 | _IO_switch_to_backup_area (_IO_FILE *fp) |
158 | { |
159 | char *tmp; |
160 | fp->_flags |= _IO_IN_BACKUP; |
161 | /* Swap _IO_read_end and _IO_save_end. */ |
162 | tmp = fp->_IO_read_end; |
163 | fp->_IO_read_end = fp->_IO_save_end; |
164 | fp->_IO_save_end = tmp; |
165 | /* Swap _IO_read_base and _IO_save_base. */ |
166 | tmp = fp->_IO_read_base; |
167 | fp->_IO_read_base = fp->_IO_save_base; |
168 | fp->_IO_save_base = tmp; |
169 | /* Set _IO_read_ptr. */ |
170 | fp->_IO_read_ptr = fp->_IO_read_end; |
171 | } |
172 | |
173 | int |
174 | _IO_switch_to_get_mode (_IO_FILE *fp) |
175 | { |
176 | if (fp->_IO_write_ptr > fp->_IO_write_base) |
177 | if (_IO_OVERFLOW (fp, EOF) == EOF) |
178 | return EOF; |
179 | if (_IO_in_backup (fp)) |
180 | fp->_IO_read_base = fp->_IO_backup_base; |
181 | else |
182 | { |
183 | fp->_IO_read_base = fp->_IO_buf_base; |
184 | if (fp->_IO_write_ptr > fp->_IO_read_end) |
185 | fp->_IO_read_end = fp->_IO_write_ptr; |
186 | } |
187 | fp->_IO_read_ptr = fp->_IO_write_ptr; |
188 | |
189 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end = fp->_IO_read_ptr; |
190 | |
191 | fp->_flags &= ~_IO_CURRENTLY_PUTTING; |
192 | return 0; |
193 | } |
194 | libc_hidden_def (_IO_switch_to_get_mode) |
195 | |
196 | void |
197 | _IO_free_backup_area (_IO_FILE *fp) |
198 | { |
199 | if (_IO_in_backup (fp)) |
200 | _IO_switch_to_main_get_area (fp); /* Just in case. */ |
201 | free (fp->_IO_save_base); |
202 | fp->_IO_save_base = NULL; |
203 | fp->_IO_save_end = NULL; |
204 | fp->_IO_backup_base = NULL; |
205 | } |
206 | libc_hidden_def (_IO_free_backup_area) |
207 | |
208 | #if 0 |
209 | int |
210 | _IO_switch_to_put_mode (_IO_FILE *fp) |
211 | { |
212 | fp->_IO_write_base = fp->_IO_read_ptr; |
213 | fp->_IO_write_ptr = fp->_IO_read_ptr; |
214 | /* Following is wrong if line- or un-buffered? */ |
215 | fp->_IO_write_end = (fp->_flags & _IO_IN_BACKUP |
216 | ? fp->_IO_read_end : fp->_IO_buf_end); |
217 | |
218 | fp->_IO_read_ptr = fp->_IO_read_end; |
219 | fp->_IO_read_base = fp->_IO_read_end; |
220 | |
221 | fp->_flags |= _IO_CURRENTLY_PUTTING; |
222 | return 0; |
223 | } |
224 | #endif |
225 | |
226 | int |
227 | __overflow (_IO_FILE *f, int ch) |
228 | { |
229 | /* This is a single-byte stream. */ |
230 | if (f->_mode == 0) |
231 | _IO_fwide (f, -1); |
232 | return _IO_OVERFLOW (f, ch); |
233 | } |
234 | libc_hidden_def (__overflow) |
235 | |
236 | static int save_for_backup (_IO_FILE *fp, char *end_p) |
237 | #ifdef _LIBC |
238 | internal_function |
239 | #endif |
240 | ; |
241 | |
242 | static int |
243 | #ifdef _LIBC |
244 | internal_function |
245 | #endif |
246 | save_for_backup (_IO_FILE *fp, char *end_p) |
247 | { |
248 | /* Append [_IO_read_base..end_p] to backup area. */ |
249 | _IO_ssize_t least_mark = _IO_least_marker (fp, end_p); |
250 | /* needed_size is how much space we need in the backup area. */ |
251 | _IO_size_t needed_size = (end_p - fp->_IO_read_base) - least_mark; |
252 | /* FIXME: Dubious arithmetic if pointers are NULL */ |
253 | _IO_size_t current_Bsize = fp->_IO_save_end - fp->_IO_save_base; |
254 | _IO_size_t avail; /* Extra space available for future expansion. */ |
255 | _IO_ssize_t delta; |
256 | struct _IO_marker *mark; |
257 | if (needed_size > current_Bsize) |
258 | { |
259 | char *new_buffer; |
260 | avail = 100; |
261 | new_buffer = (char *) malloc (avail + needed_size); |
262 | if (new_buffer == NULL) |
263 | return EOF; /* FIXME */ |
264 | if (least_mark < 0) |
265 | { |
266 | #ifdef _LIBC |
267 | __mempcpy (__mempcpy (new_buffer + avail, |
268 | fp->_IO_save_end + least_mark, |
269 | -least_mark), |
270 | fp->_IO_read_base, |
271 | end_p - fp->_IO_read_base); |
272 | #else |
273 | memcpy (new_buffer + avail, |
274 | fp->_IO_save_end + least_mark, |
275 | -least_mark); |
276 | memcpy (new_buffer + avail - least_mark, |
277 | fp->_IO_read_base, |
278 | end_p - fp->_IO_read_base); |
279 | #endif |
280 | } |
281 | else |
282 | memcpy (new_buffer + avail, |
283 | fp->_IO_read_base + least_mark, |
284 | needed_size); |
285 | free (fp->_IO_save_base); |
286 | fp->_IO_save_base = new_buffer; |
287 | fp->_IO_save_end = new_buffer + avail + needed_size; |
288 | } |
289 | else |
290 | { |
291 | avail = current_Bsize - needed_size; |
292 | if (least_mark < 0) |
293 | { |
294 | memmove (fp->_IO_save_base + avail, |
295 | fp->_IO_save_end + least_mark, |
296 | -least_mark); |
297 | memcpy (fp->_IO_save_base + avail - least_mark, |
298 | fp->_IO_read_base, |
299 | end_p - fp->_IO_read_base); |
300 | } |
301 | else if (needed_size > 0) |
302 | memcpy (fp->_IO_save_base + avail, |
303 | fp->_IO_read_base + least_mark, |
304 | needed_size); |
305 | } |
306 | fp->_IO_backup_base = fp->_IO_save_base + avail; |
307 | /* Adjust all the streammarkers. */ |
308 | delta = end_p - fp->_IO_read_base; |
309 | for (mark = fp->_markers; mark != NULL; mark = mark->_next) |
310 | mark->_pos -= delta; |
311 | return 0; |
312 | } |
313 | |
314 | int |
315 | __underflow (_IO_FILE *fp) |
316 | { |
317 | #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T |
318 | if (_IO_vtable_offset (fp) == 0 && _IO_fwide (fp, -1) != -1) |
319 | return EOF; |
320 | #endif |
321 | |
322 | if (fp->_mode == 0) |
323 | _IO_fwide (fp, -1); |
324 | if (_IO_in_put_mode (fp)) |
325 | if (_IO_switch_to_get_mode (fp) == EOF) |
326 | return EOF; |
327 | if (fp->_IO_read_ptr < fp->_IO_read_end) |
328 | return *(unsigned char *) fp->_IO_read_ptr; |
329 | if (_IO_in_backup (fp)) |
330 | { |
331 | _IO_switch_to_main_get_area (fp); |
332 | if (fp->_IO_read_ptr < fp->_IO_read_end) |
333 | return *(unsigned char *) fp->_IO_read_ptr; |
334 | } |
335 | if (_IO_have_markers (fp)) |
336 | { |
337 | if (save_for_backup (fp, fp->_IO_read_end)) |
338 | return EOF; |
339 | } |
340 | else if (_IO_have_backup (fp)) |
341 | _IO_free_backup_area (fp); |
342 | return _IO_UNDERFLOW (fp); |
343 | } |
344 | libc_hidden_def (__underflow) |
345 | |
346 | int |
347 | __uflow (_IO_FILE *fp) |
348 | { |
349 | #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T |
350 | if (_IO_vtable_offset (fp) == 0 && _IO_fwide (fp, -1) != -1) |
351 | return EOF; |
352 | #endif |
353 | |
354 | if (fp->_mode == 0) |
355 | _IO_fwide (fp, -1); |
356 | if (_IO_in_put_mode (fp)) |
357 | if (_IO_switch_to_get_mode (fp) == EOF) |
358 | return EOF; |
359 | if (fp->_IO_read_ptr < fp->_IO_read_end) |
360 | return *(unsigned char *) fp->_IO_read_ptr++; |
361 | if (_IO_in_backup (fp)) |
362 | { |
363 | _IO_switch_to_main_get_area (fp); |
364 | if (fp->_IO_read_ptr < fp->_IO_read_end) |
365 | return *(unsigned char *) fp->_IO_read_ptr++; |
366 | } |
367 | if (_IO_have_markers (fp)) |
368 | { |
369 | if (save_for_backup (fp, fp->_IO_read_end)) |
370 | return EOF; |
371 | } |
372 | else if (_IO_have_backup (fp)) |
373 | _IO_free_backup_area (fp); |
374 | return _IO_UFLOW (fp); |
375 | } |
376 | libc_hidden_def (__uflow) |
377 | |
378 | void |
379 | _IO_setb (_IO_FILE *f, char *b, char *eb, int a) |
380 | { |
381 | if (f->_IO_buf_base && !(f->_flags & _IO_USER_BUF)) |
382 | free (f->_IO_buf_base); |
383 | f->_IO_buf_base = b; |
384 | f->_IO_buf_end = eb; |
385 | if (a) |
386 | f->_flags &= ~_IO_USER_BUF; |
387 | else |
388 | f->_flags |= _IO_USER_BUF; |
389 | } |
390 | libc_hidden_def (_IO_setb) |
391 | |
392 | void |
393 | _IO_doallocbuf (_IO_FILE *fp) |
394 | { |
395 | if (fp->_IO_buf_base) |
396 | return; |
397 | if (!(fp->_flags & _IO_UNBUFFERED) || fp->_mode > 0) |
398 | if (_IO_DOALLOCATE (fp) != EOF) |
399 | return; |
400 | _IO_setb (fp, fp->_shortbuf, fp->_shortbuf+1, 0); |
401 | } |
402 | libc_hidden_def (_IO_doallocbuf) |
403 | |
404 | int |
405 | _IO_default_underflow (_IO_FILE *fp) |
406 | { |
407 | return EOF; |
408 | } |
409 | |
410 | int |
411 | _IO_default_uflow (_IO_FILE *fp) |
412 | { |
413 | int ch = _IO_UNDERFLOW (fp); |
414 | if (ch == EOF) |
415 | return EOF; |
416 | return *(unsigned char *) fp->_IO_read_ptr++; |
417 | } |
418 | libc_hidden_def (_IO_default_uflow) |
419 | |
420 | _IO_size_t |
421 | _IO_default_xsputn (_IO_FILE *f, const void *data, _IO_size_t n) |
422 | { |
423 | const char *s = (char *) data; |
424 | _IO_size_t more = n; |
425 | if (more <= 0) |
426 | return 0; |
427 | for (;;) |
428 | { |
429 | /* Space available. */ |
430 | if (f->_IO_write_ptr < f->_IO_write_end) |
431 | { |
432 | _IO_size_t count = f->_IO_write_end - f->_IO_write_ptr; |
433 | if (count > more) |
434 | count = more; |
435 | if (count > 20) |
436 | { |
437 | #ifdef _LIBC |
438 | f->_IO_write_ptr = __mempcpy (f->_IO_write_ptr, s, count); |
439 | #else |
440 | memcpy (f->_IO_write_ptr, s, count); |
441 | f->_IO_write_ptr += count; |
442 | #endif |
443 | s += count; |
444 | } |
445 | else if (count) |
446 | { |
447 | char *p = f->_IO_write_ptr; |
448 | _IO_ssize_t i; |
449 | for (i = count; --i >= 0; ) |
450 | *p++ = *s++; |
451 | f->_IO_write_ptr = p; |
452 | } |
453 | more -= count; |
454 | } |
455 | if (more == 0 || _IO_OVERFLOW (f, (unsigned char) *s++) == EOF) |
456 | break; |
457 | more--; |
458 | } |
459 | return n - more; |
460 | } |
461 | libc_hidden_def (_IO_default_xsputn) |
462 | |
463 | _IO_size_t |
464 | _IO_sgetn (_IO_FILE *fp, void *data, _IO_size_t n) |
465 | { |
466 | /* FIXME handle putback buffer here! */ |
467 | return _IO_XSGETN (fp, data, n); |
468 | } |
469 | libc_hidden_def (_IO_sgetn) |
470 | |
471 | _IO_size_t |
472 | _IO_default_xsgetn (_IO_FILE *fp, void *data, _IO_size_t n) |
473 | { |
474 | _IO_size_t more = n; |
475 | char *s = (char*) data; |
476 | for (;;) |
477 | { |
478 | /* Data available. */ |
479 | if (fp->_IO_read_ptr < fp->_IO_read_end) |
480 | { |
481 | _IO_size_t count = fp->_IO_read_end - fp->_IO_read_ptr; |
482 | if (count > more) |
483 | count = more; |
484 | if (count > 20) |
485 | { |
486 | #ifdef _LIBC |
487 | s = __mempcpy (s, fp->_IO_read_ptr, count); |
488 | #else |
489 | memcpy (s, fp->_IO_read_ptr, count); |
490 | s += count; |
491 | #endif |
492 | fp->_IO_read_ptr += count; |
493 | } |
494 | else if (count) |
495 | { |
496 | char *p = fp->_IO_read_ptr; |
497 | int i = (int) count; |
498 | while (--i >= 0) |
499 | *s++ = *p++; |
500 | fp->_IO_read_ptr = p; |
501 | } |
502 | more -= count; |
503 | } |
504 | if (more == 0 || __underflow (fp) == EOF) |
505 | break; |
506 | } |
507 | return n - more; |
508 | } |
509 | libc_hidden_def (_IO_default_xsgetn) |
510 | |
511 | #if 0 |
512 | /* Seems not to be needed. --drepper */ |
513 | int |
514 | _IO_sync (_IO_FILE *fp) |
515 | { |
516 | return 0; |
517 | } |
518 | #endif |
519 | |
520 | _IO_FILE * |
521 | _IO_default_setbuf (_IO_FILE *fp, char *p, _IO_ssize_t len) |
522 | { |
523 | if (_IO_SYNC (fp) == EOF) |
524 | return NULL; |
525 | if (p == NULL || len == 0) |
526 | { |
527 | fp->_flags |= _IO_UNBUFFERED; |
528 | _IO_setb (fp, fp->_shortbuf, fp->_shortbuf+1, 0); |
529 | } |
530 | else |
531 | { |
532 | fp->_flags &= ~_IO_UNBUFFERED; |
533 | _IO_setb (fp, p, p+len, 0); |
534 | } |
535 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end = 0; |
536 | fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_read_end = 0; |
537 | return fp; |
538 | } |
539 | |
540 | _IO_off64_t |
541 | _IO_default_seekpos (_IO_FILE *fp, _IO_off64_t pos, int mode) |
542 | { |
543 | return _IO_SEEKOFF (fp, pos, 0, mode); |
544 | } |
545 | |
546 | int |
547 | _IO_default_doallocate (_IO_FILE *fp) |
548 | { |
549 | char *buf; |
550 | |
551 | buf = malloc(_IO_BUFSIZ); |
552 | if (__glibc_unlikely (buf == NULL)) |
553 | return EOF; |
554 | |
555 | _IO_setb (fp, buf, buf+_IO_BUFSIZ, 1); |
556 | return 1; |
557 | } |
558 | libc_hidden_def (_IO_default_doallocate) |
559 | |
560 | void |
561 | _IO_init_internal (_IO_FILE *fp, int flags) |
562 | { |
563 | _IO_no_init (fp, flags, -1, NULL, NULL); |
564 | } |
565 | |
566 | void |
567 | _IO_init (_IO_FILE *fp, int flags) |
568 | { |
569 | IO_set_accept_foreign_vtables (&_IO_vtable_check); |
570 | _IO_init_internal (fp, flags); |
571 | } |
572 | |
573 | void |
574 | _IO_old_init (_IO_FILE *fp, int flags) |
575 | { |
576 | fp->_flags = _IO_MAGIC|flags; |
577 | fp->_flags2 = 0; |
578 | fp->_IO_buf_base = NULL; |
579 | fp->_IO_buf_end = NULL; |
580 | fp->_IO_read_base = NULL; |
581 | fp->_IO_read_ptr = NULL; |
582 | fp->_IO_read_end = NULL; |
583 | fp->_IO_write_base = NULL; |
584 | fp->_IO_write_ptr = NULL; |
585 | fp->_IO_write_end = NULL; |
586 | fp->_chain = NULL; /* Not necessary. */ |
587 | |
588 | fp->_IO_save_base = NULL; |
589 | fp->_IO_backup_base = NULL; |
590 | fp->_IO_save_end = NULL; |
591 | fp->_markers = NULL; |
592 | fp->_cur_column = 0; |
593 | #if _IO_JUMPS_OFFSET |
594 | fp->_vtable_offset = 0; |
595 | #endif |
596 | #ifdef _IO_MTSAFE_IO |
597 | if (fp->_lock != NULL) |
598 | _IO_lock_init (*fp->_lock); |
599 | #endif |
600 | } |
601 | |
602 | void |
603 | _IO_no_init (_IO_FILE *fp, int flags, int orientation, |
604 | struct _IO_wide_data *wd, const struct _IO_jump_t *jmp) |
605 | { |
606 | _IO_old_init (fp, flags); |
607 | fp->_mode = orientation; |
608 | #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T |
609 | if (orientation >= 0) |
610 | { |
611 | fp->_wide_data = wd; |
612 | fp->_wide_data->_IO_buf_base = NULL; |
613 | fp->_wide_data->_IO_buf_end = NULL; |
614 | fp->_wide_data->_IO_read_base = NULL; |
615 | fp->_wide_data->_IO_read_ptr = NULL; |
616 | fp->_wide_data->_IO_read_end = NULL; |
617 | fp->_wide_data->_IO_write_base = NULL; |
618 | fp->_wide_data->_IO_write_ptr = NULL; |
619 | fp->_wide_data->_IO_write_end = NULL; |
620 | fp->_wide_data->_IO_save_base = NULL; |
621 | fp->_wide_data->_IO_backup_base = NULL; |
622 | fp->_wide_data->_IO_save_end = NULL; |
623 | |
624 | fp->_wide_data->_wide_vtable = jmp; |
625 | } |
626 | else |
627 | /* Cause predictable crash when a wide function is called on a byte |
628 | stream. */ |
629 | fp->_wide_data = (struct _IO_wide_data *) -1L; |
630 | #endif |
631 | fp->_freeres_list = NULL; |
632 | } |
633 | |
634 | int |
635 | _IO_default_sync (_IO_FILE *fp) |
636 | { |
637 | return 0; |
638 | } |
639 | |
640 | /* The way the C++ classes are mapped into the C functions in the |
641 | current implementation, this function can get called twice! */ |
642 | |
643 | void |
644 | _IO_default_finish (_IO_FILE *fp, int dummy) |
645 | { |
646 | struct _IO_marker *mark; |
647 | if (fp->_IO_buf_base && !(fp->_flags & _IO_USER_BUF)) |
648 | { |
649 | free (fp->_IO_buf_base); |
650 | fp->_IO_buf_base = fp->_IO_buf_end = NULL; |
651 | } |
652 | |
653 | for (mark = fp->_markers; mark != NULL; mark = mark->_next) |
654 | mark->_sbuf = NULL; |
655 | |
656 | if (fp->_IO_save_base) |
657 | { |
658 | free (fp->_IO_save_base); |
659 | fp->_IO_save_base = NULL; |
660 | } |
661 | |
662 | _IO_un_link ((struct _IO_FILE_plus *) fp); |
663 | |
664 | #ifdef _IO_MTSAFE_IO |
665 | if (fp->_lock != NULL) |
666 | _IO_lock_fini (*fp->_lock); |
667 | #endif |
668 | } |
669 | libc_hidden_def (_IO_default_finish) |
670 | |
671 | _IO_off64_t |
672 | _IO_default_seekoff (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode) |
673 | { |
674 | return _IO_pos_BAD; |
675 | } |
676 | |
677 | int |
678 | _IO_sputbackc (_IO_FILE *fp, int c) |
679 | { |
680 | int result; |
681 | |
682 | if (fp->_IO_read_ptr > fp->_IO_read_base |
683 | && (unsigned char)fp->_IO_read_ptr[-1] == (unsigned char)c) |
684 | { |
685 | fp->_IO_read_ptr--; |
686 | result = (unsigned char) c; |
687 | } |
688 | else |
689 | result = _IO_PBACKFAIL (fp, c); |
690 | |
691 | if (result != EOF) |
692 | fp->_flags &= ~_IO_EOF_SEEN; |
693 | |
694 | return result; |
695 | } |
696 | libc_hidden_def (_IO_sputbackc) |
697 | |
698 | int |
699 | _IO_sungetc (_IO_FILE *fp) |
700 | { |
701 | int result; |
702 | |
703 | if (fp->_IO_read_ptr > fp->_IO_read_base) |
704 | { |
705 | fp->_IO_read_ptr--; |
706 | result = (unsigned char) *fp->_IO_read_ptr; |
707 | } |
708 | else |
709 | result = _IO_PBACKFAIL (fp, EOF); |
710 | |
711 | if (result != EOF) |
712 | fp->_flags &= ~_IO_EOF_SEEN; |
713 | |
714 | return result; |
715 | } |
716 | |
717 | #if 0 /* Work in progress */ |
718 | /* Seems not to be needed. */ |
719 | #if 0 |
720 | void |
721 | _IO_set_column (_IO_FILE *fp, int c) |
722 | { |
723 | if (c == -1) |
724 | fp->_column = -1; |
725 | else |
726 | fp->_column = c - (fp->_IO_write_ptr - fp->_IO_write_base); |
727 | } |
728 | #else |
729 | int |
730 | _IO_set_column (_IO_FILE *fp, int i) |
731 | { |
732 | fp->_cur_column = i + 1; |
733 | return 0; |
734 | } |
735 | #endif |
736 | #endif |
737 | |
738 | |
739 | unsigned |
740 | _IO_adjust_column (unsigned start, const char *line, int count) |
741 | { |
742 | const char *ptr = line + count; |
743 | while (ptr > line) |
744 | if (*--ptr == '\n') |
745 | return line + count - ptr - 1; |
746 | return start + count; |
747 | } |
748 | libc_hidden_def (_IO_adjust_column) |
749 | |
750 | #if 0 |
751 | /* Seems not to be needed. --drepper */ |
752 | int |
753 | _IO_get_column (_IO_FILE *fp) |
754 | { |
755 | if (fp->_cur_column) |
756 | return _IO_adjust_column (fp->_cur_column - 1, |
757 | fp->_IO_write_base, |
758 | fp->_IO_write_ptr - fp->_IO_write_base); |
759 | return -1; |
760 | } |
761 | #endif |
762 | |
763 | |
764 | int |
765 | _IO_flush_all_lockp (int do_lock) |
766 | { |
767 | int result = 0; |
768 | struct _IO_FILE *fp; |
769 | int last_stamp; |
770 | |
771 | #ifdef _IO_MTSAFE_IO |
772 | __libc_cleanup_region_start (do_lock, flush_cleanup, NULL); |
773 | if (do_lock) |
774 | _IO_lock_lock (list_all_lock); |
775 | #endif |
776 | |
777 | last_stamp = _IO_list_all_stamp; |
778 | fp = (_IO_FILE *) _IO_list_all; |
779 | while (fp != NULL) |
780 | { |
781 | run_fp = fp; |
782 | if (do_lock) |
783 | _IO_flockfile (fp); |
784 | |
785 | if (((fp->_mode <= 0 && fp->_IO_write_ptr > fp->_IO_write_base) |
786 | #if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T |
787 | || (_IO_vtable_offset (fp) == 0 |
788 | && fp->_mode > 0 && (fp->_wide_data->_IO_write_ptr |
789 | > fp->_wide_data->_IO_write_base)) |
790 | #endif |
791 | ) |
792 | && _IO_OVERFLOW (fp, EOF) == EOF) |
793 | result = EOF; |
794 | |
795 | if (do_lock) |
796 | _IO_funlockfile (fp); |
797 | run_fp = NULL; |
798 | |
799 | if (last_stamp != _IO_list_all_stamp) |
800 | { |
801 | /* Something was added to the list. Start all over again. */ |
802 | fp = (_IO_FILE *) _IO_list_all; |
803 | last_stamp = _IO_list_all_stamp; |
804 | } |
805 | else |
806 | fp = fp->_chain; |
807 | } |
808 | |
809 | #ifdef _IO_MTSAFE_IO |
810 | if (do_lock) |
811 | _IO_lock_unlock (list_all_lock); |
812 | __libc_cleanup_region_end (0); |
813 | #endif |
814 | |
815 | return result; |
816 | } |
817 | |
818 | |
819 | int |
820 | _IO_flush_all (void) |
821 | { |
822 | /* We want locking. */ |
823 | return _IO_flush_all_lockp (1); |
824 | } |
825 | libc_hidden_def (_IO_flush_all) |
826 | |
827 | void |
828 | _IO_flush_all_linebuffered (void) |
829 | { |
830 | struct _IO_FILE *fp; |
831 | int last_stamp; |
832 | |
833 | #ifdef _IO_MTSAFE_IO |
834 | _IO_cleanup_region_start_noarg (flush_cleanup); |
835 | _IO_lock_lock (list_all_lock); |
836 | #endif |
837 | |
838 | last_stamp = _IO_list_all_stamp; |
839 | fp = (_IO_FILE *) _IO_list_all; |
840 | while (fp != NULL) |
841 | { |
842 | run_fp = fp; |
843 | _IO_flockfile (fp); |
844 | |
845 | if ((fp->_flags & _IO_NO_WRITES) == 0 && fp->_flags & _IO_LINE_BUF) |
846 | _IO_OVERFLOW (fp, EOF); |
847 | |
848 | _IO_funlockfile (fp); |
849 | run_fp = NULL; |
850 | |
851 | if (last_stamp != _IO_list_all_stamp) |
852 | { |
853 | /* Something was added to the list. Start all over again. */ |
854 | fp = (_IO_FILE *) _IO_list_all; |
855 | last_stamp = _IO_list_all_stamp; |
856 | } |
857 | else |
858 | fp = fp->_chain; |
859 | } |
860 | |
861 | #ifdef _IO_MTSAFE_IO |
862 | _IO_lock_unlock (list_all_lock); |
863 | _IO_cleanup_region_end (0); |
864 | #endif |
865 | } |
866 | libc_hidden_def (_IO_flush_all_linebuffered) |
867 | #ifdef _LIBC |
868 | weak_alias (_IO_flush_all_linebuffered, _flushlbf) |
869 | #endif |
870 | |
871 | |
872 | /* The following is a bit tricky. In general, we want to unbuffer the |
873 | streams so that all output which follows is seen. If we are not |
874 | looking for memory leaks it does not make much sense to free the |
875 | actual buffer because this will happen anyway once the program |
876 | terminated. If we do want to look for memory leaks we have to free |
877 | the buffers. Whether something is freed is determined by the |
878 | function sin the libc_freeres section. Those are called as part of |
879 | the atexit routine, just like _IO_cleanup. The problem is we do |
880 | not know whether the freeres code is called first or _IO_cleanup. |
881 | if the former is the case, we set the DEALLOC_BUFFER variable to |
882 | true and _IO_unbuffer_all will take care of the rest. If |
883 | _IO_unbuffer_all is called first we add the streams to a list |
884 | which the freeres function later can walk through. */ |
885 | static void _IO_unbuffer_all (void); |
886 | |
887 | static bool dealloc_buffers; |
888 | static _IO_FILE *freeres_list; |
889 | |
890 | static void |
891 | _IO_unbuffer_all (void) |
892 | { |
893 | struct _IO_FILE *fp; |
894 | for (fp = (_IO_FILE *) _IO_list_all; fp; fp = fp->_chain) |
895 | { |
896 | if (! (fp->_flags & _IO_UNBUFFERED) |
897 | /* Iff stream is un-orientated, it wasn't used. */ |
898 | && fp->_mode != 0) |
899 | { |
900 | #ifdef _IO_MTSAFE_IO |
901 | int cnt; |
902 | #define MAXTRIES 2 |
903 | for (cnt = 0; cnt < MAXTRIES; ++cnt) |
904 | if (fp->_lock == NULL || _IO_lock_trylock (*fp->_lock) == 0) |
905 | break; |
906 | else |
907 | /* Give the other thread time to finish up its use of the |
908 | stream. */ |
909 | __sched_yield (); |
910 | #endif |
911 | |
912 | if (! dealloc_buffers && !(fp->_flags & _IO_USER_BUF)) |
913 | { |
914 | fp->_flags |= _IO_USER_BUF; |
915 | |
916 | fp->_freeres_list = freeres_list; |
917 | freeres_list = fp; |
918 | fp->_freeres_buf = fp->_IO_buf_base; |
919 | } |
920 | |
921 | _IO_SETBUF (fp, NULL, 0); |
922 | |
923 | if (fp->_mode > 0) |
924 | _IO_wsetb (fp, NULL, NULL, 0); |
925 | |
926 | #ifdef _IO_MTSAFE_IO |
927 | if (cnt < MAXTRIES && fp->_lock != NULL) |
928 | _IO_lock_unlock (*fp->_lock); |
929 | #endif |
930 | } |
931 | |
932 | /* Make sure that never again the wide char functions can be |
933 | used. */ |
934 | fp->_mode = -1; |
935 | } |
936 | } |
937 | |
938 | |
939 | libc_freeres_fn (buffer_free) |
940 | { |
941 | dealloc_buffers = true; |
942 | |
943 | while (freeres_list != NULL) |
944 | { |
945 | free (freeres_list->_freeres_buf); |
946 | |
947 | freeres_list = freeres_list->_freeres_list; |
948 | } |
949 | } |
950 | |
951 | |
952 | int |
953 | _IO_cleanup (void) |
954 | { |
955 | /* We do *not* want locking. Some threads might use streams but |
956 | that is their problem, we flush them underneath them. */ |
957 | int result = _IO_flush_all_lockp (0); |
958 | |
959 | /* We currently don't have a reliable mechanism for making sure that |
960 | C++ static destructors are executed in the correct order. |
961 | So it is possible that other static destructors might want to |
962 | write to cout - and they're supposed to be able to do so. |
963 | |
964 | The following will make the standard streambufs be unbuffered, |
965 | which forces any output from late destructors to be written out. */ |
966 | _IO_unbuffer_all (); |
967 | |
968 | return result; |
969 | } |
970 | |
971 | |
972 | void |
973 | _IO_init_marker (struct _IO_marker *marker, _IO_FILE *fp) |
974 | { |
975 | marker->_sbuf = fp; |
976 | if (_IO_in_put_mode (fp)) |
977 | _IO_switch_to_get_mode (fp); |
978 | if (_IO_in_backup (fp)) |
979 | marker->_pos = fp->_IO_read_ptr - fp->_IO_read_end; |
980 | else |
981 | marker->_pos = fp->_IO_read_ptr - fp->_IO_read_base; |
982 | |
983 | /* Should perhaps sort the chain? */ |
984 | marker->_next = fp->_markers; |
985 | fp->_markers = marker; |
986 | } |
987 | |
988 | void |
989 | _IO_remove_marker (struct _IO_marker *marker) |
990 | { |
991 | /* Unlink from sb's chain. */ |
992 | struct _IO_marker **ptr = &marker->_sbuf->_markers; |
993 | for (; ; ptr = &(*ptr)->_next) |
994 | { |
995 | if (*ptr == NULL) |
996 | break; |
997 | else if (*ptr == marker) |
998 | { |
999 | *ptr = marker->_next; |
1000 | return; |
1001 | } |
1002 | } |
1003 | #if 0 |
1004 | if _sbuf has a backup area that is no longer needed, should we delete |
1005 | it now, or wait until the next underflow? |
1006 | #endif |
1007 | } |
1008 | |
1009 | #define BAD_DELTA EOF |
1010 | |
1011 | int |
1012 | _IO_marker_difference (struct _IO_marker *mark1, struct _IO_marker *mark2) |
1013 | { |
1014 | return mark1->_pos - mark2->_pos; |
1015 | } |
1016 | |
1017 | /* Return difference between MARK and current position of MARK's stream. */ |
1018 | int |
1019 | _IO_marker_delta (struct _IO_marker *mark) |
1020 | { |
1021 | int cur_pos; |
1022 | if (mark->_sbuf == NULL) |
1023 | return BAD_DELTA; |
1024 | if (_IO_in_backup (mark->_sbuf)) |
1025 | cur_pos = mark->_sbuf->_IO_read_ptr - mark->_sbuf->_IO_read_end; |
1026 | else |
1027 | cur_pos = mark->_sbuf->_IO_read_ptr - mark->_sbuf->_IO_read_base; |
1028 | return mark->_pos - cur_pos; |
1029 | } |
1030 | |
1031 | int |
1032 | _IO_seekmark (_IO_FILE *fp, struct _IO_marker *mark, int delta) |
1033 | { |
1034 | if (mark->_sbuf != fp) |
1035 | return EOF; |
1036 | if (mark->_pos >= 0) |
1037 | { |
1038 | if (_IO_in_backup (fp)) |
1039 | _IO_switch_to_main_get_area (fp); |
1040 | fp->_IO_read_ptr = fp->_IO_read_base + mark->_pos; |
1041 | } |
1042 | else |
1043 | { |
1044 | if (!_IO_in_backup (fp)) |
1045 | _IO_switch_to_backup_area (fp); |
1046 | fp->_IO_read_ptr = fp->_IO_read_end + mark->_pos; |
1047 | } |
1048 | return 0; |
1049 | } |
1050 | |
1051 | void |
1052 | _IO_unsave_markers (_IO_FILE *fp) |
1053 | { |
1054 | struct _IO_marker *mark = fp->_markers; |
1055 | if (mark) |
1056 | { |
1057 | #ifdef TODO |
1058 | streampos offset = seekoff (0, ios::cur, ios::in); |
1059 | if (offset != EOF) |
1060 | { |
1061 | offset += eGptr () - Gbase (); |
1062 | for ( ; mark != NULL; mark = mark->_next) |
1063 | mark->set_streampos (mark->_pos + offset); |
1064 | } |
1065 | else |
1066 | { |
1067 | for ( ; mark != NULL; mark = mark->_next) |
1068 | mark->set_streampos (EOF); |
1069 | } |
1070 | #endif |
1071 | fp->_markers = 0; |
1072 | } |
1073 | |
1074 | if (_IO_have_backup (fp)) |
1075 | _IO_free_backup_area (fp); |
1076 | } |
1077 | libc_hidden_def (_IO_unsave_markers) |
1078 | |
1079 | #if 0 |
1080 | /* Seems not to be needed. --drepper */ |
1081 | int |
1082 | _IO_nobackup_pbackfail (_IO_FILE *fp, int c) |
1083 | { |
1084 | if (fp->_IO_read_ptr > fp->_IO_read_base) |
1085 | fp->_IO_read_ptr--; |
1086 | if (c != EOF && *fp->_IO_read_ptr != c) |
1087 | *fp->_IO_read_ptr = c; |
1088 | return (unsigned char) c; |
1089 | } |
1090 | #endif |
1091 | |
1092 | int |
1093 | _IO_default_pbackfail (_IO_FILE *fp, int c) |
1094 | { |
1095 | if (fp->_IO_read_ptr > fp->_IO_read_base && !_IO_in_backup (fp) |
1096 | && (unsigned char) fp->_IO_read_ptr[-1] == c) |
1097 | --fp->_IO_read_ptr; |
1098 | else |
1099 | { |
1100 | /* Need to handle a filebuf in write mode (switch to read mode). FIXME!*/ |
1101 | if (!_IO_in_backup (fp)) |
1102 | { |
1103 | /* We need to keep the invariant that the main get area |
1104 | logically follows the backup area. */ |
1105 | if (fp->_IO_read_ptr > fp->_IO_read_base && _IO_have_backup (fp)) |
1106 | { |
1107 | if (save_for_backup (fp, fp->_IO_read_ptr)) |
1108 | return EOF; |
1109 | } |
1110 | else if (!_IO_have_backup (fp)) |
1111 | { |
1112 | /* No backup buffer: allocate one. */ |
1113 | /* Use nshort buffer, if unused? (probably not) FIXME */ |
1114 | int backup_size = 128; |
1115 | char *bbuf = (char *) malloc (backup_size); |
1116 | if (bbuf == NULL) |
1117 | return EOF; |
1118 | fp->_IO_save_base = bbuf; |
1119 | fp->_IO_save_end = fp->_IO_save_base + backup_size; |
1120 | fp->_IO_backup_base = fp->_IO_save_end; |
1121 | } |
1122 | fp->_IO_read_base = fp->_IO_read_ptr; |
1123 | _IO_switch_to_backup_area (fp); |
1124 | } |
1125 | else if (fp->_IO_read_ptr <= fp->_IO_read_base) |
1126 | { |
1127 | /* Increase size of existing backup buffer. */ |
1128 | _IO_size_t new_size; |
1129 | _IO_size_t old_size = fp->_IO_read_end - fp->_IO_read_base; |
1130 | char *new_buf; |
1131 | new_size = 2 * old_size; |
1132 | new_buf = (char *) malloc (new_size); |
1133 | if (new_buf == NULL) |
1134 | return EOF; |
1135 | memcpy (new_buf + (new_size - old_size), fp->_IO_read_base, |
1136 | old_size); |
1137 | free (fp->_IO_read_base); |
1138 | _IO_setg (fp, new_buf, new_buf + (new_size - old_size), |
1139 | new_buf + new_size); |
1140 | fp->_IO_backup_base = fp->_IO_read_ptr; |
1141 | } |
1142 | |
1143 | *--fp->_IO_read_ptr = c; |
1144 | } |
1145 | return (unsigned char) c; |
1146 | } |
1147 | libc_hidden_def (_IO_default_pbackfail) |
1148 | |
1149 | _IO_off64_t |
1150 | _IO_default_seek (_IO_FILE *fp, _IO_off64_t offset, int dir) |
1151 | { |
1152 | return _IO_pos_BAD; |
1153 | } |
1154 | |
1155 | int |
1156 | _IO_default_stat (_IO_FILE *fp, void *st) |
1157 | { |
1158 | return EOF; |
1159 | } |
1160 | |
1161 | _IO_ssize_t |
1162 | _IO_default_read (_IO_FILE *fp, void *data, _IO_ssize_t n) |
1163 | { |
1164 | return -1; |
1165 | } |
1166 | |
1167 | _IO_ssize_t |
1168 | _IO_default_write (_IO_FILE *fp, const void *data, _IO_ssize_t n) |
1169 | { |
1170 | return 0; |
1171 | } |
1172 | |
1173 | int |
1174 | _IO_default_showmanyc (_IO_FILE *fp) |
1175 | { |
1176 | return -1; |
1177 | } |
1178 | |
1179 | void |
1180 | _IO_default_imbue (_IO_FILE *fp, void *locale) |
1181 | { |
1182 | } |
1183 | |
1184 | _IO_ITER |
1185 | _IO_iter_begin (void) |
1186 | { |
1187 | return (_IO_ITER) _IO_list_all; |
1188 | } |
1189 | libc_hidden_def (_IO_iter_begin) |
1190 | |
1191 | _IO_ITER |
1192 | _IO_iter_end (void) |
1193 | { |
1194 | return NULL; |
1195 | } |
1196 | libc_hidden_def (_IO_iter_end) |
1197 | |
1198 | _IO_ITER |
1199 | _IO_iter_next (_IO_ITER iter) |
1200 | { |
1201 | return iter->_chain; |
1202 | } |
1203 | libc_hidden_def (_IO_iter_next) |
1204 | |
1205 | _IO_FILE * |
1206 | _IO_iter_file (_IO_ITER iter) |
1207 | { |
1208 | return iter; |
1209 | } |
1210 | libc_hidden_def (_IO_iter_file) |
1211 | |
1212 | void |
1213 | _IO_list_lock (void) |
1214 | { |
1215 | #ifdef _IO_MTSAFE_IO |
1216 | _IO_lock_lock (list_all_lock); |
1217 | #endif |
1218 | } |
1219 | libc_hidden_def (_IO_list_lock) |
1220 | |
1221 | void |
1222 | _IO_list_unlock (void) |
1223 | { |
1224 | #ifdef _IO_MTSAFE_IO |
1225 | _IO_lock_unlock (list_all_lock); |
1226 | #endif |
1227 | } |
1228 | libc_hidden_def (_IO_list_unlock) |
1229 | |
1230 | void |
1231 | _IO_list_resetlock (void) |
1232 | { |
1233 | #ifdef _IO_MTSAFE_IO |
1234 | _IO_lock_init (list_all_lock); |
1235 | #endif |
1236 | } |
1237 | libc_hidden_def (_IO_list_resetlock) |
1238 | |
1239 | |
1240 | #ifdef TODO |
1241 | #if defined(linux) |
1242 | #define IO_CLEANUP ; |
1243 | #endif |
1244 | |
1245 | #ifdef IO_CLEANUP |
1246 | IO_CLEANUP |
1247 | #else |
1248 | struct __io_defs { |
1249 | __io_defs() { } |
1250 | ~__io_defs() { _IO_cleanup (); } |
1251 | }; |
1252 | __io_defs io_defs__; |
1253 | #endif |
1254 | |
1255 | #endif /* TODO */ |
1256 | |
1257 | #ifdef text_set_element |
1258 | text_set_element(__libc_atexit, _IO_cleanup); |
1259 | #endif |
1260 | |