]>
Commit | Line | Data |
---|---|---|
1ea89a40 UD |
1 | /* Copyright (C) 1993, 1995, 1997 Free Software Foundation, Inc. |
2 | This file is part of the GNU IO Library. | |
3 | Written by Per Bothner <bothner@cygnus.com>. | |
4 | ||
5 | This library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU General Public License as | |
7 | published by the Free Software Foundation; either version 2, or (at | |
8 | your option) any later version. | |
9 | ||
10 | This library is distributed in the hope that it will be useful, but | |
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this library; see the file COPYING. If not, write to | |
17 | the Free Software Foundation, 59 Temple Place - Suite 330, Boston, | |
18 | MA 02111-1307, USA. | |
19 | ||
20 | As a special exception, if you link this library with files | |
21 | compiled with a GNU compiler to produce an executable, this does | |
22 | not cause the resulting executable to be covered by the GNU General | |
23 | Public License. This exception does not however invalidate any | |
24 | other reasons why the executable file might be covered by the GNU | |
25 | General Public License. */ | |
26 | ||
27 | /* This is a compatibility file. If we don't build the libc with | |
28 | versioning don't compile this file. */ | |
29 | #if DO_VERSIONING | |
30 | ||
31 | ||
32 | #ifndef _POSIX_SOURCE | |
33 | # define _POSIX_SOURCE | |
34 | #endif | |
35 | #include "libioP.h" | |
36 | #include <fcntl.h> | |
37 | #include <sys/types.h> | |
38 | #include <sys/stat.h> | |
39 | #include <string.h> | |
40 | #include <errno.h> | |
41 | #ifndef errno | |
42 | extern int errno; | |
43 | #endif | |
44 | #ifndef __set_errno | |
45 | # define __set_errno(Val) errno = (Val) | |
46 | #endif | |
47 | ||
48 | ||
49 | #ifdef _LIBC | |
50 | # define open(Name, Flags, Prot) __open (Name, Flags, Prot) | |
51 | # define close(FD) __close (FD) | |
52 | # define fstat(FD, Statbuf) __fstat (FD, Statbuf) | |
53 | # define lseek(FD, Offset, Whence) __lseek (FD, Offset, Whence) | |
54 | # define read(FD, Buf, NBytes) __read (FD, Buf, NBytes) | |
55 | # define write(FD, Buf, NBytes) __write (FD, Buf, NBytes) | |
56 | #endif | |
57 | ||
58 | /* An fstream can be in at most one of put mode, get mode, or putback mode. | |
59 | Putback mode is a variant of get mode. | |
60 | ||
61 | In a filebuf, there is only one current position, instead of two | |
62 | separate get and put pointers. In get mode, the current position | |
63 | is that of gptr(); in put mode that of pptr(). | |
64 | ||
65 | The position in the buffer that corresponds to the position | |
66 | in external file system is normally _IO_read_end, except in putback | |
67 | mode, when it is _IO_save_end. | |
68 | If the field _fb._offset is >= 0, it gives the offset in | |
69 | the file as a whole corresponding to eGptr(). (?) | |
70 | ||
71 | PUT MODE: | |
72 | If a filebuf is in put mode, then all of _IO_read_ptr, _IO_read_end, | |
73 | and _IO_read_base are equal to each other. These are usually equal | |
74 | to _IO_buf_base, though not necessarily if we have switched from | |
75 | get mode to put mode. (The reason is to maintain the invariant | |
76 | that _IO_read_end corresponds to the external file position.) | |
77 | _IO_write_base is non-NULL and usually equal to _IO_base_base. | |
78 | We also have _IO_write_end == _IO_buf_end, but only in fully buffered mode. | |
79 | The un-flushed character are those between _IO_write_base and _IO_write_ptr. | |
80 | ||
81 | GET MODE: | |
82 | If a filebuf is in get or putback mode, eback() != egptr(). | |
83 | In get mode, the unread characters are between gptr() and egptr(). | |
84 | The OS file position corresponds to that of egptr(). | |
85 | ||
86 | PUTBACK MODE: | |
87 | Putback mode is used to remember "excess" characters that have | |
88 | been sputbackc'd in a separate putback buffer. | |
89 | In putback mode, the get buffer points to the special putback buffer. | |
90 | The unread characters are the characters between gptr() and egptr() | |
91 | in the putback buffer, as well as the area between save_gptr() | |
92 | and save_egptr(), which point into the original reserve buffer. | |
93 | (The pointers save_gptr() and save_egptr() are the values | |
94 | of gptr() and egptr() at the time putback mode was entered.) | |
95 | The OS position corresponds to that of save_egptr(). | |
96 | ||
97 | LINE BUFFERED OUTPUT: | |
98 | During line buffered output, _IO_write_base==base() && epptr()==base(). | |
99 | However, ptr() may be anywhere between base() and ebuf(). | |
100 | This forces a call to filebuf::overflow(int C) on every put. | |
101 | If there is more space in the buffer, and C is not a '\n', | |
102 | then C is inserted, and pptr() incremented. | |
103 | ||
104 | UNBUFFERED STREAMS: | |
105 | If a filebuf is unbuffered(), the _shortbuf[1] is used as the buffer. | |
106 | */ | |
107 | ||
108 | #define CLOSED_FILEBUF_FLAGS \ | |
109 | (_IO_IS_FILEBUF+_IO_NO_READS+_IO_NO_WRITES+_IO_TIED_PUT_GET) | |
110 | ||
111 | ||
112 | void | |
113 | _IO_old_file_init (fp) | |
114 | _IO_FILE *fp; | |
115 | { | |
116 | /* POSIX.1 allows another file handle to be used to change the position | |
117 | of our file descriptor. Hence we actually don't know the actual | |
118 | position before we do the first fseek (and until a following fflush). */ | |
119 | fp->_old_offset = _IO_pos_BAD; | |
120 | fp->_IO_file_flags |= CLOSED_FILEBUF_FLAGS; | |
121 | ||
122 | _IO_link_in(fp); | |
123 | fp->_fileno = -1; | |
124 | } | |
125 | ||
126 | int | |
127 | _IO_old_file_close_it (fp) | |
128 | _IO_FILE *fp; | |
129 | { | |
130 | int write_status, close_status; | |
131 | if (!_IO_file_is_open (fp)) | |
132 | return EOF; | |
133 | ||
134 | write_status = _IO_do_flush (fp); | |
135 | ||
136 | _IO_unsave_markers(fp); | |
137 | ||
138 | close_status = _IO_SYSCLOSE (fp); | |
139 | ||
140 | /* Free buffer. */ | |
141 | _IO_setb (fp, NULL, NULL, 0); | |
142 | _IO_setg (fp, NULL, NULL, NULL); | |
143 | _IO_setp (fp, NULL, NULL); | |
144 | ||
145 | _IO_un_link (fp); | |
146 | fp->_flags = _IO_MAGIC|CLOSED_FILEBUF_FLAGS; | |
147 | fp->_fileno = EOF; | |
148 | fp->_old_offset = _IO_pos_BAD; | |
149 | ||
150 | return close_status ? close_status : write_status; | |
151 | } | |
152 | ||
153 | void | |
154 | _IO_old_file_finish (fp, dummy) | |
155 | _IO_FILE *fp; | |
156 | int dummy; | |
157 | { | |
158 | if (_IO_file_is_open (fp)) | |
159 | { | |
160 | _IO_do_flush (fp); | |
161 | if (!(fp->_flags & _IO_DELETE_DONT_CLOSE)) | |
162 | _IO_SYSCLOSE (fp); | |
163 | } | |
164 | _IO_default_finish (fp, 0); | |
165 | } | |
166 | ||
167 | _IO_FILE * | |
168 | _IO_old_file_fopen (fp, filename, mode) | |
169 | _IO_FILE *fp; | |
170 | const char *filename; | |
171 | const char *mode; | |
172 | { | |
173 | int oflags = 0, omode; | |
174 | int read_write, fdesc; | |
175 | int oprot = 0666; | |
176 | if (_IO_file_is_open (fp)) | |
177 | return 0; | |
178 | switch (*mode++) | |
179 | { | |
180 | case 'r': | |
181 | omode = O_RDONLY; | |
182 | read_write = _IO_NO_WRITES; | |
183 | break; | |
184 | case 'w': | |
185 | omode = O_WRONLY; | |
186 | oflags = O_CREAT|O_TRUNC; | |
187 | read_write = _IO_NO_READS; | |
188 | break; | |
189 | case 'a': | |
190 | omode = O_WRONLY; | |
191 | oflags = O_CREAT|O_APPEND; | |
192 | read_write = _IO_NO_READS|_IO_IS_APPENDING; | |
193 | break; | |
194 | default: | |
195 | __set_errno (EINVAL); | |
196 | return NULL; | |
197 | } | |
198 | if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+')) | |
199 | { | |
200 | omode = O_RDWR; | |
201 | read_write &= _IO_IS_APPENDING; | |
202 | } | |
203 | fdesc = open (filename, omode|oflags, oprot); | |
204 | if (fdesc < 0) | |
205 | return NULL; | |
206 | fp->_fileno = fdesc; | |
207 | _IO_mask_flags (fp, read_write,_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); | |
208 | if (read_write & _IO_IS_APPENDING) | |
209 | if (_IO_SEEKOFF (fp, (_IO_off_t)0, _IO_seek_end, _IOS_INPUT|_IOS_OUTPUT) | |
210 | == _IO_pos_BAD && errno != ESPIPE) | |
211 | return NULL; | |
212 | _IO_link_in (fp); | |
213 | return fp; | |
214 | } | |
215 | ||
216 | _IO_FILE * | |
217 | _IO_old_file_attach (fp, fd) | |
218 | _IO_FILE *fp; | |
219 | int fd; | |
220 | { | |
221 | if (_IO_file_is_open (fp)) | |
222 | return NULL; | |
223 | fp->_fileno = fd; | |
224 | fp->_flags &= ~(_IO_NO_READS+_IO_NO_WRITES); | |
225 | fp->_flags |= _IO_DELETE_DONT_CLOSE; | |
226 | /* Get the current position of the file. */ | |
227 | /* We have to do that since that may be junk. */ | |
228 | fp->_old_offset = _IO_pos_BAD; | |
229 | if (_IO_SEEKOFF (fp, (_IO_off_t)0, _IO_seek_cur, _IOS_INPUT|_IOS_OUTPUT) | |
230 | == _IO_pos_BAD && errno != ESPIPE) | |
231 | return NULL; | |
232 | return fp; | |
233 | } | |
234 | ||
235 | _IO_FILE * | |
236 | _IO_old_file_setbuf (fp, p, len) | |
237 | _IO_FILE *fp; | |
238 | char *p; | |
239 | _IO_ssize_t len; | |
240 | { | |
241 | if (_IO_default_setbuf (fp, p, len) == NULL) | |
242 | return NULL; | |
243 | ||
244 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end | |
245 | = fp->_IO_buf_base; | |
246 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); | |
247 | ||
248 | return fp; | |
249 | } | |
250 | ||
251 | /* Write TO_DO bytes from DATA to FP. | |
252 | Then mark FP as having empty buffers. */ | |
253 | ||
254 | int | |
255 | _IO_old_do_write (fp, data, to_do) | |
256 | _IO_FILE *fp; | |
257 | const char *data; | |
258 | _IO_size_t to_do; | |
259 | { | |
260 | _IO_size_t count; | |
261 | if (to_do == 0) | |
262 | return 0; | |
263 | if (fp->_flags & _IO_IS_APPENDING) | |
264 | /* On a system without a proper O_APPEND implementation, | |
265 | you would need to sys_seek(0, SEEK_END) here, but is | |
266 | is not needed nor desirable for Unix- or Posix-like systems. | |
267 | Instead, just indicate that offset (before and after) is | |
268 | unpredictable. */ | |
269 | fp->_old_offset = _IO_pos_BAD; | |
270 | else if (fp->_IO_read_end != fp->_IO_write_base) | |
271 | { | |
272 | _IO_pos_t new_pos | |
273 | = _IO_SYSSEEK (fp, fp->_IO_write_base - fp->_IO_read_end, 1); | |
274 | if (new_pos == _IO_pos_BAD) | |
275 | return EOF; | |
276 | fp->_old_offset = new_pos; | |
277 | } | |
278 | count = _IO_SYSWRITE (fp, data, to_do); | |
279 | if (fp->_cur_column) | |
280 | fp->_cur_column = _IO_adjust_column (fp->_cur_column - 1, data, to_do) + 1; | |
281 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); | |
282 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_buf_base; | |
283 | fp->_IO_write_end = ((fp->_flags & (_IO_LINE_BUF+_IO_UNBUFFERED)) | |
284 | ? fp->_IO_buf_base : fp->_IO_buf_end); | |
285 | return count != to_do ? EOF : 0; | |
286 | } | |
287 | ||
288 | int | |
289 | _IO_old_file_underflow (fp) | |
290 | _IO_FILE *fp; | |
291 | { | |
292 | _IO_ssize_t count; | |
293 | #if 0 | |
294 | /* SysV does not make this test; take it out for compatibility */ | |
295 | if (fp->_flags & _IO_EOF_SEEN) | |
296 | return (EOF); | |
297 | #endif | |
298 | ||
299 | if (fp->_flags & _IO_NO_READS) | |
300 | { | |
301 | __set_errno (EBADF); | |
302 | return EOF; | |
303 | } | |
304 | if (fp->_IO_read_ptr < fp->_IO_read_end) | |
305 | return *(unsigned char *) fp->_IO_read_ptr; | |
306 | ||
307 | if (fp->_IO_buf_base == NULL) | |
308 | _IO_doallocbuf (fp); | |
309 | ||
310 | /* Flush all line buffered files before reading. */ | |
311 | /* FIXME This can/should be moved to genops ?? */ | |
312 | if (fp->_flags & (_IO_LINE_BUF|_IO_UNBUFFERED)) | |
313 | _IO_flush_all_linebuffered (); | |
314 | ||
315 | _IO_switch_to_get_mode (fp); | |
316 | ||
317 | /* This is very tricky. We have to adjust those | |
318 | pointers before we call _IO_SYSREAD () since | |
319 | we may longjump () out while waiting for | |
320 | input. Those pointers may be screwed up. H.J. */ | |
321 | fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_buf_base; | |
322 | fp->_IO_read_end = fp->_IO_buf_base; | |
323 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end | |
324 | = fp->_IO_buf_base; | |
325 | ||
326 | count = _IO_SYSREAD (fp, fp->_IO_buf_base, | |
327 | fp->_IO_buf_end - fp->_IO_buf_base); | |
328 | if (count <= 0) | |
329 | { | |
330 | if (count == 0) | |
331 | fp->_flags |= _IO_EOF_SEEN; | |
332 | else | |
333 | fp->_flags |= _IO_ERR_SEEN, count = 0; | |
334 | } | |
335 | fp->_IO_read_end += count; | |
336 | if (count == 0) | |
337 | return EOF; | |
338 | if (fp->_old_offset != _IO_pos_BAD) | |
339 | _IO_pos_adjust (fp->_old_offset, count); | |
340 | return *(unsigned char *) fp->_IO_read_ptr; | |
341 | } | |
342 | ||
343 | int | |
344 | _IO_old_file_overflow (f, ch) | |
345 | _IO_FILE *f; | |
346 | int ch; | |
347 | { | |
348 | if (f->_flags & _IO_NO_WRITES) /* SET ERROR */ | |
349 | { | |
350 | f->_flags |= _IO_ERR_SEEN; | |
351 | __set_errno (EBADF); | |
352 | return EOF; | |
353 | } | |
354 | /* If currently reading or no buffer allocated. */ | |
355 | if ((f->_flags & _IO_CURRENTLY_PUTTING) == 0) | |
356 | { | |
357 | /* Allocate a buffer if needed. */ | |
358 | if (f->_IO_write_base == 0) | |
359 | { | |
360 | _IO_doallocbuf (f); | |
361 | _IO_setg (f, f->_IO_buf_base, f->_IO_buf_base, f->_IO_buf_base); | |
362 | } | |
363 | /* Otherwise must be currently reading. | |
364 | If _IO_read_ptr (and hence also _IO_read_end) is at the buffer end, | |
365 | logically slide the buffer forwards one block (by setting the | |
366 | read pointers to all point at the beginning of the block). This | |
367 | makes room for subsequent output. | |
368 | Otherwise, set the read pointers to _IO_read_end (leaving that | |
369 | alone, so it can continue to correspond to the external position). */ | |
370 | if (f->_IO_read_ptr == f->_IO_buf_end) | |
371 | f->_IO_read_end = f->_IO_read_ptr = f->_IO_buf_base; | |
372 | f->_IO_write_ptr = f->_IO_read_ptr; | |
373 | f->_IO_write_base = f->_IO_write_ptr; | |
374 | f->_IO_write_end = f->_IO_buf_end; | |
375 | f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end; | |
376 | ||
377 | if (f->_flags & (_IO_LINE_BUF+_IO_UNBUFFERED)) | |
378 | f->_IO_write_end = f->_IO_write_ptr; | |
379 | f->_flags |= _IO_CURRENTLY_PUTTING; | |
380 | } | |
381 | if (ch == EOF) | |
382 | return _IO_do_flush (f); | |
383 | if (f->_IO_write_ptr == f->_IO_buf_end ) /* Buffer is really full */ | |
384 | if (_IO_do_flush (f) == EOF) | |
385 | return EOF; | |
386 | *f->_IO_write_ptr++ = ch; | |
387 | if ((f->_flags & _IO_UNBUFFERED) | |
388 | || ((f->_flags & _IO_LINE_BUF) && ch == '\n')) | |
389 | if (_IO_do_flush (f) == EOF) | |
390 | return EOF; | |
391 | return (unsigned char) ch; | |
392 | } | |
393 | ||
394 | int | |
395 | _IO_old_file_sync (fp) | |
396 | _IO_FILE *fp; | |
397 | { | |
398 | _IO_size_t delta; | |
399 | int retval = 0; | |
400 | ||
401 | _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp); | |
402 | _IO_flockfile (fp); | |
403 | /* char* ptr = cur_ptr(); */ | |
404 | if (fp->_IO_write_ptr > fp->_IO_write_base) | |
405 | if (_IO_do_flush(fp)) return EOF; | |
406 | delta = fp->_IO_read_ptr - fp->_IO_read_end; | |
407 | if (delta != 0) | |
408 | { | |
409 | #ifdef TODO | |
410 | if (_IO_in_backup (fp)) | |
411 | delta -= eGptr () - Gbase (); | |
412 | #endif | |
413 | _IO_off_t new_pos = _IO_SYSSEEK (fp, delta, 1); | |
414 | if (new_pos != (_IO_off_t) EOF) | |
415 | fp->_IO_read_end = fp->_IO_read_ptr; | |
416 | #ifdef ESPIPE | |
417 | else if (errno == ESPIPE) | |
418 | ; /* Ignore error from unseekable devices. */ | |
419 | #endif | |
420 | else | |
421 | retval = EOF; | |
422 | } | |
423 | if (retval != EOF) | |
424 | fp->_old_offset = _IO_pos_BAD; | |
425 | /* FIXME: Cleanup - can this be shared? */ | |
426 | /* setg(base(), ptr, ptr); */ | |
427 | _IO_cleanup_region_end (1); | |
428 | return retval; | |
429 | } | |
430 | ||
431 | _IO_fpos64_t | |
432 | _IO_old_file_seekoff (fp, offset, dir, mode) | |
433 | _IO_FILE *fp; | |
434 | _IO_off64_t offset; | |
435 | int dir; | |
436 | int mode; | |
437 | { | |
438 | _IO_pos_t result; | |
439 | _IO_off64_t delta, new_offset; | |
440 | long count; | |
441 | /* POSIX.1 8.2.3.7 says that after a call the fflush() the file | |
442 | offset of the underlying file must be exact. */ | |
443 | int must_be_exact = (fp->_IO_read_base == fp->_IO_read_end | |
444 | && fp->_IO_write_base == fp->_IO_write_ptr); | |
445 | ||
446 | if (mode == 0) | |
447 | dir = _IO_seek_cur, offset = 0; /* Don't move any pointers. */ | |
448 | ||
449 | /* Flush unwritten characters. | |
450 | (This may do an unneeded write if we seek within the buffer. | |
451 | But to be able to switch to reading, we would need to set | |
452 | egptr to ptr. That can't be done in the current design, | |
453 | which assumes file_ptr() is eGptr. Anyway, since we probably | |
454 | end up flushing when we close(), it doesn't make much difference.) | |
455 | FIXME: simulate mem-papped files. */ | |
456 | ||
457 | if (fp->_IO_write_ptr > fp->_IO_write_base || _IO_in_put_mode (fp)) | |
458 | if (_IO_switch_to_get_mode (fp)) | |
459 | return EOF; | |
460 | ||
461 | if (fp->_IO_buf_base == NULL) | |
462 | { | |
463 | _IO_doallocbuf (fp); | |
464 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); | |
465 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); | |
466 | } | |
467 | ||
468 | switch (dir) | |
469 | { | |
470 | case _IO_seek_cur: | |
471 | /* Adjust for read-ahead (bytes is buffer). */ | |
472 | offset -= fp->_IO_read_end - fp->_IO_read_ptr; | |
473 | if (fp->_old_offset == _IO_pos_BAD) | |
474 | goto dumb; | |
475 | /* Make offset absolute, assuming current pointer is file_ptr(). */ | |
476 | offset += _IO_pos_as_off (fp->_old_offset); | |
477 | ||
478 | dir = _IO_seek_set; | |
479 | break; | |
480 | case _IO_seek_set: | |
481 | break; | |
482 | case _IO_seek_end: | |
483 | { | |
484 | struct stat st; | |
485 | if (_IO_SYSSTAT (fp, &st) == 0 && S_ISREG (st.st_mode)) | |
486 | { | |
487 | offset += st.st_size; | |
488 | dir = _IO_seek_set; | |
489 | } | |
490 | else | |
491 | goto dumb; | |
492 | } | |
493 | } | |
494 | /* At this point, dir==_IO_seek_set. */ | |
495 | ||
496 | /* If destination is within current buffer, optimize: */ | |
497 | if (fp->_old_offset != _IO_pos_BAD && fp->_IO_read_base != NULL | |
498 | && !_IO_in_backup (fp)) | |
499 | { | |
500 | /* Offset relative to start of main get area. */ | |
501 | _IO_pos_t rel_offset = (offset - fp->_old_offset | |
502 | + (fp->_IO_read_end - fp->_IO_read_base)); | |
503 | if (rel_offset >= 0) | |
504 | { | |
505 | #if 0 | |
506 | if (_IO_in_backup (fp)) | |
507 | _IO_switch_to_main_get_area (fp); | |
508 | #endif | |
509 | if (rel_offset <= fp->_IO_read_end - fp->_IO_read_base) | |
510 | { | |
511 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + rel_offset, | |
512 | fp->_IO_read_end); | |
513 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); | |
514 | return offset; | |
515 | } | |
516 | #ifdef TODO | |
517 | /* If we have streammarkers, seek forward by reading ahead. */ | |
518 | if (_IO_have_markers (fp)) | |
519 | { | |
520 | int to_skip = rel_offset | |
521 | - (fp->_IO_read_ptr - fp->_IO_read_base); | |
522 | if (ignore (to_skip) != to_skip) | |
523 | goto dumb; | |
524 | return offset; | |
525 | } | |
526 | #endif | |
527 | } | |
528 | #ifdef TODO | |
529 | if (rel_offset < 0 && rel_offset >= Bbase () - Bptr ()) | |
530 | { | |
531 | if (!_IO_in_backup (fp)) | |
532 | _IO_switch_to_backup_area (fp); | |
533 | gbump (fp->_IO_read_end + rel_offset - fp->_IO_read_ptr); | |
534 | return offset; | |
535 | } | |
536 | #endif | |
537 | } | |
538 | ||
539 | #ifdef TODO | |
540 | _IO_unsave_markers (fp); | |
541 | #endif | |
542 | ||
543 | if (fp->_flags & _IO_NO_READS) | |
544 | goto dumb; | |
545 | ||
546 | /* Try to seek to a block boundary, to improve kernel page management. */ | |
547 | new_offset = offset & ~(fp->_IO_buf_end - fp->_IO_buf_base - 1); | |
548 | delta = offset - new_offset; | |
549 | if (delta > fp->_IO_buf_end - fp->_IO_buf_base) | |
550 | { | |
551 | new_offset = offset; | |
552 | delta = 0; | |
553 | } | |
554 | result = _IO_SYSSEEK (fp, new_offset, 0); | |
555 | if (result < 0) | |
556 | return EOF; | |
557 | if (delta == 0) | |
558 | count = 0; | |
559 | else | |
560 | { | |
561 | count = _IO_SYSREAD (fp, fp->_IO_buf_base, | |
562 | (must_be_exact | |
563 | ? delta : fp->_IO_buf_end - fp->_IO_buf_base)); | |
564 | if (count < delta) | |
565 | { | |
566 | /* We weren't allowed to read, but try to seek the remainder. */ | |
567 | offset = count == EOF ? delta : delta-count; | |
568 | dir = _IO_seek_cur; | |
569 | goto dumb; | |
570 | } | |
571 | } | |
572 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + delta, | |
573 | fp->_IO_buf_base + count); | |
574 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); | |
575 | fp->_old_offset = result + count; | |
576 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); | |
577 | return offset; | |
578 | dumb: | |
579 | ||
580 | _IO_unsave_markers (fp); | |
581 | result = _IO_SYSSEEK (fp, offset, dir); | |
582 | if (result != EOF) | |
583 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); | |
584 | fp->_old_offset = result; | |
585 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); | |
586 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); | |
587 | return result; | |
588 | } | |
589 | ||
590 | _IO_ssize_t | |
591 | _IO_old_file_write (f, data, n) | |
592 | _IO_FILE *f; | |
593 | const void *data; | |
594 | _IO_ssize_t n; | |
595 | { | |
596 | _IO_ssize_t to_do = n; | |
597 | while (to_do > 0) | |
598 | { | |
599 | _IO_ssize_t count = write (f->_fileno, data, to_do); | |
600 | if (count == EOF) | |
601 | { | |
602 | f->_flags |= _IO_ERR_SEEN; | |
603 | break; | |
604 | } | |
605 | to_do -= count; | |
606 | data = (void *) ((char *) data + count); | |
607 | } | |
608 | n -= to_do; | |
609 | if (f->_old_offset >= 0) | |
610 | f->_old_offset += n; | |
611 | return n; | |
612 | } | |
613 | ||
614 | _IO_size_t | |
615 | _IO_old_file_xsputn (f, data, n) | |
616 | _IO_FILE *f; | |
617 | const void *data; | |
618 | _IO_size_t n; | |
619 | { | |
620 | register const char *s = (char *) data; | |
621 | _IO_size_t to_do = n; | |
622 | int must_flush = 0; | |
623 | _IO_size_t count; | |
624 | ||
625 | if (n <= 0) | |
626 | return 0; | |
627 | /* This is an optimized implementation. | |
628 | If the amount to be written straddles a block boundary | |
629 | (or the filebuf is unbuffered), use sys_write directly. */ | |
630 | ||
631 | /* First figure out how much space is available in the buffer. */ | |
632 | count = f->_IO_write_end - f->_IO_write_ptr; /* Space available. */ | |
633 | if ((f->_flags & _IO_LINE_BUF) && (f->_flags & _IO_CURRENTLY_PUTTING)) | |
634 | { | |
635 | count = f->_IO_buf_end - f->_IO_write_ptr; | |
636 | if (count >= n) | |
637 | { | |
638 | register const char *p; | |
639 | for (p = s + n; p > s; ) | |
640 | { | |
641 | if (*--p == '\n') | |
642 | { | |
643 | count = p - s + 1; | |
644 | must_flush = 1; | |
645 | break; | |
646 | } | |
647 | } | |
648 | } | |
649 | } | |
650 | /* Then fill the buffer. */ | |
651 | if (count > 0) | |
652 | { | |
653 | if (count > to_do) | |
654 | count = to_do; | |
655 | if (count > 20) | |
656 | { | |
657 | memcpy (f->_IO_write_ptr, s, count); | |
658 | s += count; | |
659 | } | |
660 | else | |
661 | { | |
662 | register char *p = f->_IO_write_ptr; | |
663 | register int i = (int) count; | |
664 | while (--i >= 0) | |
665 | *p++ = *s++; | |
666 | } | |
667 | f->_IO_write_ptr += count; | |
668 | to_do -= count; | |
669 | } | |
670 | if (to_do + must_flush > 0) | |
671 | { | |
672 | _IO_size_t block_size, dont_write; | |
673 | /* Next flush the (full) buffer. */ | |
674 | if (__overflow (f, EOF) == EOF) | |
675 | return n - to_do; | |
676 | ||
677 | /* Try to maintain alignment: write a whole number of blocks. | |
678 | dont_write is what gets left over. */ | |
679 | block_size = f->_IO_buf_end - f->_IO_buf_base; | |
680 | dont_write = block_size >= 128 ? to_do % block_size : 0; | |
681 | ||
682 | count = to_do - dont_write; | |
683 | if (_IO_do_write (f, s, count) == EOF) | |
684 | return n - to_do; | |
685 | to_do = dont_write; | |
686 | ||
687 | /* Now write out the remainder. Normally, this will fit in the | |
688 | buffer, but it's somewhat messier for line-buffered files, | |
689 | so we let _IO_default_xsputn handle the general case. */ | |
690 | if (dont_write) | |
691 | to_do -= _IO_default_xsputn (f, s+count, dont_write); | |
692 | } | |
693 | return n - to_do; | |
694 | } | |
695 | ||
696 | ||
697 | struct _IO_jump_t _IO_old_file_jumps = | |
698 | { | |
699 | JUMP_INIT_DUMMY, | |
700 | JUMP_INIT(finish, _IO_old_file_finish), | |
701 | JUMP_INIT(overflow, _IO_old_file_overflow), | |
702 | JUMP_INIT(underflow, _IO_old_file_underflow), | |
703 | JUMP_INIT(uflow, _IO_default_uflow), | |
704 | JUMP_INIT(pbackfail, _IO_default_pbackfail), | |
705 | JUMP_INIT(xsputn, _IO_old_file_xsputn), | |
706 | JUMP_INIT(xsgetn, _IO_default_xsgetn), | |
707 | JUMP_INIT(seekoff, _IO_old_file_seekoff), | |
708 | JUMP_INIT(seekpos, _IO_default_seekpos), | |
709 | JUMP_INIT(setbuf, _IO_old_file_setbuf), | |
710 | JUMP_INIT(sync, _IO_file_sync), | |
711 | JUMP_INIT(doallocate, _IO_file_doallocate), | |
712 | JUMP_INIT(read, _IO_file_read), | |
713 | JUMP_INIT(write, _IO_file_write), | |
714 | JUMP_INIT(seek, _IO_file_seek), | |
715 | JUMP_INIT(close, _IO_file_close), | |
716 | JUMP_INIT(stat, _IO_file_stat) | |
717 | }; | |
718 | ||
719 | ||
720 | #endif /* DO_VERSIONING */ |