1 | /* Copyright (C) 1993-2017 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | Written by Per Bothner <bothner@cygnus.com>. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. |
18 | |
19 | As a special exception, if you link the code in this file with |
20 | files compiled with a GNU compiler to produce an executable, |
21 | that does not cause the resulting executable to be covered by |
22 | the GNU Lesser General Public License. This exception does not |
23 | however invalidate any other reasons why the executable file |
24 | might be covered by the GNU Lesser General Public License. |
25 | This exception applies to code released by its copyright holders |
26 | in files containing the exception. */ |
27 | |
28 | /* This is a compatibility file. If we don't build the libc with |
29 | versioning don't compile this file. */ |
30 | #include <shlib-compat.h> |
31 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) |
32 | |
33 | #ifndef _POSIX_SOURCE |
34 | # define _POSIX_SOURCE |
35 | #endif |
36 | #define _IO_USE_OLD_IO_FILE |
37 | #include "libioP.h" |
38 | #include <fcntl.h> |
39 | #include <sys/types.h> |
40 | #include <sys/stat.h> |
41 | #include <string.h> |
42 | #include <errno.h> |
43 | #include <stdlib.h> |
44 | #include <unistd.h> |
45 | #ifndef errno |
46 | extern int errno; |
47 | #endif |
48 | #ifndef __set_errno |
49 | # define __set_errno(Val) errno = (Val) |
50 | #endif |
51 | |
52 | |
53 | #ifdef _LIBC |
54 | # define open(Name, Flags, Prot) __open (Name, Flags, Prot) |
55 | # define close(FD) __close (FD) |
56 | # define lseek(FD, Offset, Whence) __lseek (FD, Offset, Whence) |
57 | # define read(FD, Buf, NBytes) __read (FD, Buf, NBytes) |
58 | # define write(FD, Buf, NBytes) __write (FD, Buf, NBytes) |
59 | #endif |
60 | |
61 | /* An fstream can be in at most one of put mode, get mode, or putback mode. |
62 | Putback mode is a variant of get mode. |
63 | |
64 | In a filebuf, there is only one current position, instead of two |
65 | separate get and put pointers. In get mode, the current position |
66 | is that of gptr(); in put mode that of pptr(). |
67 | |
68 | The position in the buffer that corresponds to the position |
69 | in external file system is normally _IO_read_end, except in putback |
70 | mode, when it is _IO_save_end. |
71 | If the field _fb._offset is >= 0, it gives the offset in |
72 | the file as a whole corresponding to eGptr(). (?) |
73 | |
74 | PUT MODE: |
75 | If a filebuf is in put mode, then all of _IO_read_ptr, _IO_read_end, |
76 | and _IO_read_base are equal to each other. These are usually equal |
77 | to _IO_buf_base, though not necessarily if we have switched from |
78 | get mode to put mode. (The reason is to maintain the invariant |
79 | that _IO_read_end corresponds to the external file position.) |
80 | _IO_write_base is non-NULL and usually equal to _IO_buf_base. |
81 | We also have _IO_write_end == _IO_buf_end, but only in fully buffered mode. |
82 | The un-flushed character are those between _IO_write_base and _IO_write_ptr. |
83 | |
84 | GET MODE: |
85 | If a filebuf is in get or putback mode, eback() != egptr(). |
86 | In get mode, the unread characters are between gptr() and egptr(). |
87 | The OS file position corresponds to that of egptr(). |
88 | |
89 | PUTBACK MODE: |
90 | Putback mode is used to remember "excess" characters that have |
91 | been sputbackc'd in a separate putback buffer. |
92 | In putback mode, the get buffer points to the special putback buffer. |
93 | The unread characters are the characters between gptr() and egptr() |
94 | in the putback buffer, as well as the area between save_gptr() |
95 | and save_egptr(), which point into the original reserve buffer. |
96 | (The pointers save_gptr() and save_egptr() are the values |
97 | of gptr() and egptr() at the time putback mode was entered.) |
98 | The OS position corresponds to that of save_egptr(). |
99 | |
100 | LINE BUFFERED OUTPUT: |
101 | During line buffered output, _IO_write_base==base() && epptr()==base(). |
102 | However, ptr() may be anywhere between base() and ebuf(). |
103 | This forces a call to filebuf::overflow(int C) on every put. |
104 | If there is more space in the buffer, and C is not a '\n', |
105 | then C is inserted, and pptr() incremented. |
106 | |
107 | UNBUFFERED STREAMS: |
108 | If a filebuf is unbuffered(), the _shortbuf[1] is used as the buffer. |
109 | */ |
110 | |
111 | #define CLOSED_FILEBUF_FLAGS \ |
112 | (_IO_IS_FILEBUF+_IO_NO_READS+_IO_NO_WRITES+_IO_TIED_PUT_GET) |
113 | |
114 | |
115 | void |
116 | attribute_compat_text_section |
117 | _IO_old_file_init_internal (struct _IO_FILE_plus *fp) |
118 | { |
119 | /* POSIX.1 allows another file handle to be used to change the position |
120 | of our file descriptor. Hence we actually don't know the actual |
121 | position before we do the first fseek (and until a following fflush). */ |
122 | fp->file._old_offset = _IO_pos_BAD; |
123 | fp->file._IO_file_flags |= CLOSED_FILEBUF_FLAGS; |
124 | |
125 | _IO_link_in (fp); |
126 | fp->file._vtable_offset = ((int) sizeof (struct _IO_FILE) |
127 | - (int) sizeof (struct _IO_FILE_complete)); |
128 | fp->file._fileno = -1; |
129 | |
130 | #if defined SHARED && defined _LIBC |
131 | if (__builtin_expect (&_IO_stdin_used != NULL, 1) |
132 | || (fp != (struct _IO_FILE_plus *) _IO_stdin |
133 | && fp != (struct _IO_FILE_plus *) _IO_stdout |
134 | && fp != (struct _IO_FILE_plus *) _IO_stderr)) |
135 | /* The object is dynamically allocated and large enough. Initialize |
136 | the _mode element as well. */ |
137 | ((struct _IO_FILE_complete *) fp)->_mode = -1; |
138 | #endif |
139 | } |
140 | |
141 | void |
142 | attribute_compat_text_section |
143 | _IO_old_file_init (struct _IO_FILE_plus *fp) |
144 | { |
145 | IO_set_accept_foreign_vtables (&_IO_vtable_check); |
146 | _IO_old_file_init_internal (fp); |
147 | } |
148 | |
149 | int |
150 | attribute_compat_text_section |
151 | _IO_old_file_close_it (_IO_FILE *fp) |
152 | { |
153 | int write_status, close_status; |
154 | if (!_IO_file_is_open (fp)) |
155 | return EOF; |
156 | |
157 | write_status = _IO_old_do_flush (fp); |
158 | |
159 | _IO_unsave_markers (fp); |
160 | |
161 | close_status = ((fp->_flags2 & _IO_FLAGS2_NOCLOSE) == 0 |
162 | ? _IO_SYSCLOSE (fp) : 0); |
163 | |
164 | /* Free buffer. */ |
165 | _IO_setb (fp, NULL, NULL, 0); |
166 | _IO_setg (fp, NULL, NULL, NULL); |
167 | _IO_setp (fp, NULL, NULL); |
168 | |
169 | _IO_un_link ((struct _IO_FILE_plus *) fp); |
170 | fp->_flags = _IO_MAGIC|CLOSED_FILEBUF_FLAGS; |
171 | fp->_fileno = -1; |
172 | fp->_old_offset = _IO_pos_BAD; |
173 | |
174 | return close_status ? close_status : write_status; |
175 | } |
176 | |
177 | void |
178 | attribute_compat_text_section |
179 | _IO_old_file_finish (_IO_FILE *fp, int dummy) |
180 | { |
181 | if (_IO_file_is_open (fp)) |
182 | { |
183 | _IO_old_do_flush (fp); |
184 | if (!(fp->_flags & _IO_DELETE_DONT_CLOSE)) |
185 | _IO_SYSCLOSE (fp); |
186 | } |
187 | _IO_default_finish (fp, 0); |
188 | } |
189 | |
190 | _IO_FILE * |
191 | attribute_compat_text_section |
192 | _IO_old_file_fopen (_IO_FILE *fp, const char *filename, const char *mode) |
193 | { |
194 | int oflags = 0, omode; |
195 | int read_write, fdesc; |
196 | int oprot = 0666; |
197 | if (_IO_file_is_open (fp)) |
198 | return 0; |
199 | switch (*mode++) |
200 | { |
201 | case 'r': |
202 | omode = O_RDONLY; |
203 | read_write = _IO_NO_WRITES; |
204 | break; |
205 | case 'w': |
206 | omode = O_WRONLY; |
207 | oflags = O_CREAT|O_TRUNC; |
208 | read_write = _IO_NO_READS; |
209 | break; |
210 | case 'a': |
211 | omode = O_WRONLY; |
212 | oflags = O_CREAT|O_APPEND; |
213 | read_write = _IO_NO_READS|_IO_IS_APPENDING; |
214 | break; |
215 | default: |
216 | __set_errno (EINVAL); |
217 | return NULL; |
218 | } |
219 | if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+')) |
220 | { |
221 | omode = O_RDWR; |
222 | read_write &= _IO_IS_APPENDING; |
223 | } |
224 | fdesc = open (filename, omode|oflags, oprot); |
225 | if (fdesc < 0) |
226 | return NULL; |
227 | fp->_fileno = fdesc; |
228 | _IO_mask_flags (fp, read_write,_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); |
229 | if (read_write & _IO_IS_APPENDING) |
230 | if (_IO_SEEKOFF (fp, (_IO_off_t)0, _IO_seek_end, _IOS_INPUT|_IOS_OUTPUT) |
231 | == _IO_pos_BAD && errno != ESPIPE) |
232 | return NULL; |
233 | _IO_link_in ((struct _IO_FILE_plus *) fp); |
234 | return fp; |
235 | } |
236 | |
237 | _IO_FILE * |
238 | attribute_compat_text_section |
239 | _IO_old_file_attach (_IO_FILE *fp, int fd) |
240 | { |
241 | if (_IO_file_is_open (fp)) |
242 | return NULL; |
243 | fp->_fileno = fd; |
244 | fp->_flags &= ~(_IO_NO_READS+_IO_NO_WRITES); |
245 | fp->_flags |= _IO_DELETE_DONT_CLOSE; |
246 | /* Get the current position of the file. */ |
247 | /* We have to do that since that may be junk. */ |
248 | fp->_old_offset = _IO_pos_BAD; |
249 | if (_IO_SEEKOFF (fp, (_IO_off_t)0, _IO_seek_cur, _IOS_INPUT|_IOS_OUTPUT) |
250 | == _IO_pos_BAD && errno != ESPIPE) |
251 | return NULL; |
252 | return fp; |
253 | } |
254 | |
255 | _IO_FILE * |
256 | attribute_compat_text_section |
257 | _IO_old_file_setbuf (_IO_FILE *fp, char *p, _IO_ssize_t len) |
258 | { |
259 | if (_IO_default_setbuf (fp, p, len) == NULL) |
260 | return NULL; |
261 | |
262 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end |
263 | = fp->_IO_buf_base; |
264 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
265 | |
266 | return fp; |
267 | } |
268 | |
269 | static int old_do_write (_IO_FILE *, const char *, _IO_size_t); |
270 | |
271 | /* Write TO_DO bytes from DATA to FP. |
272 | Then mark FP as having empty buffers. */ |
273 | |
274 | int |
275 | attribute_compat_text_section |
276 | _IO_old_do_write (_IO_FILE *fp, const char *data, _IO_size_t to_do) |
277 | { |
278 | return (to_do == 0 || (_IO_size_t) old_do_write (fp, data, to_do) == to_do) |
279 | ? 0 : EOF; |
280 | } |
281 | |
282 | static int |
283 | attribute_compat_text_section |
284 | old_do_write (_IO_FILE *fp, const char *data, _IO_size_t to_do) |
285 | { |
286 | _IO_size_t count; |
287 | if (fp->_flags & _IO_IS_APPENDING) |
288 | /* On a system without a proper O_APPEND implementation, |
289 | you would need to sys_seek(0, SEEK_END) here, but is |
290 | not needed nor desirable for Unix- or Posix-like systems. |
291 | Instead, just indicate that offset (before and after) is |
292 | unpredictable. */ |
293 | fp->_old_offset = _IO_pos_BAD; |
294 | else if (fp->_IO_read_end != fp->_IO_write_base) |
295 | { |
296 | _IO_off_t new_pos |
297 | = _IO_SYSSEEK (fp, fp->_IO_write_base - fp->_IO_read_end, 1); |
298 | if (new_pos == _IO_pos_BAD) |
299 | return 0; |
300 | fp->_old_offset = new_pos; |
301 | } |
302 | count = _IO_SYSWRITE (fp, data, to_do); |
303 | if (fp->_cur_column && count) |
304 | fp->_cur_column = _IO_adjust_column (fp->_cur_column - 1, data, count) + 1; |
305 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
306 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_buf_base; |
307 | fp->_IO_write_end = ((fp->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED)) |
308 | ? fp->_IO_buf_base : fp->_IO_buf_end); |
309 | return count; |
310 | } |
311 | |
312 | int |
313 | attribute_compat_text_section |
314 | _IO_old_file_underflow (_IO_FILE *fp) |
315 | { |
316 | _IO_ssize_t count; |
317 | #if 0 |
318 | /* SysV does not make this test; take it out for compatibility */ |
319 | if (fp->_flags & _IO_EOF_SEEN) |
320 | return (EOF); |
321 | #endif |
322 | |
323 | if (fp->_flags & _IO_NO_READS) |
324 | { |
325 | fp->_flags |= _IO_ERR_SEEN; |
326 | __set_errno (EBADF); |
327 | return EOF; |
328 | } |
329 | if (fp->_IO_read_ptr < fp->_IO_read_end) |
330 | return *(unsigned char *) fp->_IO_read_ptr; |
331 | |
332 | if (fp->_IO_buf_base == NULL) |
333 | { |
334 | /* Maybe we already have a push back pointer. */ |
335 | if (fp->_IO_save_base != NULL) |
336 | { |
337 | free (fp->_IO_save_base); |
338 | fp->_flags &= ~_IO_IN_BACKUP; |
339 | } |
340 | _IO_doallocbuf (fp); |
341 | } |
342 | |
343 | /* Flush all line buffered files before reading. */ |
344 | /* FIXME This can/should be moved to genops ?? */ |
345 | if (fp->_flags & (_IO_LINE_BUF|_IO_UNBUFFERED)) |
346 | _IO_flush_all_linebuffered (); |
347 | |
348 | _IO_switch_to_get_mode (fp); |
349 | |
350 | /* This is very tricky. We have to adjust those |
351 | pointers before we call _IO_SYSREAD () since |
352 | we may longjump () out while waiting for |
353 | input. Those pointers may be screwed up. H.J. */ |
354 | fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_buf_base; |
355 | fp->_IO_read_end = fp->_IO_buf_base; |
356 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end |
357 | = fp->_IO_buf_base; |
358 | |
359 | count = _IO_SYSREAD (fp, fp->_IO_buf_base, |
360 | fp->_IO_buf_end - fp->_IO_buf_base); |
361 | if (count <= 0) |
362 | { |
363 | if (count == 0) |
364 | fp->_flags |= _IO_EOF_SEEN; |
365 | else |
366 | fp->_flags |= _IO_ERR_SEEN, count = 0; |
367 | } |
368 | fp->_IO_read_end += count; |
369 | if (count == 0) |
370 | return EOF; |
371 | if (fp->_old_offset != _IO_pos_BAD) |
372 | _IO_pos_adjust (fp->_old_offset, count); |
373 | return *(unsigned char *) fp->_IO_read_ptr; |
374 | } |
375 | |
376 | int |
377 | attribute_compat_text_section |
378 | _IO_old_file_overflow (_IO_FILE *f, int ch) |
379 | { |
380 | if (f->_flags & _IO_NO_WRITES) /* SET ERROR */ |
381 | { |
382 | f->_flags |= _IO_ERR_SEEN; |
383 | __set_errno (EBADF); |
384 | return EOF; |
385 | } |
386 | /* If currently reading or no buffer allocated. */ |
387 | if ((f->_flags & _IO_CURRENTLY_PUTTING) == 0) |
388 | { |
389 | /* Allocate a buffer if needed. */ |
390 | if (f->_IO_write_base == 0) |
391 | { |
392 | _IO_doallocbuf (f); |
393 | _IO_setg (f, f->_IO_buf_base, f->_IO_buf_base, f->_IO_buf_base); |
394 | } |
395 | /* Otherwise must be currently reading. |
396 | If _IO_read_ptr (and hence also _IO_read_end) is at the buffer end, |
397 | logically slide the buffer forwards one block (by setting the |
398 | read pointers to all point at the beginning of the block). This |
399 | makes room for subsequent output. |
400 | Otherwise, set the read pointers to _IO_read_end (leaving that |
401 | alone, so it can continue to correspond to the external position). */ |
402 | if (f->_IO_read_ptr == f->_IO_buf_end) |
403 | f->_IO_read_end = f->_IO_read_ptr = f->_IO_buf_base; |
404 | f->_IO_write_ptr = f->_IO_read_ptr; |
405 | f->_IO_write_base = f->_IO_write_ptr; |
406 | f->_IO_write_end = f->_IO_buf_end; |
407 | f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end; |
408 | |
409 | if (f->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED)) |
410 | f->_IO_write_end = f->_IO_write_ptr; |
411 | f->_flags |= _IO_CURRENTLY_PUTTING; |
412 | } |
413 | if (ch == EOF) |
414 | return _IO_old_do_flush (f); |
415 | if (f->_IO_write_ptr == f->_IO_buf_end ) /* Buffer is really full */ |
416 | if (_IO_old_do_flush (f) == EOF) |
417 | return EOF; |
418 | *f->_IO_write_ptr++ = ch; |
419 | if ((f->_flags & _IO_UNBUFFERED) |
420 | || ((f->_flags & _IO_LINE_BUF) && ch == '\n')) |
421 | if (_IO_old_do_flush (f) == EOF) |
422 | return EOF; |
423 | return (unsigned char) ch; |
424 | } |
425 | |
426 | int |
427 | attribute_compat_text_section |
428 | _IO_old_file_sync (_IO_FILE *fp) |
429 | { |
430 | _IO_ssize_t delta; |
431 | int retval = 0; |
432 | |
433 | /* char* ptr = cur_ptr(); */ |
434 | if (fp->_IO_write_ptr > fp->_IO_write_base) |
435 | if (_IO_old_do_flush(fp)) return EOF; |
436 | delta = fp->_IO_read_ptr - fp->_IO_read_end; |
437 | if (delta != 0) |
438 | { |
439 | #ifdef TODO |
440 | if (_IO_in_backup (fp)) |
441 | delta -= eGptr () - Gbase (); |
442 | #endif |
443 | _IO_off_t new_pos = _IO_SYSSEEK (fp, delta, 1); |
444 | if (new_pos != (_IO_off_t) EOF) |
445 | fp->_IO_read_end = fp->_IO_read_ptr; |
446 | #ifdef ESPIPE |
447 | else if (errno == ESPIPE) |
448 | ; /* Ignore error from unseekable devices. */ |
449 | #endif |
450 | else |
451 | retval = EOF; |
452 | } |
453 | if (retval != EOF) |
454 | fp->_old_offset = _IO_pos_BAD; |
455 | /* FIXME: Cleanup - can this be shared? */ |
456 | /* setg(base(), ptr, ptr); */ |
457 | return retval; |
458 | } |
459 | |
460 | _IO_off64_t |
461 | attribute_compat_text_section |
462 | _IO_old_file_seekoff (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode) |
463 | { |
464 | _IO_off_t result; |
465 | _IO_off64_t delta, new_offset; |
466 | long count; |
467 | /* POSIX.1 8.2.3.7 says that after a call the fflush() the file |
468 | offset of the underlying file must be exact. */ |
469 | int must_be_exact = (fp->_IO_read_base == fp->_IO_read_end |
470 | && fp->_IO_write_base == fp->_IO_write_ptr); |
471 | |
472 | if (mode == 0) |
473 | dir = _IO_seek_cur, offset = 0; /* Don't move any pointers. */ |
474 | |
475 | /* Flush unwritten characters. |
476 | (This may do an unneeded write if we seek within the buffer. |
477 | But to be able to switch to reading, we would need to set |
478 | egptr to pptr. That can't be done in the current design, |
479 | which assumes file_ptr() is eGptr. Anyway, since we probably |
480 | end up flushing when we close(), it doesn't make much difference.) |
481 | FIXME: simulate mem-mapped files. */ |
482 | |
483 | if (fp->_IO_write_ptr > fp->_IO_write_base || _IO_in_put_mode (fp)) |
484 | if (_IO_switch_to_get_mode (fp)) |
485 | return EOF; |
486 | |
487 | if (fp->_IO_buf_base == NULL) |
488 | { |
489 | /* It could be that we already have a pushback buffer. */ |
490 | if (fp->_IO_read_base != NULL) |
491 | { |
492 | free (fp->_IO_read_base); |
493 | fp->_flags &= ~_IO_IN_BACKUP; |
494 | } |
495 | _IO_doallocbuf (fp); |
496 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
497 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
498 | } |
499 | |
500 | switch (dir) |
501 | { |
502 | case _IO_seek_cur: |
503 | /* Adjust for read-ahead (bytes is buffer). */ |
504 | offset -= fp->_IO_read_end - fp->_IO_read_ptr; |
505 | if (fp->_old_offset == _IO_pos_BAD) |
506 | goto dumb; |
507 | /* Make offset absolute, assuming current pointer is file_ptr(). */ |
508 | offset += fp->_old_offset; |
509 | |
510 | dir = _IO_seek_set; |
511 | break; |
512 | case _IO_seek_set: |
513 | break; |
514 | case _IO_seek_end: |
515 | { |
516 | struct stat64 st; |
517 | if (_IO_SYSSTAT (fp, &st) == 0 && S_ISREG (st.st_mode)) |
518 | { |
519 | offset += st.st_size; |
520 | dir = _IO_seek_set; |
521 | } |
522 | else |
523 | goto dumb; |
524 | } |
525 | } |
526 | /* At this point, dir==_IO_seek_set. */ |
527 | |
528 | /* If we are only interested in the current position we've found it now. */ |
529 | if (mode == 0) |
530 | return offset; |
531 | |
532 | /* If destination is within current buffer, optimize: */ |
533 | if (fp->_old_offset != _IO_pos_BAD && fp->_IO_read_base != NULL |
534 | && !_IO_in_backup (fp)) |
535 | { |
536 | /* Offset relative to start of main get area. */ |
537 | _IO_off_t rel_offset = (offset - fp->_old_offset |
538 | + (fp->_IO_read_end - fp->_IO_read_base)); |
539 | if (rel_offset >= 0) |
540 | { |
541 | #if 0 |
542 | if (_IO_in_backup (fp)) |
543 | _IO_switch_to_main_get_area (fp); |
544 | #endif |
545 | if (rel_offset <= fp->_IO_read_end - fp->_IO_read_base) |
546 | { |
547 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + rel_offset, |
548 | fp->_IO_read_end); |
549 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
550 | { |
551 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
552 | goto resync; |
553 | } |
554 | } |
555 | #ifdef TODO |
556 | /* If we have streammarkers, seek forward by reading ahead. */ |
557 | if (_IO_have_markers (fp)) |
558 | { |
559 | int to_skip = rel_offset |
560 | - (fp->_IO_read_ptr - fp->_IO_read_base); |
561 | if (ignore (to_skip) != to_skip) |
562 | goto dumb; |
563 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
564 | goto resync; |
565 | } |
566 | #endif |
567 | } |
568 | #ifdef TODO |
569 | if (rel_offset < 0 && rel_offset >= Bbase () - Bptr ()) |
570 | { |
571 | if (!_IO_in_backup (fp)) |
572 | _IO_switch_to_backup_area (fp); |
573 | gbump (fp->_IO_read_end + rel_offset - fp->_IO_read_ptr); |
574 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
575 | goto resync; |
576 | } |
577 | #endif |
578 | } |
579 | |
580 | #ifdef TODO |
581 | _IO_unsave_markers (fp); |
582 | #endif |
583 | |
584 | if (fp->_flags & _IO_NO_READS) |
585 | goto dumb; |
586 | |
587 | /* Try to seek to a block boundary, to improve kernel page management. */ |
588 | new_offset = offset & ~(fp->_IO_buf_end - fp->_IO_buf_base - 1); |
589 | delta = offset - new_offset; |
590 | if (delta > fp->_IO_buf_end - fp->_IO_buf_base) |
591 | { |
592 | new_offset = offset; |
593 | delta = 0; |
594 | } |
595 | result = _IO_SYSSEEK (fp, new_offset, 0); |
596 | if (result < 0) |
597 | return EOF; |
598 | if (delta == 0) |
599 | count = 0; |
600 | else |
601 | { |
602 | count = _IO_SYSREAD (fp, fp->_IO_buf_base, |
603 | (must_be_exact |
604 | ? delta : fp->_IO_buf_end - fp->_IO_buf_base)); |
605 | if (count < delta) |
606 | { |
607 | /* We weren't allowed to read, but try to seek the remainder. */ |
608 | offset = count == EOF ? delta : delta-count; |
609 | dir = _IO_seek_cur; |
610 | goto dumb; |
611 | } |
612 | } |
613 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + delta, |
614 | fp->_IO_buf_base + count); |
615 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
616 | fp->_old_offset = result + count; |
617 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
618 | return offset; |
619 | dumb: |
620 | |
621 | _IO_unsave_markers (fp); |
622 | result = _IO_SYSSEEK (fp, offset, dir); |
623 | if (result != EOF) |
624 | { |
625 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
626 | fp->_old_offset = result; |
627 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
628 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
629 | } |
630 | return result; |
631 | |
632 | resync: |
633 | /* We need to do it since it is possible that the file offset in |
634 | the kernel may be changed behind our back. It may happen when |
635 | we fopen a file and then do a fork. One process may access the |
636 | file and the kernel file offset will be changed. */ |
637 | if (fp->_old_offset >= 0) |
638 | _IO_SYSSEEK (fp, fp->_old_offset, 0); |
639 | |
640 | return offset; |
641 | } |
642 | |
643 | _IO_ssize_t |
644 | attribute_compat_text_section |
645 | _IO_old_file_write (_IO_FILE *f, const void *data, _IO_ssize_t n) |
646 | { |
647 | _IO_ssize_t to_do = n; |
648 | while (to_do > 0) |
649 | { |
650 | _IO_ssize_t count = write (f->_fileno, data, to_do); |
651 | if (count == EOF) |
652 | { |
653 | f->_flags |= _IO_ERR_SEEN; |
654 | break; |
655 | } |
656 | to_do -= count; |
657 | data = (void *) ((char *) data + count); |
658 | } |
659 | n -= to_do; |
660 | if (f->_old_offset >= 0) |
661 | f->_old_offset += n; |
662 | return n; |
663 | } |
664 | |
665 | _IO_size_t |
666 | attribute_compat_text_section |
667 | _IO_old_file_xsputn (_IO_FILE *f, const void *data, _IO_size_t n) |
668 | { |
669 | const char *s = (char *) data; |
670 | _IO_size_t to_do = n; |
671 | int must_flush = 0; |
672 | _IO_size_t count = 0; |
673 | |
674 | if (n <= 0) |
675 | return 0; |
676 | /* This is an optimized implementation. |
677 | If the amount to be written straddles a block boundary |
678 | (or the filebuf is unbuffered), use sys_write directly. */ |
679 | |
680 | /* First figure out how much space is available in the buffer. */ |
681 | if ((f->_flags & _IO_LINE_BUF) && (f->_flags & _IO_CURRENTLY_PUTTING)) |
682 | { |
683 | count = f->_IO_buf_end - f->_IO_write_ptr; |
684 | if (count >= n) |
685 | { |
686 | const char *p; |
687 | for (p = s + n; p > s; ) |
688 | { |
689 | if (*--p == '\n') |
690 | { |
691 | count = p - s + 1; |
692 | must_flush = 1; |
693 | break; |
694 | } |
695 | } |
696 | } |
697 | } |
698 | else if (f->_IO_write_end > f->_IO_write_ptr) |
699 | count = f->_IO_write_end - f->_IO_write_ptr; /* Space available. */ |
700 | |
701 | /* Then fill the buffer. */ |
702 | if (count > 0) |
703 | { |
704 | if (count > to_do) |
705 | count = to_do; |
706 | if (count > 20) |
707 | { |
708 | #ifdef _LIBC |
709 | f->_IO_write_ptr = __mempcpy (f->_IO_write_ptr, s, count); |
710 | #else |
711 | memcpy (f->_IO_write_ptr, s, count); |
712 | f->_IO_write_ptr += count; |
713 | #endif |
714 | s += count; |
715 | } |
716 | else |
717 | { |
718 | char *p = f->_IO_write_ptr; |
719 | int i = (int) count; |
720 | while (--i >= 0) |
721 | *p++ = *s++; |
722 | f->_IO_write_ptr = p; |
723 | } |
724 | to_do -= count; |
725 | } |
726 | if (to_do + must_flush > 0) |
727 | { |
728 | _IO_size_t block_size, do_write; |
729 | /* Next flush the (full) buffer. */ |
730 | if (__overflow (f, EOF) == EOF) |
731 | return to_do == 0 ? EOF : n - to_do; |
732 | |
733 | /* Try to maintain alignment: write a whole number of blocks. |
734 | dont_write is what gets left over. */ |
735 | block_size = f->_IO_buf_end - f->_IO_buf_base; |
736 | do_write = to_do - (block_size >= 128 ? to_do % block_size : 0); |
737 | |
738 | if (do_write) |
739 | { |
740 | count = old_do_write (f, s, do_write); |
741 | to_do -= count; |
742 | if (count < do_write) |
743 | return n - to_do; |
744 | } |
745 | |
746 | /* Now write out the remainder. Normally, this will fit in the |
747 | buffer, but it's somewhat messier for line-buffered files, |
748 | so we let _IO_default_xsputn handle the general case. */ |
749 | if (to_do) |
750 | to_do -= _IO_default_xsputn (f, s+do_write, to_do); |
751 | } |
752 | return n - to_do; |
753 | } |
754 | |
755 | |
756 | const struct _IO_jump_t _IO_old_file_jumps libio_vtable = |
757 | { |
758 | JUMP_INIT_DUMMY, |
759 | JUMP_INIT(finish, _IO_old_file_finish), |
760 | JUMP_INIT(overflow, _IO_old_file_overflow), |
761 | JUMP_INIT(underflow, _IO_old_file_underflow), |
762 | JUMP_INIT(uflow, _IO_default_uflow), |
763 | JUMP_INIT(pbackfail, _IO_default_pbackfail), |
764 | JUMP_INIT(xsputn, _IO_old_file_xsputn), |
765 | JUMP_INIT(xsgetn, _IO_default_xsgetn), |
766 | JUMP_INIT(seekoff, _IO_old_file_seekoff), |
767 | JUMP_INIT(seekpos, _IO_default_seekpos), |
768 | JUMP_INIT(setbuf, _IO_old_file_setbuf), |
769 | JUMP_INIT(sync, _IO_old_file_sync), |
770 | JUMP_INIT(doallocate, _IO_file_doallocate), |
771 | JUMP_INIT(read, _IO_file_read), |
772 | JUMP_INIT(write, _IO_old_file_write), |
773 | JUMP_INIT(seek, _IO_file_seek), |
774 | JUMP_INIT(close, _IO_file_close), |
775 | JUMP_INIT(stat, _IO_file_stat) |
776 | }; |
777 | |
778 | compat_symbol (libc, _IO_old_do_write, _IO_do_write, GLIBC_2_0); |
779 | compat_symbol (libc, _IO_old_file_attach, _IO_file_attach, GLIBC_2_0); |
780 | compat_symbol (libc, _IO_old_file_close_it, _IO_file_close_it, GLIBC_2_0); |
781 | compat_symbol (libc, _IO_old_file_finish, _IO_file_finish, GLIBC_2_0); |
782 | compat_symbol (libc, _IO_old_file_fopen, _IO_file_fopen, GLIBC_2_0); |
783 | compat_symbol (libc, _IO_old_file_init, _IO_file_init, GLIBC_2_0); |
784 | compat_symbol (libc, _IO_old_file_setbuf, _IO_file_setbuf, GLIBC_2_0); |
785 | compat_symbol (libc, _IO_old_file_sync, _IO_file_sync, GLIBC_2_0); |
786 | compat_symbol (libc, _IO_old_file_overflow, _IO_file_overflow, GLIBC_2_0); |
787 | compat_symbol (libc, _IO_old_file_seekoff, _IO_file_seekoff, GLIBC_2_0); |
788 | compat_symbol (libc, _IO_old_file_underflow, _IO_file_underflow, GLIBC_2_0); |
789 | compat_symbol (libc, _IO_old_file_write, _IO_file_write, GLIBC_2_0); |
790 | compat_symbol (libc, _IO_old_file_xsputn, _IO_file_xsputn, GLIBC_2_0); |
791 | |
792 | #endif |
793 | |