1 | /* Copyright (C) 1993-2016 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 (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 | int |
142 | attribute_compat_text_section |
143 | _IO_old_file_close_it (_IO_FILE *fp) |
144 | { |
145 | int write_status, close_status; |
146 | if (!_IO_file_is_open (fp)) |
147 | return EOF; |
148 | |
149 | write_status = _IO_old_do_flush (fp); |
150 | |
151 | _IO_unsave_markers (fp); |
152 | |
153 | close_status = ((fp->_flags2 & _IO_FLAGS2_NOCLOSE) == 0 |
154 | ? _IO_SYSCLOSE (fp) : 0); |
155 | |
156 | /* Free buffer. */ |
157 | _IO_setb (fp, NULL, NULL, 0); |
158 | _IO_setg (fp, NULL, NULL, NULL); |
159 | _IO_setp (fp, NULL, NULL); |
160 | |
161 | _IO_un_link ((struct _IO_FILE_plus *) fp); |
162 | fp->_flags = _IO_MAGIC|CLOSED_FILEBUF_FLAGS; |
163 | fp->_fileno = -1; |
164 | fp->_old_offset = _IO_pos_BAD; |
165 | |
166 | return close_status ? close_status : write_status; |
167 | } |
168 | |
169 | void |
170 | attribute_compat_text_section |
171 | _IO_old_file_finish (_IO_FILE *fp, int dummy) |
172 | { |
173 | if (_IO_file_is_open (fp)) |
174 | { |
175 | _IO_old_do_flush (fp); |
176 | if (!(fp->_flags & _IO_DELETE_DONT_CLOSE)) |
177 | _IO_SYSCLOSE (fp); |
178 | } |
179 | _IO_default_finish (fp, 0); |
180 | } |
181 | |
182 | _IO_FILE * |
183 | attribute_compat_text_section |
184 | _IO_old_file_fopen (_IO_FILE *fp, const char *filename, const char *mode) |
185 | { |
186 | int oflags = 0, omode; |
187 | int read_write, fdesc; |
188 | int oprot = 0666; |
189 | if (_IO_file_is_open (fp)) |
190 | return 0; |
191 | switch (*mode++) |
192 | { |
193 | case 'r': |
194 | omode = O_RDONLY; |
195 | read_write = _IO_NO_WRITES; |
196 | break; |
197 | case 'w': |
198 | omode = O_WRONLY; |
199 | oflags = O_CREAT|O_TRUNC; |
200 | read_write = _IO_NO_READS; |
201 | break; |
202 | case 'a': |
203 | omode = O_WRONLY; |
204 | oflags = O_CREAT|O_APPEND; |
205 | read_write = _IO_NO_READS|_IO_IS_APPENDING; |
206 | break; |
207 | default: |
208 | __set_errno (EINVAL); |
209 | return NULL; |
210 | } |
211 | if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+')) |
212 | { |
213 | omode = O_RDWR; |
214 | read_write &= _IO_IS_APPENDING; |
215 | } |
216 | fdesc = open (filename, omode|oflags, oprot); |
217 | if (fdesc < 0) |
218 | return NULL; |
219 | fp->_fileno = fdesc; |
220 | _IO_mask_flags (fp, read_write,_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); |
221 | if (read_write & _IO_IS_APPENDING) |
222 | if (_IO_SEEKOFF (fp, (_IO_off_t)0, _IO_seek_end, _IOS_INPUT|_IOS_OUTPUT) |
223 | == _IO_pos_BAD && errno != ESPIPE) |
224 | return NULL; |
225 | _IO_link_in ((struct _IO_FILE_plus *) fp); |
226 | return fp; |
227 | } |
228 | |
229 | _IO_FILE * |
230 | attribute_compat_text_section |
231 | _IO_old_file_attach (_IO_FILE *fp, int fd) |
232 | { |
233 | if (_IO_file_is_open (fp)) |
234 | return NULL; |
235 | fp->_fileno = fd; |
236 | fp->_flags &= ~(_IO_NO_READS+_IO_NO_WRITES); |
237 | fp->_flags |= _IO_DELETE_DONT_CLOSE; |
238 | /* Get the current position of the file. */ |
239 | /* We have to do that since that may be junk. */ |
240 | fp->_old_offset = _IO_pos_BAD; |
241 | if (_IO_SEEKOFF (fp, (_IO_off_t)0, _IO_seek_cur, _IOS_INPUT|_IOS_OUTPUT) |
242 | == _IO_pos_BAD && errno != ESPIPE) |
243 | return NULL; |
244 | return fp; |
245 | } |
246 | |
247 | _IO_FILE * |
248 | attribute_compat_text_section |
249 | _IO_old_file_setbuf (_IO_FILE *fp, char *p, _IO_ssize_t len) |
250 | { |
251 | if (_IO_default_setbuf (fp, p, len) == NULL) |
252 | return NULL; |
253 | |
254 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end |
255 | = fp->_IO_buf_base; |
256 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
257 | |
258 | return fp; |
259 | } |
260 | |
261 | static int old_do_write (_IO_FILE *, const char *, _IO_size_t); |
262 | |
263 | /* Write TO_DO bytes from DATA to FP. |
264 | Then mark FP as having empty buffers. */ |
265 | |
266 | int |
267 | attribute_compat_text_section |
268 | _IO_old_do_write (_IO_FILE *fp, const char *data, _IO_size_t to_do) |
269 | { |
270 | return (to_do == 0 || (_IO_size_t) old_do_write (fp, data, to_do) == to_do) |
271 | ? 0 : EOF; |
272 | } |
273 | |
274 | static int |
275 | attribute_compat_text_section |
276 | old_do_write (_IO_FILE *fp, const char *data, _IO_size_t to_do) |
277 | { |
278 | _IO_size_t count; |
279 | if (fp->_flags & _IO_IS_APPENDING) |
280 | /* On a system without a proper O_APPEND implementation, |
281 | you would need to sys_seek(0, SEEK_END) here, but is |
282 | not needed nor desirable for Unix- or Posix-like systems. |
283 | Instead, just indicate that offset (before and after) is |
284 | unpredictable. */ |
285 | fp->_old_offset = _IO_pos_BAD; |
286 | else if (fp->_IO_read_end != fp->_IO_write_base) |
287 | { |
288 | _IO_off_t new_pos |
289 | = _IO_SYSSEEK (fp, fp->_IO_write_base - fp->_IO_read_end, 1); |
290 | if (new_pos == _IO_pos_BAD) |
291 | return 0; |
292 | fp->_old_offset = new_pos; |
293 | } |
294 | count = _IO_SYSWRITE (fp, data, to_do); |
295 | if (fp->_cur_column && count) |
296 | fp->_cur_column = _IO_adjust_column (fp->_cur_column - 1, data, count) + 1; |
297 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
298 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_buf_base; |
299 | fp->_IO_write_end = ((fp->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED)) |
300 | ? fp->_IO_buf_base : fp->_IO_buf_end); |
301 | return count; |
302 | } |
303 | |
304 | int |
305 | attribute_compat_text_section |
306 | _IO_old_file_underflow (_IO_FILE *fp) |
307 | { |
308 | _IO_ssize_t count; |
309 | #if 0 |
310 | /* SysV does not make this test; take it out for compatibility */ |
311 | if (fp->_flags & _IO_EOF_SEEN) |
312 | return (EOF); |
313 | #endif |
314 | |
315 | if (fp->_flags & _IO_NO_READS) |
316 | { |
317 | fp->_flags |= _IO_ERR_SEEN; |
318 | __set_errno (EBADF); |
319 | return EOF; |
320 | } |
321 | if (fp->_IO_read_ptr < fp->_IO_read_end) |
322 | return *(unsigned char *) fp->_IO_read_ptr; |
323 | |
324 | if (fp->_IO_buf_base == NULL) |
325 | { |
326 | /* Maybe we already have a push back pointer. */ |
327 | if (fp->_IO_save_base != NULL) |
328 | { |
329 | free (fp->_IO_save_base); |
330 | fp->_flags &= ~_IO_IN_BACKUP; |
331 | } |
332 | _IO_doallocbuf (fp); |
333 | } |
334 | |
335 | /* Flush all line buffered files before reading. */ |
336 | /* FIXME This can/should be moved to genops ?? */ |
337 | if (fp->_flags & (_IO_LINE_BUF|_IO_UNBUFFERED)) |
338 | _IO_flush_all_linebuffered (); |
339 | |
340 | _IO_switch_to_get_mode (fp); |
341 | |
342 | /* This is very tricky. We have to adjust those |
343 | pointers before we call _IO_SYSREAD () since |
344 | we may longjump () out while waiting for |
345 | input. Those pointers may be screwed up. H.J. */ |
346 | fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_buf_base; |
347 | fp->_IO_read_end = fp->_IO_buf_base; |
348 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end |
349 | = fp->_IO_buf_base; |
350 | |
351 | count = _IO_SYSREAD (fp, fp->_IO_buf_base, |
352 | fp->_IO_buf_end - fp->_IO_buf_base); |
353 | if (count <= 0) |
354 | { |
355 | if (count == 0) |
356 | fp->_flags |= _IO_EOF_SEEN; |
357 | else |
358 | fp->_flags |= _IO_ERR_SEEN, count = 0; |
359 | } |
360 | fp->_IO_read_end += count; |
361 | if (count == 0) |
362 | return EOF; |
363 | if (fp->_old_offset != _IO_pos_BAD) |
364 | _IO_pos_adjust (fp->_old_offset, count); |
365 | return *(unsigned char *) fp->_IO_read_ptr; |
366 | } |
367 | |
368 | int |
369 | attribute_compat_text_section |
370 | _IO_old_file_overflow (_IO_FILE *f, int ch) |
371 | { |
372 | if (f->_flags & _IO_NO_WRITES) /* SET ERROR */ |
373 | { |
374 | f->_flags |= _IO_ERR_SEEN; |
375 | __set_errno (EBADF); |
376 | return EOF; |
377 | } |
378 | /* If currently reading or no buffer allocated. */ |
379 | if ((f->_flags & _IO_CURRENTLY_PUTTING) == 0) |
380 | { |
381 | /* Allocate a buffer if needed. */ |
382 | if (f->_IO_write_base == 0) |
383 | { |
384 | _IO_doallocbuf (f); |
385 | _IO_setg (f, f->_IO_buf_base, f->_IO_buf_base, f->_IO_buf_base); |
386 | } |
387 | /* Otherwise must be currently reading. |
388 | If _IO_read_ptr (and hence also _IO_read_end) is at the buffer end, |
389 | logically slide the buffer forwards one block (by setting the |
390 | read pointers to all point at the beginning of the block). This |
391 | makes room for subsequent output. |
392 | Otherwise, set the read pointers to _IO_read_end (leaving that |
393 | alone, so it can continue to correspond to the external position). */ |
394 | if (f->_IO_read_ptr == f->_IO_buf_end) |
395 | f->_IO_read_end = f->_IO_read_ptr = f->_IO_buf_base; |
396 | f->_IO_write_ptr = f->_IO_read_ptr; |
397 | f->_IO_write_base = f->_IO_write_ptr; |
398 | f->_IO_write_end = f->_IO_buf_end; |
399 | f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end; |
400 | |
401 | if (f->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED)) |
402 | f->_IO_write_end = f->_IO_write_ptr; |
403 | f->_flags |= _IO_CURRENTLY_PUTTING; |
404 | } |
405 | if (ch == EOF) |
406 | return _IO_old_do_flush (f); |
407 | if (f->_IO_write_ptr == f->_IO_buf_end ) /* Buffer is really full */ |
408 | if (_IO_old_do_flush (f) == EOF) |
409 | return EOF; |
410 | *f->_IO_write_ptr++ = ch; |
411 | if ((f->_flags & _IO_UNBUFFERED) |
412 | || ((f->_flags & _IO_LINE_BUF) && ch == '\n')) |
413 | if (_IO_old_do_flush (f) == EOF) |
414 | return EOF; |
415 | return (unsigned char) ch; |
416 | } |
417 | |
418 | int |
419 | attribute_compat_text_section |
420 | _IO_old_file_sync (_IO_FILE *fp) |
421 | { |
422 | _IO_ssize_t delta; |
423 | int retval = 0; |
424 | |
425 | /* char* ptr = cur_ptr(); */ |
426 | if (fp->_IO_write_ptr > fp->_IO_write_base) |
427 | if (_IO_old_do_flush(fp)) return EOF; |
428 | delta = fp->_IO_read_ptr - fp->_IO_read_end; |
429 | if (delta != 0) |
430 | { |
431 | #ifdef TODO |
432 | if (_IO_in_backup (fp)) |
433 | delta -= eGptr () - Gbase (); |
434 | #endif |
435 | _IO_off_t new_pos = _IO_SYSSEEK (fp, delta, 1); |
436 | if (new_pos != (_IO_off_t) EOF) |
437 | fp->_IO_read_end = fp->_IO_read_ptr; |
438 | #ifdef ESPIPE |
439 | else if (errno == ESPIPE) |
440 | ; /* Ignore error from unseekable devices. */ |
441 | #endif |
442 | else |
443 | retval = EOF; |
444 | } |
445 | if (retval != EOF) |
446 | fp->_old_offset = _IO_pos_BAD; |
447 | /* FIXME: Cleanup - can this be shared? */ |
448 | /* setg(base(), ptr, ptr); */ |
449 | return retval; |
450 | } |
451 | |
452 | _IO_off64_t |
453 | attribute_compat_text_section |
454 | _IO_old_file_seekoff (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode) |
455 | { |
456 | _IO_off_t result; |
457 | _IO_off64_t delta, new_offset; |
458 | long count; |
459 | /* POSIX.1 8.2.3.7 says that after a call the fflush() the file |
460 | offset of the underlying file must be exact. */ |
461 | int must_be_exact = (fp->_IO_read_base == fp->_IO_read_end |
462 | && fp->_IO_write_base == fp->_IO_write_ptr); |
463 | |
464 | if (mode == 0) |
465 | dir = _IO_seek_cur, offset = 0; /* Don't move any pointers. */ |
466 | |
467 | /* Flush unwritten characters. |
468 | (This may do an unneeded write if we seek within the buffer. |
469 | But to be able to switch to reading, we would need to set |
470 | egptr to pptr. That can't be done in the current design, |
471 | which assumes file_ptr() is eGptr. Anyway, since we probably |
472 | end up flushing when we close(), it doesn't make much difference.) |
473 | FIXME: simulate mem-mapped files. */ |
474 | |
475 | if (fp->_IO_write_ptr > fp->_IO_write_base || _IO_in_put_mode (fp)) |
476 | if (_IO_switch_to_get_mode (fp)) |
477 | return EOF; |
478 | |
479 | if (fp->_IO_buf_base == NULL) |
480 | { |
481 | /* It could be that we already have a pushback buffer. */ |
482 | if (fp->_IO_read_base != NULL) |
483 | { |
484 | free (fp->_IO_read_base); |
485 | fp->_flags &= ~_IO_IN_BACKUP; |
486 | } |
487 | _IO_doallocbuf (fp); |
488 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
489 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
490 | } |
491 | |
492 | switch (dir) |
493 | { |
494 | case _IO_seek_cur: |
495 | /* Adjust for read-ahead (bytes is buffer). */ |
496 | offset -= fp->_IO_read_end - fp->_IO_read_ptr; |
497 | if (fp->_old_offset == _IO_pos_BAD) |
498 | goto dumb; |
499 | /* Make offset absolute, assuming current pointer is file_ptr(). */ |
500 | offset += fp->_old_offset; |
501 | |
502 | dir = _IO_seek_set; |
503 | break; |
504 | case _IO_seek_set: |
505 | break; |
506 | case _IO_seek_end: |
507 | { |
508 | struct stat64 st; |
509 | if (_IO_SYSSTAT (fp, &st) == 0 && S_ISREG (st.st_mode)) |
510 | { |
511 | offset += st.st_size; |
512 | dir = _IO_seek_set; |
513 | } |
514 | else |
515 | goto dumb; |
516 | } |
517 | } |
518 | /* At this point, dir==_IO_seek_set. */ |
519 | |
520 | /* If we are only interested in the current position we've found it now. */ |
521 | if (mode == 0) |
522 | return offset; |
523 | |
524 | /* If destination is within current buffer, optimize: */ |
525 | if (fp->_old_offset != _IO_pos_BAD && fp->_IO_read_base != NULL |
526 | && !_IO_in_backup (fp)) |
527 | { |
528 | /* Offset relative to start of main get area. */ |
529 | _IO_off_t rel_offset = (offset - fp->_old_offset |
530 | + (fp->_IO_read_end - fp->_IO_read_base)); |
531 | if (rel_offset >= 0) |
532 | { |
533 | #if 0 |
534 | if (_IO_in_backup (fp)) |
535 | _IO_switch_to_main_get_area (fp); |
536 | #endif |
537 | if (rel_offset <= fp->_IO_read_end - fp->_IO_read_base) |
538 | { |
539 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + rel_offset, |
540 | fp->_IO_read_end); |
541 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
542 | { |
543 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
544 | goto resync; |
545 | } |
546 | } |
547 | #ifdef TODO |
548 | /* If we have streammarkers, seek forward by reading ahead. */ |
549 | if (_IO_have_markers (fp)) |
550 | { |
551 | int to_skip = rel_offset |
552 | - (fp->_IO_read_ptr - fp->_IO_read_base); |
553 | if (ignore (to_skip) != to_skip) |
554 | goto dumb; |
555 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
556 | goto resync; |
557 | } |
558 | #endif |
559 | } |
560 | #ifdef TODO |
561 | if (rel_offset < 0 && rel_offset >= Bbase () - Bptr ()) |
562 | { |
563 | if (!_IO_in_backup (fp)) |
564 | _IO_switch_to_backup_area (fp); |
565 | gbump (fp->_IO_read_end + rel_offset - fp->_IO_read_ptr); |
566 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
567 | goto resync; |
568 | } |
569 | #endif |
570 | } |
571 | |
572 | #ifdef TODO |
573 | _IO_unsave_markers (fp); |
574 | #endif |
575 | |
576 | if (fp->_flags & _IO_NO_READS) |
577 | goto dumb; |
578 | |
579 | /* Try to seek to a block boundary, to improve kernel page management. */ |
580 | new_offset = offset & ~(fp->_IO_buf_end - fp->_IO_buf_base - 1); |
581 | delta = offset - new_offset; |
582 | if (delta > fp->_IO_buf_end - fp->_IO_buf_base) |
583 | { |
584 | new_offset = offset; |
585 | delta = 0; |
586 | } |
587 | result = _IO_SYSSEEK (fp, new_offset, 0); |
588 | if (result < 0) |
589 | return EOF; |
590 | if (delta == 0) |
591 | count = 0; |
592 | else |
593 | { |
594 | count = _IO_SYSREAD (fp, fp->_IO_buf_base, |
595 | (must_be_exact |
596 | ? delta : fp->_IO_buf_end - fp->_IO_buf_base)); |
597 | if (count < delta) |
598 | { |
599 | /* We weren't allowed to read, but try to seek the remainder. */ |
600 | offset = count == EOF ? delta : delta-count; |
601 | dir = _IO_seek_cur; |
602 | goto dumb; |
603 | } |
604 | } |
605 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + delta, |
606 | fp->_IO_buf_base + count); |
607 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
608 | fp->_old_offset = result + count; |
609 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
610 | return offset; |
611 | dumb: |
612 | |
613 | _IO_unsave_markers (fp); |
614 | result = _IO_SYSSEEK (fp, offset, dir); |
615 | if (result != EOF) |
616 | { |
617 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
618 | fp->_old_offset = result; |
619 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
620 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
621 | } |
622 | return result; |
623 | |
624 | resync: |
625 | /* We need to do it since it is possible that the file offset in |
626 | the kernel may be changed behind our back. It may happen when |
627 | we fopen a file and then do a fork. One process may access the |
628 | file and the kernel file offset will be changed. */ |
629 | if (fp->_old_offset >= 0) |
630 | _IO_SYSSEEK (fp, fp->_old_offset, 0); |
631 | |
632 | return offset; |
633 | } |
634 | |
635 | _IO_ssize_t |
636 | attribute_compat_text_section |
637 | _IO_old_file_write (_IO_FILE *f, const void *data, _IO_ssize_t n) |
638 | { |
639 | _IO_ssize_t to_do = n; |
640 | while (to_do > 0) |
641 | { |
642 | _IO_ssize_t count = write (f->_fileno, data, to_do); |
643 | if (count == EOF) |
644 | { |
645 | f->_flags |= _IO_ERR_SEEN; |
646 | break; |
647 | } |
648 | to_do -= count; |
649 | data = (void *) ((char *) data + count); |
650 | } |
651 | n -= to_do; |
652 | if (f->_old_offset >= 0) |
653 | f->_old_offset += n; |
654 | return n; |
655 | } |
656 | |
657 | _IO_size_t |
658 | attribute_compat_text_section |
659 | _IO_old_file_xsputn (_IO_FILE *f, const void *data, _IO_size_t n) |
660 | { |
661 | const char *s = (char *) data; |
662 | _IO_size_t to_do = n; |
663 | int must_flush = 0; |
664 | _IO_size_t count = 0; |
665 | |
666 | if (n <= 0) |
667 | return 0; |
668 | /* This is an optimized implementation. |
669 | If the amount to be written straddles a block boundary |
670 | (or the filebuf is unbuffered), use sys_write directly. */ |
671 | |
672 | /* First figure out how much space is available in the buffer. */ |
673 | if ((f->_flags & _IO_LINE_BUF) && (f->_flags & _IO_CURRENTLY_PUTTING)) |
674 | { |
675 | count = f->_IO_buf_end - f->_IO_write_ptr; |
676 | if (count >= n) |
677 | { |
678 | const char *p; |
679 | for (p = s + n; p > s; ) |
680 | { |
681 | if (*--p == '\n') |
682 | { |
683 | count = p - s + 1; |
684 | must_flush = 1; |
685 | break; |
686 | } |
687 | } |
688 | } |
689 | } |
690 | else if (f->_IO_write_end > f->_IO_write_ptr) |
691 | count = f->_IO_write_end - f->_IO_write_ptr; /* Space available. */ |
692 | |
693 | /* Then fill the buffer. */ |
694 | if (count > 0) |
695 | { |
696 | if (count > to_do) |
697 | count = to_do; |
698 | if (count > 20) |
699 | { |
700 | #ifdef _LIBC |
701 | f->_IO_write_ptr = __mempcpy (f->_IO_write_ptr, s, count); |
702 | #else |
703 | memcpy (f->_IO_write_ptr, s, count); |
704 | f->_IO_write_ptr += count; |
705 | #endif |
706 | s += count; |
707 | } |
708 | else |
709 | { |
710 | char *p = f->_IO_write_ptr; |
711 | int i = (int) count; |
712 | while (--i >= 0) |
713 | *p++ = *s++; |
714 | f->_IO_write_ptr = p; |
715 | } |
716 | to_do -= count; |
717 | } |
718 | if (to_do + must_flush > 0) |
719 | { |
720 | _IO_size_t block_size, do_write; |
721 | /* Next flush the (full) buffer. */ |
722 | if (__overflow (f, EOF) == EOF) |
723 | return to_do == 0 ? EOF : n - to_do; |
724 | |
725 | /* Try to maintain alignment: write a whole number of blocks. |
726 | dont_write is what gets left over. */ |
727 | block_size = f->_IO_buf_end - f->_IO_buf_base; |
728 | do_write = to_do - (block_size >= 128 ? to_do % block_size : 0); |
729 | |
730 | if (do_write) |
731 | { |
732 | count = old_do_write (f, s, do_write); |
733 | to_do -= count; |
734 | if (count < do_write) |
735 | return n - to_do; |
736 | } |
737 | |
738 | /* Now write out the remainder. Normally, this will fit in the |
739 | buffer, but it's somewhat messier for line-buffered files, |
740 | so we let _IO_default_xsputn handle the general case. */ |
741 | if (to_do) |
742 | to_do -= _IO_default_xsputn (f, s+do_write, to_do); |
743 | } |
744 | return n - to_do; |
745 | } |
746 | |
747 | |
748 | const struct _IO_jump_t _IO_old_file_jumps = |
749 | { |
750 | JUMP_INIT_DUMMY, |
751 | JUMP_INIT(finish, _IO_old_file_finish), |
752 | JUMP_INIT(overflow, _IO_old_file_overflow), |
753 | JUMP_INIT(underflow, _IO_old_file_underflow), |
754 | JUMP_INIT(uflow, _IO_default_uflow), |
755 | JUMP_INIT(pbackfail, _IO_default_pbackfail), |
756 | JUMP_INIT(xsputn, _IO_old_file_xsputn), |
757 | JUMP_INIT(xsgetn, _IO_default_xsgetn), |
758 | JUMP_INIT(seekoff, _IO_old_file_seekoff), |
759 | JUMP_INIT(seekpos, _IO_default_seekpos), |
760 | JUMP_INIT(setbuf, _IO_old_file_setbuf), |
761 | JUMP_INIT(sync, _IO_old_file_sync), |
762 | JUMP_INIT(doallocate, _IO_file_doallocate), |
763 | JUMP_INIT(read, _IO_file_read), |
764 | JUMP_INIT(write, _IO_old_file_write), |
765 | JUMP_INIT(seek, _IO_file_seek), |
766 | JUMP_INIT(close, _IO_file_close), |
767 | JUMP_INIT(stat, _IO_file_stat) |
768 | }; |
769 | |
770 | compat_symbol (libc, _IO_old_do_write, _IO_do_write, GLIBC_2_0); |
771 | compat_symbol (libc, _IO_old_file_attach, _IO_file_attach, GLIBC_2_0); |
772 | compat_symbol (libc, _IO_old_file_close_it, _IO_file_close_it, GLIBC_2_0); |
773 | compat_symbol (libc, _IO_old_file_finish, _IO_file_finish, GLIBC_2_0); |
774 | compat_symbol (libc, _IO_old_file_fopen, _IO_file_fopen, GLIBC_2_0); |
775 | compat_symbol (libc, _IO_old_file_init, _IO_file_init, GLIBC_2_0); |
776 | compat_symbol (libc, _IO_old_file_setbuf, _IO_file_setbuf, GLIBC_2_0); |
777 | compat_symbol (libc, _IO_old_file_sync, _IO_file_sync, GLIBC_2_0); |
778 | compat_symbol (libc, _IO_old_file_overflow, _IO_file_overflow, GLIBC_2_0); |
779 | compat_symbol (libc, _IO_old_file_seekoff, _IO_file_seekoff, GLIBC_2_0); |
780 | compat_symbol (libc, _IO_old_file_underflow, _IO_file_underflow, GLIBC_2_0); |
781 | compat_symbol (libc, _IO_old_file_write, _IO_file_write, GLIBC_2_0); |
782 | compat_symbol (libc, _IO_old_file_xsputn, _IO_file_xsputn, GLIBC_2_0); |
783 | |
784 | #endif |
785 | |