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6d7e8eda | 1 | /* Copyright (C) 1993-2023 Free Software Foundation, Inc. |
41bdb6e2 | 2 | This file is part of the GNU C Library. |
1ea89a40 | 3 | |
41bdb6e2 AJ |
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. | |
1ea89a40 | 8 | |
41bdb6e2 AJ |
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 | |
1ea89a40 | 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 | 12 | Lesser General Public License for more details. |
1ea89a40 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. |
1ea89a40 | 17 | |
41bdb6e2 AJ |
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. */ | |
1ea89a40 UD |
26 | |
27 | /* This is a compatibility file. If we don't build the libc with | |
28 | versioning don't compile this file. */ | |
16710d58 RM |
29 | #include <shlib-compat.h> |
30 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) | |
1ea89a40 | 31 | |
bd355af0 | 32 | #define _IO_USE_OLD_IO_FILE |
1ea89a40 UD |
33 | #include "libioP.h" |
34 | #include <fcntl.h> | |
35 | #include <sys/types.h> | |
36 | #include <sys/stat.h> | |
37 | #include <string.h> | |
38 | #include <errno.h> | |
3a90adda | 39 | #include <stdlib.h> |
2ba30a18 | 40 | #include <unistd.h> |
1ea89a40 UD |
41 | |
42 | /* An fstream can be in at most one of put mode, get mode, or putback mode. | |
43 | Putback mode is a variant of get mode. | |
44 | ||
45 | In a filebuf, there is only one current position, instead of two | |
46 | separate get and put pointers. In get mode, the current position | |
47 | is that of gptr(); in put mode that of pptr(). | |
48 | ||
49 | The position in the buffer that corresponds to the position | |
50 | in external file system is normally _IO_read_end, except in putback | |
51 | mode, when it is _IO_save_end. | |
52 | If the field _fb._offset is >= 0, it gives the offset in | |
53 | the file as a whole corresponding to eGptr(). (?) | |
54 | ||
55 | PUT MODE: | |
56 | If a filebuf is in put mode, then all of _IO_read_ptr, _IO_read_end, | |
57 | and _IO_read_base are equal to each other. These are usually equal | |
58 | to _IO_buf_base, though not necessarily if we have switched from | |
59 | get mode to put mode. (The reason is to maintain the invariant | |
60 | that _IO_read_end corresponds to the external file position.) | |
1ffb8c90 | 61 | _IO_write_base is non-NULL and usually equal to _IO_buf_base. |
1ea89a40 UD |
62 | We also have _IO_write_end == _IO_buf_end, but only in fully buffered mode. |
63 | The un-flushed character are those between _IO_write_base and _IO_write_ptr. | |
64 | ||
65 | GET MODE: | |
66 | If a filebuf is in get or putback mode, eback() != egptr(). | |
67 | In get mode, the unread characters are between gptr() and egptr(). | |
68 | The OS file position corresponds to that of egptr(). | |
69 | ||
70 | PUTBACK MODE: | |
71 | Putback mode is used to remember "excess" characters that have | |
72 | been sputbackc'd in a separate putback buffer. | |
73 | In putback mode, the get buffer points to the special putback buffer. | |
74 | The unread characters are the characters between gptr() and egptr() | |
75 | in the putback buffer, as well as the area between save_gptr() | |
76 | and save_egptr(), which point into the original reserve buffer. | |
77 | (The pointers save_gptr() and save_egptr() are the values | |
78 | of gptr() and egptr() at the time putback mode was entered.) | |
79 | The OS position corresponds to that of save_egptr(). | |
80 | ||
81 | LINE BUFFERED OUTPUT: | |
82 | During line buffered output, _IO_write_base==base() && epptr()==base(). | |
83 | However, ptr() may be anywhere between base() and ebuf(). | |
84 | This forces a call to filebuf::overflow(int C) on every put. | |
85 | If there is more space in the buffer, and C is not a '\n', | |
86 | then C is inserted, and pptr() incremented. | |
87 | ||
88 | UNBUFFERED STREAMS: | |
89 | If a filebuf is unbuffered(), the _shortbuf[1] is used as the buffer. | |
90 | */ | |
91 | ||
92 | #define CLOSED_FILEBUF_FLAGS \ | |
93 | (_IO_IS_FILEBUF+_IO_NO_READS+_IO_NO_WRITES+_IO_TIED_PUT_GET) | |
94 | ||
95 | ||
96 | void | |
4a381a81 | 97 | attribute_compat_text_section |
db3476af | 98 | _IO_old_file_init_internal (struct _IO_FILE_plus *fp) |
1ea89a40 UD |
99 | { |
100 | /* POSIX.1 allows another file handle to be used to change the position | |
101 | of our file descriptor. Hence we actually don't know the actual | |
102 | position before we do the first fseek (and until a following fflush). */ | |
2ca8b1ee | 103 | fp->file._old_offset = _IO_pos_BAD; |
df6c012b | 104 | fp->file._flags |= CLOSED_FILEBUF_FLAGS; |
1ea89a40 | 105 | |
d18ea0c5 | 106 | _IO_link_in (fp); |
2ca8b1ee GM |
107 | fp->file._vtable_offset = ((int) sizeof (struct _IO_FILE) |
108 | - (int) sizeof (struct _IO_FILE_complete)); | |
109 | fp->file._fileno = -1; | |
41c26b68 | 110 | |
a5406364 | 111 | if (&_IO_stdin_used != NULL || !_IO_legacy_file ((FILE *) fp)) |
41c26b68 UD |
112 | /* The object is dynamically allocated and large enough. Initialize |
113 | the _mode element as well. */ | |
2fe98a4a | 114 | ((struct _IO_FILE_complete *) fp)->_mode = -1; |
1ea89a40 UD |
115 | } |
116 | ||
db3476af FW |
117 | void |
118 | attribute_compat_text_section | |
119 | _IO_old_file_init (struct _IO_FILE_plus *fp) | |
120 | { | |
121 | IO_set_accept_foreign_vtables (&_IO_vtable_check); | |
122 | _IO_old_file_init_internal (fp); | |
123 | } | |
124 | ||
1ea89a40 | 125 | int |
4a381a81 | 126 | attribute_compat_text_section |
9964a145 | 127 | _IO_old_file_close_it (FILE *fp) |
1ea89a40 UD |
128 | { |
129 | int write_status, close_status; | |
130 | if (!_IO_file_is_open (fp)) | |
131 | return EOF; | |
132 | ||
6973fc01 | 133 | write_status = _IO_old_do_flush (fp); |
1ea89a40 | 134 | |
d18ea0c5 | 135 | _IO_unsave_markers (fp); |
1ea89a40 | 136 | |
94b7cc37 UD |
137 | close_status = ((fp->_flags2 & _IO_FLAGS2_NOCLOSE) == 0 |
138 | ? _IO_SYSCLOSE (fp) : 0); | |
1ea89a40 UD |
139 | |
140 | /* Free buffer. */ | |
d18ea0c5 | 141 | _IO_setb (fp, NULL, NULL, 0); |
1ea89a40 UD |
142 | _IO_setg (fp, NULL, NULL, NULL); |
143 | _IO_setp (fp, NULL, NULL); | |
144 | ||
d18ea0c5 | 145 | _IO_un_link ((struct _IO_FILE_plus *) fp); |
1ea89a40 | 146 | fp->_flags = _IO_MAGIC|CLOSED_FILEBUF_FLAGS; |
110215a9 | 147 | fp->_fileno = -1; |
1ea89a40 UD |
148 | fp->_old_offset = _IO_pos_BAD; |
149 | ||
150 | return close_status ? close_status : write_status; | |
151 | } | |
152 | ||
153 | void | |
4a381a81 | 154 | attribute_compat_text_section |
9964a145 | 155 | _IO_old_file_finish (FILE *fp, int dummy) |
1ea89a40 UD |
156 | { |
157 | if (_IO_file_is_open (fp)) | |
158 | { | |
6973fc01 | 159 | _IO_old_do_flush (fp); |
1ea89a40 UD |
160 | if (!(fp->_flags & _IO_DELETE_DONT_CLOSE)) |
161 | _IO_SYSCLOSE (fp); | |
162 | } | |
d18ea0c5 | 163 | _IO_default_finish (fp, 0); |
1ea89a40 UD |
164 | } |
165 | ||
9964a145 | 166 | FILE * |
4a381a81 | 167 | attribute_compat_text_section |
9964a145 | 168 | _IO_old_file_fopen (FILE *fp, const char *filename, const char *mode) |
1ea89a40 UD |
169 | { |
170 | int oflags = 0, omode; | |
171 | int read_write, fdesc; | |
172 | int oprot = 0666; | |
173 | if (_IO_file_is_open (fp)) | |
174 | return 0; | |
175 | switch (*mode++) | |
176 | { | |
177 | case 'r': | |
178 | omode = O_RDONLY; | |
179 | read_write = _IO_NO_WRITES; | |
180 | break; | |
181 | case 'w': | |
182 | omode = O_WRONLY; | |
183 | oflags = O_CREAT|O_TRUNC; | |
184 | read_write = _IO_NO_READS; | |
185 | break; | |
186 | case 'a': | |
187 | omode = O_WRONLY; | |
188 | oflags = O_CREAT|O_APPEND; | |
189 | read_write = _IO_NO_READS|_IO_IS_APPENDING; | |
190 | break; | |
191 | default: | |
192 | __set_errno (EINVAL); | |
193 | return NULL; | |
194 | } | |
195 | if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+')) | |
196 | { | |
197 | omode = O_RDWR; | |
198 | read_write &= _IO_IS_APPENDING; | |
199 | } | |
5f0704b6 | 200 | fdesc = __open (filename, omode|oflags, oprot); |
1ea89a40 UD |
201 | if (fdesc < 0) |
202 | return NULL; | |
203 | fp->_fileno = fdesc; | |
204 | _IO_mask_flags (fp, read_write,_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); | |
205 | if (read_write & _IO_IS_APPENDING) | |
9964a145 | 206 | if (_IO_SEEKOFF (fp, (off_t)0, _IO_seek_end, _IOS_INPUT|_IOS_OUTPUT) |
1ea89a40 UD |
207 | == _IO_pos_BAD && errno != ESPIPE) |
208 | return NULL; | |
d18ea0c5 | 209 | _IO_link_in ((struct _IO_FILE_plus *) fp); |
1ea89a40 UD |
210 | return fp; |
211 | } | |
212 | ||
9964a145 | 213 | FILE * |
4a381a81 | 214 | attribute_compat_text_section |
9964a145 | 215 | _IO_old_file_attach (FILE *fp, int fd) |
1ea89a40 UD |
216 | { |
217 | if (_IO_file_is_open (fp)) | |
218 | return NULL; | |
219 | fp->_fileno = fd; | |
220 | fp->_flags &= ~(_IO_NO_READS+_IO_NO_WRITES); | |
221 | fp->_flags |= _IO_DELETE_DONT_CLOSE; | |
222 | /* Get the current position of the file. */ | |
223 | /* We have to do that since that may be junk. */ | |
224 | fp->_old_offset = _IO_pos_BAD; | |
9964a145 | 225 | if (_IO_SEEKOFF (fp, (off_t)0, _IO_seek_cur, _IOS_INPUT|_IOS_OUTPUT) |
1ea89a40 UD |
226 | == _IO_pos_BAD && errno != ESPIPE) |
227 | return NULL; | |
228 | return fp; | |
229 | } | |
230 | ||
9964a145 | 231 | FILE * |
4a381a81 | 232 | attribute_compat_text_section |
9964a145 | 233 | _IO_old_file_setbuf (FILE *fp, char *p, ssize_t len) |
1ea89a40 UD |
234 | { |
235 | if (_IO_default_setbuf (fp, p, len) == NULL) | |
236 | return NULL; | |
237 | ||
238 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end | |
239 | = fp->_IO_buf_base; | |
240 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); | |
241 | ||
242 | return fp; | |
243 | } | |
244 | ||
9964a145 | 245 | static int old_do_write (FILE *, const char *, size_t); |
0720f75c | 246 | |
1ea89a40 UD |
247 | /* Write TO_DO bytes from DATA to FP. |
248 | Then mark FP as having empty buffers. */ | |
249 | ||
250 | int | |
4a381a81 | 251 | attribute_compat_text_section |
9964a145 | 252 | _IO_old_do_write (FILE *fp, const char *data, size_t to_do) |
0720f75c | 253 | { |
9964a145 | 254 | return (to_do == 0 || (size_t) old_do_write (fp, data, to_do) == to_do) |
0720f75c UD |
255 | ? 0 : EOF; |
256 | } | |
257 | ||
4a381a81 UD |
258 | static int |
259 | attribute_compat_text_section | |
9964a145 | 260 | old_do_write (FILE *fp, const char *data, size_t to_do) |
1ea89a40 | 261 | { |
9964a145 | 262 | size_t count; |
1ea89a40 UD |
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 | |
ded5b9b7 | 266 | not needed nor desirable for Unix- or Posix-like systems. |
1ea89a40 UD |
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 | { | |
9964a145 | 272 | off_t new_pos |
1ea89a40 UD |
273 | = _IO_SYSSEEK (fp, fp->_IO_write_base - fp->_IO_read_end, 1); |
274 | if (new_pos == _IO_pos_BAD) | |
0720f75c | 275 | return 0; |
1ea89a40 UD |
276 | fp->_old_offset = new_pos; |
277 | } | |
278 | count = _IO_SYSWRITE (fp, data, to_do); | |
0720f75c | 279 | if (fp->_cur_column && count) |
d18ea0c5 | 280 | fp->_cur_column = _IO_adjust_column (fp->_cur_column - 1, data, count) + 1; |
1ea89a40 UD |
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; | |
2e425022 | 283 | fp->_IO_write_end = ((fp->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED)) |
1ea89a40 | 284 | ? fp->_IO_buf_base : fp->_IO_buf_end); |
0720f75c | 285 | return count; |
1ea89a40 UD |
286 | } |
287 | ||
288 | int | |
4a381a81 | 289 | attribute_compat_text_section |
9964a145 | 290 | _IO_old_file_underflow (FILE *fp) |
1ea89a40 | 291 | { |
9964a145 | 292 | ssize_t count; |
2cc7bad0 ZW |
293 | |
294 | /* C99 requires EOF to be "sticky". */ | |
1ea89a40 | 295 | if (fp->_flags & _IO_EOF_SEEN) |
2cc7bad0 | 296 | return EOF; |
1ea89a40 UD |
297 | |
298 | if (fp->_flags & _IO_NO_READS) | |
299 | { | |
58034572 | 300 | fp->_flags |= _IO_ERR_SEEN; |
1ea89a40 UD |
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) | |
3a90adda AS |
308 | { |
309 | /* Maybe we already have a push back pointer. */ | |
310 | if (fp->_IO_save_base != NULL) | |
311 | { | |
312 | free (fp->_IO_save_base); | |
313 | fp->_flags &= ~_IO_IN_BACKUP; | |
314 | } | |
d18ea0c5 | 315 | _IO_doallocbuf (fp); |
3a90adda | 316 | } |
1ea89a40 UD |
317 | |
318 | /* Flush all line buffered files before reading. */ | |
319 | /* FIXME This can/should be moved to genops ?? */ | |
320 | if (fp->_flags & (_IO_LINE_BUF|_IO_UNBUFFERED)) | |
d18ea0c5 | 321 | _IO_flush_all_linebuffered (); |
1ea89a40 | 322 | |
d18ea0c5 | 323 | _IO_switch_to_get_mode (fp); |
1ea89a40 UD |
324 | |
325 | /* This is very tricky. We have to adjust those | |
326 | pointers before we call _IO_SYSREAD () since | |
327 | we may longjump () out while waiting for | |
328 | input. Those pointers may be screwed up. H.J. */ | |
329 | fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_buf_base; | |
330 | fp->_IO_read_end = fp->_IO_buf_base; | |
331 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end | |
332 | = fp->_IO_buf_base; | |
333 | ||
334 | count = _IO_SYSREAD (fp, fp->_IO_buf_base, | |
335 | fp->_IO_buf_end - fp->_IO_buf_base); | |
336 | if (count <= 0) | |
337 | { | |
338 | if (count == 0) | |
339 | fp->_flags |= _IO_EOF_SEEN; | |
340 | else | |
341 | fp->_flags |= _IO_ERR_SEEN, count = 0; | |
342 | } | |
343 | fp->_IO_read_end += count; | |
344 | if (count == 0) | |
345 | return EOF; | |
346 | if (fp->_old_offset != _IO_pos_BAD) | |
347 | _IO_pos_adjust (fp->_old_offset, count); | |
348 | return *(unsigned char *) fp->_IO_read_ptr; | |
349 | } | |
350 | ||
351 | int | |
4a381a81 | 352 | attribute_compat_text_section |
9964a145 | 353 | _IO_old_file_overflow (FILE *f, int ch) |
1ea89a40 UD |
354 | { |
355 | if (f->_flags & _IO_NO_WRITES) /* SET ERROR */ | |
356 | { | |
357 | f->_flags |= _IO_ERR_SEEN; | |
358 | __set_errno (EBADF); | |
359 | return EOF; | |
360 | } | |
361 | /* If currently reading or no buffer allocated. */ | |
362 | if ((f->_flags & _IO_CURRENTLY_PUTTING) == 0) | |
363 | { | |
364 | /* Allocate a buffer if needed. */ | |
365 | if (f->_IO_write_base == 0) | |
366 | { | |
d18ea0c5 | 367 | _IO_doallocbuf (f); |
1ea89a40 UD |
368 | _IO_setg (f, f->_IO_buf_base, f->_IO_buf_base, f->_IO_buf_base); |
369 | } | |
370 | /* Otherwise must be currently reading. | |
371 | If _IO_read_ptr (and hence also _IO_read_end) is at the buffer end, | |
372 | logically slide the buffer forwards one block (by setting the | |
373 | read pointers to all point at the beginning of the block). This | |
374 | makes room for subsequent output. | |
375 | Otherwise, set the read pointers to _IO_read_end (leaving that | |
376 | alone, so it can continue to correspond to the external position). */ | |
377 | if (f->_IO_read_ptr == f->_IO_buf_end) | |
378 | f->_IO_read_end = f->_IO_read_ptr = f->_IO_buf_base; | |
379 | f->_IO_write_ptr = f->_IO_read_ptr; | |
380 | f->_IO_write_base = f->_IO_write_ptr; | |
381 | f->_IO_write_end = f->_IO_buf_end; | |
382 | f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end; | |
383 | ||
2e425022 | 384 | if (f->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED)) |
1ea89a40 UD |
385 | f->_IO_write_end = f->_IO_write_ptr; |
386 | f->_flags |= _IO_CURRENTLY_PUTTING; | |
387 | } | |
388 | if (ch == EOF) | |
6973fc01 | 389 | return _IO_old_do_flush (f); |
1ea89a40 | 390 | if (f->_IO_write_ptr == f->_IO_buf_end ) /* Buffer is really full */ |
6973fc01 | 391 | if (_IO_old_do_flush (f) == EOF) |
1ea89a40 UD |
392 | return EOF; |
393 | *f->_IO_write_ptr++ = ch; | |
394 | if ((f->_flags & _IO_UNBUFFERED) | |
395 | || ((f->_flags & _IO_LINE_BUF) && ch == '\n')) | |
6973fc01 | 396 | if (_IO_old_do_flush (f) == EOF) |
1ea89a40 UD |
397 | return EOF; |
398 | return (unsigned char) ch; | |
399 | } | |
400 | ||
401 | int | |
4a381a81 | 402 | attribute_compat_text_section |
9964a145 | 403 | _IO_old_file_sync (FILE *fp) |
1ea89a40 | 404 | { |
9964a145 | 405 | ssize_t delta; |
1ea89a40 UD |
406 | int retval = 0; |
407 | ||
1ea89a40 UD |
408 | /* char* ptr = cur_ptr(); */ |
409 | if (fp->_IO_write_ptr > fp->_IO_write_base) | |
6973fc01 | 410 | if (_IO_old_do_flush(fp)) return EOF; |
1ea89a40 UD |
411 | delta = fp->_IO_read_ptr - fp->_IO_read_end; |
412 | if (delta != 0) | |
413 | { | |
414 | #ifdef TODO | |
415 | if (_IO_in_backup (fp)) | |
416 | delta -= eGptr () - Gbase (); | |
417 | #endif | |
9964a145 ZW |
418 | off_t new_pos = _IO_SYSSEEK (fp, delta, 1); |
419 | if (new_pos != (off_t) EOF) | |
1ea89a40 | 420 | fp->_IO_read_end = fp->_IO_read_ptr; |
1ea89a40 UD |
421 | else if (errno == ESPIPE) |
422 | ; /* Ignore error from unseekable devices. */ | |
1ea89a40 UD |
423 | else |
424 | retval = EOF; | |
425 | } | |
426 | if (retval != EOF) | |
427 | fp->_old_offset = _IO_pos_BAD; | |
428 | /* FIXME: Cleanup - can this be shared? */ | |
429 | /* setg(base(), ptr, ptr); */ | |
1ea89a40 UD |
430 | return retval; |
431 | } | |
432 | ||
9964a145 | 433 | off64_t |
4a381a81 | 434 | attribute_compat_text_section |
9964a145 | 435 | _IO_old_file_seekoff (FILE *fp, off64_t offset, int dir, int mode) |
1ea89a40 | 436 | { |
9964a145 ZW |
437 | off_t result; |
438 | off64_t delta, new_offset; | |
1ea89a40 UD |
439 | long count; |
440 | /* POSIX.1 8.2.3.7 says that after a call the fflush() the file | |
441 | offset of the underlying file must be exact. */ | |
442 | int must_be_exact = (fp->_IO_read_base == fp->_IO_read_end | |
443 | && fp->_IO_write_base == fp->_IO_write_ptr); | |
444 | ||
445 | if (mode == 0) | |
446 | dir = _IO_seek_cur, offset = 0; /* Don't move any pointers. */ | |
447 | ||
448 | /* Flush unwritten characters. | |
449 | (This may do an unneeded write if we seek within the buffer. | |
450 | But to be able to switch to reading, we would need to set | |
1ffb8c90 | 451 | egptr to pptr. That can't be done in the current design, |
1ea89a40 UD |
452 | which assumes file_ptr() is eGptr. Anyway, since we probably |
453 | end up flushing when we close(), it doesn't make much difference.) | |
1ffb8c90 | 454 | FIXME: simulate mem-mapped files. */ |
1ea89a40 UD |
455 | |
456 | if (fp->_IO_write_ptr > fp->_IO_write_base || _IO_in_put_mode (fp)) | |
d18ea0c5 | 457 | if (_IO_switch_to_get_mode (fp)) |
1ea89a40 UD |
458 | return EOF; |
459 | ||
460 | if (fp->_IO_buf_base == NULL) | |
461 | { | |
3a90adda AS |
462 | /* It could be that we already have a pushback buffer. */ |
463 | if (fp->_IO_read_base != NULL) | |
464 | { | |
465 | free (fp->_IO_read_base); | |
466 | fp->_flags &= ~_IO_IN_BACKUP; | |
467 | } | |
d18ea0c5 | 468 | _IO_doallocbuf (fp); |
1ea89a40 UD |
469 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
470 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); | |
471 | } | |
472 | ||
473 | switch (dir) | |
474 | { | |
475 | case _IO_seek_cur: | |
476 | /* Adjust for read-ahead (bytes is buffer). */ | |
477 | offset -= fp->_IO_read_end - fp->_IO_read_ptr; | |
478 | if (fp->_old_offset == _IO_pos_BAD) | |
479 | goto dumb; | |
480 | /* Make offset absolute, assuming current pointer is file_ptr(). */ | |
d64b6ad0 | 481 | offset += fp->_old_offset; |
1ea89a40 UD |
482 | |
483 | dir = _IO_seek_set; | |
484 | break; | |
485 | case _IO_seek_set: | |
486 | break; | |
487 | case _IO_seek_end: | |
488 | { | |
52a5fe70 | 489 | struct __stat64_t64 st; |
1ea89a40 UD |
490 | if (_IO_SYSSTAT (fp, &st) == 0 && S_ISREG (st.st_mode)) |
491 | { | |
492 | offset += st.st_size; | |
493 | dir = _IO_seek_set; | |
494 | } | |
495 | else | |
496 | goto dumb; | |
497 | } | |
498 | } | |
499 | /* At this point, dir==_IO_seek_set. */ | |
500 | ||
3a90adda AS |
501 | /* If we are only interested in the current position we've found it now. */ |
502 | if (mode == 0) | |
503 | return offset; | |
504 | ||
1ea89a40 UD |
505 | /* If destination is within current buffer, optimize: */ |
506 | if (fp->_old_offset != _IO_pos_BAD && fp->_IO_read_base != NULL | |
507 | && !_IO_in_backup (fp)) | |
508 | { | |
509 | /* Offset relative to start of main get area. */ | |
9964a145 ZW |
510 | off_t rel_offset = (offset - fp->_old_offset |
511 | + (fp->_IO_read_end - fp->_IO_read_base)); | |
1ea89a40 UD |
512 | if (rel_offset >= 0) |
513 | { | |
1ea89a40 UD |
514 | if (rel_offset <= fp->_IO_read_end - fp->_IO_read_base) |
515 | { | |
516 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + rel_offset, | |
517 | fp->_IO_read_end); | |
518 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); | |
3a90adda AS |
519 | { |
520 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); | |
521 | goto resync; | |
522 | } | |
1ea89a40 UD |
523 | } |
524 | #ifdef TODO | |
525 | /* If we have streammarkers, seek forward by reading ahead. */ | |
526 | if (_IO_have_markers (fp)) | |
527 | { | |
528 | int to_skip = rel_offset | |
529 | - (fp->_IO_read_ptr - fp->_IO_read_base); | |
530 | if (ignore (to_skip) != to_skip) | |
531 | goto dumb; | |
3a90adda | 532 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
4a582094 | 533 | goto resync; |
1ea89a40 UD |
534 | } |
535 | #endif | |
536 | } | |
537 | #ifdef TODO | |
538 | if (rel_offset < 0 && rel_offset >= Bbase () - Bptr ()) | |
539 | { | |
540 | if (!_IO_in_backup (fp)) | |
541 | _IO_switch_to_backup_area (fp); | |
542 | gbump (fp->_IO_read_end + rel_offset - fp->_IO_read_ptr); | |
3a90adda | 543 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
4a582094 | 544 | goto resync; |
1ea89a40 UD |
545 | } |
546 | #endif | |
547 | } | |
548 | ||
549 | #ifdef TODO | |
d18ea0c5 | 550 | _IO_unsave_markers (fp); |
1ea89a40 UD |
551 | #endif |
552 | ||
553 | if (fp->_flags & _IO_NO_READS) | |
554 | goto dumb; | |
555 | ||
556 | /* Try to seek to a block boundary, to improve kernel page management. */ | |
557 | new_offset = offset & ~(fp->_IO_buf_end - fp->_IO_buf_base - 1); | |
558 | delta = offset - new_offset; | |
559 | if (delta > fp->_IO_buf_end - fp->_IO_buf_base) | |
560 | { | |
561 | new_offset = offset; | |
562 | delta = 0; | |
563 | } | |
564 | result = _IO_SYSSEEK (fp, new_offset, 0); | |
565 | if (result < 0) | |
566 | return EOF; | |
567 | if (delta == 0) | |
568 | count = 0; | |
569 | else | |
570 | { | |
571 | count = _IO_SYSREAD (fp, fp->_IO_buf_base, | |
572 | (must_be_exact | |
573 | ? delta : fp->_IO_buf_end - fp->_IO_buf_base)); | |
574 | if (count < delta) | |
575 | { | |
576 | /* We weren't allowed to read, but try to seek the remainder. */ | |
577 | offset = count == EOF ? delta : delta-count; | |
578 | dir = _IO_seek_cur; | |
579 | goto dumb; | |
580 | } | |
581 | } | |
582 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + delta, | |
583 | fp->_IO_buf_base + count); | |
584 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); | |
585 | fp->_old_offset = result + count; | |
586 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); | |
587 | return offset; | |
588 | dumb: | |
589 | ||
d18ea0c5 | 590 | _IO_unsave_markers (fp); |
1ea89a40 UD |
591 | result = _IO_SYSSEEK (fp, offset, dir); |
592 | if (result != EOF) | |
1ddf537f UD |
593 | { |
594 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); | |
595 | fp->_old_offset = result; | |
596 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); | |
597 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); | |
598 | } | |
1ea89a40 | 599 | return result; |
4a582094 UD |
600 | |
601 | resync: | |
602 | /* We need to do it since it is possible that the file offset in | |
603 | the kernel may be changed behind our back. It may happen when | |
604 | we fopen a file and then do a fork. One process may access the | |
ded5b9b7 | 605 | file and the kernel file offset will be changed. */ |
4a582094 UD |
606 | if (fp->_old_offset >= 0) |
607 | _IO_SYSSEEK (fp, fp->_old_offset, 0); | |
608 | ||
609 | return offset; | |
1ea89a40 UD |
610 | } |
611 | ||
9964a145 | 612 | ssize_t |
4a381a81 | 613 | attribute_compat_text_section |
9964a145 | 614 | _IO_old_file_write (FILE *f, const void *data, ssize_t n) |
1ea89a40 | 615 | { |
9964a145 | 616 | ssize_t to_do = n; |
1ea89a40 UD |
617 | while (to_do > 0) |
618 | { | |
9964a145 | 619 | ssize_t count = __write (f->_fileno, data, to_do); |
1ea89a40 UD |
620 | if (count == EOF) |
621 | { | |
622 | f->_flags |= _IO_ERR_SEEN; | |
623 | break; | |
94b7cc37 | 624 | } |
1ea89a40 UD |
625 | to_do -= count; |
626 | data = (void *) ((char *) data + count); | |
627 | } | |
628 | n -= to_do; | |
629 | if (f->_old_offset >= 0) | |
630 | f->_old_offset += n; | |
631 | return n; | |
632 | } | |
633 | ||
9964a145 | 634 | size_t |
4a381a81 | 635 | attribute_compat_text_section |
9964a145 | 636 | _IO_old_file_xsputn (FILE *f, const void *data, size_t n) |
1ea89a40 | 637 | { |
2e09a79a | 638 | const char *s = (char *) data; |
9964a145 | 639 | size_t to_do = n; |
1ea89a40 | 640 | int must_flush = 0; |
9964a145 | 641 | size_t count = 0; |
1ea89a40 UD |
642 | |
643 | if (n <= 0) | |
644 | return 0; | |
645 | /* This is an optimized implementation. | |
646 | If the amount to be written straddles a block boundary | |
647 | (or the filebuf is unbuffered), use sys_write directly. */ | |
648 | ||
649 | /* First figure out how much space is available in the buffer. */ | |
1ea89a40 UD |
650 | if ((f->_flags & _IO_LINE_BUF) && (f->_flags & _IO_CURRENTLY_PUTTING)) |
651 | { | |
652 | count = f->_IO_buf_end - f->_IO_write_ptr; | |
653 | if (count >= n) | |
654 | { | |
2e09a79a | 655 | const char *p; |
1ea89a40 UD |
656 | for (p = s + n; p > s; ) |
657 | { | |
658 | if (*--p == '\n') | |
659 | { | |
660 | count = p - s + 1; | |
661 | must_flush = 1; | |
662 | break; | |
663 | } | |
664 | } | |
665 | } | |
666 | } | |
cae6ebb2 UD |
667 | else if (f->_IO_write_end > f->_IO_write_ptr) |
668 | count = f->_IO_write_end - f->_IO_write_ptr; /* Space available. */ | |
669 | ||
1ea89a40 UD |
670 | /* Then fill the buffer. */ |
671 | if (count > 0) | |
672 | { | |
673 | if (count > to_do) | |
674 | count = to_do; | |
675 | if (count > 20) | |
676 | { | |
3a90adda | 677 | f->_IO_write_ptr = __mempcpy (f->_IO_write_ptr, s, count); |
1ea89a40 UD |
678 | s += count; |
679 | } | |
680 | else | |
681 | { | |
2e09a79a JM |
682 | char *p = f->_IO_write_ptr; |
683 | int i = (int) count; | |
1ea89a40 UD |
684 | while (--i >= 0) |
685 | *p++ = *s++; | |
3a90adda | 686 | f->_IO_write_ptr = p; |
1ea89a40 | 687 | } |
1ea89a40 UD |
688 | to_do -= count; |
689 | } | |
690 | if (to_do + must_flush > 0) | |
691 | { | |
9964a145 | 692 | size_t block_size, do_write; |
1ea89a40 UD |
693 | /* Next flush the (full) buffer. */ |
694 | if (__overflow (f, EOF) == EOF) | |
5d1d7adb | 695 | return to_do == 0 ? EOF : n - to_do; |
1ea89a40 UD |
696 | |
697 | /* Try to maintain alignment: write a whole number of blocks. | |
698 | dont_write is what gets left over. */ | |
699 | block_size = f->_IO_buf_end - f->_IO_buf_base; | |
0720f75c UD |
700 | do_write = to_do - (block_size >= 128 ? to_do % block_size : 0); |
701 | ||
702 | if (do_write) | |
94b7cc37 | 703 | { |
0720f75c UD |
704 | count = old_do_write (f, s, do_write); |
705 | to_do -= count; | |
706 | if (count < do_write) | |
707 | return n - to_do; | |
94b7cc37 | 708 | } |
1ea89a40 UD |
709 | |
710 | /* Now write out the remainder. Normally, this will fit in the | |
711 | buffer, but it's somewhat messier for line-buffered files, | |
712 | so we let _IO_default_xsputn handle the general case. */ | |
0720f75c | 713 | if (to_do) |
d18ea0c5 | 714 | to_do -= _IO_default_xsputn (f, s+do_write, to_do); |
1ea89a40 UD |
715 | } |
716 | return n - to_do; | |
717 | } | |
718 | ||
16710d58 RM |
719 | compat_symbol (libc, _IO_old_do_write, _IO_do_write, GLIBC_2_0); |
720 | compat_symbol (libc, _IO_old_file_attach, _IO_file_attach, GLIBC_2_0); | |
721 | compat_symbol (libc, _IO_old_file_close_it, _IO_file_close_it, GLIBC_2_0); | |
722 | compat_symbol (libc, _IO_old_file_finish, _IO_file_finish, GLIBC_2_0); | |
723 | compat_symbol (libc, _IO_old_file_fopen, _IO_file_fopen, GLIBC_2_0); | |
724 | compat_symbol (libc, _IO_old_file_init, _IO_file_init, GLIBC_2_0); | |
725 | compat_symbol (libc, _IO_old_file_setbuf, _IO_file_setbuf, GLIBC_2_0); | |
726 | compat_symbol (libc, _IO_old_file_sync, _IO_file_sync, GLIBC_2_0); | |
727 | compat_symbol (libc, _IO_old_file_overflow, _IO_file_overflow, GLIBC_2_0); | |
728 | compat_symbol (libc, _IO_old_file_seekoff, _IO_file_seekoff, GLIBC_2_0); | |
729 | compat_symbol (libc, _IO_old_file_underflow, _IO_file_underflow, GLIBC_2_0); | |
730 | compat_symbol (libc, _IO_old_file_write, _IO_file_write, GLIBC_2_0); | |
731 | compat_symbol (libc, _IO_old_file_xsputn, _IO_file_xsputn, GLIBC_2_0); | |
732 | ||
733 | #endif |