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b168057a | 1 | /* Copyright (C) 1993-2015 Free Software Foundation, Inc. |
41bdb6e2 | 2 | This file is part of the GNU C Library. |
1ea89a40 UD |
3 | Written by Per Bothner <bothner@cygnus.com>. |
4 | ||
41bdb6e2 AJ |
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. | |
1ea89a40 | 9 | |
41bdb6e2 AJ |
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 | |
1ea89a40 | 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 | 13 | Lesser General Public License for more details. |
1ea89a40 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. | |
1ea89a40 | 18 | |
41bdb6e2 AJ |
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. */ | |
1ea89a40 UD |
27 | |
28 | /* This is a compatibility file. If we don't build the libc with | |
29 | versioning don't compile this file. */ | |
16710d58 RM |
30 | #include <shlib-compat.h> |
31 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) | |
1ea89a40 UD |
32 | |
33 | #ifndef _POSIX_SOURCE | |
34 | # define _POSIX_SOURCE | |
35 | #endif | |
bd355af0 | 36 | #define _IO_USE_OLD_IO_FILE |
1ea89a40 UD |
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> | |
3a90adda | 43 | #include <stdlib.h> |
2ba30a18 | 44 | #include <unistd.h> |
1ea89a40 UD |
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) | |
1ea89a40 UD |
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.) | |
1ffb8c90 | 80 | _IO_write_base is non-NULL and usually equal to _IO_buf_base. |
1ea89a40 UD |
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 | |
4a381a81 | 116 | attribute_compat_text_section |
9d46370c | 117 | _IO_old_file_init (struct _IO_FILE_plus *fp) |
1ea89a40 UD |
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). */ | |
2ca8b1ee GM |
122 | fp->file._old_offset = _IO_pos_BAD; |
123 | fp->file._IO_file_flags |= CLOSED_FILEBUF_FLAGS; | |
1ea89a40 | 124 | |
d18ea0c5 | 125 | _IO_link_in (fp); |
2ca8b1ee GM |
126 | fp->file._vtable_offset = ((int) sizeof (struct _IO_FILE) |
127 | - (int) sizeof (struct _IO_FILE_complete)); | |
128 | fp->file._fileno = -1; | |
41c26b68 | 129 | |
2fe98a4a UD |
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)) | |
41c26b68 UD |
135 | /* The object is dynamically allocated and large enough. Initialize |
136 | the _mode element as well. */ | |
2fe98a4a | 137 | ((struct _IO_FILE_complete *) fp)->_mode = -1; |
41c26b68 | 138 | #endif |
1ea89a40 UD |
139 | } |
140 | ||
141 | int | |
4a381a81 | 142 | attribute_compat_text_section |
9d46370c | 143 | _IO_old_file_close_it (_IO_FILE *fp) |
1ea89a40 UD |
144 | { |
145 | int write_status, close_status; | |
146 | if (!_IO_file_is_open (fp)) | |
147 | return EOF; | |
148 | ||
6973fc01 | 149 | write_status = _IO_old_do_flush (fp); |
1ea89a40 | 150 | |
d18ea0c5 | 151 | _IO_unsave_markers (fp); |
1ea89a40 | 152 | |
94b7cc37 UD |
153 | close_status = ((fp->_flags2 & _IO_FLAGS2_NOCLOSE) == 0 |
154 | ? _IO_SYSCLOSE (fp) : 0); | |
1ea89a40 UD |
155 | |
156 | /* Free buffer. */ | |
d18ea0c5 | 157 | _IO_setb (fp, NULL, NULL, 0); |
1ea89a40 UD |
158 | _IO_setg (fp, NULL, NULL, NULL); |
159 | _IO_setp (fp, NULL, NULL); | |
160 | ||
d18ea0c5 | 161 | _IO_un_link ((struct _IO_FILE_plus *) fp); |
1ea89a40 | 162 | fp->_flags = _IO_MAGIC|CLOSED_FILEBUF_FLAGS; |
110215a9 | 163 | fp->_fileno = -1; |
1ea89a40 UD |
164 | fp->_old_offset = _IO_pos_BAD; |
165 | ||
166 | return close_status ? close_status : write_status; | |
167 | } | |
168 | ||
169 | void | |
4a381a81 | 170 | attribute_compat_text_section |
9d46370c | 171 | _IO_old_file_finish (_IO_FILE *fp, int dummy) |
1ea89a40 UD |
172 | { |
173 | if (_IO_file_is_open (fp)) | |
174 | { | |
6973fc01 | 175 | _IO_old_do_flush (fp); |
1ea89a40 UD |
176 | if (!(fp->_flags & _IO_DELETE_DONT_CLOSE)) |
177 | _IO_SYSCLOSE (fp); | |
178 | } | |
d18ea0c5 | 179 | _IO_default_finish (fp, 0); |
1ea89a40 UD |
180 | } |
181 | ||
182 | _IO_FILE * | |
4a381a81 | 183 | attribute_compat_text_section |
9d46370c | 184 | _IO_old_file_fopen (_IO_FILE *fp, const char *filename, const char *mode) |
1ea89a40 UD |
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; | |
d18ea0c5 | 225 | _IO_link_in ((struct _IO_FILE_plus *) fp); |
1ea89a40 UD |
226 | return fp; |
227 | } | |
228 | ||
229 | _IO_FILE * | |
4a381a81 | 230 | attribute_compat_text_section |
9d46370c | 231 | _IO_old_file_attach (_IO_FILE *fp, int fd) |
1ea89a40 UD |
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 * | |
4a381a81 | 248 | attribute_compat_text_section |
9d46370c | 249 | _IO_old_file_setbuf (_IO_FILE *fp, char *p, _IO_ssize_t len) |
1ea89a40 UD |
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 | ||
0fca3153 | 261 | static int old_do_write (_IO_FILE *, const char *, _IO_size_t); |
0720f75c | 262 | |
1ea89a40 UD |
263 | /* Write TO_DO bytes from DATA to FP. |
264 | Then mark FP as having empty buffers. */ | |
265 | ||
266 | int | |
4a381a81 | 267 | attribute_compat_text_section |
9d46370c | 268 | _IO_old_do_write (_IO_FILE *fp, const char *data, _IO_size_t to_do) |
0720f75c | 269 | { |
57b36a0a | 270 | return (to_do == 0 || (_IO_size_t) old_do_write (fp, data, to_do) == to_do) |
0720f75c UD |
271 | ? 0 : EOF; |
272 | } | |
273 | ||
4a381a81 UD |
274 | static int |
275 | attribute_compat_text_section | |
9d46370c | 276 | old_do_write (_IO_FILE *fp, const char *data, _IO_size_t to_do) |
1ea89a40 UD |
277 | { |
278 | _IO_size_t count; | |
1ea89a40 UD |
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 | |
ded5b9b7 | 282 | not needed nor desirable for Unix- or Posix-like systems. |
1ea89a40 UD |
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 | { | |
d64b6ad0 | 288 | _IO_off_t new_pos |
1ea89a40 UD |
289 | = _IO_SYSSEEK (fp, fp->_IO_write_base - fp->_IO_read_end, 1); |
290 | if (new_pos == _IO_pos_BAD) | |
0720f75c | 291 | return 0; |
1ea89a40 UD |
292 | fp->_old_offset = new_pos; |
293 | } | |
294 | count = _IO_SYSWRITE (fp, data, to_do); | |
0720f75c | 295 | if (fp->_cur_column && count) |
d18ea0c5 | 296 | fp->_cur_column = _IO_adjust_column (fp->_cur_column - 1, data, count) + 1; |
1ea89a40 UD |
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; | |
2e425022 | 299 | fp->_IO_write_end = ((fp->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED)) |
1ea89a40 | 300 | ? fp->_IO_buf_base : fp->_IO_buf_end); |
0720f75c | 301 | return count; |
1ea89a40 UD |
302 | } |
303 | ||
304 | int | |
4a381a81 | 305 | attribute_compat_text_section |
9d46370c | 306 | _IO_old_file_underflow (_IO_FILE *fp) |
1ea89a40 UD |
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 | { | |
58034572 | 317 | fp->_flags |= _IO_ERR_SEEN; |
1ea89a40 UD |
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) | |
3a90adda AS |
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 | } | |
d18ea0c5 | 332 | _IO_doallocbuf (fp); |
3a90adda | 333 | } |
1ea89a40 UD |
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)) | |
d18ea0c5 | 338 | _IO_flush_all_linebuffered (); |
1ea89a40 | 339 | |
d18ea0c5 | 340 | _IO_switch_to_get_mode (fp); |
1ea89a40 UD |
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 | |
4a381a81 | 369 | attribute_compat_text_section |
9d46370c | 370 | _IO_old_file_overflow (_IO_FILE *f, int ch) |
1ea89a40 UD |
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 | { | |
d18ea0c5 | 384 | _IO_doallocbuf (f); |
1ea89a40 UD |
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 | ||
2e425022 | 401 | if (f->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED)) |
1ea89a40 UD |
402 | f->_IO_write_end = f->_IO_write_ptr; |
403 | f->_flags |= _IO_CURRENTLY_PUTTING; | |
404 | } | |
405 | if (ch == EOF) | |
6973fc01 | 406 | return _IO_old_do_flush (f); |
1ea89a40 | 407 | if (f->_IO_write_ptr == f->_IO_buf_end ) /* Buffer is really full */ |
6973fc01 | 408 | if (_IO_old_do_flush (f) == EOF) |
1ea89a40 UD |
409 | return EOF; |
410 | *f->_IO_write_ptr++ = ch; | |
411 | if ((f->_flags & _IO_UNBUFFERED) | |
412 | || ((f->_flags & _IO_LINE_BUF) && ch == '\n')) | |
6973fc01 | 413 | if (_IO_old_do_flush (f) == EOF) |
1ea89a40 UD |
414 | return EOF; |
415 | return (unsigned char) ch; | |
416 | } | |
417 | ||
418 | int | |
4a381a81 | 419 | attribute_compat_text_section |
9d46370c | 420 | _IO_old_file_sync (_IO_FILE *fp) |
1ea89a40 | 421 | { |
3a90adda | 422 | _IO_ssize_t delta; |
1ea89a40 UD |
423 | int retval = 0; |
424 | ||
1ea89a40 UD |
425 | /* char* ptr = cur_ptr(); */ |
426 | if (fp->_IO_write_ptr > fp->_IO_write_base) | |
6973fc01 | 427 | if (_IO_old_do_flush(fp)) return EOF; |
1ea89a40 UD |
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); */ | |
1ea89a40 UD |
449 | return retval; |
450 | } | |
451 | ||
d64b6ad0 | 452 | _IO_off64_t |
4a381a81 | 453 | attribute_compat_text_section |
9d46370c | 454 | _IO_old_file_seekoff (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode) |
1ea89a40 | 455 | { |
d64b6ad0 | 456 | _IO_off_t result; |
1ea89a40 UD |
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 | |
1ffb8c90 | 470 | egptr to pptr. That can't be done in the current design, |
1ea89a40 UD |
471 | which assumes file_ptr() is eGptr. Anyway, since we probably |
472 | end up flushing when we close(), it doesn't make much difference.) | |
1ffb8c90 | 473 | FIXME: simulate mem-mapped files. */ |
1ea89a40 UD |
474 | |
475 | if (fp->_IO_write_ptr > fp->_IO_write_base || _IO_in_put_mode (fp)) | |
d18ea0c5 | 476 | if (_IO_switch_to_get_mode (fp)) |
1ea89a40 UD |
477 | return EOF; |
478 | ||
479 | if (fp->_IO_buf_base == NULL) | |
480 | { | |
3a90adda AS |
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 | } | |
d18ea0c5 | 487 | _IO_doallocbuf (fp); |
1ea89a40 UD |
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(). */ | |
d64b6ad0 | 500 | offset += fp->_old_offset; |
1ea89a40 UD |
501 | |
502 | dir = _IO_seek_set; | |
503 | break; | |
504 | case _IO_seek_set: | |
505 | break; | |
506 | case _IO_seek_end: | |
507 | { | |
c8450f70 | 508 | struct stat64 st; |
1ea89a40 UD |
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 | ||
3a90adda AS |
520 | /* If we are only interested in the current position we've found it now. */ |
521 | if (mode == 0) | |
522 | return offset; | |
523 | ||
1ea89a40 UD |
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. */ | |
d64b6ad0 | 529 | _IO_off_t rel_offset = (offset - fp->_old_offset |
1ea89a40 UD |
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); | |
3a90adda AS |
542 | { |
543 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); | |
544 | goto resync; | |
545 | } | |
1ea89a40 UD |
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; | |
3a90adda | 555 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
4a582094 | 556 | goto resync; |
1ea89a40 UD |
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); | |
3a90adda | 566 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
4a582094 | 567 | goto resync; |
1ea89a40 UD |
568 | } |
569 | #endif | |
570 | } | |
571 | ||
572 | #ifdef TODO | |
d18ea0c5 | 573 | _IO_unsave_markers (fp); |
1ea89a40 UD |
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 | ||
d18ea0c5 | 613 | _IO_unsave_markers (fp); |
1ea89a40 UD |
614 | result = _IO_SYSSEEK (fp, offset, dir); |
615 | if (result != EOF) | |
1ddf537f UD |
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 | } | |
1ea89a40 | 622 | return result; |
4a582094 UD |
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 | |
ded5b9b7 | 628 | file and the kernel file offset will be changed. */ |
4a582094 UD |
629 | if (fp->_old_offset >= 0) |
630 | _IO_SYSSEEK (fp, fp->_old_offset, 0); | |
631 | ||
632 | return offset; | |
1ea89a40 UD |
633 | } |
634 | ||
635 | _IO_ssize_t | |
4a381a81 | 636 | attribute_compat_text_section |
9d46370c | 637 | _IO_old_file_write (_IO_FILE *f, const void *data, _IO_ssize_t n) |
1ea89a40 UD |
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; | |
94b7cc37 | 647 | } |
1ea89a40 UD |
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 | |
4a381a81 | 658 | attribute_compat_text_section |
9d46370c | 659 | _IO_old_file_xsputn (_IO_FILE *f, const void *data, _IO_size_t n) |
1ea89a40 | 660 | { |
2e09a79a | 661 | const char *s = (char *) data; |
1ea89a40 UD |
662 | _IO_size_t to_do = n; |
663 | int must_flush = 0; | |
cae6ebb2 | 664 | _IO_size_t count = 0; |
1ea89a40 UD |
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. */ | |
1ea89a40 UD |
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 | { | |
2e09a79a | 678 | const char *p; |
1ea89a40 UD |
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 | } | |
cae6ebb2 UD |
690 | else if (f->_IO_write_end > f->_IO_write_ptr) |
691 | count = f->_IO_write_end - f->_IO_write_ptr; /* Space available. */ | |
692 | ||
1ea89a40 UD |
693 | /* Then fill the buffer. */ |
694 | if (count > 0) | |
695 | { | |
696 | if (count > to_do) | |
697 | count = to_do; | |
698 | if (count > 20) | |
699 | { | |
3a90adda AS |
700 | #ifdef _LIBC |
701 | f->_IO_write_ptr = __mempcpy (f->_IO_write_ptr, s, count); | |
702 | #else | |
1ea89a40 | 703 | memcpy (f->_IO_write_ptr, s, count); |
3a90adda AS |
704 | f->_IO_write_ptr += count; |
705 | #endif | |
1ea89a40 UD |
706 | s += count; |
707 | } | |
708 | else | |
709 | { | |
2e09a79a JM |
710 | char *p = f->_IO_write_ptr; |
711 | int i = (int) count; | |
1ea89a40 UD |
712 | while (--i >= 0) |
713 | *p++ = *s++; | |
3a90adda | 714 | f->_IO_write_ptr = p; |
1ea89a40 | 715 | } |
1ea89a40 UD |
716 | to_do -= count; |
717 | } | |
718 | if (to_do + must_flush > 0) | |
719 | { | |
0720f75c | 720 | _IO_size_t block_size, do_write; |
1ea89a40 UD |
721 | /* Next flush the (full) buffer. */ |
722 | if (__overflow (f, EOF) == EOF) | |
5d1d7adb | 723 | return to_do == 0 ? EOF : n - to_do; |
1ea89a40 UD |
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; | |
0720f75c UD |
728 | do_write = to_do - (block_size >= 128 ? to_do % block_size : 0); |
729 | ||
730 | if (do_write) | |
94b7cc37 | 731 | { |
0720f75c UD |
732 | count = old_do_write (f, s, do_write); |
733 | to_do -= count; | |
734 | if (count < do_write) | |
735 | return n - to_do; | |
94b7cc37 | 736 | } |
1ea89a40 UD |
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. */ | |
0720f75c | 741 | if (to_do) |
d18ea0c5 | 742 | to_do -= _IO_default_xsputn (f, s+do_write, to_do); |
1ea89a40 UD |
743 | } |
744 | return n - to_do; | |
745 | } | |
746 | ||
747 | ||
b2637a22 | 748 | const struct _IO_jump_t _IO_old_file_jumps = |
1ea89a40 UD |
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), | |
d18ea0c5 AS |
754 | JUMP_INIT(uflow, _IO_default_uflow), |
755 | JUMP_INIT(pbackfail, _IO_default_pbackfail), | |
1ea89a40 | 756 | JUMP_INIT(xsputn, _IO_old_file_xsputn), |
d18ea0c5 | 757 | JUMP_INIT(xsgetn, _IO_default_xsgetn), |
1ea89a40 UD |
758 | JUMP_INIT(seekoff, _IO_old_file_seekoff), |
759 | JUMP_INIT(seekpos, _IO_default_seekpos), | |
760 | JUMP_INIT(setbuf, _IO_old_file_setbuf), | |
86187531 | 761 | JUMP_INIT(sync, _IO_old_file_sync), |
d18ea0c5 AS |
762 | JUMP_INIT(doallocate, _IO_file_doallocate), |
763 | JUMP_INIT(read, _IO_file_read), | |
86187531 | 764 | JUMP_INIT(write, _IO_old_file_write), |
d18ea0c5 AS |
765 | JUMP_INIT(seek, _IO_file_seek), |
766 | JUMP_INIT(close, _IO_file_close), | |
767 | JUMP_INIT(stat, _IO_file_stat) | |
1ea89a40 UD |
768 | }; |
769 | ||
16710d58 RM |
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 |