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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. |
96aa2d94 | 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. | |
96aa2d94 | 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 | |
40a55d20 | 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 | 12 | Lesser General Public License for more details. |
96aa2d94 | 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/>. |
96aa2d94 | 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. */ | |
96aa2d94 | 26 | |
96aa2d94 | 27 | |
96aa2d94 | 28 | #include "libioP.h" |
129d706d | 29 | #include <assert.h> |
96aa2d94 | 30 | #include <fcntl.h> |
8ae4bb5a | 31 | #include <sys/mman.h> |
284749da | 32 | #include <sys/param.h> |
96aa2d94 RM |
33 | #include <sys/types.h> |
34 | #include <sys/stat.h> | |
35 | #include <string.h> | |
36 | #include <errno.h> | |
c9f10034 | 37 | #include <unistd.h> |
00bc5db0 | 38 | #include <stdlib.h> |
5f0704b6 FW |
39 | #include "../wcsmbs/wcsmbsload.h" |
40 | #include "../iconv/gconv_charset.h" | |
41 | #include "../iconv/gconv_int.h" | |
42 | #include <shlib-compat.h> | |
43 | #include <not-cancel.h> | |
44 | #include <kernel-features.h> | |
68dbb3a6 | 45 | |
ab26a24a | 46 | extern struct __gconv_trans_data __libio_translit attribute_hidden; |
129d706d | 47 | |
96aa2d94 RM |
48 | /* An fstream can be in at most one of put mode, get mode, or putback mode. |
49 | Putback mode is a variant of get mode. | |
50 | ||
51 | In a filebuf, there is only one current position, instead of two | |
6d52618b | 52 | separate get and put pointers. In get mode, the current position |
96aa2d94 RM |
53 | is that of gptr(); in put mode that of pptr(). |
54 | ||
55 | The position in the buffer that corresponds to the position | |
a18f587d | 56 | in external file system is normally _IO_read_end, except in putback |
2482ae43 SP |
57 | mode, when it is _IO_save_end and also when the file is in append mode, |
58 | since switching from read to write mode automatically sends the position in | |
59 | the external file system to the end of file. | |
96aa2d94 RM |
60 | If the field _fb._offset is >= 0, it gives the offset in |
61 | the file as a whole corresponding to eGptr(). (?) | |
62 | ||
63 | PUT MODE: | |
a18f587d UD |
64 | If a filebuf is in put mode, then all of _IO_read_ptr, _IO_read_end, |
65 | and _IO_read_base are equal to each other. These are usually equal | |
66 | to _IO_buf_base, though not necessarily if we have switched from | |
67 | get mode to put mode. (The reason is to maintain the invariant | |
68 | that _IO_read_end corresponds to the external file position.) | |
1ffb8c90 | 69 | _IO_write_base is non-NULL and usually equal to _IO_buf_base. |
a18f587d UD |
70 | We also have _IO_write_end == _IO_buf_end, but only in fully buffered mode. |
71 | The un-flushed character are those between _IO_write_base and _IO_write_ptr. | |
72 | ||
96aa2d94 RM |
73 | GET MODE: |
74 | If a filebuf is in get or putback mode, eback() != egptr(). | |
75 | In get mode, the unread characters are between gptr() and egptr(). | |
76 | The OS file position corresponds to that of egptr(). | |
a18f587d | 77 | |
96aa2d94 RM |
78 | PUTBACK MODE: |
79 | Putback mode is used to remember "excess" characters that have | |
80 | been sputbackc'd in a separate putback buffer. | |
81 | In putback mode, the get buffer points to the special putback buffer. | |
82 | The unread characters are the characters between gptr() and egptr() | |
83 | in the putback buffer, as well as the area between save_gptr() | |
84 | and save_egptr(), which point into the original reserve buffer. | |
85 | (The pointers save_gptr() and save_egptr() are the values | |
86 | of gptr() and egptr() at the time putback mode was entered.) | |
87 | The OS position corresponds to that of save_egptr(). | |
23396375 | 88 | |
96aa2d94 | 89 | LINE BUFFERED OUTPUT: |
a18f587d | 90 | During line buffered output, _IO_write_base==base() && epptr()==base(). |
96aa2d94 RM |
91 | However, ptr() may be anywhere between base() and ebuf(). |
92 | This forces a call to filebuf::overflow(int C) on every put. | |
93 | If there is more space in the buffer, and C is not a '\n', | |
94 | then C is inserted, and pptr() incremented. | |
23396375 | 95 | |
96aa2d94 RM |
96 | UNBUFFERED STREAMS: |
97 | If a filebuf is unbuffered(), the _shortbuf[1] is used as the buffer. | |
98 | */ | |
99 | ||
100 | #define CLOSED_FILEBUF_FLAGS \ | |
101 | (_IO_IS_FILEBUF+_IO_NO_READS+_IO_NO_WRITES+_IO_TIED_PUT_GET) | |
102 | ||
103 | ||
104 | void | |
db3476af | 105 | _IO_new_file_init_internal (struct _IO_FILE_plus *fp) |
96aa2d94 RM |
106 | { |
107 | /* POSIX.1 allows another file handle to be used to change the position | |
108 | of our file descriptor. Hence we actually don't know the actual | |
109 | position before we do the first fseek (and until a following fflush). */ | |
2ca8b1ee | 110 | fp->file._offset = _IO_pos_BAD; |
df6c012b | 111 | fp->file._flags |= CLOSED_FILEBUF_FLAGS; |
96aa2d94 | 112 | |
d18ea0c5 | 113 | _IO_link_in (fp); |
2ca8b1ee | 114 | fp->file._fileno = -1; |
96aa2d94 | 115 | } |
db3476af FW |
116 | |
117 | /* External version of _IO_new_file_init_internal which switches off | |
118 | vtable validation. */ | |
119 | void | |
120 | _IO_new_file_init (struct _IO_FILE_plus *fp) | |
121 | { | |
122 | IO_set_accept_foreign_vtables (&_IO_vtable_check); | |
123 | _IO_new_file_init_internal (fp); | |
124 | } | |
96aa2d94 RM |
125 | |
126 | int | |
9964a145 | 127 | _IO_new_file_close_it (FILE *fp) |
96aa2d94 | 128 | { |
eb6cbd24 | 129 | int write_status; |
40a55d20 | 130 | if (!_IO_file_is_open (fp)) |
96aa2d94 RM |
131 | return EOF; |
132 | ||
eb6cbd24 MF |
133 | if ((fp->_flags & _IO_NO_WRITES) == 0 |
134 | && (fp->_flags & _IO_CURRENTLY_PUTTING) != 0) | |
3384a8d6 | 135 | write_status = _IO_do_flush (fp); |
ca408c15 UD |
136 | else |
137 | write_status = 0; | |
96aa2d94 | 138 | |
d18ea0c5 | 139 | _IO_unsave_markers (fp); |
96aa2d94 | 140 | |
94b7cc37 UD |
141 | int close_status = ((fp->_flags2 & _IO_FLAGS2_NOCLOSE) == 0 |
142 | ? _IO_SYSCLOSE (fp) : 0); | |
96aa2d94 RM |
143 | |
144 | /* Free buffer. */ | |
1e88bd0f | 145 | if (fp->_mode > 0) |
d64b6ad0 | 146 | { |
44c4ccbc | 147 | if (_IO_have_wbackup (fp)) |
d18ea0c5 AS |
148 | _IO_free_wbackup_area (fp); |
149 | _IO_wsetb (fp, NULL, NULL, 0); | |
d64b6ad0 UD |
150 | _IO_wsetg (fp, NULL, NULL, NULL); |
151 | _IO_wsetp (fp, NULL, NULL); | |
152 | } | |
d18ea0c5 | 153 | _IO_setb (fp, NULL, NULL, 0); |
1e88bd0f UD |
154 | _IO_setg (fp, NULL, NULL, NULL); |
155 | _IO_setp (fp, NULL, NULL); | |
96aa2d94 | 156 | |
d18ea0c5 | 157 | _IO_un_link ((struct _IO_FILE_plus *) fp); |
96aa2d94 | 158 | fp->_flags = _IO_MAGIC|CLOSED_FILEBUF_FLAGS; |
110215a9 | 159 | fp->_fileno = -1; |
bd355af0 | 160 | fp->_offset = _IO_pos_BAD; |
96aa2d94 | 161 | |
fa0bc87c | 162 | return close_status ? close_status : write_status; |
96aa2d94 | 163 | } |
d18ea0c5 | 164 | libc_hidden_ver (_IO_new_file_close_it, _IO_file_close_it) |
96aa2d94 RM |
165 | |
166 | void | |
9964a145 | 167 | _IO_new_file_finish (FILE *fp, int dummy) |
96aa2d94 | 168 | { |
40a55d20 | 169 | if (_IO_file_is_open (fp)) |
96aa2d94 RM |
170 | { |
171 | _IO_do_flush (fp); | |
172 | if (!(fp->_flags & _IO_DELETE_DONT_CLOSE)) | |
173 | _IO_SYSCLOSE (fp); | |
174 | } | |
d18ea0c5 | 175 | _IO_default_finish (fp, 0); |
96aa2d94 | 176 | } |
d18ea0c5 | 177 | libc_hidden_ver (_IO_new_file_finish, _IO_file_finish) |
96aa2d94 | 178 | |
9964a145 ZW |
179 | FILE * |
180 | _IO_file_open (FILE *fp, const char *filename, int posix_mode, int prot, | |
24b97882 | 181 | int read_write, int is32not64) |
bd355af0 UD |
182 | { |
183 | int fdesc; | |
a1ffb40e | 184 | if (__glibc_unlikely (fp->_flags2 & _IO_FLAGS2_NOTCANCEL)) |
c2284574 | 185 | fdesc = __open_nocancel (filename, |
ee8449f7 UD |
186 | posix_mode | (is32not64 ? 0 : O_LARGEFILE), prot); |
187 | else | |
5f0704b6 | 188 | fdesc = __open (filename, posix_mode | (is32not64 ? 0 : O_LARGEFILE), prot); |
bd355af0 UD |
189 | if (fdesc < 0) |
190 | return NULL; | |
191 | fp->_fileno = fdesc; | |
192 | _IO_mask_flags (fp, read_write,_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); | |
ea33158c SP |
193 | /* For append mode, send the file offset to the end of the file. Don't |
194 | update the offset cache though, since the file handle is not active. */ | |
195 | if ((read_write & (_IO_IS_APPENDING | _IO_NO_READS)) | |
196 | == (_IO_IS_APPENDING | _IO_NO_READS)) | |
197 | { | |
9964a145 | 198 | off64_t new_pos = _IO_SYSSEEK (fp, 0, _IO_seek_end); |
ea33158c SP |
199 | if (new_pos == _IO_pos_BAD && errno != ESPIPE) |
200 | { | |
c181840c | 201 | __close_nocancel (fdesc); |
ea33158c SP |
202 | return NULL; |
203 | } | |
204 | } | |
d18ea0c5 | 205 | _IO_link_in ((struct _IO_FILE_plus *) fp); |
bd355af0 UD |
206 | return fp; |
207 | } | |
ee2a5ae8 | 208 | libc_hidden_def (_IO_file_open) |
bd355af0 | 209 | |
9964a145 ZW |
210 | FILE * |
211 | _IO_new_file_fopen (FILE *fp, const char *filename, const char *mode, | |
24b97882 | 212 | int is32not64) |
96aa2d94 RM |
213 | { |
214 | int oflags = 0, omode; | |
bd355af0 | 215 | int read_write; |
96aa2d94 | 216 | int oprot = 0666; |
f38931a9 | 217 | int i; |
9964a145 | 218 | FILE *result; |
4e2e9999 | 219 | const char *cs; |
129d706d | 220 | const char *last_recognized; |
4e2e9999 | 221 | |
96aa2d94 RM |
222 | if (_IO_file_is_open (fp)) |
223 | return 0; | |
f38931a9 | 224 | switch (*mode) |
40a55d20 UD |
225 | { |
226 | case 'r': | |
227 | omode = O_RDONLY; | |
228 | read_write = _IO_NO_WRITES; | |
229 | break; | |
230 | case 'w': | |
231 | omode = O_WRONLY; | |
232 | oflags = O_CREAT|O_TRUNC; | |
233 | read_write = _IO_NO_READS; | |
234 | break; | |
235 | case 'a': | |
236 | omode = O_WRONLY; | |
237 | oflags = O_CREAT|O_APPEND; | |
238 | read_write = _IO_NO_READS|_IO_IS_APPENDING; | |
239 | break; | |
240 | default: | |
241 | __set_errno (EINVAL); | |
242 | return NULL; | |
243 | } | |
129d706d | 244 | last_recognized = mode; |
b722481a | 245 | for (i = 1; i < 7; ++i) |
40a55d20 | 246 | { |
f38931a9 UD |
247 | switch (*++mode) |
248 | { | |
249 | case '\0': | |
5324d258 | 250 | case ',': |
f38931a9 UD |
251 | break; |
252 | case '+': | |
253 | omode = O_RDWR; | |
254 | read_write &= _IO_IS_APPENDING; | |
129d706d | 255 | last_recognized = mode; |
f38931a9 UD |
256 | continue; |
257 | case 'x': | |
258 | oflags |= O_EXCL; | |
129d706d | 259 | last_recognized = mode; |
f38931a9 UD |
260 | continue; |
261 | case 'b': | |
129d706d | 262 | last_recognized = mode; |
b7fc6d07 UD |
263 | continue; |
264 | case 'm': | |
265 | fp->_flags2 |= _IO_FLAGS2_MMAP; | |
266 | continue; | |
ee8449f7 UD |
267 | case 'c': |
268 | fp->_flags2 |= _IO_FLAGS2_NOTCANCEL; | |
0d74e043 | 269 | continue; |
65d834b0 UD |
270 | case 'e': |
271 | oflags |= O_CLOEXEC; | |
94b7cc37 UD |
272 | fp->_flags2 |= _IO_FLAGS2_CLOEXEC; |
273 | continue; | |
f38931a9 UD |
274 | default: |
275 | /* Ignore. */ | |
276 | continue; | |
277 | } | |
278 | break; | |
40a55d20 | 279 | } |
f38931a9 | 280 | |
4e2e9999 UD |
281 | result = _IO_file_open (fp, filename, omode|oflags, oprot, read_write, |
282 | is32not64); | |
283 | ||
a101b025 | 284 | if (result != NULL) |
94b7cc37 | 285 | { |
129d706d UD |
286 | /* Test whether the mode string specifies the conversion. */ |
287 | cs = strstr (last_recognized + 1, ",ccs="); | |
288 | if (cs != NULL) | |
289 | { | |
290 | /* Yep. Load the appropriate conversions and set the orientation | |
291 | to wide. */ | |
292 | struct gconv_fcts fcts; | |
293 | struct _IO_codecvt *cc; | |
294 | char *endp = __strchrnul (cs + 5, ','); | |
6909d276 PP |
295 | char *ccs = malloc (endp - (cs + 5) + 3); |
296 | ||
297 | if (ccs == NULL) | |
298 | { | |
299 | int malloc_err = errno; /* Whatever malloc failed with. */ | |
300 | (void) _IO_file_close_it (fp); | |
301 | __set_errno (malloc_err); | |
302 | return NULL; | |
303 | } | |
129d706d UD |
304 | |
305 | *((char *) __mempcpy (ccs, cs + 5, endp - (cs + 5))) = '\0'; | |
306 | strip (ccs, ccs); | |
307 | ||
308 | if (__wcsmbs_named_conv (&fcts, ccs[2] == '\0' | |
309 | ? upstr (ccs, cs + 5) : ccs) != 0) | |
310 | { | |
311 | /* Something went wrong, we cannot load the conversion modules. | |
312 | This means we cannot proceed since the user explicitly asked | |
313 | for these. */ | |
d18ea0c5 | 314 | (void) _IO_file_close_it (fp); |
6909d276 | 315 | free (ccs); |
129d706d UD |
316 | __set_errno (EINVAL); |
317 | return NULL; | |
318 | } | |
319 | ||
6909d276 PP |
320 | free (ccs); |
321 | ||
129d706d UD |
322 | assert (fcts.towc_nsteps == 1); |
323 | assert (fcts.tomb_nsteps == 1); | |
324 | ||
325 | fp->_wide_data->_IO_read_ptr = fp->_wide_data->_IO_read_end; | |
326 | fp->_wide_data->_IO_write_ptr = fp->_wide_data->_IO_write_base; | |
327 | ||
328 | /* Clear the state. We start all over again. */ | |
329 | memset (&fp->_wide_data->_IO_state, '\0', sizeof (__mbstate_t)); | |
330 | memset (&fp->_wide_data->_IO_last_state, '\0', sizeof (__mbstate_t)); | |
331 | ||
332 | cc = fp->_codecvt = &fp->_wide_data->_codecvt; | |
333 | ||
70c6e156 FW |
334 | cc->__cd_in.step = fcts.towc; |
335 | ||
336 | cc->__cd_in.step_data.__invocation_counter = 0; | |
337 | cc->__cd_in.step_data.__internal_use = 1; | |
338 | cc->__cd_in.step_data.__flags = __GCONV_IS_LAST; | |
339 | cc->__cd_in.step_data.__statep = &result->_wide_data->_IO_state; | |
340 | ||
341 | cc->__cd_out.step = fcts.tomb; | |
342 | ||
343 | cc->__cd_out.step_data.__invocation_counter = 0; | |
344 | cc->__cd_out.step_data.__internal_use = 1; | |
345 | cc->__cd_out.step_data.__flags = __GCONV_IS_LAST | __GCONV_TRANSLIT; | |
346 | cc->__cd_out.step_data.__statep = &result->_wide_data->_IO_state; | |
129d706d | 347 | |
a815c3ab | 348 | /* From now on use the wide character callback functions. */ |
e69dcccb | 349 | _IO_JUMPS_FILE_plus (fp) = fp->_wide_data->_wide_vtable; |
a815c3ab | 350 | |
129d706d UD |
351 | /* Set the mode now. */ |
352 | result->_mode = 1; | |
129d706d | 353 | } |
4e2e9999 | 354 | } |
4e2e9999 UD |
355 | |
356 | return result; | |
96aa2d94 | 357 | } |
d18ea0c5 | 358 | libc_hidden_ver (_IO_new_file_fopen, _IO_file_fopen) |
96aa2d94 | 359 | |
9964a145 ZW |
360 | FILE * |
361 | _IO_new_file_attach (FILE *fp, int fd) | |
96aa2d94 | 362 | { |
40a55d20 | 363 | if (_IO_file_is_open (fp)) |
96aa2d94 RM |
364 | return NULL; |
365 | fp->_fileno = fd; | |
366 | fp->_flags &= ~(_IO_NO_READS+_IO_NO_WRITES); | |
367 | fp->_flags |= _IO_DELETE_DONT_CLOSE; | |
f65fd747 UD |
368 | /* Get the current position of the file. */ |
369 | /* We have to do that since that may be junk. */ | |
bd355af0 | 370 | fp->_offset = _IO_pos_BAD; |
c4a710b6 | 371 | int save_errno = errno; |
9964a145 | 372 | if (_IO_SEEKOFF (fp, (off64_t)0, _IO_seek_cur, _IOS_INPUT|_IOS_OUTPUT) |
f65fd747 UD |
373 | == _IO_pos_BAD && errno != ESPIPE) |
374 | return NULL; | |
11ed3eae | 375 | __set_errno (save_errno); |
96aa2d94 RM |
376 | return fp; |
377 | } | |
d18ea0c5 | 378 | libc_hidden_ver (_IO_new_file_attach, _IO_file_attach) |
96aa2d94 | 379 | |
9964a145 ZW |
380 | FILE * |
381 | _IO_new_file_setbuf (FILE *fp, char *p, ssize_t len) | |
96aa2d94 | 382 | { |
d64b6ad0 UD |
383 | if (_IO_default_setbuf (fp, p, len) == NULL) |
384 | return NULL; | |
96aa2d94 | 385 | |
d64b6ad0 UD |
386 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end |
387 | = fp->_IO_buf_base; | |
388 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); | |
96aa2d94 | 389 | |
d64b6ad0 | 390 | return fp; |
96aa2d94 | 391 | } |
d18ea0c5 | 392 | libc_hidden_ver (_IO_new_file_setbuf, _IO_file_setbuf) |
96aa2d94 | 393 | |
bff334e0 | 394 | |
9964a145 ZW |
395 | FILE * |
396 | _IO_file_setbuf_mmap (FILE *fp, char *p, ssize_t len) | |
bff334e0 | 397 | { |
9964a145 | 398 | FILE *result; |
bff334e0 UD |
399 | |
400 | /* Change the function table. */ | |
e69dcccb | 401 | _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps; |
bff334e0 UD |
402 | fp->_wide_data->_wide_vtable = &_IO_wfile_jumps; |
403 | ||
404 | /* And perform the normal operation. */ | |
405 | result = _IO_new_file_setbuf (fp, p, len); | |
406 | ||
407 | /* If the call failed, restore to using mmap. */ | |
408 | if (result == NULL) | |
409 | { | |
e69dcccb | 410 | _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps_mmap; |
bff334e0 UD |
411 | fp->_wide_data->_wide_vtable = &_IO_wfile_jumps_mmap; |
412 | } | |
413 | ||
414 | return result; | |
415 | } | |
416 | ||
9964a145 | 417 | static size_t new_do_write (FILE *, const char *, size_t); |
0720f75c | 418 | |
96aa2d94 | 419 | /* Write TO_DO bytes from DATA to FP. |
68dbb3a6 | 420 | Then mark FP as having empty buffers. */ |
96aa2d94 RM |
421 | |
422 | int | |
9964a145 | 423 | _IO_new_do_write (FILE *fp, const char *data, size_t to_do) |
0720f75c | 424 | { |
6dd67bd5 | 425 | return (to_do == 0 |
9964a145 | 426 | || (size_t) new_do_write (fp, data, to_do) == to_do) ? 0 : EOF; |
0720f75c | 427 | } |
d18ea0c5 | 428 | libc_hidden_ver (_IO_new_do_write, _IO_do_write) |
0720f75c | 429 | |
9964a145 ZW |
430 | static size_t |
431 | new_do_write (FILE *fp, const char *data, size_t to_do) | |
96aa2d94 | 432 | { |
9964a145 | 433 | size_t count; |
96aa2d94 RM |
434 | if (fp->_flags & _IO_IS_APPENDING) |
435 | /* On a system without a proper O_APPEND implementation, | |
436 | you would need to sys_seek(0, SEEK_END) here, but is | |
ded5b9b7 | 437 | not needed nor desirable for Unix- or Posix-like systems. |
96aa2d94 RM |
438 | Instead, just indicate that offset (before and after) is |
439 | unpredictable. */ | |
bd355af0 | 440 | fp->_offset = _IO_pos_BAD; |
96aa2d94 | 441 | else if (fp->_IO_read_end != fp->_IO_write_base) |
23396375 | 442 | { |
9964a145 | 443 | off64_t new_pos |
40a55d20 | 444 | = _IO_SYSSEEK (fp, fp->_IO_write_base - fp->_IO_read_end, 1); |
96aa2d94 | 445 | if (new_pos == _IO_pos_BAD) |
0720f75c | 446 | return 0; |
bd355af0 | 447 | fp->_offset = new_pos; |
96aa2d94 RM |
448 | } |
449 | count = _IO_SYSWRITE (fp, data, to_do); | |
0720f75c | 450 | if (fp->_cur_column && count) |
d18ea0c5 | 451 | fp->_cur_column = _IO_adjust_column (fp->_cur_column - 1, data, count) + 1; |
40a55d20 | 452 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
96aa2d94 | 453 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_buf_base; |
076bfcf6 | 454 | fp->_IO_write_end = (fp->_mode <= 0 |
2e425022 | 455 | && (fp->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED)) |
40a55d20 | 456 | ? fp->_IO_buf_base : fp->_IO_buf_end); |
0720f75c | 457 | return count; |
96aa2d94 RM |
458 | } |
459 | ||
460 | int | |
9964a145 | 461 | _IO_new_file_underflow (FILE *fp) |
96aa2d94 | 462 | { |
9964a145 | 463 | ssize_t count; |
2cc7bad0 ZW |
464 | |
465 | /* C99 requires EOF to be "sticky". */ | |
96aa2d94 | 466 | if (fp->_flags & _IO_EOF_SEEN) |
2cc7bad0 | 467 | return EOF; |
96aa2d94 RM |
468 | |
469 | if (fp->_flags & _IO_NO_READS) | |
feb3c934 | 470 | { |
58034572 | 471 | fp->_flags |= _IO_ERR_SEEN; |
feb3c934 UD |
472 | __set_errno (EBADF); |
473 | return EOF; | |
474 | } | |
96aa2d94 | 475 | if (fp->_IO_read_ptr < fp->_IO_read_end) |
40a55d20 | 476 | return *(unsigned char *) fp->_IO_read_ptr; |
96aa2d94 RM |
477 | |
478 | if (fp->_IO_buf_base == NULL) | |
00bc5db0 UD |
479 | { |
480 | /* Maybe we already have a push back pointer. */ | |
481 | if (fp->_IO_save_base != NULL) | |
482 | { | |
483 | free (fp->_IO_save_base); | |
484 | fp->_flags &= ~_IO_IN_BACKUP; | |
485 | } | |
d18ea0c5 | 486 | _IO_doallocbuf (fp); |
00bc5db0 | 487 | } |
96aa2d94 | 488 | |
96aa2d94 RM |
489 | /* FIXME This can/should be moved to genops ?? */ |
490 | if (fp->_flags & (_IO_LINE_BUF|_IO_UNBUFFERED)) | |
3d759cb8 | 491 | { |
3d759cb8 UD |
492 | /* We used to flush all line-buffered stream. This really isn't |
493 | required by any standard. My recollection is that | |
494 | traditional Unix systems did this for stdout. stderr better | |
495 | not be line buffered. So we do just that here | |
496 | explicitly. --drepper */ | |
5f10701f | 497 | _IO_acquire_lock (stdout); |
3d759cb8 | 498 | |
5f10701f | 499 | if ((stdout->_flags & (_IO_LINKED | _IO_NO_WRITES | _IO_LINE_BUF)) |
3d759cb8 | 500 | == (_IO_LINKED | _IO_LINE_BUF)) |
5f10701f | 501 | _IO_OVERFLOW (stdout, EOF); |
3d759cb8 | 502 | |
5f10701f | 503 | _IO_release_lock (stdout); |
3d759cb8 | 504 | } |
96aa2d94 | 505 | |
d18ea0c5 | 506 | _IO_switch_to_get_mode (fp); |
96aa2d94 | 507 | |
2d7da676 UD |
508 | /* This is very tricky. We have to adjust those |
509 | pointers before we call _IO_SYSREAD () since | |
510 | we may longjump () out while waiting for | |
511 | input. Those pointers may be screwed up. H.J. */ | |
512 | fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_buf_base; | |
513 | fp->_IO_read_end = fp->_IO_buf_base; | |
514 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end | |
515 | = fp->_IO_buf_base; | |
516 | ||
96aa2d94 RM |
517 | count = _IO_SYSREAD (fp, fp->_IO_buf_base, |
518 | fp->_IO_buf_end - fp->_IO_buf_base); | |
519 | if (count <= 0) | |
520 | { | |
521 | if (count == 0) | |
522 | fp->_flags |= _IO_EOF_SEEN; | |
523 | else | |
524 | fp->_flags |= _IO_ERR_SEEN, count = 0; | |
525 | } | |
2d7da676 | 526 | fp->_IO_read_end += count; |
96aa2d94 | 527 | if (count == 0) |
fe8b4d98 SP |
528 | { |
529 | /* If a stream is read to EOF, the calling application may switch active | |
530 | handles. As a result, our offset cache would no longer be valid, so | |
531 | unset it. */ | |
532 | fp->_offset = _IO_pos_BAD; | |
533 | return EOF; | |
534 | } | |
bd355af0 UD |
535 | if (fp->_offset != _IO_pos_BAD) |
536 | _IO_pos_adjust (fp->_offset, count); | |
40a55d20 | 537 | return *(unsigned char *) fp->_IO_read_ptr; |
96aa2d94 | 538 | } |
d18ea0c5 | 539 | libc_hidden_ver (_IO_new_file_underflow, _IO_file_underflow) |
96aa2d94 | 540 | |
acbee5f6 RM |
541 | /* Guts of underflow callback if we mmap the file. This stats the file and |
542 | updates the stream state to match. In the normal case we return zero. | |
543 | If the file is no longer eligible for mmap, its jump tables are reset to | |
544 | the vanilla ones and we return nonzero. */ | |
545 | static int | |
9964a145 | 546 | mmap_remap_check (FILE *fp) |
0469311e | 547 | { |
52a5fe70 | 548 | struct __stat64_t64 st; |
acbee5f6 RM |
549 | |
550 | if (_IO_SYSSTAT (fp, &st) == 0 | |
551 | && S_ISREG (st.st_mode) && st.st_size != 0 | |
552 | /* Limit the file size to 1MB for 32-bit machines. */ | |
553 | && (sizeof (ptrdiff_t) > 4 || st.st_size < 1*1024*1024)) | |
0469311e | 554 | { |
acbee5f6 RM |
555 | const size_t pagesize = __getpagesize (); |
556 | # define ROUNDED(x) (((x) + pagesize - 1) & ~(pagesize - 1)) | |
557 | if (ROUNDED (st.st_size) < ROUNDED (fp->_IO_buf_end | |
558 | - fp->_IO_buf_base)) | |
559 | { | |
560 | /* We can trim off some pages past the end of the file. */ | |
561 | (void) __munmap (fp->_IO_buf_base + ROUNDED (st.st_size), | |
562 | ROUNDED (fp->_IO_buf_end - fp->_IO_buf_base) | |
563 | - ROUNDED (st.st_size)); | |
564 | fp->_IO_buf_end = fp->_IO_buf_base + st.st_size; | |
565 | } | |
566 | else if (ROUNDED (st.st_size) > ROUNDED (fp->_IO_buf_end | |
567 | - fp->_IO_buf_base)) | |
568 | { | |
569 | /* The file added some pages. We need to remap it. */ | |
570 | void *p; | |
63fb8f9a | 571 | #if _G_HAVE_MREMAP |
acbee5f6 RM |
572 | p = __mremap (fp->_IO_buf_base, ROUNDED (fp->_IO_buf_end |
573 | - fp->_IO_buf_base), | |
574 | ROUNDED (st.st_size), MREMAP_MAYMOVE); | |
575 | if (p == MAP_FAILED) | |
576 | { | |
577 | (void) __munmap (fp->_IO_buf_base, | |
578 | fp->_IO_buf_end - fp->_IO_buf_base); | |
579 | goto punt; | |
580 | } | |
581 | #else | |
582 | (void) __munmap (fp->_IO_buf_base, | |
583 | fp->_IO_buf_end - fp->_IO_buf_base); | |
ced52c71 JM |
584 | p = __mmap64 (NULL, st.st_size, PROT_READ, MAP_SHARED, |
585 | fp->_fileno, 0); | |
acbee5f6 RM |
586 | if (p == MAP_FAILED) |
587 | goto punt; | |
588 | #endif | |
589 | fp->_IO_buf_base = p; | |
590 | fp->_IO_buf_end = fp->_IO_buf_base + st.st_size; | |
591 | } | |
592 | else | |
593 | { | |
594 | /* The number of pages didn't change. */ | |
595 | fp->_IO_buf_end = fp->_IO_buf_base + st.st_size; | |
596 | } | |
597 | # undef ROUNDED | |
598 | ||
599 | fp->_offset -= fp->_IO_read_end - fp->_IO_read_ptr; | |
fc77d66a RM |
600 | _IO_setg (fp, fp->_IO_buf_base, |
601 | fp->_offset < fp->_IO_buf_end - fp->_IO_buf_base | |
602 | ? fp->_IO_buf_base + fp->_offset : fp->_IO_buf_end, | |
acbee5f6 | 603 | fp->_IO_buf_end); |
c4292489 | 604 | |
fc77d66a RM |
605 | /* If we are already positioned at or past the end of the file, don't |
606 | change the current offset. If not, seek past what we have mapped, | |
607 | mimicking the position left by a normal underflow reading into its | |
608 | buffer until EOF. */ | |
609 | ||
610 | if (fp->_offset < fp->_IO_buf_end - fp->_IO_buf_base) | |
611 | { | |
ced52c71 JM |
612 | if (__lseek64 (fp->_fileno, fp->_IO_buf_end - fp->_IO_buf_base, |
613 | SEEK_SET) | |
fc77d66a RM |
614 | != fp->_IO_buf_end - fp->_IO_buf_base) |
615 | fp->_flags |= _IO_ERR_SEEN; | |
616 | else | |
617 | fp->_offset = fp->_IO_buf_end - fp->_IO_buf_base; | |
0469311e | 618 | } |
acbee5f6 RM |
619 | |
620 | return 0; | |
621 | } | |
622 | else | |
623 | { | |
624 | /* Life is no longer good for mmap. Punt it. */ | |
625 | (void) __munmap (fp->_IO_buf_base, | |
626 | fp->_IO_buf_end - fp->_IO_buf_base); | |
627 | punt: | |
628 | fp->_IO_buf_base = fp->_IO_buf_end = NULL; | |
629 | _IO_setg (fp, NULL, NULL, NULL); | |
630 | if (fp->_mode <= 0) | |
e69dcccb | 631 | _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps; |
acbee5f6 | 632 | else |
e69dcccb | 633 | _IO_JUMPS_FILE_plus (fp) = &_IO_wfile_jumps; |
acbee5f6 RM |
634 | fp->_wide_data->_wide_vtable = &_IO_wfile_jumps; |
635 | ||
636 | return 1; | |
0469311e | 637 | } |
acbee5f6 RM |
638 | } |
639 | ||
640 | /* Special callback replacing the underflow callbacks if we mmap the file. */ | |
641 | int | |
9964a145 | 642 | _IO_file_underflow_mmap (FILE *fp) |
acbee5f6 RM |
643 | { |
644 | if (fp->_IO_read_ptr < fp->_IO_read_end) | |
645 | return *(unsigned char *) fp->_IO_read_ptr; | |
646 | ||
a1ffb40e | 647 | if (__glibc_unlikely (mmap_remap_check (fp))) |
acbee5f6 RM |
648 | /* We punted to the regular file functions. */ |
649 | return _IO_UNDERFLOW (fp); | |
650 | ||
651 | if (fp->_IO_read_ptr < fp->_IO_read_end) | |
652 | return *(unsigned char *) fp->_IO_read_ptr; | |
0469311e UD |
653 | |
654 | fp->_flags |= _IO_EOF_SEEN; | |
655 | return EOF; | |
656 | } | |
657 | ||
acbee5f6 | 658 | static void |
9964a145 | 659 | decide_maybe_mmap (FILE *fp) |
acbee5f6 RM |
660 | { |
661 | /* We use the file in read-only mode. This could mean we can | |
662 | mmap the file and use it without any copying. But not all | |
663 | file descriptors are for mmap-able objects and on 32-bit | |
664 | machines we don't want to map files which are too large since | |
665 | this would require too much virtual memory. */ | |
52a5fe70 | 666 | struct __stat64_t64 st; |
acbee5f6 RM |
667 | |
668 | if (_IO_SYSSTAT (fp, &st) == 0 | |
669 | && S_ISREG (st.st_mode) && st.st_size != 0 | |
670 | /* Limit the file size to 1MB for 32-bit machines. */ | |
671 | && (sizeof (ptrdiff_t) > 4 || st.st_size < 1*1024*1024) | |
672 | /* Sanity check. */ | |
673 | && (fp->_offset == _IO_pos_BAD || fp->_offset <= st.st_size)) | |
674 | { | |
675 | /* Try to map the file. */ | |
676 | void *p; | |
677 | ||
ced52c71 | 678 | p = __mmap64 (NULL, st.st_size, PROT_READ, MAP_SHARED, fp->_fileno, 0); |
acbee5f6 RM |
679 | if (p != MAP_FAILED) |
680 | { | |
681 | /* OK, we managed to map the file. Set the buffer up and use a | |
682 | special jump table with simplified underflow functions which | |
683 | never tries to read anything from the file. */ | |
684 | ||
ced52c71 | 685 | if (__lseek64 (fp->_fileno, st.st_size, SEEK_SET) != st.st_size) |
acbee5f6 RM |
686 | { |
687 | (void) __munmap (p, st.st_size); | |
688 | fp->_offset = _IO_pos_BAD; | |
689 | } | |
690 | else | |
691 | { | |
d18ea0c5 | 692 | _IO_setb (fp, p, (char *) p + st.st_size, 0); |
acbee5f6 RM |
693 | |
694 | if (fp->_offset == _IO_pos_BAD) | |
695 | fp->_offset = 0; | |
696 | ||
697 | _IO_setg (fp, p, p + fp->_offset, p + st.st_size); | |
698 | fp->_offset = st.st_size; | |
699 | ||
700 | if (fp->_mode <= 0) | |
e69dcccb | 701 | _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps_mmap; |
acbee5f6 | 702 | else |
e69dcccb | 703 | _IO_JUMPS_FILE_plus (fp) = &_IO_wfile_jumps_mmap; |
acbee5f6 RM |
704 | fp->_wide_data->_wide_vtable = &_IO_wfile_jumps_mmap; |
705 | ||
706 | return; | |
707 | } | |
708 | } | |
709 | } | |
710 | ||
711 | /* We couldn't use mmap, so revert to the vanilla file operations. */ | |
712 | ||
713 | if (fp->_mode <= 0) | |
e69dcccb | 714 | _IO_JUMPS_FILE_plus (fp) = &_IO_file_jumps; |
acbee5f6 | 715 | else |
e69dcccb | 716 | _IO_JUMPS_FILE_plus (fp) = &_IO_wfile_jumps; |
acbee5f6 RM |
717 | fp->_wide_data->_wide_vtable = &_IO_wfile_jumps; |
718 | } | |
719 | ||
720 | int | |
9964a145 | 721 | _IO_file_underflow_maybe_mmap (FILE *fp) |
acbee5f6 RM |
722 | { |
723 | /* This is the first read attempt. Choose mmap or vanilla operations | |
724 | and then punt to the chosen underflow routine. */ | |
725 | decide_maybe_mmap (fp); | |
726 | return _IO_UNDERFLOW (fp); | |
727 | } | |
728 | ||
729 | ||
96aa2d94 | 730 | int |
9964a145 | 731 | _IO_new_file_overflow (FILE *f, int ch) |
96aa2d94 RM |
732 | { |
733 | if (f->_flags & _IO_NO_WRITES) /* SET ERROR */ | |
feb3c934 | 734 | { |
c131718c | 735 | f->_flags |= _IO_ERR_SEEN; |
feb3c934 UD |
736 | __set_errno (EBADF); |
737 | return EOF; | |
738 | } | |
96aa2d94 | 739 | /* If currently reading or no buffer allocated. */ |
34c5e4a1 | 740 | if ((f->_flags & _IO_CURRENTLY_PUTTING) == 0 || f->_IO_write_base == NULL) |
96aa2d94 RM |
741 | { |
742 | /* Allocate a buffer if needed. */ | |
34c5e4a1 | 743 | if (f->_IO_write_base == NULL) |
96aa2d94 | 744 | { |
d18ea0c5 | 745 | _IO_doallocbuf (f); |
96aa2d94 RM |
746 | _IO_setg (f, f->_IO_buf_base, f->_IO_buf_base, f->_IO_buf_base); |
747 | } | |
c6645251 UD |
748 | /* Otherwise must be currently reading. |
749 | If _IO_read_ptr (and hence also _IO_read_end) is at the buffer end, | |
750 | logically slide the buffer forwards one block (by setting the | |
751 | read pointers to all point at the beginning of the block). This | |
752 | makes room for subsequent output. | |
753 | Otherwise, set the read pointers to _IO_read_end (leaving that | |
754 | alone, so it can continue to correspond to the external position). */ | |
a1ffb40e | 755 | if (__glibc_unlikely (_IO_in_backup (f))) |
483b8cc6 UD |
756 | { |
757 | size_t nbackup = f->_IO_read_end - f->_IO_read_ptr; | |
d18ea0c5 | 758 | _IO_free_backup_area (f); |
483b8cc6 UD |
759 | f->_IO_read_base -= MIN (nbackup, |
760 | f->_IO_read_base - f->_IO_buf_base); | |
761 | f->_IO_read_ptr = f->_IO_read_base; | |
762 | } | |
eb35b097 UD |
763 | |
764 | if (f->_IO_read_ptr == f->_IO_buf_end) | |
765 | f->_IO_read_end = f->_IO_read_ptr = f->_IO_buf_base; | |
766 | f->_IO_write_ptr = f->_IO_read_ptr; | |
767 | f->_IO_write_base = f->_IO_write_ptr; | |
768 | f->_IO_write_end = f->_IO_buf_end; | |
769 | f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end; | |
96aa2d94 | 770 | |
96aa2d94 | 771 | f->_flags |= _IO_CURRENTLY_PUTTING; |
2e425022 | 772 | if (f->_mode <= 0 && f->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED)) |
bfcd44c3 | 773 | f->_IO_write_end = f->_IO_write_ptr; |
96aa2d94 RM |
774 | } |
775 | if (ch == EOF) | |
d18ea0c5 AS |
776 | return _IO_do_write (f, f->_IO_write_base, |
777 | f->_IO_write_ptr - f->_IO_write_base); | |
96aa2d94 | 778 | if (f->_IO_write_ptr == f->_IO_buf_end ) /* Buffer is really full */ |
40a55d20 | 779 | if (_IO_do_flush (f) == EOF) |
96aa2d94 RM |
780 | return EOF; |
781 | *f->_IO_write_ptr++ = ch; | |
782 | if ((f->_flags & _IO_UNBUFFERED) | |
783 | || ((f->_flags & _IO_LINE_BUF) && ch == '\n')) | |
d18ea0c5 AS |
784 | if (_IO_do_write (f, f->_IO_write_base, |
785 | f->_IO_write_ptr - f->_IO_write_base) == EOF) | |
96aa2d94 | 786 | return EOF; |
40a55d20 | 787 | return (unsigned char) ch; |
96aa2d94 | 788 | } |
d18ea0c5 | 789 | libc_hidden_ver (_IO_new_file_overflow, _IO_file_overflow) |
96aa2d94 RM |
790 | |
791 | int | |
9964a145 | 792 | _IO_new_file_sync (FILE *fp) |
96aa2d94 | 793 | { |
9964a145 | 794 | ssize_t delta; |
61eb22d3 UD |
795 | int retval = 0; |
796 | ||
96aa2d94 RM |
797 | /* char* ptr = cur_ptr(); */ |
798 | if (fp->_IO_write_ptr > fp->_IO_write_base) | |
799 | if (_IO_do_flush(fp)) return EOF; | |
23396375 | 800 | delta = fp->_IO_read_ptr - fp->_IO_read_end; |
96aa2d94 RM |
801 | if (delta != 0) |
802 | { | |
9964a145 ZW |
803 | off64_t new_pos = _IO_SYSSEEK (fp, delta, 1); |
804 | if (new_pos != (off64_t) EOF) | |
96aa2d94 | 805 | fp->_IO_read_end = fp->_IO_read_ptr; |
96aa2d94 RM |
806 | else if (errno == ESPIPE) |
807 | ; /* Ignore error from unseekable devices. */ | |
96aa2d94 | 808 | else |
61eb22d3 | 809 | retval = EOF; |
96aa2d94 | 810 | } |
61eb22d3 | 811 | if (retval != EOF) |
bd355af0 | 812 | fp->_offset = _IO_pos_BAD; |
96aa2d94 RM |
813 | /* FIXME: Cleanup - can this be shared? */ |
814 | /* setg(base(), ptr, ptr); */ | |
61eb22d3 | 815 | return retval; |
96aa2d94 | 816 | } |
d18ea0c5 | 817 | libc_hidden_ver (_IO_new_file_sync, _IO_file_sync) |
96aa2d94 | 818 | |
3020f726 | 819 | int |
9964a145 | 820 | _IO_file_sync_mmap (FILE *fp) |
acbee5f6 RM |
821 | { |
822 | if (fp->_IO_read_ptr != fp->_IO_read_end) | |
823 | { | |
ced52c71 JM |
824 | if (__lseek64 (fp->_fileno, fp->_IO_read_ptr - fp->_IO_buf_base, |
825 | SEEK_SET) | |
acbee5f6 RM |
826 | != fp->_IO_read_ptr - fp->_IO_buf_base) |
827 | { | |
828 | fp->_flags |= _IO_ERR_SEEN; | |
829 | return EOF; | |
830 | } | |
831 | } | |
832 | fp->_offset = fp->_IO_read_ptr - fp->_IO_buf_base; | |
833 | fp->_IO_read_end = fp->_IO_read_ptr = fp->_IO_read_base; | |
834 | return 0; | |
835 | } | |
836 | ||
ea33158c SP |
837 | /* ftell{,o} implementation. The only time we modify the state of the stream |
838 | is when we have unflushed writes. In that case we seek to the end and | |
839 | record that offset in the stream object. */ | |
9964a145 ZW |
840 | static off64_t |
841 | do_ftell (FILE *fp) | |
000232b9 | 842 | { |
9964a145 | 843 | off64_t result, offset = 0; |
000232b9 SP |
844 | |
845 | /* No point looking at unflushed data if we haven't allocated buffers | |
846 | yet. */ | |
847 | if (fp->_IO_buf_base != NULL) | |
848 | { | |
be349d70 | 849 | bool unflushed_writes = fp->_IO_write_ptr > fp->_IO_write_base; |
000232b9 | 850 | |
ea33158c SP |
851 | bool append_mode = (fp->_flags & _IO_IS_APPENDING) == _IO_IS_APPENDING; |
852 | ||
853 | /* When we have unflushed writes in append mode, seek to the end of the | |
854 | file and record that offset. This is the only time we change the file | |
855 | stream state and it is safe since the file handle is active. */ | |
be349d70 | 856 | if (unflushed_writes && append_mode) |
ea33158c SP |
857 | { |
858 | result = _IO_SYSSEEK (fp, 0, _IO_seek_end); | |
859 | if (result == _IO_pos_BAD) | |
860 | return EOF; | |
861 | else | |
862 | fp->_offset = result; | |
863 | } | |
864 | ||
000232b9 | 865 | /* Adjust for unflushed data. */ |
be349d70 | 866 | if (!unflushed_writes) |
ea33158c | 867 | offset -= fp->_IO_read_end - fp->_IO_read_ptr; |
2482ae43 SP |
868 | /* We don't trust _IO_read_end to represent the current file offset when |
869 | writing in append mode because the value would have to be shifted to | |
870 | the end of the file during a flush. Use the write base instead, along | |
871 | with the new offset we got above when we did a seek to the end of the | |
872 | file. */ | |
873 | else if (append_mode) | |
874 | offset += fp->_IO_write_ptr - fp->_IO_write_base; | |
875 | /* For all other modes, _IO_read_end represents the file offset. */ | |
000232b9 | 876 | else |
ea33158c | 877 | offset += fp->_IO_write_ptr - fp->_IO_read_end; |
000232b9 SP |
878 | } |
879 | ||
ea33158c SP |
880 | if (fp->_offset != _IO_pos_BAD) |
881 | result = fp->_offset; | |
fa3cd248 | 882 | else |
ea33158c | 883 | result = _IO_SYSSEEK (fp, 0, _IO_seek_cur); |
fa3cd248 SP |
884 | |
885 | if (result == EOF) | |
886 | return result; | |
887 | ||
ea33158c SP |
888 | result += offset; |
889 | ||
000232b9 SP |
890 | if (result < 0) |
891 | { | |
892 | __set_errno (EINVAL); | |
893 | return EOF; | |
894 | } | |
895 | ||
896 | return result; | |
897 | } | |
898 | ||
9964a145 ZW |
899 | off64_t |
900 | _IO_new_file_seekoff (FILE *fp, off64_t offset, int dir, int mode) | |
96aa2d94 | 901 | { |
9964a145 ZW |
902 | off64_t result; |
903 | off64_t delta, new_offset; | |
96aa2d94 | 904 | long count; |
000232b9 SP |
905 | |
906 | /* Short-circuit into a separate function. We don't want to mix any | |
907 | functionality and we don't want to touch anything inside the FILE | |
908 | object. */ | |
909 | if (mode == 0) | |
910 | return do_ftell (fp); | |
911 | ||
feb3c934 UD |
912 | /* POSIX.1 8.2.3.7 says that after a call the fflush() the file |
913 | offset of the underlying file must be exact. */ | |
914 | int must_be_exact = (fp->_IO_read_base == fp->_IO_read_end | |
915 | && fp->_IO_write_base == fp->_IO_write_ptr); | |
96aa2d94 | 916 | |
adb26fae SP |
917 | bool was_writing = (fp->_IO_write_ptr > fp->_IO_write_base |
918 | || _IO_in_put_mode (fp)); | |
919 | ||
96aa2d94 RM |
920 | /* Flush unwritten characters. |
921 | (This may do an unneeded write if we seek within the buffer. | |
922 | But to be able to switch to reading, we would need to set | |
2b4f00d1 | 923 | egptr to pptr. That can't be done in the current design, |
96aa2d94 RM |
924 | which assumes file_ptr() is eGptr. Anyway, since we probably |
925 | end up flushing when we close(), it doesn't make much difference.) | |
2b4f00d1 | 926 | FIXME: simulate mem-mapped files. */ |
000232b9 | 927 | if (was_writing && _IO_switch_to_get_mode (fp)) |
adb26fae | 928 | return EOF; |
96aa2d94 RM |
929 | |
930 | if (fp->_IO_buf_base == NULL) | |
931 | { | |
00bc5db0 UD |
932 | /* It could be that we already have a pushback buffer. */ |
933 | if (fp->_IO_read_base != NULL) | |
934 | { | |
935 | free (fp->_IO_read_base); | |
936 | fp->_flags &= ~_IO_IN_BACKUP; | |
937 | } | |
d18ea0c5 | 938 | _IO_doallocbuf (fp); |
40a55d20 UD |
939 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
940 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); | |
96aa2d94 RM |
941 | } |
942 | ||
943 | switch (dir) | |
944 | { | |
945 | case _IO_seek_cur: | |
946 | /* Adjust for read-ahead (bytes is buffer). */ | |
000232b9 | 947 | offset -= fp->_IO_read_end - fp->_IO_read_ptr; |
adb26fae | 948 | |
bd355af0 | 949 | if (fp->_offset == _IO_pos_BAD) |
000232b9 | 950 | goto dumb; |
96aa2d94 | 951 | /* Make offset absolute, assuming current pointer is file_ptr(). */ |
d64b6ad0 | 952 | offset += fp->_offset; |
405550bf UD |
953 | if (offset < 0) |
954 | { | |
955 | __set_errno (EINVAL); | |
956 | return EOF; | |
957 | } | |
96aa2d94 RM |
958 | |
959 | dir = _IO_seek_set; | |
960 | break; | |
961 | case _IO_seek_set: | |
962 | break; | |
963 | case _IO_seek_end: | |
964 | { | |
52a5fe70 | 965 | struct __stat64_t64 st; |
40a55d20 | 966 | if (_IO_SYSSTAT (fp, &st) == 0 && S_ISREG (st.st_mode)) |
96aa2d94 RM |
967 | { |
968 | offset += st.st_size; | |
969 | dir = _IO_seek_set; | |
970 | } | |
971 | else | |
972 | goto dumb; | |
973 | } | |
974 | } | |
cc683f7e AZ |
975 | |
976 | _IO_free_backup_area (fp); | |
977 | ||
96aa2d94 RM |
978 | /* At this point, dir==_IO_seek_set. */ |
979 | ||
980 | /* If destination is within current buffer, optimize: */ | |
bd355af0 | 981 | if (fp->_offset != _IO_pos_BAD && fp->_IO_read_base != NULL |
96aa2d94 RM |
982 | && !_IO_in_backup (fp)) |
983 | { | |
9964a145 ZW |
984 | off64_t start_offset = (fp->_offset |
985 | - (fp->_IO_read_end - fp->_IO_buf_base)); | |
c03c66dd | 986 | if (offset >= start_offset && offset < fp->_offset) |
96aa2d94 | 987 | { |
c03c66dd UD |
988 | _IO_setg (fp, fp->_IO_buf_base, |
989 | fp->_IO_buf_base + (offset - start_offset), | |
990 | fp->_IO_read_end); | |
991 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); | |
992 | ||
00bc5db0 | 993 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
4a582094 | 994 | goto resync; |
96aa2d94 | 995 | } |
96aa2d94 RM |
996 | } |
997 | ||
96aa2d94 RM |
998 | if (fp->_flags & _IO_NO_READS) |
999 | goto dumb; | |
1000 | ||
1001 | /* Try to seek to a block boundary, to improve kernel page management. */ | |
1002 | new_offset = offset & ~(fp->_IO_buf_end - fp->_IO_buf_base - 1); | |
1003 | delta = offset - new_offset; | |
1004 | if (delta > fp->_IO_buf_end - fp->_IO_buf_base) | |
1005 | { | |
1006 | new_offset = offset; | |
1007 | delta = 0; | |
1008 | } | |
1009 | result = _IO_SYSSEEK (fp, new_offset, 0); | |
1010 | if (result < 0) | |
1011 | return EOF; | |
1012 | if (delta == 0) | |
1013 | count = 0; | |
1014 | else | |
1015 | { | |
1016 | count = _IO_SYSREAD (fp, fp->_IO_buf_base, | |
feb3c934 UD |
1017 | (must_be_exact |
1018 | ? delta : fp->_IO_buf_end - fp->_IO_buf_base)); | |
96aa2d94 RM |
1019 | if (count < delta) |
1020 | { | |
1021 | /* We weren't allowed to read, but try to seek the remainder. */ | |
1022 | offset = count == EOF ? delta : delta-count; | |
1023 | dir = _IO_seek_cur; | |
1024 | goto dumb; | |
1025 | } | |
1026 | } | |
40a55d20 UD |
1027 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + delta, |
1028 | fp->_IO_buf_base + count); | |
1029 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); | |
bd355af0 | 1030 | fp->_offset = result + count; |
40a55d20 | 1031 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
96aa2d94 RM |
1032 | return offset; |
1033 | dumb: | |
1034 | ||
d18ea0c5 | 1035 | _IO_unsave_markers (fp); |
96aa2d94 RM |
1036 | result = _IO_SYSSEEK (fp, offset, dir); |
1037 | if (result != EOF) | |
d762684b UD |
1038 | { |
1039 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); | |
1040 | fp->_offset = result; | |
1041 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); | |
1042 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); | |
1043 | } | |
96aa2d94 | 1044 | return result; |
4a582094 UD |
1045 | |
1046 | resync: | |
1047 | /* We need to do it since it is possible that the file offset in | |
1048 | the kernel may be changed behind our back. It may happen when | |
1049 | we fopen a file and then do a fork. One process may access the | |
ded5b9b7 | 1050 | file and the kernel file offset will be changed. */ |
4a582094 UD |
1051 | if (fp->_offset >= 0) |
1052 | _IO_SYSSEEK (fp, fp->_offset, 0); | |
1053 | ||
1054 | return offset; | |
96aa2d94 | 1055 | } |
d18ea0c5 | 1056 | libc_hidden_ver (_IO_new_file_seekoff, _IO_file_seekoff) |
96aa2d94 | 1057 | |
9964a145 ZW |
1058 | off64_t |
1059 | _IO_file_seekoff_mmap (FILE *fp, off64_t offset, int dir, int mode) | |
284749da | 1060 | { |
9964a145 | 1061 | off64_t result; |
284749da | 1062 | |
7e93f915 RM |
1063 | /* If we are only interested in the current position, calculate it and |
1064 | return right now. This calculation does the right thing when we are | |
1065 | using a pushback buffer, but in the usual case has the same value as | |
1066 | (fp->_IO_read_ptr - fp->_IO_buf_base). */ | |
284749da | 1067 | if (mode == 0) |
78ce5a3b | 1068 | return fp->_offset - (fp->_IO_read_end - fp->_IO_read_ptr); |
284749da UD |
1069 | |
1070 | switch (dir) | |
1071 | { | |
1072 | case _IO_seek_cur: | |
1073 | /* Adjust for read-ahead (bytes is buffer). */ | |
1074 | offset += fp->_IO_read_ptr - fp->_IO_read_base; | |
1075 | break; | |
1076 | case _IO_seek_set: | |
1077 | break; | |
1078 | case _IO_seek_end: | |
903b3396 | 1079 | offset += fp->_IO_buf_end - fp->_IO_buf_base; |
284749da UD |
1080 | break; |
1081 | } | |
1082 | /* At this point, dir==_IO_seek_set. */ | |
1083 | ||
1084 | if (offset < 0) | |
66bff409 UD |
1085 | { |
1086 | /* No negative offsets are valid. */ | |
1087 | __set_errno (EINVAL); | |
1088 | return EOF; | |
1089 | } | |
284749da | 1090 | |
284749da UD |
1091 | result = _IO_SYSSEEK (fp, offset, 0); |
1092 | if (result < 0) | |
1093 | return EOF; | |
1094 | ||
fc77d66a RM |
1095 | if (offset > fp->_IO_buf_end - fp->_IO_buf_base) |
1096 | /* One can fseek arbitrarily past the end of the file | |
1097 | and it is meaningless until one attempts to read. | |
1098 | Leave the buffer pointers in EOF state until underflow. */ | |
1099 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_end, fp->_IO_buf_end); | |
1100 | else | |
1101 | /* Adjust the read pointers to match the file position, | |
1102 | but so the next read attempt will call underflow. */ | |
1103 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + offset, | |
1104 | fp->_IO_buf_base + offset); | |
1105 | ||
66bff409 | 1106 | fp->_offset = result; |
284749da UD |
1107 | |
1108 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); | |
1109 | ||
1110 | return offset; | |
1111 | } | |
1112 | ||
3020f726 | 1113 | off64_t |
9964a145 | 1114 | _IO_file_seekoff_maybe_mmap (FILE *fp, off64_t offset, int dir, |
f5bf21a7 | 1115 | int mode) |
acbee5f6 RM |
1116 | { |
1117 | /* We only get here when we haven't tried to read anything yet. | |
1118 | So there is nothing more useful for us to do here than just | |
1119 | the underlying lseek call. */ | |
1120 | ||
9964a145 | 1121 | off64_t result = _IO_SYSSEEK (fp, offset, dir); |
acbee5f6 RM |
1122 | if (result < 0) |
1123 | return EOF; | |
1124 | ||
1125 | fp->_offset = result; | |
1126 | return result; | |
1127 | } | |
1128 | ||
9964a145 ZW |
1129 | ssize_t |
1130 | _IO_file_read (FILE *fp, void *buf, ssize_t size) | |
96aa2d94 | 1131 | { |
e3c54d80 | 1132 | return (__builtin_expect (fp->_flags2 & _IO_FLAGS2_NOTCANCEL, 0) |
a748eb31 | 1133 | ? __read_nocancel (fp->_fileno, buf, size) |
5f0704b6 | 1134 | : __read (fp->_fileno, buf, size)); |
96aa2d94 | 1135 | } |
d18ea0c5 | 1136 | libc_hidden_def (_IO_file_read) |
96aa2d94 | 1137 | |
9964a145 ZW |
1138 | off64_t |
1139 | _IO_file_seek (FILE *fp, off64_t offset, int dir) | |
96aa2d94 | 1140 | { |
ced52c71 | 1141 | return __lseek64 (fp->_fileno, offset, dir); |
96aa2d94 | 1142 | } |
d18ea0c5 | 1143 | libc_hidden_def (_IO_file_seek) |
96aa2d94 RM |
1144 | |
1145 | int | |
9964a145 | 1146 | _IO_file_stat (FILE *fp, void *st) |
96aa2d94 | 1147 | { |
52a5fe70 | 1148 | return __fstat64_time64 (fp->_fileno, (struct __stat64_t64 *) st); |
96aa2d94 | 1149 | } |
d18ea0c5 | 1150 | libc_hidden_def (_IO_file_stat) |
96aa2d94 | 1151 | |
0469311e | 1152 | int |
9964a145 | 1153 | _IO_file_close_mmap (FILE *fp) |
0469311e | 1154 | { |
acbee5f6 RM |
1155 | /* In addition to closing the file descriptor we have to unmap the file. */ |
1156 | (void) __munmap (fp->_IO_buf_base, fp->_IO_buf_end - fp->_IO_buf_base); | |
0469311e | 1157 | fp->_IO_buf_base = fp->_IO_buf_end = NULL; |
73299943 UD |
1158 | /* Cancelling close should be avoided if possible since it leaves an |
1159 | unrecoverable state behind. */ | |
c181840c | 1160 | return __close_nocancel (fp->_fileno); |
0469311e UD |
1161 | } |
1162 | ||
96aa2d94 | 1163 | int |
9964a145 | 1164 | _IO_file_close (FILE *fp) |
96aa2d94 | 1165 | { |
73299943 UD |
1166 | /* Cancelling close should be avoided if possible since it leaves an |
1167 | unrecoverable state behind. */ | |
c181840c | 1168 | return __close_nocancel (fp->_fileno); |
96aa2d94 | 1169 | } |
d18ea0c5 | 1170 | libc_hidden_def (_IO_file_close) |
96aa2d94 | 1171 | |
9964a145 ZW |
1172 | ssize_t |
1173 | _IO_new_file_write (FILE *f, const void *data, ssize_t n) | |
96aa2d94 | 1174 | { |
9964a145 | 1175 | ssize_t to_do = n; |
96aa2d94 RM |
1176 | while (to_do > 0) |
1177 | { | |
9964a145 ZW |
1178 | ssize_t count = (__builtin_expect (f->_flags2 |
1179 | & _IO_FLAGS2_NOTCANCEL, 0) | |
c647fb88 | 1180 | ? __write_nocancel (f->_fileno, data, to_do) |
5f0704b6 | 1181 | : __write (f->_fileno, data, to_do)); |
d64b6ad0 | 1182 | if (count < 0) |
96aa2d94 | 1183 | { |
39e16978 UD |
1184 | f->_flags |= _IO_ERR_SEEN; |
1185 | break; | |
b722481a | 1186 | } |
96aa2d94 | 1187 | to_do -= count; |
40a55d20 | 1188 | data = (void *) ((char *) data + count); |
96aa2d94 RM |
1189 | } |
1190 | n -= to_do; | |
bd355af0 UD |
1191 | if (f->_offset >= 0) |
1192 | f->_offset += n; | |
3d110c7c | 1193 | return n; |
96aa2d94 RM |
1194 | } |
1195 | ||
9964a145 ZW |
1196 | size_t |
1197 | _IO_new_file_xsputn (FILE *f, const void *data, size_t n) | |
96aa2d94 | 1198 | { |
2e09a79a | 1199 | const char *s = (const char *) data; |
9964a145 | 1200 | size_t to_do = n; |
96aa2d94 | 1201 | int must_flush = 0; |
9964a145 | 1202 | size_t count = 0; |
96aa2d94 RM |
1203 | |
1204 | if (n <= 0) | |
1205 | return 0; | |
1206 | /* This is an optimized implementation. | |
1207 | If the amount to be written straddles a block boundary | |
1208 | (or the filebuf is unbuffered), use sys_write directly. */ | |
1209 | ||
1210 | /* First figure out how much space is available in the buffer. */ | |
96aa2d94 RM |
1211 | if ((f->_flags & _IO_LINE_BUF) && (f->_flags & _IO_CURRENTLY_PUTTING)) |
1212 | { | |
1213 | count = f->_IO_buf_end - f->_IO_write_ptr; | |
1214 | if (count >= n) | |
40a55d20 | 1215 | { |
2e09a79a | 1216 | const char *p; |
96aa2d94 RM |
1217 | for (p = s + n; p > s; ) |
1218 | { | |
40a55d20 UD |
1219 | if (*--p == '\n') |
1220 | { | |
1221 | count = p - s + 1; | |
1222 | must_flush = 1; | |
1223 | break; | |
1224 | } | |
96aa2d94 RM |
1225 | } |
1226 | } | |
1227 | } | |
cae6ebb2 UD |
1228 | else if (f->_IO_write_end > f->_IO_write_ptr) |
1229 | count = f->_IO_write_end - f->_IO_write_ptr; /* Space available. */ | |
1230 | ||
96aa2d94 RM |
1231 | /* Then fill the buffer. */ |
1232 | if (count > 0) | |
1233 | { | |
1234 | if (count > to_do) | |
1235 | count = to_do; | |
20fde227 | 1236 | f->_IO_write_ptr = __mempcpy (f->_IO_write_ptr, s, count); |
20fde227 | 1237 | s += count; |
96aa2d94 RM |
1238 | to_do -= count; |
1239 | } | |
1240 | if (to_do + must_flush > 0) | |
40a55d20 | 1241 | { |
9964a145 | 1242 | size_t block_size, do_write; |
96aa2d94 | 1243 | /* Next flush the (full) buffer. */ |
5c8d1fc0 | 1244 | if (_IO_OVERFLOW (f, EOF) == EOF) |
3d110c7c EB |
1245 | /* If nothing else has to be written we must not signal the |
1246 | caller that everything has been written. */ | |
1247 | return to_do == 0 ? EOF : n - to_do; | |
96aa2d94 | 1248 | |
3d110c7c | 1249 | /* Try to maintain alignment: write a whole number of blocks. */ |
96aa2d94 | 1250 | block_size = f->_IO_buf_end - f->_IO_buf_base; |
0720f75c UD |
1251 | do_write = to_do - (block_size >= 128 ? to_do % block_size : 0); |
1252 | ||
1253 | if (do_write) | |
b722481a | 1254 | { |
0720f75c UD |
1255 | count = new_do_write (f, s, do_write); |
1256 | to_do -= count; | |
1257 | if (count < do_write) | |
1258 | return n - to_do; | |
b722481a | 1259 | } |
23396375 | 1260 | |
96aa2d94 RM |
1261 | /* Now write out the remainder. Normally, this will fit in the |
1262 | buffer, but it's somewhat messier for line-buffered files, | |
1263 | so we let _IO_default_xsputn handle the general case. */ | |
0720f75c | 1264 | if (to_do) |
d18ea0c5 | 1265 | to_do -= _IO_default_xsputn (f, s+do_write, to_do); |
96aa2d94 RM |
1266 | } |
1267 | return n - to_do; | |
1268 | } | |
d18ea0c5 | 1269 | libc_hidden_ver (_IO_new_file_xsputn, _IO_file_xsputn) |
96aa2d94 | 1270 | |
9964a145 ZW |
1271 | size_t |
1272 | _IO_file_xsgetn (FILE *fp, void *data, size_t n) | |
96aa2d94 | 1273 | { |
9964a145 ZW |
1274 | size_t want, have; |
1275 | ssize_t count; | |
2e09a79a | 1276 | char *s = data; |
8fe0fd03 UD |
1277 | |
1278 | want = n; | |
1279 | ||
310f9518 UD |
1280 | if (fp->_IO_buf_base == NULL) |
1281 | { | |
1282 | /* Maybe we already have a push back pointer. */ | |
1283 | if (fp->_IO_save_base != NULL) | |
1284 | { | |
1285 | free (fp->_IO_save_base); | |
1286 | fp->_flags &= ~_IO_IN_BACKUP; | |
1287 | } | |
d18ea0c5 | 1288 | _IO_doallocbuf (fp); |
310f9518 UD |
1289 | } |
1290 | ||
8fe0fd03 | 1291 | while (want > 0) |
96aa2d94 | 1292 | { |
8fe0fd03 UD |
1293 | have = fp->_IO_read_end - fp->_IO_read_ptr; |
1294 | if (want <= have) | |
96aa2d94 | 1295 | { |
8fe0fd03 UD |
1296 | memcpy (s, fp->_IO_read_ptr, want); |
1297 | fp->_IO_read_ptr += want; | |
1298 | want = 0; | |
1299 | } | |
1300 | else | |
1301 | { | |
1302 | if (have > 0) | |
96aa2d94 | 1303 | { |
279eb600 | 1304 | s = __mempcpy (s, fp->_IO_read_ptr, have); |
279eb600 | 1305 | want -= have; |
8fe0fd03 | 1306 | fp->_IO_read_ptr += have; |
96aa2d94 | 1307 | } |
8fe0fd03 UD |
1308 | |
1309 | /* Check for backup and repeat */ | |
1310 | if (_IO_in_backup (fp)) | |
96aa2d94 | 1311 | { |
8fe0fd03 UD |
1312 | _IO_switch_to_main_get_area (fp); |
1313 | continue; | |
1314 | } | |
1315 | ||
1316 | /* If we now want less than a buffer, underflow and repeat | |
1317 | the copy. Otherwise, _IO_SYSREAD directly to | |
1318 | the user buffer. */ | |
6dd67bd5 UD |
1319 | if (fp->_IO_buf_base |
1320 | && want < (size_t) (fp->_IO_buf_end - fp->_IO_buf_base)) | |
8fe0fd03 UD |
1321 | { |
1322 | if (__underflow (fp) == EOF) | |
1323 | break; | |
1324 | ||
1325 | continue; | |
1326 | } | |
1327 | ||
4bca4c17 UD |
1328 | /* These must be set before the sysread as we might longjmp out |
1329 | waiting for input. */ | |
1330 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); | |
1331 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); | |
1332 | ||
279eb600 UD |
1333 | /* Try to maintain alignment: read a whole number of blocks. */ |
1334 | count = want; | |
1335 | if (fp->_IO_buf_base) | |
1336 | { | |
9964a145 | 1337 | size_t block_size = fp->_IO_buf_end - fp->_IO_buf_base; |
279eb600 UD |
1338 | if (block_size >= 128) |
1339 | count -= want % block_size; | |
1340 | } | |
1341 | ||
1342 | count = _IO_SYSREAD (fp, s, count); | |
96aa2d94 | 1343 | if (count <= 0) |
8fe0fd03 UD |
1344 | { |
1345 | if (count == 0) | |
1346 | fp->_flags |= _IO_EOF_SEEN; | |
1347 | else | |
1348 | fp->_flags |= _IO_ERR_SEEN; | |
1349 | ||
1350 | break; | |
1351 | } | |
23396375 | 1352 | |
96aa2d94 | 1353 | s += count; |
8fe0fd03 | 1354 | want -= count; |
4bca4c17 UD |
1355 | if (fp->_offset != _IO_pos_BAD) |
1356 | _IO_pos_adjust (fp->_offset, count); | |
96aa2d94 | 1357 | } |
96aa2d94 | 1358 | } |
8fe0fd03 UD |
1359 | |
1360 | return n - want; | |
96aa2d94 | 1361 | } |
d18ea0c5 | 1362 | libc_hidden_def (_IO_file_xsgetn) |
96aa2d94 | 1363 | |
3020f726 | 1364 | size_t |
9964a145 | 1365 | _IO_file_xsgetn_mmap (FILE *fp, void *data, size_t n) |
284749da | 1366 | { |
9964a145 | 1367 | size_t have; |
284749da | 1368 | char *read_ptr = fp->_IO_read_ptr; |
2e09a79a | 1369 | char *s = (char *) data; |
284749da UD |
1370 | |
1371 | have = fp->_IO_read_end - fp->_IO_read_ptr; | |
1372 | ||
1373 | if (have < n) | |
1374 | { | |
a1ffb40e | 1375 | if (__glibc_unlikely (_IO_in_backup (fp))) |
b39d5719 | 1376 | { |
b39d5719 | 1377 | s = __mempcpy (s, read_ptr, have); |
b39d5719 UD |
1378 | n -= have; |
1379 | _IO_switch_to_main_get_area (fp); | |
1380 | read_ptr = fp->_IO_read_ptr; | |
1381 | have = fp->_IO_read_end - fp->_IO_read_ptr; | |
1382 | } | |
1383 | ||
1384 | if (have < n) | |
1385 | { | |
acbee5f6 | 1386 | /* Check that we are mapping all of the file, in case it grew. */ |
a1ffb40e | 1387 | if (__glibc_unlikely (mmap_remap_check (fp))) |
acbee5f6 RM |
1388 | /* We punted mmap, so complete with the vanilla code. */ |
1389 | return s - (char *) data + _IO_XSGETN (fp, data, n); | |
1390 | ||
1391 | read_ptr = fp->_IO_read_ptr; | |
1392 | have = fp->_IO_read_end - read_ptr; | |
b39d5719 | 1393 | } |
284749da UD |
1394 | } |
1395 | ||
c4292489 UD |
1396 | if (have < n) |
1397 | fp->_flags |= _IO_EOF_SEEN; | |
1398 | ||
1399 | if (have != 0) | |
284749da UD |
1400 | { |
1401 | have = MIN (have, n); | |
b39d5719 | 1402 | s = __mempcpy (s, read_ptr, have); |
284749da UD |
1403 | fp->_IO_read_ptr = read_ptr + have; |
1404 | } | |
1405 | ||
b39d5719 | 1406 | return s - (char *) data; |
284749da UD |
1407 | } |
1408 | ||
3020f726 | 1409 | size_t |
9964a145 | 1410 | _IO_file_xsgetn_maybe_mmap (FILE *fp, void *data, size_t n) |
acbee5f6 RM |
1411 | { |
1412 | /* We only get here if this is the first attempt to read something. | |
1413 | Decide which operations to use and then punt to the chosen one. */ | |
1414 | ||
1415 | decide_maybe_mmap (fp); | |
1416 | return _IO_XSGETN (fp, data, n); | |
1417 | } | |
1418 | ||
94b68ee9 RM |
1419 | versioned_symbol (libc, _IO_new_do_write, _IO_do_write, GLIBC_2_1); |
1420 | versioned_symbol (libc, _IO_new_file_attach, _IO_file_attach, GLIBC_2_1); | |
1421 | versioned_symbol (libc, _IO_new_file_close_it, _IO_file_close_it, GLIBC_2_1); | |
1422 | versioned_symbol (libc, _IO_new_file_finish, _IO_file_finish, GLIBC_2_1); | |
1423 | versioned_symbol (libc, _IO_new_file_fopen, _IO_file_fopen, GLIBC_2_1); | |
1424 | versioned_symbol (libc, _IO_new_file_init, _IO_file_init, GLIBC_2_1); | |
1425 | versioned_symbol (libc, _IO_new_file_setbuf, _IO_file_setbuf, GLIBC_2_1); | |
1426 | versioned_symbol (libc, _IO_new_file_sync, _IO_file_sync, GLIBC_2_1); | |
1427 | versioned_symbol (libc, _IO_new_file_overflow, _IO_file_overflow, GLIBC_2_1); | |
1428 | versioned_symbol (libc, _IO_new_file_seekoff, _IO_file_seekoff, GLIBC_2_1); | |
1429 | versioned_symbol (libc, _IO_new_file_underflow, _IO_file_underflow, GLIBC_2_1); | |
1430 | versioned_symbol (libc, _IO_new_file_write, _IO_file_write, GLIBC_2_1); | |
1431 | versioned_symbol (libc, _IO_new_file_xsputn, _IO_file_xsputn, GLIBC_2_1); |