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bbdef797 UD |
1 | /* Copyright (C) 1993, 1997, 1998, 1999, 2001, 2002, 2003 |
2 | Free Software Foundation, Inc. | |
41bdb6e2 | 3 | This file is part of the GNU C Library. |
40a55d20 | 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. | |
40a55d20 | 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 | |
40a55d20 | 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
41bdb6e2 | 13 | Lesser General Public License for more details. |
40a55d20 | 14 | |
41bdb6e2 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. | |
40a55d20 | 19 | |
41bdb6e2 AJ |
20 | As a special exception, if you link the code in this file with |
21 | files compiled with a GNU compiler to produce an executable, | |
22 | that does not cause the resulting executable to be covered by | |
23 | the GNU Lesser General Public License. This exception does not | |
24 | however invalidate any other reasons why the executable file | |
25 | might be covered by the GNU Lesser General Public License. | |
26 | This exception applies to code released by its copyright holders | |
27 | in files containing the exception. */ | |
96aa2d94 | 28 | |
40a982a9 | 29 | #include <stdlib.h> |
96aa2d94 | 30 | #include <libioP.h> |
d64b6ad0 UD |
31 | #include <errno.h> |
32 | #ifndef errno | |
33 | extern int errno; | |
34 | #endif | |
35 | #ifndef __set_errno | |
36 | # define __set_errno(Val) errno = (Val) | |
37 | #endif | |
96aa2d94 | 38 | |
d64b6ad0 | 39 | _IO_off64_t |
52a16e58 | 40 | _IO_seekoff_unlocked (fp, offset, dir, mode) |
40a55d20 | 41 | _IO_FILE *fp; |
dfd2257a | 42 | _IO_off64_t offset; |
40a55d20 UD |
43 | int dir; |
44 | int mode; | |
96aa2d94 | 45 | { |
d64b6ad0 UD |
46 | if (dir != _IO_seek_cur && dir != _IO_seek_set && dir != _IO_seek_end) |
47 | { | |
48 | __set_errno (EINVAL); | |
49 | return EOF; | |
4a582094 UD |
50 | } |
51 | ||
96aa2d94 RM |
52 | /* If we have a backup buffer, get rid of it, since the __seekoff |
53 | callback may not know to do the right thing about it. | |
54 | This may be over-kill, but it'll do for now. TODO */ | |
77fe0b9c | 55 | if (mode != 0 && ((_IO_fwide (fp, 0) < 0 && _IO_have_backup (fp)) |
02b3c905 UD |
56 | || ( |
57 | #if defined _LIBC && SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) | |
58 | __builtin_expect (&_IO_stdin_used != NULL, 1) && | |
59 | #endif | |
60 | _IO_fwide (fp, 0) > 0 && _IO_have_wbackup (fp)) | |
61 | )) | |
96aa2d94 RM |
62 | { |
63 | if (dir == _IO_seek_cur && _IO_in_backup (fp)) | |
40a982a9 | 64 | { |
bbdef797 | 65 | if (_IO_vtable_offset (fp) != 0 || fp->_mode <= 0) |
40a982a9 UD |
66 | offset -= fp->_IO_read_end - fp->_IO_read_ptr; |
67 | else | |
68 | abort (); | |
69 | } | |
77fe0b9c UD |
70 | if (_IO_fwide (fp, 0) < 0) |
71 | INTUSE(_IO_free_backup_area) (fp); | |
72 | else | |
73 | INTUSE(_IO_free_wbackup_area) (fp); | |
96aa2d94 | 74 | } |
00bc5db0 | 75 | |
52a16e58 UD |
76 | return _IO_SEEKOFF (fp, offset, dir, mode); |
77 | } | |
78 | ||
79 | ||
80 | _IO_off64_t | |
81 | _IO_seekoff (fp, offset, dir, mode) | |
82 | _IO_FILE *fp; | |
83 | _IO_off64_t offset; | |
84 | int dir; | |
85 | int mode; | |
86 | { | |
87 | _IO_off64_t retval; | |
88 | ||
89 | _IO_cleanup_region_start ((void (*) __P ((void *))) _IO_funlockfile, fp); | |
90 | _IO_flockfile (fp); | |
91 | ||
92 | retval = _IO_seekoff_unlocked (fp, offset, dir, mode); | |
96aa2d94 | 93 | |
c0fb8a56 UD |
94 | _IO_funlockfile (fp); |
95 | _IO_cleanup_region_end (0); | |
61eb22d3 | 96 | return retval; |
96aa2d94 | 97 | } |