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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 | 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/>. | |
40a55d20 | 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. */ | |
96aa2d94 | 27 | |
40a982a9 | 28 | #include <stdlib.h> |
96aa2d94 | 29 | #include <libioP.h> |
d64b6ad0 UD |
30 | #include <errno.h> |
31 | #ifndef errno | |
32 | extern int errno; | |
33 | #endif | |
34 | #ifndef __set_errno | |
35 | # define __set_errno(Val) errno = (Val) | |
36 | #endif | |
96aa2d94 | 37 | |
d64b6ad0 | 38 | _IO_off64_t |
52a16e58 | 39 | _IO_seekoff_unlocked (fp, offset, dir, mode) |
40a55d20 | 40 | _IO_FILE *fp; |
dfd2257a | 41 | _IO_off64_t offset; |
40a55d20 UD |
42 | int dir; |
43 | int mode; | |
96aa2d94 | 44 | { |
d64b6ad0 UD |
45 | if (dir != _IO_seek_cur && dir != _IO_seek_set && dir != _IO_seek_end) |
46 | { | |
47 | __set_errno (EINVAL); | |
48 | return EOF; | |
4a582094 UD |
49 | } |
50 | ||
96aa2d94 RM |
51 | /* If we have a backup buffer, get rid of it, since the __seekoff |
52 | callback may not know to do the right thing about it. | |
53 | This may be over-kill, but it'll do for now. TODO */ | |
77fe0b9c | 54 | if (mode != 0 && ((_IO_fwide (fp, 0) < 0 && _IO_have_backup (fp)) |
0b9225cd | 55 | || (_IO_fwide (fp, 0) > 0 && _IO_have_wbackup (fp)))) |
96aa2d94 RM |
56 | { |
57 | if (dir == _IO_seek_cur && _IO_in_backup (fp)) | |
40a982a9 | 58 | { |
bbdef797 | 59 | if (_IO_vtable_offset (fp) != 0 || fp->_mode <= 0) |
40a982a9 UD |
60 | offset -= fp->_IO_read_end - fp->_IO_read_ptr; |
61 | else | |
62 | abort (); | |
63 | } | |
77fe0b9c UD |
64 | if (_IO_fwide (fp, 0) < 0) |
65 | INTUSE(_IO_free_backup_area) (fp); | |
66 | else | |
67 | INTUSE(_IO_free_wbackup_area) (fp); | |
96aa2d94 | 68 | } |
00bc5db0 | 69 | |
52a16e58 UD |
70 | return _IO_SEEKOFF (fp, offset, dir, mode); |
71 | } | |
72 | ||
73 | ||
74 | _IO_off64_t | |
75 | _IO_seekoff (fp, offset, dir, mode) | |
76 | _IO_FILE *fp; | |
77 | _IO_off64_t offset; | |
78 | int dir; | |
79 | int mode; | |
80 | { | |
81 | _IO_off64_t retval; | |
82 | ||
0261d33f | 83 | _IO_acquire_lock (fp); |
52a16e58 | 84 | retval = _IO_seekoff_unlocked (fp, offset, dir, mode); |
0261d33f | 85 | _IO_release_lock (fp); |
61eb22d3 | 86 | return retval; |
96aa2d94 | 87 | } |