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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. |
40a55d20 | 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. | |
40a55d20 | 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. |
40a55d20 | 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/>. |
40a55d20 | 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 | |
40a982a9 | 27 | #include <stdlib.h> |
96aa2d94 | 28 | #include <libioP.h> |
d64b6ad0 | 29 | #include <errno.h> |
96aa2d94 | 30 | |
9964a145 ZW |
31 | off64_t |
32 | _IO_seekoff_unlocked (FILE *fp, off64_t offset, int dir, int mode) | |
96aa2d94 | 33 | { |
d64b6ad0 UD |
34 | if (dir != _IO_seek_cur && dir != _IO_seek_set && dir != _IO_seek_end) |
35 | { | |
36 | __set_errno (EINVAL); | |
37 | return EOF; | |
4a582094 UD |
38 | } |
39 | ||
96aa2d94 RM |
40 | /* If we have a backup buffer, get rid of it, since the __seekoff |
41 | callback may not know to do the right thing about it. | |
42 | This may be over-kill, but it'll do for now. TODO */ | |
77fe0b9c | 43 | if (mode != 0 && ((_IO_fwide (fp, 0) < 0 && _IO_have_backup (fp)) |
0b9225cd | 44 | || (_IO_fwide (fp, 0) > 0 && _IO_have_wbackup (fp)))) |
96aa2d94 RM |
45 | { |
46 | if (dir == _IO_seek_cur && _IO_in_backup (fp)) | |
40a982a9 | 47 | { |
bbdef797 | 48 | if (_IO_vtable_offset (fp) != 0 || fp->_mode <= 0) |
40a982a9 UD |
49 | offset -= fp->_IO_read_end - fp->_IO_read_ptr; |
50 | else | |
51 | abort (); | |
52 | } | |
77fe0b9c | 53 | if (_IO_fwide (fp, 0) < 0) |
d18ea0c5 | 54 | _IO_free_backup_area (fp); |
77fe0b9c | 55 | else |
d18ea0c5 | 56 | _IO_free_wbackup_area (fp); |
96aa2d94 | 57 | } |
00bc5db0 | 58 | |
52a16e58 UD |
59 | return _IO_SEEKOFF (fp, offset, dir, mode); |
60 | } | |
61 | ||
62 | ||
9964a145 ZW |
63 | off64_t |
64 | _IO_seekoff (FILE *fp, off64_t offset, int dir, int mode) | |
52a16e58 | 65 | { |
9964a145 | 66 | off64_t retval; |
52a16e58 | 67 | |
0261d33f | 68 | _IO_acquire_lock (fp); |
52a16e58 | 69 | retval = _IO_seekoff_unlocked (fp, offset, dir, mode); |
0261d33f | 70 | _IO_release_lock (fp); |
61eb22d3 | 71 | return retval; |
96aa2d94 | 72 | } |