| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 1993-2015 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 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. |
| 8 | |
| 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 |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. |
| 17 | |
| 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. */ |
| 26 | |
| 27 | #include <stdlib.h> |
| 28 | #include <libioP.h> |
| 29 | #include <errno.h> |
| 30 | #ifndef errno |
| 31 | extern int errno; |
| 32 | #endif |
| 33 | #ifndef __set_errno |
| 34 | # define __set_errno(Val) errno = (Val) |
| 35 | #endif |
| 36 | |
| 37 | _IO_off64_t |
| 38 | _IO_seekoff_unlocked (fp, offset, dir, mode) |
| 39 | _IO_FILE *fp; |
| 40 | _IO_off64_t offset; |
| 41 | int dir; |
| 42 | int mode; |
| 43 | { |
| 44 | if (dir != _IO_seek_cur && dir != _IO_seek_set && dir != _IO_seek_end) |
| 45 | { |
| 46 | __set_errno (EINVAL); |
| 47 | return EOF; |
| 48 | } |
| 49 | |
| 50 | /* If we have a backup buffer, get rid of it, since the __seekoff |
| 51 | callback may not know to do the right thing about it. |
| 52 | This may be over-kill, but it'll do for now. TODO */ |
| 53 | if (mode != 0 && ((_IO_fwide (fp, 0) < 0 && _IO_have_backup (fp)) |
| 54 | || (_IO_fwide (fp, 0) > 0 && _IO_have_wbackup (fp)))) |
| 55 | { |
| 56 | if (dir == _IO_seek_cur && _IO_in_backup (fp)) |
| 57 | { |
| 58 | if (_IO_vtable_offset (fp) != 0 || fp->_mode <= 0) |
| 59 | offset -= fp->_IO_read_end - fp->_IO_read_ptr; |
| 60 | else |
| 61 | abort (); |
| 62 | } |
| 63 | if (_IO_fwide (fp, 0) < 0) |
| 64 | _IO_free_backup_area (fp); |
| 65 | else |
| 66 | _IO_free_wbackup_area (fp); |
| 67 | } |
| 68 | |
| 69 | return _IO_SEEKOFF (fp, offset, dir, mode); |
| 70 | } |
| 71 | |
| 72 | |
| 73 | _IO_off64_t |
| 74 | _IO_seekoff (fp, offset, dir, mode) |
| 75 | _IO_FILE *fp; |
| 76 | _IO_off64_t offset; |
| 77 | int dir; |
| 78 | int mode; |
| 79 | { |
| 80 | _IO_off64_t retval; |
| 81 | |
| 82 | _IO_acquire_lock (fp); |
| 83 | retval = _IO_seekoff_unlocked (fp, offset, dir, mode); |
| 84 | _IO_release_lock (fp); |
| 85 | return retval; |
| 86 | } |