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96aa2d94 | 1 | /* |
edf5b2d7 | 2 | Copyright (C) 1993, 1995, 1996 Free Software Foundation, Inc. |
96aa2d94 RM |
3 | |
4 | This file is part of the GNU IO Library. This library is free | |
5 | software; you can redistribute it and/or modify it under the | |
6 | terms of the GNU General Public License as published by the | |
7 | Free Software Foundation; either version 2, or (at your option) | |
8 | any later version. | |
9 | ||
10 | This library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this library; see the file COPYING. If not, write to the Free | |
17 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
18 | ||
19 | As a special exception, if you link this library with files | |
20 | compiled with a GNU compiler to produce an executable, this does not cause | |
21 | the resulting executable to be covered by the GNU General Public License. | |
22 | This exception does not however invalidate any other reasons why | |
23 | the executable file might be covered by the GNU General Public License. */ | |
24 | ||
25 | #include "libioP.h" | |
26 | #include <errno.h> | |
27 | /* ANSI explicily requires setting errno to a positive value on failure. */ | |
28 | ||
29 | long int | |
30 | _IO_ftell (fp) | |
31 | _IO_FILE* fp; | |
32 | { | |
33 | _IO_pos_t pos; | |
34 | CHECK_FILE (fp, -1L); | |
edf5b2d7 | 35 | __libc_cleanup_region_start (&_IO_funlockfile, fp); |
7c713e28 | 36 | _IO_flockfile (fp); |
96aa2d94 | 37 | pos = _IO_seekoff (fp, 0, _IO_seek_cur, 0); |
edf5b2d7 | 38 | __libc_cleanup_region_end (1); |
96aa2d94 RM |
39 | if (pos == _IO_pos_BAD) |
40 | { | |
41 | #ifdef EIO | |
42 | if (errno == 0) | |
c4029823 | 43 | __set_errno (EIO); |
96aa2d94 RM |
44 | #endif |
45 | return -1L; | |
46 | } | |
47 | return _IO_pos_as_off (pos); | |
48 | } | |
49 | ||
50 | weak_alias (_IO_ftell, ftell) |