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04277e02 | 1 | /* Copyright (C) 1993-2019 Free Software Foundation, Inc. |
41bdb6e2 | 2 | This file is part of the GNU C Library. |
96aa2d94 | 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. | |
96aa2d94 | 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. |
96aa2d94 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. | |
96aa2d94 | 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 RM |
26 | |
27 | #include "libioP.h" | |
ef52edfc | 28 | #include <stdlib.h> |
96aa2d94 RM |
29 | #include <errno.h> |
30 | /* ANSI explicily requires setting errno to a positive value on failure. */ | |
31 | ||
32 | long int | |
9964a145 | 33 | _IO_ftell (FILE *fp) |
96aa2d94 | 34 | { |
9964a145 | 35 | off64_t pos; |
96aa2d94 | 36 | CHECK_FILE (fp, -1L); |
0261d33f | 37 | _IO_acquire_lock (fp); |
52a16e58 | 38 | pos = _IO_seekoff_unlocked (fp, 0, _IO_seek_cur, 0); |
3447be7b | 39 | if (_IO_in_backup (fp) && pos != _IO_pos_BAD) |
d64b6ad0 | 40 | { |
bbdef797 | 41 | if (_IO_vtable_offset (fp) != 0 || fp->_mode <= 0) |
d64b6ad0 | 42 | pos -= fp->_IO_save_end - fp->_IO_save_base; |
d64b6ad0 | 43 | } |
0261d33f | 44 | _IO_release_lock (fp); |
96aa2d94 RM |
45 | if (pos == _IO_pos_BAD) |
46 | { | |
96aa2d94 | 47 | if (errno == 0) |
c4029823 | 48 | __set_errno (EIO); |
3efdabe7 RM |
49 | return -1L; |
50 | } | |
9964a145 | 51 | if ((off64_t) (long int) pos != pos) |
3efdabe7 | 52 | { |
3efdabe7 | 53 | __set_errno (EOVERFLOW); |
96aa2d94 RM |
54 | return -1L; |
55 | } | |
d64b6ad0 | 56 | return pos; |
96aa2d94 | 57 | } |
d18ea0c5 | 58 | libc_hidden_def (_IO_ftell) |
96aa2d94 RM |
59 | |
60 | weak_alias (_IO_ftell, ftell) |