38 lines
1.1 KiB
C
38 lines
1.1 KiB
C
|
/* An ftell() function that works around platform bugs.
|
||
|
|
Copyright (C) 2007-2020 Free Software Foundation, Inc.
|
||
|
|
|
||
|
|
This program is free software: you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU General Public License as published by
|
||
|
|
the Free Software Foundation; either version 3 of the License, or
|
||
|
|
(at your option) any later version.
|
||
|
|
|
||
|
|
This program is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
GNU General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU General Public License
|
||
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
#include <config.h>
|
||
|
|
|
||
|
|
/* Specification. */
|
||
|
|
#include <stdio.h>
|
||
|
|
|
||
|
|
#include <errno.h>
|
||
|
|
#include <limits.h>
|
||
|
|
|
||
|
|
long
|
||
|
|
ftell (FILE *fp)
|
||
|
|
{
|
||
|
|
/* Use the replacement ftello function with all its workarounds. */
|
||
|
|
off_t offset = ftello (fp);
|
||
|
|
if (LONG_MIN <= offset && offset <= LONG_MAX)
|
||
|
|
return /* (long) */ offset;
|
||
|
|
else
|
||
|
|
{
|
||
|
|
errno = EOVERFLOW;
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
}
|