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1 /* An ftell() function that works around platform bugs.
2 Copyright (C) 2007-2017 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program 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
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 #include <config.h>
19 /* Specification. */
20 #include <stdio.h>
22 #include <errno.h>
23 #include <limits.h>
26 ftell (FILE *fp)
28 /* Use the replacement ftello function with all its workarounds. */
29 off_t offset = ftello (fp);
30 if (LONG_MIN <= offset && offset <= LONG_MAX)
31 return /* (long) */ offset;
34 errno = EOVERFLOW;
35 return -1;