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1/* An ftell() function that works around platform bugs.
2 Copyright (C) 2007-2023 Free Software Foundation, Inc.
3
4 This file is free software: you can redistribute it and/or modify
5 it under the terms of the GNU Lesser General Public License as
6 published by the Free Software Foundation; either version 2.1 of the
7 License, or (at your option) any later version.
8
9 This file 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 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public License
15 along with this program. If not, see <https://www.gnu.org/licenses/>. */
16
17#include <config.h>
18
19/* Specification. */
20#include <stdio.h>
21
22#include <errno.h>
23#include <limits.h>
24
25long
26ftell (FILE *fp)
27{
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;
32 else
33 {
34 errno = EOVERFLOW;
35 return -1;
36 }
37}