1 /* Test of fseek() function.
2 Copyright (C) 2007, 2008 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 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
24 #define ASSERT(expr) \
29 fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
37 main (int argc, char **argv)
39 /* Assume stdin is non-empty, seekable, and starts with '#!/bin/sh'
41 int expected = argc > 1 ? 0 : -1;
42 ASSERT (fseek (stdin, 0, SEEK_CUR) == expected);
45 /* Test that fseek discards previously read ungetc data. */
46 int ch = fgetc (stdin);
48 ASSERT (ungetc (ch, stdin) == ch);
49 ASSERT (fseek (stdin, 2, SEEK_SET) == 0);
50 /* Test that fseek discards random ungetc data. */
53 ASSERT (ungetc (ch ^ 0xff, stdin) == (ch ^ 0xff));
54 ASSERT (fseek (stdin, 0, SEEK_END) == 0);
55 ASSERT (fgetc (stdin) == EOF);
56 /* Test that fseek resets end-of-file marker. */
57 ASSERT (feof (stdin));
58 ASSERT (fseek (stdin, 0, SEEK_END) == 0);
59 ASSERT (!feof (stdin));