1 /* Test of fseeko() function.
2 Copyright (C) 2007-2011 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. */
21 /* None of the files accessed by this test are large, so disable the
22 fseek link warning if we are not using the gnulib fseek module. */
23 #define _GL_NO_LARGE_FILES
26 #include "signature.h"
27 SIGNATURE_CHECK (fseeko, int, (FILE *, off_t, int));
32 #ifndef FUNC_UNGETC_BROKEN
33 # define FUNC_UNGETC_BROKEN 0
37 main (int argc, char **argv _GL_UNUSED)
39 /* Assume stdin is non-empty, seekable, and starts with '#!/bin/sh'
41 int expected = argc > 1 ? 0 : -1;
42 /* Exit with success only if fseek/fseeko agree. */
43 int r1 = fseeko (stdin, 0, SEEK_CUR);
44 int r2 = fseek (stdin, 0, SEEK_CUR);
45 ASSERT (r1 == r2 && r1 == expected);
48 /* Test that fseek discards previously read ungetc data. */
49 int ch = fgetc (stdin);
51 ASSERT (ungetc (ch, stdin) == ch);
52 ASSERT (fseeko (stdin, 2, SEEK_SET) == 0);
57 if (FUNC_UNGETC_BROKEN)
59 fputs ("Skipping test: ungetc cannot handle arbitrary bytes\n",
63 /* Test that fseek discards random ungetc data. */
64 ASSERT (ungetc (ch ^ 0xff, stdin) == (ch ^ 0xff));
66 ASSERT (fseeko (stdin, 0, SEEK_END) == 0);
67 ASSERT (fgetc (stdin) == EOF);
68 /* Test that fseek resets end-of-file marker. */
69 ASSERT (feof (stdin));
70 ASSERT (fseeko (stdin, 0, SEEK_END) == 0);
71 ASSERT (!feof (stdin));