1 /* Test of fseeko() function.
2 Copyright (C) 2007-2012 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
));