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/* Test of fseek() function.
Copyright (C) 2007-2023 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
#include <config.h>
/* None of the files accessed by this test are large, so disable the
fseek link warning if the user requested GNULIB_POSIXCHECK. */
#define _GL_NO_LARGE_FILES
#include <stdio.h>
#include "signature.h"
SIGNATURE_CHECK (fseek, int, (FILE *, long, int));
#include "macros.h"
#ifndef FUNC_UNGETC_BROKEN
# define FUNC_UNGETC_BROKEN 0
#endif
int
main (int argc, char **argv)
{
/* Assume stdin is non-empty, seekable, and starts with '#!/bin/sh'
iff argc > 1. */
int expected = argc > 1 ? 0 : -1;
ASSERT (fseek (stdin, 0, SEEK_CUR) == expected);
if (argc > 1)
{
/* Test that fseek discards previously read ungetc data. */
int ch = fgetc (stdin);
ASSERT (ch == '#');
ASSERT (ungetc (ch, stdin) == ch);
ASSERT (fseek (stdin, 2, SEEK_SET) == 0);
ch = fgetc (stdin);
ASSERT (ch == '/');
if (2 < argc)
{
if (FUNC_UNGETC_BROKEN)
{
fputs ("Skipping test: ungetc cannot handle arbitrary bytes\n",
stderr);
return 77;
}
/* Test that fseek discards random ungetc data. */
ASSERT (ungetc (ch ^ 0xff, stdin) == (ch ^ 0xff));
}
ASSERT (fseek (stdin, 0, SEEK_END) == 0);
ASSERT (fgetc (stdin) == EOF);
/* Test that fseek resets end-of-file marker. */
ASSERT (feof (stdin));
ASSERT (fseek (stdin, 0, SEEK_END) == 0);
ASSERT (!feof (stdin));
}
return 0;
}
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