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/* Test of freadahead() function.
Copyright (C) 2007-2022 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>
#include "freadahead.h"
#include <stdlib.h>
#include <unistd.h>
#include "macros.h"
int
main (int argc, char **argv)
{
int nbytes = atoi (argv[1]);
if (nbytes > 0)
{
void *buf = malloc (nbytes);
ASSERT (fread (buf, 1, nbytes, stdin) == nbytes);
free (buf);
}
if (nbytes == 0)
ASSERT (freadahead (stdin) == 0);
else
{
if (lseek (0, 0, SEEK_CUR) == nbytes)
/* An unbuffered stdio, such as BeOS or on uClibc compiled without
__STDIO_BUFFERS. */
ASSERT (freadahead (stdin) == 0);
else
{
/* Normal buffered stdio. */
size_t buffered;
int c, c2;
ASSERT (freadahead (stdin) != 0);
buffered = freadahead (stdin);
c = fgetc (stdin);
ASSERT (freadahead (stdin) == buffered - 1);
ungetc (c, stdin);
ASSERT (freadahead (stdin) == buffered);
c2 = fgetc (stdin);
ASSERT (c2 == c);
ASSERT (freadahead (stdin) == buffered - 1);
c = '@';
ungetc (c, stdin);
ASSERT (freadahead (stdin) == buffered);
c2 = fgetc (stdin);
ASSERT (c2 == c);
ASSERT (freadahead (stdin) == buffered - 1);
}
}
/* Free memory allocated during ungetc(). */
fclose (stdin);
return 0;
}
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