85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/* Test of freadahead() function.
|
|
Copyright (C) 2007-2008 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 <http://www.gnu.org/licenses/>. */
|
|
|
|
/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
|
|
|
|
#include <config.h>
|
|
|
|
#include "freadahead.h"
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
#define ASSERT(expr) \
|
|
do \
|
|
{ \
|
|
if (!(expr)) \
|
|
{ \
|
|
fprintf (stderr, "%s:%d: assertion failed\n", __FILE__, __LINE__); \
|
|
fflush (stderr); \
|
|
abort (); \
|
|
} \
|
|
} \
|
|
while (0)
|
|
|
|
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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|