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/* Test of freadptr() 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>, 2008. */
#include <config.h>
#include "freadptr.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "macros.h"
int
main (int argc, char **argv)
{
int nbytes = atoi (argv[1]);
{
void *buf = malloc (nbytes);
ASSERT (fread (buf, 1, nbytes, stdin) == nbytes);
free (buf);
}
if (lseek (0, 0, SEEK_CUR) == nbytes)
{
/* An unbuffered stdio, such as BeOS or on uClibc compiled without
__STDIO_BUFFERS. Or stdin is a pipe. */
size_t size;
ASSERT (freadptr (stdin, &size) == NULL);
}
else
{
/* Normal buffered stdio. */
const char stdin_contents[] =
"#!/bin/sh\n\n${CHECKER} ./test-freadptr${EXEEXT} 5 < \"$srcdir/test-freadptr.sh\" || exit 1\ncat \"$srcdir/test-freadptr.sh\" | ${CHECKER} ./test-freadptr${EXEEXT} 5 || exit 1\nexit 0\n";
const char *expected = stdin_contents + nbytes;
size_t available1;
size_t available2;
size_t available3;
/* Test normal behaviour. */
{
const char *ptr = freadptr (stdin, &available1);
ASSERT (ptr != NULL);
ASSERT (available1 != 0);
ASSERT (available1 <= strlen (expected));
ASSERT (memcmp (ptr, expected, available1) == 0);
}
/* Test behaviour after normal ungetc. */
ungetc (fgetc (stdin), stdin);
{
const char *ptr = freadptr (stdin, &available2);
if (ptr != NULL)
{
ASSERT (available2 == available1);
ASSERT (memcmp (ptr, expected, available2) == 0);
}
}
/* Test behaviour after arbitrary ungetc. */
fgetc (stdin);
ungetc ('@', stdin);
{
const char *ptr = freadptr (stdin, &available3);
if (ptr != NULL)
{
ASSERT (available3 == 1 || available3 == available1);
ASSERT (ptr[0] == '@');
if (available3 > 1)
{
ASSERT (memcmp (ptr + 1, expected + 1, available3 - 1) == 0);
}
}
}
}
/* Free memory allocated during ungetc(). */
fclose (stdin);
return 0;
}
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