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/* fmemopen tests for BZ#1930 and BZ#20005.
Copyright (C) 2016-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
/* Check if fflush does not reset the file position. */
static int
do_test (void)
{
char buffer[500] = "x";
FILE *stream = fmemopen (buffer, sizeof (buffer), "r+");
if (stream == NULL)
{
printf ("error: fmemopen could not open stream\n");
return 1;
}
const char test[] = "test";
size_t r = fwrite (test, sizeof (char), sizeof (test), stream);
if (r != sizeof (test))
{
printf ("error: fwrite returned %zu, expected %zu\n", r, sizeof (test));
return 1;
}
r = ftell (stream);
if (r != sizeof (test))
{
printf ("error: ftell return %zu, expected %zu\n", r, sizeof (test));
return 1;
}
if (fflush (stream) != 0)
{
printf ("error: fflush failed\n");
return 1;
}
r = ftell (stream);
if (r != sizeof (test))
{
printf ("error: ftell return %zu, expected %zu\n", r, sizeof (test));
return 1;
}
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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