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/* Test for open_memstream BZ #21037.
Copyright (C) 2018-2025 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 "tst-memstream.h"
static void
mcheck_abort (enum mcheck_status ev)
{
printf ("mecheck failed with status %d\n", (int) ev);
exit (1);
}
static int
do_test (void)
{
mcheck_pedantic (mcheck_abort);
/* Check if freopen proper fflush the stream. */
{
CHAR_T old[] = W("old");
CHAR_T *buf = old;
size_t size;
FILE *fp = OPEN_MEMSTREAM (&buf, &size);
TEST_VERIFY_EXIT (fp != NULL);
FPUTS (W("new"), fp);
/* The stream buffer pointer should be updated with only a fflush or
fclose. */
TEST_COMPARE (STRCMP (buf, old), 0);
/* The old stream should be fflush the stream, even for an invalid
streams. */
FILE *nfp = freopen ("invalid-file", "r", fp);
TEST_VERIFY_EXIT (nfp == NULL);
TEST_VERIFY (STRCMP (buf, W("new")) == 0);
TEST_COMPARE_BLOB (buf, STRLEN (buf) * sizeof (CHAR_T),
W("new"), STRLEN (W("new")) * sizeof (CHAR_T));
TEST_COMPARE (fclose (fp), 0);
free (buf);
}
return 0;
}
#include <support/test-driver.c>
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