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/* Test that always-zero lseek does not cause fclose failure after fread.
Copyright (C) 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 <errno.h>
#include <stdio.h>
#include <string.h>
#include <support/check.h>
#include <support/xstdio.h>
int
do_test (void)
{
for (int do_ftello = 0; do_ftello < 2; ++do_ftello)
{
FILE *fp = xfopen ("/dev/zero", "r");
char buf[17];
memset (buf, 0xcc, sizeof (buf));
xfread (buf, 1, sizeof (buf), fp);
static const char zeros[sizeof (buf)] = { 0 };
TEST_COMPARE_BLOB (buf, sizeof (buf), zeros, sizeof (zeros));
if (do_ftello)
{
errno = 0;
TEST_COMPARE (ftello (fp), -1);
TEST_COMPARE (errno, ESPIPE);
}
/* Do not use xfclose because it flushes first. */
TEST_COMPARE (fclose (fp), 0);
}
return 0;
}
#include <support/test-driver.c>
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