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/* Test printf with x86-specific non-normal long double value.
Copyright (C) 2020-2025 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 <stdio.h>
#include <string.h>
#include <support/check.h>
/* Fill the stack with non-zero values. This makes a crash in
snprintf more likely. */
static void __attribute_optimization_barrier__
fill_stack (void)
{
char buffer[65536];
memset (buffer, 0xc0, sizeof (buffer));
asm ("" ::: "memory");
}
static int
do_test (void)
{
fill_stack ();
long double value;
memcpy (&value, "\x00\x04\x00\x00\x00\x00\x00\x00\x00\x04", 10);
char buf[30];
int ret = snprintf (buf, sizeof (buf), "%Lg", value);
TEST_COMPARE (ret, strlen (buf));
TEST_COMPARE_STRING (buf, "nan");
return 0;
}
#include <support/test-driver.c>
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