50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
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/* Test printf with x86-specific non-normal long double value.
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Copyright (C) 2020-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <string.h>
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#include <support/check.h>
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/* Fill the stack with non-zero values. This makes a crash in
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snprintf more likely. */
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static void __attribute__ ((noinline, noclone))
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fill_stack (void)
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{
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char buffer[65536];
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memset (buffer, 0xc0, sizeof (buffer));
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asm ("" ::: "memory");
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}
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static int
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do_test (void)
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{
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fill_stack ();
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long double value;
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memcpy (&value, "\x00\x04\x00\x00\x00\x00\x00\x00\x00\x04", 10);
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char buf[30];
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int ret = snprintf (buf, sizeof (buf), "%Lg", value);
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TEST_COMPARE (ret, strlen (buf));
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TEST_COMPARE_STRING (buf, "nan");
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return 0;
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}
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#include <support/test-driver.c>
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