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/* $OpenBSD: isnan.c,v 1.5 2011/05/30 17:28:15 martynas Exp $ */
/*
* Copyright (c) 2008 Martynas Venckus <martynas@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* LINTLIBRARY */
#include <sys/types.h>
#include <sys/cdefs.h>
#include <machine/ieee.h>
#include <float.h>
int
__isnan(double d)
{
struct ieee_double *p = (struct ieee_double *)&d;
return (p->dbl_exp == DBL_EXP_INFNAN &&
(p->dbl_frach != 0 || p->dbl_fracl != 0));
}
int
__isnanf(float f)
{
struct ieee_single *p = (struct ieee_single *)&f;
return (p->sng_exp == SNG_EXP_INFNAN && p->sng_frac != 0);
}
#if LDBL_MANT_DIG == 53
#ifdef lint
/* PROTOLIB1 */
int __isnanl(long double);
#else /* lint */
__weak_alias(__isnanl, __isnan);
#endif /* lint */
#endif /* LDBL_MANT_DIG == 53 */
/*
* 3BSD compatibility aliases.
*/
__weak_alias(isnan, __isnan);
__weak_alias(isnanf, __isnanf);
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