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/* $OpenBSD: fpclassify.c,v 1.6 2012/12/05 23:19:59 deraadt 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 <machine/ieee.h>
#include <float.h>
#include <math.h>
int
__fpclassify(double d)
{
struct ieee_double *p = (struct ieee_double *)&d;
if (p->dbl_exp == 0) {
if (p->dbl_frach == 0 && p->dbl_fracl == 0)
return FP_ZERO;
else
return FP_SUBNORMAL;
}
if (p->dbl_exp == DBL_EXP_INFNAN) {
if (p->dbl_frach == 0 && p->dbl_fracl == 0)
return FP_INFINITE;
else
return FP_NAN;
}
return FP_NORMAL;
}
int
__fpclassifyf(float f)
{
struct ieee_single *p = (struct ieee_single *)&f;
if (p->sng_exp == 0) {
if (p->sng_frac == 0)
return FP_ZERO;
else
return FP_SUBNORMAL;
}
if (p->sng_exp == SNG_EXP_INFNAN) {
if (p->sng_frac == 0)
return FP_INFINITE;
else
return FP_NAN;
}
return FP_NORMAL;
}
#if LDBL_MANT_DIG == 53
#ifdef lint
/* PROTOLIB1 */
int __fpclassifyl(long double);
#else /* lint */
__weak_alias(__fpclassifyl, __fpclassify);
#endif /* lint */
#endif /* LDBL_MANT_DIG == 53 */
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