49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
/* $OpenBSD: isinf.c,v 1.10 2013/11/12 06:09:48 deraadt Exp $ */
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/*
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* Copyright (c) 2008 Martynas Venckus <martynas@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <machine/ieee.h>
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#include <float.h>
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#include <math.h>
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int
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__isinf(double d)
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{
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struct ieee_double *p = (struct ieee_double *)&d;
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return (p->dbl_exp == DBL_EXP_INFNAN &&
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p->dbl_frach == 0 && p->dbl_fracl == 0);
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}
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int
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__isinff(float f)
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{
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struct ieee_single *p = (struct ieee_single *)&f;
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return (p->sng_exp == SNG_EXP_INFNAN && p->sng_frac == 0);
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}
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#if LDBL_MANT_DIG == DBL_MANT_DIG
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__strong_alias(__isinfl, __isinf);
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#endif /* LDBL_MANT_DIG == DBL_MANT_DIG */
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/*
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* 3BSD compatibility aliases.
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*/
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__strong_alias(isinf, __isinf);
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__strong_alias(isinff, __isinff);
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