1 /* $OpenBSD: isinf.c,v 1.2 2008/09/07 20:36:08 martynas Exp $ */ 2 /* 3 * Copyright (c) 2008 Martynas Venckus <martynas@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <sys/types.h> 19 #include <machine/ieee.h> 20 21 int 22 __isinf(double d) 23 { 24 struct ieee_double *p = (struct ieee_double *)&d; 25 26 return (p->dbl_exp == DBL_EXP_INFNAN && 27 p->dbl_frach == 0 && p->dbl_fracl == 0); 28 } 29 30 int 31 isinff(float f) 32 { 33 struct ieee_single *p = (struct ieee_single *)&f; 34 35 return (p->sng_exp == SNG_EXP_INFNAN && p->sng_frac == 0); 36 } 37