1 /* $OpenBSD: isinf.c,v 1.4 2008/12/10 01:15:02 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 <sys/cdefs.h> 20 #include <machine/ieee.h> 21 #include <float.h> 22 23 int 24 __isinf(double d) 25 { 26 struct ieee_double *p = (struct ieee_double *)&d; 27 28 return (p->dbl_exp == DBL_EXP_INFNAN && 29 p->dbl_frach == 0 && p->dbl_fracl == 0); 30 } 31 32 int 33 __isinff(float f) 34 { 35 struct ieee_single *p = (struct ieee_single *)&f; 36 37 return (p->sng_exp == SNG_EXP_INFNAN && p->sng_frac == 0); 38 } 39 40 #if LDBL_MANT_DIG == 53 41 #ifdef __weak_alias 42 __weak_alias(__isinfl, __isinf); 43 #endif /* __weak_alias */ 44 #endif /* LDBL_MANT_DIG == 53 */ 45 46 /* 47 * 3BSD compatibility aliases. 48 */ 49 #ifdef __weak_alias 50 __weak_alias(isinf, __isinf); 51 __weak_alias(isinff, __isinff); 52 #endif /* __weak_alias */ 53