1 /* $OpenBSD: isinf.c,v 1.7 2012/12/05 23:19:59 deraadt 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 /* LINTLIBRARY */ 19 20 #include <sys/types.h> 21 #include <machine/ieee.h> 22 #include <float.h> 23 24 int 25 __isinf(double d) 26 { 27 struct ieee_double *p = (struct ieee_double *)&d; 28 29 return (p->dbl_exp == DBL_EXP_INFNAN && 30 p->dbl_frach == 0 && p->dbl_fracl == 0); 31 } 32 33 int 34 __isinff(float f) 35 { 36 struct ieee_single *p = (struct ieee_single *)&f; 37 38 return (p->sng_exp == SNG_EXP_INFNAN && p->sng_frac == 0); 39 } 40 41 #if LDBL_MANT_DIG == 53 42 #ifdef lint 43 /* PROTOLIB1 */ 44 int __isinfl(long double); 45 #else /* lint */ 46 __weak_alias(__isinfl, __isinf); 47 #endif /* lint */ 48 #endif /* LDBL_MANT_DIG == 53 */ 49 50 /* 51 * 3BSD compatibility aliases. 52 */ 53 __weak_alias(isinf, __isinf); 54 __weak_alias(isinff, __isinff); 55