1 /* $OpenBSD: isfinite.c,v 1.5 2011/05/30 17:28:15 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 /* LINTLIBRARY */ 19 20 #include <sys/types.h> 21 #include <sys/cdefs.h> 22 #include <machine/ieee.h> 23 #include <float.h> 24 #include <math.h> 25 26 int 27 __isfinite(double d) 28 { 29 struct ieee_double *p = (struct ieee_double *)&d; 30 31 return (p->dbl_exp != DBL_EXP_INFNAN); 32 } 33 34 int 35 __isfinitef(float f) 36 { 37 struct ieee_single *p = (struct ieee_single *)&f; 38 39 return (p->sng_exp != SNG_EXP_INFNAN); 40 } 41 42 #if LDBL_MANT_DIG == 53 43 #ifdef lint 44 /* PROTOLIB1 */ 45 int __isfinitel(long double); 46 #else /* lint */ 47 __weak_alias(__isfinitel, __isfinite); 48 #endif /* lint */ 49 #endif /* LDBL_MANT_DIG == 53 */ 50 51 /* 52 * 3BSD compatibility aliases. 53 */ 54 __weak_alias(finite, __isfinite); 55 __weak_alias(finitef, __isfinitef); 56