1 /* $OpenBSD: signbit.c,v 1.4 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 __signbit(double d) 28 { 29 struct ieee_double *p = (struct ieee_double *)&d; 30 31 return p->dbl_sign; 32 } 33 34 int 35 __signbitf(float f) 36 { 37 struct ieee_single *p = (struct ieee_single *)&f; 38 39 return p->sng_sign; 40 } 41 42 #if LDBL_MANT_DIG == 53 43 #ifdef lint 44 /* PROTOLIB1 */ 45 int __signbitl(long double); 46 #else /* lint */ 47 __weak_alias(__signbitl, __signbit); 48 #endif /* lint */ 49 #endif /* LDBL_MANT_DIG == 53 */ 50