1 /* $OpenBSD: fpclassify.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 __fpclassify(double d) 28 { 29 struct ieee_double *p = (struct ieee_double *)&d; 30 31 if (p->dbl_exp == 0) { 32 if (p->dbl_frach == 0 && p->dbl_fracl == 0) 33 return FP_ZERO; 34 else 35 return FP_SUBNORMAL; 36 } 37 38 if (p->dbl_exp == DBL_EXP_INFNAN) { 39 if (p->dbl_frach == 0 && p->dbl_fracl == 0) 40 return FP_INFINITE; 41 else 42 return FP_NAN; 43 } 44 45 return FP_NORMAL; 46 } 47 48 int 49 __fpclassifyf(float f) 50 { 51 struct ieee_single *p = (struct ieee_single *)&f; 52 53 if (p->sng_exp == 0) { 54 if (p->sng_frac == 0) 55 return FP_ZERO; 56 else 57 return FP_SUBNORMAL; 58 } 59 60 if (p->sng_exp == SNG_EXP_INFNAN) { 61 if (p->sng_frac == 0) 62 return FP_INFINITE; 63 else 64 return FP_NAN; 65 } 66 67 return FP_NORMAL; 68 } 69 70 #if LDBL_MANT_DIG == 53 71 #ifdef lint 72 /* PROTOLIB1 */ 73 int __fpclassifyl(long double); 74 #else /* lint */ 75 __weak_alias(__fpclassifyl, __fpclassify); 76 #endif /* lint */ 77 #endif /* LDBL_MANT_DIG == 53 */ 78