1 /* $OpenBSD: fpclassify.c,v 1.2 2008/09/07 20:36:08 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 <machine/ieee.h> 20 #include <math.h> 21 22 int 23 __fpclassify(double d) 24 { 25 struct ieee_double *p = (struct ieee_double *)&d; 26 27 if (p->dbl_exp == 0) { 28 if (p->dbl_frach == 0 && p->dbl_fracl == 0) 29 return FP_ZERO; 30 else 31 return FP_SUBNORMAL; 32 } 33 34 if (p->dbl_exp == DBL_EXP_INFNAN) { 35 if (p->dbl_frach == 0 && p->dbl_fracl == 0) 36 return FP_INFINITE; 37 else 38 return FP_NAN; 39 } 40 41 return FP_NORMAL; 42 } 43 44 int 45 __fpclassifyf(float f) 46 { 47 struct ieee_single *p = (struct ieee_single *)&f; 48 49 if (p->sng_exp == 0) { 50 if (p->sng_frac == 0) 51 return FP_ZERO; 52 else 53 return FP_SUBNORMAL; 54 } 55 56 if (p->sng_exp == SNG_EXP_INFNAN) { 57 if (p->sng_frac == 0) 58 return FP_INFINITE; 59 else 60 return FP_NAN; 61 } 62 63 return FP_NORMAL; 64 } 65