1 /* $OpenBSD: fpclassify.c,v 1.8 2013/07/03 04:46:36 espie 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 <float.h> 21 #include <math.h> 22 23 int 24 __fpclassify(double d) 25 { 26 struct ieee_double *p = (struct ieee_double *)&d; 27 28 if (p->dbl_exp == 0) { 29 if (p->dbl_frach == 0 && p->dbl_fracl == 0) 30 return FP_ZERO; 31 else 32 return FP_SUBNORMAL; 33 } 34 35 if (p->dbl_exp == DBL_EXP_INFNAN) { 36 if (p->dbl_frach == 0 && p->dbl_fracl == 0) 37 return FP_INFINITE; 38 else 39 return FP_NAN; 40 } 41 42 return FP_NORMAL; 43 } 44 45 int 46 __fpclassifyf(float f) 47 { 48 struct ieee_single *p = (struct ieee_single *)&f; 49 50 if (p->sng_exp == 0) { 51 if (p->sng_frac == 0) 52 return FP_ZERO; 53 else 54 return FP_SUBNORMAL; 55 } 56 57 if (p->sng_exp == SNG_EXP_INFNAN) { 58 if (p->sng_frac == 0) 59 return FP_INFINITE; 60 else 61 return FP_NAN; 62 } 63 64 return FP_NORMAL; 65 } 66 67 #if LDBL_MANT_DIG == DBL_MANT_DIG 68 __strong_alias(__fpclassifyl, __fpclassify); 69 #endif /* LDBL_MANT_DIG == DBL_MANT_DIG */ 70