1 /* $OpenBSD: fpclassify.c,v 1.4 2008/12/10 01:15:02 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 <sys/cdefs.h> 20 #include <machine/ieee.h> 21 #include <float.h> 22 #include <math.h> 23 24 int 25 __fpclassify(double d) 26 { 27 struct ieee_double *p = (struct ieee_double *)&d; 28 29 if (p->dbl_exp == 0) { 30 if (p->dbl_frach == 0 && p->dbl_fracl == 0) 31 return FP_ZERO; 32 else 33 return FP_SUBNORMAL; 34 } 35 36 if (p->dbl_exp == DBL_EXP_INFNAN) { 37 if (p->dbl_frach == 0 && p->dbl_fracl == 0) 38 return FP_INFINITE; 39 else 40 return FP_NAN; 41 } 42 43 return FP_NORMAL; 44 } 45 46 int 47 __fpclassifyf(float f) 48 { 49 struct ieee_single *p = (struct ieee_single *)&f; 50 51 if (p->sng_exp == 0) { 52 if (p->sng_frac == 0) 53 return FP_ZERO; 54 else 55 return FP_SUBNORMAL; 56 } 57 58 if (p->sng_exp == SNG_EXP_INFNAN) { 59 if (p->sng_frac == 0) 60 return FP_INFINITE; 61 else 62 return FP_NAN; 63 } 64 65 return FP_NORMAL; 66 } 67 68 #if LDBL_MANT_DIG == 53 69 #ifdef __weak_alias 70 __weak_alias(__fpclassifyl, __fpclassify); 71 #endif /* __weak_alias */ 72 #endif /* LDBL_MANT_DIG == 53 */ 73