1 /* $OpenBSD: fpclassify.c,v 1.6 2012/12/05 23:19:59 deraadt 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 <machine/ieee.h> 22 #include <float.h> 23 #include <math.h> 24 25 int 26 __fpclassify(double d) 27 { 28 struct ieee_double *p = (struct ieee_double *)&d; 29 30 if (p->dbl_exp == 0) { 31 if (p->dbl_frach == 0 && p->dbl_fracl == 0) 32 return FP_ZERO; 33 else 34 return FP_SUBNORMAL; 35 } 36 37 if (p->dbl_exp == DBL_EXP_INFNAN) { 38 if (p->dbl_frach == 0 && p->dbl_fracl == 0) 39 return FP_INFINITE; 40 else 41 return FP_NAN; 42 } 43 44 return FP_NORMAL; 45 } 46 47 int 48 __fpclassifyf(float f) 49 { 50 struct ieee_single *p = (struct ieee_single *)&f; 51 52 if (p->sng_exp == 0) { 53 if (p->sng_frac == 0) 54 return FP_ZERO; 55 else 56 return FP_SUBNORMAL; 57 } 58 59 if (p->sng_exp == SNG_EXP_INFNAN) { 60 if (p->sng_frac == 0) 61 return FP_INFINITE; 62 else 63 return FP_NAN; 64 } 65 66 return FP_NORMAL; 67 } 68 69 #if LDBL_MANT_DIG == 53 70 #ifdef lint 71 /* PROTOLIB1 */ 72 int __fpclassifyl(long double); 73 #else /* lint */ 74 __weak_alias(__fpclassifyl, __fpclassify); 75 #endif /* lint */ 76 #endif /* LDBL_MANT_DIG == 53 */ 77