1 /*- 2 * Copyright (c) 2005 David Schultz <das (at) FreeBSD.ORG> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 #include <limits.h> 29 #include <fenv.h> 30 #include <math.h> 31 32 #ifndef type 33 /* __FBSDID("$FreeBSD: src/lib/msun/src/s_lround.c,v 1.2 2005/04/08 00:52:16 das Exp $"); */ 34 #define type double 35 #define roundit round 36 #define dtype long 37 #define DTYPE_MIN LONG_MIN 38 #define DTYPE_MAX LONG_MAX 39 #define fn lround 40 #endif 41 42 /* 43 * If type has more precision than dtype, the endpoints dtype_(min|max) are 44 * of the form xxx.5; they are "out of range" because lround() rounds away 45 * from 0. On the other hand, if type has less precision than dtype, then 46 * all values that are out of range are integral, so we might as well assume 47 * that everything is in range. At compile time, INRANGE(x) should reduce to 48 * two floating-point comparisons in the former case, or TRUE otherwise. 49 */ 50 static const type dtype_min = DTYPE_MIN - 0.5; 51 static const type dtype_max = DTYPE_MAX + 0.5; 52 #define INRANGE(x) (dtype_max - DTYPE_MAX != 0.5 || \ 53 ((x) > dtype_min && (x) < dtype_max)) 54 55 dtype 56 fn(type x) 57 { 58 59 if (INRANGE(x)) { 60 x = roundit(x); 61 return ((dtype)x); 62 } else { 63 feraiseexcept(FE_INVALID); 64 return (DTYPE_MAX); 65 } 66 } 67
