1 /*- 2 * Copyright (c) 2005 David Schultz <das@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 "cdefs-compat.h" 28 29 #include <limits.h> 30 #include <openlibm_fenv.h> 31 #include <openlibm_math.h> 32 33 #include "math_private.h" 34 35 #ifndef type 36 //__FBSDID("$FreeBSD: src/lib/msun/src/s_lround.c,v 1.2 2005/04/08 00:52:16 das Exp $"); 37 #define type double 38 #define roundit round 39 #define dtype long 40 #define DTYPE_MIN LONG_MIN 41 #define DTYPE_MAX LONG_MAX 42 #define fn lround 43 #endif 44 45 /* 46 * If type has more precision than dtype, the endpoints dtype_(min|max) are 47 * of the form xxx.5; they are "out of range" because lround() rounds away 48 * from 0. On the other hand, if type has less precision than dtype, then 49 * all values that are out of range are integral, so we might as well assume 50 * that everything is in range. At compile time, INRANGE(x) should reduce to 51 * two floating-point comparisons in the former case, or TRUE otherwise. 52 */ 53 static const type dtype_min = DTYPE_MIN - 0.5; 54 static const type dtype_max = DTYPE_MAX + 0.5; 55 #define INRANGE(x) (dtype_max - DTYPE_MAX != 0.5 || \ 56 ((x) > dtype_min && (x) < dtype_max)) 57 58 DLLEXPORT dtype 59 fn(type x) 60 { 61 62 if (INRANGE(x)) { 63 x = roundit(x); 64 return ((dtype)x); 65 } else { 66 feraiseexcept(FE_INVALID); 67 return (DTYPE_MAX); 68 } 69 } 70