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/* $OpenBSD: s_lroundl.c,v 1.2 2012/12/05 23:20:04 deraadt Exp $ */ |
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/*- |
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* Copyright (c) 2005 David Schultz <das@FreeBSD.ORG> |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include <sys/limits.h> |
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#include <fenv.h> |
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#include <math.h> |
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#ifndef type |
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#if 0 |
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__FBSDID("$FreeBSD: src/lib/msun/src/s_lround.c,v 1.2 2005/04/08 00:52:16 das Exp $"); |
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#endif |
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#define type long double |
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#define roundit roundl |
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#define dtype long |
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#define DTYPE_MIN LONG_MIN |
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#define DTYPE_MAX LONG_MAX |
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#define fn lroundl |
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#endif |
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/* |
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* If type has more precision than dtype, the endpoints dtype_(min|max) are |
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* of the form xxx.5; they are "out of range" because lround() rounds away |
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* from 0. On the other hand, if type has less precision than dtype, then |
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* all values that are out of range are integral, so we might as well assume |
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* that everything is in range. At compile time, INRANGE(x) should reduce to |
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* two floating-point comparisons in the former case, or TRUE otherwise. |
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*/ |
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static const type dtype_min = DTYPE_MIN - 0.5; |
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static const type dtype_max = DTYPE_MAX + 0.5; |
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#define INRANGE(x) (dtype_max - DTYPE_MAX != 0.5 || \ |
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((x) > dtype_min && (x) < dtype_max)) |
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dtype |
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fn(type x) |
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{ |
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if (INRANGE(x)) { |
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x = roundit(x); |
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return ((dtype)x); |
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} else { |
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feraiseexcept(FE_INVALID); |
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return (DTYPE_MAX); |
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} |
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} |