73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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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/cdefs.h>
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#include <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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__FBSDID("$FreeBSD$");
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#define type double
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#define roundit round
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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 lround
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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 type_min = (type)DTYPE_MIN;
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static const type type_max = (type)DTYPE_MAX;
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static const type dtype_min = (type)DTYPE_MIN - 0.5;
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static const type dtype_max = (type)DTYPE_MAX + 0.5;
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#define INRANGE(x) (dtype_max - type_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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#ifdef FE_INVALID
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feraiseexcept(FE_INVALID);
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#endif
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return (DTYPE_MAX);
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}
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}
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