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