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