libc.a: Add __isnan and __isnanf
[dragonfly.git] / lib / libc / gen / isnan.c
CommitLineData
b34b60bc 1/*-
6ff43c94 2 * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
1a3b704c 3 * All rights reserved.
b34b60bc
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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.
1a3b704c 25 *
6ff43c94 26 * $FreeBSD: head/lib/libc/gen/isnan.c 242894 2012-11-11 13:28:04Z dim $
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27 */
28
29#include <math.h>
b34b60bc 30
6ff43c94 31#include "fpmath.h"
b34b60bc 32
1a3b704c 33/*
6ff43c94
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34 * XXX These routines belong in libm, but they must remain in libc for
35 * binary compat until we can bump libm's major version number.
1a3b704c 36 */
6ff43c94 37
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38__weak_reference(__isnan, isnan);
39__weak_reference(__isnanf, isnanf);
40
41int
42__isnan(double d)
43{
44 union IEEEd2bits u;
45
46 u.d = d;
47 return (u.bits.exp == 2047 && (u.bits.manl != 0 || u.bits.manh != 0));
48}
49
50int
51__isnanf(float f)
b34b60bc 52{
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53 union IEEEf2bits u;
54
55 u.f = f;
56 return (u.bits.exp == 255 && u.bits.man != 0);
b34b60bc 57}