Merge from vendor branch BZIP:
[dragonfly.git] / lib / libc / gen / isinff.c
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1/* $NetBSD: isinff_ieee754.c,v 1.1 2004/03/04 23:42:39 kleink Exp $ */
2/* $DragonFly: src/lib/libc/gen/isinff.c,v 1.1 2005/07/26 21:15:19 joerg Exp $ */
3
4/*
5 * Copyright (c) 1992, 1993
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6 * The Regents of the University of California. All rights reserved.
7 *
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8 * This software was developed by the Computer Systems Engineering group
9 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
10 * contributed to Berkeley.
11 *
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12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
b34b60bc 20 * 3. Neither the name of the University nor the names of its contributors
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21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
b34b60bc 36 * from: Header: isinf.c,v 1.1 91/07/08 19:03:34 torek Exp
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37 */
38
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39#include <machine/ieee.h>
40#include <math.h>
984263bc 41
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42/*
43 * 7.12.3.3 isinf - test for infinity
44 * IEEE 754 single-precision version
45 */
984263bc 46int
b34b60bc 47__isinff(float x)
984263bc 48{
b34b60bc 49 union ieee_single_u u;
984263bc 50
b34b60bc 51 u.sngu_f = x;
984263bc 52
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53 return (u.sngu_sng.sng_exp == SNG_EXP_INFNAN &&
54 u.sngu_sng.sng_frac == 0);
984263bc 55}