1 /*-
2 * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
3 * All rights reserved.
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.
25 *
26 * $FreeBSD: head/lib/libc/gen/isinf.c 131898 2004-07-10 15:52:26Z marcel $
27 */
28
29 #include <math.h>
30
31 #include "fpmath.h"
32
33 /*
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.
36 */
37
38 int
__isinf(double d)39 __isinf(double d)
40 {
41 union IEEEd2bits u;
42
43 u.d = d;
44 return (u.bits.exp == 2047 && u.bits.manl == 0 && u.bits.manh == 0);
45 }
46
47 __weak_reference(__isinf, isinf);
48
49 int
__isinff(float f)50 __isinff(float f)
51 {
52 union IEEEf2bits u;
53
54 u.f = f;
55 return (u.bits.exp == 255 && u.bits.man == 0);
56 }
57
58 int
__isinfl(long double e)59 __isinfl(long double e)
60 {
61 union IEEEl2bits u;
62
63 u.e = e;
64 mask_nbit_l(u);
65 return (u.bits.exp == 32767 && u.bits.manl == 0 && u.bits.manh == 0);
66 }
67