1 /* $OpenBSD: isinf.c,v 1.10 2013/11/12 06:09:48 deraadt Exp $ */
2 /*
3 * Copyright (c) 2008 Martynas Venckus <martynas@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include <sys/types.h>
19 #include <machine/ieee.h>
20 #include <float.h>
21 #include <math.h>
22
23 int
__isinf(double d)24 __isinf(double d)
25 {
26 struct ieee_double *p = (struct ieee_double *)&d;
27
28 return (p->dbl_exp == DBL_EXP_INFNAN &&
29 p->dbl_frach == 0 && p->dbl_fracl == 0);
30 }
31
32 int
__isinff(float f)33 __isinff(float f)
34 {
35 struct ieee_single *p = (struct ieee_single *)&f;
36
37 return (p->sng_exp == SNG_EXP_INFNAN && p->sng_frac == 0);
38 }
39
40 #if LDBL_MANT_DIG == DBL_MANT_DIG
41 __strong_alias(__isinfl, __isinf);
42 #endif /* LDBL_MANT_DIG == DBL_MANT_DIG */
43
44 /*
45 * 3BSD compatibility aliases.
46 */
47 __strong_alias(isinf, __isinf);
48 __strong_alias(isinff, __isinff);
49