1 /* $OpenBSD: isfinite.c,v 1.8 2013/07/03 04:46:36 espie 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
__isfinite(double d)24 __isfinite(double d)
25 {
26 struct ieee_double *p = (struct ieee_double *)&d;
27
28 return (p->dbl_exp != DBL_EXP_INFNAN);
29 }
30
31 int
__isfinitef(float f)32 __isfinitef(float f)
33 {
34 struct ieee_single *p = (struct ieee_single *)&f;
35
36 return (p->sng_exp != SNG_EXP_INFNAN);
37 }
38
39 #if LDBL_MANT_DIG == DBL_MANT_DIG
40 __strong_alias(__isfinitel, __isfinite);
41 #endif /* LDBL_MANT_DIG == DBL_MANT_DIG */
42
43 /*
44 * 3BSD compatibility aliases.
45 */
46 __strong_alias(finite, __isfinite);
47 __strong_alias(finitef, __isfinitef);
48