xref: /openbsd-src/lib/libc/gen/isinf.c (revision a28daedfc357b214be5c701aa8ba8adb29a7f1c2)
1 /*	$OpenBSD: isinf.c,v 1.4 2008/12/10 01:15:02 martynas 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 <sys/cdefs.h>
20 #include <machine/ieee.h>
21 #include <float.h>
22 
23 int
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
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 == 53
41 #ifdef __weak_alias
42 __weak_alias(__isinfl, __isinf);
43 #endif /* __weak_alias */
44 #endif /* LDBL_MANT_DIG == 53 */
45 
46 /*
47  * 3BSD compatibility aliases.
48  */
49 #ifdef __weak_alias
50 __weak_alias(isinf, __isinf);
51 __weak_alias(isinff, __isinff);
52 #endif /* __weak_alias */
53