1/*	$OpenBSD: isnan.c,v 1.9 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
23int
24__isnan(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
32int
33__isnanf(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(__isnanl, __isnan);
42#endif	/* LDBL_MANT_DIG == DBL_MANT_DIG */
43
44/*
45 * 3BSD compatibility aliases.
46 */
47__strong_alias(isnan, __isnan);
48__strong_alias(isnanf, __isnanf);
49