1/*-
2 * Copyright (c) 2003, Steven G. Kargl
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 unmodified, this list of conditions, and the following
10 *    disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__RCSID("$NetBSD$");
29#if 0
30__FBSDID("$FreeBSD: head/lib/msun/src/s_roundl.c 153017 2005-12-02 13:45:06Z bde $");
31#endif
32
33#include "namespace.h"
34#include <math.h>
35
36#ifdef __HAVE_LONG_DOUBLE
37
38#ifdef __weak_alias
39__weak_alias(roundl, _roundl)
40#endif
41
42long double
43roundl(long double x)
44{
45	long double t;
46
47	if (!isfinite(x))
48		return (x);
49
50	if (x >= 0.0) {
51		t = floorl(x);
52		if (t - x <= -0.5)
53			t += 1.0;
54		return (t);
55	} else {
56		t = floorl(-x);
57		if (t + x <= -0.5)
58			t += 1.0;
59		return (-t);
60	}
61}
62
63#endif /* __HAVE_LONG_DOUBLE */
64