1 /*-
2 * Copyright (c) 2005 David Schultz <das@FreeBSD.ORG>
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, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include "namespace.h"
28
29 #include <sys/cdefs.h>
30 #include <limits.h>
31 #include <fenv.h>
32 #include <math.h>
33
34 #ifndef stype
35 #ifdef __FreeBSD__
36 __FBSDID("$FreeBSD: head/lib/msun/src/s_lround.c 144770 2005-04-08 00:52:16Z das $");
37 #else
38 __RCSID("$NetBSD: s_lround.c,v 1.1 2017/05/06 18:03:24 christos Exp $");
39 #endif
40 #define stype double
41 #define roundit round
42 #define dtype long
43 #define DTYPE_MIN LONG_MIN
44 #define DTYPE_MAX LONG_MAX
45 #define fn lround
46 #endif
47
48 /*
49 * If stype has more precision than dtype, the endpoints dtype_(min|max) are
50 * of the form xxx.5; they are "out of range" because lround() rounds away
51 * from 0. On the other hand, if stype has less precision than dtype, then
52 * all values that are out of range are integral, so we might as well assume
53 * that everything is in range. At compile time, INRANGE(x) should reduce to
54 * two floating-point comparisons in the former case, or TRUE otherwise.
55 */
56 static const stype dtype_min = DTYPE_MIN - 0.5;
57 static const stype dtype_max = DTYPE_MAX + 0.5;
58 #define INRANGE(x) (dtype_max - DTYPE_MAX != 0.5 || \
59 ((x) > dtype_min && (x) < dtype_max))
60
61 dtype
fn(stype x)62 fn(stype x)
63 {
64
65 if (INRANGE(x)) {
66 x = roundit(x);
67 return ((dtype)x);
68 } else {
69 feraiseexcept(FE_INVALID);
70 return (DTYPE_MAX);
71 }
72 }
73