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mathconf.h
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 /*
3 * This file is part of the LibreOffice project.
4 *
5 * This Source Code Form is subject to the terms of the Mozilla Public
6 * License, v. 2.0. If a copy of the MPL was not distributed with this
7 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 *
9 * This file incorporates work covered by the following license notice:
10 *
11 * Licensed to the Apache Software Foundation (ASF) under one or more
12 * contributor license agreements. See the NOTICE file distributed
13 * with this work for additional information regarding copyright
14 * ownership. The ASF licenses this file to you under the Apache
15 * License, Version 2.0 (the "License"); you may not use this file
16 * except in compliance with the License. You may obtain a copy of
17 * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 */
19
20 #ifndef INCLUDED_SAL_MATHCONF_H
21 #define INCLUDED_SAL_MATHCONF_H
22
23 #include "osl/endian.h"
24
25 #include <float.h>
26
27 #if defined SOLARIS
28 #include <ieeefp.h>
29 #endif /* SOLARIS */
30
31 #if defined(__cplusplus) && ( defined(__GXX_EXPERIMENTAL_CXX0X__) || __cplusplus >= 201103L )
32 #include <cmath>
33 #endif
34
35 #if defined(IOS)
36 #if defined(__cplusplus)
37 #include <cmath>
38 #else
39 #include <math.h>
40 #endif
41 #endif
42
43 #if defined __cplusplus
44 extern "C" {
45 #endif /* __cplusplus */
46
47
48 /* Generally, the C standard guarantees that at program startup, "trapping or
49 stopping (if supported) is disabled on all [floating-point] exceptions"
50 (F.7.3/1 of the August 3, 1998 draft of C99), and that during program
51 execution, "a programmer can safely assume default modes (or be unaware of
52 them)" (7.6/2, footnote 161 of the August 3, 1998 draft of C99). Reportedly,
53 on Windows there are printer drivers that switch on exceptions. To avoid
54 problems, the SAL_MATH_FPEXCEPTIONS_OFF macro can be used to explicitly
55 switch off exceptions (on Windows).
56 */
57 #if defined WNT
58 #define SAL_MATH_FPEXCEPTIONS_OFF() _control87( _MCW_EM, _MCW_EM )
59 #else /* WNT */
60 #define SAL_MATH_FPEXCEPTIONS_OFF()
61 #endif /* WNT */
62
63
64 /* SAL_MATH_FINITE(d): test double d on INFINITY, NaN et al. */
65 #if !defined SOLARIS && !defined ANDROID \
66 && defined(__cplusplus) \
67 && ( defined(__GXX_EXPERIMENTAL_CXX0X__) \
68 || __cplusplus >= 201103L \
69 || defined(IOS) )
70 #define SAL_MATH_FINITE(d) std::isfinite(d)
71 #elif defined( IOS )
72 #define SAL_MATH_FINITE(d) isfinite(d)
73 #elif defined( WNT)
74 #define SAL_MATH_FINITE(d) _finite(d)
75 #elif defined LINUX || defined UNX
76 #define SAL_MATH_FINITE(d) finite(d)
77 #else /* WNT, LINUX, UNX */
78 #error "SAL_MATH_FINITE not defined"
79 #endif /* WNT, LINUX, UNX */
80
81
82 /* This needs to be fixed for non--IEEE-754 platforms: */
83 #if 1 /* IEEE 754 supported */
84 #if defined OSL_BIGENDIAN
85
86 /* IEEE 754 double structures for BigEndian */
87 union sal_math_Double
88 {
89 struct
90 {
91 unsigned sign : 1;
92 unsigned exponent :11;
93 unsigned fraction_hi :20;
94 unsigned fraction_lo :32;
95 } inf_parts;
96 struct
97 {
98 unsigned sign : 1;
99 unsigned exponent :11;
100 unsigned qnan_bit : 1;
101 unsigned bits :19;
102 unsigned fraction_lo :32;
103 } nan_parts;
104 struct
105 {
106 unsigned msw :32;
107 unsigned lsw :32;
108 } w32_parts;
109 double value;
110 };
111
112 #elif defined OSL_LITENDIAN
113
114 /* IEEE 754 double structures for LittleEndian */
115 union sal_math_Double
116 {
117 struct {
118 unsigned fraction_lo :32;
119 unsigned fraction_hi :20;
120 unsigned exponent :11;
121 unsigned sign : 1;
122 } inf_parts;
123 struct {
124 unsigned fraction_lo :32;
125 unsigned bits :19;
126 unsigned qnan_bit : 1;
127 unsigned exponent :11;
128 unsigned sign : 1;
129 } nan_parts;
130 struct
131 {
132 unsigned lsw :32;
133 unsigned msw :32;
134 } w32_parts;
135 double value;
136 };
137
138 #else /* OSL_BIGENDIAN, OSL_LITENDIAN */
139
140 #error "neither OSL_BIGENDIAN nor OSL_LITENDIAN"
141
142 #endif /* OSL_BIGENDIAN, OSL_LITENDIAN */
143 #else /* IEEE 754 supported */
144
145 #error "don't know how to handle IEEE 754"
146
147 #endif /* IEEE 754 supported */
148
149
150 #if defined __cplusplus
151 }
152 #endif /* __cplusplus */
153
154 #endif /* INCLUDED_SAL_MATHCONF_H */
155
156 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
math.h
endian.h