Commit | Line | Data |
---|---|---|
67b5031e MW |
1 | /* -*-c-*- |
2 | * | |
3 | * Mathematical utilities | |
4 | * | |
5 | * (c) 2023 Straylight/Edgeware | |
6 | */ | |
7 | ||
8 | /*----- Licensing notice --------------------------------------------------* | |
9 | * | |
10 | * This file is part of the mLib utilities library. | |
11 | * | |
12 | * mLib is free software: you can redistribute it and/or modify it under | |
13 | * the terms of the GNU Library General Public License as published by | |
14 | * the Free Software Foundation; either version 2 of the License, or (at | |
15 | * your option) any later version. | |
16 | * | |
17 | * mLib is distributed in the hope that it will be useful, but WITHOUT | |
18 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
19 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public | |
20 | * License for more details. | |
21 | * | |
22 | * You should have received a copy of the GNU Library General Public | |
23 | * License along with mLib. If not, write to the Free Software | |
24 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, | |
25 | * USA. | |
26 | */ | |
27 | ||
28 | #ifndef MLIB_MATHS_H | |
29 | #define MLIB_MATHS_H | |
30 | ||
31 | #ifdef __cplusplus | |
32 | extern "C" { | |
33 | #endif | |
34 | ||
35 | /*----- Header files ------------------------------------------------------*/ | |
36 | ||
37 | #include <math.h> | |
38 | ||
39 | /*----- Macros provided ---------------------------------------------------*/ | |
40 | ||
41 | /* --- @NANP@ --- * | |
42 | * | |
43 | * Arguments: @floatish x@ = a floating-point number (evaluated multiple | |
44 | * times) | |
45 | * | |
46 | * Returns: Nonzero if @x@ is not-a-number. | |
47 | */ | |
48 | ||
49 | #ifdef isnan | |
50 | # define NANP(x) isnan(x) | |
51 | #else | |
52 | # define NANP(x) (!((x) == (x))) | |
53 | #endif | |
54 | ||
55 | /* --- @INFP@ --- * | |
56 | * | |
57 | * Arguments: @floatish x@ = a floating-point number (evaluated multiple | |
58 | * times) | |
59 | * | |
60 | * Returns: Nonzero if @x@ is infinite. | |
61 | */ | |
62 | ||
63 | #ifdef isinf | |
64 | # define INFP(x) isinf(x) | |
65 | #else | |
66 | # define INFP(x) ((x) > LDBL_MAX || (x) < -LDBL_MAX) | |
67 | #endif | |
68 | ||
69 | /* --- @NEGP@ --- * | |
70 | * | |
71 | * Arguments: @floatish x@ = a floating-point number (evaluated multiple | |
72 | * times) | |
73 | * | |
74 | * Returns: Nonzero if @x@ is negative. This won't give the right answer | |
75 | * for negative zero unless the system provides explicit | |
76 | * support. | |
77 | */ | |
78 | ||
79 | #ifdef signbit | |
80 | # define NEGP(x) signbit(x) | |
81 | #else | |
82 | # define NEGP(x) ((x) < 0) | |
83 | #endif | |
84 | ||
85 | /*----- That's all, folks -------------------------------------------------*/ | |
86 | ||
87 | #ifdef __cplusplus | |
88 | } | |
89 | #endif | |
90 | ||
91 | #endif |