~mdw / mLib / blame
| 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 | ||
| b1a20bee MW |
39 | #ifndef MLIB_BITS_H |
| 40 | # include "bits.h" | |
| 41 | #endif | |
| 42 | ||
| 67b5031e MW |
43 | /*----- Macros provided ---------------------------------------------------*/ |
| 44 | ||
| 45 | /* --- @NANP@ --- * | |
| 46 | * | |
| 47 | * Arguments: @floatish x@ = a floating-point number (evaluated multiple | |
| 48 | * times) | |
| 49 | * | |
| 50 | * Returns: Nonzero if @x@ is not-a-number. | |
| 51 | */ | |
| 52 | ||
| 53 | #ifdef isnan | |
| 54 | # define NANP(x) isnan(x) | |
| 55 | #else | |
| 56 | # define NANP(x) (!((x) == (x))) | |
| 57 | #endif | |
| 58 | ||
| 59 | /* --- @INFP@ --- * | |
| 60 | * | |
| 61 | * Arguments: @floatish x@ = a floating-point number (evaluated multiple | |
| 62 | * times) | |
| 63 | * | |
| 64 | * Returns: Nonzero if @x@ is infinite. | |
| 65 | */ | |
| 66 | ||
| 67 | #ifdef isinf | |
| 68 | # define INFP(x) isinf(x) | |
| 69 | #else | |
| 70 | # define INFP(x) ((x) > LDBL_MAX || (x) < -LDBL_MAX) | |
| 71 | #endif | |
| 72 | ||
| 73 | /* --- @NEGP@ --- * | |
| 74 | * | |
| 75 | * Arguments: @floatish x@ = a floating-point number (evaluated multiple | |
| 76 | * times) | |
| 77 | * | |
| 78 | * Returns: Nonzero if @x@ is negative. This won't give the right answer | |
| 79 | * for negative zero unless the system provides explicit | |
| 80 | * support. | |
| 81 | */ | |
| 82 | ||
| 83 | #ifdef signbit | |
| 84 | # define NEGP(x) signbit(x) | |
| 85 | #else | |
| 86 | # define NEGP(x) ((x) < 0) | |
| 87 | #endif | |
| 88 | ||
| b1a20bee MW |
89 | /*----- Floating-point encoding and decoding ------------------------------*/ |
| 90 | ||
| 67b5031e MW |
91 | /*----- That's all, folks -------------------------------------------------*/ |
| 92 | ||
| 93 | #ifdef __cplusplus | |
| 94 | } | |
| 95 | #endif | |
| 96 | ||
| 97 | #endif |