| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2007, 2008 Richard Kettlewell |
| 4 | * |
| 5 | * This program is free software: you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation, either version 3 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | /** @file lib/timeval.h |
| 19 | * @brief Arithmetic on timeval structures |
| 20 | */ |
| 21 | #ifndef TIMEVAL_H |
| 22 | #define TIMEVAL_H |
| 23 | |
| 24 | #include <time.h> |
| 25 | |
| 26 | static inline struct timeval tvsub(const struct timeval a, |
| 27 | const struct timeval b) { |
| 28 | struct timeval r; |
| 29 | |
| 30 | r.tv_sec = a.tv_sec - b.tv_sec; |
| 31 | r.tv_usec = a.tv_usec - b.tv_usec; |
| 32 | if(r.tv_usec < 0) { |
| 33 | r.tv_usec += 1000000; |
| 34 | r.tv_sec--; |
| 35 | } |
| 36 | if(r.tv_usec > 999999) { |
| 37 | r.tv_usec -= 1000000; |
| 38 | r.tv_sec++; |
| 39 | } |
| 40 | return r; |
| 41 | } |
| 42 | |
| 43 | static inline struct timeval tvadd(const struct timeval a, |
| 44 | const struct timeval b) { |
| 45 | struct timeval r; |
| 46 | |
| 47 | r.tv_sec = a.tv_sec + b.tv_sec; |
| 48 | r.tv_usec = a.tv_usec + b.tv_usec; |
| 49 | if(r.tv_usec < 0) { |
| 50 | r.tv_usec += 1000000; |
| 51 | r.tv_sec--; |
| 52 | } |
| 53 | if(r.tv_usec > 999999) { |
| 54 | r.tv_usec -= 1000000; |
| 55 | r.tv_sec++; |
| 56 | } |
| 57 | return r; |
| 58 | } |
| 59 | |
| 60 | static inline double tvdouble(const struct timeval a) { |
| 61 | return a.tv_sec + a.tv_usec / 1000000.0; |
| 62 | } |
| 63 | |
| 64 | static inline int64_t tvsub_us(const struct timeval a, |
| 65 | const struct timeval b) { |
| 66 | return (((uint64_t)a.tv_sec * 1000000 + a.tv_usec) |
| 67 | - ((uint64_t)b.tv_sec * 1000000 + b.tv_usec)); |
| 68 | } |
| 69 | |
| 70 | /** @brief Great-than comparison for timevals */ |
| 71 | static inline int tvgt(const struct timeval *a, const struct timeval *b) { |
| 72 | if(a->tv_sec > b->tv_sec) |
| 73 | return 1; |
| 74 | if(a->tv_sec == b->tv_sec |
| 75 | && a->tv_usec > b->tv_usec) |
| 76 | return 1; |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | /** @brief Less-than |
| 81 | comparison for timevals */ |
| 82 | static inline int tvlt(const struct timeval *a, const struct timeval *b) { |
| 83 | if(a->tv_sec < b->tv_sec) |
| 84 | return 1; |
| 85 | if(a->tv_sec == b->tv_sec |
| 86 | && a->tv_usec < b->tv_usec) |
| 87 | return 1; |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | /** @brief Greater-than-or-equal comparison for timevals */ |
| 92 | static inline int tvge(const struct timeval *a, const struct timeval *b) { |
| 93 | return !tvlt(a, b); |
| 94 | } |
| 95 | |
| 96 | /** @brief Less-than-or-equal comparison for timevals */ |
| 97 | static inline int tvle(const struct timeval *a, const struct timeval *b) { |
| 98 | return !tvgt(a, b); |
| 99 | } |
| 100 | |
| 101 | #endif /* TIMEVAL_H */ |
| 102 | |
| 103 | /* |
| 104 | Local Variables: |
| 105 | c-basic-offset:2 |
| 106 | comment-column:40 |
| 107 | fill-column:79 |
| 108 | indent-tabs-mode:nil |
| 109 | End: |
| 110 | */ |