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e83d0967 RK |
1 | /* |
2 | * This file is part of DisOrder. | |
3af7813d | 3 | * Copyright (C) 2007, 2008 Richard Kettlewell |
e83d0967 | 4 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
e83d0967 | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
e83d0967 | 8 | * (at your option) any later version. |
e7eb3a27 RK |
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 | * | |
e83d0967 | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
e83d0967 | 17 | */ |
132a5a4a RK |
18 | /** @file lib/timeval.h |
19 | * @brief Arithmetic on timeval structures | |
20 | */ | |
e83d0967 RK |
21 | #ifndef TIMEVAL_H |
22 | #define TIMEVAL_H | |
23 | ||
05b75f8d RK |
24 | #include <time.h> |
25 | ||
e83d0967 RK |
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 | ||
81cd1894 RK |
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 | ||
189e9830 RK |
64 | static inline int64_t tvsub_us(const struct timeval a, |
65 | const struct timeval b) { | |
7aa087a7 RK |
66 | return (((uint64_t)a.tv_sec * 1000000 + a.tv_usec) |
67 | - ((uint64_t)b.tv_sec * 1000000 + b.tv_usec)); | |
68 | } | |
69 | ||
3af7813d RK |
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 | ||
e83d0967 RK |
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 | */ |