chiark / gitweb /
Merge from disorder.dev.
[disorder] / lib / timeval.h
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1/*
2 * This file is part of DisOrder.
4778e044 3 * Copyright (C) 2007-2009 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.
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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 */
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18/** @file lib/timeval.h
19 * @brief Arithmetic on timeval structures
20 */
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21#ifndef TIMEVAL_H
22#define TIMEVAL_H
23
05b75f8d 24#include <time.h>
19844d4f 25#include <sys/time.h>
05b75f8d 26
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27static inline struct timeval tvsub(const struct timeval a,
28 const struct timeval b) {
29 struct timeval r;
30
31 r.tv_sec = a.tv_sec - b.tv_sec;
32 r.tv_usec = a.tv_usec - b.tv_usec;
33 if(r.tv_usec < 0) {
34 r.tv_usec += 1000000;
35 r.tv_sec--;
36 }
37 if(r.tv_usec > 999999) {
38 r.tv_usec -= 1000000;
39 r.tv_sec++;
40 }
41 return r;
42}
43
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44static inline struct timeval tvadd(const struct timeval a,
45 const struct timeval b) {
46 struct timeval r;
47
48 r.tv_sec = a.tv_sec + b.tv_sec;
49 r.tv_usec = a.tv_usec + b.tv_usec;
50 if(r.tv_usec < 0) {
51 r.tv_usec += 1000000;
52 r.tv_sec--;
53 }
54 if(r.tv_usec > 999999) {
55 r.tv_usec -= 1000000;
56 r.tv_sec++;
57 }
58 return r;
59}
60
61static inline double tvdouble(const struct timeval a) {
62 return a.tv_sec + a.tv_usec / 1000000.0;
63}
64
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65static inline int64_t tvsub_us(const struct timeval a,
66 const struct timeval b) {
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67 return (((uint64_t)a.tv_sec * 1000000 + a.tv_usec)
68 - ((uint64_t)b.tv_sec * 1000000 + b.tv_usec));
69}
70
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71/** @brief Great-than comparison for timevals */
72static inline int tvgt(const struct timeval *a, const struct timeval *b) {
73 if(a->tv_sec > b->tv_sec)
74 return 1;
75 if(a->tv_sec == b->tv_sec
76 && a->tv_usec > b->tv_usec)
77 return 1;
78 return 0;
79}
80
81/** @brief Less-than
82 comparison for timevals */
83static inline int tvlt(const struct timeval *a, const struct timeval *b) {
84 if(a->tv_sec < b->tv_sec)
85 return 1;
86 if(a->tv_sec == b->tv_sec
87 && a->tv_usec < b->tv_usec)
88 return 1;
89 return 0;
90}
91
92/** @brief Greater-than-or-equal comparison for timevals */
93static inline int tvge(const struct timeval *a, const struct timeval *b) {
94 return !tvlt(a, b);
95}
96
97/** @brief Less-than-or-equal comparison for timevals */
98static inline int tvle(const struct timeval *a, const struct timeval *b) {
99 return !tvgt(a, b);
100}
101
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102#endif /* TIMEVAL_H */
103
104/*
105Local Variables:
106c-basic-offset:2
107comment-column:40
108fill-column:79
109indent-tabs-mode:nil
110End:
111*/