chiark / gitweb /
Fiddle with CSS+HTML in effort to get more consistent buttons
[disorder] / lib / timeval.h
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1/*
2 * This file is part of DisOrder.
3af7813d 3 * Copyright (C) 2007, 2008 Richard Kettlewell
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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 2 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, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * 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, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
20
21#ifndef TIMEVAL_H
22#define TIMEVAL_H
23
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24#include <time.h>
25
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26static 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
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43static 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
60static inline double tvdouble(const struct timeval a) {
61 return a.tv_sec + a.tv_usec / 1000000.0;
62}
63
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64static inline int64_t tvsub_us(const struct timeval a,
65 const struct timeval b) {
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66 return (((uint64_t)a.tv_sec * 1000000 + a.tv_usec)
67 - ((uint64_t)b.tv_sec * 1000000 + b.tv_usec));
68}
69
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70/** @brief Great-than comparison for timevals */
71static 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 */
82static 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 */
92static 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 */
97static inline int tvle(const struct timeval *a, const struct timeval *b) {
98 return !tvgt(a, b);
99}
100
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101#endif /* TIMEVAL_H */
102
103/*
104Local Variables:
105c-basic-offset:2
106comment-column:40
107fill-column:79
108indent-tabs-mode:nil
109End:
110*/