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e83d0967 RK |
1 | /* |
2 | * This file is part of DisOrder. | |
5db8461a | 3 | * Copyright (C) 2007-2009, 2013 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 | 24 | #include <time.h> |
19844d4f | 25 | #include <sys/time.h> |
5db8461a | 26 | #include <math.h> |
05b75f8d | 27 | |
e83d0967 RK |
28 | static inline struct timeval tvsub(const struct timeval a, |
29 | const struct timeval b) { | |
30 | struct timeval r; | |
31 | ||
32 | r.tv_sec = a.tv_sec - b.tv_sec; | |
33 | r.tv_usec = a.tv_usec - b.tv_usec; | |
34 | if(r.tv_usec < 0) { | |
35 | r.tv_usec += 1000000; | |
36 | r.tv_sec--; | |
37 | } | |
38 | if(r.tv_usec > 999999) { | |
39 | r.tv_usec -= 1000000; | |
40 | r.tv_sec++; | |
41 | } | |
42 | return r; | |
43 | } | |
44 | ||
81cd1894 RK |
45 | static inline struct timeval tvadd(const struct timeval a, |
46 | const struct timeval b) { | |
47 | struct timeval r; | |
48 | ||
49 | r.tv_sec = a.tv_sec + b.tv_sec; | |
50 | r.tv_usec = a.tv_usec + b.tv_usec; | |
51 | if(r.tv_usec < 0) { | |
52 | r.tv_usec += 1000000; | |
53 | r.tv_sec--; | |
54 | } | |
55 | if(r.tv_usec > 999999) { | |
56 | r.tv_usec -= 1000000; | |
57 | r.tv_sec++; | |
58 | } | |
59 | return r; | |
60 | } | |
61 | ||
62 | static inline double tvdouble(const struct timeval a) { | |
63 | return a.tv_sec + a.tv_usec / 1000000.0; | |
64 | } | |
65 | ||
189e9830 RK |
66 | static inline int64_t tvsub_us(const struct timeval a, |
67 | const struct timeval b) { | |
7aa087a7 RK |
68 | return (((uint64_t)a.tv_sec * 1000000 + a.tv_usec) |
69 | - ((uint64_t)b.tv_sec * 1000000 + b.tv_usec)); | |
70 | } | |
71 | ||
3af7813d RK |
72 | /** @brief Great-than comparison for timevals */ |
73 | static inline int tvgt(const struct timeval *a, const struct timeval *b) { | |
74 | if(a->tv_sec > b->tv_sec) | |
75 | return 1; | |
76 | if(a->tv_sec == b->tv_sec | |
77 | && a->tv_usec > b->tv_usec) | |
78 | return 1; | |
79 | return 0; | |
80 | } | |
81 | ||
82 | /** @brief Less-than | |
83 | comparison for timevals */ | |
84 | static inline int tvlt(const struct timeval *a, const struct timeval *b) { | |
85 | if(a->tv_sec < b->tv_sec) | |
86 | return 1; | |
87 | if(a->tv_sec == b->tv_sec | |
88 | && a->tv_usec < b->tv_usec) | |
89 | return 1; | |
90 | return 0; | |
91 | } | |
92 | ||
93 | /** @brief Greater-than-or-equal comparison for timevals */ | |
94 | static inline int tvge(const struct timeval *a, const struct timeval *b) { | |
95 | return !tvlt(a, b); | |
96 | } | |
97 | ||
98 | /** @brief Less-than-or-equal comparison for timevals */ | |
99 | static inline int tvle(const struct timeval *a, const struct timeval *b) { | |
100 | return !tvgt(a, b); | |
101 | } | |
102 | ||
5db8461a RK |
103 | /** @brief Return the sum of two timespecs */ |
104 | static inline struct timespec tsadd(const struct timespec a, | |
105 | const struct timespec b) { | |
106 | struct timespec r; | |
107 | ||
108 | r.tv_sec = a.tv_sec + b.tv_sec; | |
109 | r.tv_nsec = a.tv_nsec + b.tv_nsec; | |
110 | if(r.tv_nsec < 0) { | |
111 | r.tv_nsec += 1000000; | |
112 | r.tv_sec--; | |
113 | } | |
114 | if(r.tv_nsec > 999999) { | |
115 | r.tv_nsec -= 1000000; | |
116 | r.tv_sec++; | |
117 | } | |
118 | return r; | |
119 | } | |
120 | ||
121 | /** @brief Subtract one timespec from another */ | |
122 | static inline struct timespec tssub(const struct timespec a, | |
123 | const struct timespec b) { | |
124 | struct timespec r; | |
125 | ||
126 | r.tv_sec = a.tv_sec - b.tv_sec; | |
127 | r.tv_nsec = a.tv_nsec - b.tv_nsec; | |
128 | if(r.tv_nsec < 0) { | |
129 | r.tv_nsec += 1000000; | |
130 | r.tv_sec--; | |
131 | } | |
132 | if(r.tv_nsec > 999999) { | |
133 | r.tv_nsec -= 1000000; | |
134 | r.tv_sec++; | |
135 | } | |
136 | return r; | |
137 | } | |
138 | ||
139 | /** @brief Convert a timespec to a double */ | |
140 | static inline double ts_to_double(const struct timespec ts) { | |
141 | return ts.tv_sec + ts.tv_nsec / 1000000000.0; | |
142 | } | |
143 | ||
144 | /** @brief Convert a double to a timespec */ | |
145 | static inline struct timespec double_to_ts(double n) { | |
146 | double i, f; | |
147 | struct timespec r; | |
148 | f = modf(n, &i); | |
149 | r.tv_sec = i; | |
150 | r.tv_nsec = 1000000000 * f; | |
151 | return r; | |
152 | } | |
153 | ||
e83d0967 RK |
154 | #endif /* TIMEVAL_H */ |
155 | ||
156 | /* | |
157 | Local Variables: | |
158 | c-basic-offset:2 | |
159 | comment-column:40 | |
160 | fill-column:79 | |
161 | indent-tabs-mode:nil | |
162 | End: | |
163 | */ |