1/*
2 * Copyright (c) 2015 The TCPDUMP project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
15 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
16 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
17 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
18 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
20 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
21 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
24 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
25 * POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef netdissect_timeval_operations_h
29#define netdissect_timeval_operations_h
30
31/* Operations on timevals. */
32
33#define ND_MICRO_PER_SEC 1000000
34#define ND_NANO_PER_SEC 1000000000
35
36#define netdissect_timevalclear(tvp) ((tvp)->tv_sec = (tvp)->tv_usec = 0)
37
38#define netdissect_timevalisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
39
40#define netdissect_timevalcmp(tvp, uvp, cmp)   \
41	(((tvp)->tv_sec == (uvp)->tv_sec) ?    \
42	 ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
43	 ((tvp)->tv_sec cmp (uvp)->tv_sec))
44
45#define netdissect_timevaladd(tvp, uvp, vvp, nano_prec)           \
46	do {                                                      \
47		(vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec;    \
48		(vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
49		if (nano_prec) {                                  \
50			if ((vvp)->tv_usec >= ND_NANO_PER_SEC) {  \
51				(vvp)->tv_sec++;                  \
52				(vvp)->tv_usec -= ND_NANO_PER_SEC; \
53			}                                         \
54		} else {                                          \
55			if ((vvp)->tv_usec >= ND_MICRO_PER_SEC) { \
56				(vvp)->tv_sec++;                  \
57				(vvp)->tv_usec -= ND_MICRO_PER_SEC; \
58			}                                         \
59		}                                                 \
60	} while (0)
61
62#define netdissect_timevalsub(tvp, uvp, vvp, nano_prec)            \
63	do {                                                       \
64		(vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec;     \
65		(vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec;  \
66		if ((vvp)->tv_usec < 0) {                          \
67		    (vvp)->tv_sec--;                               \
68		    (vvp)->tv_usec += (nano_prec ? ND_NANO_PER_SEC : \
69				       ND_MICRO_PER_SEC);          \
70		}                                                  \
71	} while (0)
72
73#endif /* netdissect_timeval_operations_h */
74