1/*
2 * Copyright (c) 1999 Kungliga Tekniska H�gskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34/*
35 * Timeval stuff
36 */
37
38#ifdef HAVE_CONFIG_H
39#include <config.h>
40RCSID("$Id: timeval.c 14773 2005-04-12 11:29:18Z lha $");
41#endif
42
43#include "roken.h"
44
45/*
46 * Make `t1' consistent.
47 */
48
49void ROKEN_LIB_FUNCTION
50timevalfix(struct timeval *t1)
51{
52    if (t1->tv_usec < 0) {
53        t1->tv_sec--;
54        t1->tv_usec += 1000000;
55    }
56    if (t1->tv_usec >= 1000000) {
57        t1->tv_sec++;
58        t1->tv_usec -= 1000000;
59    }
60}
61
62/*
63 * t1 += t2
64 */
65
66void ROKEN_LIB_FUNCTION
67timevaladd(struct timeval *t1, const struct timeval *t2)
68{
69    t1->tv_sec  += t2->tv_sec;
70    t1->tv_usec += t2->tv_usec;
71    timevalfix(t1);
72}
73
74/*
75 * t1 -= t2
76 */
77
78void ROKEN_LIB_FUNCTION
79timevalsub(struct timeval *t1, const struct timeval *t2)
80{
81    t1->tv_sec  -= t2->tv_sec;
82    t1->tv_usec -= t2->tv_usec;
83    timevalfix(t1);
84}
85