1/*	$NetBSD: timeval.c,v 1.2 2017/01/28 21:31:50 christos Exp $	*/
2
3/*
4 * Copyright (c) 1999 Kungliga Tekniska H��gskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36/*
37 * Timeval stuff
38 */
39
40#include <config.h>
41
42#include <krb5/roken.h>
43
44/*
45 * Make `t1' consistent.
46 */
47
48ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
49timevalfix(struct timeval *t1)
50{
51    if (t1->tv_usec < 0) {
52        t1->tv_sec--;
53        t1->tv_usec += 1000000;
54    }
55    if (t1->tv_usec >= 1000000) {
56        t1->tv_sec++;
57        t1->tv_usec -= 1000000;
58    }
59}
60
61/*
62 * t1 += t2
63 */
64
65ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
66timevaladd(struct timeval *t1, const struct timeval *t2)
67{
68    t1->tv_sec  += t2->tv_sec;
69    t1->tv_usec += t2->tv_usec;
70    timevalfix(t1);
71}
72
73/*
74 * t1 -= t2
75 */
76
77ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
78timevalsub(struct timeval *t1, const struct timeval *t2)
79{
80    t1->tv_sec  -= t2->tv_sec;
81    t1->tv_usec -= t2->tv_usec;
82    timevalfix(t1);
83}
84