timer_subr.c revision 224144 
1/*	$FreeBSD: head/usr.sbin/rtadvd/timer_subr.c 224144 2011-07-17 19:24:54Z hrs $	*/
2/*	$KAME: timer.c,v 1.9 2002/06/10 19:59:47 itojun Exp $	*/
3
4/*
5 * Copyright (C) 1998 WIDE Project.
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 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
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 * 3. Neither the name of the project nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/time.h>
34#include <sys/queue.h>
35#include <sys/socket.h>
36#include <syslog.h>
37#include <stdio.h>
38#include <inttypes.h>
39
40#include "timer.h"
41#include "timer_subr.h"
42
43struct timeval *
44rtadvd_timer_rest(struct rtadvd_timer *rat)
45{
46	static struct timeval returnval, now;
47
48	gettimeofday(&now, NULL);
49	if (TIMEVAL_LEQ(&rat->rat_tm, &now)) {
50		syslog(LOG_DEBUG,
51		    "<%s> a timer must be expired, but not yet",
52		    __func__);
53		returnval.tv_sec = returnval.tv_usec = 0;
54	}
55	else
56		TIMEVAL_SUB(&rat->rat_tm, &now, &returnval);
57
58	return (&returnval);
59}
60
61/* result = a + b */
62void
63TIMEVAL_ADD(struct timeval *a, struct timeval *b, struct timeval *result)
64{
65	long l;
66
67	if ((l = a->tv_usec + b->tv_usec) < MILLION) {
68		result->tv_usec = l;
69		result->tv_sec = a->tv_sec + b->tv_sec;
70	}
71	else {
72		result->tv_usec = l - MILLION;
73		result->tv_sec = a->tv_sec + b->tv_sec + 1;
74	}
75}
76
77/*
78 * result = a - b
79 * XXX: this function assumes that a >= b.
80 */
81void
82TIMEVAL_SUB(struct timeval *a, struct timeval *b, struct timeval *result)
83{
84	long l;
85
86	if ((l = a->tv_usec - b->tv_usec) >= 0) {
87		result->tv_usec = l;
88		result->tv_sec = a->tv_sec - b->tv_sec;
89	}
90	else {
91		result->tv_usec = MILLION + l;
92		result->tv_sec = a->tv_sec - b->tv_sec - 1;
93	}
94}
95
96char *
97sec2str(uint32_t s, char *buf)
98{
99	uint32_t day;
100	uint32_t hour;
101	uint32_t min;
102	uint32_t sec;
103	char *p;
104
105	min = s / 60;
106	sec = s % 60;
107
108	hour = min / 60;
109	min = min % 60;
110
111	day = hour / 24;
112	hour = hour % 24;
113
114	p = buf;
115	if (day > 0)
116		p += sprintf(p, "%" PRIu32 "d", day);
117	if (hour > 0)
118		p += sprintf(p, "%" PRIu32 "h", hour);
119	if (min > 0)
120		p += sprintf(p, "%" PRIu32 "m", min);
121
122	if ((p == buf) || (sec > 0 && p > buf))
123		sprintf(p, "%" PRIu32 "s", sec);
124
125	return (buf);
126}
127