07b064e02e
Some of the stuff (e.g., rarpd, bootpd, dhcpd etc., libsa) still will only support Ethernet. Tcpdump itself should be ok, but libpcap needs lot of work. For the detailed change history, look at the commit log entries for the is-newarp branch.
169 lines
4.6 KiB
C
169 lines
4.6 KiB
C
/* $NetBSD: clock_subr.c,v 1.3 1997/03/15 18:11:16 is Exp $ */
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/*
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1982, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: Utah $Hdr: clock.c 1.18 91/01/21$
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*
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* @(#)clock.c 8.2 (Berkeley) 1/12/94
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*/
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/*
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* Generic routines to convert between a POSIX date
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* (seconds since 1/1/1970) and yr/mo/day/hr/min/sec
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* Derived from arch/hp300/hp300/clock.c
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*/
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#include <sys/types.h>
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#include <sys/systm.h>
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#include <dev/clock_subr.h>
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/* Traditional POSIX base year */
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#define POSIX_BASE_YEAR 1970
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static inline int leapyear __P((int year));
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#define FEBRUARY 2
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#define days_in_year(a) (leapyear(a) ? 366 : 365)
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#define days_in_month(a) (month_days[(a) - 1])
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static const int month_days[12] = {
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31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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};
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/*
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* This inline avoids some unnecessary modulo operations
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* as compared with the usual macro:
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* ( ((year % 4) == 0 &&
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* (year % 100) != 0) ||
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* ((year % 400) == 0) )
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* It is otherwise equivalent.
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*/
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static inline int
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leapyear(year)
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int year;
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{
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int rv = 0;
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if ((year & 3) == 0) {
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rv = 1;
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if ((year % 100) == 0) {
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rv = 0;
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if ((year % 400) == 0)
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rv = 1;
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}
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}
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return (rv);
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}
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time_t
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clock_ymdhms_to_secs(dt)
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struct clock_ymdhms *dt;
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{
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time_t secs;
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int i, year, days;
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year = dt->dt_year;
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/*
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* Compute days since start of time
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* First from years, then from months.
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*/
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days = 0;
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for (i = POSIX_BASE_YEAR; i < year; i++)
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days += days_in_year(i);
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if (leapyear(year) && dt->dt_mon > FEBRUARY)
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days++;
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/* Months */
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for (i = 1; i < dt->dt_mon; i++)
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days += days_in_month(i);
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days += (dt->dt_day - 1);
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/* Add hours, minutes, seconds. */
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secs = ((days
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* 24 + dt->dt_hour)
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* 60 + dt->dt_min)
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* 60 + dt->dt_sec;
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return (secs);
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}
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/* This function uses a copy of month_days[] */
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#undef days_in_month
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#define days_in_month(a) (mthdays[(a) - 1])
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void
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clock_secs_to_ymdhms(secs, dt)
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time_t secs;
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struct clock_ymdhms *dt;
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{
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int mthdays[12];
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int i, days;
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int rsec; /* remainder seconds */
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bcopy(month_days, mthdays, sizeof(mthdays));
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days = secs / SECDAY;
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rsec = secs % SECDAY;
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/* Day of week (Note: 1/1/1970 was a Thursday) */
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dt->dt_wday = (days + 4) % 7;
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/* Subtract out whole years, counting them in i. */
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for (i = POSIX_BASE_YEAR; days >= days_in_year(i); i++)
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days -= days_in_year(i);
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dt->dt_year = i;
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/* Subtract out whole months, counting them in i. */
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if (leapyear(i))
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days_in_month(FEBRUARY) = 29;
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for (i = 1; days >= days_in_month(i); i++)
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days -= days_in_month(i);
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dt->dt_mon = i;
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/* Days are what is left over (+1) from all that. */
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dt->dt_day = days + 1;
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/* Hours, minutes, seconds are easy */
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dt->dt_hour = rsec / 3600;
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rsec = rsec % 3600;
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dt->dt_min = rsec / 60;
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rsec = rsec % 60;
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dt->dt_sec = rsec;
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}
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