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/* $OpenBSD: time.c,v 1.3 1997/05/31 15:36:41 mickey Exp $ */
/*
* Copyright (c) 1997 Tobias Weingartner
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Tobias Weingartner.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <libsa.h>
#include <sys/time.h>
#include "biosdev.h"
#define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
/*
* Convert from bcd (packed) to int
*/
static int bcdtoint(char c){
int tens;
int ones;
tens = (c & 0xf0) >> 4;
tens *= 10;
ones = c & 0x0f;
return (tens + ones);
}
/* Number of days per month */
static int monthcount[] = {
31, 28, 31, 30, 31, 30, 31,
31, 30, 31, 30, 31, 30, 31
};
/*
* Quick compute of time in seconds since the Epoch
*/
static time_t
compute(int year, int month, int day, int hour, int min, int sec){
int yearsec, daysec, timesec;
int i;
/* Compute years of seconds */
yearsec = year - 1970;
yearsec *= (365 * 24 * 60 * 60);
/* Compute days of seconds */
daysec = 0;
for(i = 1; i < month; i++){
daysec += monthcount[i];
}
daysec += day;
/* Compute for leap year */
for(i = 1970; i < year; i++){
if(isleap(i))
daysec += 1;
}
daysec *= (24 * 60 * 60);
/* Plus the time */
timesec = sec;
timesec += (min * 60);
timesec += (hour * 60 * 60);
/* Return sum */
return (yearsec + daysec + timesec);
}
/*
* Return time since epoch
*/
time_t getsecs(void){
char timebuf[4], datebuf[4];
int st1, st2;
time_t tt = 0;
/* Query BIOS for time & date */
st1 = biostime(timebuf);
st2 = biosdate(datebuf);
/* Convert to seconds since Epoch */
if(!st1 && !st2){
int year, month, day;
int hour, min, sec;
int dst;
dst = bcdtoint(timebuf[3]);
sec = bcdtoint(timebuf[2]);
min = bcdtoint(timebuf[1]);
hour = bcdtoint(timebuf[0]);
year = bcdtoint(datebuf[0]);
year *= 100;
year += bcdtoint(datebuf[1]);
month = bcdtoint(datebuf[2]);
day = bcdtoint(datebuf[3]);
#ifdef notdef
printf("%d/%d/%d - %d:%d:%d\n",
day, month, year, hour, min, sec);
#endif
tt = compute(year, month, day, hour, min, sec);
return(tt);
}
return(1);
}
/*
* Return time since epoch
*/
void time_print(void){
char timebuf[4], datebuf[4];
int st1, st2;
/* Query BIOS for time & date */
st1 = biostime(timebuf);
st2 = biosdate(datebuf);
/* Convert to sane values */
if (!st1 && !st2) {
int year, month, day;
int hour, min, sec;
int dst;
dst = bcdtoint(timebuf[3]);
sec = bcdtoint(timebuf[2]);
min = bcdtoint(timebuf[1]);
hour = bcdtoint(timebuf[0]);
year = bcdtoint(datebuf[0]);
year *= 100;
year += bcdtoint(datebuf[1]);
month = bcdtoint(datebuf[2]);
day = bcdtoint(datebuf[3]);
printf("%d/%d/%d - %d:%d:%d\n", day, month, year, hour, min, sec);
} else
printf("Error in biostime() or biosdate().\n");
return;
}
u_int
sleep(i)
u_int i;
{
register time_t t;
/* loop for that number of seconds, polling BIOS,
so that it may handle interrupts */
for (t = getsecs(); (getsecs() - t) < i; ischar());
return 0;
}
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