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/* $OpenBSD: time.c,v 1.5 1997/07/17 23:00:27 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 <sys/time.h>
#include "libsa.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(register char c){
return ((c & 0xf0) >> 4) * 10 + (c & 0x0f);
}
/* Number of days per month */
static char 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) {
register time_t tt;
register int i;
/* Compute years of seconds */
tt = (year - 1970) * (365 * 24 * 60 * 60);
/* Compute days of seconds */
for(i = 1; i < month; i++)
day += monthcount[i];
/* Compute for leap year */
for(i = 1970; i < year; i++)
if(isleap(i))
day++;
tt += day * (24 * 60 * 60);
/* Plus the time */
tt += sec + 60 * (min + 60 * hour);
return tt;
}
/*
* Return time since epoch
*/
time_t
getsecs(void) {
char timebuf[4], datebuf[4];
/* Query BIOS for time & date */
if(!biostime(timebuf) && !biosdate(datebuf)) {
#ifdef notdef
int dst;
dst = bcdtoint(timebuf[3]);
#endif
/* Convert to seconds since Epoch */
return compute(bcdtoint(datebuf[0])*100 + bcdtoint(datebuf[1]),
bcdtoint(datebuf[2]), bcdtoint(datebuf[3]),
bcdtoint(timebuf[0]), bcdtoint(timebuf[1]),
bcdtoint(timebuf[2]));
} else
errno = EIO;
return(1);
}
/*
* Return time since epoch
*/
void
time_print(void) {
char timebuf[4], datebuf[4];
/* Query BIOS for time & date */
if(!biostime(timebuf) && !biosdate(datebuf)) {
#ifdef notdef
int dst;
dst = bcdtoint(timebuf[3]);
#endif
/* Convert to sane values */
printf("%d/%d/%d - %d:%d:%d\n",
bcdtoint(datebuf[3]), bcdtoint(datebuf[2]),
bcdtoint(datebuf[0]) * 100 + bcdtoint(datebuf[1]),
bcdtoint(timebuf[0]), bcdtoint(timebuf[1]),
bcdtoint(timebuf[2]));
} 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() + i; getsecs() < t; ischar());
return 0;
}
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