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/* $OpenBSD: clock.c,v 1.2 1996/04/28 10:48:57 deraadt Exp $ */
#include <sys/types.h>
#include "clockreg.h"
#include "config.h"
#include "clock.h"
/*
* BCD to decimal and decimal to BCD.
*/
#define FROMBCD(x) (((x) >> 4) * 10 + ((x) & 0xf))
#define TOBCD(x) (((x) / 10 * 16) + ((x) % 10))
#define SECDAY (24 * 60 * 60)
#define SECYR (SECDAY * 365)
#define LEAPYEAR(y) (((y) & 3) == 0)
/*
* This code is defunct after 2068.
* Will Unix still be here then??
*/
const short dayyr[12] =
{0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
static u_long
chiptotime(sec, min, hour, day, mon, year)
register int sec, min, hour, day, mon, year;
{
register int days, yr;
sec = FROMBCD(sec);
min = FROMBCD(min);
hour = FROMBCD(hour);
day = FROMBCD(day);
mon = FROMBCD(mon);
year = FROMBCD(year) + YEAR0;
if (year < 70)
year = 70;
/* simple sanity checks */
if (year < 70 || mon < 1 || mon > 12 || day < 1 || day > 31)
return (0);
days = 0;
for (yr = 70; yr < year; yr++)
days += LEAPYEAR(yr) ? 366 : 365;
days += dayyr[mon - 1] + day - 1;
if (LEAPYEAR(yr) && mon > 2)
days++;
/* now have days since Jan 1, 1970; the rest is easy... */
return (days * SECDAY + hour * 3600 + min * 60 + sec);
}
time_t
getsecs()
{
extern int cputyp;
register struct clockreg *cl;
int sec, min, hour, day, mon, year;
if (cputyp == CPU_147)
cl = (struct clockreg *) CLOCK_ADDR_147;
else
cl = (struct clockreg *) CLOCK_ADDR_16x;
cl->cl_csr |= CLK_READ; /* enable read (stop time) */
sec = cl->cl_sec;
min = cl->cl_min;
hour = cl->cl_hour;
day = cl->cl_mday;
mon = cl->cl_month;
year = cl->cl_year;
cl->cl_csr &= ~CLK_READ;/* time wears on */
return (chiptotime(sec, min, hour, day, mon, year));
}
int
getticks()
{
return getsecs() * 100;
}
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