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      1 /*	$NetBSD: chiptotime.c,v 1.7 2014/11/20 16:34:25 christos Exp $ */
      2 
      3 #include <sys/types.h>
      4 #include <dev/clock_subr.h>
      5 
      6 #include <machine/prom.h>
      7 
      8 #include <lib/libsa/stand.h>
      9 #include "libsa.h"
     10 
     11 #define YEAR0		68
     12 
     13 /*
     14  * This code is defunct after 2068.
     15  * Will Unix still be here then??
     16  */
     17 const short dayyr[12] =
     18     {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
     19 
     20 u_long
     21 chiptotime(int sec, int min, int hour, int day, int mon, int year)
     22 {
     23 	int days, yr;
     24 
     25 	sec = bcdtobin(sec);
     26 	min = bcdtobin(min);
     27 	hour = bcdtobin(hour);
     28 	day = bcdtobin(day);
     29 	mon = bcdtobin(mon);
     30 	year = bcdtobin(year) + YEAR0;
     31 	if (year < 70)
     32 		year = 70;
     33 
     34 	/* simple sanity checks */
     35 	if (year < 70 || mon < 1 || mon > 12 || day < 1 || day > 31)
     36 		return (0);
     37 	days = 0;
     38 	for (yr = 70; yr < year; yr++)
     39 		days += days_per_year(yr);
     40 	days += dayyr[mon - 1] + day - 1;
     41 	if (is_leap_year(yr) && mon > 2)
     42 		days++;
     43 	/* now have days since Jan 1, 1970; the rest is easy... */
     44 	return days * SECS_PER_DAY + hour * SECS_PER_HOUR
     45 	    + min * SECS_PER_MINUTE + sec;
     46 }
     47