sys/arch/mvme68k/stand/libsa/chiptotime.c

   1 /*      $NetBSD: chiptotime.c,v 1.3 2005/12/11 12:18:19 christos Exp $ */
   2
   3 #include <sys/types.h>
   4
   5 #include <machine/prom.h>
   6
   7 #include <lib/libsa/stand.h>
   8 #include "libsa.h"
   9
  10 /*
  11  * BCD to decimal and decimal to BCD.
  12  */
  13 #define FROMBCD(x)      (int)((((unsigned int)(x)) >> 4) * 10 +\
  14                                 (((unsigned int)(x)) & 0xf))
  15 #define TOBCD(x)        (int)((((unsigned int)(x)) / 10 * 16) +\
  16                                 (((unsigned int)(x)) % 10))
  17
  18 #define SECDAY          (24 * 60 * 60)
  19 #define SECYR           (SECDAY * 365)
  20 #define LEAPYEAR(y)     (((y) & 3) == 0)
  21 #define YEAR0           68
  22
  23 /*
  24  * This code is defunct after 2068.
  25  * Will Unix still be here then??
  26  */
  27 const short dayyr[12] =
  28     {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
  29
  30 u_long
  31 chiptotime(int sec, int min, int hour, int day, int mon, int year)
  32 {
  33         int days, yr;
  34
  35         sec = FROMBCD(sec);
  36         min = FROMBCD(min);
  37         hour = FROMBCD(hour);
  38         day = FROMBCD(day);
  39         mon = FROMBCD(mon);
  40         year = FROMBCD(year) + YEAR0;
  41         if (year < 70)
  42                 year = 70;
  43
  44         /* simple sanity checks */
  45         if (year < 70 || mon < 1 || mon > 12 || day < 1 || day > 31)
  46                 return (0);
  47         days = 0;
  48         for (yr = 70; yr < year; yr++)
  49                 days += LEAPYEAR(yr) ? 366 : 365;
  50         days += dayyr[mon - 1] + day - 1;
  51         if (LEAPYEAR(yr) && mon > 2)
  52                 days++;
  53         /* now have days since Jan 1, 1970; the rest is easy... */
  54         return days * SECDAY + hour * 3600 + min * 60 + sec;
  55 }