mktime.c

来自「ADS环境下的类似linux内核的操作系统」· C语言 代码 · 共 61 行

/* MShowTec - www.mshowtec.com
** msLinux mktime.c ver1.0
** 20051221 lmjx create [e-mail]
** 
*/

#define MSLINUX_MKTIME_C

#include "time.h"
#include "mktime.h"

static int month[12] = {
  0,
  DAY * (31),
  DAY * (31 + 29),
  DAY * (31 + 29 + 31),
  DAY * (31 + 29 + 31 + 30),
  DAY * (31 + 29 + 31 + 30 + 31),
  DAY * (31 + 29 + 31 + 30 + 31 + 30),
  DAY * (31 + 29 + 31 + 30 + 31 + 30 + 31),
  DAY * (31 + 29 + 31 + 30 + 31 + 30 + 31 + 31),
  DAY * (31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30),
  DAY * (31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31),
  DAY * (31 + 29 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30)
};

long kernel_mktime (struct tm *tm)
{
  long res;
  int year;

  year = tm->tm_year;

  res = YEAR * year + DAY * ((year + 1) / 4);
  res += month[tm->tm_mon];
 
  if (tm->tm_mon > 1 && ((year + 2) % 4))
    res -= DAY;
  res += DAY * (tm->tm_mday - 1);
  res += HOUR * tm->tm_hour;
  res += MINUTE * tm->tm_min;
  res += tm->tm_sec;
  
  return res;
  
}

void time_init(void)
{
	struct tm time;

	time.tm_sec = 0;
	time.tm_min = 0;
	time.tm_hour = 0;
	time.tm_mday = 0;
	time.tm_mon = 0;
	time.tm_year = 1980;

	startup_time = kernel_mktime(&time);
}