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#include <time.h>
static int mdays[13] = { 0,31,31+28,31+28+31,31+28+31+30,
31+28+31+30+31,31+28+31+30+31+30,31+28+31+30+31+30+31,
31+28+31+30+31+30+31+31,31+28+31+30+31+30+31+31+30,
31+28+31+30+31+30+31+31+30+31,31+28+31+30+31+30+31+31+30+31+30,
365 };
#define SECSPERHOUR (60*60)
#define SECSPERDAY (SECSPERHOUR*24L)
/****************************************
* Return the number of seconds that have elapsed since the start
* of 1970.
* Input:
* timer pointer to where to store result (or NULL)
* Output:
* *timer = result (unless timer == NULL)
* Returns:
* time
*/
static long get_time(ah)
{
#asm
#if !__FIRST_ARG_IN_AX__
mov bx,sp
mov ax,[bx+2]
#endif
mov ah,al
int $21
mov ax,dx
mov dx,cx
#endasm
}
time_t time(timer)
time_t *timer;
{
unsigned day,month,year;
long rv;
time_t t;
rv = get_time(0x2C);
rv >>= 8; t = (rv & 0xFF);
rv >>= 8; t += (rv & 0xFF)*60;
rv >>= 8; t += (rv & 0xFF)*3600;
rv = get_time(0x2A);
day = (rv & 0xFF);
rv >>= 8; month = (rv & 0xFF) -1;
rv >>= 8; year = (rv & 0xFFFF) - 1970;
if (month <= 1 || year & 3) /* if before Feb or not a leap year */
day--; /* don't add day for this leap year */
day += mdays[month]; /* day in year */
day += (year + 3) >> 2; /* add a day for each leap year, but */
/* don't worry about 2100 */
t += ((year * 365L) + day) * SECSPERDAY;
if (timer)
*timer = t;
return t;
}
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