blob: d68bbe97bb038264d3e1ecd2862be1e8104c8e19 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
|
/*
* calleapwhen - determine the number of seconds to the next possible
* leap occurance and the last one.
*/
#include <sys/types.h>
#include "ntp_types.h"
#include "ntp_calendar.h"
#include "ntp_stdlib.h"
/*
* calleaptab - leaps occur at the end of December and June
*/
long calleaptab[10] = {
-(JAN+FEBLEAP)*SECSPERDAY, /* leap previous to cycle */
(MAR+APR+MAY+JUN)*SECSPERDAY, /* end of June */
(MAR+APR+MAY+JUN+JUL+AUG+SEP+OCT+NOV+DEC)*SECSPERDAY, /* end of Dec */
(MAR+APR+MAY+JUN)*SECSPERDAY + SECSPERYEAR,
(MAR+APR+MAY+JUN+JUL+AUG+SEP+OCT+NOV+DEC)*SECSPERDAY + SECSPERYEAR,
(MAR+APR+MAY+JUN)*SECSPERDAY + 2*SECSPERYEAR,
(MAR+APR+MAY+JUN+JUL+AUG+SEP+OCT+NOV+DEC)*SECSPERDAY + 2*SECSPERYEAR,
(MAR+APR+MAY+JUN)*SECSPERDAY + 3*SECSPERYEAR,
(MAR+APR+MAY+JUN+JUL+AUG+SEP+OCT+NOV+DEC)*SECSPERDAY + 3*SECSPERYEAR,
(MAR+APR+MAY+JUN+JUL+AUG+SEP+OCT+NOV+DEC+JAN+FEBLEAP+MAR+APR+MAY+JUN)
*SECSPERDAY + 3*SECSPERYEAR, /* next after current cycle */
};
void
calleapwhen(ntpdate, leaplast, leapnext)
u_long ntpdate;
u_long *leaplast;
u_long *leapnext;
{
register u_long dateincycle;
register int i;
/*
* Find the offset from the start of the cycle
*/
dateincycle = ntpdate;
if (dateincycle >= MAR1988)
dateincycle -= MAR1988;
else
dateincycle -= MAR1900;
while (dateincycle >= SECSPERCYCLE)
dateincycle -= SECSPERCYCLE;
/*
* Find where we are with respect to the leap events.
*/
for (i = 1; i < 9; i++)
if (dateincycle < (u_long)calleaptab[i])
break;
/*
* i points at the next leap. Compute the last and the next.
*/
*leaplast = (u_long)((long)dateincycle - calleaptab[i-1]);
*leapnext = (u_long)(calleaptab[i] - (long)dateincycle);
}
|
