mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-12-03 08:22:44 +00:00
91 lines
2.0 KiB
C
91 lines
2.0 KiB
C
/*
|
|
* caltontp - convert a julian date to an NTP time
|
|
*/
|
|
#include <sys/types.h>
|
|
|
|
#include "ntp_types.h"
|
|
#include "ntp_calendar.h"
|
|
#include "ntp_stdlib.h"
|
|
|
|
/*
|
|
* calmonthtab - month start offsets from the beginning of a cycle.
|
|
*/
|
|
static u_short calmonthtab[12] = {
|
|
0, /* March */
|
|
MAR, /* April */
|
|
(MAR+APR), /* May */
|
|
(MAR+APR+MAY), /* June */
|
|
(MAR+APR+MAY+JUN), /* July */
|
|
(MAR+APR+MAY+JUN+JUL), /* August */
|
|
(MAR+APR+MAY+JUN+JUL+AUG), /* September */
|
|
(MAR+APR+MAY+JUN+JUL+AUG+SEP), /* October */
|
|
(MAR+APR+MAY+JUN+JUL+AUG+SEP+OCT), /* November */
|
|
(MAR+APR+MAY+JUN+JUL+AUG+SEP+OCT+NOV), /* December */
|
|
(MAR+APR+MAY+JUN+JUL+AUG+SEP+OCT+NOV+DEC), /* January */
|
|
(MAR+APR+MAY+JUN+JUL+AUG+SEP+OCT+NOV+DEC+JAN), /* February */
|
|
};
|
|
|
|
u_long
|
|
caltontp(jt)
|
|
register const struct calendar *jt;
|
|
{
|
|
register int cyear;
|
|
register int resyear;
|
|
register u_long nt;
|
|
register int yearday;
|
|
|
|
/*
|
|
* Find the start of the cycle this is in.
|
|
*/
|
|
cyear = (int)(jt->year - 1900) >> 2;
|
|
resyear = (jt->year - 1900) - (cyear << 2);
|
|
yearday = 0;
|
|
if (resyear == 0) {
|
|
if (jt->yearday == 0) {
|
|
if (jt->month == 1 || jt->month == 2) {
|
|
cyear--;
|
|
resyear = 3;
|
|
}
|
|
} else {
|
|
if (jt->yearday <= (u_short)(JAN+FEBLEAP)) {
|
|
cyear--;
|
|
resyear = 3;
|
|
yearday = calmonthtab[10] + jt->yearday;
|
|
} else {
|
|
yearday = jt->yearday - (JAN+FEBLEAP);
|
|
}
|
|
}
|
|
} else {
|
|
if (jt->yearday == 0) {
|
|
if (jt->month == 1 || jt->month == 2)
|
|
resyear--;
|
|
} else {
|
|
if (jt->yearday <= (u_short)(JAN+FEB)) {
|
|
resyear--;
|
|
yearday = calmonthtab[10] + jt->yearday;
|
|
} else {
|
|
yearday = jt->yearday - (JAN+FEB);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (yearday == 0) {
|
|
if (jt->month >= 3) {
|
|
yearday = calmonthtab[jt->month - 3] + jt->monthday;
|
|
} else {
|
|
yearday = calmonthtab[jt->month + 9] + jt->monthday;
|
|
}
|
|
}
|
|
|
|
nt = TIMESDPERC((u_long)cyear);
|
|
while (resyear-- > 0)
|
|
nt += DAYSPERYEAR;
|
|
nt += (u_long) (yearday - 1);
|
|
|
|
nt = TIMES24(nt) + (u_long)jt->hour;
|
|
nt = TIMES60(nt) + (u_long)jt->minute;
|
|
nt = TIMES60(nt) + (u_long)jt->second;
|
|
|
|
return nt + MAR1900;
|
|
}
|