89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
/*
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* calyearstart - determine the NTP time at midnight of January 1 in
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* the year of the given date.
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*/
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#include <config.h>
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#include <sys/types.h>
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#include "ntp_types.h"
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#include "ntp_calendar.h"
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#include "ntp_stdlib.h"
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#include "ntp_assert.h"
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/*
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* Juergen Perlinger, 2010-05-02
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*
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* Redone in terms of the calendar functions. It's rather simple:
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* - expand the NTP time stamp
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* - split into days and seconds since midnight, dropping the partial day
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* - get full number of days before year start in NTP epoch
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* - convert to seconds, truncated to 32 bits.
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*/
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u_int32
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calyearstart(u_int32 ntptime, const time_t *pivot)
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{
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u_int32 ndays; /* elapsed days since NTP starts */
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vint64 vlong;
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ntpcal_split split;
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vlong = ntpcal_ntp_to_ntp(ntptime, pivot);
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split = ntpcal_daysplit(&vlong);
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ndays = ntpcal_rd_to_ystart(split.hi + DAY_NTP_STARTS)
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- DAY_NTP_STARTS;
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return (u_int32)(ndays * SECSPERDAY);
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}
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/*
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* calmonthstart - get NTP time at midnight of the first day of the
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* current month.
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*/
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u_int32
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calmonthstart(u_int32 ntptime, const time_t *pivot)
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{
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u_int32 ndays; /* elapsed days since NTP starts */
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vint64 vlong;
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ntpcal_split split;
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vlong = ntpcal_ntp_to_ntp(ntptime, pivot);
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split = ntpcal_daysplit(&vlong);
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ndays = ntpcal_rd_to_mstart(split.hi + DAY_NTP_STARTS)
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- DAY_NTP_STARTS;
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return (u_int32)(ndays * SECSPERDAY);
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}
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/*
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* calweekstart - get NTP time at midnight of the last monday on or
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* before the current date.
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*/
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u_int32
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calweekstart(u_int32 ntptime, const time_t *pivot)
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{
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u_int32 ndays; /* elapsed days since NTP starts */
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vint64 vlong;
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ntpcal_split split;
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vlong = ntpcal_ntp_to_ntp(ntptime, pivot);
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split = ntpcal_daysplit(&vlong);
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ndays = ntpcal_weekday_le(split.hi + DAY_NTP_STARTS, CAL_MONDAY)
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- DAY_NTP_STARTS;
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return (u_int32)(ndays * SECSPERDAY);
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}
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/*
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* caldaystart - get NTP time at midnight of the current day.
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*/
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u_int32
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caldaystart(u_int32 ntptime, const time_t *pivot)
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{
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vint64 vlong;
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ntpcal_split split;
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vlong = ntpcal_ntp_to_ntp(ntptime, pivot);
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split = ntpcal_daysplit(&vlong);
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return ntptime - split.lo;
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}
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