69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/*
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* caltontp - convert a date to an NTP time
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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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#include "ntp_unixtime.h"
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/*
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* Juergen Perlinger, 2008-11-12
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* Add support for full calendar calculatios. If the day-of-year is provided
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* (that is, not zero) it will be used instead of month and day-of-month;
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* otherwise a full turn through the calendar calculations will be taken.
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*
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* I know that Harlan Stenn likes to see assertions in production code, and I
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* agree there, but it would be a tricky thing here. The algorithm is quite
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* capable of producing sensible answers even to seemingly weird inputs: the
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* date <any year here>-03-00, the 0.th March of the year, will be automtically
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* treated as the last day of February, no matter whether the year is a leap
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* year or not. So adding constraints is merely for the benefit of the callers,
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* because the only thing we can check for consistency is our input, produced
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* by somebody else.
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*
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* BTW: A total roundtrip using 'caljulian' would be a quite shaky thing:
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* Because of the truncation of the NTP time stamp to 32 bits and the epoch
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* unfolding around the current time done by 'caljulian' the roundtrip does
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* *not* necessarily reproduce the input, especially if the time spec is more
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* than 68 years off from the current time...
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*/
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uint32_t
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caltontp(
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const struct calendar *jt
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)
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{
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int32_t eraday; /* CE Rata Die number */
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vint64 ntptime;/* resulting NTP time */
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NTP_INSIST(jt != NULL);
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NTP_REQUIRE(jt->month <= 13); /* permit month 0..13! */
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NTP_REQUIRE(jt->monthday <= 32);
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NTP_REQUIRE(jt->yearday <= 366);
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NTP_REQUIRE(jt->hour <= 24);
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NTP_REQUIRE(jt->minute <= MINSPERHR);
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NTP_REQUIRE(jt->second <= SECSPERMIN);
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/*
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* First convert the date to he corresponding RataDie
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* number. If yearday is not zero, assume that it contains a
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* useable value and avoid all calculations involving month
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* and day-of-month. Do a full evaluation otherwise.
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*/
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if (jt->yearday)
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eraday = ntpcal_year_to_ystart(jt->year)
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+ jt->yearday - 1;
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else
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eraday = ntpcal_date_to_rd(jt);
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ntptime = ntpcal_dayjoin(eraday - DAY_NTP_STARTS,
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ntpcal_etime_to_seconds(jt->hour, jt->minute,
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jt->second));
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return ntptime.d_s.lo;
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}
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