41 lines
946 B
C
41 lines
946 B
C
/*
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* gmtime - convert the calendar time into broken down time
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*/
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/* $Id$ */
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#include <time.h>
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#include <limits.h>
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#include "loc_time.h"
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struct tm *
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gmtime(register const time_t *timer)
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{
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static struct tm br_time;
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register struct tm *timep = &br_time;
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time_t tim = *timer;
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register unsigned long dayclock, dayno;
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int year = EPOCH_YR;
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dayclock = (unsigned long)tim % SECS_DAY;
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dayno = (unsigned long)tim / SECS_DAY;
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timep->tm_sec = dayclock % 60;
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timep->tm_min = (dayclock % 3600) / 60;
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timep->tm_hour = dayclock / 3600;
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timep->tm_wday = (dayno + 4) % 7; /* day 0 was a thursday */
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while (dayno >= YEARSIZE(year)) {
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dayno -= YEARSIZE(year);
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year++;
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}
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timep->tm_year = year - YEAR0;
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timep->tm_yday = dayno;
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timep->tm_mon = 0;
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while (dayno >= _ytab[LEAPYEAR(year)][timep->tm_mon]) {
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dayno -= _ytab[LEAPYEAR(year)][timep->tm_mon];
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timep->tm_mon++;
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}
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timep->tm_mday = dayno + 1;
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timep->tm_isdst = 0;
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return timep;
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}
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