127 lines
2.9 KiB
C
127 lines
2.9 KiB
C
/*
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* localtime_r.c
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* Original Author: Adapted from tzcode maintained by Arthur David Olson.
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* Modifications:
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* - Changed to mktm_r and added __tzcalc_limits - 04/10/02, Jeff Johnston
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* - Fixed bug in mday computations - 08/12/04, Alex Mogilnikov <alx@intellectronika.ru>
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* - Fixed bug in __tzcalc_limits - 08/12/04, Alex Mogilnikov <alx@intellectronika.ru>
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* - Implement localtime_r() with gmtime_r() and the conditional code moved
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* from _mktm_r() - 05/09/14, Freddie Chopin <freddie_chopin@op.pl>
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*
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* Converts the calendar time pointed to by tim_p into a broken-down time
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* expressed as local time. Returns a pointer to a structure containing the
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* broken-down time.
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*/
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#include "local.h"
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struct tm *
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_DEFUN (localtime_r, (tim_p, res),
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_CONST time_t *__restrict tim_p _AND
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struct tm *__restrict res)
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{
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long offset;
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int hours, mins, secs;
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int year;
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__tzinfo_type *_CONST tz = __gettzinfo ();
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_CONST int *ip;
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res = gmtime_r (tim_p, res);
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year = res->tm_year + YEAR_BASE;
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ip = __month_lengths[isleap(year)];
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TZ_LOCK;
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if (_daylight)
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{
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if (year == tz->__tzyear || __tzcalc_limits (year))
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res->tm_isdst = (tz->__tznorth
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? (*tim_p >= tz->__tzrule[0].change
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&& *tim_p < tz->__tzrule[1].change)
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: (*tim_p >= tz->__tzrule[0].change
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|| *tim_p < tz->__tzrule[1].change));
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else
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res->tm_isdst = -1;
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}
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else
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res->tm_isdst = 0;
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offset = (res->tm_isdst == 1
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? tz->__tzrule[1].offset
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: tz->__tzrule[0].offset);
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hours = (int) (offset / SECSPERHOUR);
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offset = offset % SECSPERHOUR;
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mins = (int) (offset / SECSPERMIN);
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secs = (int) (offset % SECSPERMIN);
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res->tm_sec -= secs;
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res->tm_min -= mins;
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res->tm_hour -= hours;
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if (res->tm_sec >= SECSPERMIN)
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{
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res->tm_min += 1;
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res->tm_sec -= SECSPERMIN;
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}
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else if (res->tm_sec < 0)
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{
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res->tm_min -= 1;
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res->tm_sec += SECSPERMIN;
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}
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if (res->tm_min >= MINSPERHOUR)
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{
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res->tm_hour += 1;
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res->tm_min -= MINSPERHOUR;
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}
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else if (res->tm_min < 0)
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{
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res->tm_hour -= 1;
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res->tm_min += MINSPERHOUR;
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}
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if (res->tm_hour >= HOURSPERDAY)
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{
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++res->tm_yday;
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++res->tm_wday;
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if (res->tm_wday > 6)
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res->tm_wday = 0;
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++res->tm_mday;
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res->tm_hour -= HOURSPERDAY;
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if (res->tm_mday > ip[res->tm_mon])
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{
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res->tm_mday -= ip[res->tm_mon];
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res->tm_mon += 1;
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if (res->tm_mon == 12)
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{
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res->tm_mon = 0;
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res->tm_year += 1;
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res->tm_yday = 0;
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}
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}
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}
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else if (res->tm_hour < 0)
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{
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res->tm_yday -= 1;
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res->tm_wday -= 1;
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if (res->tm_wday < 0)
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res->tm_wday = 6;
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res->tm_mday -= 1;
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res->tm_hour += 24;
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if (res->tm_mday == 0)
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{
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res->tm_mon -= 1;
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if (res->tm_mon < 0)
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{
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res->tm_mon = 11;
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res->tm_year -= 1;
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res->tm_yday = 364 + isleap(res->tm_year + YEAR_BASE);
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}
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res->tm_mday = ip[res->tm_mon];
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}
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}
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TZ_UNLOCK;
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return (res);
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}
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