diff options
Diffstat (limited to 'newlib/libc/time/lcltime_r.c')
| -rw-r--r-- | newlib/libc/time/lcltime_r.c | 112 |
1 files changed, 110 insertions, 2 deletions
diff --git a/newlib/libc/time/lcltime_r.c b/newlib/libc/time/lcltime_r.c index 9e168aa3f..9094e5d3a 100644 --- a/newlib/libc/time/lcltime_r.c +++ b/newlib/libc/time/lcltime_r.c @@ -1,12 +1,18 @@ /* * localtime_r.c + * Original Author: Adapted from tzcode maintained by Arthur David Olson. + * Modifications: + * - Changed to mktm_r and added __tzcalc_limits - 04/10/02, Jeff Johnston + * - Fixed bug in mday computations - 08/12/04, Alex Mogilnikov <alx@intellectronika.ru> + * - Fixed bug in __tzcalc_limits - 08/12/04, Alex Mogilnikov <alx@intellectronika.ru> + * - Implement localtime_r() with gmtime_r() and the conditional code moved + * from _mktm_r() - 05/09/14, Freddie Chopin <freddie_chopin@op.pl> * * Converts the calendar time pointed to by tim_p into a broken-down time * expressed as local time. Returns a pointer to a structure containing the * broken-down time. */ -#include <time.h> #include "local.h" struct tm * @@ -14,5 +20,107 @@ _DEFUN (localtime_r, (tim_p, res), _CONST time_t *__restrict tim_p _AND struct tm *__restrict res) { - return _mktm_r (tim_p, res, 0); + long offset; + int hours, mins, secs; + int year; + __tzinfo_type *_CONST tz = __gettzinfo (); + _CONST int *ip; + + res = gmtime_r (tim_p, res); + + year = res->tm_year + YEAR_BASE; + ip = __month_lengths[isleap(year)]; + + TZ_LOCK; + if (_daylight) + { + if (year == tz->__tzyear || __tzcalc_limits (year)) + res->tm_isdst = (tz->__tznorth + ? (*tim_p >= tz->__tzrule[0].change + && *tim_p < tz->__tzrule[1].change) + : (*tim_p >= tz->__tzrule[0].change + || *tim_p < tz->__tzrule[1].change)); + else + res->tm_isdst = -1; + } + else + res->tm_isdst = 0; + + offset = (res->tm_isdst == 1 + ? tz->__tzrule[1].offset + : tz->__tzrule[0].offset); + + hours = (int) (offset / SECSPERHOUR); + offset = offset % SECSPERHOUR; + + mins = (int) (offset / SECSPERMIN); + secs = (int) (offset % SECSPERMIN); + + res->tm_sec -= secs; + res->tm_min -= mins; + res->tm_hour -= hours; + + if (res->tm_sec >= SECSPERMIN) + { + res->tm_min += 1; + res->tm_sec -= SECSPERMIN; + } + else if (res->tm_sec < 0) + { + res->tm_min -= 1; + res->tm_sec += SECSPERMIN; + } + if (res->tm_min >= MINSPERHOUR) + { + res->tm_hour += 1; + res->tm_min -= MINSPERHOUR; + } + else if (res->tm_min < 0) + { + res->tm_hour -= 1; + res->tm_min += MINSPERHOUR; + } + if (res->tm_hour >= HOURSPERDAY) + { + ++res->tm_yday; + ++res->tm_wday; + if (res->tm_wday > 6) + res->tm_wday = 0; + ++res->tm_mday; + res->tm_hour -= HOURSPERDAY; + if (res->tm_mday > ip[res->tm_mon]) + { + res->tm_mday -= ip[res->tm_mon]; + res->tm_mon += 1; + if (res->tm_mon == 12) + { + res->tm_mon = 0; + res->tm_year += 1; + res->tm_yday = 0; + } + } + } + else if (res->tm_hour < 0) + { + res->tm_yday -= 1; + res->tm_wday -= 1; + if (res->tm_wday < 0) + res->tm_wday = 6; + res->tm_mday -= 1; + res->tm_hour += 24; + if (res->tm_mday == 0) + { + res->tm_mon -= 1; + if (res->tm_mon < 0) + { + res->tm_mon = 11; + res->tm_year -= 1; + res->tm_yday = 364 + isleap(res->tm_year + YEAR_BASE); + } + res->tm_mday = ip[res->tm_mon]; + } + } + TZ_UNLOCK; + + return (res); } |