kopia lustrzana https://github.com/micropython/micropython
216 wiersze
6.5 KiB
C
216 wiersze
6.5 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2013, 2014 Damien P. George
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* Copyright (c) 2015 Daniel Campora
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "py/obj.h"
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#include "timeutils.h"
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// LEAPOCH corresponds to 2000-03-01, which is a mod-400 year, immediately
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// after Feb 29. We calculate seconds as a signed integer relative to that.
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//
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// Our timebase is is relative to 2000-01-01.
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#define LEAPOCH ((31 + 29) * 86400)
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#define DAYS_PER_400Y (365*400 + 97)
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#define DAYS_PER_100Y (365*100 + 24)
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#define DAYS_PER_4Y (365*4 + 1)
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STATIC const uint16_t days_since_jan1[]= { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 };
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bool timeutils_is_leap_year(mp_uint_t year) {
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return (year % 4 == 0 && year % 100 != 0) || year % 400 == 0;
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}
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// month is one based
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mp_uint_t timeutils_days_in_month(mp_uint_t year, mp_uint_t month) {
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mp_uint_t mdays = days_since_jan1[month] - days_since_jan1[month - 1];
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if (month == 2 && timeutils_is_leap_year(year)) {
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mdays++;
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}
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return mdays;
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}
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// compute the day of the year, between 1 and 366
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// month should be between 1 and 12, date should start at 1
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mp_uint_t timeutils_year_day(mp_uint_t year, mp_uint_t month, mp_uint_t date) {
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mp_uint_t yday = days_since_jan1[month - 1] + date;
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if (month >= 3 && timeutils_is_leap_year(year)) {
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yday += 1;
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}
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return yday;
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}
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void timeutils_seconds_since_2000_to_struct_time(mp_uint_t t, timeutils_struct_time_t *tm) {
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// The following algorithm was adapted from musl's __secs_to_tm and adapted
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// for differences in Micro Python's timebase.
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mp_int_t seconds = t - LEAPOCH;
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mp_int_t days = seconds / 86400;
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seconds %= 86400;
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if (seconds < 0) {
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seconds += 86400;
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days -= 1;
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}
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tm->tm_hour = seconds / 3600;
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tm->tm_min = seconds / 60 % 60;
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tm->tm_sec = seconds % 60;
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mp_int_t wday = (days + 2) % 7; // Mar 1, 2000 was a Wednesday (2)
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if (wday < 0) {
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wday += 7;
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}
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tm->tm_wday = wday;
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mp_int_t qc_cycles = days / DAYS_PER_400Y;
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days %= DAYS_PER_400Y;
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if (days < 0) {
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days += DAYS_PER_400Y;
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qc_cycles--;
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}
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mp_int_t c_cycles = days / DAYS_PER_100Y;
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if (c_cycles == 4) {
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c_cycles--;
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}
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days -= (c_cycles * DAYS_PER_100Y);
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mp_int_t q_cycles = days / DAYS_PER_4Y;
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if (q_cycles == 25) {
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q_cycles--;
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}
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days -= q_cycles * DAYS_PER_4Y;
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mp_int_t years = days / 365;
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if (years == 4) {
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years--;
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}
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days -= (years * 365);
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/* We will compute tm_yday at the very end
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mp_int_t leap = !years && (q_cycles || !c_cycles);
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tm->tm_yday = days + 31 + 28 + leap;
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if (tm->tm_yday >= 365 + leap) {
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tm->tm_yday -= 365 + leap;
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}
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tm->tm_yday++; // Make one based
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*/
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tm->tm_year = 2000 + years + 4 * q_cycles + 100 * c_cycles + 400 * qc_cycles;
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// Note: days_in_month[0] corresponds to March
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STATIC const int8_t days_in_month[] = {31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 31, 29};
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mp_int_t month;
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for (month = 0; days_in_month[month] <= days; month++) {
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days -= days_in_month[month];
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}
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tm->tm_mon = month + 2;
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if (tm->tm_mon >= 12) {
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tm->tm_mon -= 12;
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tm->tm_year++;
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}
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tm->tm_mday = days + 1; // Make one based
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tm->tm_mon++; // Make one based
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tm->tm_yday = timeutils_year_day(tm->tm_year, tm->tm_mon, tm->tm_mday);
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}
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// returns the number of seconds, as an integer, since 2000-01-01
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mp_uint_t timeutils_seconds_since_2000(mp_uint_t year, mp_uint_t month,
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mp_uint_t date, mp_uint_t hour, mp_uint_t minute, mp_uint_t second) {
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return
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second
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+ minute * 60
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+ hour * 3600
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+ (timeutils_year_day(year, month, date) - 1
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+ ((year - 2000 + 3) / 4) // add a day each 4 years starting with 2001
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- ((year - 2000 + 99) / 100) // subtract a day each 100 years starting with 2001
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+ ((year - 2000 + 399) / 400) // add a day each 400 years starting with 2001
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) * 86400
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+ (year - 2000) * 31536000;
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}
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mp_uint_t timeutils_mktime(mp_uint_t year, mp_uint_t month, mp_uint_t mday,
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mp_uint_t hours, mp_uint_t minutes, mp_uint_t seconds) {
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// Normalize the tuple. This allows things like:
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//
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// tm_tomorrow = list(time.localtime())
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// tm_tomorrow[2] += 1 # Adds 1 to mday
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// tomorrow = time.mktime(tm_tommorrow)
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//
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// And not have to worry about all the weird overflows.
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//
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// You can subtract dates/times this way as well.
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minutes += seconds / 60;
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if ((seconds = seconds % 60) < 0) {
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seconds += 60;
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minutes--;
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}
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hours += minutes / 60;
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if ((minutes = minutes % 60) < 0) {
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minutes += 60;
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hours--;
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}
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mday += hours / 24;
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if ((hours = hours % 24) < 0) {
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hours += 24;
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mday--;
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}
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month--; // make month zero based
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year += month / 12;
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if ((month = month % 12) < 0) {
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month += 12;
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year--;
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}
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month++; // back to one based
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while (mday < 1) {
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if (--month == 0) {
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month = 12;
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year--;
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}
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mday += timeutils_days_in_month(year, month);
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}
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while (mday > timeutils_days_in_month(year, month)) {
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mday -= timeutils_days_in_month(year, month);
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if (++month == 13) {
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month = 1;
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year++;
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}
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}
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return timeutils_seconds_since_2000(year, month, mday, hours, minutes, seconds);
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}
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