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97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/*
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* Copyright (C) 2014 René Kijewski <rene.kijewski@fu-berlin.de>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* @author René Kijewski <rene.kijewski@fu-berlin.de>
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*/
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#include "tm.h"
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#include <stdint.h>
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const int8_t TM_MON_DAYS[12] = {
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31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
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};
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const int16_t TM_MON_DAYS_ACCU[12] = {
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0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
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};
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int tm_is_leap_year(unsigned year)
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{
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return ((year & 3) == 0) && ((year % 400 == 0) || (year % 100 != 0));
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}
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int tm_doomsday(int year)
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{
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int result;
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result = TM_WDAY_TUE;
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result += year;
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result += year >>= 2;
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result -= year /= 25;
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result += year >>= 2;
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return result;
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}
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#ifndef ATMEGA_INCOMPATIBLE_TIME_H
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void tm_get_wyday(int year, int mon, int mday, int *wday, int *yday)
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#else
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void tm_get_wyday(int year, int mon, int mday, int8_t *wday, int16_t *yday)
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#endif
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{
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int is_leap_year = tm_is_leap_year(year);
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*yday = TM_MON_DAYS_ACCU[mon] + mday + (mon <= TM_MON_FEB ? 0 : is_leap_year) - 1;
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int jan1 = tm_doomsday(year) - 2 - is_leap_year;
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*wday = (jan1 + *yday) % 7;
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}
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void tm_fill_derived_values(struct tm *tm)
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{
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tm_get_wyday(tm->tm_year + 1900, tm->tm_mon, tm->tm_mday, &tm->tm_wday, &tm->tm_yday);
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}
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int tm_is_valid_date(int year, int mon, int mday)
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{
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if ((mon < TM_MON_JAN) || (mon > TM_MON_DEC)) {
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return 0;
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}
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if ((mday <= 0) || (mday > TM_MON_DAYS[mon])) {
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if ((mday != 29) || (mon != TM_MON_FEB) || !tm_is_leap_year(year)) {
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return 0;
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}
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}
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if (year <= 1582) {
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if (year < 1582) {
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return 0;
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}
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if ((mon < TM_MON_OCT) || ((mon == TM_MON_OCT) && (mday < 15))) {
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return 0;
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}
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}
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return 1;
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}
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int tm_is_valid_time(int hour, int min, int sec)
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{
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return (hour >= 0) && (hour < 24) &&
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(min >= 0) && (min < 60) &&
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(sec >= 0) && (sec <= 60);
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}
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