113 lines
2.9 KiB
C
113 lines
2.9 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2012 by Bertrik Sikken
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*
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* Based on code from: rtc_as3514.c
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* Copyright (C) 2007 by Barry Wardell
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdbool.h>
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#include "time.h"
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#define MINUTE_SECONDS 60
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#define HOUR_SECONDS 3600
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#define DAY_SECONDS 86400
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#define WEEK_SECONDS 604800
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#define YEAR_SECONDS 31536000
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#define LEAP_YEAR_SECONDS 31622400
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/* Days in each month */
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static int days_in_month[] =
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{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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static inline bool is_leapyear(int year)
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{
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return (((year%4)==0) && (((year%100)!=0) || ((year%400)==0)));
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}
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struct tm *gmtime(const time_t *timep)
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{
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static struct tm time;
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return gmtime_r(timep, &time);
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}
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struct tm *gmtime_r(const time_t *timep, struct tm *tm)
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{
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time_t seconds = *timep;
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int year, i, mday, hour, min;
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/* weekday */
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tm->tm_wday = ((seconds % WEEK_SECONDS) / DAY_SECONDS + 4) % 7;
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/* Year */
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year = 1970;
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while (seconds >= LEAP_YEAR_SECONDS)
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{
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if (is_leapyear(year)){
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seconds -= LEAP_YEAR_SECONDS;
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} else {
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seconds -= YEAR_SECONDS;
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}
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year++;
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}
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if (is_leapyear(year)) {
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days_in_month[1] = 29;
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} else {
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days_in_month[1] = 28;
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if(seconds>YEAR_SECONDS){
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year++;
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seconds -= YEAR_SECONDS;
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}
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}
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tm->tm_year = year%100 + 100;
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/* Month */
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for (i = 0; i < 12; i++)
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{
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if (seconds < days_in_month[i]*DAY_SECONDS){
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tm->tm_mon = i;
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break;
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}
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seconds -= days_in_month[i]*DAY_SECONDS;
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}
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/* Month Day */
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mday = seconds/DAY_SECONDS;
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seconds -= mday*DAY_SECONDS;
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tm->tm_mday = mday + 1; /* 1 ... 31 */
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/* Hour */
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hour = seconds/HOUR_SECONDS;
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seconds -= hour*HOUR_SECONDS;
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tm->tm_hour = hour;
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/* Minute */
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min = seconds/MINUTE_SECONDS;
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seconds -= min*MINUTE_SECONDS;
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tm->tm_min = min;
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/* Second */
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tm->tm_sec = seconds;
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return tm;
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}
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