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orbimote/firmware/time_utils.c
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#include <stddef.h>
#define ENABLE_DEBUG (1)
#include "debug.h"
#include <time.h>
#include "periph_conf.h"
#include "periph/rtc.h"
#include <inttypes.h>
#define TM_YEAR_OFFSET (1900)
const uint8_t _ytab[2][12] = {
{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
};
#define YEAR0 1900 /* the first year */
#define EPOCH_YR 1970 /* EPOCH = Jan 1 1970 00:00:00 */
#define SECS_DAY (24L * 60L * 60L)
#define LEAPYEAR(year) (!((year) % 4) && (((year) % 100) || !((year) % 400)))
#define YEARSIZE(year) (LEAPYEAR(year) ? 366 : 365)
/*
* convert epoch (in seconds) into a tm struct
* epoch_to_time is inspired from gmtime
*/
/* $Header: /opt/proj/minix/cvsroot/src/lib/ansi/gmtime.c,v 1.1.1.1 2005/04/21 14:56:05 beng Exp $ */
void epoch_to_time(struct tm *timep, const uint32_t epoch)
{
register unsigned long dayclock, dayno;
int year = EPOCH_YR;
dayclock = (unsigned long)epoch % SECS_DAY;
dayno = (unsigned long)epoch / SECS_DAY;
timep->tm_sec = dayclock % 60;
timep->tm_min = (dayclock % 3600) / 60;
timep->tm_hour = dayclock / 3600;
timep->tm_wday = (dayno + 4) % 7; /* day 0 was a thursday */
while (dayno >= YEARSIZE(year)) {
dayno -= YEARSIZE(year);
year++;
}
timep->tm_year = year - YEAR0;
timep->tm_yday = dayno;
timep->tm_mon = 0;
while (dayno >= _ytab[LEAPYEAR(year)][timep->tm_mon]) {
dayno -= _ytab[LEAPYEAR(year)][timep->tm_mon];
timep->tm_mon++;
}
timep->tm_mday = dayno + 1;
timep->tm_isdst = 0;
}
/*
* print a tm struct
*/
void print_time(const char *label, const struct tm *time)
{
DEBUG("%s %04d-%02d-%02d %02d:%02d:%02d
", label,
time->tm_year + TM_YEAR_OFFSET,
time->tm_mon + 1,
time->tm_mday,
time->tm_hour,
time->tm_min,
time->tm_sec);
}
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