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/**
* @file
*
* @brief TOD to Seconds
* @ingroup ClassicClock
*/
/*
* COPYRIGHT (c) 1989-2007.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/rtems/clock.h>
#include <rtems/score/todimpl.h>
#define TOD_SECONDS_AT_2100_03_01_00_00 4107538800UL
/*
* The following array contains the number of days in all months
* up to the month indicated by the index of the second dimension.
* The first dimension should be 1 for leap years, and 0 otherwise.
*/
const uint16_t _TOD_Days_to_date[2][13] = {
{ 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 },
{ 0, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335 }
};
/*
* The following array contains the number of days in the years
* since the last leap year. The index should be 0 for leap
* years, and the number of years since the beginning of a leap
* year otherwise.
*/
const uint16_t _TOD_Days_since_last_leap_year[4] = { 0, 366, 731, 1096 };
uint32_t _TOD_To_seconds(
const rtems_time_of_day *the_tod
)
{
uint32_t time;
uint32_t year_mod_4;
time = the_tod->day - 1;
year_mod_4 = the_tod->year & 3;
if ( year_mod_4 == 0 )
time += _TOD_Days_to_date[ 1 ][ the_tod->month ];
else
time += _TOD_Days_to_date[ 0 ][ the_tod->month ];
time += ( (the_tod->year - TOD_BASE_YEAR) / 4 ) *
( (TOD_DAYS_PER_YEAR * 4) + 1);
time += _TOD_Days_since_last_leap_year[ year_mod_4 ];
time *= TOD_SECONDS_PER_DAY;
time += ((the_tod->hour * TOD_MINUTES_PER_HOUR) + the_tod->minute)
* TOD_SECONDS_PER_MINUTE;
time += the_tod->second;
/* The year 2100 is not a leap year */
if ( time
>= (TOD_SECONDS_AT_2100_03_01_00_00 - TOD_SECONDS_1970_THROUGH_1988)) {
time -= TOD_SECONDS_PER_DAY;
}
time += TOD_SECONDS_1970_THROUGH_1988;
return( time );
}
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