/*FUNCTION****************************************************************
*
* Function Name : _real_time_to_sec
* Returned Value : none
* Comments :
* This function convert date to secs since 1.1.1970 0:0:0".
*
*END*********************************************************************/
static uint_32 _date_to_sec( DATE_STRUCT_PTR time )
{
#define SEC_IN_MIN 60
#define SEC_IN_HOUR 3600
#define SEC_IN_DAY 86400
#define FEBRUARY 2
#define ZERO_YEAR 1970
static const uint_16 days_no_table[]= { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
uint_32 days = 0;
uint_32 month;
uint_32 year;
days = 365 * (time->YEAR - ZERO_YEAR);
/* get leap year */
for( year = ZERO_YEAR; year < time->YEAR; year++)
{
days += _is_leap_year( year );
}
for( month = 1; month < time->MONTH; month++)
{
days+= days_no_table[month - 1];
/* is leap year? */
if( month == FEBRUARY )
{
days+= _is_leap_year( time->YEAR );
}
}
days += time->DAY-1;
return days*SEC_IN_DAY + time->HOUR*SEC_IN_HOUR + time->MINUTE*SEC_IN_MIN + time->SECOND;
}
/**
* For specified year, month and day of month, returns which day of that year
* it is.
*
* For example, given date 2011-01-03, the corresponding expression is:
* _day_of_year(111, 0, 3) == 2
*
* @param year Year (year 1900 = 0, can be negative).
* @param mon Month (January = 0).
* @param mday Day of month (First day is 1).
* @return Day of year (First day is 0).
*/
static int _day_of_year(time_t year, time_t mon, time_t mday)
{
static int mdays[] =
{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
static int leap_mdays[] =
{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335 };
return (_is_leap_year(year) ? leap_mdays[mon] : mdays[mon]) + mday - 1;
}
/**
* Week number of the year, assuming weeks start on monday.
* If the week containing January 1st has four or more days in the new year,
* then it is considered week 1. Otherwise, it is the last week of the previous
* year, and the next week is week 1. Both January 4th and the first Thursday
* of January are always in week 1.
*
* @param tm Normalized broken-down time.
* @return The week number (1 - 53).
*/
static int _iso_week_number(const struct posix_tm *tm)
{
int day = tm->tm_yday - _wbyear_offset(tm->tm_year);
if (day < 0) {
/* Last week of previous year. */
return 53;
}
if (day > 364 + _is_leap_year(tm->tm_year)) {
/* First week of next year. */
return 1;
}
/* All the other days give correct answer. */
return (day / 7 + 1);
}
/**
* Returns week-based year of the specified time.
*
* @param tm Normalized broken-down time.
* @return Week-based year.
*/
static int _wbyear(const struct posix_tm *tm)
{
int day = tm->tm_yday - _wbyear_offset(tm->tm_year);
if (day < 0) {
/* Last week of previous year. */
return tm->tm_year - 1;
}
if (day > 364 + _is_leap_year(tm->tm_year)) {
/* First week of next year. */
return tm->tm_year + 1;
}
/* All the other days are in the calendar year. */
return tm->tm_year;
}
/**
* Returns how many days there are in the given month of the given year.
* Note that year is only taken into account if month is February.
*
* @param year Year since 1900 (can be negative).
* @param mon Month of the year. 0 for January, 11 for December.
* @return Number of days in the specified month.
*/
static int _days_in_month(time_t year, time_t mon)
{
assert(mon >= 0 && mon <= 11);
static int month_days[] =
{ 31, 0, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
if (mon == 1) {
year += 1900;
/* february */
return _is_leap_year(year) ? 29 : 28;
} else {
return month_days[mon];
}
}
/** @memo Retrieve the current system date.
@doc Retrieves the current system date and returns it in the
storage location.
@precondition The baseReference must refer to a valid date.
@return 0 on success. -1 otherwise.
*/
int rtp_get_date (
RTP_DATE *date /** Storage location for the current system date. */
)
{
unsigned long deltaSecs;
*date = baseReference.referenceDate;
deltaSecs = rtp_get_system_sec() - baseReference.syncTime;
if (deltaSecs > 0)
{
date->second += deltaSecs;
date->second %= 60;
deltaSecs /= 60;
if (deltaSecs > 0)
{
date->minute += deltaSecs;
date->minute %= 60;
deltaSecs /= 60;
if (deltaSecs > 0)
{
date->hour += deltaSecs;
date->hour %= 24;
deltaSecs /= 24;
if (deltaSecs > 0)
{
int total_days;
date->day += deltaSecs;
date->day %= 24;
deltaSecs /= 24;
if (_is_leap_year(date->year))
{
total_days = month_start_leap[date->month] + date->day + deltaSecs;
}
else
{
total_days = month_start[date->month] + date->day + deltaSecs;
}
while (1)
{
if (_is_leap_year(date->year))
{
if (total_days < 366)
{
break;
}
total_days -= 366;
}
else
{
if (total_days < 365)
{
break;
}
total_days -= 365;
}
date->year++;
}
if (_is_leap_year(date->year))
{
for (date->month=0;
date->month < 11 && month_start_leap[date->month + 1] < total_days;
date->month++)
{;}
date->day = total_days - month_start_leap[date->month] + 1;
}
else
{
for (date->month=0;
date->month < 11 && month_start[date->month + 1] < total_days;
date->month++)
{;}
date->day = total_days - month_start[date->month] + 1;
}
date->month++;
}
}
}
}
return (0);
}
/**
* Normalizes the broken-down time and optionally adds specified amount of
* seconds.
*
* @param tm Broken-down time to normalize.
* @param sec_add Seconds to add.
* @return 0 on success, -1 on overflow
*/
static int _normalize_time(struct posix_tm *tm, time_t sec_add)
{
// TODO: DST correction
/* Set initial values. */
time_t sec = tm->tm_sec + sec_add;
time_t min = tm->tm_min;
time_t hour = tm->tm_hour;
time_t day = tm->tm_mday - 1;
time_t mon = tm->tm_mon;
time_t year = tm->tm_year;
/* Adjust time. */
min += _floor_div(sec, SECS_PER_MIN);
sec = _floor_mod(sec, SECS_PER_MIN);
hour += _floor_div(min, MINS_PER_HOUR);
min = _floor_mod(min, MINS_PER_HOUR);
day += _floor_div(hour, HOURS_PER_DAY);
hour = _floor_mod(hour, HOURS_PER_DAY);
/* Adjust month. */
year += _floor_div(mon, 12);
mon = _floor_mod(mon, 12);
/* Now the difficult part - days of month. */
/* First, deal with whole cycles of 400 years = 146097 days. */
year += _floor_div(day, 146097) * 400;
day = _floor_mod(day, 146097);
/* Then, go in one year steps. */
if (mon <= 1) {
/* January and February. */
while (day > 365) {
day -= _is_leap_year(year) ? 366 : 365;
year++;
}
} else {
/* Rest of the year. */
while (day > 365) {
day -= _is_leap_year(year + 1) ? 366 : 365;
year++;
}
}
/* Finally, finish it off month per month. */
while (day >= _days_in_month(year, mon)) {
day -= _days_in_month(year, mon);
mon++;
if (mon >= 12) {
mon -= 12;
year++;
}
}
/* Calculate the remaining two fields. */
tm->tm_yday = _day_of_year(year, mon, day + 1);
tm->tm_wday = _day_of_week(year, mon, day + 1);
/* And put the values back to the struct. */
tm->tm_sec = (int) sec;
tm->tm_min = (int) min;
tm->tm_hour = (int) hour;
tm->tm_mday = (int) day + 1;
tm->tm_mon = (int) mon;
/* Casts to work around libc brain-damage. */
if (year > ((int)INT_MAX) || year < ((int)INT_MIN)) {
tm->tm_year = (year < 0) ? ((int)INT_MIN) : ((int)INT_MAX);
return -1;
}
tm->tm_year = (int) year;
return 0;
}
