profuse/DateTime.cpp
ksherlock 560f1b56fa c++ cleanups
git-svn-id: https://profuse.googlecode.com/svn/trunk@50 aa027e90-d47c-11dd-86d7-074df07e0730
2009-09-03 23:37:27 +00:00

145 lines
3.0 KiB
C++

#include "DateTime.h"
#include <cstdio>
#include <ctime>
#include <cstring>
namespace ProDOS {
/*
* date is a 16 bit value:
*
* 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
* +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
* | Year | Month | Day |
* +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
*
* time is a 16 bit value:
*
* 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
* +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
* |0 0 0| Hour | |0 0| Minute |
* +-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+
*
*/
/*
* ProDOS technote 28
*
* The following definition allows the same range of years that the Apple IIgs
* Control Panel CDA currently does:
*
* o A seven-bit ProDOS year value is in the range 0 to 99
* (100 through 127 are invalid)
* o Year values from 40 to 99 represent 1940 through 1999
* o Year values from 0 to 39 represent 2000 through 2039
*/
DateTime::DateTime() :
_yymmdd(0), _hhmm(0)
{
init(std::time(NULL));
}
DateTime::DateTime(uint32_t dtm) :
_yymmdd((dtm >> 16) & 0xff), _hhmm(dtm & 0xff)
{
}
DateTime::DateTime(unsigned yymmdd, unsigned hhmm) :
_yymmdd(yymmdd), _hhmm(hhmm)
{
}
DateTime::DateTime(std::time_t time) :
_yymmdd(0), _hhmm(0)
{
init(time);
}
DateTime::DateTime(unsigned year, unsigned month, unsigned day,
unsigned hour, unsigned minute) :
_yymmdd(0), _hhmm(0)
{
init(year, month, day, hour, minute);
}
void DateTime::init(std::time_t time)
{
tm t;
::localtime_r(&time, &t);
init(t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, t.tm_hour, t.tm_min);
}
void DateTime::init(unsigned year, unsigned month, unsigned day, unsigned hour, unsigned minute)
{
//printf("%d %d %d %d %d\n", year, month, day, hour, minute);
// 1940 is the earliest year, so clamp to 1940-01-01 00:00
if (year < 1940)
{
_yymmdd = (40 << 9) | (1 << 5) | 1;
_hhmm = 0;
return;
}
// 2039 is the latest year, so clamp to 2039-12-31 23:59
if (year > 2039)
{
_yymmdd = (39 << 9) | (12 << 5) | 31;
_hhmm = (23 << 8) | 59;
return;
}
if (year >= 2000) year -= 2000;
else year -= 1900;
_hhmm = minute | (hour << 8);
_yymmdd = day | (month << 5) | (year << 9);
}
unsigned DateTime::year() const
{
unsigned tmp = _yymmdd >> 9;
//if (tmp > 100) return 0;
if (tmp <= 39) tmp += 100;
return tmp + 1900;
}
/*
* A positive or 0 value for tm_isdst causes mktime() to presume initially
* that Daylight Savings Time, respectively, is or is not in effect for
* the specified time. A negative value for tm_isdst causes mktime() to
* attempt to determine whether Daylight Saving Time is in effect for the
* specified time.
*/
std::time_t DateTime::toUnix() const
{
tm t;
if (_yymmdd == 0) return 0;
std::memset(&t, 0, sizeof(tm));
t.tm_min = minute();
t.tm_hour = hour();
t.tm_isdst = -1;
t.tm_mday = day();
t.tm_mon = month() - 1;
t.tm_year = year() - 1900;
return std::mktime(&t);
// convert back via locatime & fudge for dst?
}
} // namespace