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