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engines/glk/time.cpp

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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "glk/time.h"
+#include "common/system.h"
+
+namespace Glk {
+
+TimeAndDate::TimeAndDate() {
+	::TimeDate t;
+	g_system->getTimeAndDate(t);
+
+	year = t.tm_year;
+	month = t.tm_mon;
+	day = t.tm_mday;
+	weekday = t.tm_wday;
+	hour = t.tm_hour;
+	minute = t.tm_min;
+	second = t.tm_sec;
+	microsec = 0;
+}
+
+TimeAndDate::TimeAndDate(const TimeSeconds &ts) {
+	setTime(ts);
+}
+
+TimeAndDate::TimeAndDate(const Timestamp &t) {
+	setTime(((int64)t.high_sec << 32) | t.low_sec);
+}
+
+TimeAndDate::operator TimeSeconds() const {
+	return getTime();
+}
+
+TimeAndDate::operator Timestamp() const {
+	TimeSeconds secs = getTime();
+	Timestamp ts;
+	ts.high_sec = secs >> 32;
+	ts.low_sec = secs & 0xffffffff;
+	ts.microsec = 0;
+
+	return ts;
+}
+
+void TimeAndDate::setTime(const TimeSeconds &ts) {
+	TimeSeconds total = ts;
+	int daysInYear = 0, secsInYear = 0;
+
+	// Figure out the year
+	this->year = 1969;
+	do {
+		++this->year;
+		total -= secsInYear;
+
+		daysInYear = ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0)) ? 366 : 365;
+		secsInYear = daysInYear * 24 * 60 * 60;
+	} while (total >= secsInYear);
+
+	// Figure out month and day
+	int dayInYear = total / (24 * 60 * 60);
+	total %= 24 * 60 * 60;
+
+	int MONTH_DAYS[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+	this->month = 1;
+	while (dayInYear >= MONTH_DAYS[this->month - 1]) {
+		dayInYear -= MONTH_DAYS[this->month - 1];
+		this->month++;
+	}
+
+	this->day = dayInYear + 1;
+
+	// set the time within the day
+	this->hour = total / (60 * 60);
+	total %= (60 * 60);
+	this->minute = total / 60;
+	this->second = total % 60;
+	this->microsec = 0;
+}
+
+TimeSeconds TimeAndDate::getTime() const {
+	uint32 days = day - 1;
+	for (int i = 1970; i < year; ++i)
+		if ((i % 4 == 0 && i % 100 != 0) || (i % 400 == 0))
+			days += 366;
+		else
+			days += 365;
+
+	int mdays[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+	for (int i = 1; i < month; ++i) {
+		days += mdays[i - 1];
+		if (i == 2)
+			if ((year % 4 == 0 && year % 100 != 0) || (year % 400 == 0))
+				days += 1;
+	}
+
+	int64 totalHours = days * 24 + hour;
+	int64 totalMinutes = totalHours * 60 + minute;
+	return totalMinutes * 60 + second;
+}
+
+} // End of namespace Glk