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engines/ags/lib/system/datetime.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 "ags/lib/system/datetime.h"
+
+namespace AGS3 {
+
+/*
+ * Converts a date/time structure to Unix timestamp
+ * @author Oryx Embedded SARL (www.oryx-embedded.com)
+ * @version 2.0.0
+ */
+time_t convertDateToUnixTime(const TimeDate *date) {
+	uint y;
+	uint m;
+	uint d;
+	time_t t;
+
+	// Year
+	y = date->tm_year;
+	// Month of year
+	m = date->tm_mon;
+	// Day of month
+	d = date->tm_mday;
+
+	// January and February are counted as months 13 and 14 of the previous year
+	if (m <= 2) {
+		m += 12;
+		y -= 1;
+	}
+
+	// Convert years to days
+	t = (365 * y) + (y / 4) - (y / 100) + (y / 400);
+	// Convert months to days
+	t += (30 * m) + (3 * (m + 1) / 5) + d;
+	// Unix time starts on January 1st, 1970
+	t -= 719561;
+	// Convert days to seconds
+	t *= 86400;
+	// Add hours, minutes and seconds
+	t += (3600 * date->tm_hour) + (60 * date->tm_min) + date->tm_sec;
+
+	// Return Unix time
+	return t;
+}
+
+void localTime(tm *time) {
+	g_system->getTimeAndDate(*time);
+
+	time->tm_yday = 0;
+	time->tm_isdst = 0;
+}
+
+time_t getUnixTime() {
+	tm time;
+	localTime(&time);
+
+	return convertDateToUnixTime(&time);
+}
+
+} // namespace AGS3