1 files changed, 72 insertions, 0 deletions
diff --git a/src/mktime.c b/src/mktime.c
new file mode 100644
index 00000000..78b88c2f
--- /dev/null
+++ b/src/mktime.c
@@ -0,0 +1,72 @@
+/*
+ * mktime.c -- converts a struct tm into a time_t
+ *
+ * Copyright (C) 1997 Free Software Foundation, Inc.
+ *
+ * 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 2, 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, write to the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
+/* Written by Philippe De Muyter <phdm@macqel.be>.  */
+
+#include	<time.h>
+
+static time_t mkgmtime(register struct tm *t)
+{
+    register short month, year;
+    register time_t result;
+    static int m_to_d[12] =
+    {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
+
+    month = t->tm_mon;
+    year = t->tm_year + month / 12 + 1900;
+    month %= 12;
+    if (month < 0) {
+	year -= 1;
+	month += 12;
+    }
+    result = (year - 1970) * 365 + m_to_d[month];
+    if (month <= 1)
+	year -= 1;
+    result += (year - 1968) / 4;
+    result -= (year - 1900) / 100;
+    result += (year - 1600) / 400;
+    result += t->tm_mday;
+    result -= 1;
+    result *= 24;
+    result += t->tm_hour;
+    result *= 60;
+    result += t->tm_min;
+    result *= 60;
+    result += t->tm_sec;
+    return (result);
+}
+
+/*
+ *  mktime -- convert tm struct to time_t
+ *		if tm_isdst >= 0 use it, else compute it
+ */
+
+time_t
+mktime(struct tm * t)
+{
+    time_t result;
+
+    tzset();
+    result = mkgmtime(t) + timezone;
+    if (t->tm_isdst > 0
+	|| (t->tm_isdst < 0 && localtime(&result)->tm_isdst))
+	result -= 3600;
+    return (result);
+}