patch-2.4.0-test9 linux/include/linux/time.h

• Lines: 44
• Date: Mon Oct 2 11:01:17 2000
• Orig file: v2.4.0-test8/linux/include/linux/time.h
• Orig date: Fri Sep 8 12:52:41 2000

diff -u --recursive --new-file v2.4.0-test8/linux/include/linux/time.h linux/include/linux/time.h
@@ -45,7 +45,42 @@
 	value->tv_nsec = (jiffies % HZ) * (1000000000L / HZ);
 	value->tv_sec = jiffies / HZ;
 }
- 
+
+
+/* Converts Gregorian date to seconds since 1970-01-01 00:00:00.
+ * Assumes input in normal date format, i.e. 1980-12-31 23:59:59
+ * => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
+ *
+ * [For the Julian calendar (which was used in Russia before 1917,
+ * Britain & colonies before 1752, anywhere else before 1582,
+ * and is still in use by some communities) leave out the
+ * -year/100+year/400 terms, and add 10.]
+ *
+ * This algorithm was first published by Gauss (I think).
+ *
+ * WARNING: this function will overflow on 2106-02-07 06:28:16 on
+ * machines were long is 32-bit! (However, as time_t is signed, we
+ * will already get problems at other places on 2038-01-19 03:14:08)
+ */
+static inline unsigned long
+mktime (unsigned int year, unsigned int mon,
+	unsigned int day, unsigned int hour,
+	unsigned int min, unsigned int sec)
+{
+	if (0 >= (int) (mon -= 2)) {	/* 1..12 -> 11,12,1..10 */
+		mon += 12;		/* Puts Feb last since it has leap day */
+		year -= 1;
+	}
+
+	return (((
+		(unsigned long) (year/4 - year/100 + year/400 + 367*mon/12 + day) +
+			year*365 - 719499
+	    )*24 + hour /* now have hours */
+	  )*60 + min /* now have minutes */
+	)*60 + sec; /* finally seconds */
+}
+
+
 struct timeval {
 	time_t		tv_sec;		/* seconds */
 	suseconds_t	tv_usec;	/* microseconds */