move clock_subr.c to a better place, and now it is always in the kernel

so that things can use it; tested on all architectures; ok kettenis

1 files changed, 158 insertions, 0 deletions

diff --git a/sys/kern/clock_subr.c b/sys/kern/clock_subr.c
new file mode 100644
index 00000000000..b661121c6af
--- /dev/null
+++ b/sys/kern/clock_subr.c
@@ -0,0 +1,158 @@
+/*	$OpenBSD: clock_subr.c,v 1.1 2006/06/19 15:13:35 deraadt Exp $	*/
+/*	$NetBSD: clock_subr.c,v 1.3 1997/03/15 18:11:16 is Exp $	*/
+
+/*
+ * Copyright (c) 1988 University of Utah.
+ * Copyright (c) 1982, 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * the Systems Programming Group of the University of Utah Computer
+ * Science Department.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * from: Utah $Hdr: clock.c 1.18 91/01/21$
+ *
+ *	@(#)clock.c	8.2 (Berkeley) 1/12/94
+ */
+
+/*
+ * Generic routines to convert between a POSIX date
+ * (seconds since 1/1/1970) and yr/mo/day/hr/min/sec
+ * Derived from arch/hp300/hp300/clock.c
+ */
+
+#include <sys/types.h>
+#include <sys/systm.h>
+
+#include <dev/clock_subr.h>
+
+static inline int leapyear(int year);
+#define FEBRUARY	2
+#define	days_in_year(a) 	(leapyear(a) ? 366 : 365)
+#define	days_in_month(a) 	(month_days[(a) - 1])
+
+static const int month_days[12] = {
+	31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+};
+
+/*
+ * This inline avoids some unnecessary modulo operations
+ * as compared with the usual macro:
+ *   ( ((year % 4) == 0 &&
+ *      (year % 100) != 0) ||
+ *     ((year % 400) == 0) )
+ * It is otherwise equivalent.
+ */
+static inline int
+leapyear(int year)
+{
+	int rv = 0;
+
+	if ((year & 3) == 0) {
+		rv = 1;
+		if ((year % 100) == 0) {
+			rv = 0;
+			if ((year % 400) == 0)
+				rv = 1;
+		}
+	}
+	return (rv);
+}
+
+time_t
+clock_ymdhms_to_secs(struct clock_ymdhms *dt)
+{
+	time_t secs;
+	int i, year, days;
+
+	year = dt->dt_year;
+
+	/*
+	 * Compute days since start of time
+	 * First from years, then from months.
+	 */
+	days = 0;
+	for (i = POSIX_BASE_YEAR; i < year; i++)
+		days += days_in_year(i);
+	if (leapyear(year) && dt->dt_mon > FEBRUARY)
+		days++;
+
+	/* Months */
+	for (i = 1; i < dt->dt_mon; i++)
+	  	days += days_in_month(i);
+	days += (dt->dt_day - 1);
+
+	/* Add hours, minutes, seconds. */
+	secs = ((days
+	    * 24 + dt->dt_hour)
+	    * 60 + dt->dt_min)
+	    * 60 + dt->dt_sec;
+
+	return (secs);
+}
+
+/* This function uses a copy of month_days[] */
+#undef	days_in_month
+#define	days_in_month(a) 	(mthdays[(a) - 1])
+
+void
+clock_secs_to_ymdhms(time_t secs, struct clock_ymdhms *dt)
+{
+	int mthdays[12];
+	int i, days;
+	int rsec;	/* remainder seconds */
+
+	bcopy(month_days, mthdays, sizeof(mthdays));
+
+	days = secs / SECDAY;
+	rsec = secs % SECDAY;
+
+	/* Day of week (Note: 1/1/1970 was a Thursday) */
+	dt->dt_wday = (days + 4) % 7;
+
+	/* Subtract out whole years, counting them in i. */
+	for (i = POSIX_BASE_YEAR; days >= days_in_year(i); i++)
+		days -= days_in_year(i);
+	dt->dt_year = i;
+
+	/* Subtract out whole months, counting them in i. */
+	if (leapyear(i))
+		days_in_month(FEBRUARY) = 29;
+	for (i = 1; days >= days_in_month(i); i++)
+		days -= days_in_month(i);
+	dt->dt_mon = i;
+
+	/* Days are what is left over (+1) from all that. */
+	dt->dt_day = days + 1;
+
+	/* Hours, minutes, seconds are easy */
+	dt->dt_hour = rsec / 3600;
+	rsec = rsec % 3600;
+	dt->dt_min  = rsec / 60;
+	rsec = rsec % 60;
+	dt->dt_sec  = rsec;
+}