Code imported from NetBSD. -moj

2 files changed, 234 insertions, 0 deletions

diff --git a/sys/dev/clock_subr.c b/sys/dev/clock_subr.c
new file mode 100644
index 00000000000..e7f080d7f0e
--- /dev/null
+++ b/sys/dev/clock_subr.c
@@ -0,0 +1,169 @@
+/*	$OpenBSD: clock_subr.c,v 1.1 1997/09/09 13:08:18 maja 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. 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>
+
+/* Traditional POSIX base year */
+#define	POSIX_BASE_YEAR	1970
+
+static inline int leapyear __P((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(year)
+	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(dt)
+	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(secs, dt)
+	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;
+}
diff --git a/sys/dev/clock_subr.h b/sys/dev/clock_subr.h
new file mode 100644
index 00000000000..0726cdaf52c
--- /dev/null
+++ b/sys/dev/clock_subr.h
@@ -0,0 +1,65 @@
+/*	$OpenBSD: clock_subr.h,v 1.1 1997/09/09 13:08:18 maja Exp $	*/
+/*	$NetBSD: clock_subr.h,v 1.2 1997/03/15 18:11:17 is Exp $	*/
+
+/*-
+ * Copyright (c) 1996 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Gordon W. Ross
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *        This product includes software developed by the NetBSD
+ *        Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+/*
+ * "POSIX time" to/from "YY/MM/DD/hh/mm/ss"
+ */
+struct clock_ymdhms {
+	u_short dt_year;
+	u_char dt_mon;
+	u_char dt_day;
+	u_char dt_wday;	/* Day of week */
+	u_char dt_hour;
+	u_char dt_min;
+	u_char dt_sec;
+};
+
+time_t clock_ymdhms_to_secs __P((struct clock_ymdhms *));
+void clock_secs_to_ymdhms __P((time_t, struct clock_ymdhms *));
+
+/*
+ * BCD to decimal and decimal to BCD.
+ */
+#define	FROMBCD(x)	(((x) >> 4) * 10 + ((x) & 0xf))
+#define	TOBCD(x)	(((x) / 10 * 16) + ((x) % 10))
+
+/* Some handy constants. */
+#define SECDAY		86400L
+#define SECYR		(SECDAY * 365)
+