[src/trunk]: src/sys/sys PR/49207: Kamil Rytarowski: Centralize and rename a ...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/841194db8f3a
branches:  trunk
changeset: 333805:841194db8f3a
user:      christos <christos%NetBSD.org@localhost>
date:      Mon Nov 17 02:27:26 2014 +0000

description:
PR/49207: Kamil Rytarowski: Centralize and rename a bunch of clock constants
and inline functions.

diffstat:

 sys/sys/clock.h |  91 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 91 insertions(+), 0 deletions(-)

diffs (95 lines):

diff -r 8e1a8206e80e -r 841194db8f3a sys/sys/clock.h
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/sys/clock.h   Mon Nov 17 02:27:26 2014 +0000
@@ -0,0 +1,91 @@
+/*     $NetBSD: clock.h,v 1.1 2014/11/17 02:27:26 christos 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.
+ *
+ * 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.
+ */
+
+#ifndef _SYS_CLOCK_H_
+#define _SYS_CLOCK_H_
+
+/* Some handy constants. */
+#define SECS_PER_MINUTE                60
+#define SECS_PER_HOUR          3600
+#define SECS_PER_DAY           86400
+#define DAYS_PER_COMMON_YEAR    365
+#define DAYS_PER_LEAP_YEAR      366
+#define SECS_PER_COMMON_YEAR   (SECS_PER_DAY * DAYS_PER_COMMON_YEAR)
+#define SECS_PER_LEAP_YEAR     (SECS_PER_DAY * DAYS_PER_LEAP_YEAR)
+
+/* Traditional POSIX base year */
+#define        POSIX_BASE_YEAR 1970
+
+/* Some handy functions */
+static inline int
+days_in_month(int m)
+{
+       static const int month_days[12] = {
+               31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
+       };
+
+       if (__predict_false(m < 1 || m > 12))
+               return EINVAL;
+
+       return month_days[m - 1];
+}
+
+/*
+ * 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
+is_leap_year(uint64_t year)
+{
+       int rv = 0;
+
+       if ((year & 3) == 0) {
+               rv = 1;
+               if (__predict_false((year % 100) == 0)) {
+                       rv = 0;
+                       if (__predict_false((year % 400) == 0))
+                               rv = 1;
+               }
+       }
+       return rv;
+}
+
+static inline int
+days_per_year(uint64_t year)
+{
+       return is_leap_year(year) ? DAYS_PER_LEAP_YEAR : DAYS_PER_COMMON_YEAR;
+}
+
+#endif /* _SYS_CLOCK_H_ */