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553cb3ed46
sys/param.h was manually adjusted to not define __NetBSD_Version__ since it will be defined by the compiler.
89 lines
2.7 KiB
C
Vendored
89 lines
2.7 KiB
C
Vendored
/* $NetBSD: clock.h,v 1.4 2018/04/19 21:19:07 christos Exp $ */
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/*-
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* Copyright (c) 1996 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Gordon W. Ross
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _SYS_CLOCK_H_
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#define _SYS_CLOCK_H_
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/* Some handy constants. */
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#define SECS_PER_MINUTE 60
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#define SECS_PER_HOUR 3600
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#define SECS_PER_DAY 86400
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#define DAYS_PER_COMMON_YEAR 365
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#define DAYS_PER_LEAP_YEAR 366
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#define SECS_PER_COMMON_YEAR (SECS_PER_DAY * DAYS_PER_COMMON_YEAR)
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#define SECS_PER_LEAP_YEAR (SECS_PER_DAY * DAYS_PER_LEAP_YEAR)
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/* Traditional POSIX base year */
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#define POSIX_BASE_YEAR 1970
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/* Some handy functions */
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static __inline int
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days_in_month(int m)
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{
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switch (m) {
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case 2:
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return 28;
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case 4: case 6: case 9: case 11:
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return 30;
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case 1: case 3: case 5: case 7: case 8: case 10: case 12:
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return 31;
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default:
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return -1;
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}
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}
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/*
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* This inline avoids some unnecessary modulo operations
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* as compared with the usual macro:
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* ( ((year % 4) == 0 &&
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* (year % 100) != 0) ||
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* ((year % 400) == 0) )
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* It is otherwise equivalent.
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*/
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static __inline int
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is_leap_year(uint64_t year)
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{
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if ((year & 3) != 0)
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return 0;
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if (__predict_false((year % 100) != 0))
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return 1;
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return __predict_false((year % 400) == 0);
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}
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static __inline int
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days_per_year(uint64_t year)
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{
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return is_leap_year(year) ? DAYS_PER_LEAP_YEAR : DAYS_PER_COMMON_YEAR;
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}
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#endif /* _SYS_CLOCK_H_ */ |