210 lines
6.3 KiB
C
210 lines
6.3 KiB
C
/****************************************************************************
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* lib/time/lib_calendar2utc.c
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*
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* Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdbool.h>
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#include <time.h>
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#include <debug.h>
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#include <nuttx/time.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Type Declarations
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Public Constant Data
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****************************************************************************/
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/****************************************************************************
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* Public Variables
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****************************************************************************/
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Function: clock_gregorian2utc, clock_julian2utc
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*
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* Description:
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* UTC conversion routines. These conversions are based
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* on algorithms from p. 604 of Seidelman, P. K. 1992.
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* Explanatory Supplement to the Astronomical Almanac.
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* University Science Books, Mill Valley.
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*
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****************************************************************************/
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#ifdef CONFIG_GREGORIAN_TIME
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static time_t clock_gregorian2utc(int year, int month, int day)
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{
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int temp;
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/* temp = (month - 14)/12; */
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temp = (month <= 2 ? -1:0);
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return (1461*(year + 4800 + temp))/4
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+ (367*(month - 2 - 12*temp))/12
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- (3*((year + 4900 + temp)/100))/4 + day - 32075;
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}
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#ifdef CONFIG_JULIAN_TIME
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static time_t clock_julian2utc(int year, int month, int day)
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{
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return 367*year
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- (7*(year + 5001 + (month-9)/7))/4
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+ (275*month)/9
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+ day + 1729777;
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}
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#endif /* CONFIG_JULIAN_TIME */
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#endif /* CONFIG_GREGORIAN_TIME */
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: clock_calendar2utc
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*
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* Description:
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* Calendar/UTC conversion based on algorithms from p. 604
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* of Seidelman, P. K. 1992. Explanatory Supplement to
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* the Astronomical Almanac. University Science Books,
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* Mill Valley.
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*
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****************************************************************************/
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#ifdef CONFIG_GREGORIAN_TIME
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time_t clock_calendar2utc(int year, int month, int day)
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{
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int dyear;
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#ifdef CONFIG_JULIAN_TIME
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bool isgreg;
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#endif /* CONFIG_JULIAN_TIME */
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/* Correct year & month ranges. Shift month into range 1-12 */
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dyear = (month-1) / 12;
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month -= 12 * dyear;
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year += dyear;
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if (month < 1)
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{
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month += 12;
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year -= 1;
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}
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#ifdef CONFIG_JULIAN_TIME
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/* Determine which calendar to use */
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if (year > GREG_YEAR)
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{
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isgreg = true;
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}
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else if (year < GREG_YEAR)
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{
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isgreg = false;
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}
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else if (month > GREG_MONTH)
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{
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isgreg = true;
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}
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else if (month < GREG_MONTH)
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{
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isgreg = false;
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}
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else
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{
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isgreg = (day >= GREG_DAY);
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}
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/* Calculate and return date */
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if (isgreg)
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{
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return clock_gregorian2utc(year, month, day) - JD_OF_EPOCH;
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}
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else
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{
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return clock_julian2utc (year, month, day) - JD_OF_EPOCH;
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}
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#else /* CONFIG_JULIAN_TIME */
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return clock_gregorian2utc(year, month, day) - JD_OF_EPOCH;
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#endif /* CONFIG_JULIAN_TIME */
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}
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#else
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/* A highly simplified version that only handles days in the time
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* since Jan 1, 1970.
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*/
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time_t clock_calendar2utc(int year, int month, int day)
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{
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struct tm t;
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/* mktime can (kind of) do this */
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t.tm_year = year;
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t.tm_mon = month;
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t.tm_mday = day;
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t.tm_hour = 0;
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t.tm_min = 0;
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t.tm_sec = 0;
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return mktime(&t);
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}
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#endif /* CONFIG_GREGORIAN_TIME */
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