|
|
/****************************************************************************
* include/nuttx/time.h
*
* Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 NuttX 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 COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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 __INCLUDE_NUTTX_TIME_H
#define __INCLUDE_NUTTX_TIME_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdbool.h>
#include <time.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* If Gregorian time is not supported, then neither is Julian */
#ifndef CONFIG_GREGORIAN_TIME
# undef CONFIG_JULIAN_TIME
#else
# define JD_OF_EPOCH 2440588 /* Julian Date of noon, J1970 */
# ifdef CONFIG_JULIAN_TIME
# define GREG_DUTC -141427 /* Default is October 15, 1582 */
# define GREG_YEAR 1582
# define GREG_MONTH 10
# define GREG_DAY 15
# endif /* CONFIG_JULIAN_TIME */
#endif /* !CONFIG_GREGORIAN_TIME */
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
/****************************************************************************
* Function: clock_isleapyear
*
* Description:
* Return true if the specified year is a leap year
*
****************************************************************************/
EXTERN int clock_isleapyear(int year);
/****************************************************************************
* Function: clock_daysbeforemonth
*
* Description:
* Get the number of days that occurred before the beginning of the month.
*
****************************************************************************/
EXTERN int clock_daysbeforemonth(int month, bool leapyear);
/****************************************************************************
* Function: clock_calendar2utc
*
* Description:
* Calendar/UTC conversion based on algorithms from p. 604
* of Seidelman, P. K. 1992. Explanatory Supplement to
* the Astronomical Almanac. University Science Books,
* Mill Valley.
*
****************************************************************************/
EXTERN time_t clock_calendar2utc(int year, int month, int day);
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __INCLUDE_NUTTX_TIME_H */
|
