142 lines
5.2 KiB
C
142 lines
5.2 KiB
C
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/****************************************************************************
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* lib/time/lib_mktime.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 <gnutt@nuttx.org>
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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 <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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* 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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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Function: mktime
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*
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* Description:
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* Time conversion (based on the POSIX API)
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*
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****************************************************************************/
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#ifdef CONFIG_GREGORIAN_TIME
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time_t mktime(const struct tm *tp)
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{
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time_t ret;
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time_t jdn;
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/* Get the EPOCH-relative julian date from the calendar year,
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* month, and date
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*/
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jdn = clock_calendar2utc(tp->tm_year+1900, tp->tm_mon+1, tp->tm_mday);
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sdbg("jdn=%d tm_year=%d tm_mon=%d tm_mday=%d\n",
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(int)jdn, tp->tm_year, tp->tm_mon, tp->tm_mday);
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/* Return the seconds into the julian day. */
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ret = ((jdn*24 + tp->tm_hour)*60 + tp->tm_min)*60 + tp->tm_sec;
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sdbg("ret=%d tm_hour=%d tm_min=%d tm_sec=%d\n",
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(int)ret, tp->tm_hour, tp->tm_min, tp->tm_sec);
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return ret;
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}
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#else
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/* Simple version that only works for dates within a (relatively) small range
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* from the epoch. It does not handle earlier days or longer days where leap
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* seconds, etc. apply.
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*/
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time_t mktime(const struct tm *tp)
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{
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unsigned int days;
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/* Years since epoch in units of days (ignoring leap years). */
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days = (tp->tm_year - 70) * 365;
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/* Add in the extra days for the leap years prior to the current year. */
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days += (tp->tm_year - 69) >> 2;
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/* Add in the days up to the beginning of this month. */
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days += (time_t)clock_daysbeforemonth(tp->tm_mon, clock_isleapyear(tp->tm_year + 1900));
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/* Add in the days since the beginning of this month (days are 1-based). */
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days += tp->tm_mday - 1;
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/* Then convert the seconds and add in hours, minutes, and seconds */
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return ((days * 24 + tp->tm_hour) * 60 + tp->tm_min) * 60 + tp->tm_sec;
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}
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#endif /* CONFIG_GREGORIAN_TIME */
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