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141 lines
5.2 KiB
141 lines
5.2 KiB
/**************************************************************************** |
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* libc/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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