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127 lines
4.4 KiB
C
127 lines
4.4 KiB
C
/*
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* $Id: wce_time.c,v 1.2 2006/04/09 16:48:18 mloskot Exp $
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*
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* Defines time() function.
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*
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* Created by Mateusz Loskot (mateusz@loskot.net)
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*
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* Copyright (c) 2006 Taxus SI Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH
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* THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* MIT License:
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* http://opensource.org/licenses/mit-license.php
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*
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* Contact:
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* Taxus SI Ltd.
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* http://www.taxussi.com.pl
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*
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*/
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#include <wce_time.h>
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#include <windows.h>
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/*******************************************************************************
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* wceex_time - Return the value of time in seconds since the Epoch.
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*
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* Description:
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* The timer argument points to an area where the return value is also stored.
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* If timer is a null pointer, no value is stored.
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*
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* Return:
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* Value of time if success, otherwise (time_t)-1 is returned.
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*
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* Reference:
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* IEEE Standard and an Open Group Technical Standard 1003.1, 2004 Edition
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*******************************************************************************/
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time_t wceex_time(time_t *timer)
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{
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time_t t;
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struct tm tmbuff;
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SYSTEMTIME st;
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/* Retrive current system date time as UTC */
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GetSystemTime(&st);
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/* Build tm struct based on SYSTEMTIME values */
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/* Date values */
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tmbuff.tm_year = st.wYear - TM_YEAR_BASE;
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tmbuff.tm_mon = st.wMonth - 1; /* wMonth value 1-12 */
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tmbuff.tm_mday = st.wDay;
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/* Time values */
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tmbuff.tm_hour = st.wHour;
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tmbuff.tm_min = st.wMinute;
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tmbuff.tm_sec = st.wSecond;
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tmbuff.tm_isdst = 0; /* Always 0 for UTC time. */
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tmbuff.tm_wday = st.wDayOfWeek;
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tmbuff.tm_yday = 0; /* Value is set by wceex_gmmktime */
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/* Convert tm struct to time_tUTC */
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t = wceex_gmmktime(&tmbuff);
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/* Assign time value. */
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if (timer != NULL)
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{
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*timer = t;
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}
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return t;
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}
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/*******************************************************************************
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* _wceex_tm_to_time_t - Convert time from tm struct format to time_t value.
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*
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* Description:
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* The tmbuff points to structure that contains broken-down time.
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* Input and output times are encoded as UTC.
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*
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* Return:
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* Specified time since the Epoch encoded as a value of type time_t.
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* (time_t)-1 is returned if time can not be represented by time_t.
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*
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* Reference:
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* IEEE Standard and an Open Group Technical Standard 1003.1, 2004 Edition
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*******************************************************************************/
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time_t __wceex_tm_to_time_t(const struct tm *tmbuff)
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{
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time_t timer;
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/* If the year is <1970 or the value is negative, the relationship is undefined */
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if (tmbuff->tm_year < 70)
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{
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return (time_t) -1;
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}
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/* If the year is >=1970 */
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/* Each and every day shall be accounted for by exactly 86400 seconds */
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timer = tmbuff->tm_sec
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+ tmbuff->tm_min * 60 /* convert minutes to seconds */
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+ tmbuff->tm_hour * 3600 /* convert hours to seconds */
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+ tmbuff->tm_yday * 86400 /* convert day of year to seconds */
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+ (tmbuff->tm_year - 70) * 31536000 /* convert year to seconds */
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+ ((tmbuff->tm_year - 69) / 4) * 86400 /* add a day (seconds) every 4 years starting in 1973 */
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- ((tmbuff->tm_year - 1) / 100) * 86400 /* subtract a day back out every 100 years starting in 2001 */
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+ ((tmbuff->tm_year + 299) / 400) * 86400; /* add a day back in every 400 years starting in 2001 */
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return timer;
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}
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