c55dab446f
git-svn-id: https://svn.code.sf.net/p/flaim/code/trunk@7 0109f412-320b-0410-ab79-c3e0c5ffbbe6
336 lines
10 KiB
C++
336 lines
10 KiB
C++
//------------------------------------------------------------------------------
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// Desc: Date and time functions
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//
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// Tabs: 3
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//
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// Copyright (c) 1991-2000, 2002-2003,2005-2006 Novell, Inc. All Rights Reserved.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of version 2 of the GNU General Public
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// License as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, contact Novell, Inc.
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//
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// To contact Novell about this file by physical or electronic mail,
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// you may find current contact information at www.novell.com
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//
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// $Id: ftktime.cpp 3115 2006-01-19 13:24:39 -0700 (Thu, 19 Jan 2006) dsanders $
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//------------------------------------------------------------------------------
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#include "flaimsys.h"
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#define BASEYR 1970 /* all gmt calcs done since 1970 */
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#define SECONDSPERDAY 86400l /* 24 hours * 60 minutes * 60 seconds */
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#define SECONDSPERHOUR 3600 /* 60 minutes * 60 seconds */
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#define DDAYSPERYEAR 365 /* 365 days/year */
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static FLMUINT8 ui8NumDaysPerMonth[2][12] = { /* days of the months */
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{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
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{31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31} };
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static FLMUINT16 ui16NumDaysFromJan1st[2][12] = {
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/* current total of the days in the year by mon */
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{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334},
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{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335} };
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static F_TMSTAMP maxdate =
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{ 2106, 1, 6, 11, 0, 0, 0 };
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static FLMUINT f_timeLeapYearsSince1970(
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FLMUINT16 year);
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/****************************************************************************
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Desc: Gets the number of seconds since 1980 or 1970.
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****************************************************************************/
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void f_timeGetSeconds(
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FLMUINT * puiSeconds)
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{
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#if defined( FLM_WIN)
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*puiSeconds = (FLMUINT) time( NULL);
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#elif defined( FLM_UNIX) || defined( FLM_NLM)
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*puiSeconds = (FLMUINT) time( 0);
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#else
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#error Platform not supported
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#endif
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}
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/****************************************************************************
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Desc: Gets the time stamp from the system clock.
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Notes:
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****************************************************************************/
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void f_timeGetTimeStamp(
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F_TMSTAMP * pTimeStamp)
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{
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#if defined( FLM_WIN)
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SYSTEMTIME rightnow;
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GetLocalTime( &rightnow );
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pTimeStamp->year = rightnow.wYear;
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pTimeStamp->month = (FLMUINT8)(rightnow.wMonth - 1);
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pTimeStamp->day = (FLMUINT8)rightnow.wDay;
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pTimeStamp->hour = (FLMUINT8)rightnow.wHour;
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pTimeStamp->minute = (FLMUINT8)rightnow.wMinute;
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pTimeStamp->second = (FLMUINT8)rightnow.wSecond;
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pTimeStamp->hundredth = rightnow.wMilliseconds / 10;
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#elif defined( FLM_UNIX) || defined( FLM_NLM)
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time_t now;
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struct tm rightnow;
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now = time( (time_t *) 0 );
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(void)localtime_r( &now, &rightnow );
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pTimeStamp->year = rightnow.tm_year + 1900;
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pTimeStamp->month = rightnow.tm_mon;
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pTimeStamp->day = rightnow.tm_mday;
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pTimeStamp->hour = rightnow.tm_hour;
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pTimeStamp->minute = rightnow.tm_min;
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pTimeStamp->second = rightnow.tm_sec;
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pTimeStamp->hundredth = 0;
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#else
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#error Platform not supported
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#endif
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}
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/****************************************************************************
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Desc: Returns the local time bias in seconds
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****************************************************************************/
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FLMINT f_timeGetLocalOffset( void)
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{
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FLMINT iOffset = 0;
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#if defined( FLM_WIN)
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TIME_ZONE_INFORMATION tzInfo;
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DWORD retVal;
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retVal = GetTimeZoneInformation( &tzInfo);
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if( retVal != TIME_ZONE_ID_UNKNOWN)
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{
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iOffset =
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(retVal == TIME_ZONE_ID_DAYLIGHT && tzInfo.DaylightDate.wMonth
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? tzInfo.Bias + tzInfo.DaylightBias
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: tzInfo.Bias) * 60;
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}
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#elif defined( FLM_UNIX) || defined( FLM_NLM)
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time_t gmtTime;
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time_t localTime;
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struct tm gmtTm;
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gmtTime = time( (time_t *)0);
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gmtime_r( &gmtTime, &gmtTm);
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localTime = mktime( &gmtTm);
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iOffset = (FLMINT)((FLMINT64)localTime - (FLMINT64)gmtTime);
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#else
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#error Platform not supported
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#endif
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return( iOffset);
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}
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/****************************************************************************
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Desc: Count the number of leap years from 1970 to given year.
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In: year - FLMUINT16 value containing the year
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Out: (None)
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Ret: Number of leap years since 1970
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Notes: According to the Gregorian calendar (which we currently use), the
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year is a leap year if it is divisible by 4, unless it is a century
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year, then it must be divisible by 400.
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****************************************************************************/
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static FLMUINT f_timeLeapYearsSince1970(
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FLMUINT16 ui16Year)
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{
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FLMUINT uiTemp;
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/* first calculate # of leap years since 1600 */
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ui16Year -= 1601; /* ui16Year = number of years since 1600*/
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uiTemp = ( /* Count leap years */
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(ui16Year / 4) - /* Count potential leap years */
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(ui16Year / 100) + /* Subtract out century years */
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(ui16Year / 400) + /* Add back in quadricentenial years*/
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1 /* And don't forget to count 1600 */
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);
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/* now subtract # of leap years between 1600 and 1970 */
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/* (the following becomes a constant at compile time) */
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uiTemp -= ((BASEYR-1600) / 4) - ((BASEYR-1600) / 100) + 1;
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return(uiTemp);
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}
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/****************************************************************************
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Desc: Convert from seconds to the F_TMSTAMP structure.
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Notes:
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****************************************************************************/
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void f_timeSecondsToDate(
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FLMUINT uiSeconds,
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F_TMSTAMP * date)
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{
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FLMUINT uiLeapYear;
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FLMUINT uiMonth;
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FLMUINT uiDaysInMonth;
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FLMUINT uiDay;
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uiDay = uiSeconds / SECONDSPERDAY; // # of days since 1970
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date->year = (FLMUINT16)((uiDay / DDAYSPERYEAR) + BASEYR);
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uiDay = uiDay % DDAYSPERYEAR; // # of days into year
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/*
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Check to see that the value for the current day is greater than the
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number of leap years since 1970. This is because we will be
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subtracting the leap days from the current day and we don't want
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the value for the day to go negative.
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*/
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while( uiDay < f_timeLeapYearsSince1970(date->year)) // if day < # of leap years
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{
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date->year--; // decrement the year
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uiDay += DDAYSPERYEAR; // adjust day by days/year
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}
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uiDay -= f_timeLeapYearsSince1970( date->year); // subtract leap days
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uiLeapYear = f_timeIsLeapYear( date->year ); // set leap year flag
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/*
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Find what our offset into the current month is.
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To do this, we subtract out the number of days for each month, until
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the number of days left does not span the end of the current month
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*/
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for( uiMonth = 0;
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uiMonth < 12 &&
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(uiDay >= (uiDaysInMonth = ui8NumDaysPerMonth[uiLeapYear][uiMonth]));
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uiMonth++)
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{
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uiDay -= uiDaysInMonth; // subtract days in month
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}
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date->month = (FLMUINT8) uiMonth; // set month, day
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date->day = (FLMUINT8) (++uiDay);
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uiDay = uiSeconds % SECONDSPERDAY; // mod by seconds/day
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date->hour = (FLMUINT8)(uiDay / SECONDSPERHOUR);// get # of hours
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uiDay = uiDay % SECONDSPERHOUR;
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date->minute = (FLMUINT8)(uiDay / 60); // get # of minutes
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date->second = (FLMUINT8)(uiDay % 60);
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date->hundredth = 0; // no fractional seconds
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}
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/****************************************************************************
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Desc: Convert a time stamp to the number of seconds.
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****************************************************************************/
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void f_timeDateToSeconds(
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F_TMSTAMP * pTimeStamp, // [in] - time stamp of date
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FLMUINT * puiSeconds) // [out] - seconds of time stamp
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{
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FLMUINT uiDays = 0;
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// is date past max?
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if( f_timeCompareTimeStamps( pTimeStamp, &maxdate, 0) > 0)
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{
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*pTimeStamp = maxdate;
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}
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// Do date portion of calculation - result is days since 1/1/1970.
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if( pTimeStamp->year)
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{
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uiDays =
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(pTimeStamp->year - BASEYR) * 365 + // years since BASE * days
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f_timeLeapYearsSince1970( pTimeStamp->year) +// leap years since BASE
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ui16NumDaysFromJan1st[ f_timeIsLeapYear(pTimeStamp->year)][pTimeStamp->month] +
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pTimeStamp->day - 1; // days since 1st of month
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}
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// Do time part of calculation - secs since 1/1/1970 12:00am.
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*puiSeconds = (((uiDays * 24) + // convert days to hours
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pTimeStamp->hour ) * 60 + // convert hours to min
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pTimeStamp->minute) * 60 + // convert min to sec
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pTimeStamp->second; // give secs granularity
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}
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/****************************************************************************
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Desc: Compare two time stamps
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In: date1, date2 - pointers to two DATIM structures
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flag - flag to indicate the type of comparison
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0 - compare date and time
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1 - compare date only
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2 - compare time only
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Out:
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Ret: -1 if date1 is less than date2
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0 if date1 is equal to date2
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1 if date1 is greater than date2
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Notes:
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****************************************************************************/
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FLMINT f_timeCompareTimeStamps(
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F_TMSTAMP * pTimeStamp1,
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F_TMSTAMP * pTimeStamp2,
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FLMUINT flag)
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{
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if( flag != 2) /* not comparing times only */
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{
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if( pTimeStamp1->year != pTimeStamp2->year)
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{
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return((pTimeStamp1->year < pTimeStamp2->year) ? -1 : 1);
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}
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if( pTimeStamp1->month != pTimeStamp2->month)
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{
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return((pTimeStamp1->month < pTimeStamp2->month) ? -1 : 1);
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}
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if( pTimeStamp1->day != pTimeStamp2->day)
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{
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return((pTimeStamp1->day < pTimeStamp2->day) ? -1 : 1);
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}
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}
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if( flag != 1)
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{
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if( pTimeStamp1->hour != pTimeStamp2->hour)
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{
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return((pTimeStamp1->hour < pTimeStamp2->hour) ? -1 : 1);
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}
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if( pTimeStamp1->minute != pTimeStamp2->minute)
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{
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return((pTimeStamp1->minute < pTimeStamp2->minute) ? -1 : 1);
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}
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if( pTimeStamp1->second != pTimeStamp2->second)
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{
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return((pTimeStamp1->second < pTimeStamp2->second) ? -1 : 1);
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}
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}
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return(0);
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}
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/****************************************************************************
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Desc: Get the current time in milliseconds.
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****************************************************************************/
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#if defined( FLM_UNIX)
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unsigned f_timeGetMilliTime()
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{
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#if defined( FLM_SOLARIS)
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return( (unsigned)((FLMUINT64)gethrtime() / (FLMUINT64)1000000));
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#else
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struct timeval tv;
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gettimeofday(&tv, 0);
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return( (((FLMUINT64)tv.tv_sec * (FLMUINT64)1000000) +
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(FLMUINT64)tv.tv_usec) / 1000);
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#endif
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}
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#endif
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