Source code of Windows XP (NT5)
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//#pragma title( "Common.cpp - Common class implementations" )
/*
Copyright (c) 1995-1998, Mission Critical Software, Inc. All rights reserved.
===============================================================================
Module - Common.cpp
System - Common
Author - Tom Bernhardt, Rich Denham
Created - 1994-08-22
Description - Common class implementations.
Updates - 1997-09-09 RED ErrorCodeToText moved to Err.cpp
- 1997-09-12 RED replace TTime class
===============================================================================
*/
#ifdef USE_STDAFX
# include "stdafx.h"
# include "rpc.h"
#else
# include <windows.h>
#endif
#include "Common.hpp"
///////////////////////////////////////////////////////////////////////////////
// TTime class member functions
///////////////////////////////////////////////////////////////////////////////
TTime gTTime; // global instance of TTime
time_t // ret-current time
TTime::Now(
time_t * pTime // out-optional current time
) const
{
time_t tTime; // work copy of current time
union
{
__int64 intTime;
FILETIME fileTime;
} wTime;
GetSystemTimeAsFileTime( &wTime.fileTime );
tTime = ConvertFiletimeToTimet( wTime.intTime );
if ( pTime ) *pTime = tTime;
return tTime;
}
__int64 // ret-current time
TTime::NowAsFiletime(
__int64 * pTime // out-optional current time
) const
{
union
{
__int64 intTime;
FILETIME fileTime;
} wTime;
GetSystemTimeAsFileTime( &wTime.fileTime );
if ( pTime ) *pTime = wTime.intTime;
return wTime.intTime;
}
time_t // ret-time_t representation
TTime::ConvertFiletimeToTimet(
__int64 fileTime // in -filetime representation
) const
{
__int64 wTime; // intermediate work area
time_t retTime; // returned time
// If the source date/time is less than the minimum date/time supported
// by time_t, then zero is returned.
// If the source date/time is more that the maximum date/time supported
// by time_t, then ULONG_MAX is returned.
wTime = fileTime / 10000000;
if ( wTime < 11644473600 )
{
retTime = 0;
}
else
{
wTime -= 11644473600;
if ( wTime > ULONG_MAX )
{
retTime = ULONG_MAX;
}
else
{
retTime = (time_t) wTime;
}
}
return retTime;
}
WCHAR * // ret-YYYY-MM-DD HH:MM:SS string
TTime::FormatIsoUtc(
time_t tTime ,// in -time_t representation
WCHAR * sTime // out-YYYY-MM-DD HH:MM:SS string
) const
{
struct tm * tmTime;
tmTime = gmtime( &tTime );
tmTime->tm_year += tmTime->tm_year >= 70 ? 1900 : 2000;
swprintf(
sTime,
L"%04d-%02d-%02d %02d:%02d:%02d",
tmTime->tm_year,
tmTime->tm_mon+1,
tmTime->tm_mday,
tmTime->tm_hour,
tmTime->tm_min,
tmTime->tm_sec );
return sTime;
}
WCHAR * // ret-YYYY-MM-DD HH:MM:SS string
TTime::FormatIsoLcl(
time_t tTime ,// in -time_t representation
WCHAR * sTime // out-YYYY-MM-DD HH:MM:SS string
) const
{
struct tm * tmTime;
TIME_ZONE_INFORMATION infoTime; // WIN32 time zone info
time_t wTime; // workarea
switch ( GetTimeZoneInformation( &infoTime ) )
{
case TIME_ZONE_ID_STANDARD:
wTime = infoTime.StandardBias;
break;
case TIME_ZONE_ID_DAYLIGHT:
wTime = infoTime.DaylightBias;
break;
default:
wTime = 0;
break;
}
wTime = (infoTime.Bias + wTime) * 60;
wTime = tTime - wTime;
if ( wTime < 0 )
{
wTime = 0;
}
tmTime = gmtime( &wTime );
tmTime->tm_year += tmTime->tm_year >= 70 ? 1900 : 2000;
swprintf(
sTime,
L"%04d-%02d-%02d %02d:%02d:%02d",
tmTime->tm_year,
tmTime->tm_mon+1,
tmTime->tm_mday,
tmTime->tm_hour,
tmTime->tm_min,
tmTime->tm_sec );
return sTime;
}
// Return time zone information
// If the returned value is TRUE, the EaTimeZoneInfo structure is filled in
// If the returned value is FALSE, the EaTimeZoneInfo structure is all zeroes
// Note: UTC (gTTime.Now( NULL )) plus pTimeZoneInfo->biasdst is the local date/time
BOOL
EaGetTimeZoneInfo(
EaTimeZoneInfo * pTimeZoneInfo // in -time zone information
)
{
memset( pTimeZoneInfo, 0, sizeof *pTimeZoneInfo );
BOOL retval=TRUE; // returned value
DWORD OsRc; // OS return code
TIME_ZONE_INFORMATION TimeZoneInfo; // WIN32 time zone info
OsRc = GetTimeZoneInformation( &TimeZoneInfo );
switch ( OsRc )
{
case TIME_ZONE_ID_STANDARD:
pTimeZoneInfo->dst = TimeZoneInfo.StandardBias;
break;
case TIME_ZONE_ID_DAYLIGHT:
pTimeZoneInfo->dst = TimeZoneInfo.DaylightBias;
break;
case TIME_ZONE_ID_UNKNOWN:
retval = TimeZoneInfo.Bias;
break;
default:
retval = FALSE;
break;
}
if ( retval )
{
pTimeZoneInfo->bias = TimeZoneInfo.Bias * 60;
pTimeZoneInfo->dst *= 60;
pTimeZoneInfo->biasdst = pTimeZoneInfo->bias + pTimeZoneInfo->dst;
}
return retval;
}
// Common.cpp - end of file