mirror of
https://github.com/reactos/reactos.git
synced 2024-10-31 20:02:55 +00:00
382 lines
11 KiB
C
382 lines
11 KiB
C
/*
|
|
* COPYRIGHT: See COPYING in the top level directory
|
|
* PROJECT: ReactOS system libraries
|
|
* FILE: lib/kernel32/misc/time.c
|
|
* PURPOSE: Time conversion functions
|
|
* PROGRAMMER: Ariadne
|
|
* DOSDATE and DOSTIME structures from Onno Hovers
|
|
* UPDATE HISTORY:
|
|
* Created 19/01/99
|
|
*/
|
|
|
|
/* INCLUDES ******************************************************************/
|
|
|
|
#include <k32.h>
|
|
|
|
#define NDEBUG
|
|
#include <debug.h>
|
|
|
|
/* TYPES *********************************************************************/
|
|
|
|
#define TICKSPERMIN 600000000
|
|
|
|
#define LL2FILETIME( ll, pft )\
|
|
(pft)->dwLowDateTime = (UINT)(ll); \
|
|
(pft)->dwHighDateTime = (UINT)((ll) >> 32);
|
|
#define FILETIME2LL( pft, ll) \
|
|
ll = (((LONGLONG)((pft)->dwHighDateTime))<<32) + (pft)-> dwLowDateTime ;
|
|
|
|
static const int MonthLengths[2][12] =
|
|
{
|
|
{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
|
|
{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
|
|
};
|
|
|
|
/* STATIC FUNTIONS **********************************************************/
|
|
|
|
static inline int IsLeapYear(int Year)
|
|
{
|
|
return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ? 1 : 0;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* TIME_DayLightCompareDate
|
|
*
|
|
* Compares two dates without looking at the year.
|
|
*
|
|
* PARAMS
|
|
* date [in] The local time to compare.
|
|
* compareDate [in] The daylight savings begin or end date.
|
|
*
|
|
* RETURNS
|
|
*
|
|
* -1 if date < compareDate
|
|
* 0 if date == compareDate
|
|
* 1 if date > compareDate
|
|
* -2 if an error occurs
|
|
*/
|
|
static int
|
|
TIME_DayLightCompareDate(const SYSTEMTIME *date, const SYSTEMTIME *compareDate)
|
|
{
|
|
int limit_day, dayinsecs;
|
|
|
|
if (date->wMonth < compareDate->wMonth)
|
|
return -1; /* We are in a month before the date limit. */
|
|
|
|
if (date->wMonth > compareDate->wMonth)
|
|
return 1; /* We are in a month after the date limit. */
|
|
|
|
/* if year is 0 then date is in day-of-week format, otherwise
|
|
* it's absolute date.
|
|
*/
|
|
if (compareDate->wYear == 0)
|
|
{
|
|
WORD First;
|
|
/* compareDate->wDay is interpreted as number of the week in the month
|
|
* 5 means: the last week in the month */
|
|
int weekofmonth = compareDate->wDay;
|
|
/* calculate the day of the first DayOfWeek in the month */
|
|
First = ( 6 + compareDate->wDayOfWeek - date->wDayOfWeek + date->wDay
|
|
) % 7 + 1;
|
|
limit_day = First + 7 * (weekofmonth - 1);
|
|
/* check needed for the 5th weekday of the month */
|
|
if(limit_day > MonthLengths[date->wMonth==2 && IsLeapYear(date->wYear)]
|
|
[date->wMonth - 1])
|
|
limit_day -= 7;
|
|
}
|
|
else
|
|
{
|
|
limit_day = compareDate->wDay;
|
|
}
|
|
|
|
/* convert to seconds */
|
|
limit_day = ((limit_day * 24 + compareDate->wHour) * 60 +
|
|
compareDate->wMinute ) * 60;
|
|
dayinsecs = ((date->wDay * 24 + date->wHour) * 60 +
|
|
date->wMinute ) * 60 + date->wSecond;
|
|
/* and compare */
|
|
return dayinsecs < limit_day ? -1 :
|
|
dayinsecs > limit_day ? 1 :
|
|
0; /* date is equal to the date limit. */
|
|
}
|
|
|
|
/***********************************************************************
|
|
* TIME_CompTimeZoneID
|
|
*
|
|
* Computes the local time bias for a given time and time zone.
|
|
*
|
|
* PARAMS
|
|
* pTZinfo [in] The time zone data.
|
|
* lpFileTime [in] The system or local time.
|
|
* islocal [in] it is local time.
|
|
*
|
|
* RETURNS
|
|
* TIME_ZONE_ID_INVALID An error occurred
|
|
* TIME_ZONE_ID_UNKNOWN There are no transition time known
|
|
* TIME_ZONE_ID_STANDARD Current time is standard time
|
|
* TIME_ZONE_ID_DAYLIGHT Current time is daylight savings time
|
|
*/
|
|
static
|
|
DWORD
|
|
TIME_CompTimeZoneID( const TIME_ZONE_INFORMATION *pTZinfo, FILETIME *lpFileTime, BOOL islocal )
|
|
{
|
|
int ret;
|
|
BOOL beforeStandardDate, afterDaylightDate;
|
|
DWORD retval = TIME_ZONE_ID_INVALID;
|
|
LONGLONG llTime = 0; /* initialized to prevent gcc complaining */
|
|
SYSTEMTIME SysTime;
|
|
FILETIME ftTemp;
|
|
|
|
if (pTZinfo->DaylightDate.wMonth != 0)
|
|
{
|
|
/* if year is 0 then date is in day-of-week format, otherwise
|
|
* it's absolute date.
|
|
*/
|
|
if (pTZinfo->StandardDate.wMonth == 0 ||
|
|
(pTZinfo->StandardDate.wYear == 0 &&
|
|
(pTZinfo->StandardDate.wDay<1 ||
|
|
pTZinfo->StandardDate.wDay>5 ||
|
|
pTZinfo->DaylightDate.wDay<1 ||
|
|
pTZinfo->DaylightDate.wDay>5)))
|
|
{
|
|
SetLastError(ERROR_INVALID_PARAMETER);
|
|
return TIME_ZONE_ID_INVALID;
|
|
}
|
|
|
|
if (!islocal) {
|
|
FILETIME2LL( lpFileTime, llTime );
|
|
llTime -= ( pTZinfo->Bias + pTZinfo->DaylightBias )
|
|
* (LONGLONG)TICKSPERMIN;
|
|
LL2FILETIME( llTime, &ftTemp)
|
|
lpFileTime = &ftTemp;
|
|
}
|
|
|
|
FileTimeToSystemTime(lpFileTime, &SysTime);
|
|
|
|
/* check for daylight savings */
|
|
ret = TIME_DayLightCompareDate( &SysTime, &pTZinfo->StandardDate);
|
|
if (ret == -2)
|
|
return TIME_ZONE_ID_INVALID;
|
|
|
|
beforeStandardDate = ret < 0;
|
|
|
|
if (!islocal) {
|
|
llTime -= ( pTZinfo->StandardBias - pTZinfo->DaylightBias )
|
|
* (LONGLONG)TICKSPERMIN;
|
|
LL2FILETIME( llTime, &ftTemp)
|
|
FileTimeToSystemTime(lpFileTime, &SysTime);
|
|
}
|
|
|
|
ret = TIME_DayLightCompareDate( &SysTime, &pTZinfo->DaylightDate);
|
|
if (ret == -2)
|
|
return TIME_ZONE_ID_INVALID;
|
|
|
|
afterDaylightDate = ret >= 0;
|
|
|
|
retval = TIME_ZONE_ID_STANDARD;
|
|
if( pTZinfo->DaylightDate.wMonth < pTZinfo->StandardDate.wMonth ) {
|
|
/* Northern hemisphere */
|
|
if( beforeStandardDate && afterDaylightDate )
|
|
retval = TIME_ZONE_ID_DAYLIGHT;
|
|
} else /* Down south */
|
|
if( beforeStandardDate || afterDaylightDate )
|
|
retval = TIME_ZONE_ID_DAYLIGHT;
|
|
} else
|
|
/* No transition date */
|
|
retval = TIME_ZONE_ID_UNKNOWN;
|
|
|
|
return retval;
|
|
}
|
|
|
|
/***********************************************************************
|
|
* TIME_TimeZoneID
|
|
*
|
|
* Calculates whether daylight savings is on now.
|
|
*
|
|
* PARAMS
|
|
* pTzi [in] Timezone info.
|
|
*
|
|
* RETURNS
|
|
* TIME_ZONE_ID_INVALID An error occurred
|
|
* TIME_ZONE_ID_UNKNOWN There are no transition time known
|
|
* TIME_ZONE_ID_STANDARD Current time is standard time
|
|
* TIME_ZONE_ID_DAYLIGHT Current time is daylight savings time
|
|
*/
|
|
static DWORD TIME_ZoneID( const TIME_ZONE_INFORMATION *pTzi )
|
|
{
|
|
FILETIME ftTime;
|
|
GetSystemTimeAsFileTime( &ftTime);
|
|
return TIME_CompTimeZoneID( pTzi, &ftTime, FALSE);
|
|
}
|
|
|
|
/***********************************************************************
|
|
* TIME_GetTimezoneBias
|
|
*
|
|
* Calculates the local time bias for a given time zone.
|
|
*
|
|
* PARAMS
|
|
* pTZinfo [in] The time zone data.
|
|
* lpFileTime [in] The system or local time.
|
|
* islocal [in] It is local time.
|
|
* pBias [out] The calculated bias in minutes.
|
|
*
|
|
* RETURNS
|
|
* TRUE when the time zone bias was calculated.
|
|
*/
|
|
static BOOL
|
|
TIME_GetTimezoneBias(const TIME_ZONE_INFORMATION *pTZinfo, FILETIME *lpFileTime, BOOL islocal, LONG *pBias)
|
|
{
|
|
LONG bias = pTZinfo->Bias;
|
|
DWORD tzid = TIME_CompTimeZoneID(pTZinfo, lpFileTime, islocal);
|
|
|
|
if( tzid == TIME_ZONE_ID_INVALID)
|
|
return FALSE;
|
|
if (tzid == TIME_ZONE_ID_DAYLIGHT)
|
|
bias += pTZinfo->DaylightBias;
|
|
else if (tzid == TIME_ZONE_ID_STANDARD)
|
|
bias += pTZinfo->StandardBias;
|
|
*pBias = bias;
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/* FUNCTIONS ****************************************************************/
|
|
|
|
/*
|
|
* @implemented
|
|
*/
|
|
DWORD
|
|
WINAPI
|
|
GetTimeZoneInformation(LPTIME_ZONE_INFORMATION lpTimeZoneInformation)
|
|
{
|
|
NTSTATUS Status;
|
|
|
|
DPRINT("GetTimeZoneInformation()\n");
|
|
|
|
Status = NtQuerySystemInformation(SystemCurrentTimeZoneInformation,
|
|
lpTimeZoneInformation,
|
|
sizeof(TIME_ZONE_INFORMATION),
|
|
NULL);
|
|
if (!NT_SUCCESS(Status))
|
|
{
|
|
BaseSetLastNTError(Status);
|
|
return TIME_ZONE_ID_INVALID;
|
|
}
|
|
|
|
return TIME_ZoneID(lpTimeZoneInformation);
|
|
}
|
|
|
|
|
|
/*
|
|
* @implemented
|
|
*/
|
|
BOOL
|
|
WINAPI
|
|
SetTimeZoneInformation(CONST TIME_ZONE_INFORMATION *lpTimeZoneInformation)
|
|
{
|
|
NTSTATUS Status;
|
|
|
|
DPRINT("SetTimeZoneInformation()\n");
|
|
|
|
Status = RtlSetTimeZoneInformation((LPTIME_ZONE_INFORMATION)lpTimeZoneInformation);
|
|
if (!NT_SUCCESS(Status))
|
|
{
|
|
DPRINT1("RtlSetTimeZoneInformation() failed (Status %lx)\n", Status);
|
|
BaseSetLastNTError(Status);
|
|
return FALSE;
|
|
}
|
|
|
|
Status = NtSetSystemInformation(SystemCurrentTimeZoneInformation,
|
|
(PVOID)lpTimeZoneInformation,
|
|
sizeof(TIME_ZONE_INFORMATION));
|
|
if (!NT_SUCCESS(Status))
|
|
{
|
|
DPRINT1("NtSetSystemInformation() failed (Status %lx)\n", Status);
|
|
BaseSetLastNTError(Status);
|
|
return FALSE;
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/*
|
|
* @implemented
|
|
*/
|
|
BOOL
|
|
WINAPI
|
|
SystemTimeToTzSpecificLocalTime(CONST TIME_ZONE_INFORMATION *lpTimeZoneInformation,
|
|
CONST SYSTEMTIME *lpUniversalTime,
|
|
LPSYSTEMTIME lpLocalTime)
|
|
{
|
|
TIME_ZONE_INFORMATION TzInfo;
|
|
FILETIME FileTime;
|
|
LONGLONG llTime;
|
|
LONG lBias;
|
|
|
|
if (lpTimeZoneInformation != NULL)
|
|
{
|
|
TzInfo = *lpTimeZoneInformation;
|
|
}
|
|
else
|
|
{
|
|
if (GetTimeZoneInformation(&TzInfo) == TIME_ZONE_ID_INVALID)
|
|
return FALSE;
|
|
}
|
|
|
|
if (!lpUniversalTime || !lpLocalTime)
|
|
return FALSE;
|
|
|
|
if (!SystemTimeToFileTime(lpUniversalTime, &FileTime))
|
|
return FALSE;
|
|
|
|
FILETIME2LL(&FileTime, llTime)
|
|
|
|
if (!TIME_GetTimezoneBias(&TzInfo, &FileTime, FALSE, &lBias))
|
|
return FALSE;
|
|
|
|
/* convert minutes to 100-nanoseconds-ticks */
|
|
llTime -= (LONGLONG)lBias * TICKSPERMIN;
|
|
|
|
LL2FILETIME( llTime, &FileTime)
|
|
|
|
return FileTimeToSystemTime(&FileTime, lpLocalTime);
|
|
}
|
|
|
|
|
|
/*
|
|
* @implemented (Wine 13 sep 2008)
|
|
*/
|
|
BOOL
|
|
WINAPI
|
|
TzSpecificLocalTimeToSystemTime(LPTIME_ZONE_INFORMATION lpTimeZoneInformation,
|
|
LPSYSTEMTIME lpLocalTime,
|
|
LPSYSTEMTIME lpUniversalTime)
|
|
{
|
|
FILETIME ft;
|
|
LONG lBias;
|
|
LONGLONG t;
|
|
TIME_ZONE_INFORMATION tzinfo;
|
|
|
|
if (lpTimeZoneInformation != NULL)
|
|
{
|
|
tzinfo = *lpTimeZoneInformation;
|
|
}
|
|
else
|
|
{
|
|
if (GetTimeZoneInformation(&tzinfo) == TIME_ZONE_ID_INVALID)
|
|
return FALSE;
|
|
}
|
|
|
|
if (!SystemTimeToFileTime(lpLocalTime, &ft))
|
|
return FALSE;
|
|
FILETIME2LL( &ft, t)
|
|
if (!TIME_GetTimezoneBias(&tzinfo, &ft, TRUE, &lBias))
|
|
return FALSE;
|
|
/* convert minutes to 100-nanoseconds-ticks */
|
|
t += (LONGLONG)lBias * TICKSPERMIN;
|
|
LL2FILETIME( t, &ft)
|
|
return FileTimeToSystemTime(&ft, lpUniversalTime);
|
|
}
|
|
|
|
/* EOF */
|