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Call TIME_GetBias rather than RtlQueryTimeZoneInfo if we're only 

interested in the bias - it's faster.
This commit is contained in:
Huw Davies 2004-02-26 05:26:34 +00:00 committed by Alexandre Julliard
parent b65d13605c
commit 64ed848712
1 changed files with 33 additions and 29 deletions
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62
dlls/ntdll/time.c
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@ -257,8 +257,6 @@ static const struct tagTZ_INFO TZ_INFO[] =
'e','\0'}, -780, 0} 'e','\0'}, -780, 0}
}; };
/*********** start of code by Rex Jolliff (rex@lvcablemodem.com) **************/
#define TICKSPERSEC 10000000 #define TICKSPERSEC 10000000
#define TICKSPERMSEC 10000 #define TICKSPERMSEC 10000
#define SECSPERDAY 86400 #define SECSPERDAY 86400
@ -469,6 +467,27 @@ BOOLEAN WINAPI RtlTimeFieldsToTime(
return TRUE; return TRUE;
} }
/***********************************************************************
* TIME_GetBias [internal]
*
* Helper function calculates delta local time from UTC.
*
* PARAMS
* utc [I] The current utc time.
* pdaylight [I] Local daylight.
*
* RETURNS
* The bias for the current timezone.
*/
static int TIME_GetBias(time_t utc, int *pdaylight)
{
struct tm *ptm = localtime(&utc);
*pdaylight = ptm->tm_isdst; /* daylight for local timezone */
ptm = gmtime(&utc);
ptm->tm_isdst = *pdaylight; /* use local daylight, not that of Greenwich */
return (int)(utc-mktime(ptm));
}
/****************************************************************************** /******************************************************************************
* RtlLocalTimeToSystemTime [NTDLL.@] * RtlLocalTimeToSystemTime [NTDLL.@]
* *
@ -485,12 +504,15 @@ BOOLEAN WINAPI RtlTimeFieldsToTime(
NTSTATUS WINAPI RtlLocalTimeToSystemTime( const LARGE_INTEGER *LocalTime, NTSTATUS WINAPI RtlLocalTimeToSystemTime( const LARGE_INTEGER *LocalTime,
PLARGE_INTEGER SystemTime) PLARGE_INTEGER SystemTime)
{ {
TIME_ZONE_INFORMATION tzinfo; time_t gmt;
int bias, daylight;
TRACE("(%p, %p)\n", LocalTime, SystemTime); TRACE("(%p, %p)\n", LocalTime, SystemTime);
RtlQueryTimeZoneInformation(&tzinfo); gmt = time(NULL);
SystemTime->QuadPart = LocalTime->QuadPart + tzinfo.Bias * 60 * (LONGLONG)10000000; bias = TIME_GetBias(gmt, &daylight);
SystemTime->QuadPart = LocalTime->QuadPart - bias * (LONGLONG)10000000;
return STATUS_SUCCESS; return STATUS_SUCCESS;
} }
@ -510,12 +532,15 @@ NTSTATUS WINAPI RtlLocalTimeToSystemTime( const LARGE_INTEGER *LocalTime,
NTSTATUS WINAPI RtlSystemTimeToLocalTime( const LARGE_INTEGER *SystemTime, NTSTATUS WINAPI RtlSystemTimeToLocalTime( const LARGE_INTEGER *SystemTime,
PLARGE_INTEGER LocalTime ) PLARGE_INTEGER LocalTime )
{ {
TIME_ZONE_INFORMATION tzinfo; time_t gmt;
int bias, daylight;
TRACE("(%p, %p)\n", SystemTime, LocalTime); TRACE("(%p, %p)\n", SystemTime, LocalTime);
RtlQueryTimeZoneInformation(&tzinfo); gmt = time(NULL);
LocalTime->QuadPart = SystemTime->QuadPart - tzinfo.Bias * 60 * (LONGLONG)10000000; bias = TIME_GetBias(gmt, &daylight);
LocalTime->QuadPart = SystemTime->QuadPart + bias * (LONGLONG)10000000;
return STATUS_SUCCESS; return STATUS_SUCCESS;
} }
@ -658,27 +683,6 @@ NTSTATUS WINAPI NtQuerySystemTime( PLARGE_INTEGER Time )
return STATUS_SUCCESS; return STATUS_SUCCESS;
} }
/***********************************************************************
* TIME_GetBias [internal]
*
* Helper function calculates delta local time from UTC.
*
* PARAMS
* utc [I] The current utc time.
* pdaylight [I] Local daylight.
*
* RETURNS
* The bias for the current timezone.
*/
static int TIME_GetBias(time_t utc, int *pdaylight)
{
struct tm *ptm = localtime(&utc);
*pdaylight = ptm->tm_isdst; /* daylight for local timezone */
ptm = gmtime(&utc);
ptm->tm_isdst = *pdaylight; /* use local daylight, not that of Greenwich */
return (int)(utc-mktime(ptm));
}
/*********************************************************************** /***********************************************************************
* TIME_GetTZAsStr [internal] * TIME_GetTZAsStr [internal]
* *