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reactos/sdk/lib/rtl/time.c

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS system libraries
* FILE: lib/rtl/time.c
* PURPOSE: Conversion between Time and TimeFields
* PROGRAMMER: Rex Jolliff (rex@lvcablemodem.com)
*/
/* INCLUDES *****************************************************************/
#include <rtl.h>
#define NDEBUG
#include <debug.h>
#define TICKSPERMIN 600000000
#define TICKSPERSEC 10000000
#define TICKSPERMSEC 10000
#define SECSPERDAY 86400
#define SECSPERHOUR 3600
#define SECSPERMIN 60
#define MINSPERHOUR 60
#define HOURSPERDAY 24
#define EPOCHWEEKDAY 1
#define DAYSPERWEEK 7
#define EPOCHYEAR 1601
#define DAYSPERNORMALYEAR 365
#define DAYSPERLEAPYEAR 366
#define MONSPERYEAR 12
#if defined(__GNUC__)
#define TICKSTO1970 0x019db1ded53e8000LL
#define TICKSTO1980 0x01a8e79fe1d58000LL
#else
#define TICKSTO1970 0x019db1ded53e8000i64
#define TICKSTO1980 0x01a8e79fe1d58000i64
#endif
static const unsigned int YearLengths[2] =
{
DAYSPERNORMALYEAR, DAYSPERLEAPYEAR
};
static const UCHAR MonthLengths[2][MONSPERYEAR] =
{
{ 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 __inline int IsLeapYear(int Year)
{
return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ? 1 : 0;
}
static int DaysSinceEpoch(int Year)
{
int Days;
Year--; /* Don't include a leap day from the current year */
Days = Year * DAYSPERNORMALYEAR + Year / 4 - Year / 100 + Year / 400;
Days -= (EPOCHYEAR - 1) * DAYSPERNORMALYEAR + (EPOCHYEAR - 1) / 4 - (EPOCHYEAR - 1) / 100 + (EPOCHYEAR - 1) / 400;
return Days;
}
/* FUNCTIONS *****************************************************************/
/*
* @implemented
*/
BOOLEAN NTAPI
RtlCutoverTimeToSystemTime(IN PTIME_FIELDS CutoverTimeFields,
OUT PLARGE_INTEGER SystemTime,
IN PLARGE_INTEGER CurrentTime,
IN BOOLEAN ThisYearsCutoverOnly)
{
TIME_FIELDS AdjustedTimeFields;
TIME_FIELDS CurrentTimeFields;
TIME_FIELDS CutoverSystemTimeFields;
LARGE_INTEGER CutoverSystemTime;
UCHAR MonthLength;
CSHORT Days;
BOOLEAN NextYearsCutover = FALSE;
/* Check fixed cutover time */
if (CutoverTimeFields->Year != 0)
{
if (!RtlTimeFieldsToTime(CutoverTimeFields, SystemTime))
return FALSE;
if (SystemTime->QuadPart < CurrentTime->QuadPart)
return FALSE;
return TRUE;
}
/*
* Compute recurring cutover time
*/
/* Day must be between 1(first) and 5(last) */
if (CutoverTimeFields->Day == 0 || CutoverTimeFields->Day > 5)
return FALSE;
RtlTimeToTimeFields(CurrentTime, &CurrentTimeFields);
while (TRUE)
{
/* Compute the cutover time of the first day of the current month */
AdjustedTimeFields.Year = CurrentTimeFields.Year;
if (NextYearsCutover)
AdjustedTimeFields.Year++;
AdjustedTimeFields.Month = CutoverTimeFields->Month;
AdjustedTimeFields.Day = 1;
AdjustedTimeFields.Hour = CutoverTimeFields->Hour;
AdjustedTimeFields.Minute = CutoverTimeFields->Minute;
AdjustedTimeFields.Second = CutoverTimeFields->Second;
AdjustedTimeFields.Milliseconds = CutoverTimeFields->Milliseconds;
if (!RtlTimeFieldsToTime(&AdjustedTimeFields, &CutoverSystemTime))
return FALSE;
RtlTimeToTimeFields(&CutoverSystemTime, &CutoverSystemTimeFields);
/* Adjust day to first matching weekday */
if (CutoverSystemTimeFields.Weekday != CutoverTimeFields->Weekday)
{
if (CutoverSystemTimeFields.Weekday < CutoverTimeFields->Weekday)
Days = CutoverTimeFields->Weekday - CutoverSystemTimeFields.Weekday;
else
Days = DAYSPERWEEK - (CutoverSystemTimeFields.Weekday - CutoverTimeFields->Weekday);
AdjustedTimeFields.Day += Days;
}
/* Adjust the number of weeks */
if (CutoverTimeFields->Day > 1)
{
Days = DAYSPERWEEK * (CutoverTimeFields->Day - 1);
MonthLength = MonthLengths[IsLeapYear(AdjustedTimeFields.Year)][AdjustedTimeFields.Month - 1];
if ((AdjustedTimeFields.Day + Days) > MonthLength)
Days -= DAYSPERWEEK;
AdjustedTimeFields.Day += Days;
}
if (!RtlTimeFieldsToTime(&AdjustedTimeFields, &CutoverSystemTime))
return FALSE;
if (ThisYearsCutoverOnly ||
NextYearsCutover ||
CutoverSystemTime.QuadPart >= CurrentTime->QuadPart)
{
break;
}
NextYearsCutover = TRUE;
}
SystemTime->QuadPart = CutoverSystemTime.QuadPart;
return TRUE;
}
/*
* @implemented
*/
BOOLEAN
NTAPI
RtlTimeFieldsToTime(IN PTIME_FIELDS TimeFields,
OUT PLARGE_INTEGER Time)
{
ULONG CurMonth;
TIME_FIELDS IntTimeFields;
RtlCopyMemory(&IntTimeFields,
TimeFields,
sizeof(TIME_FIELDS));
if (TimeFields->Milliseconds < 0 || TimeFields->Milliseconds > 999 ||
TimeFields->Second < 0 || TimeFields->Second > 59 ||
TimeFields->Minute < 0 || TimeFields->Minute > 59 ||
TimeFields->Hour < 0 || TimeFields->Hour > 23 ||
TimeFields->Month < 1 || TimeFields->Month > 12 ||
TimeFields->Day < 1 ||
TimeFields->Day >
MonthLengths[IsLeapYear(TimeFields->Year)][TimeFields->Month - 1] ||
TimeFields->Year < 1601)
{
return FALSE;
}
/* Compute the time */
Time->QuadPart = DaysSinceEpoch(IntTimeFields.Year);
for (CurMonth = 1; CurMonth < IntTimeFields.Month; CurMonth++)
{
Time->QuadPart += MonthLengths[IsLeapYear(IntTimeFields.Year)][CurMonth - 1];
}
Time->QuadPart += IntTimeFields.Day - 1;
Time->QuadPart *= SECSPERDAY;
Time->QuadPart += IntTimeFields.Hour * SECSPERHOUR + IntTimeFields.Minute * SECSPERMIN +
IntTimeFields.Second;
Time->QuadPart *= TICKSPERSEC;
Time->QuadPart += IntTimeFields.Milliseconds * TICKSPERMSEC;
return TRUE;
}
/*
* @implemented
*/
VOID
NTAPI
RtlTimeToElapsedTimeFields(IN PLARGE_INTEGER Time,
OUT PTIME_FIELDS TimeFields)
{
ULONGLONG ElapsedSeconds;
ULONG SecondsInDay;
ULONG SecondsInMinute;
/* Extract millisecond from time */
TimeFields->Milliseconds = (CSHORT)((Time->QuadPart % TICKSPERSEC) / TICKSPERMSEC);
/* Compute elapsed seconds */
ElapsedSeconds = (ULONGLONG)Time->QuadPart / TICKSPERSEC;
/* Compute seconds within the day */
SecondsInDay = ElapsedSeconds % SECSPERDAY;
/* Compute elapsed minutes within the day */
SecondsInMinute = SecondsInDay % SECSPERHOUR;
/* Compute elapsed time of day */
TimeFields->Hour = (CSHORT)(SecondsInDay / SECSPERHOUR);
TimeFields->Minute = (CSHORT)(SecondsInMinute / SECSPERMIN);
TimeFields->Second = (CSHORT)(SecondsInMinute % SECSPERMIN);
/* Compute elapsed days */
TimeFields->Day = (CSHORT)(ElapsedSeconds / SECSPERDAY);
/* The elapsed number of months and days cannot be calculated */
TimeFields->Month = 0;
TimeFields->Year = 0;
}
/*
* @implemented
*/
VOID
NTAPI
RtlTimeToTimeFields(IN PLARGE_INTEGER Time,
OUT PTIME_FIELDS TimeFields)
{
const UCHAR *Months;
ULONG SecondsInDay, CurYear;
ULONG LeapYear, CurMonth;
ULONG Days;
ULONGLONG IntTime = Time->QuadPart;
/* Extract millisecond from time and convert time into seconds */
TimeFields->Milliseconds = (CSHORT)((IntTime % TICKSPERSEC) / TICKSPERMSEC);
IntTime = IntTime / TICKSPERSEC;
/* Split the time into days and seconds within the day */
Days = (ULONG)(IntTime / SECSPERDAY);
SecondsInDay = IntTime % SECSPERDAY;
/* Compute time of day */
TimeFields->Hour = (CSHORT)(SecondsInDay / SECSPERHOUR);
SecondsInDay = SecondsInDay % SECSPERHOUR;
TimeFields->Minute = (CSHORT)(SecondsInDay / SECSPERMIN);
TimeFields->Second = (CSHORT)(SecondsInDay % SECSPERMIN);
/* Compute day of week */
TimeFields->Weekday = (CSHORT)((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
/* Compute year */
CurYear = EPOCHYEAR;
CurYear += Days / DAYSPERLEAPYEAR;
Days -= DaysSinceEpoch(CurYear);
while (TRUE)
{
LeapYear = IsLeapYear(CurYear);
if (Days < YearLengths[LeapYear])
{
break;
}
CurYear++;
Days = Days - YearLengths[LeapYear];
}
TimeFields->Year = (CSHORT)CurYear;
/* Compute month of year */
LeapYear = IsLeapYear(CurYear);
Months = MonthLengths[LeapYear];
for (CurMonth = 0; Days >= Months[CurMonth]; CurMonth++)
{
Days = Days - Months[CurMonth];
}
TimeFields->Month = (CSHORT)(CurMonth + 1);
TimeFields->Day = (CSHORT)(Days + 1);
}
/*
* @implemented
*/
BOOLEAN
NTAPI
RtlTimeToSecondsSince1970(IN PLARGE_INTEGER Time,
OUT PULONG SecondsSince1970)
{
LARGE_INTEGER IntTime;
IntTime.QuadPart = Time->QuadPart - TICKSTO1970;
IntTime.QuadPart = IntTime.QuadPart / TICKSPERSEC;
if (IntTime.u.HighPart != 0)
return FALSE;
*SecondsSince1970 = IntTime.u.LowPart;
return TRUE;
}
/*
* @implemented
*/
BOOLEAN
NTAPI
RtlTimeToSecondsSince1980(IN PLARGE_INTEGER Time,
OUT PULONG SecondsSince1980)
{
LARGE_INTEGER IntTime;
IntTime.QuadPart = Time->QuadPart - TICKSTO1980;
IntTime.QuadPart = IntTime.QuadPart / TICKSPERSEC;
if (IntTime.u.HighPart != 0)
return FALSE;
*SecondsSince1980 = IntTime.u.LowPart;
return TRUE;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
RtlLocalTimeToSystemTime(IN PLARGE_INTEGER LocalTime,
OUT PLARGE_INTEGER SystemTime)
{
SYSTEM_TIMEOFDAY_INFORMATION TimeInformation;
NTSTATUS Status;
Status = ZwQuerySystemInformation(SystemTimeOfDayInformation,
&TimeInformation,
sizeof(TimeInformation),
NULL);
if (!NT_SUCCESS(Status))
return Status;
SystemTime->QuadPart = LocalTime->QuadPart +
TimeInformation.TimeZoneBias.QuadPart;
return STATUS_SUCCESS;
}
/*
* @implemented
*/
NTSTATUS
NTAPI
RtlSystemTimeToLocalTime(IN PLARGE_INTEGER SystemTime,
OUT PLARGE_INTEGER LocalTime)
{
SYSTEM_TIMEOFDAY_INFORMATION TimeInformation;
NTSTATUS Status;
Status = ZwQuerySystemInformation(SystemTimeOfDayInformation,
&TimeInformation,
sizeof(TimeInformation),
NULL);
if (!NT_SUCCESS(Status))
return Status;
LocalTime->QuadPart = SystemTime->QuadPart -
TimeInformation.TimeZoneBias.QuadPart;
return STATUS_SUCCESS;
}
/*
* @implemented
*/
VOID
NTAPI
RtlSecondsSince1970ToTime(IN ULONG SecondsSince1970,
OUT PLARGE_INTEGER Time)
{
Time->QuadPart = ((LONGLONG)SecondsSince1970 * TICKSPERSEC) + TICKSTO1970;
}
/*
* @implemented
*/
VOID NTAPI
RtlSecondsSince1980ToTime(IN ULONG SecondsSince1980,
OUT PLARGE_INTEGER Time)
{
Time->QuadPart = ((LONGLONG)SecondsSince1980 * TICKSPERSEC) + TICKSTO1980;
}
/* EOF */
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