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Simplify time conversion functions.
svn path=/trunk/; revision=12160
This commit is contained in:
Eric Kohl
parent
a2b3047314
commit
ac61295ec2
1 changed files with 56 additions and 91 deletions
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@ -1,4 +1,4 @@
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/* $Id: time.c,v 1.1 2004/05/31 19:29:02 gdalsnes Exp $
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/* $Id: time.c,v 1.2 2004/12/16 23:46:41 ekohl Exp $
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*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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@ -75,78 +75,71 @@ static __inline void NormalizeTimeFields(CSHORT *FieldToNormalize,
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BOOLEAN
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STDCALL
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RtlTimeFieldsToTime(
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PTIME_FIELDS tfTimeFields,
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PTIME_FIELDS TimeFields,
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PLARGE_INTEGER Time)
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{
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int CurYear;
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int CurMonth;
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#if defined(__GNUC__)
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TIME_FIELDS IntTimeFields;
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long long int rcTime;
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#else
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Time->QuadPart = 0;
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memcpy(&IntTimeFields,
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TimeFields,
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sizeof(TIME_FIELDS));
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__int64 rcTime;
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#endif
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TIME_FIELDS TimeFields = *tfTimeFields;
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rcTime = 0;
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/* FIXME: normalize the TIME_FIELDS structure here */
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while (TimeFields.Second >= SECSPERMIN)
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/* Normalize the TIME_FIELDS structure here */
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while (IntTimeFields.Second >= SECSPERMIN)
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{
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NormalizeTimeFields(&TimeFields.Second,
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&TimeFields.Minute,
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NormalizeTimeFields(&IntTimeFields.Second,
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&IntTimeFields.Minute,
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SECSPERMIN);
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}
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while (TimeFields.Minute >= MINSPERHOUR)
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while (IntTimeFields.Minute >= MINSPERHOUR)
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{
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NormalizeTimeFields(&TimeFields.Minute,
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&TimeFields.Hour,
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NormalizeTimeFields(&IntTimeFields.Minute,
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&IntTimeFields.Hour,
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MINSPERHOUR);
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}
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while (TimeFields.Hour >= HOURSPERDAY)
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while (IntTimeFields.Hour >= HOURSPERDAY)
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{
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NormalizeTimeFields(&TimeFields.Hour,
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&TimeFields.Day,
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NormalizeTimeFields(&IntTimeFields.Hour,
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&IntTimeFields.Day,
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HOURSPERDAY);
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}
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while (TimeFields.Day >
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MonthLengths[IsLeapYear(TimeFields.Year)][TimeFields.Month - 1])
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while (IntTimeFields.Day >
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MonthLengths[IsLeapYear(IntTimeFields.Year)][IntTimeFields.Month - 1])
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{
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NormalizeTimeFields(&TimeFields.Day,
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&TimeFields.Month,
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NormalizeTimeFields(&IntTimeFields.Day,
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&IntTimeFields.Month,
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SECSPERMIN);
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}
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while (TimeFields.Month > MONSPERYEAR)
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while (IntTimeFields.Month > MONSPERYEAR)
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{
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NormalizeTimeFields(&TimeFields.Month,
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&TimeFields.Year,
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NormalizeTimeFields(&IntTimeFields.Month,
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&IntTimeFields.Year,
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MONSPERYEAR);
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}
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/* FIXME: handle calendar corrections here */
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for (CurYear = EPOCHYEAR; CurYear < TimeFields.Year; CurYear++)
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/* Compute the time */
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for (CurYear = EPOCHYEAR; CurYear < IntTimeFields.Year; CurYear++)
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{
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rcTime += YearLengths[IsLeapYear(CurYear)];
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Time->QuadPart += YearLengths[IsLeapYear(CurYear)];
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}
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for (CurMonth = 1; CurMonth < TimeFields.Month; CurMonth++)
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for (CurMonth = 1; CurMonth < IntTimeFields.Month; CurMonth++)
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{
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rcTime += MonthLengths[IsLeapYear(CurYear)][CurMonth - 1];
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Time->QuadPart += MonthLengths[IsLeapYear(CurYear)][CurMonth - 1];
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}
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rcTime += TimeFields.Day - 1;
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rcTime *= SECSPERDAY;
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rcTime += TimeFields.Hour * SECSPERHOUR + TimeFields.Minute * SECSPERMIN +
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TimeFields.Second;
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rcTime *= TICKSPERSEC;
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rcTime += TimeFields.Milliseconds * TICKSPERMSEC;
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*Time = *(LARGE_INTEGER *)&rcTime;
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Time->QuadPart += IntTimeFields.Day - 1;
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Time->QuadPart *= SECSPERDAY;
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Time->QuadPart += IntTimeFields.Hour * SECSPERHOUR + IntTimeFields.Minute * SECSPERMIN +
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IntTimeFields.Second;
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Time->QuadPart *= TICKSPERSEC;
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Time->QuadPart += IntTimeFields.Milliseconds * TICKSPERMSEC;
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return TRUE;
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}
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/*
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* @implemented
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*/
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@ -185,44 +178,30 @@ RtlTimeToElapsedTimeFields(IN PLARGE_INTEGER Time,
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}
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/*
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* @unimplemented
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*/
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VOID
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STDCALL
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RtlTimeToTimeFields(
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PLARGE_INTEGER liTime,
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PLARGE_INTEGER Time,
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PTIME_FIELDS TimeFields)
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{
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const int *Months;
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int LeapSecondCorrections, SecondsInDay, CurYear;
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int LeapYear, CurMonth, GMTOffset;
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int SecondsInDay, CurYear;
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int LeapYear, CurMonth;
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long int Days;
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#if defined(__GNUC__)
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long long int Time = (long long int)liTime->QuadPart;
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#else
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__int64 Time = (__int64)liTime->QuadPart;
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#endif
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LONGLONG IntTime = (LONGLONG)Time->QuadPart;
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/* Extract millisecond from time and convert time into seconds */
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TimeFields->Milliseconds = (CSHORT) ((Time % TICKSPERSEC) / TICKSPERMSEC);
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Time = Time / TICKSPERSEC;
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/* FIXME: Compute the number of leap second corrections here */
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LeapSecondCorrections = 0;
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/* FIXME: get the GMT offset here */
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GMTOffset = 0;
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TimeFields->Milliseconds = (CSHORT) ((IntTime % TICKSPERSEC) / TICKSPERMSEC);
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IntTime = IntTime / TICKSPERSEC;
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/* Split the time into days and seconds within the day */
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Days = Time / SECSPERDAY;
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SecondsInDay = Time % SECSPERDAY;
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Days = IntTime / SECSPERDAY;
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SecondsInDay = IntTime % SECSPERDAY;
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/* Adjust the values for GMT and leap seconds */
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SecondsInDay += (GMTOffset - LeapSecondCorrections);
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/* Adjust the values for days and seconds in day */
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while (SecondsInDay < 0)
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{
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SecondsInDay += SECSPERDAY;
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@ -240,8 +219,6 @@ RtlTimeToTimeFields(
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TimeFields->Minute = (CSHORT) (SecondsInDay / SECSPERMIN);
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TimeFields->Second = (CSHORT) (SecondsInDay % SECSPERMIN);
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/* FIXME: handle the possibility that we are on a leap second (i.e. Second = 60) */
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/* compute day of week */
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TimeFields->Weekday = (CSHORT) ((EPOCHWEEKDAY + Days) % DAYSPERWEEK);
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@ -285,15 +262,15 @@ RtlTimeToSecondsSince1970(
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PLARGE_INTEGER Time,
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PULONG SecondsSince1970)
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{
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LARGE_INTEGER liTime;
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LARGE_INTEGER IntTime;
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liTime.QuadPart = Time->QuadPart - TICKSTO1970;
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liTime.QuadPart = liTime.QuadPart / TICKSPERSEC;
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IntTime.QuadPart = Time->QuadPart - TICKSTO1970;
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IntTime.QuadPart = IntTime.QuadPart / TICKSPERSEC;
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if (liTime.u.HighPart != 0)
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if (IntTime.u.HighPart != 0)
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return FALSE;
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*SecondsSince1970 = liTime.u.LowPart;
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*SecondsSince1970 = IntTime.u.LowPart;
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return TRUE;
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}
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@ -308,15 +285,15 @@ RtlTimeToSecondsSince1980(
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PLARGE_INTEGER Time,
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PULONG SecondsSince1980)
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{
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LARGE_INTEGER liTime;
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LARGE_INTEGER IntTime;
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liTime.QuadPart = Time->QuadPart - TICKSTO1980;
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liTime.QuadPart = liTime.QuadPart / TICKSPERSEC;
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IntTime.QuadPart = Time->QuadPart - TICKSTO1980;
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IntTime.QuadPart = IntTime.QuadPart / TICKSPERSEC;
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if (liTime.u.HighPart != 0)
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if (IntTime.u.HighPart != 0)
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return FALSE;
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*SecondsSince1980 = liTime.u.LowPart;
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*SecondsSince1980 = IntTime.u.LowPart;
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return TRUE;
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}
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@ -347,8 +324,6 @@ RtlLocalTimeToSystemTime(PLARGE_INTEGER LocalTime,
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}
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/*
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* @implemented
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*/
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@ -383,11 +358,7 @@ RtlSecondsSince1970ToTime(
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ULONG SecondsSince1970,
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PLARGE_INTEGER Time)
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{
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LONGLONG llTime;
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llTime = (SecondsSince1970 * TICKSPERSEC) + TICKSTO1970;
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*Time = *(LARGE_INTEGER *)&llTime;
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Time->QuadPart = ((LONGLONG)SecondsSince1970 * TICKSPERSEC) + TICKSTO1970;
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}
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@ -400,13 +371,7 @@ RtlSecondsSince1980ToTime(
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ULONG SecondsSince1980,
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PLARGE_INTEGER Time)
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{
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LONGLONG llTime;
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llTime = (SecondsSince1980 * TICKSPERSEC) + TICKSTO1980;
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*Time = *(LARGE_INTEGER *)&llTime;
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Time->QuadPart = ((LONGLONG)SecondsSince1980 * TICKSPERSEC) + TICKSTO1980;
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}
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/* EOF */
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