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A couple of optimizations and bug fixes.

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This commit is contained in:
Alexandre Julliard 2004-04-02 20:28:07 +00:00
parent 2d91357831
commit 9aef0770a9
1 changed files with 14 additions and 12 deletions
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26
dlls/ntdll/time.c
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@ -298,6 +298,12 @@ static const int MonthLengths[2][MONSPERYEAR] =
{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }
};
static const int YearDays[2][MONSPERYEAR+1] =
{
{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
};
static inline int IsLeapYear(int Year)
{
return Year % 4 == 0 && (Year % 100 != 0 || Year % 400 == 0) ? 1 : 0;
@ -359,7 +365,6 @@ VOID WINAPI RtlTimeToTimeFields(
const LARGE_INTEGER *liTime,
PTIME_FIELDS TimeFields)
{
const int *Months;
int SecondsInDay, DeltaYear;
int LeapYear, CurMonth;
long int Days;
@ -404,11 +409,10 @@ VOID WINAPI RtlTimeToTimeFields(
LeapYear = IsLeapYear(TimeFields->Year);
/* Compute month of year */
Months = MonthLengths[LeapYear];
for (CurMonth = 0; Days >= (long) Months[CurMonth]; CurMonth++)
Days = Days - (long) Months[CurMonth];
TimeFields->Month = (CSHORT) (CurMonth + 1);
TimeFields->Day = (CSHORT) (Days + 1);
CurMonth = 1;
while (Days >= YearDays[LeapYear][CurMonth]) CurMonth++;
TimeFields->Day = Days - YearDays[LeapYear][CurMonth-1] + 1;
TimeFields->Month = CurMonth;
}
/******************************************************************************
@ -428,7 +432,7 @@ BOOLEAN WINAPI RtlTimeFieldsToTime(
PTIME_FIELDS tfTimeFields,
PLARGE_INTEGER Time)
{
int CurYear, CurMonth, DeltaYear;
int CurYear, DeltaYear;
LONGLONG rcTime;
TIME_FIELDS TimeFields = *tfTimeFields;
@ -445,7 +449,8 @@ BOOLEAN WINAPI RtlTimeFieldsToTime(
{ NormalizeTimeFields(&TimeFields.Hour, &TimeFields.Day, HOURSPERDAY);
}
while (TimeFields.Day > MonthLengths[IsLeapYear(TimeFields.Year)][TimeFields.Month - 1])
{ NormalizeTimeFields(&TimeFields.Day, &TimeFields.Month, SECSPERMIN);
{ NormalizeTimeFields(&TimeFields.Day, &TimeFields.Month,
MonthLengths[IsLeapYear(TimeFields.Year)][TimeFields.Month - 1]);
}
while (TimeFields.Month > MONSPERYEAR)
{ NormalizeTimeFields(&TimeFields.Month, &TimeFields.Year, MONSPERYEAR);
@ -463,10 +468,7 @@ BOOLEAN WINAPI RtlTimeFieldsToTime(
CurYear -= DeltaYear * 4;
rcTime += DeltaYear * DAYSPERNORMALQUADRENNIUM;
rcTime += CurYear * DAYSPERNORMALYEAR;
for (CurMonth = 1; CurMonth < TimeFields.Month; CurMonth++)
{ rcTime += MonthLengths[IsLeapYear(TimeFields.Year)][CurMonth - 1];
}
rcTime += YearDays[IsLeapYear(TimeFields.Year)][TimeFields.Month - 1];
rcTime += TimeFields.Day - 1;
rcTime *= SECSPERDAY;
rcTime += TimeFields.Hour * SECSPERHOUR + TimeFields.Minute * SECSPERMIN + TimeFields.Second;