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osdTime: win32 use C89 localtime/gmtime

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as recommended by Freddie Akeroyd
This commit is contained in:
Michael Davidsaver
2015-12-21 11:15:04 -05:00
parent 05d3dbf453
commit 2d9c529f5e
1 changed files with 13 additions and 130 deletions
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143
src/libCom/osi/os/WIN32/osdTime.cpp
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@@ -121,148 +121,31 @@ static int osdTimeGetCurrent ( epicsTimeStamp *pDest )
return epicsTimeOK;
}
inline void UnixTimeToFileTime ( const time_t * pAnsiTime, LPFILETIME pft )
{
LONGLONG ll = Int32x32To64 ( *pAnsiTime, 10000000 ) + LL_CONSTANT(116444736000000000);
pft->dwLowDateTime = static_cast < DWORD > ( ll );
pft->dwHighDateTime = static_cast < DWORD > ( ll >>32 );
}
static int daysInMonth[] = { 31, 28, 31, 30, 31, 30, 31,
31, 30, 31, 30, 31 };
static bool isLeapYear ( DWORD year )
{
if ( (year % 4) == 0 ) {
return ( ( year % 100 ) != 0 || ( year % 400 ) == 0 );
} else {
return false;
}
}
static int dayOfYear ( DWORD day, DWORD month, DWORD year )
{
DWORD nDays = 0;
for ( unsigned m = 1; m < month; m++ ) {
nDays += daysInMonth[m-1];
if ( m == 2 && isLeapYear(year) ) {
nDays++;
}
}
return nDays + day;
}
// synthesize a reentrant gmtime on WIN32
int epicsShareAPI epicsTime_gmtime ( const time_t *pAnsiTime, struct tm *pTM )
{
FILETIME ft;
UnixTimeToFileTime ( pAnsiTime, &ft );
SYSTEMTIME st;
BOOL status = FileTimeToSystemTime ( &ft, &st );
if ( ! status ) {
return epicsTimeERROR;
struct tm * pRet = gmtime ( pAnsiTime );
if ( pRet ) {
*pTM = *pRet;
return epicsTimeOK;
}
else {
return errno;
}
pTM->tm_sec = st.wSecond; // seconds after the minute - [0,59]
pTM->tm_min = st.wMinute; // minutes after the hour - [0,59]
pTM->tm_hour = st.wHour; // hours since midnight - [0,23]
assert ( st.wDay >= 1 && st.wDay <= 31 );
pTM->tm_mday = st.wDay; // day of the month - [1,31]
assert ( st.wMonth >= 1 && st.wMonth <= 12 );
pTM->tm_mon = st.wMonth - 1; // months since January - [0,11]
assert ( st.wYear >= 1900 );
pTM->tm_year = st.wYear - 1900; // years since 1900
pTM->tm_wday = st.wDayOfWeek; // days since Sunday - [0,6]
pTM->tm_yday = dayOfYear ( st.wDay, st.wMonth, st.wYear ) - 1;
pTM->tm_isdst = 0;
return epicsTimeOK;
}
// synthesize a reentrant localtime on WIN32
int epicsShareAPI epicsTime_localtime (
const time_t * pAnsiTime, struct tm * pTM )
{
FILETIME ft;
UnixTimeToFileTime ( pAnsiTime, & ft );
TIME_ZONE_INFORMATION tzInfo;
DWORD tzStatus = GetTimeZoneInformation ( & tzInfo );
if ( tzStatus == TIME_ZONE_ID_INVALID ) {
return epicsTimeERROR;
struct tm * pRet = localtime ( pAnsiTime );
if ( pRet ) {
*pTM = *pRet;
return epicsTimeOK;
}
//
// There are remarkable weaknessess in the FileTimeToLocalFileTime
// interface so we dont use it here. Unfortunately, there is no
// corresponding function that works on file time.
//
SYSTEMTIME st;
BOOL success = FileTimeToSystemTime ( & ft, & st );
if ( ! success ) {
return epicsTimeERROR;
else {
return errno;
}
SYSTEMTIME lst;
success = SystemTimeToTzSpecificLocalTime (
& tzInfo, & st, & lst );
if ( ! success ) {
return epicsTimeERROR;
}
//
// We must convert back to file time so that we can determine if DST
// is active...
//
FILETIME lft;
success = SystemTimeToFileTime ( & lst, & lft );
if ( ! success ) {
return epicsTimeERROR;
}
int is_dst = -1; // unknown state of dst
if ( tzStatus != TIME_ZONE_ID_UNKNOWN &&
tzInfo.StandardDate.wMonth != 0 &&
tzInfo.DaylightDate.wMonth != 0) {
// determine if the specified date is
// in daylight savings time
tzInfo.StandardDate.wYear = st.wYear;
FILETIME StandardDateFT;
success = SystemTimeToFileTime (
& tzInfo.StandardDate, & StandardDateFT );
if ( ! success ) {
return epicsTimeERROR;
}
tzInfo.DaylightDate.wYear = st.wYear;
FILETIME DaylightDateFT;
success = SystemTimeToFileTime (
& tzInfo.DaylightDate, & DaylightDateFT );
if ( ! success ) {
return epicsTimeERROR;
}
if ( CompareFileTime ( & lft, & DaylightDateFT ) >= 0
&& CompareFileTime ( & lft, & StandardDateFT ) < 0 ) {
is_dst = 1;
}
else {
is_dst = 0;
}
}
pTM->tm_sec = lst.wSecond; // seconds after the minute - [0,59]
pTM->tm_min = lst.wMinute; // minutes after the hour - [0,59]
pTM->tm_hour = lst.wHour; // hours since midnight - [0,23]
assert ( lst.wDay >= 1 && lst.wDay <= 31 );
pTM->tm_mday = lst.wDay; // day of the month - [1,31]
assert ( lst.wMonth >= 1 && lst.wMonth <= 12 );
pTM->tm_mon = lst.wMonth - 1; // months since January - [0,11]
assert ( lst.wYear >= 1900 );
pTM->tm_year = lst.wYear - 1900; // years since 1900
pTM->tm_wday = lst.wDayOfWeek; // days since Sunday - [0,6]
pTM->tm_yday = dayOfYear ( lst.wDay, lst.wMonth, lst.wYear ) - 1;
pTM->tm_isdst = is_dst;
return epicsTimeOK;
}
currentTime::currentTime () :