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function getfilesystemtime: change the way to convert FILE struct to __int64 #89

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function getfilesystemtime: change the way to convert FILE struct to __int64 #89

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14 changes: 12 additions & 2 deletions win32/time.c
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Original file line number Diff line number Diff line change
@@ -1,4 +1,3 @@

/*****************************************************************************
* *
* DH_TIME.C *
Expand Down Expand Up @@ -37,10 +36,21 @@ int getfilesystemtime(struct timeval *time_Info)
{
FILETIME ft;
__int64 ff;
ULARGE_INTEGER convFromft;

GetSystemTimeAsFileTime(&ft); /* 100 ns blocks since 01-Jan-1641 */
/* resolution seems to be 0.01 sec */
ff = *(__int64*)(&ft);
/* ff = *(__int64*)(&ft); */
/*
Do not cast a pointer to a FILETIME structure to either a
ULARGE_INTEGER* or __int64* value because it can cause alignment faults on 64-bit Windows.

via http://technet.microsoft.com/en-us/library/ms724284(v=vs.85).aspx
*/
convFromft.HighPart = ft.dwHighDateTime;
convFromft.LowPart = ft.dwLowDateTime;
ff = convFromft.QuadPart;

time_Info->tv_sec = (int)(ff/(__int64)10000000-(__int64)11644473600);
time_Info->tv_usec = (int)(ff % 10000000)/10;
return 0;
Expand Down