122 lines
3 KiB
C
122 lines
3 KiB
C
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/***
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*ftime64.c - return system time
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*
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* Copyright (c) 1998-2001, Microsoft Corporation. All rights reserved.
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*
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*Purpose:
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* Returns the system date/time in a structure form.
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*
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*Revision History:
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* 05-22-98 GJF Created.
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*
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*******************************************************************************/
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#include <cruntime.h>
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#include <sys/types.h>
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#include <sys/timeb.h>
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#include <time.h>
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#include <msdos.h>
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#include <dos.h>
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#include <stdlib.h>
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#include <windows.h>
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#include <internal.h>
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/*
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* Number of 100 nanosecond units from 1/1/1601 to 1/1/1970
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*/
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#define EPOCH_BIAS 116444736000000000i64
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/*
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* Union to facilitate converting from FILETIME to unsigned __int64
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*/
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typedef union {
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unsigned __int64 ft_scalar;
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FILETIME ft_struct;
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} FT;
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/*
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* Cache for the minutes count for with DST status was last assessed
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*/
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static __time64_t elapsed_minutes_cache;
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/*
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* Three values of dstflag_cache
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*/
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#define DAYLIGHT_TIME 1
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#define STANDARD_TIME 0
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#define UNKNOWN_TIME -1
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/*
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* Cache for the last determined DST status
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*/
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static int dstflag_cache = UNKNOWN_TIME;
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/***
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*void _ftime(timeptr) - return DOS time in a structure
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*
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*Purpose:
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* returns the current DOS time in a struct timeb structure
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*
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*Entry:
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* struct timeb *timeptr - structure to fill in with time
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*
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*Exit:
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* no return value -- fills in structure
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*
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*Exceptions:
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*
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*******************************************************************************/
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_CRTIMP void __cdecl _ftime64 (
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struct __timeb64 *tp
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)
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{
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FT nt_time;
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__time64_t t;
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TIME_ZONE_INFORMATION tzinfo;
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DWORD tzstate;
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__tzset();
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tp->timezone = (short)(_timezone / 60);
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GetSystemTimeAsFileTime( &(nt_time.ft_struct) );
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/*
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* Obtain the current DST status. Note the status is cached and only
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* updated once per minute, if necessary.
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*/
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if ( (t = (__time64_t)(nt_time.ft_scalar / 600000000i64))
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!= elapsed_minutes_cache )
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{
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if ( (tzstate = GetTimeZoneInformation( &tzinfo )) != 0xFFFFFFFF )
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{
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/*
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* Must be very careful in determining whether or not DST is
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* really in effect.
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*/
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if ( (tzstate == TIME_ZONE_ID_DAYLIGHT) &&
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(tzinfo.DaylightDate.wMonth != 0) &&
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(tzinfo.DaylightBias != 0) )
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dstflag_cache = DAYLIGHT_TIME;
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else
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/*
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* When in doubt, assume standard time
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*/
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dstflag_cache = STANDARD_TIME;
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}
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else
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dstflag_cache = UNKNOWN_TIME;
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elapsed_minutes_cache = t;
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}
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tp->dstflag = (short)dstflag_cache;
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tp->millitm = (unsigned short)((nt_time.ft_scalar / 10000i64) %
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1000i64);
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tp->time = (__time64_t)((nt_time.ft_scalar - EPOCH_BIAS) / 10000000i64);
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}
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