mirror of
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211 lines
4.7 KiB
C
211 lines
4.7 KiB
C
/* Copyright (c) Robert Walker, support@tunesmithy.co.uk
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* Free source. Do what you wish with it - treat it as you would
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* example code in a book on c programming.
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*/
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#include "time64.h"
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#undef time
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#undef localtime
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#undef mktime
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#undef difftime
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#undef gmtime
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#undef time_t
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#include <time.h>
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#include <windows.h>
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#include <assert.h>
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#define SECS_TO_FT_MULT 10000000
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#ifdef _DEBUG
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#define DEBUG_TIME_T
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#endif
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/* From MSVC help:
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* The gmtime, mktime, and localtime functions use the same single,
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* statically allocated structure to hold their results. Each call to
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* one of these functions destroys the result of any previous call.
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* If timer represents a date before midnight, January 1, 1970,
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* gmtime returns NULL. There is no error return.
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*
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* So here is the struct to use for our 64 bit implementation
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*
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* However, it may be useful to be able to make this thread safe
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*/
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#ifdef USE_THREAD_LOCAL_VARIABLES
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#define TIME64_THREAD_LOCAL _declspec(thread)
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#else
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#define TIME64_THREAD_LOCAL
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#endif
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TIME64_THREAD_LOCAL static struct tm today_ret;
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static void T64ToFileTime(t64 *pt,FILETIME *pft)
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{
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LARGE_INTEGER li;
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li.QuadPart=*pt*SECS_TO_FT_MULT;
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pft->dwLowDateTime=li.LowPart;
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pft->dwHighDateTime=li.HighPart;
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}
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static void FileTimeToT64(FILETIME *pft,t64 *pt)
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{
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LARGE_INTEGER li;
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li.LowPart = pft->dwLowDateTime;
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li.HighPart = pft->dwHighDateTime;
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*pt=li.QuadPart;
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*pt/=SECS_TO_FT_MULT;
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}
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//#define FindTimeTBase() ((t64) 11644473600)
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#define FindTimeTBase() (((__int64)11644)*1000000+473600)
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// calculated using
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/**
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static t64 FindTimeTBase(void)
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{
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// Find 1st Jan 1970 as a FILETIME
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SYSTEMTIME st;
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FILETIME ft;
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memset(&st,0,sizeof(st));
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st.wYear=1970;
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st.wMonth=1;
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st.wDay=1;
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SystemTimeToFileTime(&st, &ft);
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FileTimeToT64(&ft,&tbase);
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return tbase;
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}
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**/
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static void SystemTimeToT64(SYSTEMTIME *pst,t64 *pt)
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{
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FILETIME ft;
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SystemTimeToFileTime(pst, &ft);
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FileTimeToT64(&ft,pt);
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*pt-=FindTimeTBase();
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}
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static void T64ToSystemTime(t64 *pt,SYSTEMTIME *pst)
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{
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FILETIME ft;
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t64 t=*pt;
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t+=FindTimeTBase();
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T64ToFileTime(&t,&ft);
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FileTimeToSystemTime(&ft,pst);
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}
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t64 time_64(t64 *pt)
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{
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t64 t;
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SYSTEMTIME st;
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GetSystemTime(&st);
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SystemTimeToT64(&st,&t);
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#ifdef DEBUG_TIME_T
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{
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time_t t2=time(NULL);
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if(t2>=0)
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//2005 assert(abs(t2-(int)t)<=1);
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assert(abs((long)(t2-(int)t))<=1);
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// the <=1 here is in case the seconds get incremented
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// betweeen the GetSystemTime(..) call and the time(..) call
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}
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#endif
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if(pt)
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*pt=t;
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return t;
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}
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double difftime_64(t64 time1, t64 time0)
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{
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return (double)(time1-time0);
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}
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t64 mktime64( struct tm *today )
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{
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t64 t;
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SYSTEMTIME st;
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st.wDay=(WORD)today->tm_mday;
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st.wDayOfWeek=(WORD)today->tm_wday;
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st.wHour=(WORD)today->tm_hour;
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st.wMinute=(WORD)today->tm_min;
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st.wMonth=(WORD)(today->tm_mon+1);
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st.wSecond=(WORD)today->tm_sec;
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st.wYear=(WORD)(today->tm_year+1900);
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st.wMilliseconds=0;
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SystemTimeToT64(&st,&t);
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return t;
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}
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#define DAY_IN_SECS (60*60*24)
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struct tm *gmtime_64(t64 t)
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{
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SYSTEMTIME st;
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T64ToSystemTime(&t,&st);
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today_ret.tm_wday=st.wDayOfWeek;
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today_ret.tm_min=st.wMinute;
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today_ret.tm_sec=st.wSecond;
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today_ret.tm_mon=st.wMonth-1;
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today_ret.tm_mday=st.wDay;
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today_ret.tm_hour=st.wHour;
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today_ret.tm_year=st.wYear-1900;
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{
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SYSTEMTIME styear;
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t64 t64Year;
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memset(&styear,0,sizeof(styear));
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styear.wYear=st.wYear;
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styear.wMonth=1;
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styear.wDay=1;
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SystemTimeToT64(&styear,&t64Year);
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today_ret.tm_yday=(int)((t-t64Year)/DAY_IN_SECS);
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}
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today_ret.tm_isdst=0;
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#ifdef DEBUG_TIME_T
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{
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struct tm today2;
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long t32=(int)t;
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if(t32>=0)
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{
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//2005 today2=*gmtime(&t32);
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today2=*gmtime((time_t*)&t32);
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assert(today_ret.tm_yday==today2.tm_yday);
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assert(today_ret.tm_wday==today2.tm_wday);
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assert(today_ret.tm_min==today2.tm_min);
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assert(today_ret.tm_sec==today2.tm_sec);
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assert(today_ret.tm_mon==today2.tm_mon);
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assert(today_ret.tm_mday==today2.tm_mday);
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assert(today_ret.tm_hour==today2.tm_hour);
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assert(today_ret.tm_year==today2.tm_year);
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}
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}
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{
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t64 t2=mktime64(&today_ret);
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assert(t2==t);
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}
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#endif
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return &today_ret;
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}
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struct tm *localtime_64(t64 *pt)
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{
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t64 t=*pt;
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FILETIME ft,ftlocal;
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T64ToFileTime(&t,&ft);
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FileTimeToLocalFileTime(&ft,&ftlocal);
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FileTimeToT64(&ftlocal,&t);
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today_ret=*gmtime_64(t);
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{
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TIME_ZONE_INFORMATION TimeZoneInformation;
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switch(GetTimeZoneInformation(&TimeZoneInformation))
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{
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case TIME_ZONE_ID_DAYLIGHT:today_ret.tm_isdst=1;break;
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case TIME_ZONE_ID_STANDARD:today_ret.tm_isdst=0;break;
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case TIME_ZONE_ID_UNKNOWN:today_ret.tm_isdst=-1;break;
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}
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}
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return &today_ret;
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}
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