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/*
Miranda IM: the free IM client for Microsoft* Windows*
Copyright 2000-2003 Miranda ICQ/IM project,
all portions of this codebase are copyrighted to the people
listed in contributors.txt.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "commonheaders.h"
static int daysInMonth[12]={31,28,31,30,31,30,31,31,30,31,30,31};
static int IsLeapYear(int year)
{
if(year&3) return 0;
if(year%100) return 1;
if(year%400) return 0;
return 1;
}
static int CompareSystemTimes(SYSTEMTIME *st,SYSTEMTIME *switchDate)
{
FILETIME ft1,ft2;
if(switchDate->wYear==0) { //strange day-in-month thing
SYSTEMTIME tempst;
//short-circuit if the months aren't the same
if(st->wMonth<switchDate->wMonth) return -1;
if(st->wMonth>switchDate->wMonth) return 1;
tempst=*switchDate;
tempst.wYear=st->wYear;
tempst.wDay=1;
SystemTimeToFileTime(&tempst,&ft1);
FileTimeToSystemTime(&ft1,&tempst); //gets the day of week of the first of the month
tempst.wDay=1+(7+switchDate->wDayOfWeek-tempst.wDayOfWeek)%7;
if(switchDate->wDay==5) { //last wDayOfWeek in month
if(tempst.wMonth==2) {
if(IsLeapYear(tempst.wYear)) daysInMonth[1]=29;
else daysInMonth[1]=28;
}
tempst.wDay+=7*3; //can't be less than 4 of that day in the month
if(tempst.wDay+7<=daysInMonth[switchDate->wMonth-1]) tempst.wDay+=7;
}
else tempst.wDay+=7*(switchDate->wDay-1); //nth of month
SystemTimeToFileTime(&tempst,&ft2);
}
else {
switchDate->wYear=st->wYear;
SystemTimeToFileTime(switchDate,&ft2);
}
SystemTimeToFileTime(st,&ft1);
return CompareFileTime(&ft1,&ft2);
}
static int TimestampToLocal(WPARAM wParam,LPARAM lParam)
{
TIME_ZONE_INFORMATION tzInfo;
LARGE_INTEGER liFiletime;
FILETIME filetime;
SYSTEMTIME st;
GetTimeZoneInformation(&tzInfo);
if(tzInfo.StandardDate.wMonth==0) { //no daylight savings time
return (int)(wParam-tzInfo.Bias*60);
}
//this huge number is the difference between 1970 and 1601 in seconds
liFiletime.QuadPart=(mir_i64(11644473600)+(__int64)wParam)*10000000;
filetime.dwHighDateTime=liFiletime.HighPart;
filetime.dwLowDateTime=liFiletime.LowPart;
FileTimeToSystemTime(&filetime,&st);
if(tzInfo.DaylightDate.wMonth<tzInfo.StandardDate.wMonth) {
//northern hemisphere
if(CompareSystemTimes(&st,&tzInfo.DaylightDate)<0 ||
CompareSystemTimes(&st,&tzInfo.StandardDate)>0) {
return (int)(wParam-(tzInfo.Bias+tzInfo.StandardBias)*60);
}
return (int)(wParam-(tzInfo.Bias+tzInfo.DaylightBias)*60);
}
else {
//southern hemisphere
if(CompareSystemTimes(&st,&tzInfo.StandardDate)<0 ||
CompareSystemTimes(&st,&tzInfo.DaylightDate)>0) {
return (int)(wParam-(tzInfo.Bias+tzInfo.DaylightBias)*60);
}
return (int)(wParam-(tzInfo.Bias+tzInfo.StandardBias)*60);
}
return 0;
}
static int TimestampToString(WPARAM wParam,LPARAM lParam)
{
DBTIMETOSTRING *tts=(DBTIMETOSTRING*)lParam;
LARGE_INTEGER liFiletime;
FILETIME filetime;
SYSTEMTIME st;
char dateTimeStr[64];
char *pDest,*pFormat;
int destCharsLeft,dateTimeStrLen;
//this huge number is the difference between 1970 and 1601 in seconds
liFiletime.QuadPart=(mir_i64(11644473600)+(__int64)(DWORD)TimestampToLocal(wParam,0))*10000000;
filetime.dwHighDateTime=liFiletime.HighPart;
filetime.dwLowDateTime=liFiletime.LowPart;
FileTimeToSystemTime(&filetime,&st);
destCharsLeft=tts->cbDest;
for(pFormat=tts->szFormat,pDest=tts->szDest;*pFormat;pFormat++) {
switch(*pFormat) {
case 't':
GetTimeFormat(LOCALE_USER_DEFAULT,TIME_NOSECONDS,&st,NULL,dateTimeStr,sizeof(dateTimeStr));
break;
case 's':
GetTimeFormat(LOCALE_USER_DEFAULT,0,&st,NULL,dateTimeStr,sizeof(dateTimeStr));
break;
case 'm':
GetTimeFormat(LOCALE_USER_DEFAULT,TIME_NOMINUTESORSECONDS,&st,NULL,dateTimeStr,sizeof(dateTimeStr));
break;
case 'd':
GetDateFormat(LOCALE_USER_DEFAULT,DATE_SHORTDATE,&st,NULL,dateTimeStr,sizeof(dateTimeStr));
break;
case 'D':
GetDateFormat(LOCALE_USER_DEFAULT,DATE_LONGDATE,&st,NULL,dateTimeStr,sizeof(dateTimeStr));
break;
default:
if(destCharsLeft) {
*pDest++=*pFormat;
destCharsLeft--;
}
continue;
}
dateTimeStrLen=strlen(dateTimeStr);
if(destCharsLeft<dateTimeStrLen) dateTimeStrLen=destCharsLeft;
CopyMemory(pDest,dateTimeStr,dateTimeStrLen);
destCharsLeft-=dateTimeStrLen;
pDest+=dateTimeStrLen;
}
if(destCharsLeft) *pDest=0;
else tts->szDest[tts->cbDest-1]=0;
return 0;
}
int InitTime(void)
{
CreateServiceFunction(MS_DB_TIME_TIMESTAMPTOLOCAL,TimestampToLocal);
CreateServiceFunction(MS_DB_TIME_TIMESTAMPTOSTRING,TimestampToString);
return 0;
}
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