/* $Id$
This file is part of libmspcore
-Copyright © 2008 Mikko Rasa, Mikkosoft Productions
+Copyright © 2008-2009 Mikko Rasa, Mikkosoft Productions
Distributed under the LGPL
*/
#include <cstdlib>
#include <sstream>
#include <iomanip>
-#include <time.h>
+#ifdef WIN32
+#include <windows.h>
+#else
+#include <fcntl.h>
+#endif
+#include <msp/core/except.h>
+#include "timestamp.h"
#include "timezone.h"
#include "units.h"
+#include "utils.h"
using namespace std;
using Msp::Time::TimeZone;
+#ifndef WIN32
+long get_long(char *&ptr)
+{
+ long result=0;
+ for(unsigned i=0; i<4; ++i)
+ result=(result<<8)+static_cast<unsigned char >(*ptr++);
+ return result;
+}
+#endif
+
TimeZone get_local_timezone()
{
#ifdef WIN32
TIME_ZONE_INFORMATION tzinfo;
DWORD dst=GetTimeZoneInformation(&tzinfo);
if(dst==TIME_ZONE_ID_INVALID)
- throw SystemError("Failed to get time zone information", GetLastError());
+ throw Msp::SystemError("Failed to get time zone information", GetLastError());
int offset=tzinfo.Bias;
if(dst==TIME_ZONE_ID_STANDARD)
return TimeZone(offset);
#else
- tzset();
- return TimeZone(timezone/60);
+ int fd=open("/etc/localtime", O_RDONLY);
+ if(fd>=-1)
+ {
+ char hdr[44];
+ int len=read(fd, hdr, sizeof(hdr));
+ long gmtoff=-1;
+ string name;
+ if(len==44 && hdr[0]=='T' && hdr[1]=='Z' && hdr[2]=='i' && hdr[3]=='f')
+ {
+ char *ptr=hdr+20;
+ long isgmtcnt=get_long(ptr);
+ long isstdcnt=get_long(ptr);
+ long leapcnt=get_long(ptr);
+ long timecnt=get_long(ptr);
+ long typecnt=get_long(ptr);
+ long charcnt=get_long(ptr);
+ int size=timecnt*5+typecnt*6+isgmtcnt+isstdcnt+leapcnt*8+charcnt;
+ char buf[size];
+ len=read(fd, buf, size);
+ if(len==size)
+ {
+ ptr=buf;
+ int index=-1;
+ time_t cur_time=Msp::Time::now().to_unixtime();
+ for(int i=0; i<timecnt; ++i)
+ if(get_long(ptr)<=cur_time)
+ index=i;
+
+ if(index>0)
+ index=ptr[index];
+ ptr+=timecnt;
+
+ int abbrind=0;
+ for(int i=0; i<typecnt; ++i)
+ {
+ if((index>=0 && i==index) || (index<0 && !ptr[4] && gmtoff==-1))
+ {
+ gmtoff=get_long(ptr);
+ ++ptr;
+ abbrind=*ptr++;
+ }
+ else
+ ptr+=6;
+ }
+
+ name=ptr+abbrind;
+ }
+ }
+ close(fd);
+
+ if(gmtoff!=-1)
+ return TimeZone(-gmtoff/60, name);
+ }
+ return TimeZone();
#endif
}
name="UTC";
}
+TimeZone::TimeZone(int minutes_west, const string &n):
+ name(n),
+ offset(minutes_west*min)
+{ }
+
const TimeZone &TimeZone::utc()
{
static TimeZone tz(0);