/* $Id$
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 "../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);
+ 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;
+ int offset = tzinfo.Bias;
if(dst==TIME_ZONE_ID_STANDARD)
- offset+=tzinfo.StandardBias;
+ offset += tzinfo.StandardBias;
else if(dst==TIME_ZONE_ID_DAYLIGHT)
- offset+=tzinfo.DaylightBias;
+ offset += tzinfo.DaylightBias;
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
}
{
ostringstream ss;
ss.fill('0');
- int m=abs(minutes_west);
+ int m = abs(minutes_west);
ss<<"UTC"<<(minutes_west<0 ? '-' : '+')<<m/60;
if(m%60)
ss<<':'<<setw(2)<<m%60;
}
else
- name="UTC";
+ name = "UTC";
}
+TimeZone::TimeZone(int minutes_west, const string &n):
+ name(n),
+ offset(minutes_west*min)
+{ }
+
const TimeZone &TimeZone::utc()
{
static TimeZone tz(0);
const TimeZone &TimeZone::local()
{
- static TimeZone tz=get_local_timezone();
+ static TimeZone tz = get_local_timezone();
return tz;
}