X-Git-Url: http://git.tdb.fi/?p=libs%2Fcore.git;a=blobdiff_plain;f=source%2Ftime%2Funix%2Ftimezone.cpp;fp=source%2Ftime%2Funix%2Ftimezone.cpp;h=e55969c8854711e0e23a1dff3b510e755422126d;hp=0000000000000000000000000000000000000000;hb=609c9a508cfdc7b42c46c4f21d17639204165a00;hpb=b4806214e905752617691f851717033fd3f266c2

diff --git a/source/time/unix/timezone.cpp b/source/time/unix/timezone.cpp
new file mode 100644
index 0000000..e55969c
--- /dev/null
+++ b/source/time/unix/timezone.cpp
@@ -0,0 +1,85 @@
+#include <unistd.h>
+#include <fcntl.h>
+#include "timestamp.h"
+#include "timezone.h"
+#include "utils.h"
+
+using namespace std;
+
+namespace {
+
+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;
+}
+
+}
+
+
+namespace Msp {
+namespace Time {
+
+TimeZone TimeZone::platform_get_local_timezone()
+{
+	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 = new char[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;
+			}
+			delete[] buf;
+		}
+		close(fd);
+
+		if(gmtoff!=-1)
+			return TimeZone(gmtoff/60, name);
+	}
+	return TimeZone();
+}
+
+} // namespace Time
+} // namespace Msp