Load time-zones from UTF-8 paths correctly

Use _wfopen on Windows, after converting UTF-8 paths to wchar

simgear/timing/lowleveltime.cxx

@@ -42,6 +42,7 @@
 #include <limits.h>
 
 #include <simgear/structure/exception.hxx>
+#include <simgear/misc/strutils.hxx>
 
 #include "lowleveltime.h"
 
@@ -857,7 +858,12 @@ void fgtzfile_read (const char *file)
 //       file = _new;
 //     }
 
-  f = fopen (file, "rb");
+#if defined(SG_WINDOWS)
+  const std::wstring wfile = simgear::strutils::convertUtf8ToWString(file);
+  f = _wfopen(wfile.c_str(), L"rb");
+#else
+  f = fopen(file, "rb");
+#endif
 
   if (f == NULL) {
       perror( "fgtzfile_read(): " );

simgear/timing/sg_time.cxx

@@ -86,7 +86,7 @@ void SGTime::init( const SGGeod& location, const SGPath& root, time_t init_time
             SGPath zone( root );
             zone.append( "zone.tab" );
             SG_LOG( SG_EVENT, SG_INFO, "Reading timezone info from: " << zone );
-            std::string zs = zone.local8BitStr();
+            std::string zs = zone.utf8Str();
             static_tzContainer.reset(new SGTimeZoneContainer( zs.c_str() ));
         }
 
@@ -243,7 +243,7 @@ void SGTime::updateLocal( const SGGeod& aLocation, const SGPath& root ) {
     }
 
     currGMT = sgTimeGetGMT( gmtime(&cur_time) );
-    std::string zs = zone.local8BitStr();
+    std::string zs = zone.utf8Str();
     aircraftLocalTime = sgTimeGetGMT( (fgLocaltime(&cur_time, zs.c_str())) );
     local_offset = aircraftLocalTime - currGMT;
     // cout << "Using " << local_offset << " as local time offset Timezone is " 

simgear/timing/timezone.cxx

@@ -36,6 +36,7 @@
 #include <cstdlib>
 
 #include <simgear/structure/exception.hxx>
+#include <simgear/misc/strutils.hxx>
 
 #include "timezone.h"
 
@@ -134,7 +135,12 @@ SGTimeZone::SGTimeZone(const SGTimeZone& other)
 SGTimeZoneContainer::SGTimeZoneContainer(const char *filename)
 {
     char buffer[256];
-    FILE* infile = fopen(filename, "rb");
+#if defined(SG_WINDOWS)
+  const std::wstring wfile = simgear::strutils::convertUtf8ToWString(filename);
+  FILE* infile = _wfopen(wfile.c_str(), L"rb");
+#else
+  FILE* infile = fopen(filename, "rb");
+#endif
     if (!(infile)) {
         std::string e = "Unable to open time zone file '";
         throw sg_exception(e + filename + '\'');