From Chris Hanson, " Add support for requesting and setting the current directory (a la getcwd/chdir) via a

C++-friendly string-class API.

 Prevent osgDB::concatPaths from faulting if the supplied "left" path string is empty."

src/osgDB/FileNameUtils.cpp

@@ -250,6 +250,10 @@ std::string osgDB::concatPaths(const std::string& left, const std::string& right
     const char delimiterForeign = '\\';
 #endif
 
+    if(left.empty())
+    {
+        return(right);
+    }
     char lastChar = left[left.size() - 1];
 
     if(lastChar == delimiterNative)

src/osgDB/FileUtils.cpp

@@ -11,6 +11,15 @@
  * OpenSceneGraph Public License for more details.
 */
 
+// handle TCHAR type on various platforms
+// #ifndef is inspired by https://svn.apache.org/repos/asf/logging/log4cxx/tags/v0_9_4/include/log4cxx/helpers/tchar.h
+// defining type as plain char is from unzip.h, line 64
+
+#ifndef TCHAR
+typedef char TCHAR;
+#endif
+
+
 // currently this impl is for _all_ platforms, except as defined.
 // the mac version will change soon to reflect the path scheme under osx, but
 // for now, the above include is commented out, and the below code takes precedence.
@@ -194,6 +203,42 @@ bool osgDB::makeDirectoryForFile( const std::string &path )
     return makeDirectory( getFilePath( path ));
 }
 
+
+std::string osgDB::getCurrentWorkingDirectory( void )
+{
+    // MAX_PATH/cwd inspired by unzip.cpp
+#ifndef MAX_PATH
+    #define MAX_PATH 1024
+#endif
+    TCHAR rootdir[MAX_PATH];
+    if(getcwd(rootdir,MAX_PATH-1))
+    {
+        return(rootdir);
+    }
+    return("");
+}// osgDB::getCurrentWorkingDirectory
+
+
+
+bool osgDB::setCurrentWorkingDirectory( const std::string &newCurrentWorkingDirectory )
+{
+    if (newCurrentWorkingDirectory.empty())
+    {
+        osg::notify(osg::DEBUG_INFO) << "osgDB::setCurrentWorkingDirectory(): called with empty string." << std::endl;
+        return false;
+    }
+    
+#ifdef OSG_USE_UTF8_FILENAME
+    return _wchdir( OSGDB_STRING_TO_FILENAME(newCurrentWorkingDirectory).c_str()) == 0;
+#else
+    return chdir( newCurrentWorkingDirectory.c_str()) == 0;
+#endif
+
+    return true;
+} // osgDB::setCurrentWorkingDirectory
+
+
+
 void osgDB::convertStringPathIntoFilePathList(const std::string& paths,FilePathList& filepath)
 {
 #if defined(WIN32) && !defined(__CYGWIN__)