issue 1253 - prevent multiple logins with same username

src/World.cpp

@@ -3666,3 +3666,15 @@ void cWorld::cChunkGeneratorCallbacks::CallHookChunkGenerated (cChunkDesc & a_Ch
 
 
 
+
+std::list<std::string> cWorld::GetUsernames()
+{
+	std::list<std::string> usernames;
+	cCSLock Lock(m_CSPlayers);
+	for (cPlayerList::iterator itr = m_Players.begin(); itr != m_Players.end(); ++itr)
+	{
+		std::string username = (*itr)->GetName();
+		usernames.insert(usernames.begin(),username);
+	}
+	return usernames;
+}