Failsafe for signs if entered over max line length

Minecraft.World/SignTileEntity.cpp

@@ -166,9 +166,13 @@ void SignTileEntity::setChanged()
 
 
 void SignTileEntity::SetMessage(int iIndex,wstring &wsText) 
-{ 
+{
+	if (wsText.length() > MAX_LINE_LENGTH)  // MAX_LINE_LENGTH == 15
+    {
+        wsText = wsText.substr(0, MAX_LINE_LENGTH);
+        OutputDebugStringW(L"Sign text truncated to 15 characters\n");
+    }
 	m_wsmessages[iIndex]=wsText;
-
 }
 
 // 4J-PB - added for string verification