Made -cd useable with no image loaded

libisoburn/trunk/test/xorrisoburn.h

@@ -57,10 +57,12 @@ int Xorriso_rmi(struct XorrisO *xorriso, char *path, int flag);
 /* @param flag bit0= long format , bit1= only check for directory existence */
 int Xorriso_ls(struct XorrisO *xorriso, int flag);
 
-/* @param flag bit0= do not produce problem events (unless internal error) 
+/* @param eff_path  returns resulting effective path.
+                    Must provide at least SfileadrL bytes of storage.
+   @param flag bit0= do not produce problem events (unless faulty path format)
                bit1= work purely literally, do not use libisofs
-   @return <0 = internal error    , 0 = not found ,
-            1 = found simple node , 2 = found directory 
+   @return -1 = faulty path format, 0 = not found ,
+            1 = found simple node , 2 = found directory
 */
 int Xorriso_normalize_img_path(struct XorrisO *xorriso, char *img_path,
                                char eff_path[], int flag);