46 typedef struct DirStructure DirStructure;  typedef
48 struct DirStructure  struct
50     DirStructure*       next;  argument
51     DirStructure*       prev;  argument
52     DirStructure*       child;  argument
53     DirStructure*       parent;  argument
57     DirStructure*       file;  argument
62     DirStructure*       nextInFst;  argument
63     DirStructure*       nextInDisc;                 // only valid for files  argument
64     DirStructure*       prevInDisc;                 // only valid for files  argument
73 DirStructure            DiskStart;  argument