Description

   If you specify bufdesc, the LBR routine returns the module header
   into the buffer. If you specify buflen, the routine also returns
   the buffer's length. If you specify updatedesc, the routine
   updates the header information.

   You define the maximum length of the update information (by
   specifying a value for CRE$L_UHDMAX) when you create the library.
   The Librarian zero-fills the information if it is less than the
   maximum length or truncates it if it exceeds the maximum length.