/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright (C) 1991 1992 1993 by John Chambers <jc@trillian.mit.edu>  *
* Permission  is granted to use this code for any purposes, as long as *
* the source is made available to users and this copyright  notice  is *
* preserved.  Feel free to make modifications as necessary, and to add *
* your own copyright notice  to  cover  your  changes.   If  you  make *
* improvements,  please  send  them  to  me  so  I can include them in *
* possible future versions.                                            *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */