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\ 
\ Hypervisor Software File: parse.fth
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\ ========== Copyright Header End ============================================
id: @(#)parse.fth 1.2 99/02/08
purpose: 
copyright: Copyright 1998 Sun Microsystems, Inc.  All Rights Reserved

: next-descriptor  ( addr1 -- next-addr )
   dup c@ +
;

: #remaining  ( addr1 addr2 cnt1 -- cnt2 )
   -rot swap - -
;

: interface-descript?  ( addr -- interface? )
   1+ c@  interface-descript =
;

: endpoint-descript?  ( addr -- endpoint? )
   1+ c@  endpoint-descript =
;

: my-alt0?  ( int# addr -- ok? )
   tuck i-descript-interface-id c@ =
   swap i-descript-alt-id c@ 0=
   and
;

: intn-alt0?  ( int# addr -- this-one? )
   dup interface-descript?
   -rot my-alt0?  and
;

\ loop through the descriptor as long as it is not interface n, alternative
\ setting 0.  When it is, return the start and remaining number of bytes in
\ the descriptor
: find-int-start  ( conf-adr ccnt intn -- intn-adr ccnt2 )
   -rot >r					( R: cnt )
   begin			( int# addr )  ( R: cnt )
      dup next-descriptor	( int# addr1 addr2 )
      tuck r> #remaining >r
      2dup intn-alt0?
   until
   nip r>
;

: next-endpoint-descriptor  ( addr --endp-descr )
   begin
      next-descriptor
      dup endpoint-descript?
   until
;

: find-ith-endpoint-start  ( int-descr i -- endp-descr )
   1+ 0 do  next-endpoint-descriptor  loop
;