obp/obp/dev/usb-devices/combined/parse.fth

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\ Hypervisor Software File: parse.fth
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id: @(#)parse.fth 1.3 00/04/04
purpose:
copyright: Copyright 1998-2000 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 =
;

: alt0?  ( addr -- ok? )  i-descript-alt-id c@ 0=  ;

: int-alt0?  ( addr -- this-one? )
   dup interface-descript?
   swap alt0?  and
;

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