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\ Hypervisor Software File: io.fth
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id: @(#)io.fth 1.1 06/02/16 
purpose: 
copyright: Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
copyright: Use is subject to license terms.

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h# 60 constant cons-getchar-fun
h# 61 constant cons-putchar-fun

h# 80 constant fast-trap

: (hyperkey) ( -- char error? ) 0 2 cons-getchar-fun fast-trap htrap ;

: hyperemit ( char -- )
   begin
      dup 1 1 cons-putchar-fun fast-trap htrap
      while 1 ms
   repeat drop
;

0 value hyperbreak?

: hyper-maygetchar ( -- char true | false )
   (hyperkey)  if		( ?? )
      drop false		( false )
   else				( char|break )
      dup -1 =  if		( break )
         \ BREAK
         to hyperbreak? false	( false )
      else			( char )
         true			( char true )
      then			( char true | false )
   then				( char true | false )
;

variable hyper-keybuf

headers

: hyperkey? ( -- flag )
   hyper-keybuf @ -1 =  if	(  )
      hyper-maygetchar  if	( char )
         hyper-keybuf !  true   ( flag )
      else			(  )
         false			( flag )
      then			( flag )
   else				(  )
       true			( flag )
   then				( flag )
;

: hyperkey ( -- char )
   begin  hyperkey?  until  hyper-keybuf @  -1 hyper-keybuf !
;

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