s" testfile.txt" Value testfile

256 Constant max-line
Create line-buffer max-line 2 + allot


0 Value fd-in
0 Value fd-out
: open-input ( addr u -- )
    r/o open-file throw to fd-in ;
: open-output ( addr u -- )
    w/o create-file throw to fd-out ;

: close-input ( -- )
    fd-in close-file throw ;
: close-output ( -- )
    fd-out close-file throw ;


: read-some ( -- buf len )
    line-buffer max-line fd-in read-line throw drop
    line-buffer swap ;


: main
    testfile open-input read-some type close-input ;

main
main