\ An extended string is essentially the same
\ as a counted string, with the only difference that
\ instead of storing max 1 char length of a string,
\ we can store up to cell sized strings.

\ Copy an extended string to 
: xplace ( c-addr u a-addr -- )
    swap dup >r over ! ( c-addr a-addr )
    cell + r> move ;
: xcount ( a-addr -- c-addr u )
    dup cell + swap @ ;
: +xplace ( c-addr u a-addr -- )
    2dup >r >r xcount ( c-addr u c-addr u )
    + swap ( c-addr a-addr u )
    move ( -- )
    r> r> +! ;

\ single char
create somechar 1 chars allot align
: +xplace-char ( n a-addr -- )
    swap somechar c! somechar 1 rot +xplace ;