is there a way to determine the attributes of anyelement

I have written a simple procedure that accepts anyarray, and concatinates the
elements separated by a space and returns the result to anyelement.

I know when I call this function I will always be passing varchars. If the
length of the resultant concatination
is longer than the maximum length of the return varchar I want to truncate
at the max. Since I don't know the max length of the return varchar I now
get an error in this situation:
ERROR: value too long for type character varying(10)

is there a way to determine the maximum length of the varchar of anyelement
inside the function?

Here is my simple function:

create or replace function concat_arr( p_array anyarray
) returns anyelement as \$\$
DECLARE
out_char ALIAS FOR \$0;
BEGIN
out_char := '' ;
FOR i IN 1..array_upper(p_array, 1) LOOP
if i <> 1 then
out_char := out_char || ' ' || p_array[i] ;
else
out_char := out_char || p_array[i] ;
end if ;
END LOOP;
return (out_char) ;
END;

\$\$ LANGUAGE plpgsql
;

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