Array to rowset function

I have a function to convert a single dimension array to a row set

CREATE OR REPLACE FUNCTION arraytotable(anyarray)
RETURNS SETOF anyelement AS
'
DECLARE

theData ALIAS FOR $1;
count integer;
start integer;

BEGIN
start :=array_lower(theData,1);
count :=array_upper(theData,1);
IF start is not null THEN
FOR i IN start..count LOOP
RETURN NEXT theData[i];
END LOOP;
END IF;

RETURN;
END
'
LANGUAGE 'plpgsql' IMMUTABLE STRICT;

Is there a more efficient way I can do this and are there any user defined
C functions available for this sort of array manipulation?

Thanks for any help
Laurie

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