Generating dates prior to generate_series

I'm using PostgreSQL version 7.3.2, and generate_series() is not
available, so this is a function to generate a series dates.

The function goes backwards if the second argument is less than the first
one. Check the two select statements at the end.

Best Regards,
Roger Tannous.

CREATE FUNCTION date_range(VARCHAR, VARCHAR) RETURNS SETOF DATE AS '

DECLARE

dateStart ALIAS FOR $1;

dateEnd ALIAS FOR $2;

forwardSteps BOOLEAN := true;

tmpDate DATE;

BEGIN

IF (to_date(dateStart, ''YYYY-mm-dd'') >
to_date(dateEnd, ''YYYY-mm-dd'')) THEN

forwardSteps := false;

END IF;

tmpDate := to_date(dateStart, ''YYYY-mm-dd'');

WHILE ((forwardSteps AND tmpDate <=
to_date(dateEnd, ''YYYY-mm-dd'')) OR (NOT forwardSteps AND tmpDate >=
to_date(dateEnd, ''YYYY-mm-dd''))) LOOP

RETURN NEXT tmpDate;

IF forwardSteps THEN

tmpDate := tmpDate +
interval ''1 day'';

ELSE

tmpDate := tmpDate -
interval ''1 day'';

END IF;

END LOOP;

RETURN;

END;

' LANGUAGE 'plpgsql';

select * FROM date_range('2007-01-03', '2007-03-20');

select * FROM date_range('2007-04-03', '2007-03-20');

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