I have this user-defined function in T-Sql that will return a business day date (excluding Sat/Sun) based on add or subtract days.
Need help on how to convert this to an Oracle function.

CREATE FUNCTION [dbo].[businessDaysAdd]
(
@bDays int , -- number of business days to add sub.
@d datetime -- variable to hold the date you want to add sub. days to)
)
RETURNS datetime
AS
BEGIN
-- Declare the return variable here
DECLARE @nDate datetime, @addsub int
SET @ndate = @d
IF @bdays > 0
SET @addsub = 1
ELSE
SET @addsub = -1
WHILE @bdays <> 0 -- Keep adding/subtracting a day until @bdays becomes 0
BEGIN
SELECT @ndate = dateadd(day,1*@addsub,@ndate)
SELECT @bdays =
CASE datepart(weekday,@ndate)-- ignore if it is Sat or Sunday
WHEN 7 THEN @bdays
WHEN 1 THEN @bdays
ELSE @bdays - 1*@addsub
END
END
RETURN @nDate
END