lpad('abc', $sysmis) => ""
lpad('abc', -1, '*') => ""
lpad('abc', 0, '*') => "abc"
lpad('abc', 2, '*') => "abc"
lpad('abc', 3, '*') => "abc"
lpad('abc', 10, '*') => "*******abc"
lpad('abc', $sysmis) => ""
lpad('abc', -1, '*') => ""
lpad('abc', 0, '*') => "abc"
lpad('abc', 2, '*') => "abc"
lpad('abc', 3, '*') => "abc"
lpad('abc', 10, '*') => "*******abc"