Where is the char and varchar length in pg_catalog for function input variables

I have searched and searched and just cannot find the maximum lengths for
input variables in a function

i.e.

CREATE FUNCTION test(input1 char(5), input2 varchar(50))
RETURNS void AS
$$RAISE NOTICE('%,%'), $1, $2;$$
LANGUAGE plpgsql;

Where do I find the 5 and the 50 it has to be somewhere I have searched
through
pg_proc
pg_type
pg_attribute (whose attlen only relates to tables)
pg_type

and all possible manner of joining these tables.

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