 or she calls the <I>arg_print_errors</I>
function which in turn calls the <I>errorfn</I> routine of each
<I>arg_xxx</I> for each error that was previously reported. This is
where the error messages for the corresponding error codes are
printed. The <I>parent</I> pointer refers to the pertinent <I>arg_xxx</I>
structure, and <I>FILE* fp</I> designates the output stream onto
which the error messages should be printed. The <I>errorcode</I>
parameter contains the same value returned by the <I>scanfn</I> or
<I>c