The function should never be used; it's always used via its wrapper macro. To simplify, and reduce chances of confusion: remove the function, and implement the macro directly in terms of stpcpy(mempcpy(strnlen())). Update the documentation, and improve the example, which was rather confusing. Cc: "Serge E. Hallyn" <serge@hallyn.com> Cc: Iker Pedrosa <ipedrosa@redhat.com> Signed-off-by: Alejandro Colomar <alx@kernel.org>