vc-registered

vc-registered is a compiled Lisp function in `vc-hooks.el'.

(vc-registered FILE)

Return non-nil if FILE is registered in a version control system.

This function performs the check each time it is called. To rely
on the result of a previous call, use `vc-backend' instead. If the
file was previously registered under a certain backend, then that
backend is tried first.