find-lisp-find-files-internal

find-lisp-find-files-internal is a compiled Lisp function in `find-lisp.el'.

(find-lisp-find-files-internal DIRECTORY FILE-PREDICATE DIRECTORY-PREDICATE)

Find files under DIRECTORY which satisfy FILE-PREDICATE.
FILE-PREDICATE is a function which takes two arguments: the file and its
directory.

DIRECTORY-PREDICATE is used to decide whether to descend into directories.
It is a function which takes two arguments, the directory and its parent.