#:make-null-pointer
#:+null-cstring-pointer+
#:char-array-to-pointer
+ #:with-cast-pointer
+ #:def-foreign-var
;; string functions
#:convert-from-cstring
#:convert-to-foreign-string
#:allocate-foreign-string
#:with-foreign-string
+ #:foreign-string-length
;; function call
#:def-function