question about type

hi
another question about type, if i have a C function like this :

extern char *foo (__const char *__msgid1, __const char *__msgid2,
                  unsigned long int __n)

it is the lisp equivalent function :

(uffi:def-function ("foo" foo)
                    ((msgid1 (* :char))
		     (msgid2 (* :char))
		     (n :unsigned-long)
		   :returning (* :char))


or must i use ":cstring" type ? 

thanks



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(concatenate 'string "lam" (reverse "gro.ylimafxut@"))