-int bcmp __P((const char *, const char *, size_t));
-void bcopy __P((const char *, char *, size_t));
-void bzero __P((char *, size_t));
+int bcmp __P((const void *, const void *, size_t));
+void bcopy __P((const void *, void *, size_t));
+void bzero __P((void *, size_t));