-static int r_open(rset_control *ct, int wflag);
-static void r_close(rset_control *ct);
-static void r_delete(rset_control *ct);
-static void r_rewind(rset_control *ct);
-static int r_count(rset_control *ct);
-static int r_read();
-static int r_write();
+static int r_open (rset_control *ct, int wflag);
+static void r_close (rset_control *ct);
+static void r_delete (rset_control *ct);
+static void r_rewind (rset_control *ct);
+static int r_count (rset_control *ct);
+static int r_read (rset_control *ct, void *buf);
+static int r_write (rset_control *ct, const void *buf);