add_wch
extern int add_wch(const cchar_t *);
#define mvadd_wch(y,x,cp) (move(y,x)?ERR:add_wch(cp))
(add_wch)(cc)
extern int add_wch(const cchar_t *);
#define mvadd_wch(y, x, cp) (move(y, x) ? ((cp), ERR) : add_wch(cp))