wbkgrnd
extern int wbkgrnd(WINDOW *, const cchar_t *);
#define bkgrnd(b) wbkgrnd(stdscr,b)
wbkgrnd(stdscr, &cc);
wbkgrnd(w, &cc);
code = wbkgrnd(stdscr, bg);
extern int wbkgrnd(WINDOW *, const cchar_t *);
#define bkgrnd(b) wbkgrnd(stdscr, b)
(void) wbkgrnd(stdscr, &cc);
(void) wbkgrnd(w, &cc);
code = wbkgrnd(stdscr, bg);