xp = (struct xx *) malloc((unsigned) sizeof *xp);
xp = (struct xx *) malloc(sizeof *xp);
xxalloc(){	register struct xx *xp;	if (xxbufp > xxbufe)		abort();	if ((xp = xx_freelist) == 0)		/* XXX can't deal with failure */		xp = (struct xx *) malloc((unsigned) sizeof *xp);	else		xx_freelist = xp->link;	if (xx_head == 0)		xx_head = xp;	else		xx_tail->link = xp;	xx_tail = xp;	xp->link = 0;	return xp;}