42 HISTORY *head, *tail, *current;  variable
62 	current = 0;  in addcmd()
70 	if (current) {  in prevcmd()
71 		if (current->previous)	/* stay on first item */  in prevcmd()
72 			return (current = current->previous);  in prevcmd()
74 			return (current);  in prevcmd()
76 		return (current = tail);  in prevcmd()
86 	if (current) {  in nextcmd()
87 		if (current->next)	/* stay on first item */  in nextcmd()
88 			return (current = current->next);  in nextcmd()
90 			return (current);  in nextcmd()
100 	current = 0;  in resetcmd()
106 	return (current);  in currentcmd()