event.c

struct event
event_getevent()
{
	for (;;)
		{
			errno = 0;
			int c = getch();


			switch (c)
				{
				case RET:
					return (struct event) { .tag = RET };
				case UP: // 'A'
				case DOWN: // 'B'
					return (struct event) { .tag = c };
					break;
				}
			return (struct event) { .tag = CHAR, .character = c };
		}
}

event.h

enum EVENT_TAG {
	NONE,
	UP = 72,
	DOWN = 80,
	RET = '\r',
	CHAR,
	RESIZE
};