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expand the internal consistency checks in truedirec() to avoid
fallthrough cases.  now if direction turns up wrong (it should
not, but this code can't tell that, and convert it to an enum
that would also fix this, is more effort than this is worth.

/*	$NetBSD: room.c,v 1.14 2019/10/05 23:34:14 mrg Exp $	*/

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)room.c	8.2 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: room.c,v 1.14 2019/10/05 23:34:14 mrg Exp $");
#endif
#endif				/* not lint */

#include "extern.h"

void
writedes(void)
{
	int     compass;
	const char   *p;
	int     c;

	printf("\n\t%s\n", location[position].name);
	if (beenthere[position] < ROOMDESC || verbose) {
		compass = NORTH;
		for (p = location[position].desc; (c = *p++) != 0;)
			if (c != '-' && c != '*' && c != '+') {
				if (c == '=')
					putchar('-');
				else
					putchar(c);
			} else {
				if (c != '*')
					printf("%s", truedirec(compass, c));
				compass++;
			}
	}
}

void
printobjs(void)
{
	unsigned int *p = location[position].objects;
	int     n;

	printf("\n");
	for (n = 0; n < NUMOFOBJECTS; n++)
		if (testbit(p, n) && objdes[n])
			puts(objdes[n]);
}

void
whichway(struct room here)
{
	switch (direction) {

	case NORTH:
		left = here.west;
		right = here.east;
		ahead = here.north;
		back = here.south;
		break;

	case SOUTH:
		left = here.east;
		right = here.west;
		ahead = here.south;
		back = here.north;
		break;

	case EAST:
		left = here.north;
		right = here.south;
		ahead = here.east;
		back = here.west;
		break;

	case WEST:
		left = here.south;
		right = here.north;
		ahead = here.west;
		back = here.east;
		break;

	}
}

const char *
truedirec(int way, int option)
{
	switch (way) {

	case NORTH:
		switch (direction) {
		case NORTH:
			return ("ahead");
		case SOUTH:
			return (option == '+' ? "behind you" :
			    "back");
		case EAST:
			return ("left");
		case WEST:
			return ("right");
		}
		break;

	case SOUTH:
		switch (direction) {
		case NORTH:
			return (option == '+' ? "behind you" :
			    "back");
		case SOUTH:
			return ("ahead");
		case EAST:
			return ("right");
		case WEST:
			return ("left");
		}
		break;

	case EAST:
		switch (direction) {
		case NORTH:
			return ("right");
		case SOUTH:
			return ("left");
		case EAST:
			return ("ahead");
		case WEST:
			return (option == '+' ? "behind you" :
			    "back");
		}
		break;

	case WEST:
		switch (direction) {
		case NORTH:
			return ("left");
		case SOUTH:
			return ("right");
		case EAST:
			return (option == '+' ? "behind you" :
			    "back");
		case WEST:
			return ("ahead");
		}
		break;
	}

	printf("Error: room %d.  More than four directions wanted.", 
	    position);
	return ("!!");
}

void
newway(int thisway)
{
	switch (direction) {

	case NORTH:
		switch (thisway) {
		case LEFT:
			direction = WEST;
			break;
		case RIGHT:
			direction = EAST;
			break;
		case BACK:
			direction = SOUTH;
			break;
		}
		break;
	case SOUTH:
		switch (thisway) {
		case LEFT:
			direction = EAST;
			break;
		case RIGHT:
			direction = WEST;
			break;
		case BACK:
			direction = NORTH;
			break;
		}
		break;
	case EAST:
		switch (thisway) {
		case LEFT:
			direction = NORTH;
			break;
		case RIGHT:
			direction = SOUTH;
			break;
		case BACK:
			direction = WEST;
			break;
		}
		break;
	case WEST:
		switch (thisway) {
		case LEFT:
			direction = SOUTH;
			break;
		case RIGHT:
			direction = NORTH;
			break;
		case BACK:
			direction = EAST;
			break;
		}
		break;
	}
}