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Include only needed header files per each source file

OK tb@

/*	$OpenBSD: room.c,v 1.11 2015/12/31 17:51:19 mestre Exp $	*/
/*	$NetBSD: room.c,v 1.3 1995/03/21 15:07:54 cgd 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 <stdio.h>

#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, char 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");
		}

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

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

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

	default:
		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;
	}
}