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This diff is rather large, but it's just simply removing unnecessary headers
, remove some lint-style comments, add missing void to functions without args,
also some function prototypes (extern) were missing their args, so I added them
as they were defined in hack.h

OK tb@ on separate diffs

/*	$OpenBSD: hack.mkmaze.c,v 1.6 2016/01/09 18:33:15 mestre Exp $	*/

/*
 * Copyright (c) 1985, Stichting Centrum voor Wiskunde en Informatica,
 * Amsterdam
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * - 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.
 *
 * - Neither the name of the Stichting Centrum voor Wiskunde en
 * Informatica, 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER
 * 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.
 */

/*
 * Copyright (c) 1982 Jay Fenlason <hack@gnu.org>
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``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 AUTHOR 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 "hack.h"

extern struct permonst pm_wizard;
struct permonst hell_hound =
	{ "hell hound", 'd', 12, 14, 2, 3, 6, 0 };

static void walkfrom(int, int);
static void move(int *, int *, int);
static int  okay(int, int, int);


void
makemaz(void)
{
	int x,y;
	int zx,zy;
	coord mm;
	boolean al = (dlevel >= 30 && !flags.made_amulet);

	for(x = 2; x < COLNO-1; x++)
		for(y = 2; y < ROWNO-1; y++)
			levl[x][y].typ = (x%2 && y%2) ? 0 : HWALL;
	if(al) {
	    struct monst *mtmp;

	    zx = 2*(COLNO/4) - 1;
	    zy = 2*(ROWNO/4) - 1;
	    for(x = zx-2; x < zx+4; x++) for(y = zy-2; y <= zy+2; y++) {
		levl[x][y].typ =
		    (y == zy-2 || y == zy+2 || x == zx-2 || x == zx+3) ? POOL :
		    (y == zy-1 || y == zy+1 || x == zx-1 || x == zx+2) ? HWALL:
		    ROOM;
	    }
	    (void) mkobj_at(AMULET_SYM, zx, zy);
	    flags.made_amulet = 1;
	    walkfrom(zx+4, zy);
	    if ((mtmp = makemon(&hell_hound, zx, zy)))
		mtmp->msleep = 1;
	    if ((mtmp = makemon(PM_WIZARD, zx+1, zy))) {
		mtmp->msleep = 1;
		flags.no_of_wizards = 1;
	    }
	} else {
	    mm = mazexy();
	    zx = mm.x;
	    zy = mm.y;
	    walkfrom(zx,zy);
	    (void) mksobj_at(WAN_WISHING, zx, zy);
	    (void) mkobj_at(ROCK_SYM, zx, zy);	/* put a rock on top of it */
	}

	for(x = 2; x < COLNO-1; x++)
		for(y = 2; y < ROWNO-1; y++) {
			switch(levl[x][y].typ) {
			case HWALL:
				levl[x][y].scrsym = '-';
				break;
			case ROOM:
				levl[x][y].scrsym = '.';
				break;
			}
		}
	for(x = rn1(8,11); x; x--) {
		mm = mazexy();
		(void) mkobj_at(rn2(2) ? GEM_SYM : 0, mm.x, mm.y);
	}
	for(x = rn1(10,2); x; x--) {
		mm = mazexy();
		(void) mkobj_at(ROCK_SYM, mm.x, mm.y);
	}
	mm = mazexy();
	(void) makemon(PM_MINOTAUR, mm.x, mm.y);
	for(x = rn1(5,7); x; x--) {
		mm = mazexy();
		(void) makemon((struct permonst *) 0, mm.x, mm.y);
	}
	for(x = rn1(6,7); x; x--) {
		mm = mazexy();
		mkgold(0L,mm.x,mm.y);
	}
	for(x = rn1(6,7); x; x--)
		mktrap(0,1,(struct mkroom *) 0);
	mm = mazexy();
	levl[(int)(xupstair = mm.x)][(int)(yupstair = mm.y)].scrsym = '<';
	levl[(int)xupstair][(int)yupstair].typ = STAIRS;
	xdnstair = ydnstair = 0;
}

static void
walkfrom(int x, int y)
{
	int q,a,dir;
	int dirs[4];

	levl[x][y].typ = ROOM;
	while(1) {
		q = 0;
		for(a = 0; a < 4; a++)
			if(okay(x,y,a)) dirs[q++]= a;
		if(!q) return;
		dir = dirs[rn2(q)];
		move(&x,&y,dir);
		levl[x][y].typ = ROOM;
		move(&x,&y,dir);
		walkfrom(x,y);
	}
}

static void
move(int *x, int *y, int dir)
{
	switch(dir){
		case 0: --(*y); break;
		case 1: (*x)++; break;
		case 2: (*y)++; break;
		case 3: --(*x); break;
	}
}

static int
okay(int x, int y, int dir)
{
	move(&x,&y,dir);
	move(&x,&y,dir);
	if(x<3 || y<3 || x>COLNO-3 || y>ROWNO-3 || levl[x][y].typ != 0)
		return(0);
	else
		return(1);
}

coord
mazexy(void)
{
	coord mm;

	mm.x = 3 + 2*rn2(COLNO/2 - 2);
	mm.y = 3 + 2*rn2(ROWNO/2 - 2);
	return mm;
}