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Fixes from OpenBSD.
   - If a player goes bankrupt buying a property (which shouldn't be
allowed, but I guess it is), don't cause them to resign to themselves.
   - Use "NULL", not "0", for pointers.
   - Avoid undefined behavior adjusting the current player after resigning.
   - Don't leak the memory used to store player names.

The last of these is disabled for the moment because we have the pointers
in question tagged const. Will see to this when I'm finished merging.

/*	$NetBSD: trade.c,v 1.13 2008/02/23 22:28:46 dholland Exp $	*/

/*
 * Copyright (c) 1980, 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[] = "@(#)trade.c	8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: trade.c,v 1.13 2008/02/23 22:28:46 dholland Exp $");
#endif
#endif /* not lint */

#include "monop.ext"

struct trd_st {			/* how much to give to other player	*/
	int	trader;			/* trader number		*/
	int	cash;			/* amount of cash 		*/
	int	gojf;			/* # get-out-of-jail-free cards	*/
	OWN	*prop_list;		/* property list		*/
};

typedef	struct trd_st	TRADE;

static const char	*plist[MAX_PRP+2];

static int	used[MAX_PRP];

static TRADE	trades[2];

static void get_list(int, int );
static int set_list(OWN *);
static void summate(void);
static void do_trade(void);
static void move_em(TRADE *, TRADE *);

void
trade()
{
	int tradee, i;

	trading = TRUE;
	for (i = 0; i < 2; i++) {
		trades[i].cash = 0;
		trades[i].gojf = FALSE;
		trades[i].prop_list = NULL;
	}
over:
	if (num_play == 1) {
		printf("There ain't no-one around to trade WITH!!\n");
		return;
	}
	if (num_play > 2) {
		tradee = getinp("Which player do you wish to trade with? ",
		    name_list);
		if (tradee == num_play)
			return;
		if (tradee == player) {
			printf("You can't trade with yourself!\n");
			goto over;
		}
	}
	else
		tradee = 1 - player;
	get_list(0, player);
	get_list(1, tradee);
	if (getyn("Do you wish a summary? ") == 0)
		summate();
	if (getyn("Is the trade ok? ") == 0)
		do_trade();
}

/*
 *	This routine gets the list of things to be trader for the
 * player, and puts in the structure given.
 */
static void
get_list(struct_no, play_no)
	int struct_no, play_no;
{
	int sn, pn;
	PLAY *pp;
	int numin, propnum, num_prp;
	OWN *op;
	TRADE *tp;

	for (numin = 0; numin < MAX_PRP; numin++)
		used[numin] = FALSE;
	sn = struct_no, pn = play_no;
	pp = &play[pn];
	tp = &trades[sn];
	tp->trader = pn;
	printf("player %s (%d):\n", pp->name, pn+1);
	if (pp->own_list) {
		numin = set_list(pp->own_list);
		for (num_prp = numin; num_prp; ) {
			propnum=getinp("Which property do you wish to trade? ",
			    plist);
			if (propnum == numin)
				break;
			else if (used[propnum])
				printf("You've already allocated that.\n");
			else {
				num_prp--;
				used[propnum] = TRUE;
				for (op = pp->own_list; propnum--; op = op->next)
					continue;
				add_list(pn, &(tp->prop_list), sqnum(op->sqr));
			}
		}
	}
	if (pp->money > 0) {
		printf("You have $%d.  ", pp->money);
		tp->cash = get_int("How much are you trading? ");
	}
	if (pp->num_gojf > 0) {
once_more:
		printf("You have %d get-out-of-jail-free cards. ",pp->num_gojf);
		tp->gojf = get_int("How many are you trading? ");
		if (tp->gojf > pp->num_gojf) {
			printf("You don't have that many.  Try again.\n");
			goto once_more;
		}
	}
}

/*
 *	This routine sets up the list of tradable property.
 */
static int
set_list(the_list)
	OWN *the_list;
{
	int i;
	OWN *op;

	i = 0;
	for (op = the_list; op; op = op->next)
		if (!used[i])
			plist[i++] = op->sqr->name;
	plist[i++] = "done";
	plist[i--] = 0;
	return i;
}

/*
 *	This routine summates the trade.
 */
static void
summate()
{
	bool some;
	int i;
	TRADE *tp;
	OWN *op;

	for (i = 0; i < 2; i++) {
		tp = &trades[i];
		some = FALSE;
		printf("Player %s (%d) gives:\n", play[tp->trader].name,
			tp->trader+1);
		if (tp->cash > 0)
			printf("\t$%d\n", tp->cash), some++;
		if (tp->gojf > 0)
			printf("\t%d get-out-of-jail-free card(s)\n", tp->gojf),
			some++;
		if (tp->prop_list) {
			for (op = tp->prop_list; op; op = op->next)
				putchar('\t'), printsq(sqnum(op->sqr), TRUE);
			some++;
		}
		if (!some)
			printf("\t-- Nothing --\n");
	}
}

/*
 *	This routine actually executes the trade.
 */
static void
do_trade()
{
	move_em(&trades[0], &trades[1]);
	move_em(&trades[1], &trades[0]);
}

/*
 *	This routine does a switch from one player to another
 */
static void
move_em(from, to)
	TRADE *from, *to;
{
	PLAY *pl_fr, *pl_to;
	OWN *op;

	pl_fr = &play[from->trader];
	pl_to = &play[to->trader];

	pl_fr->money -= from->cash;
	pl_to->money += from->cash;
	pl_fr->num_gojf -= from->gojf;
	pl_to->num_gojf += from->gojf;
	for (op = from->prop_list; op; op = op->next) {
		add_list(to->trader, &(pl_to->own_list), sqnum(op->sqr));
		op->sqr->owner = to->trader;
		del_list(from->trader, &(pl_fr->own_list), sqnum(op->sqr));
	}
	set_ownlist(to->trader);
}

/*
 *	This routine lets a player resign
 */
void
resign()
{
	int i, new_own;
	OWN *op;
	SQUARE *sqp;

	if (cur_p->money <= 0) {
		switch (board[cur_p->loc].type) {
		  case UTIL:
		  case RR:
		  case PRPTY:
			new_own = board[cur_p->loc].owner;
			/* If you ran out of money by buying current location */
			if (new_own == player)
				new_own = num_play;
			break;
		  default:		/* Chance, taxes, etc */
			new_own = num_play;
			break;
		}
		if (new_own == num_play)
			printf("You would resign to the bank\n");
		else
			printf("You would resign to %s\n", name_list[new_own]);
	}
	else if (num_play == 1) {
		new_own = num_play;
		printf("You would resign to the bank\n");
	}
	else {
		name_list[num_play] = "bank";
		do {
			new_own = getinp("Who do you wish to resign to? ",
			    name_list);
			if (new_own == player)
				printf("You can't resign to yourself!!\n");
		} while (new_own == player);
		name_list[num_play] = "done";
	}
	if (getyn("Do you really want to resign? ") != 0)
		return;
	if (num_play == 1) {
		printf("Then NOBODY wins (not even YOU!)\n");
		exit(0);
	}
	if (new_own < num_play) {	/* resign to player		*/
		printf("resigning to player\n");
		trades[0].trader = new_own;
		trades[0].cash = trades[0].gojf = 0;
		trades[0].prop_list = NULL;
		trades[1].trader = player;
		trades[1].cash = cur_p->money > 0 ? cur_p->money : 0;
		trades[1].gojf = cur_p->num_gojf;
		trades[1].prop_list = cur_p->own_list;
		do_trade();
	}
	else {				/* resign to bank		*/
		printf("resigning to bank\n");
		for (op = cur_p->own_list; op; op = op->next) {
			sqp = op->sqr;
			sqp->owner = -1;
			sqp->desc->morg = FALSE;
			if (sqp->type == PRPTY) {
				is_not_monop(sqp->desc->mon_desc);
				sqp->desc->houses = 0;
			}
		}
		if (cur_p->num_gojf)
			ret_card(cur_p);
	}
#if 0 /* notyet */
	free(name_list[player]);
#endif
	for (i = player; i < num_play; i++) {
		name_list[i] = name_list[i+1];
		if (i + 1 < num_play)
			play[i] = play[i+1];
	}
	name_list[num_play--] = NULL;
	for (i = 0; i < N_SQRS; i++)
		if (board[i].owner > player)
			--board[i].owner;
	player = player == 0 ? num_play - 1 : player - 1;
	next_play();
	if (num_play < 2) {
		printf("\nThen %s WINS!!!!!\n", play[0].name);
		printhold(0);
		printf("That's a grand worth of $%d.\n",
			play[0].money+prop_worth(&play[0]));
		exit(0);
	}
}