view srogue/passages.c @ 310:827441d05b3e

Advanced Rogue family: fix some potential buffer overflows. Some code for determining the score file location assumed that PATH_MAX would be less than 1024, which cannot be guaranteed. Advanced Rogue 5 and 7, and XRogue, have had the buffers for the file name enlarged. UltraRogue never called the functions, so the code has been deleted instead.
author John "Elwin" Edwards
date Mon, 03 May 2021 19:05:37 -0400
parents 13b482bd9e66
children
line wrap: on
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/*
 * Draw the connecting passages
 *
 * @(#)passages.c	9.0	(rdk)	 7/17/84
 *
 * Super-Rogue
 * Copyright (C) 1984 Robert D. Kindelberger
 * All rights reserved.
 *
 * Based on "Rogue: Exploring the Dungeons of Doom"
 * Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
 * All rights reserved.
 *
 * See the file LICENSE.TXT for full copyright and licensing information.
 */

#include <stdlib.h>
#include "rogue.h"
#include "rogue.ext"

void conn(int r1, int r2);
void door(struct room *rm, struct coord *cp);

/*
 * do_passages:
 *	Draw all the passages on a level.
 */

void
do_passages(void)
{
	reg struct rdes *r1, *r2 = NULL;
	reg int i, j;
	reg int roomcount;
	static struct rdes {
		bool conn[MAXROOMS];		/* possible to connect to room i */
		bool isconn[MAXROOMS];		/* connection was made to room i */
		bool	ingraph;			/* this room in graph already? */
	} rdes[MAXROOMS] = {
		{{ 0, 1, 0, 1, 0, 0, 0, 0, 0 },{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
		{{ 1, 0, 1, 0, 1, 0, 0, 0, 0 },{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
		{{ 0, 1, 0, 0, 0, 1, 0, 0, 0 },{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
		{{ 1, 0, 0, 0, 1, 0, 1, 0, 0 },{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
		{{ 0, 1, 0, 1, 0, 1, 0, 1, 0 },{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
		{{ 0, 0, 1, 0, 1, 0, 0, 0, 1 },{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
		{{ 0, 0, 0, 1, 0, 0, 0, 1, 0 },{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
		{{ 0, 0, 0, 0, 1, 0, 1, 0, 1 },{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
		{{ 0, 0, 0, 0, 0, 1, 0, 1, 0 },{ 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
	};

	/*
	 * reinitialize room graph description
	 */
	for (r1 = rdes; r1 < &rdes[MAXROOMS]; r1++) {
		for (j = 0; j < MAXROOMS; j++)
			r1->isconn[j] = FALSE;
		r1->ingraph = FALSE;
	}

	/*
	 * starting with one room, connect it to a random adjacent room and
	 * then pick a new room to start with.
	 */
	roomcount = 1;
	r1 = &rdes[rnd(MAXROOMS)];
	r1->ingraph = TRUE;
	do {
		/*
		 * find a room to connect with
		 */
		j = 0;
		for (i = 0; i < MAXROOMS; i++)
			if (r1->conn[i] && !rdes[i].ingraph && rnd(++j) == 0)
				r2 = &rdes[i];
		/*
		 * if no adjacent rooms are outside the graph, pick a new room
		 * to look from
		 */
		if (j == 0) {
			do {
				r1 = &rdes[rnd(MAXROOMS)];
			} until (r1->ingraph);
		}
		/*
		 * otherwise, connect new room to the graph, and draw a tunnel
		 * to it
		 */
		else {
			r2->ingraph = TRUE;
			i = r1 - rdes;
			j = r2 - rdes;
			conn(i, j);
			r1->isconn[j] = TRUE;
			r2->isconn[i] = TRUE;
			roomcount++;
		}
	} while (roomcount < MAXROOMS);

	/*
	 * attempt to add passages to the graph a random number of times so
	 * that there isn't just one unique passage through it.
	 */
	for (roomcount = rnd(5); roomcount > 0; roomcount--) {
		r1 = &rdes[rnd(MAXROOMS)];	/* a random room to look from */
		/*
		 * find an adjacent room not already connected
		 */
		j = 0;
		for (i = 0; i < MAXROOMS; i++)
			if (r1->conn[i] && !r1->isconn[i] && rnd(++j) == 0)
				r2 = &rdes[i];
		/*
		 * if there is one, connect it and look for the next added
		 * passage
		 */
		if (j != 0) {
			i = r1 - rdes;
			j = r2 - rdes;
			conn(i, j);
			r1->isconn[j] = TRUE;
			r2->isconn[i] = TRUE;
		}
	}
}

/*
 * conn:
 *	Cconnect two rooms.
 */

void
conn(int r1, int r2)
{
	reg struct room *rpf, *rpt = NULL;
	reg signed char rmt, direc;
	reg int distance, turn_spot, turn_distance, rm;
	struct coord curr, turn_delta, spos, epos;

	if (r1 < r2) {
		rm = r1;
		if (r1 + 1 == r2)
			direc = 'r';
		else
			direc = 'd';
	}
	else {
		rm = r2;
		if (r2 + 1 == r1)
			direc = 'r';
		else
			direc = 'd';
	}
	rpf = &rooms[rm];
	/*
	 * Set up the movement variables, in two cases:
	 * first drawing one down.
	 */
	if (direc == 'd') {
		rmt = rm + 3;				/* room # of dest */
		rpt = &rooms[rmt];			/* room pointer of dest */
		delta.x = 0;				/* direction of move */
		delta.y = 1;
		spos.x = rpf->r_pos.x;			/* start of move */
		spos.y = rpf->r_pos.y;
		epos.x = rpt->r_pos.x;			/* end of move */
		epos.y = rpt->r_pos.y;
		if (!rf_on(rpf,ISGONE)) {		/* if not gone pick door pos */
			spos.x += rnd(rpf->r_max.x-2)+1;
			spos.y += rpf->r_max.y-1;
		}
		if (!rf_on(rpt,ISGONE))
			epos.x += rnd(rpt->r_max.x-2)+1;
		distance = abs(spos.y - epos.y) - 1;	/* distance to move */
		turn_delta.y = 0;						/* direction to turn */
		turn_delta.x = (spos.x < epos.x ? 1 : -1);
		turn_distance = abs(spos.x - epos.x);	/* how far to turn */
		turn_spot = rnd(distance-1) + 1;		/* where turn starts */
	}
	else if (direc == 'r') {		/* setup for moving right */
		rmt = rm + 1;
		rpt = &rooms[rmt];
		delta.x = 1;
		delta.y = 0;
		spos.x = rpf->r_pos.x;
		spos.y = rpf->r_pos.y;
		epos.x = rpt->r_pos.x;
		epos.y = rpt->r_pos.y;
		if (!rf_on(rpf,ISGONE)) {
			spos.x += rpf->r_max.x-1;
			spos.y += rnd(rpf->r_max.y-2)+1;
		}
		if (!rf_on(rpt,ISGONE))
			epos.y += rnd(rpt->r_max.y-2)+1;
		distance = abs(spos.x - epos.x) - 1;
		turn_delta.y = (spos.y < epos.y ? 1 : -1);
		turn_delta.x = 0;
		turn_distance = abs(spos.y - epos.y);
		turn_spot = rnd(distance-1) + 1;
	}
	else {
		msg("Error in connection tables.");
		return;
	}
	/*
	 * Draw in the doors on either side of the passage
	 * or just put #'s if the rooms are gone. Set up
	 * pointers to the connected room.
	 */
	rpf->r_ptr[rpf->r_nexits] = rpt;
	if (rf_on(rpf,ISGONE)) {
		cmov(spos);
		addch('#');		/* gone "from" room */
	}
	else
		door(rpf, &spos);	/* add the door */
	rpt->r_ptr[rpt->r_nexits] = rpf;
	if (rf_on(rpt,ISGONE)) {
		cmov(epos);
		addch('#');		/* gone "to" room */
	}
	else
		door(rpt, &epos);	/* add door */
	/*
	 * Get ready to move...
	 */
	curr.x = spos.x;
	curr.y = spos.y;
	while(distance > 0) {
		/*
		 * Move to new position
		 */
		curr.x += delta.x;
		curr.y += delta.y;
		/*
		 * Check if we are at the turn place, if so do the turn
		 */
		if (distance == turn_spot && turn_distance > 0) {
			while(turn_distance-- > 0) {
				cmov(curr);
				addch(PASSAGE);
				curr.x += turn_delta.x;
				curr.y += turn_delta.y;
			}
		}
		/*
		 * Continue digging along
		 */
		cmov(curr);
		addch(PASSAGE);
		distance--;
	}
	curr.x += delta.x;
	curr.y += delta.y;
	if (!ce(curr, epos)) {
		msg("Warning, connectivity problem on this level.");
	}
}

/*
 * Add a door or possibly a secret door
 * also enters the door in the exits array of the room.
 */

void
door(struct room *rm, struct coord *cp)
{
	cmov(*cp);
	addch(rnd(10) < level - 1 && rnd(100) < 20 ? SECRETDOOR : DOOR);
	rm->r_exit[rm->r_nexits++] = *cp;
}


/*
 * add_pass:
 *	add the passages to the current window (wizard command)
 */
void
add_pass(void)
{
	reg int y, x, ch;

	for (y = 1; y < LINES - 3; y++)
		for (x = 0; x < COLS; x++)
			if ((ch = mvinch(y, x)) == PASSAGE || ch == DOOR ||
			  ch == SECRETDOOR)
				mvwaddch(cw, y, x, ch);
}