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annotate xrogue/maze.c @ 298:5a94c9b3181e

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UltraRogue: clear the next_obj field when removing items from the floor. The next_obj field is a pointer which the top item in a stack uses to keep a list of the other items. When removing an item from the stack, rem_obj() failed to set next_obj to NULL, which can cause items in monster inventory to point to items earlier in the inventory list. That causes infinite co-recursion when saving or restoring.
author John "Elwin" Edwards
date Thu, 08 Feb 2018 20:54:34 -0500
parents f54901b9c39b
children 0250220d8cdd
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1 /*
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2 maze.c - functions for dealing with mazes
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3
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4 XRogue: Expeditions into the Dungeons of Doom
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5 Copyright (C) 1991 Robert Pietkivitch
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6 All rights reserved.
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7
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8 Based on "Advanced Rogue"
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9 Copyright (C) 1984, 1985 Michael Morgan, Ken Dalka and AT&T
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10 All rights reserved.
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11
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12 See the file LICENSE.TXT for full copyright and licensing information.
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13 */
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14
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15 #include <stdlib.h>
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16 #include <curses.h>
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17 #include "rogue.h"
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18
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19 struct cell {
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20 char y_pos;
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21 char x_pos;
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22 };
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23 struct b_cellscells {
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24 char num_pos; /* number of frontier cells next to you */
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25 struct cell conn[4]; /* the y,x position of above cell */
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26 } b_cells;
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27
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28 static char *maze_frontier, *maze_bits;
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29 static int maze_lines, maze_cols;
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30 static char *moffset(int y, int x);
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31 static char *foffset(int y, int x);
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32 static void rmwall(int newy, int newx, int oldy, int oldx);
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33 static void draw_maze(void);
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34 static int findcells(int y, int x);
133
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35
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36 /*
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37 * crankout:
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38 * Does actual drawing of maze to window
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39 */
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40
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41 static
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42 void
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43 crankout(void)
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44 {
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45 reg int x, y;
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46
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47 for (y = 0; y < lines - 3; y++) {
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48 move(y + 1, 0);
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49 for (x = 0; x < cols - 1; x++) {
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50 if (*moffset(y, x)) { /* here is a wall */
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51 if(y==0 || y==lines-4) /* top or bottom line */
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52 addch(HORZWALL);
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53 else if(x==0 || x==cols-2) /* left | right side */
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54 addch(VERTWALL);
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55 else if (y % 2 == 0 && x % 2 == 0) {
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56 if(*moffset(y, x-1) || *moffset(y, x+1))
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57 addch(HORZWALL);
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58 else
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59 addch(VERTWALL);
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60 }
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61 else if (y % 2 == 0)
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62 addch(HORZWALL);
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63 else
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64 addch(VERTWALL);
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65 }
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66 else
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67 addch(FLOOR);
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68 }
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69 }
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70 }
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71
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72 /*
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73 * domaze:
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74 * Draw the maze on this level.
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75 */
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76
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77 void
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78 do_maze(void)
133
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79 {
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80 reg int least;
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81 reg struct room *rp;
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82 reg struct linked_list *item;
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83 reg struct object *obj;
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84 int cnt;
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85 bool treas;
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86 coord tp;
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87
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88 for (rp = rooms; rp < &rooms[MAXROOMS]; rp++) {
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89 rp->r_flags = ISGONE; /* kill all rooms */
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90 rp->r_fires = NULL; /* no fires */
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91 }
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92 rp = &rooms[0]; /* point to only room */