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annotate arogue7/maze.c @ 144:708bb2dea17c

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arogue7, xrogue: prevent potential NULL dereferencing. It is possible for getpwuid() to fail and return NULL. Various md_get* functions now check for this.
author John "Elwin" Edwards
date Mon, 18 May 2015 10:53:22 -0400
parents adfa37e67084
children f9ef86cf22b2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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125
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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 * Advanced Rogue
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5 * Copyright (C) 1984, 1985, 1986 Michael Morgan, Ken Dalka and AT&T
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6 * All rights reserved.
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7 *
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8 * Based on "Rogue: Exploring the Dungeons of Doom"
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9 * Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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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 "curses.h"
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16 #include <stdlib.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 bordercells {
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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 } border_cells;
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27
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28
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29 static char *frontier,
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30 *bits;
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31 static int maze_lines,
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32 maze_cols;
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33 char *moffset(),
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34 *foffset();
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35
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36
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37 /*
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38 * crankout:
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39 * Does actual drawing of maze to window
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40 */
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41 crankout()
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42 {
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43 reg int x, y;
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44
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45 for (y = 0; y < lines - 3; y++) {
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46 move(y + 1, 0);
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47 for (x = 0; x < cols - 1; x++) {
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48 if (*moffset(y, x)) { /* here is a wall */
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49 if(y==0 || y==lines-4) /* top or bottom line */
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50 addch('-');
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51 else if(x==0 || x==cols-2) /* left | right side */
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52 addch('|');
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53 else if (y % 2 == 0 && x % 2 == 0) {
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54 if(*moffset(y, x-1) || *moffset(y, x+1))
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55 addch('-');
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56 else
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57 addch('|');
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58 }
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59 else if (y % 2 == 0)
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60 addch('-');
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61 else
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62 addch('|');
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63 }
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64 else
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65 addch(FLOOR);
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66 }
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67 }
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68 }
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69
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70 /*
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71 * domaze:
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72 * Draw the maze on this level.
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73 */
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74 do_maze()
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75 {
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76 reg int least;
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77 reg struct room *rp;
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78 reg struct linked_list *item;
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79 reg struct object *obj;
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80 int cnt;
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81 bool treas;
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82 coord tp;
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83
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84 for (rp = rooms; rp < &rooms[MAXROOMS]; rp++) {
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85 rp->r_flags = ISGONE; /* kill all rooms */
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86 rp->r_fires = NULL; /* no fires */
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87 }
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88 rp = &rooms[0]; /* point to only room */
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89 rp->r_flags = ISDARK; /* mazes always dark */
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90 rp->r_pos.x = 0; /* room fills whole screen */
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91 rp->r_pos.y = 1;
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92 rp->r_max.x = cols - 1;
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93 rp->r_max.y = lines - 3;
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