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annotate arogue7/passages.c @ 280:70aa5808c782

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Fix potential segfaults at restore related to ctime(). In some games, restore() passes the result of ctime() to mvprintw() or some other variadic message-formatting function. If ctime() has not been declared properly, its return type is inferred to be int instead of char *. This does not cause a warning because the compiler does not know the correct type of variadic arguments. On platforms where ints and pointers are not the same size, this can, probably depending on alignment, result in a segfault that is not easy to trace. Including time.h fixes the problem. Some games manually declared ctime() and avoided the bug. These declarations have also been replaced with the include.
author John "Elwin" Edwards
date Fri, 15 Sep 2017 20:51:10 -0400
parents f9ef86cf22b2
children e52a8a7ad4c5
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1 /*
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2 * passages.c - Draw the connecting passages
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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 /*
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16 * Draw the connecting passages
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17 *
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18 * @(#)passages.c 3.4 (Berkeley) 6/15/81
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19 */
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20
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21 #include <stdlib.h>
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22 #include "curses.h"
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23 #include "rogue.h"
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24
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25 void conn(int r1, int r2);
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26 void door(struct room *rm, coord *cp);
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27
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28 /*
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29 * do_passages:
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30 * Draw all the passages on a level.
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31 */
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32
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33 void
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34 do_passages(void)
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35 {
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36 register struct rdes *r1, *r2 = NULL;
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37 register int i, j;
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38 register int roomcount;
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39 static struct rdes
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40 {
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41 bool conn[MAXROOMS]; /* possible to connect to room i? */
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42 bool isconn[MAXROOMS]; /* connection been made to room i? */
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43 bool ingraph; /* this room in graph already? */
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44 } rdes[MAXROOMS] = {
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45 { { 0, 1, 0, 1, 0, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
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46 { { 1, 0, 1, 0, 1, 0, 0, 0, 0 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
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47 { { 0, 1, 0, 0, 0, 1, 0, 0, 0 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
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48 { { 1, 0, 0, 0, 1, 0, 1, 0, 0 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
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49 { { 0, 1, 0, 1, 0, 1, 0, 1, 0 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
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50 { { 0, 0, 1, 0, 1, 0, 0, 0, 1 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
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51 { { 0, 0, 0, 1, 0, 0, 0, 1, 0 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
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52 { { 0, 0, 0, 0, 1, 0, 1, 0, 1 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
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53 { { 0, 0, 0, 0, 0, 1, 0, 1, 0 }, { 0, 0, 0, 0, 0, 0, 0, 0, 0 }, 0 },
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54 };
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55
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56 /*
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57 * reinitialize room graph description
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58 */
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59 for (r1 = rdes; r1 <= &rdes[MAXROOMS-1]; r1++)
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60 {
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61 for (j = 0; j < MAXROOMS; j++)
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62 r1->isconn[j] = FALSE;
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63 r1->ingraph = FALSE;
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64 }
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65
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66 /*
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67 * starting with one room, connect it to a random adjacent room and
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68 * then pick a new room to start with.
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69 */
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70 roomcount = 1;
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71 r1 = &rdes[rnd(MAXROOMS)];
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72 r1->ingraph = TRUE;
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73 do
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74 {
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75 /*
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76 * find a room to connect with
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77 */
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78 j = 0;
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79 for (i = 0; i < MAXROOMS; i++)
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80 if (r1->conn[i] && !rdes[i].ingraph && rnd(++j) == 0)
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81 r2 = &rdes[i];
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82 /*
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83 * if no adjacent rooms are outside the graph, pick a new room
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84 * to look from
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85 */
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86 if (j == 0)
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87 {
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88 do
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