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annotate arogue7/chase.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 * chase.c - Code for one object to chase another
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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 * Code for one object to chase another
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17 *
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18 */
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19
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20 #include <ctype.h>
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21 #include <limits.h>
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22 #include <stdlib.h>
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23 #include "curses.h"
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24 #include "rogue.h"
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25 #define MAXINT INT_MAX
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26 #define MININT INT_MIN
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27
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28 bool straight_shot(int ery, int erx, int eey, int eex, coord *shooting);
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29
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30 /*
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31 * Canblink checks if the monster can teleport (blink). If so, it will
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32 * try to blink the monster next to the player.
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33 */
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34
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35 bool
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36 can_blink(struct thing *tp)
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37 {
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38 register int y, x, index=9;
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39 coord tryp; /* To hold the coordinates for use in diag_ok */
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40 bool spots[9], found_one=FALSE;
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41
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42 /*
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43 * First, can the monster even blink? And if so, there is only a 50%
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44 * chance that it will do so. And it won't blink if it is running or
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45 * held.
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46 */
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47 if (off(*tp, CANBLINK) || (on(*tp, ISHELD)) ||
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48 on(*tp, ISFLEE) ||
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49 tp->t_action == A_FREEZE ||
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50 (rnd(12) < 6)) return(FALSE);
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52
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53 /* Initialize the spots as illegal */
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54 do {
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55 spots[--index] = FALSE;
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56 } while (index > 0);
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57
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58 /* Find a suitable spot next to the player */
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59 for (y=hero.y-1; y<hero.y+2; y++)
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60 for (x=hero.x-1; x<hero.x+2; x++, index++) {
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61 /* Make sure x coordinate is in range and that we are
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62 * not at the player's position
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63 */
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64 if (x<0 || x >= cols || index == 4) continue;
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65
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66 /* Is it OK to move there? */
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67 if (step_ok(y, x, NOMONST, tp) &&
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68 (!isatrap(mvwinch(cw, y, x)) ||
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69 rnd(10) >= tp->t_stats.s_intel ||
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70 on(*tp, ISFLY))) {
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71 /* OK, we can go here. But don't go there if
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72 * monster can't get at player from there
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73 */
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74 tryp.y = y;
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75 tryp.x = x;
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76 if (diag_ok(&tryp, &hero, tp)) {
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77 spots[index] = TRUE;
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78 found_one = TRUE;
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79 }
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80 }
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81 }
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82
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83 /* If we found one, go to it */
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84 if (found_one) {
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85 char rch; /* What's really where the creatures moves to */
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86
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87 /* Find a legal spot */
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88 while (spots[index=rnd(9)] == FALSE) continue;
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89
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90 /* Get the coordinates */
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