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annotate xrogue/chase.c @ 306:057c5114e244

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Super-Rogue: fix some out-of-range constants. Constants K_ARROW etc., for causes of death other than monsters, are in the 240-255 range. They were often passed to functions taking char, which is usually signed, making the values out of range. The function declarations have been changed to unsigned char, which is also the type used by the scoreboard code.
author John "Elwin" Edwards
date Sat, 17 Apr 2021 15:41:12 -0400
parents e52a8a7ad4c5
children
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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 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 Based on "Rogue: Exploring the Dungeons of Doom"
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13 Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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14 All rights reserved.
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15
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16 See the file LICENSE.TXT for full copyright and licensing information.
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17 */
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18
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19 #include <ctype.h>
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20 #include <curses.h>
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21 #include <limits.h>
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22 #include <stdlib.h>
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23 #include "rogue.h"
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24
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25 bool straight_shot(int ery, int erx, int eey, int eex, coord *shooting);
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26
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27 /*
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28 * Canblink checks if the monster can teleport (blink). If so, it will
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29 * try to blink the monster next to the player.
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30 */
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31
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32 bool
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33 can_blink(struct thing *tp)
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34 {
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35 register int y, x, index=9;
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36 coord tryp; /* To hold the coordinates for use in diag_ok */
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37 bool spots[9], found_one=FALSE;
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38
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39 /*
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40 * First, can the monster even blink? And if so, there is only a 50%
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41 * chance that it will do so. And it won't blink if it is running or
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42 * held.
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43 */
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44 if (off(*tp, CANBLINK) || (on(*tp, ISHELD)) ||
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45 on(*tp, ISFLEE) ||
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46 tp->t_action == A_FREEZE ||
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47 (rnd(12) < 6)) return(FALSE);
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48
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49
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50 /* Initialize the spots as illegal */
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51 do {
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52 spots[--index] = FALSE;
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53 } while (index > 0);
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54
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55 /* Find a suitable spot next to the player */
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56 for (y=hero.y-1; y<hero.y+2; y++)
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57 for (x=hero.x-1; x<hero.x+2; x++, index++) {
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58 /* Make sure x coordinate is in range and that we are
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59 * not at the player's position
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60 */
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61 if (x<0 || x >= cols || index == 4) continue;
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62
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63 /* Is it OK to move there? */
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64 if (step_ok(y, x, NOMONST, tp) &&
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65 (!isatrap(mvwinch(cw, y, x) & A_CHARTEXT) ||
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66 rnd(10) >= tp->t_stats.s_intel ||
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67 on(*tp, ISFLY))) {
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68 /* OK, we can go here. But don't go there if
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69 * monster can't get at player from there
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70 */
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71 tryp.y = y;
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72 tryp.x = x;
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73 if (diag_ok(&tryp, &hero, tp)) {
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74 spots[index] = TRUE;
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75 found_one = TRUE;
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76 }
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77 }
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78 }
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79
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80 /* If we found one, go to it */
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81 if (found_one) {
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82 unsigned char rch; /* What's really where the creatures moves to */
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83
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84 /* Find a legal spot */
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85 while (spots[index=rnd(9)] == FALSE) continue;
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86
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87 /* Get the coordinates */
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88 y = hero.y + (index/3) - 1;
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89 x = hero.x + (index % 3) - 1;
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90
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91 /* Move the monster from the old space */