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annotate srogue/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 * Code for one object to chase another
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3 *
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4 * @(#)chase.c 9.0 (rdk) 7/17/84
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5 *
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6 * Super-Rogue
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7 * Copyright (C) 1984 Robert D. Kindelberger
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8 * All rights reserved.
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9 *
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10 * Based on "Rogue: Exploring the Dungeons of Doom"
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11 * Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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12 * All rights reserved.
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13 *
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14 * See the file LICENSE.TXT for full copyright and licensing information.
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15 */
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16
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17 #include <stdlib.h>
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18 #include "rogue.h"
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19 #include "rogue.ext"
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20
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21 #define FARAWAY 32767
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22 #define RDIST(a, b) (DISTANCE((a)->y, (a)->x, (b).y, (b).x))
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23
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24 int do_chase(struct linked_list *mon);
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25 int chase(struct thing *tp, struct coord *ee, bool runaway, bool dofight);
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26
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27 struct coord ch_ret; /* Where chasing takes you */
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28
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29 /*
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30 * runners:
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31 * Make all the running monsters move.
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32 */
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33 void
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34 runners(void)
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35 {
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36 reg struct thing *tp;
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37 reg struct linked_list *mon,*nextmon;
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38
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39 for (mon = mlist; mon != NULL; mon = nextmon) {
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40 tp = THINGPTR(mon);
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41 nextmon = next(mon);
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42 if (off(*tp, ISHELD) && on(*tp, ISRUN)) {
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43 if (tp->t_nomove > 0)
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44 if (--tp->t_nomove > 0)
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45 continue;
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46 if (on(*tp, ISHASTE))
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47 if (do_chase(mon) == -1)
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48 continue;
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49 if (off(*tp, ISSLOW) || tp->t_turn)
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50 if (do_chase(mon) == -1)
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51 continue;
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52 tp->t_turn ^= TRUE;
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53 }
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54 }
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55 }
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56
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57
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58 /*
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59 * do_chase:
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60 * Make one thing chase another.
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61 */
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62 int
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63 do_chase(struct linked_list *mon)
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64 {
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65 reg struct thing *th;
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66 reg struct room *rer, *ree, *rxx;
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67 reg int mindist, i, dist;
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68 struct stats *st;
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69 bool stoprun = FALSE, ondoor = FALSE, link = FALSE;
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70 char runaway, dofight, wound, sch, ch;
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71 struct coord this;
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72 struct trap *trp;
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73
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74 th = THINGPTR(mon);
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75 wound = th->t_flags & ISWOUND;
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76 if (wound)
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77 mindist = 0;
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78 else
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79 mindist = FARAWAY;
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80 runaway = wound;
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81 dofight = !runaway;
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82 rer = th->t_room;
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83 if (th->t_type == 'V') {
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84 if (rer != NULL && !rf_on(rer, ISDARK)) {
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85 /*
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86 * Vampires can't stand the light
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87 */
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88 if (cansee(th->t_pos.y, th->t_pos.x))
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89 msg("The vampire vaporizes into thin air !");
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90 killed(mon, FALSE);
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91 return(-1);
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92 }
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93 }
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94 ree = roomin(th->t_dest); /* room of chasee */
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95 this = *th->t_dest;
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96 /*
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97 * If the object of our desire is in a different
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98 * room, then run to the door nearest to our goal.
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99 */
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100 if (mvinch(th->t_pos.y, th->t_pos.x) == DOOR)
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101 ondoor = TRUE;
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102 rxx = NULL;
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103 if (rer != NULL || ree != NULL) {
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