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annotate srogue/chase.c @ 177:7bdac632ab9d

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srogue: fix an uninitialized variable. In wanderer(), if rp == hr, the loop could test ch before its value has been set. Initializing ch to '-' now causes the loop to repeat until a location is found.
author John "Elwin" Edwards
date Tue, 04 Aug 2015 11:39:49 -0400
parents 2128c7dc8a40
children 94a0d9dd5ce1
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36
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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 "rogue.h"
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18 #include "rogue.ext"
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19
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20 #define FARAWAY 32767
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21 #define RDIST(a, b) (DISTANCE((a)->y, (a)->x, (b).y, (b).x))
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22
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23 struct coord ch_ret; /* Where chasing takes you */
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24
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25 /*
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26 * runners:
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27 * Make all the running monsters move.
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28 */
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29 runners()
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30 {
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31 reg struct thing *tp;
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32 reg struct linked_list *mon,*nextmon;
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33
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34 for (mon = mlist; mon != NULL; mon = nextmon) {
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35 tp = THINGPTR(mon);
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36 nextmon = next(mon);
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37 if (off(*tp, ISHELD) && on(*tp, ISRUN)) {
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38 if (tp->t_nomove > 0)
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39 if (--tp->t_nomove > 0)
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40 continue;
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41 if (on(*tp, ISHASTE))
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42 if (do_chase(mon) == -1)
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43 continue;
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44 if (off(*tp, ISSLOW) || tp->t_turn)
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45 if (do_chase(mon) == -1)
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46 continue;
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47 tp->t_turn ^= TRUE;
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48 }
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49 }
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50 }
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51
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52
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53 /*
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54 * do_chase:
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55 * Make one thing chase another.
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56 */
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57 do_chase(mon)
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58 struct linked_list *mon;
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59 {
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60 reg struct thing *th;
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61 reg struct room *rer, *ree, *rxx;
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62 reg int mindist, i, dist;
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63 struct stats *st;
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64 bool stoprun = FALSE, ondoor = FALSE, link = FALSE;
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65 char runaway, dofight, wound, sch, ch;
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66 struct coord this;
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67 struct trap *trp;
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68
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69 th = THINGPTR(mon);
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70 wound = th->t_flags & ISWOUND;
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71 if (wound)
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72 mindist = 0;
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73 else
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74 mindist = FARAWAY;
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75 runaway = wound;
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76 dofight = !runaway;
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77 rer = th->t_room;
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78 if (th->t_type == 'V') {
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79 if (rer != NULL && !rf_on(rer, ISDARK)) {
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80 /*
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81 * Vampires can't stand the light
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82 */
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83 if (cansee(th->t_pos.y, th->t_pos.x))
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84 msg("The vampire vaporizes into thin air !");
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85 killed(mon, FALSE);
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86 return(-1);
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87 }
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88 }
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89 ree = roomin(th->t_dest); /* room of chasee */
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90 this = *th->t_dest;
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91 /*
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92 * If the object of our desire is in a different
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93 * room, then run to the door nearest to our goal.
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94 */
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95 if (mvinch(th->t_pos.y, th->t_pos.x) == DOOR)
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96 ondoor = TRUE;
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97 rxx = NULL;
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98 if (rer != NULL || ree != NULL) {
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99 /*
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100 * Monster not in room, hero in room. Run to closest door
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101 * in hero's room if not wounded. Run away if wounded.
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102 */
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103 if (rer == NULL && ree != NULL) {
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104 if (!wound)
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105 rxx = ree;
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106 }
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