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annotate rogue4/chase.c @ 162:600873555ec0

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Don't swap signal handlers in md_shellescape(). md_shellescape() sets SIGINT and SIGQUIT to be ignored, storing the previous handlers, and restores them after the shell exits. But it mixed up the two handlers. Since the signals were usually handled by the same function, this fix doesn't have much effect, but anything that makes signal code less confusing is a good thing.
author John "Elwin" Edwards
date Mon, 08 Jun 2015 10:01:25 -0400
parents 9535a08ddc39
children 1b73a8641b37
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12
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1 /*
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2 * Code for one creature to chase another
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3 *
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4 * @(#)chase.c 4.25 (Berkeley) 5/5/82
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5 *
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6 * Rogue: Exploring the Dungeons of Doom
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7 * Copyright (C) 1980, 1981, 1982 Michael Toy, Ken Arnold and Glenn Wichman
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8 * All rights reserved.
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9 *
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10 * See the file LICENSE.TXT for full copyright and licensing information.
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11 */
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12
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13 #include <curses.h>
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14 #include "rogue.h"
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15
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16 #define DRAGONSHOT 5 /* one chance in DRAGONSHOT that a dragon will flame */
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17
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18 coord ch_ret; /* Where chasing takes you */
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19
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20 /*
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21 * runners:
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22 * Make all the running monsters move.
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23 */
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24 runners()
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25 {
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26 register THING *tp;
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27 register THING *ntp;
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28
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29 for (tp = mlist; tp != NULL; tp = ntp)
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30 {
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31 ntp = next(tp);
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32 if (!on(*tp, ISHELD) && on(*tp, ISRUN))
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33 {
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34 if (!on(*tp, ISSLOW) || tp->t_turn)
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35 if (do_chase(tp) == -1)
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36 continue;
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37 if (on(*tp, ISHASTE))
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38 if (do_chase(tp) == -1)
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39 continue;
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40 tp->t_turn ^= TRUE;
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41 }
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42 }
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43 }
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44
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45 /*
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46 * do_chase:
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47 * Make one thing chase another.
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48 */
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49 do_chase(th)
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50 register THING *th;
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51 {
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52 register struct room *rer, *ree; /* room of chaser, room of chasee */
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53 register int mindist = 32767, i, dist;
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54 register bool stoprun = FALSE; /* TRUE means we are there */
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55 register char sch;
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56 register bool door;
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57 register THING *obj;
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58 register struct room *oroom;
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59 coord this; /* Temporary destination for chaser */
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60
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61 rer = th->t_room; /* Find room of chaser */
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62 if (on(*th, ISGREED) && rer->r_goldval == 0)
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63 th->t_dest = &hero; /* If gold has been taken, run after hero */
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64 if (th->t_dest == &hero) /* Find room of chasee */
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65 ree = proom;
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66 else
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67 ree = roomin(th->t_dest);
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68 /*
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69 * We don't count doors as inside rooms for this routine
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70 */
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71 door = (chat(th->t_pos.y, th->t_pos.x) == DOOR);
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72 /*
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73 * If the object of our desire is in a different room,
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74 * and we are not in a corridor, run to the door nearest to
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75 * our goal.
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76 */
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77 over:
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78 if (rer != ree)
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79 {
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80 for (i = 0; i < rer->r_nexits; i++) /* loop through doors */
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81 {
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82 dist = DISTANCE(th->t_dest->y, th->t_dest->x,
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83 rer->r_exit[i].y, rer->r_exit[i].x);
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84 if (dist < mindist)
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85 {
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86 this = rer->r_exit[i];
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87 mindist = dist;
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88 }
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89 }
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90 if (door)
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91 {
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92 rer = &passages[flat(th->t_pos.y, th->t_pos.x) & F_PNUM];
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93 door = FALSE;
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94 goto over;
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95 }
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96 }
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97 else
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98 {
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99 this = *th->t_dest;
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100 /*
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101 * For dragons check and see if (a) the hero is on a straight
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102 * line from it, and (b) that it is within shooting distance,
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103 * but outside of striking range.
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104 */
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105 if (th->t_type == 'D' && (th->t_pos.y == hero.y || th->t_pos.x == hero.x