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annotate arogue5/chase.c @ 233:0990adf580ee

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Declare some function arguments as const. Some functions, mostly in fight.c, declared variables as pointers to const char but passed them to functions that took pointers to ordinary char. The strings did not actually get modified, so adding 'const' to the function definitions removed the warnings.
author John "Elwin" Edwards
date Sun, 06 Mar 2016 19:32:47 -0500
parents 56e748983fa8
children e52a8a7ad4c5
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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 * Advanced Rogue
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5 * Copyright (C) 1984, 1985 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 #include <stdlib.h>
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16 #include <ctype.h>
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17 #include <limits.h>
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18 #include "curses.h"
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19 #include "rogue.h"
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20 #define MAXINT INT_MAX
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21 #define MININT INT_MIN
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22
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23 coord ch_ret; /* Where chasing takes you */
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24
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25 struct linked_list *get_hurl(struct thing *tp);
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26 bool straight_shot(int ery, int erx, int eey, int eex, coord *shooting);
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28
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29 /*
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30 * Canblink checks if the monster can teleport (blink). If so, it will
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31 * try to blink the monster next to the player.
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32 */
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33
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34 bool
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35 can_blink(struct thing *tp)
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36 {
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37 register int y, x, index=9;
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38 coord tryp; /* To hold the coordinates for use in diag_ok */
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39 bool spots[9], found_one=FALSE;
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40
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41 /*
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42 * First, can the monster even blink? And if so, there is only a 50%
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43 * chance that it will do so. And it won't blink if it is running or
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44 * held.
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45 */
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46 if (off(*tp, CANBLINK) || (on(*tp, ISHELD)) ||
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47 on(*tp, ISFLEE) ||
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48 (on(*tp, ISSLOW) && off(*tp, ISHASTE) && !(tp->t_turn)) ||
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49 tp->t_no_move ||
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50 (rnd(12) < 6)) return(FALSE);
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51
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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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91 y = hero.y + (index/3) - 1;
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92 x = hero.x + (index % 3) - 1;
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93
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94 /* Move the monster from the old space */
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95 mvwaddch(cw, tp->t_pos.y, tp->t_pos.x, tp->t_oldch);
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96
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97 /* Move it to the new space */
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98 tp->t_oldch = CCHAR( mvwinch(cw, y, x) );
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99
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100 /* Display the creature if our hero can see it */
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101 if (cansee(y, x) &&
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102 off(*tp, ISINWALL) &&
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103 !invisible(tp))