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annotate arogue5/chase.c @ 81:0e212d46b68f

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rogue4: don't put savefile metadata into the savefile. The save_file() function in save.c stored the savefile's device number, inode number, creation time, and modification time in the file. The restore() function read them back, and apparently used to compare them to protect against cheaters. Unfortunately, the types and sizes of these numbers differ from system to system, which ruins the Roguelike Restoration Project's fine portability work. So they have been removed from the savefile. This BREAKS SAVEFILE COMPATIBILITY, but old files can be converted by excising the chunk starting at offset 0x22 with length sizeof(ino_t) + sizeof(dev_t) + 2 * sizeof(time_t). That's 0x14 on i686 and 0x20 on x86_64, at least with current versions of Linux and glibc.
author John "Elwin" Edwards
date Mon, 05 Aug 2013 20:49:41 -0700
parents 0ed67132cf10
children 56e748983fa8
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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 <ctype.h>
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16 #include <limits.h>
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17 #include "curses.h"
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18 #include "rogue.h"
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19 #define MAXINT INT_MAX
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20 #define MININT INT_MIN
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21
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22 coord ch_ret; /* Where chasing takes you */
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23
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24
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25
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26
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27
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28 /*
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29 * Canblink checks if the monster can teleport (blink). If so, it will
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30 * try to blink the monster next to the player.
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31 */
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32
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33 bool
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34 can_blink(tp)
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35 register 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))
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104 mvwaddch(cw, y, x, tp->t_type);
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