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annotate arogue5/monsters.c @ 83:09db0cf536af

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Properly handle invalid room references in savefiles. In all games, rs_write_room_reference() stored -1 for a nonexistent room, but rs_read_room_reference() did not check for out-of-bounds values, leading to pointers to rooms[-1], which sometimes caused crashes. rs_read_room_reference() has now been modified to use NULL instead. Some of the games required further changes to replace NULL with the pointer to the actual room. Others are capable of handling NULL for objects not in any room.
author John "Elwin" Edwards
date Thu, 08 Aug 2013 12:41:35 -0700
parents 0ed67132cf10
children 56e748983fa8
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0ed67132cf10 Import Advanced Rogue 5.8 from the Roguelike Restoration Project (r1490)
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1 /*
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2 * File with various monster functions in it
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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 "curses.h"
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16 #include "rogue.h"
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17 #include <ctype.h>
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18 #include <string.h>
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19
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20
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21 /*
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22 * Check_residue takes care of any effect of the monster
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23 */
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24 check_residue(tp)
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25 register struct thing *tp;
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26 {
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27 /*
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28 * Take care of special abilities
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29 */
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30 if (on(*tp, DIDHOLD) && (--hold_count == 0)) turn_off(player, ISHELD);
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31
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32 /* If it has lowered player, give him back a level */
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33 if (on(*tp, DIDDRAIN)) raise_level(FALSE);
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34
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35 /* If frightened of this monster, stop */
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36 if (on(player, ISFLEE) &&
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37 player.t_dest == &tp->t_pos) turn_off(player, ISFLEE);
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38
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39 /* If monster was suffocating player, stop it */
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40 if (on(*tp, DIDSUFFOCATE)) extinguish(suffocate);
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41
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42 /* If something with fire, may darken */
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43 if (on(*tp, HASFIRE)) {
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44 register struct room *rp=roomin(&tp->t_pos);
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45 register struct linked_list *fire_item;
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46
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47 if (rp) {
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48 for (fire_item = rp->r_fires; fire_item != NULL;
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49 fire_item = next(fire_item)) {
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50 if (THINGPTR(fire_item) == tp) {
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51 detach(rp->r_fires, fire_item);
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52 destroy_item(fire_item);
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53 if (rp->r_fires == NULL) {
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54 rp->r_flags &= ~HASFIRE;
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55 if (cansee(tp->t_pos.y, tp->t_pos.x)) light(&hero);
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56 }
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57 break;
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58 }
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59 }
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60 }
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61 }
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62 }
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63
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64 /*
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65 * Creat_mons creates the specified monster -- any if 0
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66 */
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67
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68 bool
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69 creat_mons(person, monster, report)
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70 struct thing *person; /* Where to create next to */
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71 short monster;
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72 bool report;
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73 {
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74 struct linked_list *nitem;
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75 register struct thing *tp;
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76 struct room *rp;
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77 coord *mp;
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78
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79 if (levtype == POSTLEV)
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80 return(FALSE);
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81 if ((mp = fallpos(&(person->t_pos), FALSE, 2)) != NULL) {
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82 nitem = new_item(sizeof (struct thing));
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83 new_monster(nitem,
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84 monster == 0 ? randmonster(FALSE, FALSE)
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85 : monster,
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86 mp,
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87 TRUE);
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88 tp = THINGPTR(nitem);
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89 runto(tp, &hero);
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90 tp->t_no_move = 1; /* since it just got here, it is disoriented */
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91 carry_obj(tp, monsters[tp->t_index].m_carry/2); /* only half chance */
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92 if (on(*tp, HASFIRE)) {
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93 rp = roomin(&tp->t_pos);
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94 if (rp) {
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95 register struct linked_list *fire_item;
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96
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97 /* Put the new fellow in the room list */
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98 fire_item = creat_item();
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99 ldata(fire_item) = (char *) tp;
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100 attach(rp->r_fires, fire_item);
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101
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102 rp->r_flags |= HASFIRE;
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103 }
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