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annotate srogue/weapons.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 2128c7dc8a40
children 94a0d9dd5ce1
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36
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1 /*
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2 * Functions for dealing with weapons
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3 *
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4 * @(#)weapons.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 <ctype.h>
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18 #include "rogue.h"
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19 #include "rogue.ext"
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20
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21 /*
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22 * missile:
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23 * Fire a missile in a given direction
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24 */
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25 missile(ydelta, xdelta)
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26 int ydelta, xdelta;
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27 {
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28 reg struct object *obj, *nowwield;
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29 reg struct linked_list *item, *nitem;
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30
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31 /*
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32 * Get which thing we are hurling
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33 */
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34 nowwield = cur_weapon; /* must save current weap */
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35 if ((item = get_item("throw", WEAPON)) == NULL)
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36 return;
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37 obj = OBJPTR(item);
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38 if (!dropcheck(obj) || is_current(obj))
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39 return;
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40 if (obj == nowwield || obj->o_type != WEAPON) {
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41 reg int c;
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42
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43 msg("Do you want to throw that %s? (y or n)",obj->o_typname);
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44 do {
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45 c = readchar();
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46 if (isupper(c))
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47 c = tolower(c);
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48 if (c == ESCAPE || c == 'n') {
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49 msg("");
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50 cur_weapon = nowwield;
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51 after = FALSE; /* ooops, a mistake */
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52 return;
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53 }
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54 } while (c != 'y'); /* keep looking for good ans */
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55 }
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56 /*
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57 * Get rid of the thing. If it is a non-multiple item object, or
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58 * if it is the last thing, just drop it. Otherwise, create a new
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59 * item with a count of one.
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60 */
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61 if (obj->o_count < 2) {
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62 detach(pack, item);
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63 }
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64 else {
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65 obj->o_count--;
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66 obj->o_vol = itemvol(obj);
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67 nitem = new_item(sizeof *obj);
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68 obj = OBJPTR(nitem);
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69 *obj = *(OBJPTR(item));
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70 obj->o_count = 1;
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71 obj->o_vol = itemvol(obj);
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72 item = nitem;
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73 }
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74 updpack(); /* new pack weight */
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75 do_motion(obj, ydelta, xdelta);
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76 if (!isalpha(mvwinch(mw, obj->o_pos.y, obj->o_pos.x))
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77 || !hit_monster(&obj->o_pos, obj))
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78 fall(item, TRUE);
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79 mvwaddch(cw, hero.y, hero.x, PLAYER);
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80 }
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81
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82 /*
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83 * do the actual motion on the screen done by an object traveling
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84 * across the room
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85 */
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86 do_motion(obj, ydelta, xdelta)
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87 struct object *obj;
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88 int ydelta, xdelta;
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89 {
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90 reg int ch, y, x;
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91
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92 obj->o_pos = hero;
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93 while (1) {
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94 y = obj->o_pos.y;
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95 x = obj->o_pos.x;
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96 if (!ce(obj->o_pos, hero) && cansee(unc(obj->o_pos)) &&
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97 mvwinch(cw, y, x) != ' ')
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98 mvwaddch(cw, y, x, show(y, x));
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99 /*
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100 * Get the new position
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101 */
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102 obj->o_pos.y += ydelta;
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103 obj->o_pos.x += xdelta;
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104 y = obj->o_pos.y;
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105 x = obj->o_pos.x;