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annotate srogue/weapons.c @ 144:708bb2dea17c

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arogue7, xrogue: prevent potential NULL dereferencing. It is possible for getpwuid() to fail and return NULL. Various md_get* functions now check for this.
author John "Elwin" Edwards
date Mon, 18 May 2015 10:53:22 -0400
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;
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106 ch = winat(y, x);