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annotate xrogue/encumb.c @ 314:2f0eb38da609

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Advanced Rogue 7: fix a crash when casting magic missile. do_zap() dereferenced a struct object pointer while ignoring the result of a NULL check. XRogue had the same problem, though triggering it was unlikely, since XRogue does not include a magic missile spell. Reported by John Harris of @Play.
author John "Elwin" Edwards
date Thu, 21 Oct 2021 21:00:15 -0400
parents e52a8a7ad4c5
children
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1 /*
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2 encumb.c - Stuff to do with encumberance
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3
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4 XRogue: Expeditions into the Dungeons of Doom
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5 Copyright (C) 1991 Robert Pietkivitch
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6 All rights reserved.
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7
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8 Based on "Advanced Rogue"
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9 Copyright (C) 1984, 1985 Michael Morgan, Ken Dalka and AT&T
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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
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18 int packweight(struct thing *tp);
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19
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20 /*
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21 * updpack:
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22 * Update his pack weight and adjust fooduse accordingly
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23 */
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24
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25 void
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26 updpack(int getmax, struct thing *tp)
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27 {
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28
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29 reg int topcarry, curcarry;
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30
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31 if (getmax)
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32 tp->t_stats.s_carry = totalenc(tp); /* get total encumb */
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33 curcarry = packweight(tp); /* get pack weight */
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34
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35 /* Only update food use for the player (for now) */
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36 if (tp == &player) {
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37 topcarry = tp->t_stats.s_carry / 5; /* 20% of total carry */
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38 if(curcarry > 4 * topcarry) {
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39 if(rnd(100) < 80)
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40 foodlev = 3; /* > 80% of pack */
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41 } else if(curcarry > 3 * topcarry) {
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42 if(rnd(100) < 60)
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43 foodlev = 2; /* > 60% of pack */
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44 } else
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45 foodlev = 1; /* <= 60% of pack */
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46 }
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47 tp->t_stats.s_pack = curcarry; /* update pack weight */
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48 }
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49
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50
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51 /*
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52 * packweight:
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53 * Get the total weight of the hero's pack
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54 */
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55
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56 int
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57 packweight(struct thing *tp)
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58 {
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59 reg struct object *obj;
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60 reg struct linked_list *pc;
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61 reg int weight;
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62
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63 weight = 0;
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64 for (pc = tp->t_pack ; pc != NULL ; pc = next(pc)) {
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65 obj = OBJPTR(pc);
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66 weight += itemweight(obj);
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67 }
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68 if (weight < 0) /* in case of amulet */
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69 weight = 0;
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70
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71 /* If this is the player, is he wearing a ring of carrying? */
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72 if (tp == &player && ISWEARING(R_CARRY)) {
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73 register int temp, i;
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74
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75 temp = 0;
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76 for (i=0; i<NUM_FINGERS; i++) {
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77 if (cur_ring[i] != NULL && cur_ring[i]->o_which == R_CARRY) {
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78 if (cur_ring[i]->o_flags & ISCURSED) temp--;
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79 else temp += 2;
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80 }
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81 }
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82 weight -= (temp * weight) / 4;
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83 }
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84
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85 return(weight);
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86 }
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87
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88 /*
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89 * itemweight:
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90 * Get the weight of an object
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91 */
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