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annotate xrogue/trader.c @ 276:4573b355cdc1

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UltraRogue: prevent bad array accesses in call(). Marking non-magic items caused segfaults because item_color was set to NULL. item_type could also be used as an out-of-bounds index. These problems have been fixed by only using these variables when the mark argument is false, in which case they are properly initialized. A fall-through case statement was also fixed.
author John "Elwin" Edwards
date Sun, 10 Sep 2017 21:04:22 -0400
parents f54901b9c39b
children
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1 /*
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2 trader.c - Anything to do with trading posts
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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 <string.h>
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17 #include "rogue.h"
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18
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19 bool open_market(void);
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20 void trans_line(void);
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21 char *typ_name(struct object *obj);
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22
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23 /*
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24 * buy_it:
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25 * Buy the item on which the hero stands
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26 */
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27
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28 void
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29 buy_it(void)
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30 {
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31 reg int wh;
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32 struct linked_list *item = NULL;
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33 struct object *obj = NULL;
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34 int wasfood = FALSE;
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35
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36 if (purse <= 0) {
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37 msg("You have no money.");
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38 return;
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39 }
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40 if (curprice < 0) { /* if not yet priced */
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41 wh = price_it();
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42 if (!wh) /* nothing to price */
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43 return;
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44 msg("Do you want to buy it? ");
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45 do {
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46 wh = wgetch(cw);
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47 if (wh == ESC || wh == 'n') {
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48 msg("");
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49 return;
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50 }
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51 } until(wh == 'y');
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52 }
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53 mpos = 0;
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54 if (curprice > purse) {
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55 msg("You can't afford it!");
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56 return;
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57 }
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58 /*
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59 * See if the hero has done all his transacting
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60 */
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61 if (!open_market())
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62 return;
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63 /*
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64 * The hero bought the item here
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65 */
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66 item = find_obj(hero.y, hero.x);
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67 obj = OBJPTR(item);
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68 mpos = 0;
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69 wasfood = ISMULT(obj->o_type);
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70 if (add_pack((struct linked_list *)NULL,TRUE)) {/* try to put it in his pack */
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71 purse -= curprice; /* take his money */
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72 ++trader; /* another transaction */
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73 trans_line(); /* show remaining deals */
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74 curprice = -1; /* reset stuff */
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75 curpurch[0] = 0;
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76 if (!wasfood) /* if it was food then the object has been deleted */
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77 {
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78 whatis (item); /* identify it */
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79 obj = OBJPTR(item);
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80 obj->o_flags &= ~ISPOST; /* turn off ISPOST */
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81 obj->o_flags |= ISKNOW; /* he knows the item */
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82 msg("%s", inv_name(obj, TRUE));
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83 }
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84 else
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85 msg("a food ration.");
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86 }
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87 }
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88
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89 /*
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90 * do_post:
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91 * Put a trading post room and stuff on the screen
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