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annotate arogue5/trader.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 c49f7927b0fa
children 56e748983fa8
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1 /*
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2 * Anything to do with trading posts
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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 "Super-Rogue"
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9 * Copyright (C) 1984 Robert D. Kindelberger
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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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c49f7927b0fa arogue5: add missing header files.
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17 #include <string.h>
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18
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19
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20
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21
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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 buy_it()
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28 {
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29 reg int wh;
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30 struct linked_list *item;
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31
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32 if (purse <= 0) {
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33 msg("You have no money.");
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34 return;
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35 }
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36 if (curprice < 0) { /* if not yet priced */
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37 wh = price_it();
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38 if (!wh) /* nothing to price */
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39 return;
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40 msg("Do you want to buy it? ");
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41 do {
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42 wh = tolower(readchar());
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43 if (wh == ESCAPE || wh == 'n') {
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44 msg("");
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45 return;
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46 }
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47 } until(wh == 'y');
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48 }
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49 mpos = 0;
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50 if (curprice > purse) {
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51 msg("You can't afford to buy that %s !",curpurch);
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52 return;
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53 }
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54 /*
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55 * See if the hero has done all his transacting
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56 */
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57 if (!open_market())
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58 return;
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59 /*
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60 * The hero bought the item here
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61 */
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62 item = find_obj(hero.y, hero.x);
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63 mpos = 0;
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64 if (add_pack(NULL,TRUE,&item)) { /* try to put it in his pack */
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65 purse -= curprice; /* take his money */
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66 ++trader; /* another transaction */
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67 trans_line(); /* show remaining deals */
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68 curprice = -1; /* reset stuff */
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69 curpurch[0] = 0;
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70 whatis (item); /* identify it after purchase */
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71 (OBJPTR(item))->o_flags &= ~ISPOST; /* turn off ISPOST */
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72 msg("%s", inv_name(OBJPTR(item), TRUE));
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73 }
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74 }
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75
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76 /*
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77 * do_post:
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78 * Put a trading post room and stuff on the screen
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79 */
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80 do_post()
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81 {
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82 coord tp;
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83 reg int i;
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84 reg struct room *rp;
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85 reg struct object *op;
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86 reg struct linked_list *ll;
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87
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88 o_free_list(lvl_obj); /* throw old items away */
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89
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90 for (rp = rooms; rp < &rooms[MAXROOMS]; rp++)
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91 rp->r_flags = ISGONE; /* kill all rooms */
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92
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93 rp = &rooms[0]; /* point to only room */
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94 rp->r_flags = 0; /* this room NOT gone */
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95 rp->r_max.x = 40;
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96 rp->r_max.y = 10; /* 10 * 40 room */
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97 rp->r_pos.x = (COLS - rp->r_max.x) / 2; /* center horizontal */
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98 rp->r_pos.y = 1; /* 2nd line */
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99 draw_room(rp); /* draw the only room */
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100 i = roll(4,10); /* 10 to 40 items */
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101 for (; i > 0 ; i--) { /* place all the items */
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102 ll = new_thing(ALL); /* get something */
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103 attach(lvl_obj, ll);
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104 op = OBJPTR(ll);
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