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annotate urogue/pack.c @ 299:74351bf23e5e

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Fix another pointer bug related to object stacks.
author John "Elwin" Edwards
date Sun, 11 Feb 2018 15:37:33 -0500
parents c495a4f288c6
children
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1 /*
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2 pack.c - Routines to deal with the pack.
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3
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4 UltraRogue: The Ultimate Adventure in the Dungeons of Doom
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5 Copyright (C) 1985, 1986, 1992, 1993, 1995 Herb Chong
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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
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10 All rights reserved.
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11
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12 Based on "Rogue: Exploring the Dungeons of Doom"
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13 Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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14 All rights reserved.
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15
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16 See the file LICENSE.TXT for full copyright and licensing information.
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17 */
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18
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19 /*
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20 Notes
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21
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22 The new pack is implemented through the use of bags,
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23 and items are classed by their types (see rogue.h) which also
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24 happen to be their display character.
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25 */
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26
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27 #include <stdlib.h>
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28 #include <ctype.h>
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29 #include "rogue.h"
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30
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31 #define ESCAPE_EXIT(x) if (x == ESCAPE) {after = FALSE; msg(""); return(NULL);}
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32 #define BAD_NEWS -1
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33 #define BAD_LIST ((struct linked_list *) BAD_NEWS)
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34 #define GOOD_NEWS 0
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35
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36 static char type_list[] = "!?])/=:,"; /* things to inventory */
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37
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38 /*
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39 swap_top()
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40 Takes an stacked object and exchanges places with the top
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41 object. <node> must belong to the <top>'s stacked object list.
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42 */
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43
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44 void
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45 swap_top(struct linked_list *top, struct linked_list *node)
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46 {
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47 struct object *obt, *obn;
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48
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49 obt = OBJPTR(top);
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50 obn = OBJPTR(node);
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51
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52 detach((obt->next_obj), node); /* Take it out of the stack */
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53 attach(lvl_obj, node); /* and put it into the level */
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54 detach(lvl_obj, top); /* Remove item from level */
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55
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56 obn->next_obj = obt->next_obj;
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57 obt->next_obj = NULL;
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58
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59 if (obn->next_obj)
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60 obn->next_obj->l_prev = NULL;
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61
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62 attach((obn->next_obj), top);
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63 }
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64
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65
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66 /*
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67 get_all()
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68 Get as many stacked items as possible.
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69 */
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70
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71 void
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72 get_all(struct linked_list *top)
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73 {
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74 struct linked_list *node;
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75 struct object *obt;
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76
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77 while (top)
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78 {
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79 obt = OBJPTR(top);
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80 node = obt->next_obj;
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81
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82 rem_obj(top, FALSE);
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83
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84 if (!add_pack(top, FALSE))
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85 return;
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86
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87 top = node;
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88 }
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89 }
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90
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91
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92 /*
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93 get_stack()
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94 Allows the user to chose from a stack of items.