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annotate xrogue/list.c @ 133:e6179860cb76

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Import XRogue 8.0 from the Roguelike Restoration Project (r1490)
author John "Elwin" Edwards
date Tue, 21 Apr 2015 08:55:20 -0400
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children ce0cf824c192
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1 /*
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2 list.c - Functions for dealing with linked lists of goodies
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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 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 #include <stdlib.h>
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20 #include <curses.h>
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21 #include "rogue.h"
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22
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23 /*
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24 * detach:
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25 * Takes an item out of whatever linked list it might be in
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26 */
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27
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28 _detach(list, item)
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29 register struct linked_list **list, *item;
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30 {
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31 if (*list == item)
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32 *list = next(item);
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33 if (prev(item) != NULL) item->l_prev->l_next = next(item);
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34 if (next(item) != NULL) item->l_next->l_prev = prev(item);
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35 item->l_next = NULL;
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36 item->l_prev = NULL;
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37 }
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38
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39 /*
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40 * _attach:
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41 * add an item to the head of a list
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42 */
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43
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44 _attach(list, item)
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45 register struct linked_list **list, *item;
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46 {
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47 if (*list != NULL)
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48 {
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49 item->l_next = *list;
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50 (*list)->l_prev = item;
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51 item->l_prev = NULL;
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52 }
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53 else
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54 {
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55 item->l_next = NULL;
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56 item->l_prev = NULL;
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57 }
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58
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59 *list = item;
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60 }
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61
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62 /*
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63 * o_free_list:
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64 * Throw the whole object list away
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65 */
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66
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67 _o_free_list(ptr)
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68 register struct linked_list **ptr;
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69 {
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70 register struct linked_list *item;
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71
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72 while (*ptr != NULL)
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73 {
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74 item = *ptr;
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75 *ptr = next(item);
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76 o_discard(item);
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77 }
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78 }
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79
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80 /*
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81 * o_discard:
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82 * free up an item and its object(and maybe contents)
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83 */
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84
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85 o_discard(item)
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86 register struct linked_list *item;
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87 {
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88 register struct object *obj;
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89
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90 obj = OBJPTR(item);
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91 if (obj->contents != NULL)
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92 o_free_list(obj->contents);
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