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annotate rogue4/list.c @ 312:029c1f5c5588

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Update the Autoconf files. These are mostly automatic updates for obsolete macros.
author John "Elwin" Edwards
date Tue, 11 May 2021 22:30:03 -0400
parents 1b73a8641b37
children
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1 /*
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2 * Functions for dealing with linked lists of goodies
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3 *
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4 * @(#)list.c 4.7 (Berkeley) 12/19/81
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5 *
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6 * Rogue: Exploring the Dungeons of Doom
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7 * Copyright (C) 1980, 1981, 1982 Michael Toy, Ken Arnold and Glenn Wichman
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8 * All rights reserved.
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9 *
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10 * See the file LICENSE.TXT for full copyright and licensing information.
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11 */
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12
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13 #include <stdlib.h>
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14 #include <curses.h>
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15 #include "rogue.h"
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16
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17 /*
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18 * detach:
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19 * Takes an item out of whatever linked list it might be in
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20 */
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21 void
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22 _detach(THING **list, THING *item)
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23 {
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24 if (*list == item)
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25 *list = next(item);
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26 if (prev(item) != NULL) item->l_prev->l_next = next(item);
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27 if (next(item) != NULL) item->l_next->l_prev = prev(item);
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28 item->l_next = NULL;
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29 item->l_prev = NULL;
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30 }
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31
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32 /*
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33 * _attach:
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34 * add an item to the head of a list
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35 */
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36 void
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37 _attach(THING **list, THING *item)
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38 {
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39 if (*list != NULL)
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40 {
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41 item->l_next = *list;
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42 (*list)->l_prev = item;
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43 item->l_prev = NULL;
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44 }
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45 else
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46 {
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47 item->l_next = NULL;
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48 item->l_prev = NULL;
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49 }
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50 *list = item;
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51 }
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52
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53 /*
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54 * _free_list:
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55 * Throw the whole blamed thing away
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56 */
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57 void
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58 _free_list(THING **ptr)
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59 {
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60 register THING *item;
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61
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62 while (*ptr != NULL)
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63 {
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64 item = *ptr;
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65 *ptr = next(item);
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66 discard(item);
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67 }
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68 }
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69
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70 /*
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71 * discard:
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72 * Free up an item
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73 */
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74 void
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75 discard(THING *item)
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76 {
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77 total--;
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78 free((char *) item);
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79 }
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80
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81 /*
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82 * new_item
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83 * Get a new item with a specified size
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84 */
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85 THING *
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86 new_item(void)
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87 {
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88 register THING *item;
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89
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90 if ((item = calloc(1, sizeof *item)) == NULL)
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91 msg("ran out of memory after %d items", total);
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92 else
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93 total++;
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94 item->l_next = item->l_prev = NULL;
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95 return item;
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96 }