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annotate rogue4/list.c @ 145:aac28331e71d

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Advanced Rogue family: fix the "score" option. Changing the score file (when permitted) now works again, closing the old score file and opening the new one.
author John "Elwin" Edwards
date Wed, 20 May 2015 08:42:17 -0400
parents 9535a08ddc39
children 1b73a8641b37
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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12
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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 _detach(list, item)
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22 register THING **list, *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 _attach(list, item)
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37 register THING **list, *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 _free_list(ptr)
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58 register 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 discard(item)
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75 register 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()
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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 }