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annotate rogue4/list.c @ 306:057c5114e244

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Super-Rogue: fix some out-of-range constants. Constants K_ARROW etc., for causes of death other than monsters, are in the 240-255 range. They were often passed to functions taking char, which is usually signed, making the values out of range. The function declarations have been changed to unsigned char, which is also the type used by the scoreboard code.
author John "Elwin" Edwards
date Sat, 17 Apr 2021 15:41:12 -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 }