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annotate rogue3/list.c @ 81:0e212d46b68f

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rogue4: don't put savefile metadata into the savefile. The save_file() function in save.c stored the savefile's device number, inode number, creation time, and modification time in the file. The restore() function read them back, and apparently used to compare them to protect against cheaters. Unfortunately, the types and sizes of these numbers differ from system to system, which ruins the Roguelike Restoration Project's fine portability work. So they have been removed from the savefile. This BREAKS SAVEFILE COMPATIBILITY, but old files can be converted by excising the chunk starting at offset 0x22 with length sizeof(ino_t) + sizeof(dev_t) + 2 * sizeof(time_t). That's 0x14 on i686 and 0x20 on x86_64, at least with current versions of Linux and glibc.
author John "Elwin" Edwards
date Mon, 05 Aug 2013 20:49:41 -0700
parents 527e2150eaf0
children 0250220d8cdd
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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 3.3 (Berkeley) 6/15/81
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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 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 "curses.h"
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14 #include <stdlib.h>
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15 #include <string.h>
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16 #include "machdep.h"
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17 #include "rogue.h"
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18
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19 /*
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20 * detach:
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21 * Takes an item out of whatever linked list it might be in
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22 */
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23
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24 void
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25 _detach(struct linked_list **list, struct linked_list *item)
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26 {
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27 if (*list == item)
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28 *list = next(item);
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29 if (prev(item) != NULL) item->l_prev->l_next = next(item);
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30 if (next(item) != NULL) item->l_next->l_prev = prev(item);
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31 item->l_next = NULL;
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32 item->l_prev = NULL;
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33 }
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34
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35 /*
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36 * _attach:
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37 * add an item to the head of a list
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38 */
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39
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40 void
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41 _attach(struct linked_list **list, struct linked_list *item)
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42 {
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43 if (*list != NULL)
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44 {
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45 item->l_next = *list;
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46 (*list)->l_prev = item;
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47 item->l_prev = NULL;
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48 }
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49 else
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50 {
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51 item->l_next = NULL;
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52 item->l_prev = NULL;
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53 }
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54
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55 *list = item;
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56 }
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57
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58 /*
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59 * _free_list:
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60 * Throw the whole blamed thing away
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61 */
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62
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63 void
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64 _free_list(struct linked_list **ptr)
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65 {
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66 struct linked_list *item;
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67
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68 while (*ptr != NULL)
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69 {
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70 item = *ptr;
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71 *ptr = next(item);
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72 discard(item);
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73 }
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74 }
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75
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76 /*
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77 * discard:
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78 * free up an item
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79 */
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80
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81 void
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82 discard(struct linked_list *item)
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83 {
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84 total -= 2;
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85 FREE(item->l_data);
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86 FREE(item);
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87 }
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88
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89 /*
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90 * new_item
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91 * get a new item with a specified size
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92 */
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93
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94 struct linked_list *
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95 new_item(int size)
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96 {
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97 struct linked_list *item;
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98
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99 if ((item = (struct linked_list *) _new(sizeof *item)) == NULL)
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100 {
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101 msg("Ran out of memory for header after %d items", total);
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102 return NULL;
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103 }
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104
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105 if ((item->l_data = _new(size)) == NULL)
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106 {
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