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annotate rogue3/list.c @ 221:71cb5b647f2b

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Rogue V5: remove troublesome automatic platform detection. configure.ac used AC_CANONICAL_SYSTEM to guess the GNU system description triplets. The target description was substituted into the Makefile and formatted into the filename for the binary distribution tarball. But 'target' is only intended for cross-compilers. 'host_os' might have been a better choice. The tarball filename can still be changed manually, by running make with an argument of 'DESTSYS=systemname'. Cross-compiling may be more difficult now, but I am not certain that it worked properly previously, and due to pending autoconf changes, it was likely to break anyway. The top-level config.guess and config.sub are no longer needed, but they may reappear if better support for cross-compilation is added.
author John "Elwin" Edwards
date Fri, 12 Feb 2016 14:25:47 -0500
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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