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annotate srogue/list.c @ 223:0e99eade579c

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Generate text documentation from the troff source files. This is done by make, in the 'docs' target, which is now part of the normal build process. Unfortunately, not all the games include troff sources. Getting decent HTML output from groff is still a difficult process which will not be attempted at this time. There are a few bugs in the 'install' and 'uninstall' rules. Not to mention that the documentation is sometimes inaccurate.
author John "Elwin" Edwards
date Sun, 21 Feb 2016 20:47:12 -0500
parents d6b7c3fb37ea
children 94a0d9dd5ce1
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36
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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 9.0 (rdk) 7/17/84
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5 *
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6 * Super-Rogue
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7 * Copyright (C) 1984 Robert D. Kindelberger
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8 * All rights reserved.
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9 *
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10 * Based on "Rogue: Exploring the Dungeons of Doom"
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11 * Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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12 * All rights reserved.
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13 *
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14 * See the file LICENSE.TXT for full copyright and licensing information.
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15 */
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16
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17 #include <stdlib.h>
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18 #include "rogue.h"
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19 #include "rogue.ext"
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20
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21 /*
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22 * detach:
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23 * Takes an item out of whatever linked list it might be in
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24 */
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25
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26 _detach(list, item)
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27 struct linked_list **list, *item;
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28 {
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29 if (*list == item)
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30 *list = next(item);
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31 if (prev(item) != NULL)
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32 item->l_prev->l_next = next(item);
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33 if (next(item) != NULL)
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34 item->l_next->l_prev = prev(item);
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35 item->l_next = NULL;
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36 item->l_prev = NULL;
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37 }
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38
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39 /*
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40 * _attach: add an item to the head of a list
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41 */
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42 _attach(list, item)
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43 struct linked_list **list, *item;
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44 {
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45 if (*list != NULL) {
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46 item->l_next = *list;
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47 (*list)->l_prev = item;
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48 item->l_prev = NULL;
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49 }
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50 else {
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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 *list = item;
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55 }
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56
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57 /*
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58 * _free_list: Throw the whole blamed thing away
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59 */
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60 _free_list(ptr)
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61 struct linked_list **ptr;
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62 {
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63 register struct linked_list *item;
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64
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65 while (*ptr != NULL) {
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66 item = *ptr;
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67 *ptr = next(item);
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68 discard(item);
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69 }
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70 }
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71
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72 /*
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73 * discard: free up an item
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74 */
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75 discard(item)
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76 struct linked_list *item;
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77 {
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78 total -= 2;
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79 FREE(item->l_data);
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80 FREE(item);
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81 }
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82
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83 /*
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84 * new_item: get a new item with a specified size
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85 */
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86 struct linked_list *
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87 new_item(size)
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88 int size;
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89 {
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90 register struct linked_list *item;
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91
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92 item = (struct linked_list *) new(sizeof *item);
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93 item->l_data = new(size);
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94 item->l_next = item->l_prev = NULL;
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95 return item;
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96 }
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97
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98 char *
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99 new(size)
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100 int size;
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101 {
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102 register char *space = ALLOC(size);
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103
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104 if (space == NULL) {
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105 sprintf(prbuf,"Rogue ran out of memory (%d).", md_memused());
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106 fatal(prbuf);
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107 }