108 lines
1.9 KiB
C
108 lines
1.9 KiB
C
/*
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* Functions for dealing with linked lists of goodies
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*
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* @(#)list.c 9.0 (rdk) 7/17/84
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*
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* Super-Rogue
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* Copyright (C) 1984 Robert D. Kindelberger
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* All rights reserved.
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*
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* Based on "Rogue: Exploring the Dungeons of Doom"
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* Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
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* All rights reserved.
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*
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* See the file LICENSE.TXT for full copyright and licensing information.
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*/
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#include <stdlib.h>
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#include "rogue.h"
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#include "rogue.ext"
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/*
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* detach:
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* Takes an item out of whatever linked list it might be in
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*/
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void
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_detach(struct linked_list **list, struct linked_list *item)
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{
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if (*list == item)
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*list = next(item);
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if (prev(item) != NULL)
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item->l_prev->l_next = next(item);
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if (next(item) != NULL)
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item->l_next->l_prev = prev(item);
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item->l_next = NULL;
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item->l_prev = NULL;
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}
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/*
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* _attach: add an item to the head of a list
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*/
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void
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_attach(struct linked_list **list, struct linked_list *item)
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{
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if (*list != NULL) {
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item->l_next = *list;
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(*list)->l_prev = item;
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item->l_prev = NULL;
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}
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else {
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item->l_next = NULL;
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item->l_prev = NULL;
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}
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*list = item;
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}
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/*
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* _free_list: Throw the whole blamed thing away
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*/
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void
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_free_list(struct linked_list **ptr)
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{
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register struct linked_list *item;
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while (*ptr != NULL) {
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item = *ptr;
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*ptr = next(item);
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discard(item);
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}
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}
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/*
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* discard: free up an item
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*/
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void
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discard(struct linked_list *item)
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{
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total -= 2;
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FREE(item->l_data);
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FREE(item);
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}
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/*
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* new_item: get a new item with a specified size
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*/
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struct linked_list *
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new_item(int size)
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{
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register struct linked_list *item;
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item = (struct linked_list *) new(sizeof *item);
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item->l_data = new(size);
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item->l_next = item->l_prev = NULL;
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return item;
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}
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char *
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new(int size)
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{
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register char *space = ALLOC(size);
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if (space == NULL) {
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sprintf(prbuf,"Rogue ran out of memory (%ld).", md_memused());
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fatal(prbuf);
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}
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total++;
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return space;
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}
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