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77 lines
1.4 KiB
C
77 lines
1.4 KiB
C
/* Copyright (C) 2021,2022 fef <owo@fef.moe>. All rights reserved. */
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#include <gay/clist.h>
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#include <gay/config.h>
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#include <gay/kprintf.h>
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#include <gay/poison.h>
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#include <gay/systm.h>
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#if CFG_DEBUG_CLIST
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#define CLIST_DEBUG_BLOCK
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#define CLIST_ASSERT(x) KASSERT(x)
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#else
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#define CLIST_DEBUG_BLOCK if (0)
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#define CLIST_ASSERT(x) ({})
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#endif
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void clist_init(struct clist *head)
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{
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CLIST_DEBUG_BLOCK {
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if (head->next == head && head->prev == head)
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kprintf("clist_init(%p) called multiple times\n", head);
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}
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head->next = head;
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head->prev = head;
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}
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void clist_add(struct clist *head, struct clist *new)
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{
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CLIST_ASSERT(!sus_nil(head->next));
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CLIST_ASSERT(!sus_nil(new));
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head->prev->next = new;
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new->next = head;
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new->prev = head->prev;
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head->prev = new;
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}
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void clist_add_first(struct clist *head, struct clist *new)
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{
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head->next->prev = new;
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new->next = head->next;
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new->prev = head;
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head->next = new;
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}
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void clist_del(struct clist *node)
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{
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node->next->prev = node->prev;
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node->prev->next = node->next;
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CLIST_DEBUG_BLOCK {
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node->next = (struct clist *)CLIST_POISON_NEXT;
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node->prev = (struct clist *)CLIST_POISON_PREV;
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}
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}
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struct clist *clist_del_first(struct clist *head)
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{
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CLIST_ASSERT(!clist_is_empty(head));
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struct clist *first = head->next;
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clist_del(first);
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return first;
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}
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struct clist *clist_del_last(struct clist *head)
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{
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CLIST_ASSERT(!clist_is_empty(head));
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struct clist *last = head->prev;
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clist_del(last);
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return last;
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}
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