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202 lines
4.7 KiB
C
Executable File
202 lines
4.7 KiB
C
Executable File
/* $OpenBSD: pqueue.c,v 1.5 2014/06/12 15:49:31 deraadt Exp $ */
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/*
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* DTLS implementation written by Nagendra Modadugu
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* (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
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*/
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/* ====================================================================
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* Copyright (c) 1999-2005 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "pqueue.h"
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typedef struct _pqueue {
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pitem *items;
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int count;
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} pqueue_s;
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pitem *
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pitem_new(unsigned char *prio64be, void *data)
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{
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pitem *item = malloc(sizeof(pitem));
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if (item == NULL)
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return NULL;
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memcpy(item->priority, prio64be, sizeof(item->priority));
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item->data = data;
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item->next = NULL;
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return item;
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}
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void
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pitem_free(pitem *item)
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{
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free(item);
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}
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pqueue_s *
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pqueue_new(void)
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{
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return calloc(1, sizeof(pqueue_s));
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}
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void
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pqueue_free(pqueue_s *pq)
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{
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free(pq);
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}
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pitem *
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pqueue_insert(pqueue_s *pq, pitem *item)
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{
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pitem *curr, *next;
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if (pq->items == NULL) {
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pq->items = item;
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return item;
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}
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for (curr = NULL, next = pq->items; next != NULL;
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curr = next, next = next->next) {
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/* we can compare 64-bit value in big-endian encoding
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* with memcmp:-) */
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int cmp = memcmp(next->priority, item->priority,
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sizeof(item->priority));
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if (cmp > 0) { /* next > item */
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item->next = next;
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if (curr == NULL)
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pq->items = item;
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else
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curr->next = item;
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return item;
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} else if (cmp == 0) /* duplicates not allowed */
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return NULL;
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}
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item->next = NULL;
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curr->next = item;
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return item;
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}
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pitem *
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pqueue_peek(pqueue_s *pq)
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{
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return pq->items;
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}
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pitem *
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pqueue_pop(pqueue_s *pq)
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{
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pitem *item = pq->items;
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if (pq->items != NULL)
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pq->items = pq->items->next;
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return item;
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}
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pitem *
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pqueue_find(pqueue_s *pq, unsigned char *prio64be)
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{
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pitem *next;
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for (next = pq->items; next != NULL; next = next->next)
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if (memcmp(next->priority, prio64be,
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sizeof(next->priority)) == 0)
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return next;
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return NULL;
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}
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pitem *
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pqueue_iterator(pqueue_s *pq)
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{
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return pqueue_peek(pq);
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}
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pitem *
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pqueue_next(pitem **item)
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{
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pitem *ret;
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if (item == NULL || *item == NULL)
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return NULL;
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/* *item != NULL */
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ret = *item;
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*item = (*item)->next;
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return ret;
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}
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int
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pqueue_size(pqueue_s *pq)
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{
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pitem *item = pq->items;
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int count = 0;
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while (item != NULL) {
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count++;
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item = item->next;
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}
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return count;
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}
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