IABSD.fr/src/lib/libssl/pqueue.c

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• Author : tb
  Date : 2025-05-04 10:53:38
  Hash : 8ee62dda
  Message : sigh. pqueue_find() also needs a const treatment

• lib/libssl/pqueue.c

• /* $OpenBSD: pqueue.c,v 1.7 2025/05/04 10:53:38 tb Exp $ */
  /*
   * DTLS implementation written by Nagendra Modadugu
   * (nagendra@cs.stanford.edu) for the OpenSSL project 2005.
   */
  /* ====================================================================
   * Copyright (c) 1999-2005 The OpenSSL Project.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. All advertising materials mentioning features or use of this
   *    software must display the following acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
   *
   * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
   *    endorse or promote products derived from this software without
   *    prior written permission. For written permission, please contact
   *    openssl-core@OpenSSL.org.
   *
   * 5. Products derived from this software may not be called "OpenSSL"
   *    nor may "OpenSSL" appear in their names without prior written
   *    permission of the OpenSSL Project.
   *
   * 6. Redistributions of any form whatsoever must retain the following
   *    acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
   *
   * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
   * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   * OF THE POSSIBILITY OF SUCH DAMAGE.
   * ====================================================================
   *
   * This product includes cryptographic software written by Eric Young
   * (eay@cryptsoft.com).  This product includes software written by Tim
   * Hudson (tjh@cryptsoft.com).
   *
   */
  
  #include <stdlib.h>
  #include <string.h>
  
  #include "pqueue.h"
  
  typedef struct _pqueue {
  	pitem *items;
  	int count;
  } pqueue_s;
  
  pitem *
  pitem_new(const unsigned char *prio64be, void *data)
  {
  	pitem *item = malloc(sizeof(pitem));
  
  	if (item == NULL)
  		return NULL;
  
  	memcpy(item->priority, prio64be, sizeof(item->priority));
  
  	item->data = data;
  	item->next = NULL;
  
  	return item;
  }
  
  void
  pitem_free(pitem *item)
  {
  	free(item);
  }
  
  pqueue_s *
  pqueue_new(void)
  {
  	return calloc(1, sizeof(pqueue_s));
  }
  
  void
  pqueue_free(pqueue_s *pq)
  {
  	free(pq);
  }
  
  pitem *
  pqueue_insert(pqueue_s *pq, pitem *item)
  {
  	pitem *curr, *next;
  
  	if (pq->items == NULL) {
  		pq->items = item;
  		return item;
  	}
  
  	for (curr = NULL, next = pq->items; next != NULL;
  	    curr = next, next = next->next) {
  		/* we can compare 64-bit value in big-endian encoding
  		 * with memcmp:-) */
  		int cmp = memcmp(next->priority, item->priority,
  		    sizeof(item->priority));
  		if (cmp > 0) {		/* next > item */
  			item->next = next;
  
  			if (curr == NULL)
  				pq->items = item;
  			else
  				curr->next = item;
  
  			return item;
  		} else if (cmp == 0)	/* duplicates not allowed */
  			return NULL;
  	}
  
  	item->next = NULL;
  	curr->next = item;
  
  	return item;
  }
  
  pitem *
  pqueue_peek(pqueue_s *pq)
  {
  	return pq->items;
  }
  
  pitem *
  pqueue_pop(pqueue_s *pq)
  {
  	pitem *item = pq->items;
  
  	if (pq->items != NULL)
  		pq->items = pq->items->next;
  
  	return item;
  }
  
  pitem *
  pqueue_find(pqueue_s *pq, const unsigned char *prio64be)
  {
  	pitem *next;
  
  	for (next = pq->items; next != NULL; next = next->next)
  		if (memcmp(next->priority, prio64be,
  		    sizeof(next->priority)) == 0)
  			return next;
  
  	return NULL;
  }
  
  pitem *
  pqueue_iterator(pqueue_s *pq)
  {
  	return pqueue_peek(pq);
  }
  
  pitem *
  pqueue_next(pitem **item)
  {
  	pitem *ret;
  
  	if (item == NULL || *item == NULL)
  		return NULL;
  
  	/* *item != NULL */
  	ret = *item;
  	*item = (*item)->next;
  
  	return ret;
  }
  
  int
  pqueue_size(pqueue_s *pq)
  {
  	pitem *item = pq->items;
  	int count = 0;
  
  	while (item != NULL) {
  		count++;
  		item = item->next;
  	}
  	return count;
  }