pineapple-src/externals/libressl/ssl/pqueue.c

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2020-12-28 15:15:37 +00:00
/* $OpenBSD: pqueue.c,v 1.5 2014/06/12 15:49:31 deraadt 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(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, 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;
}