coap_list.c

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/* coap_list.c -- CoAP list structures
 *
 * Copyright (C) 2010,2011 Olaf Bergmann <bergmann@tzi.org>
 *
 * This file is part of the CoAP library libcoap. Please see
 * README for terms of use. 
 */

#include "config.h"

#include <stdio.h>
#include <string.h>

#include "debug.h"
#include "mem.h"
#include "coap_list.h"

int
coap_insert(coap_list_t **queue, coap_list_t *node,
        int (*order)(void *, void *node) ) {
  coap_list_t *p, *q;
  if ( !queue || !node )
    return 0;

  /* set queue head if empty */
  if ( !*queue ) {
    *queue = node;
    return 1;
  }

  /* replace queue head if new node has to be added before the existing queue head */
  q = *queue;
  if ( order( node->data, q->data ) < 0) {
    node->next = q;
    *queue = node;
    return 1;
  }

  /* search for right place to insert */
  do {
    p = q;
    q = q->next;
  } while ( q && order( node->data, q->data ) >= 0);

  /* insert new item */
  node->next = q;
  p->next = node;
  return 1;
}

int
coap_delete(coap_list_t *node) {
  if ( !node )
    return 0;

  if ( node->delete_func )
    node->delete_func( node->data );
  coap_free( node->data );
  coap_free( node );

  return 1;
}

void
coap_delete_list(coap_list_t *queue) {
  if ( !queue )
    return;

  coap_delete_list( queue->next );
  coap_delete( queue );
}

coap_list_t *
coap_new_listnode(void *data, void (*delete_func)(void *) ) {
  coap_list_t *node = coap_malloc( sizeof(coap_list_t) );
  if ( ! node ) {
#ifndef NDEBUG
    coap_log(LOG_CRIT, "coap_new_listnode: malloc\n");
#endif
    return NULL;
  }

  memset(node, 0, sizeof(coap_list_t));
  node->data = data;
  node->delete_func = delete_func;
  return node;
}