list.c

usbport-sl811usb主控器芯片usb程序实现

/*
 * Copyright (c) 2007, Benedikt Sauter <[e-mail]>
 * All rights reserved.
 *
 * Short descripton of file:
 *
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright 
 *     notice, this list of conditions and the following disclaimer.
 *   * 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.
 *   * Neither the name of the FH Augsburg nor the names of its 
 *     contributors may be used to endorse or promote products derived 
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
 * "AS IS" AND ANY EXPRESS 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 COPYRIGHT 
 * OWNER OR 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.
 */
#include <stdlib.h>
#include "list.h"

list* list_create()
{
  list *l = (list*)malloc(sizeof(list));
  l->head = NULL;
  return l;
}

u8 list_add_tail(list *l, element *e)
{
  e->next = NULL;

  /* if head is empty put first element here */
  if(l->head==NULL){
    l->head = e;
    return 1;
  }

  /* find last element */
  element * iterator;
  iterator = l->head;

  while(iterator->next!=NULL) {
    iterator = iterator->next;
  } 
  iterator->next = e;

  return 1;
}



// FIXME: untested and unused!! 
u8 list_delete_element(list *l, element *e)
{
  return 1;
}

// FIXME: untested and unused!! 
u8 list_is_element_last(list *l, element *e)
{
  if(e->next==NULL)
    return 1;
  else
    return 0;
}



// FIXME: untested and unused!! 
element * list_find_next_element(list *l, element *e)
{
  element * iterator;
  iterator = l->head;

  while(iterator!=NULL){
    if(iterator == e)
      return iterator->next;
    iterator = iterator->next;
  }
  return NULL;
}