dict.c

/*
 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice including the dates of first publication and
 * either this permission notice or a reference to
 * http://oss.sgi.com/projects/FreeB/
 * shall be included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * Except as contained in this notice, the name of Silicon Graphics, Inc.
 * shall not be used in advertising or otherwise to promote the sale, use or
 * other dealings in this Software without prior written authorization from
 * Silicon Graphics, Inc.
 */
/*
** Author: Eric Veach, July 1994.
**
*/

#include <stddef.h>
#include "dict-list.h"
#include "memalloc.h"

/* really __gl_dictListNewDict */
Dict *dictNewDict( void *frame,
		   int (*leq)(void *frame, DictKey key1, DictKey key2) )
{
  Dict *dict = (Dict *) memAlloc( sizeof( Dict ));
  DictNode *head;

  if (dict == NULL) return NULL;

  head = &dict->head;

  head->key = NULL;
  head->next = head;
  head->prev = head;

  dict->frame = frame;
  dict->leq = leq;

  return dict;
}

/* really __gl_dictListDeleteDict */
void dictDeleteDict( Dict *dict )
{
  DictNode *node, *next;

  for( node = dict->head.next; node != &dict->head; node = next ) {
    next = node->next;
    memFree( node );
  }
  memFree( dict );
}

/* really __gl_dictListInsertBefore */
DictNode *dictInsertBefore( Dict *dict, DictNode *node, DictKey key )
{
  DictNode *newNode;

  do {
    node = node->prev;
  } while( node->key != NULL && ! (*dict->leq)(dict->frame, node->key, key));

  newNode = (DictNode *) memAlloc( sizeof( DictNode ));
  if (newNode == NULL) return NULL;

  newNode->key = key;
  newNode->next = node->next;
  node->next->prev = newNode;
  newNode->prev = node;
  node->next = newNode;

  return newNode;
}

/* really __gl_dictListDelete */
void dictDelete( Dict *dict, DictNode *node ) /*ARGSUSED*/
{
  node->next->prev = node->prev;
  node->prev->next = node->next;
  memFree( node );
}

/* really __gl_dictListSearch */
DictNode *dictSearch( Dict *dict, DictKey key )
{
  DictNode *node = &dict->head;

  do {
    node = node->next;
  } while( node->key != NULL && ! (*dict->leq)(dict->frame, key, node->key));

  return node;
}