dict.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

/*
 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
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 * http://oss.sgi.com/projects/FreeB/
 * shall be included in all copies or substantial portions of the Software.
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/*
** Author: Eric Veach, July 1994.
**
** $Date: 2006/04/19 14:42:01 $ $Revision: 1.3 $
** $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libtess/dict.c,v 1.3 2006/04/19 14:42:01 brianp Exp $
*/

#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;
}