src/glu/sgi/libtess/dict.c

   1 /*
   2  * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
   3  * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice including the dates of first publication and
  13  * either this permission notice or a reference to
  14  * http://oss.sgi.com/projects/FreeB/
  15  * shall be included in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  21  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
  22  * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23  * SOFTWARE.
  24  *
  25  * Except as contained in this notice, the name of Silicon Graphics, Inc.
  26  * shall not be used in advertising or otherwise to promote the sale, use or
  27  * other dealings in this Software without prior written authorization from
  28  * Silicon Graphics, Inc.
  29  */
  30 /*
  31 ** Author: Eric Veach, July 1994.
  32 **
  33 ** $Date: 2006/04/19 14:42:01 $ $Revision: 1.3 $
  34 ** $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 $
  35 */
  36
  37 #include <stddef.h>
  38 #include "dict-list.h"
  39 #include "memalloc.h"
  40
  41 /* really __gl_dictListNewDict */
  42 Dict *dictNewDict( void *frame,
  43                    int (*leq)(void *frame, DictKey key1, DictKey key2) )
  44 {
  45   Dict *dict = (Dict *) memAlloc( sizeof( Dict ));
  46   DictNode *head;
  47
  48   if (dict == NULL) return NULL;
  49
  50   head = &dict->head;
  51
  52   head->key = NULL;
  53   head->next = head;
  54   head->prev = head;
  55
  56   dict->frame = frame;
  57   dict->leq = leq;
  58
  59   return dict;
  60 }
  61
  62 /* really __gl_dictListDeleteDict */
  63 void dictDeleteDict( Dict *dict )
  64 {
  65   DictNode *node, *next;
  66
  67   for( node = dict->head.next; node != &dict->head; node = next ) {
  68     next = node->next;
  69     memFree( node );
  70   }
  71   memFree( dict );
  72 }
  73
  74 /* really __gl_dictListInsertBefore */
  75 DictNode *dictInsertBefore( Dict *dict, DictNode *node, DictKey key )
  76 {
  77   DictNode *newNode;
  78
  79   do {
  80     node = node->prev;
  81   } while( node->key != NULL && ! (*dict->leq)(dict->frame, node->key, key));
  82
  83   newNode = (DictNode *) memAlloc( sizeof( DictNode ));
  84   if (newNode == NULL) return NULL;
  85
  86   newNode->key = key;
  87   newNode->next = node->next;
  88   node->next->prev = newNode;
  89   newNode->prev = node;
  90   node->next = newNode;
  91
  92   return newNode;
  93 }
  94
  95 /* really __gl_dictListDelete */
  96 void dictDelete( Dict *dict, DictNode *node ) /*ARGSUSED*/
  97 {
  98   node->next->prev = node->prev;
  99   node->prev->next = node->next;
 100   memFree( node );
 101 }
 102
 103 /* really __gl_dictListSearch */
 104 DictNode *dictSearch( Dict *dict, DictKey key )
 105 {
 106   DictNode *node = &dict->head;
 107
 108   do {
 109     node = node->next;
 110   } while( node->key != NULL && ! (*dict->leq)(dict->frame, key, node->key));
 111
 112   return node;
 113 }