src/glu/sgi/libtess/dict.c

   1 /*
   2 ** License Applicability. Except to the extent portions of this file are
   3 ** made subject to an alternative license as permitted in the SGI Free
   4 ** Software License B, Version 1.1 (the "License"), the contents of this
   5 ** file are subject only to the provisions of the License. You may not use
   6 ** this file except in compliance with the License. You may obtain a copy
   7 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
   8 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
   9 **
  10 ** http://oss.sgi.com/projects/FreeB
  11 **
  12 ** Note that, as provided in the License, the Software is distributed on an
  13 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
  14 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
  15 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
  16 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
  17 **
  18 ** Original Code. The Original Code is: OpenGL Sample Implementation,
  19 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
  20 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
  21 ** Copyright in any portions created by third parties is as indicated
  22 ** elsewhere herein. All Rights Reserved.
  23 **
  24 ** Additional Notice Provisions: The application programming interfaces
  25 ** established by SGI in conjunction with the Original Code are The
  26 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
  27 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
  28 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
  29 ** Window System(R) (Version 1.3), released October 19, 1998. This software
  30 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
  31 ** published by SGI, but has not been independently verified as being
  32 ** compliant with the OpenGL(R) version 1.2.1 Specification.
  33 **
  34 */
  35 /*
  36 ** Author: Eric Veach, July 1994.
  37 **
  38 */
  39
  40 #include <stddef.h>
  41 #include "dict-list.h"
  42 #include "memalloc.h"
  43
  44 /* really __gl_dictListNewDict */
  45 Dict *dictNewDict( void *frame,
  46                    int (*leq)(void *frame, DictKey key1, DictKey key2) )
  47 {
  48   Dict *dict = (Dict *) memAlloc( sizeof( Dict ));
  49   DictNode *head;
  50
  51   if (dict == NULL) return NULL;
  52
  53   head = &dict->head;
  54
  55   head->key = NULL;
  56   head->next = head;
  57   head->prev = head;
  58
  59   dict->frame = frame;
  60   dict->leq = leq;
  61
  62   return dict;
  63 }
  64
  65 /* really __gl_dictListDeleteDict */
  66 void dictDeleteDict( Dict *dict )
  67 {
  68   DictNode *node, *next;
  69
  70   for( node = dict->head.next; node != &dict->head; node = next ) {
  71     next = node->next;
  72     memFree( node );
  73   }
  74   memFree( dict );
  75 }
  76
  77 /* really __gl_dictListInsertBefore */
  78 DictNode *dictInsertBefore( Dict *dict, DictNode *node, DictKey key )
  79 {
  80   DictNode *newNode;
  81
  82   do {
  83     node = node->prev;
  84   } while( node->key != NULL && ! (*dict->leq)(dict->frame, node->key, key));
  85
  86   newNode = (DictNode *) memAlloc( sizeof( DictNode ));
  87   if (newNode == NULL) return NULL;
  88
  89   newNode->key = key;
  90   newNode->next = node->next;
  91   node->next->prev = newNode;
  92   newNode->prev = node;
  93   node->next = newNode;
  94
  95   return newNode;
  96 }
  97
  98 /* really __gl_dictListDelete */
  99 void dictDelete( Dict *dict, DictNode *node ) /*ARGSUSED*/
 100 {
 101   node->next->prev = node->prev;
 102   node->prev->next = node->next;
 103   memFree( node );
 104 }
 105
 106 /* really __gl_dictListSearch */
 107 DictNode *dictSearch( Dict *dict, DictKey key )
 108 {
 109   DictNode *node = &dict->head;
 110
 111   do {
 112     node = node->next;
 113   } while( node->key != NULL && ! (*dict->leq)(dict->frame, key, node->key));
 114
 115   return node;
 116 }