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- /***************************************************************************/
- /* */
- /* ftlist.c */
- /* */
- /* Generic list support for FreeType (body). */
- /* */
- /* Copyright 1996-2001, 2002 by */
- /* David Turner, Robert Wilhelm, and Werner Lemberg. */
- /* */
- /* This file is part of the FreeType project, and may only be used, */
- /* modified, and distributed under the terms of the FreeType project */
- /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
- /* this file you indicate that you have read the license and */
- /* understand and accept it fully. */
- /* */
- /***************************************************************************/
- /*************************************************************************/
- /* */
- /* This file implements functions relative to list processing. Its */
- /* data structures are defined in `freetype/internal/ftlist.h'. */
- /* */
- /*************************************************************************/
- #include <ft2build.h>
- #include FT_LIST_H
- #include FT_INTERNAL_DEBUG_H
- #include FT_INTERNAL_OBJECTS_H
- /*************************************************************************/
- /* */
- /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
- /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
- /* messages during execution. */
- /* */
- #undef FT_COMPONENT
- #define FT_COMPONENT trace_list
- /* documentation is in ftlist.h */
- FT_EXPORT_DEF( FT_ListNode )
- FT_List_Find( FT_List list,
- void* data )
- {
- FT_ListNode cur;
- cur = list->head;
- while ( cur )
- {
- if ( cur->data == data )
- return cur;
- cur = cur->next;
- }
- return (FT_ListNode)0;
- }
- /* documentation is in ftlist.h */
- FT_EXPORT_DEF( void )
- FT_List_Add( FT_List list,
- FT_ListNode node )
- {
- FT_ListNode before = list->tail;
- node->next = 0;
- node->prev = before;
- if ( before )
- before->next = node;
- else
- list->head = node;
- list->tail = node;
- }
- /* documentation is in ftlist.h */
- FT_EXPORT_DEF( void )
- FT_List_Insert( FT_List list,
- FT_ListNode node )
- {
- FT_ListNode after = list->head;
- node->next = after;
- node->prev = 0;
- if ( !after )
- list->tail = node;
- else
- after->prev = node;
- list->head = node;
- }
- /* documentation is in ftlist.h */
- FT_EXPORT_DEF( void )
- FT_List_Remove( FT_List list,
- FT_ListNode node )
- {
- FT_ListNode before, after;
- before = node->prev;
- after = node->next;
- if ( before )
- before->next = after;
- else
- list->head = after;
- if ( after )
- after->prev = before;
- else
- list->tail = before;
- }
- /* documentation is in ftlist.h */
- FT_EXPORT_DEF( void )
- FT_List_Up( FT_List list,
- FT_ListNode node )
- {
- FT_ListNode before, after;
- before = node->prev;
- after = node->next;
- /* check whether we are already on top of the list */
- if ( !before )
- return;
- before->next = after;
- if ( after )
- after->prev = before;
- else
- list->tail = before;
- node->prev = 0;
- node->next = list->head;
- list->head->prev = node;
- list->head = node;
- }
- /* documentation is in ftlist.h */
- FT_EXPORT_DEF( FT_Error )
- FT_List_Iterate( FT_List list,
- FT_List_Iterator iterator,
- void* user )
- {
- FT_ListNode cur = list->head;
- FT_Error error = FT_Err_Ok;
- while ( cur )
- {
- FT_ListNode next = cur->next;
- error = iterator( cur, user );
- if ( error )
- break;
- cur = next;
- }
- return error;
- }
- /* documentation is in ftlist.h */
- FT_EXPORT_DEF( void )
- FT_List_Finalize( FT_List list,
- FT_List_Destructor destroy,
- FT_Memory memory,
- void* user )
- {
- FT_ListNode cur;
- cur = list->head;
- while ( cur )
- {
- FT_ListNode next = cur->next;
- void* data = cur->data;
- if ( destroy )
- destroy( memory, data, user );
- FT_FREE( cur );
- cur = next;
- }
- list->head = 0;
- list->tail = 0;
- }
- /* END */
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