/***************************************************************************//*                                                                         *//*  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 */