www.pudn.com > UCGUI390a.rar > GUIRealloc.c

/* 
********************************************************************************************************* 
*                                                uC/GUI 
*                        Universal graphic software for embedded applications 
* 
*                       (c) Copyright 2002, Micrium Inc., Weston, FL 
*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH 
* 
*              µC/GUI is protected by international copyright laws. Knowledge of the 
*              source code may not be used to write a similar product. This file may 
*              only be used in accordance with a license and should not be redistributed 
*              in any way. We appreciate your understanding and fairness. 
* 
---------------------------------------------------------------------- 
File        : GUIRealloc.C 
Purpose     : Dynamic memory management 
---------------------------------------------------------------------- 
*/ 
 
#include            /* needed for definition of NULL */ 
#include            /* for memcpy, memset */ 
 
#include "GUI_Protected.h" 
#include "GUIDebug.h" 
 
/********************************************************************* 
* 
*       Public routines: Using internal memory management 
* 
********************************************************************** 
*/ 
/********************************************************************* 
* 
*       GUI_ALLOC_Realloc 
* 
* Purpose: 
*   Reallocate a memory block. This is typically used to grow memory 
*   blocks. The contents of the old memory block are copied into the 
*   new block (or as much as fits in case of shrinkage). 
*   In case of error the old memory block (and its handle) remain 
*   unchanged. 
* 
* Return value: 
*   On success:    Handle of newly allocated memory block 
*   On error:      0 
*/ 
GUI_HMEM GUI_ALLOC_Realloc(GUI_HMEM hOld, int NewSize) { 
  GUI_HMEM hNew; 
  hNew = GUI_ALLOC_AllocNoInit(NewSize); 
  if (hNew && hOld) { 
    void *pNew, *pOld; 
    int Size, OldSize; 
    OldSize = GUI_ALLOC_GetSize(hOld); 
    Size = (OldSize < NewSize) ? OldSize : NewSize; 
    GUI_LOCK(); 
    pNew = GUI_ALLOC_h2p(hNew); 
    pOld = GUI_ALLOC_h2p(hOld); 
    memcpy(pNew, pOld, Size); 
    GUI_UNLOCK(); 
    GUI_ALLOC_Free(hOld); 
  } 
  return hNew; 
} 
 
/*************************** End of file ****************************/