102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/*
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*********************************************************************************************************
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* uC/GUI
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* Universal graphic software for embedded applications
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*
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* (c) Copyright 2002, Micrium Inc., Weston, FL
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* (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
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*
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* µC/GUI is protected by international copyright laws. Knowledge of the
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* source code may not be used to write a similar product. This file may
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* only be used in accordance with a license and should not be redistributed
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* in any way. We appreciate your understanding and fairness.
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*
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----------------------------------------------------------------------
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File : WM_UserData.c
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Purpose : Implementation of WM_xxxUserData
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----------------------------------------------------------------------
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*/
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#include "WM_Intern.h"
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#include <string.h> /* for memcpy, memset */
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#if GUI_WINSUPPORT /* If 0, WM will not generate any code */
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/*********************************************************************
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*
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* Static code
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*
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**********************************************************************
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*/
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/*********************************************************************
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*
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* _Min
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*/
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static int Min(int v0, int v1) {
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return (v0 < v1) ? v0 : v1;
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}
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/*********************************************************************
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*
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* _CalcNumBytes
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*/
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static int _CalcNumBytes(WM_HWIN hWin, int NumBytes) {
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return Min(GUI_ALLOC_GetSize(hWin) - sizeof(WM_Obj), NumBytes);
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}
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/*********************************************************************
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*
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* Public code
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*
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**********************************************************************
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*/
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/*********************************************************************
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*
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* WM_GetUserData
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*
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* Purpose
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* Get the User data (extra bytes) associated with a window
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* These bytes have typically been set using WM_SetUserData first.
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* (If not, they are 0)
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* Return value:
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* Number of bytes fetched. (<= SizeofBuffer)
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*/
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int WM_GetUserData(WM_HWIN hWin, void* pDest, int NumBytes) {
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if (hWin) {
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WM_Obj *pWin;
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NumBytes = _CalcNumBytes(hWin, NumBytes);
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WM_LOCK();
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pWin = WM_H2P(hWin);
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memcpy(pDest, pWin + 1, NumBytes);
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WM_UNLOCK();
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}
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return NumBytes;
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}
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/*********************************************************************
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*
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* WM_SetUserData
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*
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* Purpose
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* Set the User data (extra bytes) associated with a window
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* Return value:
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* Number of bytes fetched. (<= SizeofBuffer)
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*/
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int WM_SetUserData(WM_HWIN hWin, const void* pSrc, int NumBytes) {
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if (hWin) {
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WM_Obj *pWin;
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NumBytes = _CalcNumBytes(hWin, NumBytes);
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WM_LOCK();
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pWin = WM_H2P(hWin);
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memcpy(pWin + 1, pSrc, NumBytes);
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WM_UNLOCK();
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}
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return NumBytes;
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}
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#else
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void WM_UserData_C(void) {} /* avoid empty object files */
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#endif
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/*************************** End of file ****************************/
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