gui__memset16.c

MCB2300_ucgui_LCD320240.rar LPC2368的uc/gui的移植

/*
*********************************************************************************************************
*   											 uC/GUI
*   					 Universal graphic software for embedded applications
*
*   					(c) Copyright 2002, Micrium Inc., Weston, FL
*   					(c) Copyright 2002, SEGGER Microcontroller Systeme GmbH
*
*   		   礐/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		: GUI__memset16.c
Purpose 	: Implementation of said function
---------------------------END-OF-HEADER------------------------------
*/

#include <stddef.h> 		  /* needed for definition of NULL */
#include "GUI_Protected.h"

/*********************************************************************
*
*   	public code
*
**********************************************************************
*/
/*********************************************************************
*
*   	GUI__memset
*
* Purpose:
*  Equivalent to the memset function, for 16 bit Data.
*/
void GUI__memset16(U16 *p, U16 Fill, int NumWords)
{
	/* Code for 16 bit CPUs */
	if (sizeof(int) == 2)
	{
		/* May some compilers generate a warning at this line: Condition is alwaws true/false */
		if (NumWords >= 8)
		{
			/* May some compilers generate a warning at this line: Unreachable code */
			*p++ = Fill;
			*p++ = Fill;
			*p++ = Fill;
			*p++ = Fill;
			*p++ = Fill;
			*p++ = Fill;
			*p++ = Fill;
			*p++ = Fill;
			NumWords -= 8;
		}
		while (NumWords)
		{
			*p++ = Fill;
			NumWords--;
		}
	}
	else
	{
		int NumInts;		  /* May some compilers generate a warning at this line: Unreachable code */
		/* Write 16 bit until we are done or have reached an int boundary */
		if (2 & (U32) p)
		{
			*p++ = Fill;
			NumWords--;
		}
		/* Write Ints */
		NumInts = (unsigned) NumWords / (sizeof(int) / 2);
		if (NumInts)
		{
			int FillInt;
			int *pInt;
			FillInt = Fill * 0x10001;

			pInt = (int *) p;
			/* Fill large amount of data at a time */
			if (NumInts >= 4)
			{
				do
				{
					*pInt = FillInt;
					*(pInt + 1) = FillInt;
					*(pInt + 2) = FillInt;
					*(pInt + 3) = FillInt;
					pInt += 4;
				}
				while ((NumInts -= 4) >= 4);
			}
			/* Fill one int at a time */
			while (NumInts)
			{
				*pInt++ = FillInt;
				NumInts--;
			}
			p = (U16 *) pInt;
		}
		/* Fill the remainder */
		if (NumWords & 1)
		{
			*p = Fill;
		}
	}
}

/*************************** End of file ****************************/