gui__memset.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__memset.c
Purpose 	: Implementation of said function
---------------------------END-OF-HEADER------------------------------
*/

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

/*********************************************************************
*
*   	public code
*
**********************************************************************
*/
/*********************************************************************
*
*   	GUI__memset
*
* Purpose:
*  Replacement for the memset function. The advantage is high speed
*  on all systems (sometime up to 10 times as fast as the one
*  in the library)
*  Main idea is to write int-wise.
*/
void GUI__memset(U8 *p, U8 Fill, int NumBytes)
{
	int NumInts;
	/* Write bytes until we are done or have reached an int boundary */
	while (NumBytes && ((sizeof(int) - 1) & (U32) p))
	{
		*p++ = Fill;
		NumBytes--;
	}
	/* Write Ints */
	NumInts = (unsigned) NumBytes / sizeof(int);
	if (NumInts)
	{
		int FillInt;
		int *pInt;
		NumBytes &= (sizeof(int) - 1);
		if (sizeof(int) == 2)
		{
			/* May some compilers generate a warning at this line: Condition is alwaws true/false */
			FillInt = Fill * 0x101; 	 /* May some compilers generate a warning at this line: Unreachable code */
		}
		else if (sizeof(int) == 4)
		{
			/* May some compilers generate a warning at this line: Condition is alwaws true/false */
			FillInt = Fill * 0x1010101;  /* May some compilers generate a warning at this line: Unreachable code */
		}
		pInt = (int *) p;
		/* Fill large amount of data at a time */
		while (NumInts >= 4)
		{
			*pInt++ = FillInt;
			*pInt++ = FillInt;
			*pInt++ = FillInt;
			*pInt++ = FillInt;
			NumInts -= 4;
		}
		/* Fill one int at a time */
		while (NumInts)
		{
			*pInt++ = FillInt;
			NumInts--;
		}
		p = (U8 *) pInt;
	}
	/* Fill the remainder byte wise */
	while (NumBytes)
	{
		*p++ = Fill;
		NumBytes--;
	}
}

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