82 lines
2.9 KiB
C
82 lines
2.9 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 : GUI__memset.c
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Purpose : Implementation of said function
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---------------------------END-OF-HEADER------------------------------
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*/
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#include <stddef.h> /* needed for definition of NULL */
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#include <string.h> /* needed for definition of NULL */
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#include "GUI_Protected.h"
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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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* GUI__memset
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*
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* Purpose:
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* Replacement for the memset function. The advantage is high speed
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* on all systems (sometime up to 10 times as fast as the one
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* in the library)
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* Main idea is to write int-wise.
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*/
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void GUI__memset(U8* p, U8 Fill, int NumBytes) {
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int NumInts;
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/* Write bytes until we are done or have reached an int boundary */
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while (NumBytes && ((sizeof(int) - 1) & (U32)p)) {
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*p++ = Fill;
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NumBytes--;
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}
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/* Write Ints */
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NumInts = (unsigned)NumBytes / sizeof(int);
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if (NumInts) {
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int FillInt;
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int *pInt;
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NumBytes &= (sizeof(int) - 1);
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if (sizeof(int) == 2) { /* May some compilers generate a warning at this line: Condition is alwaws true/false */
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FillInt = Fill * 0x101; /* May some compilers generate a warning at this line: Unreachable code */
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} else if (sizeof(int) == 4) { /* May some compilers generate a warning at this line: Condition is alwaws true/false */
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FillInt = Fill * 0x1010101; /* May some compilers generate a warning at this line: Unreachable code */
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}
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pInt = (int*)p;
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/* Fill large amount of data at a time */
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while (NumInts >= 4) {
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*pInt++ = FillInt;
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*pInt++ = FillInt;
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*pInt++ = FillInt;
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*pInt++ = FillInt;
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NumInts -= 4;
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}
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/* Fill one int at a time */
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while (NumInts) {
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*pInt++ = FillInt;
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NumInts--;
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}
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p = (U8*)pInt;
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}
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/* Fill the remainder byte wise */
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while (NumBytes) {
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*p++ = Fill;
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NumBytes--;
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}
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}
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/*************************** End of file ****************************/
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