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/*
* FreeRTOS Kernel V10.4.0
* Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* http://www.FreeRTOS.org
* http://aws.amazon.com/freertos
*
* 1 tab == 4 spaces!
*/
/*
* The library functions not provided by libgcc for freestanding environments.
* The implementation of the functions in this file have made NO attempt
* whatsoever to be optimised!
*/
#warning The functions in this file are very basic, and not optimised.
#include <stddef.h>
/*-----------------------------------------------------------*/
void *memcpy( void *pvDest, const void *pvSource, size_t xBytes )
{
/* The compiler used during development seems to err unless these volatiles are
included at -O3 optimisation. */
volatile unsigned char *pcDest = ( volatile unsigned char * ) pvDest, *pcSource = ( volatile unsigned char * ) pvSource;
size_t x;
/* Extremely crude standard library implementations in lieu of having a C
library. */
if( pvDest != pvSource )
{
for( x = 0; x < xBytes; x++ )
{
pcDest[ x ] = pcSource[ x ];
}
}
return pvDest;
}
/*-----------------------------------------------------------*/
void *memset( void *pvDest, int iValue, size_t xBytes )
{
/* The compiler used during development seems to err unless these volatiles are
included at -O3 optimisation. */
volatile unsigned char * volatile pcDest = ( volatile unsigned char * volatile ) pvDest;
volatile size_t x;
/* Extremely crude standard library implementations in lieu of having a C
library. */
for( x = 0; x < xBytes; x++ )
{
pcDest[ x ] = ( unsigned char ) iValue;
}
return pvDest;
}
/*-----------------------------------------------------------*/
int memcmp( const void *pvMem1, const void *pvMem2, unsigned long ulBytes )
{
const volatile unsigned char *pucMem1 = pvMem1, *pucMem2 = pvMem2;
register unsigned long x;
/* Extremely crude standard library implementations in lieu of having a C
library. */
for( x = 0; x < ulBytes; x++ )
{
if( pucMem1[ x ] != pucMem2[ x ] )
{
break;
}
}
return ulBytes - x;
}
/*-----------------------------------------------------------*/
int strcmp( const char *pcString1, const char *pcString2 )
{
volatile int iReturn, iIndex = 0;
/* Extremely crude standard library implementations in lieu of having a C
library. */
while( ( pcString1[ iIndex ] != 0x00 ) && ( pcString2[ iIndex ] != 0x00 ) )
{
iIndex++;
}
if( ( pcString1[ iIndex ] == 0x00 ) && ( pcString2[ iIndex ] == 0x00 ) )
{
iReturn = 0;
}
else
{
iReturn = ~0;
}
return iReturn;
}
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