mirror of https://gerrit.osmocom.org/simtrace2
240 lines
8.0 KiB
C
240 lines
8.0 KiB
C
/* ----------------------------------------------------------------------------
|
|
* ATMEL Microcontroller Software Support
|
|
* ----------------------------------------------------------------------------
|
|
* Copyright (c) 2008, Atmel Corporation
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* - Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the disclaimer below.
|
|
*
|
|
* Atmel's name may not be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
|
|
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
|
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
|
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
|
|
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
* ----------------------------------------------------------------------------
|
|
*/
|
|
|
|
//------------------------------------------------------------------------------
|
|
/// \unit
|
|
///
|
|
/// !Purpose
|
|
///
|
|
/// Implementation of several methods defined in string.h, for reducing the
|
|
/// memory footprint when using them (since the whole libc.o file gets included
|
|
/// even when using a single method).
|
|
///
|
|
/// !Usage
|
|
///
|
|
/// Add string.c to the list of files to compile for the project. This will
|
|
/// automatically replace standard libc methods by the custom ones.
|
|
//------------------------------------------------------------------------------
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Headers
|
|
//------------------------------------------------------------------------------
|
|
|
|
#include <string.h>
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Global Functions
|
|
//------------------------------------------------------------------------------
|
|
|
|
//------------------------------------------------------------------------------
|
|
/// Copies data from a source buffer into a destination buffer. The two buffers
|
|
/// must NOT overlap. Returns the destination buffer.
|
|
/// \param pDestination Destination buffer.
|
|
/// \param pSource Source buffer.
|
|
/// \param num Number of bytes to copy.
|
|
//------------------------------------------------------------------------------
|
|
void * memcpy(void *pDestination, const void *pSource, size_t num)
|
|
{
|
|
unsigned char *pByteDestination;
|
|
unsigned char *pByteSource;
|
|
unsigned int *pAlignedSource = (unsigned int *) pSource;
|
|
unsigned int *pAlignedDestination = (unsigned int *) pDestination;
|
|
|
|
// If num is more than 4 bytes, and both dest. and source are aligned,
|
|
// then copy dwords
|
|
if ((((unsigned int) pAlignedDestination & 0x3) == 0)
|
|
&& (((unsigned int) pAlignedSource & 0x3) == 0)
|
|
&& (num >= 4)) {
|
|
|
|
while (num >= 4) {
|
|
|
|
*pAlignedDestination++ = *pAlignedSource++;
|
|
num -= 4;
|
|
}
|
|
}
|
|
|
|
// Copy remaining bytes
|
|
pByteDestination = (unsigned char *) pAlignedDestination;
|
|
pByteSource = (unsigned char *) pAlignedSource;
|
|
while (num--) {
|
|
|
|
*pByteDestination++ = *pByteSource++;
|
|
}
|
|
|
|
return pDestination;
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
/// Fills a memory region with the given value. Returns a pointer to the
|
|
/// memory region.
|
|
/// \param pBuffer Pointer to the start of the memory region to fill
|
|
/// \param value Value to fill the region with
|
|
/// \param num Size to fill in bytes
|
|
//------------------------------------------------------------------------------
|
|
void * memset(void *pBuffer, int value, size_t num)
|
|
{
|
|
unsigned char *pByteDestination;
|
|
unsigned int *pAlignedDestination = (unsigned int *) pBuffer;
|
|
unsigned int alignedValue = (value << 24) | (value << 16) | (value << 8) | value;
|
|
|
|
// Set words if possible
|
|
if ((((unsigned int) pAlignedDestination & 0x3) == 0) && (num >= 4)) {
|
|
while (num >= 4) {
|
|
*pAlignedDestination++ = alignedValue;
|
|
num -= 4;
|
|
}
|
|
}
|
|
// Set remaining bytes
|
|
pByteDestination = (unsigned char *) pAlignedDestination;
|
|
while (num--) {
|
|
*pByteDestination++ = value;
|
|
}
|
|
return pBuffer;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
/// Search a character in the given string.
|
|
/// Returns a pointer to the character location.
|
|
/// \param pString Pointer to the start of the string to search.
|
|
/// \param character The character to find.
|
|
//-----------------------------------------------------------------------------
|
|
char * strchr(const char *pString, int character)
|
|
{
|
|
char * p = (char *)pString;
|
|
char c = character & 0xFF;
|
|
|
|
while(*p != c) {
|
|
if (*p == 0) {
|
|
return 0;
|
|
}
|
|
p++;
|
|
}
|
|
return p;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
/// Return the length of a given string
|
|
/// \param pString Pointer to the start of the string.
|
|
//-----------------------------------------------------------------------------
|
|
size_t strlen(const char *pString)
|
|
{
|
|
unsigned int length = 0;
|
|
|
|
while(*pString++ != 0) {
|
|
length++;
|
|
}
|
|
return length;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
/// Search a character backword from the end of given string.
|
|
/// Returns a pointer to the character location.
|
|
/// \param pString Pointer to the start of the string to search.
|
|
/// \param character The character to find.
|
|
//-----------------------------------------------------------------------------
|
|
char * strrchr(const char *pString, int character)
|
|
{
|
|
char *p = 0;
|
|
|
|
while(*pString != 0) {
|
|
if (*pString++ == character) {
|
|
p = (char*)pString;
|
|
}
|
|
}
|
|
return p;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
/// Copy from source string to destination string
|
|
/// Return a pointer to the destination string
|
|
/// \param pDestination Pointer to the destination string.
|
|
/// \param pSource Pointer to the source string.
|
|
//-----------------------------------------------------------------------------
|
|
char * strcpy(char *pDestination, const char *pSource)
|
|
{
|
|
char *pSaveDest = pDestination;
|
|
|
|
for(; (*pDestination = *pSource) != 0; ++pSource, ++pDestination);
|
|
return pSaveDest;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
/// Compare the first specified bytes of 2 given strings
|
|
/// Return 0 if equals
|
|
/// Return >0 if 1st string > 2nd string
|
|
/// Return <0 if 1st string < 2nd string
|
|
/// \param pString1 Pointer to the start of the 1st string.
|
|
/// \param pString2 Pointer to the start of the 2nd string.
|
|
/// \param count Number of bytes that should be compared.
|
|
//-----------------------------------------------------------------------------
|
|
int strncmp(const char *pString1, const char *pString2, size_t count)
|
|
{
|
|
int r;
|
|
|
|
while(count) {
|
|
r = *pString1 - *pString2;
|
|
if (r == 0) {
|
|
if (*pString1 == 0) {
|
|
break;
|
|
}
|
|
pString1++;
|
|
pString2++;
|
|
count--;
|
|
continue;
|
|
}
|
|
return r;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
/// Copy the first number of bytes from source string to destination string
|
|
/// Return the pointer to the destination string.
|
|
/// \param pDestination Pointer to the start of destination string.
|
|
/// \param pSource Pointer to the start of the source string.
|
|
/// \param count Number of bytes that should be copied.
|
|
//-----------------------------------------------------------------------------
|
|
char * strncpy(char *pDestination, const char *pSource, size_t count)
|
|
{
|
|
char *pSaveDest = pDestination;
|
|
|
|
while (count) {
|
|
*pDestination = *pSource;
|
|
if (*pSource == 0) {
|
|
break;
|
|
}
|
|
pDestination++;
|
|
pSource++;
|
|
count--;
|
|
}
|
|
return pSaveDest;
|
|
}
|
|
|