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sortix--sortix/libc/string/memmove.cpp
2014-12-02 18:23:42 +01:00

43 lines
1.5 KiB
C++

/*******************************************************************************
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013, 2014.
This file is part of the Sortix C Library.
The Sortix C Library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
The Sortix C Library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
License for more details.
You should have received a copy of the GNU Lesser General Public License
along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
string/memmove.cpp
Copy memory between potentionally overlapping regions.
*******************************************************************************/
#include <stdint.h>
#include <string.h>
extern "C" void* memmove(void* dest_ptr, const void* src_ptr, size_t n)
{
unsigned char* dest = (unsigned char*) dest_ptr;
const unsigned char* src = (const unsigned char*) src_ptr;
if ( (uintptr_t) dest < (uintptr_t) src )
{
for ( size_t i = 0; i < n; i++ )
dest[i] = src[i];
}
else
{
for ( size_t i = 0; i < n; i++ )
dest[n-(i+1)] = src[n-(i+1)];
}
return dest_ptr;
}