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