39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
/*
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* Copyright (c) 2011, 2012, 2013, 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* string/memmove.c
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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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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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