87 lines
2.2 KiB
C++
87 lines
2.2 KiB
C++
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#include "precomp.h"
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// In debug mode, we link with CRT, so we don't need this!
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#ifndef _DEBUG
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/***
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*memmove.c - contains memmove routine
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*
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* Copyright (c) 1988-1997, Microsoft Corporation. All right reserved.
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*
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*Purpose:
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* memmove() copies a source memory buffer to a destination buffer.
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* Overlapping buffers are treated specially, to avoid propogation.
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*
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*******************************************************************************/
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#if defined (_M_ALPHA)
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#pragma function(memmove)
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#endif /* defined (_M_ALPHA) */
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/***
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*memmove - Copy source buffer to destination buffer
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*
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*Purpose:
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* memmove() copies a source memory buffer to a destination memory buffer.
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* This routine recognize overlapping buffers to avoid propogation.
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* For cases where propogation is not a problem, memcpy() can be used.
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*
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*Entry:
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* void *dst = pointer to destination buffer
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* const void *src = pointer to source buffer
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* size_t count = number of bytes to copy
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*
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*Exit:
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* Returns a pointer to the destination buffer
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*
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*Exceptions:
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*******************************************************************************/
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void * __cdecl memmove (
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void * dst,
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const void * src,
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size_t count
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)
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{
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void * ret = dst;
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#if defined (_M_MRX000) || defined (_M_ALPHA) || defined (_M_PPC)
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{
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extern void RtlMoveMemory( void *, const void *, size_t count );
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RtlMoveMemory( dst, src, count );
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}
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#else /* defined (_M_MRX000) || defined (_M_ALPHA) || defined (_M_PPC) */
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if (dst <= src || (char *)dst >= ((char *)src + count)) {
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/*
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* Non-Overlapping Buffers
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* copy from lower addresses to higher addresses
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*/
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while (count--) {
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*(char *)dst = *(char *)src;
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dst = (char *)dst + 1;
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src = (char *)src + 1;
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}
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}
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else {
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/*
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* Overlapping Buffers
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* copy from higher addresses to lower addresses
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*/
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dst = (char *)dst + count - 1;
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src = (char *)src + count - 1;
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while (count--) {
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*(char *)dst = *(char *)src;
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dst = (char *)dst - 1;
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src = (char *)src - 1;
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}
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}
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#endif /* defined (_M_MRX000) || defined (_M_ALPHA) || defined (_M_PPC) */
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return(ret);
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}
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#endif // !_DEBUG
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