67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/***
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*memcpy.c - contains memcpy 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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* memcpy() copies a source memory buffer to a destination buffer.
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* Overlapping buffers are not treated specially, so propogation may occur.
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*
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*******************************************************************************/
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//#include <cruntime.h>
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#include <string.h>
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#ifdef _MSC_VER
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#pragma function(memcpy)
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#endif /* _MSC_VER */
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/***
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*memcpy - Copy source buffer to destination buffer
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*
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*Purpose:
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* memcpy() copies a source memory buffer to a destination memory buffer.
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* This routine does NOT recognize overlapping buffers, and thus can lead
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* to propogation.
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*
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* For cases where propogation must be avoided, memmove() must 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 memcpy (
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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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/*
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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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#endif /* defined (_M_MRX000) || defined (_M_ALPHA) || defined (_M_PPC) */
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return(ret);
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}
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