67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
|
/***
|
||
|
|
*memcpy.c - contains memcpy routine
|
||
|
|
*
|
||
|
|
* Copyright (c) 1988-1997, Microsoft Corporation. All right reserved.
|
||
|
|
*
|
||
|
|
*Purpose:
|
||
|
|
* memcpy() copies a source memory buffer to a destination buffer.
|
||
|
|
* Overlapping buffers are not treated specially, so propogation may occur.
|
||
|
|
*
|
||
|
|
*******************************************************************************/
|
||
|
|
|
||
|
|
//#include <cruntime.h>
|
||
|
|
#include <string.h>
|
||
|
|
|
||
|
|
#ifdef _MSC_VER
|
||
|
|
#pragma function(memcpy)
|
||
|
|
#endif /* _MSC_VER */
|
||
|
|
|
||
|
|
/***
|
||
|
|
*memcpy - Copy source buffer to destination buffer
|
||
|
|
*
|
||
|
|
*Purpose:
|
||
|
|
* memcpy() copies a source memory buffer to a destination memory buffer.
|
||
|
|
* This routine does NOT recognize overlapping buffers, and thus can lead
|
||
|
|
* to propogation.
|
||
|
|
*
|
||
|
|
* For cases where propogation must be avoided, memmove() must be used.
|
||
|
|
*
|
||
|
|
*Entry:
|
||
|
|
* void *dst = pointer to destination buffer
|
||
|
|
* const void *src = pointer to source buffer
|
||
|
|
* size_t count = number of bytes to copy
|
||
|
|
*
|
||
|
|
*Exit:
|
||
|
|
* Returns a pointer to the destination buffer
|
||
|
|
*
|
||
|
|
*Exceptions:
|
||
|
|
*******************************************************************************/
|
||
|
|
|
||
|
|
void * __cdecl memcpy (
|
||
|
|
void * dst,
|
||
|
|
const void * src,
|
||
|
|
size_t count
|
||
|
|
)
|
||
|
|
{
|
||
|
|
void * ret = dst;
|
||
|
|
|
||
|
|
#if defined (_M_MRX000) || defined (_M_ALPHA) || defined (_M_PPC)
|
||
|
|
{
|
||
|
|
extern void RtlMoveMemory( void *, const void *, size_t count );
|
||
|
|
|
||
|
|
RtlMoveMemory( dst, src, count );
|
||
|
|
}
|
||
|
|
#else /* defined (_M_MRX000) || defined (_M_ALPHA) || defined (_M_PPC) */
|
||
|
|
/*
|
||
|
|
* copy from lower addresses to higher addresses
|
||
|
|
*/
|
||
|
|
while (count--) {
|
||
|
|
*(char *)dst = *(char *)src;
|
||
|
|
dst = (char *)dst + 1;
|
||
|
|
src = (char *)src + 1;
|
||
|
|
}
|
||
|
|
#endif /* defined (_M_MRX000) || defined (_M_ALPHA) || defined (_M_PPC) */
|
||
|
|
|
||
|
|
return(ret);
|
||
|
|
}
|