98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
/***
|
|
*memcpy.c - contains memcpy routine
|
|
*
|
|
* Copyright (c) 1988-2001, Microsoft Corporation. All rights reserved.
|
|
*
|
|
*Purpose:
|
|
* memcpy() copies a source memory buffer to a destination buffer.
|
|
* Overlapping buffers are not treated specially, so propogation may occur.
|
|
*
|
|
*Revision History:
|
|
* 05-31-89 JCR C version created.
|
|
* 02-27-90 GJF Fixed calling type, #include <cruntime.h>, fixed
|
|
* copyright.
|
|
* 10-01-90 GJF New-style function declarator. Also, rewrote expr. to
|
|
* avoid using cast as an lvalue.
|
|
* 04-01-91 SRW Add #pragma function for i386 _WIN32_ and _CRUISER_
|
|
* builds
|
|
* 04-05-91 GJF Speed up for large buffers by moving int-sized chunks
|
|
* as much as possible.
|
|
* 08-06-91 GJF Backed out 04-05-91 change. Pointers would have to be
|
|
* dword-aligned for this to work on MIPS.
|
|
* 07-16-93 SRW ALPHA Merge
|
|
* 09-01-93 GJF Merged NT SDK and Cuda versions.
|
|
* 11-12-93 GJF Replace _MIPS_ and _ALPHA_ with _M_MRX000 and
|
|
* _M_ALPHA (resp.).
|
|
* 12-03-93 GJF Turn on #pragma function for all MS front-ends (esp.,
|
|
* Alpha compiler).
|
|
* 10-02-94 BWT Add PPC support.
|
|
* 10-07-97 RDL Added IA64.
|
|
*
|
|
*******************************************************************************/
|
|
|
|
#include <cruntime.h>
|
|
#include <string.h>
|
|
|
|
#ifdef _MSC_VER
|
|
#pragma function(memcpy)
|
|
#endif
|
|
|
|
/***
|
|
*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_IA64) || defined(_M_AMD64)
|
|
|
|
{
|
|
|
|
#if !defined(LIBCNTPR)
|
|
|
|
__declspec(dllimport)
|
|
|
|
#endif
|
|
|
|
void RtlCopyMemory( void *, const void *, size_t count );
|
|
|
|
RtlCopyMemory( dst, src, count );
|
|
|
|
}
|
|
|
|
#else
|
|
/*
|
|
* copy from lower addresses to higher addresses
|
|
*/
|
|
while (count--) {
|
|
*(char *)dst = *(char *)src;
|
|
dst = (char *)dst + 1;
|
|
src = (char *)src + 1;
|
|
}
|
|
#endif
|
|
|
|
return(ret);
|
|
}
|