strcpy_s的函数实现是啥？
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[解决办法]

/***
*strcpy_s.c - contains strcpy_s()
*
*   Copyright (c) Microsoft Corporation. All rights reserved.
*
*Purpose:
*   strcpy_s() copies one string onto another.
*
*******************************************************************************/

#include <string.h>
#include <internal_securecrt.h>

#define _FUNC_PROLOGUE
#define _FUNC_NAME strcpy_s
#define _CHAR char
#define _DEST _Dst
#define _SIZE _SizeInBytes
#define _SRC _Src

#include <tcscpy_s.inl>

/***
*tcscpy_s.inl - general implementation of _tcscpy_s
*
*       Copyright (c) Microsoft Corporation. All rights reserved.
*
*Purpose:
*       This file contains the general algorithm for strcpy_s and its variants.
*
****/

_FUNC_PROLOGUE
errno_t __cdecl _FUNC_NAME(_CHAR *_DEST, size_t _SIZE, const _CHAR *_SRC)
{
    _CHAR *p;
    size_t available;

    /* validation section */
    _VALIDATE_STRING(_DEST, _SIZE);
    _VALIDATE_POINTER_RESET_STRING(_SRC, _DEST, _SIZE);

    p = _DEST;
    available = _SIZE;
    while ((*p++ = *_SRC++) != 0 && --available > 0)
    {
    }

    if (available == 0)
    {
        _RESET_STRING(_DEST, _SIZE);
        _RETURN_BUFFER_TOO_SMALL(_DEST, _SIZE);
    }
    _FILL_STRING(_DEST, _SIZE, _SIZE - available + 1);
    _RETURN_NO_ERROR;
}