在嵌入式里，資源非常緊張，假如采用ADS編譯器自帶的C庫，程序會增加100k字節(jié)；一般一些常用的函數(shù)都是自己編寫 typedef unsigned char UINT1;
typedef unsigned short UINT2;
typedef unsigned int UINT4;
typedef signed char INT1;
typedef signed short INT2;
typedef signed int INT4; M開發(fā)論壇

void memcpy
(
void *_pDst, /* [out] 存放拷貝數(shù)據(jù)的緩存地址*/
void *_pSrc, /* [in] 原數(shù)據(jù)緩存地址 */
INT4 iNum
)
{
INT4 i;
UINT1 *ucdst, *ucsrc; http://www.armforum.cn

if(_pDst < _pSrc)
{
ucdst = (UINT1 *)_pDst;
ucsrc = (UINT1 *)_pSrc;
for (i = 0; i < iNum; i )
{
*ucdst = *ucsrc ;
}
}
else
{
ucdst = (UINT1 *)_pDst (iNum - 1);
ucsrc = (UINT1 *)_pSrc (iNum - 1);
for(i = 0; i < iNum; i )
{
*ucdst-- = *ucsrc--;
}
}
return ;
}