在嵌入式里，资源非常紧张，假如采用ADS编译器自带的C库，程序会增加100k字节；一般一些常用的函数都是自己编写 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开发论坛

void memcpy
(
void *_pDst, /* [out] 存放拷贝数据的缓存地址*/
void *_pSrc, /* [in] 原数据缓存地址 */
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 ;
}