C语言实现strcpy和memcpy

char* strcpy(char* pDest, const char* pSrc){    assert((pDest != NULL) && (pSrc != NULL));    char *pTmp = pDest;    while ((*pDest++ = *pSrc++) != '\0');    return pTmp;}

void* memcpy(void* pvTo, const void* pvForm, size_t size){    assert((pvTo!= NULL) && (pvFrom!= NULL));       //使用断言防止传递空地址    unsigned char* pbTo = (unsigned char*)pvTo;     //防止改变pvTo的地址    unsigned char* pbFrom = (unsigned char*)pvFrom; //防止改变pvFrom的地址    while(size-- > 0)    {        *pbTo++ = *pbFrom++;    }    return pvTo;}