memcpy 與 memmove 實現

void* Memcpy(void *p, void *p1,size_t count)
{
    assert(p && p1); 
    char *pDest = static_cast<char*>(p);
 char *pSrt = static_cast<char*>(p1);

 while(count--)
 {
  *pDest++ = *pSrt++ ;
 }
 

 return pDest;
}

void *Memmove(void *Dst, const void*Src,size_t count)
{
 assert(Dst && Src);
 void* pDst = Dst;

 if (Dst<Src && (char*)Dst > (char*)Src + count)
 {
  while(count--)
  {
   *(char*)Dst = *(char*)Src;
   Dst = (char*)Dst + 1;
   Src = (char*)Src + 1;
  }
 }
 else
 {
      Dst = (char*)Dst + count - 1;
   Src = (char*)Src + count - 1;
   while(count--)
   {
      *(char*)Dst = *(char*)Src;
      Dst = (char*)Dst -1 ;
      Src = (char*)Src -1 ;
   }
 }

 return pDst;
}