function strLen(char* str)
{
  uses Ebx Ecx;
  Ebx = str;
  Ecx = Ebx;
  while(char[Ecx] != 0)
   {
     Ecx++;
   }
  int32 len = Ecx - Ebx;  // hope this expression will be supported to make life more easy
  return len;
}