1  long long unsigned
       2  str2llu (str)
       3       char *str;
       4  {
       5    long long unsigned acc;
       6    long long b = 10;
       7    char d;
       8    acc =  *str++ - '0';
       9    for (;;)
      10      {
      11        d = *str++;
      12        if (d == '\0')
      13  	break;
      14        d -= '0';
      15        acc = acc * 10 + d;
      16      }
      17  
      18    return acc;
      19  }