1  extern void exit (int);
       2  extern void abort (void);
       3  
       4  volatile int i;
       5  unsigned char *volatile cp;
       6  unsigned char d[32] = { 0 };
       7  
       8  int
       9  main (void)
      10  {
      11    unsigned char c[32] = { 0 };
      12    unsigned char *p = d + i;
      13    int j;
      14    for (j = 0; j < 30; j++)
      15      {
      16        int x = 0xff;
      17        int y = *++p;
      18        switch (j)
      19  	{
      20  	case 1: x ^= 2; break;
      21  	case 2: x ^= 4; break;
      22  	case 25: x ^= 1; break;
      23  	default: break;
      24  	}
      25        c[j] = y | x;
      26        cp = p;
      27      }
      28    if (c[0] != 0xff
      29        || c[1] != 0xfd
      30        || c[2] != 0xfb
      31        || c[3] != 0xff
      32        || c[4] != 0xff
      33        || c[25] != 0xfe
      34        || cp != d + 30)
      35      abort ();
      36    exit (0);
      37  }