1  static char *
       2  begfield (int tab, char *ptr, char *lim, int sword, int schar)
       3  {
       4    if (tab)
       5      {
       6        while (ptr < lim && sword--)
       7  	{
       8  	  while (ptr < lim && *ptr != tab)
       9  	    ++ptr;
      10  	  if (ptr < lim)
      11  	    ++ptr;
      12  	}
      13      }
      14    else
      15      {
      16        while (1)
      17  	;
      18      }
      19  
      20    if (ptr + schar <= lim)
      21      ptr += schar;
      22  
      23    return ptr;
      24  }
      25  
      26  main ()
      27  {
      28    char *s = ":ab";
      29    char *lim = s + 3;
      30    if (begfield (':', s, lim, 1, 1) != s + 2)
      31      abort ();
      32    exit (0);
      33  }