if (buf[26] != '\xff') { puts ("asctime_r overwrote 27th byte in buffer"); result = 1; }
do_test (void){  int result = 0;  time_t t = time (NULL);  struct tm *tp = localtime (&t);  tp->tm_year = 10000 - 1900;  char buf[1000];  errno = 0;  char *s = asctime_r (tp, buf);  if (s != NULL || errno != EOVERFLOW)    {      puts ("asctime_r did not fail correctly");      result = 1;    }  return result;}