#include <signal.h> /* for signal */
#include <string.h> /* for strstr */
#include <stdlib.h> /* for malloc */
#include <unistd.h> /* for alarm */
static void quit (int sig) { exit (sig + 128); }

int
main ()
{

    int result = 0;
    size_t m = 1000000;
    char *haystack = (char *) malloc (2 * m + 2);
    char *needle = (char *) malloc (m + 2);
    /* Failure to compile this test due to missing alarm is okay,
       since all such platforms (mingw) also have quadratic strstr.  */
    signal (SIGALRM, quit);
    alarm (5);
    /* Check for quadratic performance.  */
    if (haystack && needle)
      {
        memset (haystack, 'A', 2 * m);
        haystack[2 * m] = 'B';
        haystack[2 * m + 1] = 0;
        memset (needle, 'A', m);
        needle[m] = 'B';
        needle[m + 1] = 0;
        if (!strstr (haystack, needle))
          result |= 1;
      }
    return result;

  ;
  return 0;
}