1  #include <stdio.h>
       2  #include <stdlib.h>
       3  #include <tst-stack-align.h>
       4  
       5  struct big { char c[4 * 1024]; };
       6  
       7  struct big *array;
       8  struct big *array_end;
       9  
      10  static int align_check;
      11  
      12  int
      13  compare (void const *a1, void const *b1)
      14  {
      15    struct big const *a = a1;
      16    struct big const *b = b1;
      17  
      18    if (!align_check)
      19      align_check = TEST_STACK_ALIGN () ? -1 : 1;
      20  
      21    if (! (array <= a && a < array_end
      22  	 && array <= b && b < array_end))
      23      {
      24        exit (EXIT_FAILURE);
      25      }
      26    return b->c[0] - a->c[0];
      27  }
      28  
      29  int
      30  main (int argc, char **argv)
      31  {
      32    size_t i;
      33    size_t array_members = argv[1] ? atoi (argv[1]) : 50;
      34    array = (struct big *) malloc (array_members * sizeof *array);
      35    if (array == NULL)
      36      {
      37        puts ("no memory");
      38        exit (EXIT_FAILURE);
      39      }
      40  
      41    array_end = array + array_members;
      42    for (i = 0; i < array_members; i++)
      43      array[i].c[0] = i % 128;
      44  
      45    qsort (array, array_members, sizeof *array, compare);
      46  
      47    if (align_check == -1)
      48      {
      49        puts ("stack not sufficiently aligned");
      50        exit (EXIT_FAILURE);
      51      }
      52  
      53    return 0;
      54  }