stdlib/tst-qsort.c

   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 }