stdlib/tst-qsort6.c

   1 /* Test qsort with invalid comparison functions.
   2    Copyright (C) 2023-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <array_length.h>
  20 #include <stdlib.h>
  21 #include <support/check.h>
  22
  23 /* Invalid comparison function that always returns -1.  */
  24 static int
  25 invalid_compare_1 (const void *a1, const void *b1)
  26 {
  27   const int *a = a1;
  28   const int *b = b1;
  29   /* Check that the marker value matches, which means that we are
  30      likely within the array.  */
  31   TEST_COMPARE (*a, 842523635);
  32   TEST_COMPARE (*b, 842523635);
  33   TEST_VERIFY_EXIT (*a == 842523635);
  34   TEST_VERIFY_EXIT (*b == 842523635);
  35   return -1;
  36 }
  37
  38 /* Invalid comparison function that always returns 1.  */
  39 static int
  40 invalid_compare_2 (const void *a1, const void *b1)
  41 {
  42   const int *a = a1;
  43   const int *b = b1;
  44   TEST_COMPARE (*a, 842523635);
  45   TEST_COMPARE (*b, 842523635);
  46   TEST_VERIFY_EXIT (*a == 842523635);
  47   TEST_VERIFY_EXIT (*b == 842523635);
  48   return 1;
  49 }
  50
  51 static int
  52 do_test (void)
  53 {
  54   int array[] = {842523635, 842523635, 842523635, 842523635, 842523635};
  55   qsort (array, array_length (array), sizeof (array[0]), invalid_compare_1);
  56   qsort (array, array_length (array), sizeof (array[0]), invalid_compare_2);
  57   return 0;
  58 }
  59
  60 #include <support/test-driver.c>