mes/scaffold/tests/81-qsort.c

/* -*-comment-start: "//";comment-end:""-*-
 * GNU Mes --- Maxwell Equations of Software
 * Copyright © 2017 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 *
 * This file is part of GNU Mes.
 *
 * GNU Mes is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or (at
 * your option) any later version.
 *
 * GNU Mes is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "30-test.i"
#include <string.h>


int
compare_int (void *a, void *b)
{
  eputs ("compare: "); eputs (itoa (*(int*)a)); eputs (" <? "); eputs (itoa (*(int*)b));
  eputs (" => "); eputs (itoa (*(int*)a - *(int*)b)); eputs ("\n");
  return *(int*)a - *(int*)b;
}

int
test ()
{
  int lst[6] = {0, 5, 4, 3, 2, -1};
  qsort (lst, 6, sizeof (int), compare_int);
  for (int i = 0; i < 6; i++)
    {
      eputs (itoa (i)); eputs (":"); eputs (itoa (lst[i])); eputs ("\n");
    }
  if (lst[0] != -1) return 1;
  if (lst[5] != 5) return 2;
  return 0;
}