tests/test-qsort_r.c

   1 /* Test qsort_r.
   2
   3    Copyright 2014-2024 Free Software Foundation, Inc.
   4
   5    This program is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation, either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program 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
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 /* Written by Paul Eggert.  */
  19
  20 #include <config.h>
  21
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 static int
  26 cmp (void const *va, void const *vb, void *varg)
  27 {
  28   char const *a = va;
  29   char const *b = vb;
  30   int *arg = varg;
  31   return (*a < *b ? -1 : *a > *b) * *arg;
  32 }
  33
  34 int
  35 main (void)
  36 {
  37   char buf[] = "thequickbrownfoxjumpedoverthelazydogs";
  38   int forward = 1;
  39   int reverse = -1;
  40   qsort_r (buf, sizeof buf - 1, 1, cmp, &forward);
  41   if (strcmp (buf, "abcddeeeefghhijklmnoooopqrrsttuuvwxyz") != 0)
  42     return 1;
  43   qsort_r (buf, sizeof buf - 1, 1, cmp, &reverse);
  44   if (strcmp (buf, "zyxwvuuttsrrqpoooonmlkjihhgfeeeeddcba") != 0)
  45     return 1;
  46   return 0;
  47 }