stdlib/test-canon2.c

   1 /* Test for realpath/canonicalize function.
   2    Copyright (C) 1998-2024 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <errno.h>
  20 #include <string.h>
  21
  22
  23 /* Prototype for our test function.  */
  24 extern void do_prepare (int argc, char *argv[]);
  25 extern int do_test (int argc, char *argv[]);
  26
  27 /* We have a preparation function.  */
  28 #define PREPARE do_prepare
  29
  30 #include <test-skeleton.c>
  31
  32 /* Name of the temporary files we create.  */
  33 char *name1;
  34 char *name2;
  35
  36 /* Preparation.  */
  37 void
  38 do_prepare (int argc, char *argv[])
  39 {
  40   size_t test_dir_len;
  41
  42   test_dir_len = strlen (test_dir);
  43
  44   /* Generate the circular symlinks.  */
  45   name1 = malloc (test_dir_len + sizeof ("/canonXXXXXX"));
  46   mempcpy (mempcpy (name1, test_dir, test_dir_len),
  47            "/canonXXXXXX", sizeof ("/canonXXXXXX"));
  48   name2 = strdup (name1);
  49
  50   add_temp_file (mktemp (name1));
  51   add_temp_file (mktemp (name2));
  52 }
  53
  54
  55 /* Run the test.  */
  56 int
  57 do_test (int argc, char *argv[])
  58 {
  59   char *canon;
  60
  61   printf ("create symlinks from %s to %s and vice versa\n", name1, name2);
  62   if (symlink (name1, name2) == -1
  63       || symlink (name2, name1) == -1)
  64     /* We cannot test this.  */
  65     return 0;
  66
  67   /* Call the function.  This is equivalent the using `realpath' but the
  68      function allocates the room for the result.  */
  69   errno = 0;
  70   canon = canonicalize_file_name (name1);
  71
  72   return canon != NULL || errno != ELOOP;
  73 }