1  /* Test for realpath/canonicalize function.
       2     Copyright (C) 1998-2023 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  }