text: /* Test of execution of program termination handlers.
     Copyright (C) 2007-2016 Free Software Foundation, Inc.
  
     This program 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.
  
     This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
  
  /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
  
  #include <config.h>
  
  #include <stdlib.h>
  
  #include "signature.h"
  SIGNATURE_CHECK (realpath, char *, (const char *, char *));
  SIGNATURE_CHECK (canonicalize_file_name, char *, (const char *));
  
  #include <errno.h>
  #include <fcntl.h>
  #include <stdio.h>
  #include <string.h>
  #include <sys/stat.h>
  #include <unistd.h>
  
  #include "same-inode.h"
  #include "ignore-value.h"
  #include "macros.h"
  
  #define BASE "t-can-lgpl.tmp"
  
  static void *
  null_ptr (void)
  {
    return NULL;
  }
  
  int
  main (void)
  {
  #if GNULIB_TEST_CANONICALIZE
    /* No need to test canonicalize-lgpl module if canonicalize is also
       in use.  */
    return 0;
  #endif
  
    /* Setup some hierarchy to be used by this test.  Start by removing
       any leftovers from a previous partial run.  */
    {
      int fd;
      ignore_value (system ("rm -rf " BASE " ise"));
      ASSERT (mkdir (BASE, 0700) == 0);
      fd = creat (BASE "/tra", 0600);
      ASSERT (0 <= fd);
      ASSERT (close (fd) == 0);
    }
  
    /* Check for ., .., intermediate // handling, and for error cases.  */
    {
      char *result = canonicalize_file_name (BASE "//./..//" BASE "/tra");
      ASSERT (result != NULL);
      ASSERT (strstr (result, "/" BASE "/tra")
              == result + strlen (result) - strlen ("/" BASE "/tra"));
      free (result);
      errno = 0;
      result = canonicalize_file_name ("");
      ASSERT (result == NULL);
      ASSERT (errno == ENOENT);
      errno = 0;
      result = canonicalize_file_name (null_ptr ());
      ASSERT (result == NULL);
      ASSERT (errno == EINVAL);
    }
  
    /* Check that a non-directory with trailing slash yields NULL.  */
    {
      char *result;
      errno = 0;
      result = canonicalize_file_name (BASE "/tra/");
      ASSERT (result == NULL);
      ASSERT (errno == ENOTDIR);
    }
  
    /* Check that a missing directory yields NULL.  */
    {
      char *result;
      errno = 0;
      result = canonicalize_file_name (BASE "/zzz/..");
      ASSERT (result == NULL);
      ASSERT (errno == ENOENT);
    }
  
    /* From here on out, tests involve symlinks.  */
    if (symlink (BASE "/ket", "ise") != 0)
      {
        ASSERT (remove (BASE "/tra") == 0);
        ASSERT (rmdir (BASE) == 0);
        fputs ("skipping test: symlinks not supported on this file system\n",
               stderr);
        return 77;
      }
    ASSERT (symlink ("bef", BASE "/plo") == 0);
    ASSERT (symlink ("tra", BASE "/huk") == 0);
    ASSERT (symlink ("lum", BASE "/bef") == 0);
    ASSERT (symlink ("wum", BASE "/ouk") == 0);
    ASSERT (symlink ("../ise", BASE "/ket") == 0);
    ASSERT (mkdir (BASE "/lum", 0700) == 0);
    ASSERT (symlink ("//.//../..", BASE "/droot") == 0);
  
    /* Check that the symbolic link to a file can be resolved.  */
    {
      char *result1 = canonicalize_file_name (BASE "/huk");
      char *result2 = canonicalize_file_name (BASE "/tra");
      ASSERT (result1 != NULL);
      ASSERT (result2 != NULL);
      ASSERT (strcmp (result1, result2) == 0);
      ASSERT (strcmp (result1 + strlen (result1) - strlen ("/" BASE "/tra"),
                      "/" BASE "/tra") == 0);
      free (result1);
      free (result2);
    }
  
    /* Check that the symbolic link to a directory can be resolved.  */
    {
      char *result1 = canonicalize_file_name (BASE "/plo");
      char *result2 = canonicalize_file_name (BASE "/bef");
      char *result3 = canonicalize_file_name (BASE "/lum");
      ASSERT (result1 != NULL);
      ASSERT (result2 != NULL);
      ASSERT (result3 != NULL);
      ASSERT (strcmp (result1, result2) == 0);
      ASSERT (strcmp (result2, result3) == 0);
      ASSERT (strcmp (result1 + strlen (result1) - strlen ("/" BASE "/lum"),
                      "/" BASE "/lum") == 0);
      free (result1);
      free (result2);
      free (result3);
    }
  
    /* Check that a symbolic link to a nonexistent file yields NULL.  */
    {
      char *result;
      errno = 0;
      result = canonicalize_file_name (BASE "/ouk");
      ASSERT (result == NULL);
      ASSERT (errno == ENOENT);
    }
  
    /* Check that a non-directory symlink with trailing slash yields NULL.  */
    {
      char *result;
      errno = 0;
      result = canonicalize_file_name (BASE "/huk/");
      ASSERT (result == NULL);
      ASSERT (errno == ENOTDIR);
    }
  
    /* Check that a missing directory via symlink yields NULL.  */
    {
      char *result;
      errno = 0;
      result = canonicalize_file_name (BASE "/ouk/..");
      ASSERT (result == NULL);
      ASSERT (errno == ENOENT);
    }
  
    /* Check that a loop of symbolic links is detected.  */
    {
      char *result;
      errno = 0;
      result = canonicalize_file_name ("ise");
      ASSERT (result == NULL);
      ASSERT (errno == ELOOP);
    }
  
    /* Check that leading // is honored correctly.  */
    {
      struct stat st1;
      struct stat st2;
      char *result1 = canonicalize_file_name ("//.");
      char *result2 = canonicalize_file_name (BASE "/droot");
      ASSERT (result1);
      ASSERT (result2);
      ASSERT (stat ("/", &st1) == 0);
      ASSERT (stat ("//", &st2) == 0);
      /* On IBM z/OS, "/" and "//" are distinct, yet they both have
         st_dev == st_ino == 1.  */
  #ifndef __MVS__
      if (SAME_INODE (st1, st2))
        {
          ASSERT (strcmp (result1, "/") == 0);
          ASSERT (strcmp (result2, "/") == 0);
        }
      else
  #endif
        {
          ASSERT (strcmp (result1, "//") == 0);
          ASSERT (strcmp (result2, "//") == 0);
        }
      free (result1);
      free (result2);
    }
  
  
    /* Cleanup.  */
    ASSERT (remove (BASE "/droot") == 0);
    ASSERT (remove (BASE "/plo") == 0);
    ASSERT (remove (BASE "/huk") == 0);
    ASSERT (remove (BASE "/bef") == 0);
    ASSERT (remove (BASE "/ouk") == 0);
    ASSERT (remove (BASE "/ket") == 0);
    ASSERT (remove (BASE "/lum") == 0);
    ASSERT (remove (BASE "/tra") == 0);
    ASSERT (remove (BASE) == 0);
    ASSERT (remove ("ise") == 0);
  
    return 0;
  }
  