1  /* Test of opening a file stream.
       2     Copyright (C) 2007-2022 Free Software Foundation, Inc.
       3  
       4     This program is free software: you can redistribute it and/or modify
       5     it under the terms of the GNU General Public License as published by
       6     the Free Software Foundation, either version 3 of the License, or
       7     (at your option) any later version.
       8  
       9     This program is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      12     GNU General Public License for more details.
      13  
      14     You should have received a copy of the GNU General Public License
      15     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
      16  
      17  /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
      18  
      19  /* Include <config.h> and a form of <stdio.h> first.  */
      20  
      21  #include <errno.h>
      22  #include <unistd.h>
      23  
      24  #include "macros.h"
      25  
      26  /* Test fopen.  Assumes BASE is defined.  */
      27  
      28  static int
      29  test_fopen (void)
      30  {
      31    FILE *f;
      32    /* Remove anything from prior partial run.  */
      33    unlink (BASE "file");
      34  
      35    /* Read requires existing file.  */
      36    errno = 0;
      37    ASSERT (fopen (BASE "file", "r") == NULL);
      38    ASSERT (errno == ENOENT);
      39  
      40    /* Write can create a file.  */
      41    f = fopen (BASE "file", "w");
      42    ASSERT (f);
      43    ASSERT (fclose (f) == 0);
      44  
      45    /* Trailing slash is invalid on non-directory.  */
      46    errno = 0;
      47    ASSERT (fopen (BASE "file/", "r") == NULL);
      48    ASSERT (errno == ENOTDIR || errno == EISDIR || errno == EINVAL);
      49  
      50    errno = 0;
      51    ASSERT (fopen (BASE "file/", "r+") == NULL);
      52    ASSERT (errno == ENOTDIR || errno == EISDIR || errno == EINVAL);
      53  
      54    /* Cannot create a directory.  */
      55    errno = 0;
      56    ASSERT (fopen ("nonexist.ent/", "w") == NULL);
      57    ASSERT (errno == ENOTDIR || errno == EISDIR || errno == ENOENT
      58            || errno == EINVAL);
      59  
      60    /* Directories cannot be opened for writing.  */
      61    errno = 0;
      62    ASSERT (fopen (".", "w") == NULL);
      63    ASSERT (errno == EISDIR || errno == EINVAL || errno == EACCES);
      64  
      65    errno = 0;
      66    ASSERT (fopen ("./", "w") == NULL);
      67    ASSERT (errno == EISDIR || errno == EINVAL || errno == EACCES);
      68  
      69    errno = 0;
      70    ASSERT (fopen (".", "r+") == NULL);
      71    ASSERT (errno == EISDIR || errno == EINVAL || errno == EACCES);
      72  
      73    errno = 0;
      74    ASSERT (fopen ("./", "r+") == NULL);
      75    ASSERT (errno == EISDIR || errno == EINVAL || errno == EACCES);
      76  
      77    /* /dev/null must exist, and be writable.  */
      78    f = fopen ("/dev/null", "r");
      79    ASSERT (f);
      80    ASSERT (fclose (f) == 0);
      81    f = fopen ("/dev/null", "w");
      82    ASSERT (f);
      83    ASSERT (fclose (f) == 0);
      84  
      85    /* Cleanup.  */
      86    ASSERT (unlink (BASE "file") == 0);
      87  
      88    return 0;
      89  }