1  /* Test of opening a file stream.
       2     Copyright (C) 2007-2023 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  /* Tell GCC not to warn about the specific edge cases tested here.  */
      27  #if __GNUC__ >= 10
      28  # pragma GCC diagnostic ignored "-Wanalyzer-file-leak"
      29  #endif
      30  
      31  /* Test fopen.  Assumes BASE is defined.  */
      32  
      33  static int
      34  test_fopen (void)
      35  {
      36    FILE *f;
      37    /* Remove anything from prior partial run.  */
      38    unlink (BASE "file");
      39  
      40    /* Read requires existing file.  */
      41    errno = 0;
      42    ASSERT (fopen (BASE "file", "r") == NULL);
      43    ASSERT (errno == ENOENT);
      44  
      45    /* Write can create a file.  */
      46    f = fopen (BASE "file", "w");
      47    ASSERT (f);
      48    ASSERT (fclose (f) == 0);
      49  
      50    /* Trailing slash is invalid on non-directory.  */
      51    errno = 0;
      52    ASSERT (fopen (BASE "file/", "r") == NULL);
      53    ASSERT (errno == ENOTDIR || errno == EISDIR || errno == EINVAL);
      54  
      55    errno = 0;
      56    ASSERT (fopen (BASE "file/", "r+") == NULL);
      57    ASSERT (errno == ENOTDIR || errno == EISDIR || errno == EINVAL);
      58  
      59    /* Cannot create a directory.  */
      60    errno = 0;
      61    ASSERT (fopen ("nonexist.ent/", "w") == NULL);
      62    ASSERT (errno == ENOTDIR || errno == EISDIR || errno == ENOENT
      63            || errno == EINVAL);
      64  
      65    /* Directories cannot be opened for writing.  */
      66    errno = 0;
      67    ASSERT (fopen (".", "w") == NULL);
      68    ASSERT (errno == EISDIR || errno == EINVAL || errno == EACCES);
      69  
      70    errno = 0;
      71    ASSERT (fopen ("./", "w") == NULL);
      72    ASSERT (errno == EISDIR || errno == EINVAL || errno == EACCES);
      73  
      74    errno = 0;
      75    ASSERT (fopen (".", "r+") == NULL);
      76    ASSERT (errno == EISDIR || errno == EINVAL || errno == EACCES);
      77  
      78    errno = 0;
      79    ASSERT (fopen ("./", "r+") == NULL);
      80    ASSERT (errno == EISDIR || errno == EINVAL || errno == EACCES);
      81  
      82    /* /dev/null must exist, and be writable.  */
      83    f = fopen ("/dev/null", "r");
      84    ASSERT (f);
      85    ASSERT (fclose (f) == 0);
      86    f = fopen ("/dev/null", "w");
      87    ASSERT (f);
      88    ASSERT (fclose (f) == 0);
      89  
      90    /* Cleanup.  */
      91    ASSERT (unlink (BASE "file") == 0);
      92  
      93    return 0;
      94  }