tests/test-fopen.h

   1 /* Test of opening a file stream.
   2    Copyright (C) 2007-2024 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 }