1 /* Open a stream to a file.
2 Copyright (C) 2007-2008 Free Software Foundation, Inc.
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.
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.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 /* Written by Bruno Haible <bruno@clisp.org>, 2007. */
30 rpl_fopen (const char *filename, const char *mode)
33 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
34 if (strcmp (filename, "/dev/null") == 0)
38 #if FOPEN_TRAILING_SLASH_BUG
39 /* If the filename ends in a slash and a mode that requires write access is
41 Rationale: POSIX <http://www.opengroup.org/susv3/basedefs/xbd_chap04.html>
43 "A pathname that contains at least one non-slash character and that
44 ends with one or more trailing slashes shall be resolved as if a
45 single dot character ( '.' ) were appended to the pathname."
47 "The special filename dot shall refer to the directory specified by
49 If the named file already exists as a directory, then if a mode that
50 requires write access is specified, fopen() must fail because POSIX
51 <http://www.opengroup.org/susv3/functions/fopen.html> says that it
52 fails with errno = EISDIR in this case.
53 If the named file does not exist or does not name a directory, then
54 fopen() must fail since the file does not contain a '.' directory. */
56 size_t len = strlen (filename);
57 if (len > 0 && filename[len - 1] == '/')
63 if (mode[0] == 'w' || mode[0] == 'a')
69 fd = open (filename, O_RDONLY);
73 if (fstat (fd, &statbuf) >= 0 && !S_ISDIR (statbuf.st_mode))
80 fp = fdopen (fd, mode);
83 int saved_errno = errno;
92 return fopen (filename, mode);