/* Open a stream to a file.
- Copyright (C) 2007 Free Software Foundation, Inc.
+ Copyright (C) 2007-2011 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ 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 2, or (at your option)
- any later version.
+ 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, write to the Free Software Foundation,
- Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
+ 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. */
+/* If the user's config.h happens to include <stdio.h>, let it include only
+ the system's <stdio.h> here, so that orig_fopen doesn't recurse to
+ rpl_fopen. */
+#define __need_FILE
#include <config.h>
-/* Specification. */
+/* Get the original definition of fopen. It might be defined as a macro. */
#include <stdio.h>
+#undef __need_FILE
+
+static inline FILE *
+orig_fopen (const char *filename, const char *mode)
+{
+ return fopen (filename, mode);
+}
+
+/* Specification. */
+/* Write "stdio.h" here, not <stdio.h>, otherwise OSF/1 5.1 DTK cc eliminates
+ this include because of the preliminary #include <stdio.h> above. */
+#include "stdio.h"
+#include <errno.h>
+#include <fcntl.h>
#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
FILE *
-fopen (const char *filename, const char *mode)
-#undef fopen
+rpl_fopen (const char *filename, const char *mode)
{
#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
if (strcmp (filename, "/dev/null") == 0)
filename = "NUL";
#endif
- return fopen (filename, mode);
+#if FOPEN_TRAILING_SLASH_BUG
+ /* If the filename ends in a slash and a mode that requires write access is
+ specified, then fail.
+ Rationale: POSIX <http://www.opengroup.org/susv3/basedefs/xbd_chap04.html>
+ says that
+ "A pathname that contains at least one non-slash character and that
+ ends with one or more trailing slashes shall be resolved as if a
+ single dot character ( '.' ) were appended to the pathname."
+ and
+ "The special filename dot shall refer to the directory specified by
+ its predecessor."
+ If the named file already exists as a directory, then if a mode that
+ requires write access is specified, fopen() must fail because POSIX
+ <http://www.opengroup.org/susv3/functions/fopen.html> says that it
+ fails with errno = EISDIR in this case.
+ If the named file does not exist or does not name a directory, then
+ fopen() must fail since the file does not contain a '.' directory. */
+ {
+ size_t len = strlen (filename);
+ if (len > 0 && filename[len - 1] == '/')
+ {
+ int fd;
+ struct stat statbuf;
+ FILE *fp;
+
+ if (mode[0] == 'w' || mode[0] == 'a')
+ {
+ errno = EISDIR;
+ return NULL;
+ }
+
+ fd = open (filename, O_RDONLY);
+ if (fd < 0)
+ return NULL;
+
+ if (fstat (fd, &statbuf) >= 0 && !S_ISDIR (statbuf.st_mode))
+ {
+ close (fd);
+ errno = ENOTDIR;
+ return NULL;
+ }
+
+ fp = fdopen (fd, mode);
+ if (fp == NULL)
+ {
+ int saved_errno = errno;
+ close (fd);
+ errno = saved_errno;
+ }
+ return fp;
+ }
+ }
+# endif
+
+ return orig_fopen (filename, mode);
}