+#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);