+
−/* Open a stream to a file.
+
−   Copyright (C) 2007-2013 Free Software Foundation, Inc.
+
−
+
−   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 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, 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>
+
−
+
−/* Get the original definition of fopen.  It might be defined as a macro.  */
+
−#include <stdio.h>
+
−#undef __need_FILE
+
−
+
−static 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 *
+
−rpl_fopen (const char *filename, const char *mode)
+
−{
+
−#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+
−  if (strcmp (filename, "/dev/null") == 0)
+
−    filename = "NUL";
+
−#endif
+
−
+
−#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);
+
−}