1/* Invoke open, but avoid some glitches.
2
3   Copyright (C) 2005, 2006 Free Software Foundation, Inc.
4
5   This program is free software: you can redistribute it and/or modify
6   it under the terms of the GNU General Public License as published by
7   the Free Software Foundation; either version 3 of the License, or
8   (at your option) any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   GNU General Public License for more details.
14
15   You should have received a copy of the GNU General Public License
16   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17
18/* Written by Paul Eggert.  */
19
20#include <config.h>
21
22#include "fcntl-safer.h"
23
24#include <fcntl.h>
25#include <stdarg.h>
26#include "unistd-safer.h"
27
28int
29open_safer (char const *file, int flags, ...)
30{
31  mode_t mode = 0;
32
33  if (flags & O_CREAT)
34    {
35      va_list ap;
36      va_start (ap, flags);
37
38      /* Assume mode_t promotes to int if and only if it is smaller.
39	 This assumption isn't guaranteed by the C standard, but we
40	 don't know of any real-world counterexamples.  */
41      mode = (sizeof (mode_t) < sizeof (int)
42	      ? va_arg (ap, int)
43	      : va_arg (ap, mode_t));
44
45      va_end (ap);
46    }
47
48  return fd_safer (open (file, flags, mode));
49}
50