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 2, or (at your option)
8   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, write to the Free Software Foundation,
17   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
18
19/* Written by Paul Eggert.  */
20
21#include <config.h>
22
23#include "fcntl-safer.h"
24
25#include <fcntl.h>
26#include <stdarg.h>
27#include "unistd-safer.h"
28
29int
30open_safer (char const *file, int flags, ...)
31{
32  mode_t mode = 0;
33
34  if (flags & O_CREAT)
35    {
36      va_list ap;
37      va_start (ap, flags);
38
39      /* Assume mode_t promotes to int if and only if it is smaller.
40	 This assumption isn't guaranteed by the C standard, but we
41	 don't know of any real-world counterexamples.  */
42      mode = (sizeof (mode_t) < sizeof (int)
43	      ? va_arg (ap, int)
44	      : va_arg (ap, mode_t));
45
46      va_end (ap);
47    }
48
49  return fd_safer (open (file, flags, mode));
50}
51