Imported Upstream version 1.3.9

[debian/gzip] / lib / open-safer.c

diff --git a/lib/open-safer.c b/lib/open-safer.c
new file mode 100644 (file)
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--- /dev/null
+++ b/lib/open-safer.c
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+/* Invoke open, but avoid some glitches.
+
+   Copyright (C) 2005, 2006 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 2, 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.  */
+
+/* Written by Paul Eggert.  */
+
+#include <config.h>
+
+#include "fcntl-safer.h"
+
+#include <fcntl.h>
+#include <stdarg.h>
+#include "unistd-safer.h"
+
+int
+open_safer (char const *file, int flags, ...)
+{
+  mode_t mode = 0;
+
+  if (flags & O_CREAT)
+    {
+      va_list ap;
+      va_start (ap, flags);
+
+      /* Assume mode_t promotes to int if and only if it is smaller.
+        This assumption isn't guaranteed by the C standard, but we
+        don't know of any real-world counterexamples.  */
+      mode = (sizeof (mode_t) < sizeof (int)
+             ? va_arg (ap, int)
+             : va_arg (ap, mode_t));
+
+      va_end (ap);
+    }
+
+  return fd_safer (open (file, flags, mode));
+}