# HG changeset patch
# User Jim Meyering <jim@meyering.net>
# Date 983646336 0
# Node ID 45ae29380da9dfd36897e35d6c377165b5fcc4df
# Parent  30bf9f67db352ebf9b82ca9dcff384b0e1695c98
from Paul Eggert

diff --git a/lib/dup-safer.c b/lib/dup-safer.c
new file mode 100644
--- /dev/null
+++ b/lib/dup-safer.c
@@ -0,0 +1,62 @@
+/* Invoke dup, but avoid some glitches.
+   Copyright (C) 2001 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* Written by Paul Eggert.  */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+
+#if HAVE_FCNTL_H
+# include <fcntl.h>
+#endif
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+#ifndef STDERR_FILENO
+# define STDERR_FILENO 2
+#endif
+
+#include <unistd-safer.h>
+
+/* Like dup, but do not return STDIN_FILENO, STDOUT_FILENO, or
+   STDERR_FILENO.  */
+
+int
+dup_safer (int fd)
+{
+#ifdef F_DUPFD
+  return fcntl (fd, F_DUPFD, STDERR_FILENO + 1);
+#else
+  int f = dup (fd);
+  if (0 <= f && f <= STDERR_FILENO)
+    {
+      int f1 = dup_safer (f);
+      int e = errno;
+      close (f);
+      errno = e;
+      f = f1;
+    }
+  return f;
+#endif
+}
diff --git a/lib/fopen-safer.c b/lib/fopen-safer.c
new file mode 100644
--- /dev/null
+++ b/lib/fopen-safer.c
@@ -0,0 +1,76 @@
+/* Invoke fopen, but avoid some glitches.
+   Copyright (C) 2001 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+/* Written by Paul Eggert.  */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+#include <unistd-safer.h>
+
+#ifndef STDERR_FILENO
+# define STDERR_FILENO 2
+#endif
+
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+
+#include <stdio.h>
+#include <stdio-safer.h>
+
+/* Like fopen, but do not return stdin, stdout, or stderr.  */
+
+FILE *
+fopen_safer (char const *file, char const *mode)
+{
+  FILE *fp = fopen (file, mode);
+
+  if (fp)
+    {
+      int fd = fileno (fp);
+
+      if (0 <= fd && fd <= STDERR_FILENO)
+	{
+	  int f = dup_safer (fd);
+
+	  if (f < 0)
+	    {
+	      int e = errno;
+	      fclose (fp);
+	      errno = e;
+	      return NULL;
+	    }
+
+	  if (fclose (fp) != 0
+	      || ! (fp = fdopen (f, mode)))
+	    {
+	      int e = errno;
+	      close (f);
+	      errno = e;
+	      return NULL;
+	    }
+	}
+    }
+
+  return fp;
+}
diff --git a/lib/stdio-safer.h b/lib/stdio-safer.h
new file mode 100644
--- /dev/null
+++ b/lib/stdio-safer.h
@@ -0,0 +1,9 @@
+#ifndef PARAMS
+# if defined PROTOTYPES || (defined __STDC__ && __STDC__)
+#  define PARAMS(Args) Args
+# else
+#  define PARAMS(Args) ()
+# endif
+#endif
+
+FILE *fopen_safer PARAMS ((char const *, char const *));
diff --git a/lib/unistd-safer.h b/lib/unistd-safer.h
new file mode 100644
--- /dev/null
+++ b/lib/unistd-safer.h
@@ -0,0 +1,9 @@
+#ifndef PARAMS
+# if defined PROTOTYPES || (defined __STDC__ && __STDC__)
+#  define PARAMS(Args) Args
+# else
+#  define PARAMS(Args) ()
+# endif
+#endif
+
+int dup_safer PARAMS ((int));