--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgfortran/intrinsics/rename.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,96 @@
+/* Implementation of the RENAME intrinsic.
+   Copyright (C) 2005-2017 Free Software Foundation, Inc.
+   Contributed by François-Xavier Coudert <coudert@clipper.ens.fr>
+
+This file is part of the GNU Fortran runtime library (libgfortran).
+
+Libgfortran 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.
+
+Libgfortran 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.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include "libgfortran.h"
+
+#include <errno.h>
+
+
+static int
+rename_internal (char *path1, char *path2, gfc_charlen_type path1_len,
+		 gfc_charlen_type path2_len)
+{
+  char *str1 = fc_strdup (path1, path1_len);
+  char *str2 = fc_strdup (path2, path2_len);
+  int val = rename (str1, str2);
+  free (str1);
+  free (str2);
+  return ((val == 0) ? 0 : errno);
+}
+
+
+/* SUBROUTINE RENAME(PATH1, PATH2, STATUS)
+   CHARACTER(len=*), INTENT(IN) :: PATH1, PATH2
+   INTEGER, INTENT(OUT), OPTIONAL :: STATUS  */
+
+extern void rename_i4_sub (char *, char *, GFC_INTEGER_4 *, gfc_charlen_type,
+	                   gfc_charlen_type);
+iexport_proto(rename_i4_sub);
+
+void
+rename_i4_sub (char *path1, char *path2, GFC_INTEGER_4 *status,
+	       gfc_charlen_type path1_len, gfc_charlen_type path2_len)
+{
+  int val = rename_internal (path1, path2, path1_len, path2_len);
+  if (status != NULL) 
+    *status = val;
+}
+iexport(rename_i4_sub);
+
+extern void rename_i8_sub (char *, char *, GFC_INTEGER_8 *, gfc_charlen_type,
+	                   gfc_charlen_type);
+iexport_proto(rename_i8_sub);
+
+void
+rename_i8_sub (char *path1, char *path2, GFC_INTEGER_8 *status,
+	       gfc_charlen_type path1_len, gfc_charlen_type path2_len)
+{
+  int val = rename_internal (path1, path2, path1_len, path2_len);
+  if (status != NULL) 
+    *status = val;
+}
+iexport(rename_i8_sub);
+
+extern GFC_INTEGER_4 rename_i4 (char *, char *, gfc_charlen_type,
+	                        gfc_charlen_type);
+export_proto(rename_i4);
+
+GFC_INTEGER_4
+rename_i4 (char *path1, char *path2, gfc_charlen_type path1_len,
+	   gfc_charlen_type path2_len)
+{
+  return rename_internal (path1, path2, path1_len, path2_len);
+}
+
+extern GFC_INTEGER_8 rename_i8 (char *, char *, gfc_charlen_type,
+	                        gfc_charlen_type);
+export_proto(rename_i8);
+
+GFC_INTEGER_8
+rename_i8 (char *path1, char *path2, gfc_charlen_type path1_len,
+	   gfc_charlen_type path2_len)
+{
+  return rename_internal (path1, path2, path1_len, path2_len);
+}