diff --git a/ap/libc/glibc/glibc-2.23/string/argz-stringify.c b/ap/libc/glibc/glibc-2.23/string/argz-stringify.c
new file mode 100644
index 0000000..254b7c5
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/string/argz-stringify.c
@@ -0,0 +1,40 @@
+/* Routines for dealing with '\0' separated arg vectors.
+   Copyright (C) 1995-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Written by Miles Bader <miles@gnu.org>
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <argz.h>
+#include <string.h>
+
+/* Make '\0' separated arg vector ARGZ printable by converting all the '\0's
+   except the last into the character SEP.  */
+void
+__argz_stringify (char *argz, size_t len, int sep)
+{
+  if (len > 0)
+    while (1)
+      {
+	size_t part_len = __strnlen (argz, len);
+	argz += part_len;
+	len -= part_len;
+	if (len-- <= 1)		/* includes final '\0' we want to stop at */
+	  break;
+	*argz++ = sep;
+      }
+}
+libc_hidden_def (__argz_stringify)
+weak_alias (__argz_stringify, argz_stringify)