diff --git a/ap/libc/glibc/glibc-2.23/misc/err.c b/ap/libc/glibc/glibc-2.23/misc/err.c
new file mode 100644
index 0000000..3067835
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/misc/err.c
@@ -0,0 +1,179 @@
+/* 4.4BSD utility functions for error messages.
+   Copyright (C) 1995-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 <stdarg.h>
+#include <err.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <wchar.h>
+#define flockfile(s) _IO_flockfile (s)
+#define funlockfile(s) _IO_funlockfile (s)
+
+extern char *__progname;
+
+#define VA(call)							      \
+{									      \
+  va_list ap;								      \
+  va_start (ap, format);						      \
+  call;									      \
+  va_end (ap);								      \
+}
+
+static void
+convert_and_print (const char *format, __gnuc_va_list ap)
+{
+#define ALLOCA_LIMIT	2000
+  size_t len;
+  wchar_t *wformat = NULL;
+  mbstate_t st;
+  size_t res;
+  const char *tmp;
+
+  if (format == NULL)
+    return;
+
+  len = strlen (format) + 1;
+
+  do
+    {
+      if (len < ALLOCA_LIMIT)
+	wformat = (wchar_t *) alloca (len * sizeof (wchar_t));
+      else
+	{
+	  if (wformat != NULL && len / 2 < ALLOCA_LIMIT)
+	    wformat = NULL;
+
+	  wformat = (wchar_t *) realloc (wformat, len * sizeof (wchar_t));
+
+	  if (wformat == NULL)
+	    {
+	      fputws_unlocked (L"out of memory\n", stderr);
+	      return;
+	    }
+	}
+
+      memset (&st, '\0', sizeof (st));
+      tmp =format;
+    }
+  while ((res = __mbsrtowcs (wformat, &tmp, len, &st)) == len);
+
+  if (res == (size_t) -1)
+    /* The string cannot be converted.  */
+    wformat = (wchar_t *) L"???";
+
+  __vfwprintf (stderr, wformat, ap);
+}
+
+void
+vwarnx (const char *format, __gnuc_va_list ap)
+{
+  flockfile (stderr);
+  if (_IO_fwide (stderr, 0) > 0)
+    {
+      __fwprintf (stderr, L"%s: ", __progname);
+      convert_and_print (format, ap);
+      putwc_unlocked (L'\n', stderr);
+    }
+  else
+    {
+      fprintf (stderr, "%s: ", __progname);
+      if (format)
+	vfprintf (stderr, format, ap);
+      putc_unlocked ('\n', stderr);
+    }
+  funlockfile (stderr);
+}
+libc_hidden_def (vwarnx)
+
+void
+vwarn (const char *format, __gnuc_va_list ap)
+{
+  int error = errno;
+
+  flockfile (stderr);
+  if (_IO_fwide (stderr, 0) > 0)
+    {
+      __fwprintf (stderr, L"%s: ", __progname);
+      if (format)
+	{
+	  convert_and_print (format, ap);
+	  fputws_unlocked (L": ", stderr);
+	}
+      __set_errno (error);
+      __fwprintf (stderr, L"%m\n");
+    }
+  else
+    {
+      fprintf (stderr, "%s: ", __progname);
+      if (format)
+	{
+	  vfprintf (stderr, format, ap);
+	  fputs_unlocked (": ", stderr);
+	}
+      __set_errno (error);
+      fprintf (stderr, "%m\n");
+    }
+  funlockfile (stderr);
+}
+libc_hidden_def (vwarn)
+
+
+void
+warn (const char *format, ...)
+{
+  VA (vwarn (format, ap))
+}
+libc_hidden_def (warn)
+
+void
+warnx (const char *format, ...)
+{
+  VA (vwarnx (format, ap))
+}
+libc_hidden_def (warnx)
+
+void
+verr (int status, const char *format, __gnuc_va_list ap)
+{
+  vwarn (format, ap);
+  exit (status);
+}
+libc_hidden_def (verr)
+
+void
+verrx (int status, const char *format, __gnuc_va_list ap)
+{
+  vwarnx (format, ap);
+  exit (status);
+}
+libc_hidden_def (verrx)
+
+void
+err (int status, const char *format, ...)
+{
+  VA (verr (status, format, ap))
+}
+
+void
+errx (int status, const char *format, ...)
+{
+  VA (verrx (status, format, ap))
+}