diff --git a/ap/libc/glibc/glibc-2.23/string/test-memset.c b/ap/libc/glibc/glibc-2.23/string/test-memset.c
new file mode 100644
index 0000000..fee3bdf
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/string/test-memset.c
@@ -0,0 +1,259 @@
+/* Test memset functions.
+   Copyright (C) 1999-2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Written by Jakub Jelinek <jakub@redhat.com>, 1999.
+
+   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/>.  */
+
+#define TEST_MAIN
+#ifdef TEST_BZERO
+# define TEST_NAME "bzero"
+#else
+# ifndef WIDE
+#  define TEST_NAME "memset"
+# else
+#  define TEST_NAME "wmemset"
+# endif /* WIDE */
+#endif /* !TEST_BZERO */
+#define MIN_PAGE_SIZE 131072
+#include "test-string.h"
+
+#ifndef WIDE
+# define MEMSET memset
+# define CHAR char
+# define UCHAR unsigned char
+# define SIMPLE_MEMSET simple_memset
+# define MEMCMP memcmp
+# define BIG_CHAR CHAR_MAX
+#else
+# include <wchar.h>
+# define MEMSET wmemset
+# define CHAR wchar_t
+# define UCHAR wchar_t
+# define SIMPLE_MEMSET simple_wmemset
+# define MEMCMP wmemcmp
+# define BIG_CHAR WCHAR_MAX
+#endif /* WIDE */
+
+CHAR *SIMPLE_MEMSET (CHAR *, int, size_t);
+
+#ifdef TEST_BZERO
+typedef void (*proto_t) (char *, size_t);
+void simple_bzero (char *, size_t);
+void builtin_bzero (char *, size_t);
+
+IMPL (simple_bzero, 0)
+IMPL (builtin_bzero, 0)
+IMPL (bzero, 1)
+
+void
+simple_bzero (char *s, size_t n)
+{
+  SIMPLE_MEMSET (s, 0, n);
+}
+
+void
+builtin_bzero (char *s, size_t n)
+{
+  __builtin_bzero (s, n);
+}
+#else
+typedef CHAR *(*proto_t) (CHAR *, int, size_t);
+
+IMPL (SIMPLE_MEMSET, 0)
+# ifndef WIDE
+char *builtin_memset (char *, int, size_t);
+IMPL (builtin_memset, 0)
+# endif /* !WIDE */
+IMPL (MEMSET, 1)
+
+# ifndef WIDE
+char *
+builtin_memset (char *s, int c, size_t n)
+{
+  return __builtin_memset (s, c, n);
+}
+# endif /* !WIDE */
+#endif /* !TEST_BZERO */
+
+CHAR *
+inhibit_loop_to_libcall
+SIMPLE_MEMSET (CHAR *s, int c, size_t n)
+{
+  CHAR *r = s, *end = s + n;
+  while (r < end)
+    *r++ = c;
+  return s;
+}
+
+static void
+do_one_test (impl_t *impl, CHAR *s, int c __attribute ((unused)), size_t n)
+{
+  CHAR tstbuf[n];
+#ifdef TEST_BZERO
+  simple_bzero (tstbuf, n);
+  CALL (impl, s, n);
+  if (memcmp (s, tstbuf, n) != 0)
+#else
+  CHAR *res = CALL (impl, s, c, n);
+  if (res != s
+      || SIMPLE_MEMSET (tstbuf, c, n) != tstbuf
+      || MEMCMP (s, tstbuf, n) != 0)
+#endif /* !TEST_BZERO */
+    {
+      error (0, 0, "Wrong result in function %s", impl->name);
+      ret = 1;
+      return;
+    }
+}
+
+static void
+do_test (size_t align, int c, size_t len)
+{
+  align &= 7;
+  if ((align + len) * sizeof (CHAR) > page_size)
+    return;
+
+  FOR_EACH_IMPL (impl, 0)
+    do_one_test (impl, (CHAR *) (buf1) + align, c, len);
+}
+
+#ifndef TEST_BZERO
+static void
+do_random_tests (void)
+{
+  size_t i, j, k, n, align, len, size;
+  int c, o;
+  UCHAR *p, *res;
+  UCHAR *p2 = (UCHAR *) buf2;
+
+  for (i = 0; i < 65536 / sizeof (CHAR); ++i)
+    p2[i] = random () & BIG_CHAR;
+
+  for (n = 0; n < ITERATIONS; n++)
+    {
+      if ((random () & 31) == 0)
+	size = 65536 / sizeof (CHAR);
+      else
+	size = 512;
+      p = (UCHAR *) (buf1 + page_size) - size;
+      len = random () & (size - 1);
+      align = size - len - (random () & 31);
+      if (align > size)
+	align = size - len;
+      if ((random () & 7) == 0)
+	align &= ~63;
+      if ((random () & 7) == 0)
+	c = 0;
+      else
+	c = random () & BIG_CHAR;
+      o = random () & BIG_CHAR;
+      if (o == c)
+	o = (c + 1) & BIG_CHAR;
+      j = len + align + 128;
+      if (j > size)
+	j = size;
+      if (align >= 128)
+	k = align - 128;
+      else
+	k = 0;
+      for (i = k; i < align; ++i)
+	p[i] = o;
+      for (i = align + len; i < j; ++i)
+	p[i] = o;
+
+      FOR_EACH_IMPL (impl, 1)
+	{
+	  for (i = 0; i < len; ++i)
+	    {
+	      p[i + align] = p2[i];
+	      if (p[i + align] == c)
+		p[i + align] = o;
+	    }
+	  res = (UCHAR *) CALL (impl, (CHAR *) p + align, c, len);
+	  if (res != p + align)
+	    {
+	      error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %d, %zd) %p != %p",
+		     n, impl->name, align, c, len, res, p + align);
+	      ret = 1;
+	    }
+	  for (i = k; i < align; ++i)
+	    if (p[i] != o)
+	      {
+		error (0, 0, "Iteration %zd - garbage before %s (%zd, %d, %zd)",
+		       n, impl->name, align, c, len);
+		ret = 1;
+		break;
+	      }
+	  for (; i < align + len; ++i)
+	    if (p[i] != c)
+	      {
+		error (0, 0, "Iteration %zd - not cleared correctly %s (%zd, %d, %zd)",
+		       n, impl->name, align, c, len);
+		ret = 1;
+		break;
+	      }
+	  for (; i < j; ++i)
+	    if (p[i] != o)
+	      {
+		error (0, 0, "Iteration %zd - garbage after %s (%zd, %d, %zd)",
+		       n, impl->name, align, c, len);
+		ret = 1;
+		break;
+	      }
+	}
+    }
+}
+#endif /* !TEST_BZERO */
+
+int
+test_main (void)
+{
+  size_t i;
+  int c = 0;
+
+  test_init ();
+
+  printf ("%24s", "");
+  FOR_EACH_IMPL (impl, 0)
+    printf ("\t%s", impl->name);
+  putchar ('\n');
+
+#ifndef TEST_BZERO
+  for (c = -65; c <= 130; c += 65)
+#endif
+    {
+      for (i = 0; i < 18; ++i)
+	do_test (0, c, 1 << i);
+      for (i = 1; i < 32; ++i)
+	{
+	  do_test (i, c, i);
+	  if (i & (i - 1))
+	    do_test (0, c, i);
+	}
+      do_test (1, c, 14);
+      do_test (3, c, 1024);
+      do_test (4, c, 64);
+      do_test (2, c, 25);
+    }
+
+#ifndef TEST_BZERO
+  do_random_tests ();
+#endif
+
+  return ret;
+}
+
+#include "../test-skeleton.c"