diff --git a/ap/libc/glibc/glibc-2.23/string/test-memcpy.c b/ap/libc/glibc/glibc-2.23/string/test-memcpy.c
new file mode 100644
index 0000000..2a0994c
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/string/test-memcpy.c
@@ -0,0 +1,253 @@
+/* Test and measure memcpy 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/>.  */
+
+#ifndef MEMCPY_RESULT
+# define MEMCPY_RESULT(dst, len) dst
+# define MIN_PAGE_SIZE 131072
+# define TEST_MAIN
+# define TEST_NAME "memcpy"
+# include "test-string.h"
+
+char *simple_memcpy (char *, const char *, size_t);
+char *builtin_memcpy (char *, const char *, size_t);
+
+IMPL (simple_memcpy, 0)
+IMPL (builtin_memcpy, 0)
+IMPL (memcpy, 1)
+
+char *
+simple_memcpy (char *dst, const char *src, size_t n)
+{
+  char *ret = dst;
+  while (n--)
+    *dst++ = *src++;
+  return ret;
+}
+
+char *
+builtin_memcpy (char *dst, const char *src, size_t n)
+{
+  return __builtin_memcpy (dst, src, n);
+}
+#endif
+
+typedef char *(*proto_t) (char *, const char *, size_t);
+
+static void
+do_one_test (impl_t *impl, char *dst, const char *src,
+	     size_t len)
+{
+  if (CALL (impl, dst, src, len) != MEMCPY_RESULT (dst, len))
+    {
+      error (0, 0, "Wrong result in function %s %p %p", impl->name,
+	     CALL (impl, dst, src, len), MEMCPY_RESULT (dst, len));
+      ret = 1;
+      return;
+    }
+
+  if (memcmp (dst, src, len) != 0)
+    {
+      error (0, 0, "Wrong result in function %s dst %p \"%.*s\" src %p \"%.*s\" len %zu",
+	     impl->name, dst, (int) len, dst, src, (int) len, src, len);
+      ret = 1;
+      return;
+    }
+}
+
+static void
+do_test (size_t align1, size_t align2, size_t len)
+{
+  size_t i, j;
+  char *s1, *s2;
+
+  align1 &= 63;
+  if (align1 + len >= page_size)
+    return;
+
+  align2 &= 63;
+  if (align2 + len >= page_size)
+    return;
+
+  s1 = (char *) (buf1 + align1);
+  s2 = (char *) (buf2 + align2);
+
+  for (i = 0, j = 1; i < len; i++, j += 23)
+    s1[i] = j;
+
+  FOR_EACH_IMPL (impl, 0)
+    do_one_test (impl, s2, s1, len);
+}
+
+static void
+do_random_tests (void)
+{
+  size_t i, j, n, align1, align2, len, size1, size2, size;
+  int c;
+  unsigned char *p1, *p2;
+  unsigned char *res;
+
+  for (n = 0; n < ITERATIONS; n++)
+    {
+      if (n == 0)
+	{
+	  len = getpagesize ();
+	  size = len + 512;
+	  size1 = size;
+	  size2 = size;
+	  align1 = 512;
+	  align2 = 512;
+	}
+      else
+	{
+	  if ((random () & 255) == 0)
+	    size = 65536;
+	  else
+	    size = 768;
+	  if (size > page_size)
+	    size = page_size;
+	  size1 = size;
+	  size2 = size;
+	  i = random ();
+	  if (i & 3)
+	    size -= 256;
+	  if (i & 1)
+	    size1 -= 256;
+	  if (i & 2)
+	    size2 -= 256;
+	  if (i & 4)
+	    {
+	      len = random () % size;
+	      align1 = size1 - len - (random () & 31);
+	      align2 = size2 - len - (random () & 31);
+	      if (align1 > size1)
+		align1 = 0;
+	      if (align2 > size2)
+		align2 = 0;
+	    }
+	  else
+	    {
+	      align1 = random () & 63;
+	      align2 = random () & 63;
+	      len = random () % size;
+	      if (align1 + len > size1)
+		align1 = size1 - len;
+	      if (align2 + len > size2)
+		align2 = size2 - len;
+	    }
+	}
+      p1 = buf1 + page_size - size1;
+      p2 = buf2 + page_size - size2;
+      c = random () & 255;
+      j = align1 + len + 256;
+      if (j > size1)
+	j = size1;
+      for (i = 0; i < j; ++i)
+	p1[i] = random () & 255;
+
+      FOR_EACH_IMPL (impl, 1)
+	{
+	  j = align2 + len + 256;
+	  if (j > size2)
+	    j = size2;
+	  memset (p2, c, j);
+	  res = (unsigned char *) CALL (impl,
+					(char *) (p2 + align2),
+					(char *) (p1 + align1), len);
+	  if (res != MEMCPY_RESULT (p2 + align2, len))
+	    {
+	      error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd) %p != %p",
+		     n, impl->name, align1, align2, len, res,
+		     MEMCPY_RESULT (p2 + align2, len));
+	      ret = 1;
+	    }
+	  for (i = 0; i < align2; ++i)
+	    {
+	      if (p2[i] != c)
+		{
+		  error (0, 0, "Iteration %zd - garbage before, %s (%zd, %zd, %zd)",
+			 n, impl->name, align1, align2, len);
+		  ret = 1;
+		  break;
+		}
+	    }
+	  for (i = align2 + len; i < j; ++i)
+	    {
+	      if (p2[i] != c)
+		{
+		  error (0, 0, "Iteration %zd - garbage after, %s (%zd, %zd, %zd)",
+			 n, impl->name, align1, align2, len);
+		  ret = 1;
+		  break;
+		}
+	    }
+	  if (memcmp (p1 + align1, p2 + align2, len))
+	    {
+	      error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd)",
+		     n, impl->name, align1, align2, len);
+	      ret = 1;
+	    }
+	}
+    }
+}
+
+int
+test_main (void)
+{
+  size_t i;
+
+  test_init ();
+
+  printf ("%23s", "");
+  FOR_EACH_IMPL (impl, 0)
+    printf ("\t%s", impl->name);
+  putchar ('\n');
+
+  for (i = 0; i < 18; ++i)
+    {
+      do_test (0, 0, 1 << i);
+      do_test (i, 0, 1 << i);
+      do_test (0, i, 1 << i);
+      do_test (i, i, 1 << i);
+    }
+
+  for (i = 0; i < 32; ++i)
+    {
+      do_test (0, 0, i);
+      do_test (i, 0, i);
+      do_test (0, i, i);
+      do_test (i, i, i);
+    }
+
+  for (i = 3; i < 32; ++i)
+    {
+      if ((i & (i - 1)) == 0)
+	continue;
+      do_test (0, 0, 16 * i);
+      do_test (i, 0, 16 * i);
+      do_test (0, i, 16 * i);
+      do_test (i, i, 16 * i);
+    }
+
+  do_test (0, 0, getpagesize ());
+
+  do_random_tests ();
+  return ret;
+}
+
+#include "../test-skeleton.c"