diff --git a/ap/libc/glibc/glibc-2.23/string/test-memccpy.c b/ap/libc/glibc/glibc-2.23/string/test-memccpy.c
new file mode 100644
index 0000000..9884c80
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/string/test-memccpy.c
@@ -0,0 +1,269 @@
+/* Test and measure memccpy 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
+#define TEST_NAME "memccpy"
+#include "test-string.h"
+
+void *simple_memccpy (void *, const void *, int, size_t);
+void *stupid_memccpy (void *, const void *, int, size_t);
+
+IMPL (stupid_memccpy, 0)
+IMPL (simple_memccpy, 0)
+IMPL (memccpy, 1)
+
+void *
+simple_memccpy (void *dst, const void *src, int c, size_t n)
+{
+  const char *s = src;
+  char *d = dst;
+
+  while (n-- > 0)
+    if ((*d++ = *s++) == (char) c)
+      return d;
+
+  return NULL;
+}
+
+void *
+stupid_memccpy (void *dst, const void *src, int c, size_t n)
+{
+  void *p = memchr (src, c, n);
+
+  if (p != NULL)
+    return mempcpy (dst, src, p - src + 1);
+
+  memcpy (dst, src, n);
+  return NULL;
+}
+
+typedef void *(*proto_t) (void *, const void *, int c, size_t);
+
+static void
+do_one_test (impl_t *impl, void *dst, const void *src, int c, size_t len,
+	     size_t n)
+{
+  void *expect = len > n ? NULL : (char *) dst + len;
+  if (CALL (impl, dst, src, c, n) != expect)
+    {
+      error (0, 0, "Wrong result in function %s %p %p", impl->name,
+	     CALL (impl, dst, src, c, n), expect);
+      ret = 1;
+      return;
+    }
+
+  if (memcmp (dst, src, len > n ? n : len) != 0)
+    {
+      error (0, 0, "Wrong result in function %s", impl->name);
+      ret = 1;
+      return;
+    }
+}
+
+static void
+do_test (size_t align1, size_t align2, int c, size_t len, size_t n,
+	 int max_char)
+{
+  size_t i;
+  char *s1, *s2;
+
+  align1 &= 7;
+  if (align1 + len >= page_size)
+    return;
+
+  align2 &= 7;
+  if (align2 + len >= page_size)
+    return;
+
+  s1 = (char *) (buf1 + align1);
+  s2 = (char *) (buf2 + align2);
+
+  for (i = 0; i < len - 1; ++i)
+    {
+      s1[i] = 32 + 23 * i % (max_char - 32);
+      if (s1[i] == (char) c)
+	--s1[i];
+    }
+  s1[len - 1] = c;
+  for (i = len; i + align1 < page_size && i < len + 64; ++i)
+    s1[i] = 32 + 32 * i % (max_char - 32);
+
+  FOR_EACH_IMPL (impl, 0)
+    do_one_test (impl, s2, s1, c, len, n);
+}
+
+static void
+do_random_tests (void)
+{
+  size_t i, j, n, align1, align2, len, size, mode;
+  unsigned char *p1 = buf1 + page_size - 512;
+  unsigned char *p2 = buf2 + page_size - 512;
+  unsigned char *res, c;
+
+  for (n = 0; n < ITERATIONS; n++)
+    {
+      mode = random ();
+      c = random ();
+      if (mode & 1)
+	{
+	  size = random () & 255;
+	  align1 = 512 - size - (random () & 15);
+	  if (mode & 2)
+	    align2 = align1 - (random () & 24);
+	  else
+	    align2 = align1 - (random () & 31);
+	  if (mode & 4)
+	    {
+	      j = align1;
+	      align1 = align2;
+	      align2 = j;
+	    }
+	  if (mode & 8)
+	    len = size - (random () & 31);
+	  else
+	    len = 512;
+	  if (len >= 512)
+	    len = random () & 511;
+	}
+      else
+	{
+	  align1 = random () & 31;
+	  if (mode & 2)
+	    align2 = random () & 31;
+	  else
+	    align2 = align1 + (random () & 24);
+	  len = random () & 511;
+	  j = align1;
+	  if (align2 > j)
+	    j = align2;
+	  if (mode & 4)
+	    {
+	      size = random () & 511;
+	      if (size + j > 512)
+		size = 512 - j - (random() & 31);
+	    }
+	  else
+	    size = 512 - j;
+	  if ((mode & 8) && len + j >= 512)
+	    len = 512 - j - (random () & 7);
+	}
+      j = len + align1 + 64;
+      if (j > 512)
+	j = 512;
+      for (i = 0; i < j; i++)
+	{
+	  if (i == len + align1)
+	    p1[i] = c;
+	  else
+	    {
+	      p1[i] = random () & 255;
+	      if (i >= align1 && i < len + align1 && p1[i] == c)
+		p1[i] = (random () & 127) + 3 + c;
+	    }
+	}
+
+      FOR_EACH_IMPL (impl, 1)
+	{
+	  unsigned char *expect;
+	  memset (p2 - 64, '\1', 512 + 64);
+	  res = CALL (impl, p2 + align2, p1 + align1, (char) c, size);
+	  if (len >= size)
+	    expect = NULL;
+	  else
+	    expect = p2 + align2 + len + 1;
+
+	  if (res != expect)
+	    {
+	      error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd, %zd, %d) %p != %p",
+		     n, impl->name, align1, align2, len, size, c, res, expect);
+	      ret = 1;
+	    }
+	  for (j = 0; j < align2 + 64; ++j)
+	    {
+	      if (p2[j - 64] != '\1')
+		{
+		  error (0, 0, "Iteration %zd - garbage before, %s (%zd, %zd, %zd)",
+			 n, impl->name, align1, align2, len);
+		  ret = 1;
+		  break;
+		}
+	    }
+	  j = align2 + len + 1;
+	  if (size + align2 < j)
+	    j = size + align2;
+	  for (; j < 512; ++j)
+	    {
+	      if (p2[j] != '\1')
+		{
+		  error (0, 0, "Iteration %zd - garbage after, %s (%zd, %zd, %zd)",
+			 n, impl->name, align1, align2, len);
+		  ret = 1;
+		  break;
+		}
+	    }
+	  j = len + 1;
+	  if (size < j)
+	    j = size;
+	  if (memcmp (p1 + align1, p2 + align2, j))
+	    {
+	      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 ("%28s", "");
+  FOR_EACH_IMPL (impl, 0)
+    printf ("\t%s", impl->name);
+  putchar ('\n');
+
+  for (i = 1; i < 8; ++i)
+    {
+      do_test (i, i, 12, 16, 16, 127);
+      do_test (i, i, 23, 16, 16, 255);
+      do_test (i, 2 * i, 28, 16, 16, 127);
+      do_test (2 * i, i, 31, 16, 16, 255);
+      do_test (8 - i, 2 * i, 1, 1 << i, 2 << i, 127);
+      do_test (2 * i, 8 - i, 17, 2 << i, 1 << i, 127);
+      do_test (8 - i, 2 * i, 0, 1 << i, 2 << i, 255);
+      do_test (2 * i, 8 - i, i, 2 << i, 1 << i, 255);
+    }
+
+  for (i = 1; i < 8; ++i)
+    {
+      do_test (0, 0, i, 4 << i, 8 << i, 127);
+      do_test (0, 0, i, 16 << i, 8 << i, 127);
+      do_test (8 - i, 2 * i, i, 4 << i, 8 << i, 127);
+      do_test (8 - i, 2 * i, i, 16 << i, 8 << i, 127);
+    }
+
+  do_random_tests ();
+  return ret;
+}
+
+#include "../test-skeleton.c"