diff --git a/ap/libc/glibc/glibc-2.23/string/test-strcat.c b/ap/libc/glibc/glibc-2.23/string/test-strcat.c
new file mode 100644
index 0000000..1dda021
--- /dev/null
+++ b/ap/libc/glibc/glibc-2.23/string/test-strcat.c
@@ -0,0 +1,272 @@
+/* Test strcat 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
+#ifndef WIDE
+# define TEST_NAME "strcat"
+#else
+# define TEST_NAME "wcscat"
+#endif /* WIDE */
+#include "test-string.h"
+
+#ifndef WIDE
+# define STRCAT strcat
+# define CHAR char
+# define UCHAR unsigned char
+# define sfmt "s"
+# define SIMPLE_STRCAT simple_strcat
+# define STRLEN strlen
+# define STRCMP strcmp
+# define MEMSET memset
+# define MEMCPY memcpy
+# define MEMCMP memcmp
+# define BIG_CHAR CHAR_MAX
+# define SMALL_CHAR 127
+#else
+# include <wchar.h>
+# define STRCAT wcscat
+# define CHAR wchar_t
+# define UCHAR wchar_t
+# define sfmt "ls"
+# define SIMPLE_STRCAT simple_wcscat
+# define STRLEN wcslen
+# define STRCMP wcscmp
+# define MEMSET wmemset
+# define MEMCPY wmemcpy
+# define MEMCMP wmemcmp
+# define BIG_CHAR WCHAR_MAX
+# define SMALL_CHAR 1273
+#endif /* WIDE */
+
+typedef CHAR *(*proto_t) (CHAR *, const CHAR *);
+CHAR *SIMPLE_STRCAT (CHAR *, const CHAR *);
+
+IMPL (SIMPLE_STRCAT, 0)
+IMPL (STRCAT, 1)
+
+CHAR *
+SIMPLE_STRCAT (CHAR *dst, const CHAR *src)
+{
+  CHAR *ret = dst;
+  while (*dst++ != '\0');
+  --dst;
+  while ((*dst++ = *src++) != '\0');
+  return ret;
+}
+
+static void
+do_one_test (impl_t *impl, CHAR *dst, const CHAR *src)
+{
+  size_t k = STRLEN (dst);
+  if (CALL (impl, dst, src) != dst)
+    {
+      error (0, 0, "Wrong result in function %s %p %p", impl->name,
+	     CALL (impl, dst, src), dst);
+      ret = 1;
+      return;
+    }
+
+  if (STRCMP (dst + k, src) != 0)
+    {
+      error (0, 0, "Wrong result in function %s dst \"%" sfmt "\" src \"%" sfmt "\"",
+	     impl->name, dst, src);
+      ret = 1;
+      return;
+    }
+}
+
+static void
+do_test (size_t align1, size_t align2, size_t len1, size_t len2, int max_char)
+{
+  size_t i;
+  CHAR *s1, *s2;
+
+  align1 &= 7;
+  if ((align1 + len1) * sizeof (CHAR) >= page_size)
+    return;
+
+  align2 &= 7;
+  if ((align2 + len1 + len2) * sizeof (CHAR) >= page_size)
+    return;
+
+  s1 = (CHAR *) (buf1) + align1;
+  s2 = (CHAR *) (buf2) + align2;
+
+  for (i = 0; i < len1; ++i)
+    s1[i] = 32 + 23 * i % (max_char - 32);
+  s1[len1] = '\0';
+
+  for (i = 0; i < len2; i++)
+    s2[i] = 32 + 23 * i % (max_char - 32);
+
+  FOR_EACH_IMPL (impl, 0)
+    {
+      s2[len2] = '\0';
+      do_one_test (impl, s2, s1);
+    }
+}
+
+static void
+do_random_tests (void)
+{
+  size_t i, j, n, align1, align2, len1, len2;
+  UCHAR *p1 = (UCHAR *) (buf1 + page_size) - 512;
+  UCHAR *p2 = (UCHAR *) (buf2 + page_size) - 512;
+  UCHAR *p3 = (UCHAR *) buf1;
+  UCHAR *res;
+
+  for (n = 0; n < ITERATIONS; n++)
+    {
+      align1 = random () & 31;
+      if (random () & 1)
+	align2 = random () & 31;
+      else
+	align2 = align1 + (random () & 24);
+      len1 = random () & 511;
+      if (len1 + align2 > 512)
+	len2 = random () & 7;
+      else
+	len2 = (512 - len1 - align2) * (random () & (1024 * 1024 - 1))
+	       / (1024 * 1024);
+      j = align1;
+      if (align2 + len2 > j)
+	j = align2 + len2;
+      if (len1 + j >= 511)
+	len1 = 510 - j - (random () & 7);
+      if (len1 >= 512)
+	len1 = 0;
+      if (align1 + len1 < 512 - 8)
+	{
+	  j = 510 - align1 - len1 - (random () & 31);
+	  if (j > 0 && j < 512)
+	    align1 += j;
+	}
+      j = len1 + align1 + 64;
+      if (j > 512)
+	j = 512;
+      for (i = 0; i < j; i++)
+	{
+	  if (i == len1 + align1)
+	    p1[i] = 0;
+	  else
+	    {
+	      p1[i] = random () & BIG_CHAR;
+	      if (i >= align1 && i < len1 + align1 && !p1[i])
+		p1[i] = (random () & SMALL_CHAR) + 3;
+	    }
+	}
+      for (i = 0; i < len2; i++)
+	{
+	  p3[i] = random () & BIG_CHAR;
+	  if (!p3[i])
+	    p3[i] = (random () & SMALL_CHAR) + 3;
+	}
+      p3[len2] = 0;
+
+      FOR_EACH_IMPL (impl, 1)
+	{
+	  MEMSET (p2 - 64, '\1', align2 + 64);
+	  MEMSET (p2 + align2 + len2 + 1, '\1', 512 - align2 - len2 - 1);
+	  MEMCPY (p2 + align2, p3, len2 + 1);
+	  res = (UCHAR *) CALL (impl, (CHAR *) (p2 + align2),
+				(CHAR *) (p1 + align1));
+	  if (res != p2 + align2)
+	    {
+	      error (0, 0, "Iteration %zd - wrong result in function %s (%zd, %zd, %zd %zd) %p != %p",
+		     n, impl->name, align1, align2, len1, len2, res,
+		     p2 + align2);
+	      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, %zd)",
+			 n, impl->name, align1, align2, len1, len2);
+		  ret = 1;
+		  break;
+		}
+	    }
+	  if (MEMCMP (p2 + align2, p3, len2))
+	    {
+	      error (0, 0, "Iteration %zd - garbage in string before, %s (%zd, %zd, %zd, %zd)",
+		     n, impl->name, align1, align2, len1, len2);
+	      ret = 1;
+	    }
+	  for (j = align2 + len1 + len2 + 1; j < 512; ++j)
+	    {
+	      if (p2[j] != '\1')
+		{
+		  error (0, 0, "Iteration %zd - garbage after, %s (%zd, %zd, %zd, %zd)",
+			 n, impl->name, align1, align2, len1, len2);
+		  ret = 1;
+		  break;
+		}
+	    }
+	  if (MEMCMP (p1 + align1, p2 + align2 + len2, len1 + 1))
+	    {
+	      error (0, 0, "Iteration %zd - different strings, %s (%zd, %zd, %zd, %zd)",
+		     n, impl->name, align1, align2, len1, len2);
+	      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 = 0; i < 16; ++i)
+    {
+      do_test (0, 0, i, i, SMALL_CHAR);
+      do_test (0, 0, i, i, BIG_CHAR);
+      do_test (0, i, i, i, SMALL_CHAR);
+      do_test (i, 0, i, i, BIG_CHAR);
+    }
+
+  for (i = 1; i < 8; ++i)
+    {
+      do_test (0, 0, 8 << i, 8 << i, SMALL_CHAR);
+      do_test (8 - i, 2 * i, 8 << i, 8 << i, SMALL_CHAR);
+      do_test (0, 0, 8 << i, 2 << i, SMALL_CHAR);
+      do_test (8 - i, 2 * i, 8 << i, 2 << i, SMALL_CHAR);
+    }
+
+  for (i = 1; i < 8; ++i)
+    {
+      do_test (i, 2 * i, 8 << i, 1, SMALL_CHAR);
+      do_test (2 * i, i, 8 << i, 1, BIG_CHAR);
+      do_test (i, i, 8 << i, 10, SMALL_CHAR);
+      do_test (i, i, 8 << i, 10, BIG_CHAR);
+    }
+
+  do_random_tests ();
+  return ret;
+}
+
+#include "../test-skeleton.c"