[locale.stdcvt]

llvm-svn: 105174

25 files changed, 4389 insertions, 0 deletions

diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_mode.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_mode.pass.cpp
new file mode 100644
index 00000000000..92043a8a005
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_mode.pass.cpp
@@ -0,0 +1,29 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// enum codecvt_mode
+// {
+//     consume_header = 4,
+//     generate_header = 2,
+//     little_endian = 1
+// };
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    assert(std::consume_header == 4);
+    assert(std::generate_header == 2);
+    assert(std::little_endian == 1);
+    std::codecvt_mode e = std::consume_header;
+    assert(e == 4);
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf16.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf16.pass.cpp
new file mode 100644
index 00000000000..25998952989
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf16.pass.cpp
@@ -0,0 +1,56 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf16
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// Not a portable test
+
+#include <codecvt>
+#include <cassert>
+
+int outstanding_news = 0;
+
+void* operator new(std::size_t s) throw(std::bad_alloc)
+{
+    ++outstanding_news;
+    return std::malloc(s);
+}
+
+void  operator delete(void* p) throw()
+{
+    if (p)
+    {
+        --outstanding_news;
+        std::free(p);
+    }
+}
+
+int main()
+{
+    assert(outstanding_news == 0);
+    {
+        typedef std::codecvt_utf16<wchar_t> C;
+        C c;
+        assert(outstanding_news == 0);
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t> C;
+        std::locale loc(std::locale::classic(), new C);
+        assert(outstanding_news != 0);
+    }
+    assert(outstanding_news == 0);
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf16_always_noconv.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf16_always_noconv.pass.cpp
new file mode 100644
index 00000000000..8d9c197e9df
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf16_always_noconv.pass.cpp
@@ -0,0 +1,45 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf16
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// bool always_noconv() const throw();
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf16<wchar_t> C;
+        C c;
+        bool r = c.always_noconv();
+        assert(r == false);
+    }
+    {
+        typedef std::codecvt_utf16<char16_t> C;
+        C c;
+        bool r = c.always_noconv();
+        assert(r == false);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t> C;
+        C c;
+        bool r = c.always_noconv();
+        assert(r == false);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf16_encoding.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf16_encoding.pass.cpp
new file mode 100644
index 00000000000..a95f78fe172
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf16_encoding.pass.cpp
@@ -0,0 +1,45 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf16
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// int encoding() const throw();
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf16<wchar_t> C;
+        C c;
+        int r = c.encoding();
+        assert(r == 0);
+    }
+    {
+        typedef std::codecvt_utf16<char16_t> C;
+        C c;
+        int r = c.encoding();
+        assert(r == 0);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t> C;
+        C c;
+        int r = c.encoding();
+        assert(r == 0);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf16_in.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf16_in.pass.cpp
new file mode 100644
index 00000000000..0572b80e6f6
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf16_in.pass.cpp
@@ -0,0 +1,739 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf16
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// result
+//     in(stateT& state,
+//        const externT* from, const externT* from_end, const externT*& from_next,
+//        internT* to, internT* to_end, internT*& to_next) const;
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf16<wchar_t> C;
+        C c;
+        wchar_t w = 0;
+        char n[4] = {0xD8, 0xC0, 0xDC, 0x03};
+        wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(w == 0x40003);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x1005);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t, 0x1000> C;
+        C c;
+        wchar_t w = 0;
+        char n[4] = {0xD8, 0xC0, 0xDC, 0x03};
+        wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t, 0x10ffff, std::consume_header> C;
+        C c;
+        wchar_t w = 0;
+        char n[6] = {0xFE, 0xFF, 0xD8, 0xC0, 0xDC, 0x03};
+        wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+6, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+6);
+        assert(w == 0x40003);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x1005);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t, 0x10ffff, std::little_endian> C;
+        C c;
+        wchar_t w = 0;
+        char n[4] = {0xC0, 0xD8, 0x03, 0xDC};
+        wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(w == 0x40003);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x1005);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t, 0x1000, std::little_endian> C;
+        C c;
+        wchar_t w = 0;
+        char n[4] = {0xC0, 0xD8, 0x03, 0xDC};
+        wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t, 0x10ffff, std::codecvt_mode(
+                                                         std::consume_header |
+                                                         std::little_endian)> C;
+        C c;
+        wchar_t w = 0;
+        char n[6] = {0xFF, 0xFE, 0xC0, 0xD8, 0x03, 0xDC};
+        wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+6, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+6);
+        assert(w == 0x40003);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x1005);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t> C;
+        C c;
+        char32_t w = 0;
+        char n[4] = {0xD8, 0xC0, 0xDC, 0x03};
+        char32_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(w == 0x40003);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x1005);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t, 0x1000> C;
+        C c;
+        char32_t w = 0;
+        char n[4] = {0xD8, 0xC0, 0xDC, 0x03};
+        char32_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t, 0x10ffff, std::consume_header> C;
+        C c;
+        char32_t w = 0;
+        char n[6] = {0xFE, 0xFF, 0xD8, 0xC0, 0xDC, 0x03};
+        char32_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+6, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+6);
+        assert(w == 0x40003);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x1005);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t, 0x10ffff, std::little_endian> C;
+        C c;
+        char32_t w = 0;
+        char n[4] = {0xC0, 0xD8, 0x03, 0xDC};
+        char32_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(w == 0x40003);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x1005);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t, 0x1000, std::little_endian> C;
+        C c;
+        char32_t w = 0;
+        char n[4] = {0xC0, 0xD8, 0x03, 0xDC};
+        char32_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t, 0x10ffff, std::codecvt_mode(
+                                                         std::consume_header |
+                                                         std::little_endian)> C;
+        C c;
+        char32_t w = 0;
+        char n[6] = {0xFF, 0xFE, 0xC0, 0xD8, 0x03, 0xDC};
+        char32_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+6, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+6);
+        assert(w == 0x40003);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x1005);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+
+    {
+        typedef std::codecvt_utf16<char16_t> C;
+        C c;
+        char16_t w = 0;
+        char n[4] = {0xD8, 0xC0, 0xDC, 0x03};
+        char16_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x1005);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<char16_t, 0x1000> C;
+        C c;
+        char16_t w = 0;
+        char n[4] = {0xD8, 0xC0, 0xDC, 0x03};
+        char16_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<char16_t, 0x10ffff, std::consume_header> C;
+        C c;
+        char16_t w = 0;
+        char n[6] = {0xFE, 0xFF, 0xD8, 0xC0, 0xDC, 0x03};
+        char16_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+6, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n+2);
+        assert(w == 0);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x1005);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<char16_t, 0x10ffff, std::little_endian> C;
+        C c;
+        char16_t w = 0;
+        char n[4] = {0xC0, 0xD8, 0x03, 0xDC};
+        char16_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x1005);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<char16_t, 0x1000, std::little_endian> C;
+        C c;
+        char16_t w = 0;
+        char n[4] = {0xC0, 0xD8, 0x03, 0xDC};
+        char16_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf16<char16_t, 0x10ffff, std::codecvt_mode(
+                                                         std::consume_header |
+                                                         std::little_endian)> C;
+        C c;
+        char16_t w = 0;
+        char n[6] = {0xFF, 0xFE, 0xC0, 0xD8, 0x03, 0xDC};
+        char16_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+6, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n+2);
+        assert(w == 0);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x1005);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x56);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp
new file mode 100644
index 00000000000..0154ec717ea
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf16_length.pass.cpp
@@ -0,0 +1,449 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf16
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// int length(stateT& state, const externT* from, const externT* from_end, 
+//            size_t max) const;
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf16<wchar_t> C;
+        C c;
+        char n[4] = {0xD8, 0xC0, 0xDC, 0x03};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 4);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t, 0x1000> C;
+        C c;
+        char n[4] = {0xD8, 0xC0, 0xDC, 0x03};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 0);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 0);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t, 0x10ffff, std::consume_header> C;
+        C c;
+        char n[6] = {0xFE, 0xFF, 0xD8, 0xC0, 0xDC, 0x03};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+6, 2);
+        assert(r == 6);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t, 0x10ffff, std::little_endian> C;
+        C c;
+        char n[4] = {0xC0, 0xD8, 0x03, 0xDC};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 4);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t, 0x1000, std::little_endian> C;
+        C c;
+        char n[4] = {0xC0, 0xD8, 0x03, 0xDC};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 0);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 0);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t, 0x10ffff, std::codecvt_mode(
+                                                         std::consume_header |
+                                                         std::little_endian)> C;
+        C c;
+        char n[6] = {0xFF, 0xFE, 0xC0, 0xD8, 0x03, 0xDC};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+6, 2);
+        assert(r == 6);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t> C;
+        C c;
+        char n[4] = {0xD8, 0xC0, 0xDC, 0x03};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 4);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t, 0x1000> C;
+        C c;
+        char n[4] = {0xD8, 0xC0, 0xDC, 0x03};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 0);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 0);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t, 0x10ffff, std::consume_header> C;
+        C c;
+        char n[6] = {0xFE, 0xFF, 0xD8, 0xC0, 0xDC, 0x03};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+6, 2);
+        assert(r == 6);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t, 0x10ffff, std::little_endian> C;
+        C c;
+        char n[4] = {0xC0, 0xD8, 0x03, 0xDC};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 4);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t, 0x1000, std::little_endian> C;
+        C c;
+        char n[4] = {0xC0, 0xD8, 0x03, 0xDC};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 0);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 0);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t, 0x10ffff, std::codecvt_mode(
+                                                         std::consume_header |
+                                                         std::little_endian)> C;
+        C c;
+        char n[6] = {0xFF, 0xFE, 0xC0, 0xD8, 0x03, 0xDC};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+6, 2);
+        assert(r == 6);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+
+    {
+        typedef std::codecvt_utf16<char16_t> C;
+        C c;
+        char n[4] = {0xD8, 0xC0, 0xDC, 0x03};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 0);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<char16_t, 0x1000> C;
+        C c;
+        char n[4] = {0xD8, 0xC0, 0xDC, 0x03};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 0);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 0);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<char16_t, 0x10ffff, std::consume_header> C;
+        C c;
+        char n[6] = {0xFE, 0xFF, 0xD8, 0xC0, 0xDC, 0x03};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+6, 2);
+        assert(r == 2);
+
+        n[0] = char(0x10);
+        n[1] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x04);
+        n[1] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x00);
+        n[1] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<char16_t, 0x10ffff, std::little_endian> C;
+        C c;
+        char n[4] = {0xC0, 0xD8, 0x03, 0xDC};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 0);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<char16_t, 0x1000, std::little_endian> C;
+        C c;
+        char n[4] = {0xC0, 0xD8, 0x03, 0xDC};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 0);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 0);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<char16_t, 0x10ffff, std::codecvt_mode(
+                                                         std::consume_header |
+                                                         std::little_endian)> C;
+        C c;
+        char n[6] = {0xFF, 0xFE, 0xC0, 0xD8, 0x03, 0xDC};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+6, 2);
+        assert(r == 2);
+
+        n[1] = char(0x10);
+        n[0] = char(0x05);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[1] = char(0x04);
+        n[0] = char(0x53);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[1] = char(0x00);
+        n[0] = char(0x56);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf16_max_length.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf16_max_length.pass.cpp
new file mode 100644
index 00000000000..35fccc70b38
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf16_max_length.pass.cpp
@@ -0,0 +1,63 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf16
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// int max_length() const throw();
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf16<wchar_t> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 4);
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t, 0xFFFFFFFF, std::consume_header> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 6);
+    }
+    {
+        typedef std::codecvt_utf16<char16_t> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 2);
+    }
+    {
+        typedef std::codecvt_utf16<char16_t, 0xFFFFFFFF, std::consume_header> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 4);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 4);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t, 0xFFFFFFFF, std::consume_header> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 6);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp
new file mode 100644
index 00000000000..e745b5ff4f3
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf16_out.pass.cpp
@@ -0,0 +1,331 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf16
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// result
+// out(stateT& state,
+//     const internT* from, const internT* from_end, const internT*& from_next,
+//     externT* to, externT* to_end, externT*& to_next) const;
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf16<wchar_t> C;
+        C c;
+        wchar_t w = 0x40003;
+        char n[4] = {0};
+        const wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(n[0] == char(0xD8));
+        assert(n[1] == char(0xC0));
+        assert(n[2] == char(0xDC));
+        assert(n[3] == char(0x03));
+
+        w = 0x1005;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0x10));
+        assert(n[1] == char(0x05));
+        assert(n[2] == char(0xDC));
+        assert(n[3] == char(0x03));
+
+        w = 0x453;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0x04));
+        assert(n[1] == char(0x53));
+        assert(n[2] == char(0xDC));
+        assert(n[3] == char(0x03));
+
+        w = 0x56;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0x00));
+        assert(n[1] == char(0x56));
+        assert(n[2] == char(0xDC));
+        assert(n[3] == char(0x03));
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t, 0x1000> C;
+        C c;
+        wchar_t w = 0x40003;
+        char n[4] = {0};
+        const wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(n[0] == char(0));
+        assert(n[1] == char(0));
+        assert(n[2] == char(0));
+        assert(n[3] == char(0));
+
+        w = 0x1005;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(n[0] == char(0));
+        assert(n[1] == char(0));
+        assert(n[2] == char(0));
+        assert(n[3] == char(0));
+
+        w = 0x453;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0x04));
+        assert(n[1] == char(0x53));
+        assert(n[2] == char(0));
+        assert(n[3] == char(0));
+
+        w = 0x56;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0x00));
+        assert(n[1] == char(0x56));
+        assert(n[2] == char(0));
+        assert(n[3] == char(0));
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t, 0x10ffff, std::generate_header> C;
+        C c;
+        wchar_t w = 0x40003;
+        char n[6] = {0};
+        const wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, &w, &w+1, wp, n, n+6, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+6);
+        assert(n[0] == char(0xFE));
+        assert(n[1] == char(0xFF));
+        assert(n[2] == char(0xD8));
+        assert(n[3] == char(0xC0));
+        assert(n[4] == char(0xDC));
+        assert(n[5] == char(0x03));
+
+        w = 0x1005;
+        r = c.out(m, &w, &w+1, wp, n, n+6, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(n[0] == char(0xFE));
+        assert(n[1] == char(0xFF));
+        assert(n[2] == char(0x10));
+        assert(n[3] == char(0x05));
+        assert(n[4] == char(0xDC));
+        assert(n[5] == char(0x03));
+
+        w = 0x453;
+        r = c.out(m, &w, &w+1, wp, n, n+6, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(n[0] == char(0xFE));
+        assert(n[1] == char(0xFF));
+        assert(n[2] == char(0x04));
+        assert(n[3] == char(0x53));
+        assert(n[4] == char(0xDC));
+        assert(n[5] == char(0x03));
+
+        w = 0x56;
+        r = c.out(m, &w, &w+1, wp, n, n+6, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(n[0] == char(0xFE));
+        assert(n[1] == char(0xFF));
+        assert(n[2] == char(0x00));
+        assert(n[3] == char(0x56));
+        assert(n[4] == char(0xDC));
+        assert(n[5] == char(0x03));
+    }
+
+    {
+        typedef std::codecvt_utf16<wchar_t, 0x10FFFF, std::little_endian> C;
+        C c;
+        wchar_t w = 0x40003;
+        char n[4] = {0};
+        const wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(n[1] == char(0xD8));
+        assert(n[0] == char(0xC0));
+        assert(n[3] == char(0xDC));
+        assert(n[2] == char(0x03));
+
+        w = 0x1005;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[1] == char(0x10));
+        assert(n[0] == char(0x05));
+        assert(n[3] == char(0xDC));
+        assert(n[2] == char(0x03));
+
+        w = 0x453;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[1] == char(0x04));
+        assert(n[0] == char(0x53));
+        assert(n[3] == char(0xDC));
+        assert(n[2] == char(0x03));
+
+        w = 0x56;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[1] == char(0x00));
+        assert(n[0] == char(0x56));
+        assert(n[3] == char(0xDC));
+        assert(n[2] == char(0x03));
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t, 0x1000, std::little_endian> C;
+        C c;
+        wchar_t w = 0x40003;
+        char n[4] = {0};
+        const wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(n[1] == char(0));
+        assert(n[0] == char(0));
+        assert(n[3] == char(0));
+        assert(n[2] == char(0));
+
+        w = 0x1005;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(n[1] == char(0));
+        assert(n[0] == char(0));
+        assert(n[3] == char(0));
+        assert(n[2] == char(0));
+
+        w = 0x453;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[1] == char(0x04));
+        assert(n[0] == char(0x53));
+        assert(n[3] == char(0));
+        assert(n[2] == char(0));
+
+        w = 0x56;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[1] == char(0x00));
+        assert(n[0] == char(0x56));
+        assert(n[3] == char(0));
+        assert(n[2] == char(0));
+    }
+    {
+        typedef std::codecvt_utf16<wchar_t, 0x10ffff, std::codecvt_mode(
+                                                         std::generate_header |
+                                                         std::little_endian)> C;
+        C c;
+        wchar_t w = 0x40003;
+        char n[6] = {0};
+        const wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, &w, &w+1, wp, n, n+6, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+6);
+        assert(n[1] == char(0xFE));
+        assert(n[0] == char(0xFF));
+        assert(n[3] == char(0xD8));
+        assert(n[2] == char(0xC0));
+        assert(n[5] == char(0xDC));
+        assert(n[4] == char(0x03));
+
+        w = 0x1005;
+        r = c.out(m, &w, &w+1, wp, n, n+6, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(n[1] == char(0xFE));
+        assert(n[0] == char(0xFF));
+        assert(n[3] == char(0x10));
+        assert(n[2] == char(0x05));
+        assert(n[5] == char(0xDC));
+        assert(n[4] == char(0x03));
+
+        w = 0x453;
+        r = c.out(m, &w, &w+1, wp, n, n+6, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(n[1] == char(0xFE));
+        assert(n[0] == char(0xFF));
+        assert(n[3] == char(0x04));
+        assert(n[2] == char(0x53));
+        assert(n[5] == char(0xDC));
+        assert(n[4] == char(0x03));
+
+        w = 0x56;
+        r = c.out(m, &w, &w+1, wp, n, n+6, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(n[1] == char(0xFE));
+        assert(n[0] == char(0xFF));
+        assert(n[3] == char(0x00));
+        assert(n[2] == char(0x56));
+        assert(n[5] == char(0xDC));
+        assert(n[4] == char(0x03));
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf16_unshift.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf16_unshift.pass.cpp
new file mode 100644
index 00000000000..61ab4648394
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf16_unshift.pass.cpp
@@ -0,0 +1,56 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf16
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// result
+//     unshift(stateT& state, 
+//             externT* to, externT* to_end, externT*& to_next) const;
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf16<wchar_t> C;
+        C c;
+        char n[4] = {0};
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.unshift(m, n, n+4, np);
+        assert(r == std::codecvt_base::noconv);
+    }
+    {
+        typedef std::codecvt_utf16<char16_t> C;
+        C c;
+        char n[4] = {0};
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.unshift(m, n, n+4, np);
+        assert(r == std::codecvt_base::noconv);
+    }
+    {
+        typedef std::codecvt_utf16<char32_t> C;
+        C c;
+        char n[4] = {0};
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.unshift(m, n, n+4, np);
+        assert(r == std::codecvt_base::noconv);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf8.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf8.pass.cpp
new file mode 100644
index 00000000000..d4f960aa556
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf8.pass.cpp
@@ -0,0 +1,56 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf8
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// Not a portable test
+
+#include <codecvt>
+#include <cassert>
+
+int outstanding_news = 0;
+
+void* operator new(std::size_t s) throw(std::bad_alloc)
+{
+    ++outstanding_news;
+    return std::malloc(s);
+}
+
+void  operator delete(void* p) throw()
+{
+    if (p)
+    {
+        --outstanding_news;
+        std::free(p);
+    }
+}
+
+int main()
+{
+    assert(outstanding_news == 0);
+    {
+        typedef std::codecvt_utf8<wchar_t> C;
+        C c;
+        assert(outstanding_news == 0);
+    }
+    {
+        typedef std::codecvt_utf8<wchar_t> C;
+        std::locale loc(std::locale::classic(), new C);
+        assert(outstanding_news != 0);
+    }
+    assert(outstanding_news == 0);
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf8_always_noconv.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_always_noconv.pass.cpp
new file mode 100644
index 00000000000..94d2e8f3e49
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_always_noconv.pass.cpp
@@ -0,0 +1,45 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf8
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// bool always_noconv() const throw();
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf8<wchar_t> C;
+        C c;
+        bool r = c.always_noconv();
+        assert(r == false);
+    }
+    {
+        typedef std::codecvt_utf8<char16_t> C;
+        C c;
+        bool r = c.always_noconv();
+        assert(r == false);
+    }
+    {
+        typedef std::codecvt_utf8<char32_t> C;
+        C c;
+        bool r = c.always_noconv();
+        assert(r == false);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf8_encoding.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_encoding.pass.cpp
new file mode 100644
index 00000000000..5ee22e3d01a
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_encoding.pass.cpp
@@ -0,0 +1,45 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf8
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// int encoding() const throw();
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf8<wchar_t> C;
+        C c;
+        int r = c.encoding();
+        assert(r == 0);
+    }
+    {
+        typedef std::codecvt_utf8<char16_t> C;
+        C c;
+        int r = c.encoding();
+        assert(r == 0);
+    }
+    {
+        typedef std::codecvt_utf8<char32_t> C;
+        C c;
+        int r = c.encoding();
+        assert(r == 0);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf8_in.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_in.pass.cpp
new file mode 100644
index 00000000000..8dd453ac81c
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_in.pass.cpp
@@ -0,0 +1,360 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf8
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// result
+//     in(stateT& state,
+//        const externT* from, const externT* from_end, const externT*& from_next,
+//        internT* to, internT* to_end, internT*& to_next) const;
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf8<wchar_t> C;
+        C c;
+        wchar_t w = 0;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(w == 0x40003);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.in(m, n, n+3, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+3);
+        assert(w == 0x1005);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+1);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf8<wchar_t, 0x1000> C;
+        C c;
+        wchar_t w = 0;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.in(m, n, n+3, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+1);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf8<wchar_t, 0xFFFFFFFF, std::consume_header> C;
+        C c;
+        wchar_t w = 0;
+        char n[7] = {0xEF, 0xBB, 0xBF, 0xF1, 0x80, 0x80, 0x83};
+        wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+7, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+7);
+        assert(w == 0x40003);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.in(m, n, n+3, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+3);
+        assert(w == 0x1005);
+
+        n[0] = char(0xEF);
+        n[1] = char(0xBB);
+        n[2] = char(0xBF);
+        n[3] = char(0xD1);
+        n[4] = char(0x93);
+        r = c.in(m, n, n+5, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+5);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+1);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf8<char32_t> C;
+        C c;
+        char32_t w = 0;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        char32_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(w == 0x40003);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.in(m, n, n+3, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+3);
+        assert(w == 0x1005);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+1);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf8<char32_t, 0x1000> C;
+        C c;
+        char32_t w = 0;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        char32_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.in(m, n, n+3, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+1);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf8<char32_t, 0xFFFFFFFF, std::consume_header> C;
+        C c;
+        char32_t w = 0;
+        char n[7] = {0xEF, 0xBB, 0xBF, 0xF1, 0x80, 0x80, 0x83};
+        char32_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+7, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+7);
+        assert(w == 0x40003);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.in(m, n, n+3, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+3);
+        assert(w == 0x1005);
+
+        n[0] = char(0xEF);
+        n[1] = char(0xBB);
+        n[2] = char(0xBF);
+        n[3] = char(0xD1);
+        n[4] = char(0x93);
+        r = c.in(m, n, n+5, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+5);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+1);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf8<char16_t> C;
+        C c;
+        char16_t w = 0;
+        char n[3] = {0xE1, 0x80, 0x85};
+        char16_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+3, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+3);
+        assert(w == 0x1005);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+1);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf8<char16_t, 0x1000> C;
+        C c;
+        char16_t w = 0;
+        char n[3] = {0xE1, 0x80, 0x85};
+        char16_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+3, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(w == 0);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+1);
+        assert(w == 0x56);
+    }
+    {
+        typedef std::codecvt_utf8<char16_t, 0xFFFFFFFF, std::consume_header> C;
+        C c;
+        char16_t w = 0;
+        char n[6] = {0xEF, 0xBB, 0xBF, 0xE1, 0x80, 0x85};
+        char16_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+6, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+6);
+        assert(w == 0x1005);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(w == 0x453);
+
+        w = 0x56;
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, &w, &w+1, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+1);
+        assert(w == 0x56);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp
new file mode 100644
index 00000000000..f06caed24af
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_length.pass.cpp
@@ -0,0 +1,244 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf8
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// int length(stateT& state, const externT* from, const externT* from_end, 
+//            size_t max) const;
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf8<wchar_t> C;
+        C c;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 1);
+        assert(r == 4);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 3);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.length(m, n, n+2, 3);
+        assert(r == 2);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 3);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8<wchar_t, 0x1000> C;
+        C c;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 1);
+        assert(r == 0);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 0);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.length(m, n, n+2, 3);
+        assert(r == 2);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 3);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8<wchar_t, 0xFFFFFFFF, std::consume_header> C;
+        C c;
+        char n[7] = {0xEF, 0xBB, 0xBF, 0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+7, 1);
+        assert(r == 7);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 3);
+
+        n[0] = char(0xEF);
+        n[1] = char(0xBB);
+        n[2] = char(0xBF);
+        n[3] = char(0xD1);
+        n[4] = char(0x93);
+        r = c.length(m, n, n+5, 3);
+        assert(r == 5);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 3);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8<char32_t> C;
+        C c;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 1);
+        assert(r == 4);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 3);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.length(m, n, n+2, 3);
+        assert(r == 2);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 3);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8<char32_t, 0x1000> C;
+        C c;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 1);
+        assert(r == 0);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 0);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.length(m, n, n+2, 3);
+        assert(r == 2);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 3);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8<char32_t, 0xFFFFFFFF, std::consume_header> C;
+        C c;
+        char n[7] = {0xEF, 0xBB, 0xBF, 0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+7, 1);
+        assert(r == 7);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 3);
+
+        n[0] = char(0xEF);
+        n[1] = char(0xBB);
+        n[2] = char(0xBF);
+        n[3] = char(0xD1);
+        n[4] = char(0x93);
+        r = c.length(m, n, n+5, 3);
+        assert(r == 5);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 3);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8<char16_t> C;
+        C c;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 1);
+        assert(r == 0);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 3);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.length(m, n, n+2, 3);
+        assert(r == 2);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 3);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8<char16_t, 0x1000> C;
+        C c;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 1);
+        assert(r == 0);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 0);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.length(m, n, n+2, 3);
+        assert(r == 2);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 3);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8<char16_t, 0xFFFFFFFF, std::consume_header> C;
+        C c;
+        char n[7] = {0xEF, 0xBB, 0xBF, 0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+7, 1);
+        assert(r == 3);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 3);
+
+        n[0] = char(0xEF);
+        n[1] = char(0xBB);
+        n[2] = char(0xBF);
+        n[3] = char(0xD1);
+        n[4] = char(0x93);
+        r = c.length(m, n, n+5, 3);
+        assert(r == 5);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 3);
+        assert(r == 1);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf8_max_length.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_max_length.pass.cpp
new file mode 100644
index 00000000000..a7a47d083b1
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_max_length.pass.cpp
@@ -0,0 +1,63 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf8
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// int max_length() const throw();
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf8<wchar_t> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 4);
+    }
+    {
+        typedef std::codecvt_utf8<wchar_t, 0xFFFFFFFF, std::consume_header> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 7);
+    }
+    {
+        typedef std::codecvt_utf8<char16_t> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 3);
+    }
+    {
+        typedef std::codecvt_utf8<char16_t, 0xFFFFFFFF, std::consume_header> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 6);
+    }
+    {
+        typedef std::codecvt_utf8<char32_t> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 4);
+    }
+    {
+        typedef std::codecvt_utf8<char32_t, 0xFFFFFFFF, std::consume_header> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 7);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp
new file mode 100644
index 00000000000..5ed05747da8
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_out.pass.cpp
@@ -0,0 +1,456 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf8
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// result
+// out(stateT& state,
+//     const internT* from, const internT* from_end, const internT*& from_next,
+//     externT* to, externT* to_end, externT*& to_next) const;
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf8<wchar_t> C;
+        C c;
+        wchar_t w = 0x40003;
+        char n[4] = {0};
+        const wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(n[0] == char(0xF1));
+        assert(n[1] == char(0x80));
+        assert(n[2] == char(0x80));
+        assert(n[3] == char(0x83));
+
+        w = 0x1005;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+3);
+        assert(n[0] == char(0xE1));
+        assert(n[1] == char(0x80));
+        assert(n[2] == char(0x85));
+        assert(n[3] == char(0x83));
+
+        w = 0x453;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0xD1));
+        assert(n[1] == char(0x93));
+        assert(n[2] == char(0x85));
+        assert(n[3] == char(0x83));
+
+        w = 0x56;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+1);
+        assert(n[0] == char(0x56));
+        assert(n[1] == char(0x93));
+        assert(n[2] == char(0x85));
+        assert(n[3] == char(0x83));
+    }
+    {
+        typedef std::codecvt_utf8<wchar_t, 0x1000> C;
+        C c;
+        wchar_t w = 0x40003;
+        char n[4] = {0};
+        const wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(n[0] == char(0));
+        assert(n[1] == char(0));
+        assert(n[2] == char(0));
+        assert(n[3] == char(0));
+
+        w = 0x1005;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(n[0] == char(0));
+        assert(n[1] == char(0));
+        assert(n[2] == char(0));
+        assert(n[3] == char(0));
+
+        w = 0x453;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0xD1));
+        assert(n[1] == char(0x93));
+        assert(n[2] == char(0));
+        assert(n[3] == char(0));
+
+        w = 0x56;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+1);
+        assert(n[0] == char(0x56));
+        assert(n[1] == char(0x93));
+        assert(n[2] == char(0));
+        assert(n[3] == char(0));
+    }
+    {
+        typedef std::codecvt_utf8<wchar_t, 0xFFFFFFFF, std::generate_header> C;
+        C c;
+        wchar_t w = 0x40003;
+        char n[7] = {0};
+        const wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, &w, &w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+7);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xF1));
+        assert(n[4] == char(0x80));
+        assert(n[5] == char(0x80));
+        assert(n[6] == char(0x83));
+
+        w = 0x1005;
+        r = c.out(m, &w, &w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+6);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xE1));
+        assert(n[4] == char(0x80));
+        assert(n[5] == char(0x85));
+        assert(n[6] == char(0x83));
+
+        w = 0x453;
+        r = c.out(m, &w, &w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+5);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xD1));
+        assert(n[4] == char(0x93));
+        assert(n[5] == char(0x85));
+        assert(n[6] == char(0x83));
+
+        w = 0x56;
+        r = c.out(m, &w, &w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0x56));
+        assert(n[4] == char(0x93));
+        assert(n[5] == char(0x85));
+        assert(n[6] == char(0x83));
+    }
+    {
+        typedef std::codecvt_utf8<char32_t> C;
+        C c;
+        char32_t w = 0x40003;
+        char n[4] = {0};
+        const char32_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(n[0] == char(0xF1));
+        assert(n[1] == char(0x80));
+        assert(n[2] == char(0x80));
+        assert(n[3] == char(0x83));
+
+        w = 0x1005;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+3);
+        assert(n[0] == char(0xE1));
+        assert(n[1] == char(0x80));
+        assert(n[2] == char(0x85));
+        assert(n[3] == char(0x83));
+
+        w = 0x453;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0xD1));
+        assert(n[1] == char(0x93));
+        assert(n[2] == char(0x85));
+        assert(n[3] == char(0x83));
+
+        w = 0x56;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+1);
+        assert(n[0] == char(0x56));
+        assert(n[1] == char(0x93));
+        assert(n[2] == char(0x85));
+        assert(n[3] == char(0x83));
+    }
+    {
+        typedef std::codecvt_utf8<char32_t, 0x1000> C;
+        C c;
+        char32_t w = 0x40003;
+        char n[4] = {0};
+        const char32_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(n[0] == char(0));
+        assert(n[1] == char(0));
+        assert(n[2] == char(0));
+        assert(n[3] == char(0));
+
+        w = 0x1005;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(n[0] == char(0));
+        assert(n[1] == char(0));
+        assert(n[2] == char(0));
+        assert(n[3] == char(0));
+
+        w = 0x453;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0xD1));
+        assert(n[1] == char(0x93));
+        assert(n[2] == char(0));
+        assert(n[3] == char(0));
+
+        w = 0x56;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+1);
+        assert(n[0] == char(0x56));
+        assert(n[1] == char(0x93));
+        assert(n[2] == char(0));
+        assert(n[3] == char(0));
+    }
+    {
+        typedef std::codecvt_utf8<char32_t, 0xFFFFFFFF, std::generate_header> C;
+        C c;
+        char32_t w = 0x40003;
+        char n[7] = {0};
+        const char32_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, &w, &w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+7);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xF1));
+        assert(n[4] == char(0x80));
+        assert(n[5] == char(0x80));
+        assert(n[6] == char(0x83));
+
+        w = 0x1005;
+        r = c.out(m, &w, &w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+6);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xE1));
+        assert(n[4] == char(0x80));
+        assert(n[5] == char(0x85));
+        assert(n[6] == char(0x83));
+
+        w = 0x453;
+        r = c.out(m, &w, &w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+5);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xD1));
+        assert(n[4] == char(0x93));
+        assert(n[5] == char(0x85));
+        assert(n[6] == char(0x83));
+
+        w = 0x56;
+        r = c.out(m, &w, &w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0x56));
+        assert(n[4] == char(0x93));
+        assert(n[5] == char(0x85));
+        assert(n[6] == char(0x83));
+    }
+    {
+        typedef std::codecvt_utf8<char16_t> C;
+        C c;
+        char16_t w = 0x1005;
+        char n[4] = {0};
+        const char16_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+3);
+        assert(n[0] == char(0xE1));
+        assert(n[1] == char(0x80));
+        assert(n[2] == char(0x85));
+        assert(n[3] == char(0));
+
+        w = 0x453;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0xD1));
+        assert(n[1] == char(0x93));
+        assert(n[2] == char(0x85));
+        assert(n[3] == char(0));
+
+        w = 0x56;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+1);
+        assert(n[0] == char(0x56));
+        assert(n[1] == char(0x93));
+        assert(n[2] == char(0x85));
+        assert(n[3] == char(0));
+    }
+    {
+        typedef std::codecvt_utf8<char16_t, 0x1000> C;
+        C c;
+        char16_t w = 0x1005;
+        char n[4] = {0};
+        const char16_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::error);
+        assert(wp == &w);
+        assert(np == n);
+        assert(n[0] == char(0));
+        assert(n[1] == char(0));
+        assert(n[2] == char(0));
+        assert(n[3] == char(0));
+
+        w = 0x453;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0xD1));
+        assert(n[1] == char(0x93));
+        assert(n[2] == char(0));
+        assert(n[3] == char(0));
+
+        w = 0x56;
+        r = c.out(m, &w, &w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+1);
+        assert(n[0] == char(0x56));
+        assert(n[1] == char(0x93));
+        assert(n[2] == char(0));
+        assert(n[3] == char(0));
+    }
+    {
+        typedef std::codecvt_utf8<char16_t, 0xFFFFFFFF, std::generate_header> C;
+        C c;
+        char16_t w = 0x1005;
+        char n[7] = {0};
+        const char16_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, &w, &w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+6);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xE1));
+        assert(n[4] == char(0x80));
+        assert(n[5] == char(0x85));
+        assert(n[6] == char(0));
+
+        w = 0x453;
+        r = c.out(m, &w, &w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+5);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xD1));
+        assert(n[4] == char(0x93));
+        assert(n[5] == char(0x85));
+        assert(n[6] == char(0));
+
+        w = 0x56;
+        r = c.out(m, &w, &w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == &w+1);
+        assert(np == n+4);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0x56));
+        assert(n[4] == char(0x93));
+        assert(n[5] == char(0x85));
+        assert(n[6] == char(0));
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf8_unshift.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_unshift.pass.cpp
new file mode 100644
index 00000000000..054c1a71a98
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_unshift.pass.cpp
@@ -0,0 +1,56 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf8
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// result
+//     unshift(stateT& state, 
+//             externT* to, externT* to_end, externT*& to_next) const;
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf8<wchar_t> C;
+        C c;
+        char n[4] = {0};
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.unshift(m, n, n+4, np);
+        assert(r == std::codecvt_base::noconv);
+    }
+    {
+        typedef std::codecvt_utf8<char16_t> C;
+        C c;
+        char n[4] = {0};
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.unshift(m, n, n+4, np);
+        assert(r == std::codecvt_base::noconv);
+    }
+    {
+        typedef std::codecvt_utf8<char32_t> C;
+        C c;
+        char n[4] = {0};
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.unshift(m, n, n+4, np);
+        assert(r == std::codecvt_base::noconv);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_always_noconv.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_always_noconv.pass.cpp
new file mode 100644
index 00000000000..dfb9923f0ba
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_always_noconv.pass.cpp
@@ -0,0 +1,45 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf8_utf16
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// bool always_noconv() const throw();
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf8_utf16<wchar_t> C;
+        C c;
+        bool r = c.always_noconv();
+        assert(r == false);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char16_t> C;
+        C c;
+        bool r = c.always_noconv();
+        assert(r == false);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char32_t> C;
+        C c;
+        bool r = c.always_noconv();
+        assert(r == false);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_encoding.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_encoding.pass.cpp
new file mode 100644
index 00000000000..f16e30e5ee5
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_encoding.pass.cpp
@@ -0,0 +1,45 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf8_utf16
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// int encoding() const throw();
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf8_utf16<wchar_t> C;
+        C c;
+        int r = c.encoding();
+        assert(r == 0);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char16_t> C;
+        C c;
+        int r = c.encoding();
+        assert(r == 0);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char32_t> C;
+        C c;
+        int r = c.encoding();
+        assert(r == 0);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_in.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_in.pass.cpp
new file mode 100644
index 00000000000..4427ece2e02
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_in.pass.cpp
@@ -0,0 +1,372 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf8_utf16
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// result
+//     in(stateT& state,
+//        const externT* from, const externT* from_end, const externT*& from_next,
+//        internT* to, internT* to_end, internT*& to_next) const;
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf8_utf16<wchar_t> C;
+        C c;
+        wchar_t w[2] = {0};
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+2);
+        assert(np == n+4);
+        assert(w[0] == 0xD8C0);
+        assert(w[1] == 0xDC03);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.in(m, n, n+3, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+3);
+        assert(w[0] == 0x1005);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+2);
+        assert(w[0] == 0x0453);
+
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+1);
+        assert(w[0] == 0x0056);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<wchar_t, 0x1000> C;
+        C c;
+        wchar_t w[2] = {0};
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, w, w+2, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == w);
+        assert(np == n);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.in(m, n, n+3, np, w, w+2, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == w);
+        assert(np == n);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+2);
+        assert(w[0] == 0x0453);
+
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+1);
+        assert(w[0] == 0x0056);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<wchar_t, 0x10ffff, std::consume_header> C;
+        C c;
+        wchar_t w[2] = {0};
+        char n[7] = {0xEF, 0xBB, 0xBF, 0xF1, 0x80, 0x80, 0x83};
+        wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+7, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+2);
+        assert(np == n+7);
+        assert(w[0] == 0xD8C0);
+        assert(w[1] == 0xDC03);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.in(m, n, n+3, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+3);
+        assert(w[0] == 0x1005);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+2);
+        assert(w[0] == 0x0453);
+
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+1);
+        assert(w[0] == 0x0056);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char32_t> C;
+        C c;
+        char32_t w[2] = {0};
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        char32_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+2);
+        assert(np == n+4);
+        assert(w[0] == 0xD8C0);
+        assert(w[1] == 0xDC03);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.in(m, n, n+3, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+3);
+        assert(w[0] == 0x1005);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+2);
+        assert(w[0] == 0x0453);
+
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+1);
+        assert(w[0] == 0x0056);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char32_t, 0x1000> C;
+        C c;
+        char32_t w[2] = {0};
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        char32_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, w, w+2, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == w);
+        assert(np == n);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.in(m, n, n+3, np, w, w+2, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == w);
+        assert(np == n);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+2);
+        assert(w[0] == 0x0453);
+
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+1);
+        assert(w[0] == 0x0056);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char32_t, 0x10ffff, std::consume_header> C;
+        C c;
+        char32_t w[2] = {0};
+        char n[7] = {0xEF, 0xBB, 0xBF, 0xF1, 0x80, 0x80, 0x83};
+        char32_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+7, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+2);
+        assert(np == n+7);
+        assert(w[0] == 0xD8C0);
+        assert(w[1] == 0xDC03);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.in(m, n, n+3, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+3);
+        assert(w[0] == 0x1005);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+2);
+        assert(w[0] == 0x0453);
+
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+1);
+        assert(w[0] == 0x0056);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char16_t> C;
+        C c;
+        char16_t w[2] = {0};
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        char16_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+2);
+        assert(np == n+4);
+        assert(w[0] == 0xD8C0);
+        assert(w[1] == 0xDC03);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.in(m, n, n+3, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+3);
+        assert(w[0] == 0x1005);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+2);
+        assert(w[0] == 0x0453);
+
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+1);
+        assert(w[0] == 0x0056);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char16_t, 0x1000> C;
+        C c;
+        char16_t w[2] = {0};
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        char16_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+4, np, w, w+2, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == w);
+        assert(np == n);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.in(m, n, n+3, np, w, w+2, wp);
+        assert(r == std::codecvt_base::error);
+        assert(wp == w);
+        assert(np == n);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+2);
+        assert(w[0] == 0x0453);
+
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+1);
+        assert(w[0] == 0x0056);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char16_t, 0x10ffff, std::consume_header> C;
+        C c;
+        char16_t w[2] = {0};
+        char n[7] = {0xEF, 0xBB, 0xBF, 0xF1, 0x80, 0x80, 0x83};
+        char16_t* wp = nullptr;
+        std::mbstate_t m;
+        const char* np = nullptr;
+        std::codecvt_base::result r = c.in(m, n, n+7, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+2);
+        assert(np == n+7);
+        assert(w[0] == 0xD8C0);
+        assert(w[1] == 0xDC03);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.in(m, n, n+3, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+3);
+        assert(w[0] == 0x1005);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.in(m, n, n+2, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+2);
+        assert(w[0] == 0x0453);
+
+        n[0] = char(0x56);
+        r = c.in(m, n, n+1, np, w, w+2, wp);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+1);
+        assert(w[0] == 0x0056);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_length.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_length.pass.cpp
new file mode 100644
index 00000000000..2d93657f848
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_length.pass.cpp
@@ -0,0 +1,235 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf8_utf16
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// int length(stateT& state, const externT* from, const externT* from_end, 
+//            size_t max) const;
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf8_utf16<wchar_t> C;
+        C c;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 4);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 3);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 2);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<wchar_t, 0x1000> C;
+        C c;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 0);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 0);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 2);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<wchar_t, 0x10ffff, std::consume_header> C;
+        C c;
+        char n[7] = {0xEF, 0xBB, 0xBF, 0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+7, 2);
+        assert(r == 7);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 3);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 2);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char32_t> C;
+        C c;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 4);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 3);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 2);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char32_t, 0x1000> C;
+        C c;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 0);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 0);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 2);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char32_t, 0x10ffff, std::consume_header> C;
+        C c;
+        char n[7] = {0xEF, 0xBB, 0xBF, 0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+7, 2);
+        assert(r == 7);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 3);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 2);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char16_t> C;
+        C c;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 4);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 3);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 2);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char16_t, 0x1000> C;
+        C c;
+        char n[4] = {0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+4, 2);
+        assert(r == 0);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 0);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 2);
+        assert(r == 1);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char16_t, 0x10ffff, std::consume_header> C;
+        C c;
+        char n[7] = {0xEF, 0xBB, 0xBF, 0xF1, 0x80, 0x80, 0x83};
+        std::mbstate_t m;
+        int r = c.length(m, n, n+7, 2);
+        assert(r == 7);
+
+        n[0] = char(0xE1);
+        n[1] = char(0x80);
+        n[2] = char(0x85);
+        r = c.length(m, n, n+3, 2);
+        assert(r == 3);
+
+        n[0] = char(0xD1);
+        n[1] = char(0x93);
+        r = c.length(m, n, n+2, 2);
+        assert(r == 2);
+
+        n[0] = char(0x56);
+        r = c.length(m, n, n+1, 2);
+        assert(r == 1);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_max_length.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_max_length.pass.cpp
new file mode 100644
index 00000000000..b869a285787
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_max_length.pass.cpp
@@ -0,0 +1,63 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf8_utf16
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// int max_length() const throw();
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf8_utf16<wchar_t> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 4);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<wchar_t, 0xFFFFFFFF, std::consume_header> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 7);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char16_t> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 4);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char16_t, 0xFFFFFFFF, std::consume_header> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 7);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char32_t> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 4);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char32_t, 0xFFFFFFFF, std::consume_header> C;
+        C c;
+        int r = c.max_length();
+        assert(r == 7);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_out.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_out.pass.cpp
new file mode 100644
index 00000000000..cb221410ffa
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_out.pass.cpp
@@ -0,0 +1,415 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf8_utf16
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// result
+// out(stateT& state,
+//     const internT* from, const internT* from_end, const internT*& from_next,
+//     externT* to, externT* to_end, externT*& to_next) const;
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf8_utf16<wchar_t> C;
+        C c;
+        wchar_t w[2] = {0xD8C0, 0xDC03};
+        char n[4] = {0};
+        const wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, w, w+2, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+2);
+        assert(np == n+4);
+        assert(n[0] == char(0xF1));
+        assert(n[1] == char(0x80));
+        assert(n[2] == char(0x80));
+        assert(n[3] == char(0x83));
+
+        w[0] = 0x1005;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+3);
+        assert(n[0] == char(0xE1));
+        assert(n[1] == char(0x80));
+        assert(n[2] == char(0x85));
+
+        w[0] = 0x453;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0xD1));
+        assert(n[1] == char(0x93));
+
+        w[0] = 0x56;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+1);
+        assert(n[0] == char(0x56));
+    }
+    {
+        typedef std::codecvt_utf8_utf16<wchar_t, 0x1000> C;
+        C c;
+        wchar_t w[2] = {0xD8C0, 0xDC03};
+        char n[4] = {0};
+        const wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, w, w+2, wp, n, n+4, np);
+        assert(r == std::codecvt_base::error);
+        assert(wp == w);
+        assert(np == n);
+
+        w[0] = 0x1005;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::error);
+        assert(wp == w);
+        assert(np == n);
+
+        w[0] = 0x453;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0xD1));
+        assert(n[1] == char(0x93));
+
+        w[0] = 0x56;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+1);
+        assert(n[0] == char(0x56));
+    }
+    {
+        typedef std::codecvt_utf8_utf16<wchar_t, 0x10ffff, std::generate_header> C;
+        C c;
+        wchar_t w[2] = {0xD8C0, 0xDC03};
+        char n[7] = {0};
+        const wchar_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, w, w+2, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+2);
+        assert(np == n+7);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xF1));
+        assert(n[4] == char(0x80));
+        assert(n[5] == char(0x80));
+        assert(n[6] == char(0x83));
+
+        w[0] = 0x1005;
+        r = c.out(m, w, w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+6);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xE1));
+        assert(n[4] == char(0x80));
+        assert(n[5] == char(0x85));
+
+        w[0] = 0x453;
+        r = c.out(m, w, w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+5);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xD1));
+        assert(n[4] == char(0x93));
+
+        w[0] = 0x56;
+        r = c.out(m, w, w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+4);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0x56));
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char32_t> C;
+        C c;
+        char32_t w[2] = {0xD8C0, 0xDC03};
+        char n[4] = {0};
+        const char32_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, w, w+2, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+2);
+        assert(np == n+4);
+        assert(n[0] == char(0xF1));
+        assert(n[1] == char(0x80));
+        assert(n[2] == char(0x80));
+        assert(n[3] == char(0x83));
+
+        w[0] = 0x1005;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+3);
+        assert(n[0] == char(0xE1));
+        assert(n[1] == char(0x80));
+        assert(n[2] == char(0x85));
+
+        w[0] = 0x453;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0xD1));
+        assert(n[1] == char(0x93));
+
+        w[0] = 0x56;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+1);
+        assert(n[0] == char(0x56));
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char32_t, 0x1000> C;
+        C c;
+        char32_t w[2] = {0xD8C0, 0xDC03};
+        char n[4] = {0};
+        const char32_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, w, w+2, wp, n, n+4, np);
+        assert(r == std::codecvt_base::error);
+        assert(wp == w);
+        assert(np == n);
+
+        w[0] = 0x1005;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::error);
+        assert(wp == w);
+        assert(np == n);
+
+        w[0] = 0x453;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0xD1));
+        assert(n[1] == char(0x93));
+
+        w[0] = 0x56;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+1);
+        assert(n[0] == char(0x56));
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char32_t, 0x10ffff, std::generate_header> C;
+        C c;
+        char32_t w[2] = {0xD8C0, 0xDC03};
+        char n[7] = {0};
+        const char32_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, w, w+2, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+2);
+        assert(np == n+7);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xF1));
+        assert(n[4] == char(0x80));
+        assert(n[5] == char(0x80));
+        assert(n[6] == char(0x83));
+
+        w[0] = 0x1005;
+        r = c.out(m, w, w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+6);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xE1));
+        assert(n[4] == char(0x80));
+        assert(n[5] == char(0x85));
+
+        w[0] = 0x453;
+        r = c.out(m, w, w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+5);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xD1));
+        assert(n[4] == char(0x93));
+
+        w[0] = 0x56;
+        r = c.out(m, w, w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+4);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0x56));
+    }
+
+    {
+        typedef std::codecvt_utf8_utf16<char16_t> C;
+        C c;
+        char16_t w[2] = {0xD8C0, 0xDC03};
+        char n[4] = {0};
+        const char16_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, w, w+2, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+2);
+        assert(np == n+4);
+        assert(n[0] == char(0xF1));
+        assert(n[1] == char(0x80));
+        assert(n[2] == char(0x80));
+        assert(n[3] == char(0x83));
+
+        w[0] = 0x1005;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+3);
+        assert(n[0] == char(0xE1));
+        assert(n[1] == char(0x80));
+        assert(n[2] == char(0x85));
+
+        w[0] = 0x453;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0xD1));
+        assert(n[1] == char(0x93));
+
+        w[0] = 0x56;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+1);
+        assert(n[0] == char(0x56));
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char16_t, 0x1000> C;
+        C c;
+        char16_t w[2] = {0xD8C0, 0xDC03};
+        char n[4] = {0};
+        const char16_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, w, w+2, wp, n, n+4, np);
+        assert(r == std::codecvt_base::error);
+        assert(wp == w);
+        assert(np == n);
+
+        w[0] = 0x1005;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::error);
+        assert(wp == w);
+        assert(np == n);
+
+        w[0] = 0x453;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+2);
+        assert(n[0] == char(0xD1));
+        assert(n[1] == char(0x93));
+
+        w[0] = 0x56;
+        r = c.out(m, w, w+1, wp, n, n+4, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+1);
+        assert(n[0] == char(0x56));
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char16_t, 0x10ffff, std::generate_header> C;
+        C c;
+        char16_t w[2] = {0xD8C0, 0xDC03};
+        char n[7] = {0};
+        const char16_t* wp = nullptr;
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.out(m, w, w+2, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+2);
+        assert(np == n+7);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xF1));
+        assert(n[4] == char(0x80));
+        assert(n[5] == char(0x80));
+        assert(n[6] == char(0x83));
+
+        w[0] = 0x1005;
+        r = c.out(m, w, w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+6);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xE1));
+        assert(n[4] == char(0x80));
+        assert(n[5] == char(0x85));
+
+        w[0] = 0x453;
+        r = c.out(m, w, w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+5);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0xD1));
+        assert(n[4] == char(0x93));
+
+        w[0] = 0x56;
+        r = c.out(m, w, w+1, wp, n, n+7, np);
+        assert(r == std::codecvt_base::ok);
+        assert(wp == w+1);
+        assert(np == n+4);
+        assert(n[0] == char(0xEF));
+        assert(n[1] == char(0xBB));
+        assert(n[2] == char(0xBF));
+        assert(n[3] == char(0x56));
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_unshift.pass.cpp b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_unshift.pass.cpp
new file mode 100644
index 00000000000..dc9e6557280
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/codecvt_utf8_utf16_unshift.pass.cpp
@@ -0,0 +1,56 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+// template <class Elem, unsigned long Maxcode = 0x10ffff,
+//           codecvt_mode Mode = (codecvt_mode)0>
+// class codecvt_utf8_utf16
+//     : public codecvt<Elem, char, mbstate_t>
+// {
+//     // unspecified
+// };
+
+// result
+//     unshift(stateT& state, 
+//             externT* to, externT* to_end, externT*& to_next) const;
+
+#include <codecvt>
+#include <cassert>
+
+int main()
+{
+    {
+        typedef std::codecvt_utf8_utf16<wchar_t> C;
+        C c;
+        char n[4] = {0};
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.unshift(m, n, n+4, np);
+        assert(r == std::codecvt_base::noconv);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char16_t> C;
+        C c;
+        char n[4] = {0};
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.unshift(m, n, n+4, np);
+        assert(r == std::codecvt_base::noconv);
+    }
+    {
+        typedef std::codecvt_utf8_utf16<char32_t> C;
+        C c;
+        char n[4] = {0};
+        std::mbstate_t m;
+        char* np = nullptr;
+        std::codecvt_base::result r = c.unshift(m, n, n+4, np);
+        assert(r == std::codecvt_base::noconv);
+    }
+}
diff --git a/libcxx/test/localization/locale.stdcvt/version.pass.cpp b/libcxx/test/localization/locale.stdcvt/version.pass.cpp
new file mode 100644
index 00000000000..916d9780476
--- /dev/null
+++ b/libcxx/test/localization/locale.stdcvt/version.pass.cpp
@@ -0,0 +1,20 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <codecvt>
+
+#include <codecvt>
+
+#ifndef _LIBCPP_VERSION
+#error _LIBCPP_VERSION not defined
+#endif
+
+int main()
+{
+}