PR libstdc++/79511 fix endianness of UTF-16 data

	PR libstdc++/79511
	* src/c++11/codecvt.cc (write_utf16_code_point): Don't write 0xffff
	as a surrogate pair.
	(__codecvt_utf8_utf16_base<char32_t>::do_in): Use native endianness
	for internal representation.
	(__codecvt_utf8_utf16_base<wchar_t>::do_in): Likewise.
	* testsuite/22_locale/codecvt/codecvt_utf8_utf16/79511.cc: New test.

From-SVN: r246199

1 files changed, 60 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/22_locale/codecvt/codecvt_utf8_utf16/79511.cc b/libstdc++-v3/testsuite/22_locale/codecvt/codecvt_utf8_utf16/79511.cc
new file mode 100644
index 00000000000..5555bcba6fe
--- /dev/null
+++ b/libstdc++-v3/testsuite/22_locale/codecvt/codecvt_utf8_utf16/79511.cc
@@ -0,0 +1,60 @@
+// Copyright (C) 2017 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-do run { target c++11 } }
+
+#include <locale>
+#include <codecvt>
+#include <testsuite_hooks.h>
+
+// PR libstdc++/79511
+
+template<typename ElemT>
+  std::basic_string<ElemT> conv(const char* src)
+  {
+    std::wstring_convert<std::codecvt_utf8_utf16<ElemT>, ElemT> conv;
+    return conv.from_bytes(src);
+  }
+
+void
+test01()
+{
+  static char const src[] = "\xEF\xBF\xBF";
+  VERIFY( conv<char16_t>(src) == u"\xffff" );
+  VERIFY( conv<char32_t>(src) == U"\xffff" );
+#ifdef _GLIBCXX_USE_WCHAR_T
+  VERIFY( conv<wchar_t>(src) == L"\xffff" );
+#endif
+}
+
+void
+test02()
+{
+  static char const src[] = "\xE2\x82\xAC";
+  VERIFY( conv<char16_t>(src) == u"\x20ac" );
+  VERIFY( conv<char32_t>(src) == U"\x20ac" );
+#ifdef _GLIBCXX_USE_WCHAR_T
+  VERIFY( conv<wchar_t>(src) == L"\x20ac" );
+#endif
+}
+
+int
+main()
+{
+  test01();
+  test02();
+}