r246245 - in /trunk/libstdc++-v3: ChangeLog src...

[redi@gcc.gnu.org]

Author: redi
Date: Fri Mar 17 19:28:05 2017
New Revision: 246245

URL: https://gcc.gnu.org/viewcvs?rev=246245&root=gcc&view=rev
Log:
Fix alignment bugs in std::codecvt_utf16

	* src/c++11/codecvt.cc (range): Add non-type template parameter and
	define oerloaded operators for reading and writing code units.
	(range<Elem, false>): Define partial specialization for accessing
	wide characters in potentially unaligned byte ranges.
	(ucs2_span(const char16_t*, const char16_t*, ...))
	(ucs4_span(const char16_t*, const char16_t*, ...)): Change parameters
	to range<const char16_t, false> in order to avoid unaligned reads.
	(__codecvt_utf16_base<char16_t>::do_out)
	(__codecvt_utf16_base<char32_t>::do_out)
	(__codecvt_utf16_base<wchar_t>::do_out): Use range specialization for
	unaligned data to avoid unaligned writes.
	(__codecvt_utf16_base<char16_t>::do_in)
	(__codecvt_utf16_base<char32_t>::do_in)
	(__codecvt_utf16_base<wchar_t>::do_in): Likewise for writes. Return
	error if there are unprocessable trailing bytes.
	(__codecvt_utf16_base<char16_t>::do_length)
	(__codecvt_utf16_base<char32_t>::do_length)
	(__codecvt_utf16_base<wchar_t>::do_length): Pass arguments of type
	range<const char16_t, false> to span functions.
	* testsuite/22_locale/codecvt/codecvt_utf16/misaligned.cc: New test.

Added:
    trunk/libstdc++-v3/testsuite/22_locale/codecvt/codecvt_utf16/misaligned.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/src/c++11/codecvt.cc
    trunk/libstdc++-v3/testsuite/22_locale/codecvt/codecvt_utf16/79980.cc