[PATCH 14/14] Fix UTF-16 surrogate handling.

[Stefan Liebler]

On 02/23/2016 06:42 PM, Joseph Myers wrote:
> If this is user-visible in a release, there should be a bug filed in
> Bugzilla (if there isn't one already open), and a testcase added to the
> testsuite.
>
okay.

I've filed the bug
"Bug 19727 - Converting from/to UTF-xx with iconv() does not always 
report errors on UTF-16 surrogates values."
(https://sourceware.org/bugzilla/show_bug.cgi?id=19727)

This patch also adds a new testcase, which checks UTF conversions with
input values in range of UTF16 surrogates. The test converts from
UTF-xx to INTERNAL, INTERNAL to UTF-xx and directly between
UTF-xx to UTF-yy. The latter conversion is needed because s390 has
iconv-modules, which converts from/to UTF in one step.
The new testcase was tested on a s390, power and intel machine.

ChangeLog:

	[BZ #19727]
	* iconvdata/utf-16.c (BODY): Report an error if first word is
	not a valid high surrogate.
	* iconvdata/utf-32.c (BODY): Report an error if the value is
	in range of an utf16 surrogate.
	* iconv/gconv_simple.c (BODY): Likewise.
	* iconv/tst-iconv7.c: New file.
	* iconv/Makefile (tests): Add tst-iconv7.
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