PR libstdc++/53984 handle exceptions in basic_istream::sentry

	PR libstdc++/53984
	* include/bits/basic_ios.h (basic_ios::_M_setstate): Adjust comment.
	* include/bits/istream.tcc (basic_istream::sentry): Handle exceptions
	during construction.
	* include/std/istream: Adjust comments for formatted input functions
	and unformatted input functions.
	* testsuite/27_io/basic_fstream/53984.cc: New.
	* testsuite/27_io/basic_istream/sentry/char/53984.cc: New.

From-SVN: r250545

1 files changed, 41 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/27_io/basic_istream/sentry/char/53984.cc b/libstdc++-v3/testsuite/27_io/basic_istream/sentry/char/53984.cc
new file mode 100644
index 0000000..9c08c72
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_istream/sentry/char/53984.cc
@@ -0,0 +1,41 @@
+// 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/>.
+
+#include <streambuf>
+#include <istream>
+#include <testsuite_hooks.h>
+
+struct SB : std::streambuf
+{
+  virtual int_type underflow() { throw 1; }
+};
+
+void
+test01()
+{
+  SB sb;
+  std::istream is(&sb);
+  int i;
+  is >> i;
+  VERIFY( is.bad() );
+}
+
+int
+main()
+{
+  test01();
+}