r251669 - in /branches/gcc-5-branch/libstdc++-v...

[redi@gcc.gnu.org]

Author: redi
Date: Mon Sep  4 16:41:25 2017
New Revision: 251669

URL: https://gcc.gnu.org/viewcvs?rev=251669&root=gcc&view=rev
Log:
PR libstdc++/81338 correctly manage string capacity

Backport from mainline
2017-07-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/81338
	* include/bits/basic_string.h [_GLIBCXX_USE_CXX11_ABI] (basic_string):
	Declare basic_stringbuf to be a friend.
	* include/bits/sstream.tcc (basic_stringbuf::overflow)
	[_GLIBCXX_USE_CXX11_ABI]: Use unused capacity before reallocating.
	* include/std/sstream (basic_stringbuf::__xfer_bufptrs): Update string
	length to buffer length.
	* testsuite/27_io/basic_stringstream/assign/81338.cc: New.

Added:
    branches/gcc-5-branch/libstdc++-v3/testsuite/27_io/basic_stringstream/assign/81338.cc
Modified:
    branches/gcc-5-branch/libstdc++-v3/ChangeLog
    branches/gcc-5-branch/libstdc++-v3/include/bits/basic_string.h
    branches/gcc-5-branch/libstdc++-v3/include/bits/sstream.tcc
    branches/gcc-5-branch/libstdc++-v3/include/std/sstream