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[patch] libstdc++/65085 move-constructor doesn't terminate empty string
- From: Jonathan Wakely <jwakely at redhat dot com>
- To: libstdc++ at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
- Date: Tue, 17 Feb 2015 12:44:50 +0000
- Subject: [patch] libstdc++/65085 move-constructor doesn't terminate empty string
- Authentication-results: sourceware.org; auth=none
Tested x86_64-linux, committed to trunk.
commit 4946abe1a615343a462a86afc633f9681864becf
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Tue Feb 17 10:51:55 2015 +0000
PR libstdc++/65085
* include/bits/basic_string.h (basic_string(basic_string&&)): Ensure
empty string gets null-terminated.
* testsuite/21_strings/basic_string/cons/char/65085.cc: New.
diff --git a/libstdc++-v3/include/bits/basic_string.h b/libstdc++-v3/include/bits/basic_string.h
index 71a47f5..3b2603f 100644
--- a/libstdc++-v3/include/bits/basic_string.h
+++ b/libstdc++-v3/include/bits/basic_string.h
@@ -476,9 +476,8 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
{
if (__str._M_is_local())
{
- if (__str.length())
- traits_type::copy(_M_local_buf, __str._M_local_buf,
- _S_local_capacity + 1);
+ traits_type::copy(_M_local_buf, __str._M_local_buf,
+ _S_local_capacity + 1);
}
else
{
diff --git a/libstdc++-v3/testsuite/21_strings/basic_string/cons/char/65085.cc b/libstdc++-v3/testsuite/21_strings/basic_string/cons/char/65085.cc
new file mode 100644
index 0000000..609f7be
--- /dev/null
+++ b/libstdc++-v3/testsuite/21_strings/basic_string/cons/char/65085.cc
@@ -0,0 +1,40 @@
+// Copyright (C) 2015 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-options "-std=gnu++11" }
+
+#include <string>
+#include <new>
+#include <cstring>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+ std::string s;
+ char buf[sizeof(std::string)];
+ std::memset(buf, 0xff, sizeof(buf));
+ std::string* p = ::new(buf) std::string(std::move(s));
+ VERIFY((*p)[0] == '\0');
+ p->~basic_string();
+}
+
+int
+main()
+{
+ test01();
+}