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re PR libstdc++/29354 (Error when seeking on an ostringstream)

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2006-10-06  Paolo Carlini  <pcarlini@suse.de>

	PR libstdc++/29354
	* include/bits/sstream.tcc (basic_stringbuf<>::seekpos(pos_type,
	ios_base::openmode)): Allow for seek to pos_type(off_type(0))
	when the stream is empty.
	* testsuite/27_io/basic_stringbuf/seekpos/char/29354.cc: New.
	* testsuite/27_io/basic_stringbuf/seekpos/wchar_t/29354.cc: New.

From-SVN: r117494
This commit is contained in:
Paolo Carlini 2006-10-06 09:57:43 +00:00 committed by Paolo Carlini
parent 706c4bb76c
commit bcf0248a99
4 changed files with 98 additions and 1 deletions
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9
libstdc++-v3/ChangeLog
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@ -1,3 +1,12 @@
2006-10-06 Paolo Carlini <pcarlini@suse.de>
PR libstdc++/29354
* include/bits/sstream.tcc (basic_stringbuf<>::seekpos(pos_type,
ios_base::openmode)): Allow for seek to pos_type(off_type(0))
when the stream is empty.
* testsuite/27_io/basic_stringbuf/seekpos/char/29354.cc: New.
* testsuite/27_io/basic_stringbuf/seekpos/wchar_t/29354.cc: New.
2006-10-04 Benjamin Kosnik <bkoz@redhat.com>
Mike Stump <mrs@apple.com>

2
libstdc++-v3/include/bits/sstream.tcc
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@ -206,7 +206,7 @@ _GLIBCXX_BEGIN_NAMESPACE(std)
const bool __testout = (ios_base::out & this->_M_mode & __mode) != 0;
const char_type* __beg = __testin ? this->eback() : this->pbase();
if (__beg && (__testin || __testout))
if ((__beg || !off_type(__sp)) && (__testin || __testout))
{
_M_update_egptr();

44
libstdc++-v3/testsuite/27_io/basic_stringbuf/seekpos/char/29354.cc Normal file
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@ -0,0 +1,44 @@
// Copyright (C) 2006 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 2, 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 COPYING. If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.
#include <sstream>
#include <testsuite_hooks.h>
// libstdc++/29354
void test01()
{
bool test __attribute__((unused)) = true;
using namespace std;
typedef stringbuf::pos_type pos_type;
typedef stringbuf::off_type off_type;
stringbuf strb_01(ios_base::out);
pos_type pt_1 = strb_01.pubseekoff(0, ios_base::cur, ios_base::out);
VERIFY( pt_1 == pos_type(off_type(0)) );
pos_type pt_2 = strb_01.pubseekpos(pt_1, ios_base::out);
VERIFY( pt_2 == pos_type(off_type(0)) );
}
int
main()
{
test01();
return 0;
}

44
libstdc++-v3/testsuite/27_io/basic_stringbuf/seekpos/wchar_t/29354.cc Normal file
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@ -0,0 +1,44 @@
// Copyright (C) 2006 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 2, 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 COPYING. If not, write to the Free
// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
// USA.
#include <sstream>
#include <testsuite_hooks.h>
// libstdc++/29354
void test01()
{
bool test __attribute__((unused)) = true;
using namespace std;
typedef stringbuf::pos_type pos_type;
typedef stringbuf::off_type off_type;
wstringbuf strb_01(ios_base::out);
pos_type pt_1 = strb_01.pubseekoff(0, ios_base::cur, ios_base::out);
VERIFY( pt_1 == pos_type(off_type(0)) );
pos_type pt_2 = strb_01.pubseekpos(pt_1, ios_base::out);
VERIFY( pt_2 == pos_type(off_type(0)) );
}
int
main()
{
test01();
return 0;
}