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// 2004-08-12 Paolo Carlini <>
// Copyright (C) 2004-2021 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
// 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
// <>.
// Overridden virtual functions
#include <sstream>
#include <testsuite_hooks.h>
// libstdc++/16956
void test01()
using namespace std;
typedef stringbuf::int_type int_type;
typedef stringbuf::traits_type traits_type;
typedef stringbuf::pos_type pos_type;
typedef stringbuf::off_type off_type;
stringbuf strb_01("lara's place", ios_base::in);
pos_type pt_1 = strb_01.pubseekoff(5, ios_base::cur, ios_base::in);
int_type c1 = strb_01.sgetc();
VERIFY( c1 != traits_type::eof() );
pos_type pt_2 = strb_01.pubseekoff(2, ios_base::cur, ios_base::in);
pos_type pt_3 = strb_01.pubseekpos(pt_1, ios_base::in);
int_type c2 = strb_01.sbumpc();
VERIFY( off_type(pt_3) == off_type(pt_2) - 2 );
VERIFY( c2 == c1 );
stringbuf strb_02("-", ios_base::out);
pos_type pt_4 = strb_02.pubseekoff(0, ios_base::cur, ios_base::out);
strb_02.sputn("red", 3);
pos_type pt_5 = strb_02.pubseekoff(-3, ios_base::cur, ios_base::out);
strb_02.pubseekpos(pt_5, ios_base::out);
VERIFY( off_type(pt_5) == off_type(pt_4) );
strb_02.sputn("blu", 3);
VERIFY( strb_02.str() == "blu" );
int main()
return 0;