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// Copyright (C) 2003, 2009 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/>.
// 27.8.1.4 Overridden virtual functions
// { dg-require-fileio "" }
#include <locale>
#include <fstream>
#include <testsuite_hooks.h>
class Cvt : public std::codecvt<char, char, std::mbstate_t>
{
public:
mutable bool unshift_called;
Cvt()
: unshift_called(false)
{ }
protected:
bool
do_always_noconv() const throw()
{ return false; }
int
do_encoding() const throw()
{ return -1; }
std::codecvt_base::result
do_unshift(std::mbstate_t&, char* to, char*, char*& to_next) const
{
unshift_called = true;
to_next = to;
return std::codecvt_base::ok;
}
};
// libstdc++/12790
// basic_filebuf::seekoff() should call codecvt::unshift()
void test01()
{
using namespace std;
bool test __attribute__((unused)) = true;
const char* name = "tmp_seekoff_12790";
Cvt* cvt = new Cvt;
locale loc(locale::classic(), cvt);
filebuf fb;
fb.pubimbue(loc);
fb.open(name, ios_base::out);
fb.sputc('a');
fb.pubsync(); // Does not call unshift()
VERIFY( !cvt->unshift_called );
fb.pubseekoff(0, ios_base::cur);
VERIFY( cvt->unshift_called );
}
int main()
{
test01();
return 0;
}
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