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// Copyright (C) 2003-2015 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/>.
// 27.8.1.4 Overridden virtual functions
#include <fstream>
#include <locale>
#include <algorithm>
#include <cstring>
#include <testsuite_hooks.h>
class Cvt : public std::codecvt<wchar_t, char, mbstate_t>
{
protected:
virtual std::codecvt_base::result
do_out(std::mbstate_t&, const wchar_t* from, const wchar_t* from_end,
const wchar_t*& from_next, char* to, char* to_end,
char*& to_next) const
{
std::size_t from_len = from_end - from;
std::size_t to_len = (to_end - to) / sizeof(wchar_t);
std::size_t len = std::min(from_len, to_len);
std::memcpy(to, from, len * sizeof(wchar_t));
from_next = from + len;
to_next = to + len * sizeof(wchar_t);
return from_next == from_end ? std::codecvt_base::ok :
std::codecvt_base::partial;
}
virtual std::codecvt_base::result
do_in(std::mbstate_t&, const char* from, const char* from_end,
const char*& from_next, wchar_t* to, wchar_t* to_end,
wchar_t*& to_next) const
{
std::size_t from_len =
(from_end - from) / sizeof(wchar_t);
std::size_t to_len = to_end - to;
std::size_t len = std::min(from_len, to_len);
std::memcpy(to, from, len * sizeof(wchar_t));
from_next = from + len * sizeof(wchar_t);
to_next = to + len;
return from_next == from_end ? std::codecvt_base::ok :
std::codecvt_base::partial;
}
virtual std::codecvt_base::result
do_unshift(std::mbstate_t&, char*, char*, char*&) const
{ return std::codecvt_base::noconv; }
virtual int do_encoding() const throw() { return sizeof(wchar_t); }
virtual bool do_always_noconv() const throw() { return false; }
virtual int
do_length(std::mbstate_t&, const char* from, const char* end,
std::size_t max)
{
std::size_t len = (end - from) / sizeof(wchar_t);
return std::min(len, max) * sizeof(wchar_t);
}
virtual int do_max_length() const throw() { return sizeof(wchar_t); }
};
void test01()
{
using namespace std;
bool test __attribute__((unused)) = true;
// seekoff
wfilebuf fb;
fb.pubimbue(locale(locale::classic(), new Cvt));
fb.open("tmp_9875_seekoff", ios_base::out | ios_base::in | ios_base::trunc);
fb.sputn(L"0123456789", 10);
fb.pubseekoff(-3, ios_base::cur);
VERIFY( fb.sgetc() == L'7' );
fb.pubseekoff(-3, ios_base::cur);
VERIFY( fb.sgetc() == L'4' );
fb.close();
}
int main()
{
test01();
return 0;
}
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