| // Copyright (C) 2003-2013 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; |
| } |