// 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 // . // 27.8.1.4 Overridden virtual functions // { dg-require-fileio "" } #include #include #include class Cvt : public std::codecvt { 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::seekpos() should call codecvt::unshift() void test01() { using namespace std; bool test __attribute__((unused)) = true; const char* name = "tmp_seekpos_12790"; Cvt* cvt = new Cvt; locale loc(locale::classic(), cvt); filebuf fb; fb.pubimbue(loc); fb.open(name, ios_base::out); streampos pos = fb.pubseekoff(0, ios_base::beg); fb.sputc('a'); VERIFY( !cvt->unshift_called ); fb.pubseekpos(pos); VERIFY( cvt->unshift_called ); } int main() { test01(); return 0; }