1// Copyright (C) 2003 Free Software Foundation, Inc. 2// 3// This file is part of the GNU ISO C++ Library. This library is free 4// software; you can redistribute it and/or modify it under the 5// terms of the GNU General Public License as published by the 6// Free Software Foundation; either version 2, or (at your option) 7// any later version. 8 9// This library is distributed in the hope that it will be useful, 10// but WITHOUT ANY WARRANTY; without even the implied warranty of 11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12// GNU General Public License for more details. 13 14// You should have received a copy of the GNU General Public License along 15// with this library; see the file COPYING. If not, write to the Free 16// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 17// USA. 18 19// 27.8.1.4 Overridden virtual functions 20 21#include <locale> 22#include <fstream> 23#include <testsuite_hooks.h> 24 25class Cvt : public std::codecvt<char, char, std::mbstate_t> 26{ 27public: 28 mutable bool unshift_called; 29 30 Cvt() 31 : unshift_called(false) 32 { } 33 34protected: 35 bool 36 do_always_noconv() const throw() 37 { return false; } 38 39 int 40 do_encoding() const throw() 41 { return -1; } 42 43 std::codecvt_base::result 44 do_unshift(std::mbstate_t&, char* to, char*, char*& to_next) const 45 { 46 unshift_called = true; 47 to_next = to; 48 return std::codecvt_base::ok; 49 } 50}; 51 52// libstdc++/12790 53// basic_filebuf::seekoff() should call codecvt::unshift() 54void test01() 55{ 56 using namespace std; 57 58 bool test __attribute__((unused)) = true; 59 const char* name = "tmp_seekoff_12790"; 60 61 Cvt* cvt = new Cvt; 62 locale loc(locale::classic(), cvt); 63 64 filebuf fb; 65 fb.pubsetbuf(0, 0); 66 fb.pubimbue(loc); 67 68 fb.open(name, ios_base::out); 69 fb.sputc('a'); 70 71 VERIFY( !cvt->unshift_called ); 72 fb.pubseekoff(0, ios_base::cur); 73 VERIFY( cvt->unshift_called ); 74} 75 76int main() 77{ 78 test01(); 79 return 0; 80} 81