// 2000-06-29 bkoz // Copyright (C) 2000, 2001, 2002, 2003, 2009 Free Software Foundation // // 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 // . // 27.6.1.3 unformatted input functions // NB: ostream has a particular "seeks" category. Adopt this for istreams too. // @require@ %-*.tst %-*.txt // @diff@ %-*.tst %-*.txt // { dg-require-fileio "" } #include #include #include #include // fstreams void test04(void) { typedef std::istream::off_type off_type; bool test __attribute__((unused)) = true; std::istream::pos_type pos01, pos02, pos03, pos04, pos05, pos06; std::ios_base::iostate state01, state02; const char str_lit01[] = "istream_seeks-1.txt"; const char str_lit02[] = "istream_seeks-2.txt"; std::ifstream if01(str_lit01, std::ios_base::in | std::ios_base::out); std::ifstream if02(str_lit01, std::ios_base::in); std::ifstream if03(str_lit02, std::ios_base::out | std::ios_base::trunc); VERIFY( if01.good() ); VERIFY( if02.good() ); VERIFY( if03.good() ); std::istream is01(if01.rdbuf()); std::istream is02(if02.rdbuf()); std::istream is03(if03.rdbuf()); pos01 = is01.tellg(); pos02 = is01.tellg(); pos03 = is02.tellg(); pos04 = is02.tellg(); pos05 = is03.tellg(); pos06 = is03.tellg(); // istream& seekg(pos_type) // istream& seekg(off_type, ios_base::seekdir) // cur // NB: see library issues list 136. It's the v-3 interp that seekg // only sets the input buffer, or else istreams with buffers that // have _M_mode == ios_base::out will fail to have consistency // between seekg and tellg. state01 = is01.rdstate(); is01.seekg(10, std::ios_base::cur); state02 = is01.rdstate(); pos01 = is01.tellg(); VERIFY( pos01 == pos02 + off_type(10) ); VERIFY( state01 == state02 ); pos02 = is01.tellg(); VERIFY( pos02 == pos01 ); state01 = is02.rdstate(); is02.seekg(10, std::ios_base::cur); state02 = is02.rdstate(); pos03 = is02.tellg(); VERIFY( pos03 == pos04 + off_type(10) ); VERIFY( state01 == state02 ); pos04 = is02.tellg(); VERIFY( pos03 == pos04 ); state01 = is03.rdstate(); is03.seekg(10, std::ios_base::cur); state02 = is03.rdstate(); pos05 = is03.tellg(); VERIFY( pos05 == pos06 + off_type(10) ); VERIFY( state01 == state02 ); pos06 = is03.tellg(); VERIFY( pos05 == pos06 ); // beg state01 = is01.rdstate(); is01.seekg(20, std::ios_base::beg); state02 = is01.rdstate(); pos01 = is01.tellg(); VERIFY( pos01 == pos02 + off_type(10) ); VERIFY( state01 == state02 ); pos02 = is01.tellg(); VERIFY( pos02 == pos01 ); state01 = is02.rdstate(); is02.seekg(20, std::ios_base::beg); state02 = is02.rdstate(); pos03 = is02.tellg(); VERIFY( pos03 == pos04 + off_type(10) ); VERIFY( state01 == state02 ); pos04 = is02.tellg(); VERIFY( pos03 == pos04 ); state01 = is03.rdstate(); is03.seekg(20, std::ios_base::beg); state02 = is03.rdstate(); pos05 = is03.tellg(); VERIFY( pos05 == pos06 + off_type(10) ); VERIFY( state01 == state02 ); pos06 = is03.tellg(); VERIFY( pos05 == pos06 ); } int main() { test04(); return 0; }