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[/] [scarts/] [trunk/] [toolchain/] [scarts-gcc/] [gcc-4.1.1/] [libstdc++-v3/] [testsuite/] [27_io/] [basic_istream/] [seekg/] [char/] [sstream.cc] - Rev 19
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// 2000-06-29 bkoz // Copyright (C) 2000, 2001, 2002, 2003 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 2, 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 COPYING. If not, write to the Free // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, // USA. // 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 #include <istream> #include <sstream> #include <fstream> #include <testsuite_hooks.h> // stringstreams void test05(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.tst"; std::ifstream if01(str_lit01); std::ifstream if02(str_lit01); std::ifstream if03(str_lit01); VERIFY( if01.good() ); VERIFY( if02.good() ); VERIFY( if03.good() ); std::stringbuf strbuf01(std::ios_base::in | std::ios_base::out); if01 >> &strbuf01; // initialize stringbufs that are ios_base::out std::stringbuf strbuf03(strbuf01.str(), std::ios_base::out); // initialize stringbufs that are ios_base::in std::stringbuf strbuf02(strbuf01.str(), std::ios_base::in); std::istream is01(&strbuf01); std::istream is02(&strbuf02); std::istream is03(&strbuf03); // pos_type tellg() // in | out 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 ); // as only out buffer 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 ); // as only out buffer VERIFY( state01 == state02 ); pos06 = is03.tellg(); VERIFY( pos05 == pos06 ); } int main() { test05(); return 0; }