| // 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 |
| // <http://www.gnu.org/licenses/>. |
| |
| // 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 <istream> |
| #include <sstream> |
| #include <fstream> |
| #include <testsuite_hooks.h> |
| |
| // 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()); |
| |
| // pos_type tellg() |
| // in | out |
| pos01 = is01.tellg(); |
| pos02 = is01.tellg(); |
| VERIFY( pos01 == pos02 ); |
| |
| // in |
| pos03 = is02.tellg(); |
| pos04 = is02.tellg(); |
| VERIFY( pos03 == pos04 ); |
| |
| // out |
| pos05 = is03.tellg(); |
| pos06 = is03.tellg(); |
| VERIFY( pos05 == pos06 ); |
| |
| // 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 ); |
| } |
| |
| int main() |
| { |
| test04(); |
| return 0; |
| } |