1// Copyright (C) 2004, 2009 Free Software Foundation 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 3, 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 COPYING3. If not see 16// <http://www.gnu.org/licenses/>. 17 18// 27.6.1.3 unformatted input functions 19// NB: ostream has a particular "seeks" category. Adopt this for istreams too. 20// @require@ %-*.tst %-*.txt 21// @diff@ %-*.tst %-*.txt 22 23#include <istream> 24#include <sstream> 25#include <fstream> 26#include <testsuite_hooks.h> 27 28// fstreams 29void test04(void) 30{ 31 typedef std::wistream::off_type off_type; 32 33 bool test __attribute__((unused)) = true; 34 std::wistream::pos_type pos01, pos02, pos03, pos04, pos05, pos06; 35 std::ios_base::iostate state01, state02; 36 const char str_lit01[] = "wistream_seeks-1.txt"; 37 const char str_lit02[] = "wistream_seeks-2.txt"; 38 std::wifstream if01(str_lit01, std::ios_base::in | std::ios_base::out); 39 std::wifstream if02(str_lit01, std::ios_base::in); 40 std::wifstream if03(str_lit02, std::ios_base::out | std::ios_base::trunc); 41 VERIFY( if01.good() ); 42 VERIFY( if02.good() ); 43 VERIFY( if03.good() ); 44 45 std::wistream is01(if01.rdbuf()); 46 std::wistream is02(if02.rdbuf()); 47 std::wistream is03(if03.rdbuf()); 48 49 // pos_type tellg() 50 // in | out 51 pos01 = is01.tellg(); 52 pos02 = is01.tellg(); 53 VERIFY( pos01 == pos02 ); 54 55 // in 56 pos03 = is02.tellg(); 57 pos04 = is02.tellg(); 58 VERIFY( pos03 == pos04 ); 59 60 // out 61 pos05 = is03.tellg(); 62 pos06 = is03.tellg(); 63 VERIFY( pos05 == pos06 ); 64 65 // cur 66 // NB: see library issues list 136. It's the v-3 interp that seekg 67 // only sets the input buffer, or else istreams with buffers that 68 // have _M_mode == ios_base::out will fail to have consistency 69 // between seekg and tellg. 70 state01 = is01.rdstate(); 71 is01.seekg(10, std::ios_base::cur); 72 state02 = is01.rdstate(); 73 pos01 = is01.tellg(); 74 VERIFY( pos01 == pos02 + off_type(10) ); 75 VERIFY( state01 == state02 ); 76 pos02 = is01.tellg(); 77 VERIFY( pos02 == pos01 ); 78} 79 80int main() 81{ 82 test04(); 83 return 0; 84} 85