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 pos01 = is01.tellg(); 50 pos02 = is01.tellg(); 51 pos03 = is02.tellg(); 52 pos04 = is02.tellg(); 53 pos05 = is03.tellg(); 54 pos06 = is03.tellg(); 55 56 // istream& seekg(pos_type) 57 // istream& seekg(off_type, ios_base::seekdir) 58 59 // cur 60 // NB: see library issues list 136. It's the v3 interp that seekg 61 // only sets the input buffer, or else istreams with buffers that 62 // have _M_mode == ios_base::out will fail to have consistency 63 // between seekg and tellg. 64 state01 = is01.rdstate(); 65 is01.seekg(10, std::ios_base::cur); 66 state02 = is01.rdstate(); 67 pos01 = is01.tellg(); 68 VERIFY( pos01 == pos02 + off_type(10) ); 69 VERIFY( state01 == state02 ); 70 pos02 = is01.tellg(); 71 VERIFY( pos02 == pos01 ); 72 73 state01 = is02.rdstate(); 74 is02.seekg(10, std::ios_base::cur); 75 state02 = is02.rdstate(); 76 pos03 = is02.tellg(); 77 VERIFY( pos03 == pos04 + off_type(10) ); 78 VERIFY( state01 == state02 ); 79 pos04 = is02.tellg(); 80 VERIFY( pos03 == pos04 ); 81 82 state01 = is03.rdstate(); 83 is03.seekg(10, std::ios_base::cur); 84 state02 = is03.rdstate(); 85 pos05 = is03.tellg(); 86 VERIFY( pos05 == pos06 + off_type(10) ); 87 VERIFY( state01 == state02 ); 88 pos06 = is03.tellg(); 89 VERIFY( pos05 == pos06 ); 90 91 // beg 92 state01 = is01.rdstate(); 93 is01.seekg(20, std::ios_base::beg); 94 state02 = is01.rdstate(); 95 pos01 = is01.tellg(); 96 VERIFY( pos01 == pos02 + off_type(10) ); 97 VERIFY( state01 == state02 ); 98 pos02 = is01.tellg(); 99 VERIFY( pos02 == pos01 ); 100 101 state01 = is02.rdstate(); 102 is02.seekg(20, std::ios_base::beg); 103 state02 = is02.rdstate(); 104 pos03 = is02.tellg(); 105 VERIFY( pos03 == pos04 + off_type(10) ); 106 VERIFY( state01 == state02 ); 107 pos04 = is02.tellg(); 108 VERIFY( pos03 == pos04 ); 109 110 state01 = is03.rdstate(); 111 is03.seekg(20, std::ios_base::beg); 112 state02 = is03.rdstate(); 113 pos05 = is03.tellg(); 114 VERIFY( pos05 == pos06 + off_type(10) ); 115 VERIFY( state01 == state02 ); 116 pos06 = is03.tellg(); 117 VERIFY( pos05 == pos06 ); 118} 119 120int main() 121{ 122 test04(); 123 return 0; 124} 125