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