1// Copyright (C) 2004-2015 Free Software Foundation, Inc.
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// stringstreams
29void test05(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.tst";
37  std::wifstream if01(str_lit01);
38  std::wifstream if02(str_lit01);
39  std::wifstream if03(str_lit01);
40  VERIFY( if01.good() );
41  VERIFY( if02.good() );
42  VERIFY( if03.good() );
43
44  std::wstringbuf strbuf01(std::ios_base::in | std::ios_base::out);
45  if01 >> &strbuf01;
46  // initialize stringbufs that are ios_base::out
47  std::wstringbuf strbuf03(strbuf01.str(), std::ios_base::out);
48  // initialize stringbufs that are ios_base::in
49  std::wstringbuf strbuf02(strbuf01.str(), std::ios_base::in);
50
51  std::wistream is01(&strbuf01);
52  std::wistream is02(&strbuf02);
53  std::wistream is03(&strbuf03);
54
55  // pos_type tellg()
56  // in | out
57  pos01 = is01.tellg();
58  pos02 = is01.tellg();
59  VERIFY( pos01 == pos02 );
60
61  // in
62  pos03 = is02.tellg();
63  pos04 = is02.tellg();
64  VERIFY( pos03 == pos04 );
65
66  // out
67  pos05 = is03.tellg();
68  pos06 = is03.tellg();
69  VERIFY( pos05 == pos06 );
70
71  // cur
72  // NB: see library issues list 136. It's the v-3 interp that seekg
73  // only sets the input buffer, or else istreams with buffers that
74  // have _M_mode == ios_base::out will fail to have consistency
75  // between seekg and tellg.
76  state01 = is01.rdstate();
77  is01.seekg(10, std::ios_base::cur);
78  state02 = is01.rdstate();
79  pos01 = is01.tellg();
80  VERIFY( pos01 == pos02 + off_type(10) );
81  VERIFY( state01 == state02 );
82  pos02 = is01.tellg();
83  VERIFY( pos02 == pos01 );
84}
85
86int main()
87{
88  test05();
89  return 0;
90}
91