1// 2000-06-29 bkoz
2
3// Copyright (C) 2000, 2001, 2002, 2003, 2009 Free Software Foundation
4//
5// This file is part of the GNU ISO C++ Library.  This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14// GNU General Public License for more details.
15
16// You should have received a copy of the GNU General Public License along
17// with this library; see the file COPYING3.  If not see
18// <http://www.gnu.org/licenses/>.
19
20// 27.6.1.3 unformatted input functions
21// NB: ostream has a particular "seeks" category. Adopt this for istreams too.
22// @require@ %-*.tst %-*.txt
23// @diff@ %-*.tst %-*.txt
24
25// { dg-require-fileio "" }
26
27#include <istream>
28#include <sstream>
29#include <fstream>
30#include <testsuite_hooks.h>
31
32// fstreams
33void test04(void)
34{
35  typedef std::istream::off_type off_type;
36
37  bool test __attribute__((unused)) = true;
38  std::istream::pos_type pos01, pos02, pos03, pos04, pos05, pos06;
39  std::ios_base::iostate state01, state02;
40  const char str_lit01[] = "istream_seeks-1.txt";
41  const char str_lit02[] = "istream_seeks-2.txt";
42  std::ifstream if01(str_lit01, std::ios_base::in | std::ios_base::out);
43  std::ifstream if02(str_lit01, std::ios_base::in);
44  std::ifstream if03(str_lit02, std::ios_base::out | std::ios_base::trunc);
45  VERIFY( if01.good() );
46  VERIFY( if02.good() );
47  VERIFY( if03.good() );
48
49  std::istream is01(if01.rdbuf());
50  std::istream is02(if02.rdbuf());
51  std::istream is03(if03.rdbuf());
52
53  // pos_type tellg()
54  // in | out
55  pos01 = is01.tellg();
56  pos02 = is01.tellg();
57  VERIFY( pos01 == pos02 );
58
59  // in
60  pos03 = is02.tellg();
61  pos04 = is02.tellg();
62  VERIFY( pos03 == pos04 );
63
64  // out
65  pos05 = is03.tellg();
66  pos06 = is03.tellg();
67  VERIFY( pos05 == pos06 );
68
69  // cur
70  // NB: see library issues list 136. It's the v-3 interp that seekg
71  // only sets the input buffer, or else istreams with buffers that
72  // have _M_mode == ios_base::out will fail to have consistency
73  // between seekg and tellg.
74  state01 = is01.rdstate();
75  is01.seekg(10, std::ios_base::cur);
76  state02 = is01.rdstate();
77  pos01 = is01.tellg();
78  VERIFY( pos01 == pos02 + off_type(10) );
79  VERIFY( state01 == state02 );
80  pos02 = is01.tellg();
81  VERIFY( pos02 == pos01 );
82}
83
84int main()
85{
86  test04();
87  return 0;
88}
89