1 // 2000-06-29 bkoz
2
3 // Copyright (C) 2000-2018 Free Software Foundation, Inc.
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
test04(void)33 void test04(void)
34 {
35 typedef std::istream::off_type off_type;
36
37 std::istream::pos_type pos01, pos02, pos03, pos04, pos05, pos06;
38 std::ios_base::iostate state01, state02;
39 const char str_lit01[] = "istream_seeks-1.txt";
40 const char str_lit02[] = "istream_seeks-2.txt";
41 std::ifstream if01(str_lit01, std::ios_base::in | std::ios_base::out);
42 std::ifstream if02(str_lit01, std::ios_base::in);
43 std::ifstream if03(str_lit02, std::ios_base::out | std::ios_base::trunc);
44 VERIFY( if01.good() );
45 VERIFY( if02.good() );
46 VERIFY( if03.good() );
47
48 std::istream is01(if01.rdbuf());
49 std::istream is02(if02.rdbuf());
50 std::istream is03(if03.rdbuf());
51
52 // pos_type tellg()
53 // in | out
54 pos01 = is01.tellg();
55 pos02 = is01.tellg();
56 VERIFY( pos01 == pos02 );
57
58 // in
59 pos03 = is02.tellg();
60 pos04 = is02.tellg();
61 VERIFY( pos03 == pos04 );
62
63 // out
64 pos05 = is03.tellg();
65 pos06 = is03.tellg();
66 VERIFY( pos05 == pos06 );
67
68 // cur
69 // NB: see library issues list 136. It's the v-3 interp that seekg
70 // only sets the input buffer, or else istreams with buffers that
71 // have _M_mode == ios_base::out will fail to have consistency
72 // between seekg and tellg.
73 state01 = is01.rdstate();
74 is01.seekg(10, std::ios_base::cur);
75 state02 = is01.rdstate();
76 pos01 = is01.tellg();
77 VERIFY( pos01 == pos02 + off_type(10) );
78 VERIFY( state01 == state02 );
79 pos02 = is01.tellg();
80 VERIFY( pos02 == pos01 );
81 }
82
main()83 int main()
84 {
85 test04();
86 return 0;
87 }
88