3 // Copyright (C) 2000, 2001, 2002, 2003, 2009 Free Software Foundation
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)
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.
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/>.
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
25 // { dg-require-fileio "" }
30 #include <testsuite_hooks.h>
35 typedef std::istream::off_type off_type;
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.tst";
41 std::ifstream if01(str_lit01);
42 std::ifstream if02(str_lit01);
43 std::ifstream if03(str_lit01);
44 VERIFY( if01.good() );
45 VERIFY( if02.good() );
46 VERIFY( if03.good() );
48 std::stringbuf strbuf01(std::ios_base::in | std::ios_base::out);
50 // initialize stringbufs that are ios_base::out
51 std::stringbuf strbuf03(strbuf01.str(), std::ios_base::out);
52 // initialize stringbufs that are ios_base::in
53 std::stringbuf strbuf02(strbuf01.str(), std::ios_base::in);
55 std::istream is01(&strbuf01);
56 std::istream is02(&strbuf02);
57 std::istream is03(&strbuf03);
68 // istream& seekg(pos_type)
69 // istream& seekg(off_type, ios_base::seekdir)
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();
80 VERIFY( pos01 == pos02 + off_type(10) );
81 VERIFY( state01 == state02 );
83 VERIFY( pos02 == pos01 );
85 state01 = is02.rdstate();
86 is02.seekg(10, std::ios_base::cur);
87 state02 = is02.rdstate();
89 VERIFY( pos03 == pos04 + off_type(10) );
90 VERIFY( state01 == state02 );
92 VERIFY( pos03 == pos04 );
94 state01 = is03.rdstate();
95 is03.seekg(10, std::ios_base::cur);
96 state02 = is03.rdstate();
98 VERIFY( pos05 == pos06 ); // as only out buffer
99 VERIFY( state01 != state02 );
100 pos06 = is03.tellg();
101 VERIFY( pos05 == pos06 );
104 state01 = is01.rdstate();
105 is01.seekg(20, std::ios_base::beg);
106 state02 = is01.rdstate();
107 pos01 = is01.tellg();
108 VERIFY( pos01 == pos02 + off_type(10) );
109 VERIFY( state01 == state02 );
110 pos02 = is01.tellg();
111 VERIFY( pos02 == pos01 );
113 state01 = is02.rdstate();
114 is02.seekg(20, std::ios_base::beg);
115 state02 = is02.rdstate();
116 pos03 = is02.tellg();
117 VERIFY( pos03 == pos04 + off_type(10) );
118 VERIFY( state01 == state02 );
119 pos04 = is02.tellg();
120 VERIFY( pos03 == pos04 );
122 state01 = is03.rdstate();
123 is03.seekg(20, std::ios_base::beg);
124 state02 = is03.rdstate();
125 pos05 = is03.tellg();
126 VERIFY( pos05 == pos06 ); // as only out buffer
127 VERIFY( state01 == state02 );
128 pos06 = is03.tellg();
129 VERIFY( pos05 == pos06 );