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
28 #include <testsuite_hooks.h>
33 typedef std::istream::off_type off_type;
35 bool test __attribute__((unused)) = true;
36 std::wistream::pos_type pos01, pos02, pos03, pos04, pos05, pos06;
37 std::ios_base::iostate state01, state02;
38 const char str_lit01[] = "wistream_seeks-1.tst";
39 std::wifstream if01(str_lit01);
40 std::wifstream if02(str_lit01);
41 std::wifstream if03(str_lit01);
42 VERIFY( if01.good() );
43 VERIFY( if02.good() );
44 VERIFY( if03.good() );
46 std::wstringbuf strbuf01(std::ios_base::in | std::ios_base::out);
48 // initialize stringbufs that are ios_base::out
49 std::wstringbuf strbuf03(strbuf01.str(), std::ios_base::out);
50 // initialize stringbufs that are ios_base::in
51 std::wstringbuf strbuf02(strbuf01.str(), std::ios_base::in);
53 std::wistream is01(&strbuf01);
54 std::wistream is02(&strbuf02);
55 std::wistream is03(&strbuf03);
66 // istream& seekg(pos_type)
67 // istream& seekg(off_type, ios_base::seekdir)
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();
78 VERIFY( pos01 == pos02 + off_type(10) );
79 VERIFY( state01 == state02 );
81 VERIFY( pos02 == pos01 );
83 state01 = is02.rdstate();
84 is02.seekg(10, std::ios_base::cur);
85 state02 = is02.rdstate();
87 VERIFY( pos03 == pos04 + off_type(10) );
88 VERIFY( state01 == state02 );
90 VERIFY( pos03 == pos04 );
92 state01 = is03.rdstate();
93 is03.seekg(10, std::ios_base::cur);
94 state02 = is03.rdstate();
96 VERIFY( pos05 == pos06 ); // as only out buffer
97 VERIFY( state01 != state02 );
99 VERIFY( pos05 == pos06 );
102 state01 = is01.rdstate();
103 is01.seekg(20, std::ios_base::beg);
104 state02 = is01.rdstate();
105 pos01 = is01.tellg();
106 VERIFY( pos01 == pos02 + off_type(10) );
107 VERIFY( state01 == state02 );
108 pos02 = is01.tellg();
109 VERIFY( pos02 == pos01 );
111 state01 = is02.rdstate();
112 is02.seekg(20, std::ios_base::beg);
113 state02 = is02.rdstate();
114 pos03 = is02.tellg();
115 VERIFY( pos03 == pos04 + off_type(10) );
116 VERIFY( state01 == state02 );
117 pos04 = is02.tellg();
118 VERIFY( pos03 == pos04 );
120 state01 = is03.rdstate();
121 is03.seekg(20, std::ios_base::beg);
122 state02 = is03.rdstate();
123 pos05 = is03.tellg();
124 VERIFY( pos05 == pos06 ); // as only out buffer
125 VERIFY( state01 == state02 );
126 pos06 = is03.tellg();
127 VERIFY( pos05 == pos06 );