3 // Copyright (C) 2000, 2001, 2002, 2003 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 2, 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 COPYING. If not, write to the Free
18 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
21 // 27.6.1.3 unformatted input functions
22 // NB: ostream has a particular "seeks" category. Adopt this for istreams too.
23 // @require@ %-*.tst %-*.txt
24 // @diff@ %-*.tst %-*.txt
26 // { dg-require-fileio "" }
31 #include <testsuite_hooks.h>
36 typedef std::istream::off_type off_type;
38 bool test __attribute__((unused)) = true;
39 std::istream::pos_type pos01, pos02, pos03, pos04, pos05, pos06;
40 std::ios_base::iostate state01, state02;
41 const char str_lit01[] = "istream_seeks-1.txt";
42 const char str_lit02[] = "istream_seeks-2.txt";
43 std::ifstream if01(str_lit01, std::ios_base::in | std::ios_base::out);
44 std::ifstream if02(str_lit01, std::ios_base::in);
45 std::ifstream if03(str_lit02, std::ios_base::out | std::ios_base::trunc);
46 VERIFY( if01.good() );
47 VERIFY( if02.good() );
48 VERIFY( if03.good() );
50 std::istream is01(if01.rdbuf());
51 std::istream is02(if02.rdbuf());
52 std::istream is03(if03.rdbuf());
61 // istream& seekg(pos_type)
62 // istream& seekg(off_type, ios_base::seekdir)
65 // NB: see library issues list 136. It's the v-3 interp that seekg
66 // only sets the input buffer, or else istreams with buffers that
67 // have _M_mode == ios_base::out will fail to have consistency
68 // between seekg and tellg.
69 state01 = is01.rdstate();
70 is01.seekg(10, std::ios_base::cur);
71 state02 = is01.rdstate();
73 VERIFY( pos01 == pos02 + off_type(10) );
74 VERIFY( state01 == state02 );
76 VERIFY( pos02 == pos01 );
78 state01 = is02.rdstate();
79 is02.seekg(10, std::ios_base::cur);
80 state02 = is02.rdstate();
82 VERIFY( pos03 == pos04 + off_type(10) );
83 VERIFY( state01 == state02 );
85 VERIFY( pos03 == pos04 );
87 state01 = is03.rdstate();
88 is03.seekg(10, std::ios_base::cur);
89 state02 = is03.rdstate();
91 VERIFY( pos05 == pos06 + off_type(10) );
92 VERIFY( state01 == state02 );
94 VERIFY( pos05 == pos06 );
97 state01 = is01.rdstate();
98 is01.seekg(20, std::ios_base::beg);
99 state02 = is01.rdstate();
100 pos01 = is01.tellg();
101 VERIFY( pos01 == pos02 + off_type(10) );
102 VERIFY( state01 == state02 );
103 pos02 = is01.tellg();
104 VERIFY( pos02 == pos01 );
106 state01 = is02.rdstate();
107 is02.seekg(20, std::ios_base::beg);
108 state02 = is02.rdstate();
109 pos03 = is02.tellg();
110 VERIFY( pos03 == pos04 + off_type(10) );
111 VERIFY( state01 == state02 );
112 pos04 = is02.tellg();
113 VERIFY( pos03 == pos04 );
115 state01 = is03.rdstate();
116 is03.seekg(20, std::ios_base::beg);
117 state02 = is03.rdstate();
118 pos05 = is03.tellg();
119 VERIFY( pos05 == pos06 + off_type(10) );
120 VERIFY( state01 == state02 );
121 pos06 = is03.tellg();
122 VERIFY( pos05 == pos06 );