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1 | // 2000-06-29 bkoz |
2 | ||
a5544970 | 3 | // Copyright (C) 2000-2019 Free Software Foundation, Inc. |
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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 | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
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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 | |
748086b7 JJ |
17 | // with this library; see the file COPYING3. If not see |
18 | // <http://www.gnu.org/licenses/>. | |
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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 | ||
0c20e4ec NS |
25 | // { dg-require-fileio "" } |
26 | ||
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27 | #include <istream> |
28 | #include <sstream> | |
29 | #include <fstream> | |
30 | #include <testsuite_hooks.h> | |
31 | ||
32 | // fstreams | |
33 | void test04(void) | |
34 | { | |
35 | typedef std::istream::off_type off_type; | |
36 | ||
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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 | pos01 = is01.tellg(); | |
53 | pos02 = is01.tellg(); | |
54 | pos03 = is02.tellg(); | |
55 | pos04 = is02.tellg(); | |
56 | pos05 = is03.tellg(); | |
57 | pos06 = is03.tellg(); | |
58 | ||
59 | // istream& seekg(pos_type) | |
60 | // istream& seekg(off_type, ios_base::seekdir) | |
61 | ||
62 | // cur | |
63 | // NB: see library issues list 136. It's the v-3 interp that seekg | |
64 | // only sets the input buffer, or else istreams with buffers that | |
65 | // have _M_mode == ios_base::out will fail to have consistency | |
66 | // between seekg and tellg. | |
67 | state01 = is01.rdstate(); | |
68 | is01.seekg(10, std::ios_base::cur); | |
69 | state02 = is01.rdstate(); | |
70 | pos01 = is01.tellg(); | |
71 | VERIFY( pos01 == pos02 + off_type(10) ); | |
72 | VERIFY( state01 == state02 ); | |
73 | pos02 = is01.tellg(); | |
74 | VERIFY( pos02 == pos01 ); | |
75 | ||
76 | state01 = is02.rdstate(); | |
77 | is02.seekg(10, std::ios_base::cur); | |
78 | state02 = is02.rdstate(); | |
79 | pos03 = is02.tellg(); | |
80 | VERIFY( pos03 == pos04 + off_type(10) ); | |
81 | VERIFY( state01 == state02 ); | |
82 | pos04 = is02.tellg(); | |
83 | VERIFY( pos03 == pos04 ); | |
84 | ||
85 | state01 = is03.rdstate(); | |
86 | is03.seekg(10, std::ios_base::cur); | |
87 | state02 = is03.rdstate(); | |
88 | pos05 = is03.tellg(); | |
89 | VERIFY( pos05 == pos06 + off_type(10) ); | |
90 | VERIFY( state01 == state02 ); | |
91 | pos06 = is03.tellg(); | |
92 | VERIFY( pos05 == pos06 ); | |
93 | ||
94 | // beg | |
95 | state01 = is01.rdstate(); | |
96 | is01.seekg(20, std::ios_base::beg); | |
97 | state02 = is01.rdstate(); | |
98 | pos01 = is01.tellg(); | |
99 | VERIFY( pos01 == pos02 + off_type(10) ); | |
100 | VERIFY( state01 == state02 ); | |
101 | pos02 = is01.tellg(); | |
102 | VERIFY( pos02 == pos01 ); | |
103 | ||
104 | state01 = is02.rdstate(); | |
105 | is02.seekg(20, std::ios_base::beg); | |
106 | state02 = is02.rdstate(); | |
107 | pos03 = is02.tellg(); | |
108 | VERIFY( pos03 == pos04 + off_type(10) ); | |
109 | VERIFY( state01 == state02 ); | |
110 | pos04 = is02.tellg(); | |
111 | VERIFY( pos03 == pos04 ); | |
112 | ||
113 | state01 = is03.rdstate(); | |
114 | is03.seekg(20, std::ios_base::beg); | |
115 | state02 = is03.rdstate(); | |
116 | pos05 = is03.tellg(); | |
117 | VERIFY( pos05 == pos06 + off_type(10) ); | |
118 | VERIFY( state01 == state02 ); | |
119 | pos06 = is03.tellg(); | |
120 | VERIFY( pos05 == pos06 ); | |
121 | } | |
122 | ||
123 | int main() | |
124 | { | |
125 | test04(); | |
126 | return 0; | |
127 | } |