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a945c346 | 1 | // Copyright (C) 2004-2024 Free Software Foundation, Inc. |
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2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
748086b7 | 6 | // Free Software Foundation; either version 3, or (at your option) |
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7 | // any later version. |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
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15 | // with this library; see the file COPYING3. If not see |
16 | // <http://www.gnu.org/licenses/>. | |
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18 | // { dg-require-fileio "" } |
19 | ||
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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 | #include <istream> | |
26 | #include <sstream> | |
27 | #include <fstream> | |
28 | #include <testsuite_hooks.h> | |
29 | ||
30 | // fstreams | |
31 | void test04(void) | |
32 | { | |
33 | typedef std::wistream::off_type off_type; | |
34 | ||
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35 | std::wistream::pos_type pos01, pos02, pos03, pos04, pos05, pos06; |
36 | std::ios_base::iostate state01, state02; | |
37 | const char str_lit01[] = "wistream_seeks-1.txt"; | |
38 | const char str_lit02[] = "wistream_seeks-2.txt"; | |
39 | std::wifstream if01(str_lit01, std::ios_base::in | std::ios_base::out); | |
40 | std::wifstream if02(str_lit01, std::ios_base::in); | |
41 | std::wifstream if03(str_lit02, std::ios_base::out | std::ios_base::trunc); | |
42 | VERIFY( if01.good() ); | |
43 | VERIFY( if02.good() ); | |
44 | VERIFY( if03.good() ); | |
45 | ||
46 | std::wistream is01(if01.rdbuf()); | |
47 | std::wistream is02(if02.rdbuf()); | |
48 | std::wistream is03(if03.rdbuf()); | |
49 | ||
50 | pos01 = is01.tellg(); | |
51 | pos02 = is01.tellg(); | |
52 | pos03 = is02.tellg(); | |
53 | pos04 = is02.tellg(); | |
54 | pos05 = is03.tellg(); | |
55 | pos06 = is03.tellg(); | |
56 | ||
57 | // istream& seekg(pos_type) | |
58 | // istream& seekg(off_type, ios_base::seekdir) | |
59 | ||
60 | // cur | |
61 | // NB: see library issues list 136. It's the v3 interp that seekg | |
62 | // only sets the input buffer, or else istreams with buffers that | |
63 | // have _M_mode == ios_base::out will fail to have consistency | |
64 | // between seekg and tellg. | |
65 | state01 = is01.rdstate(); | |
66 | is01.seekg(10, std::ios_base::cur); | |
67 | state02 = is01.rdstate(); | |
68 | pos01 = is01.tellg(); | |
69 | VERIFY( pos01 == pos02 + off_type(10) ); | |
70 | VERIFY( state01 == state02 ); | |
71 | pos02 = is01.tellg(); | |
72 | VERIFY( pos02 == pos01 ); | |
73 | ||
74 | state01 = is02.rdstate(); | |
75 | is02.seekg(10, std::ios_base::cur); | |
76 | state02 = is02.rdstate(); | |
77 | pos03 = is02.tellg(); | |
78 | VERIFY( pos03 == pos04 + off_type(10) ); | |
79 | VERIFY( state01 == state02 ); | |
80 | pos04 = is02.tellg(); | |
81 | VERIFY( pos03 == pos04 ); | |
82 | ||
83 | state01 = is03.rdstate(); | |
84 | is03.seekg(10, std::ios_base::cur); | |
85 | state02 = is03.rdstate(); | |
86 | pos05 = is03.tellg(); | |
87 | VERIFY( pos05 == pos06 + off_type(10) ); | |
88 | VERIFY( state01 == state02 ); | |
89 | pos06 = is03.tellg(); | |
90 | VERIFY( pos05 == pos06 ); | |
91 | ||
92 | // beg | |
93 | state01 = is01.rdstate(); | |
94 | is01.seekg(20, std::ios_base::beg); | |
95 | state02 = is01.rdstate(); | |
96 | pos01 = is01.tellg(); | |
97 | VERIFY( pos01 == pos02 + off_type(10) ); | |
98 | VERIFY( state01 == state02 ); | |
99 | pos02 = is01.tellg(); | |
100 | VERIFY( pos02 == pos01 ); | |
101 | ||
102 | state01 = is02.rdstate(); | |
103 | is02.seekg(20, std::ios_base::beg); | |
104 | state02 = is02.rdstate(); | |
105 | pos03 = is02.tellg(); | |
106 | VERIFY( pos03 == pos04 + off_type(10) ); | |
107 | VERIFY( state01 == state02 ); | |
108 | pos04 = is02.tellg(); | |
109 | VERIFY( pos03 == pos04 ); | |
110 | ||
111 | state01 = is03.rdstate(); | |
112 | is03.seekg(20, std::ios_base::beg); | |
113 | state02 = is03.rdstate(); | |
114 | pos05 = is03.tellg(); | |
115 | VERIFY( pos05 == pos06 + off_type(10) ); | |
116 | VERIFY( state01 == state02 ); | |
117 | pos06 = is03.tellg(); | |
118 | VERIFY( pos05 == pos06 ); | |
119 | } | |
120 | ||
121 | int main() | |
122 | { | |
123 | test04(); | |
124 | return 0; | |
125 | } |