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1 | // { dg-require-fileio "" } |
2 | ||
83ffe9cd | 3 | // Copyright (C) 2010-2023 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 | |
8 | // Free Software Foundation; either version 3, or (at your option) | |
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 | |
17 | // with this library; see the file COPYING3. If not see | |
18 | // <http://www.gnu.org/licenses/>. | |
19 | ||
20 | // 27.8.1.4 Overridden virtual functions | |
21 | ||
22 | #include <fstream> | |
23 | #include <cstring> | |
24 | #include <testsuite_hooks.h> | |
25 | ||
26 | void test01() | |
27 | { | |
28 | using namespace std; | |
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29 | |
30 | typedef filebuf::pos_type pos_type; | |
31 | const char name[] = "tmp_seekoff-4.tst"; | |
32 | ||
3531cf5e | 33 | const size_t size = 12; |
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34 | char buf[size]; |
35 | streamsize n; | |
36 | ||
37 | filebuf fb; | |
38 | fb.open(name, ios_base::in | ios_base::out | ios_base::trunc); | |
39 | ||
40 | n = fb.sputn("abcd", 4); | |
41 | VERIFY( n == 4 ); | |
42 | ||
43 | fb.pubseekoff(0, ios_base::beg); | |
44 | n = fb.sgetn(buf, 3); | |
45 | VERIFY( n == 3 ); | |
46 | VERIFY( !memcmp(buf, "abc", 3) ); | |
47 | ||
3531cf5e | 48 | // Check read => write without pubseekoff(0, ios_base::cur) |
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49 | |
50 | n = fb.sputn("ef", 2); | |
51 | VERIFY( n == 2 ); | |
52 | ||
53 | fb.pubseekoff(0, ios_base::beg); | |
54 | ||
55 | n = fb.sgetn(buf, size); | |
56 | VERIFY( n == 5 ); | |
57 | VERIFY( !memcmp(buf, "abcef", 5) ); | |
58 | ||
59 | fb.pubseekoff(0, ios_base::beg); | |
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60 | n = fb.sputn("gh", 2); |
61 | VERIFY( n == 2 ); | |
62 | ||
63 | // Check write => read without pubseekoff(0, ios_base::cur) | |
64 | ||
65 | n = fb.sgetn( buf, 3 ); | |
66 | VERIFY( !memcmp(buf, "cef", 3) ); | |
fe093419 | 67 | |
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68 | n = fb.sputn("ijkl", 4); |
69 | VERIFY( n == 4 ); | |
70 | ||
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71 | fb.pubseekoff(0, ios_base::beg); |
72 | n = fb.sgetn(buf, 2); | |
73 | VERIFY( n == 2 ); | |
74 | VERIFY( !memcmp(buf, "gh", 2) ); | |
75 | ||
76 | fb.pubseekoff(0, ios_base::end); | |
77 | n = fb.sputn("mno", 3); | |
78 | VERIFY( n == 3 ); | |
79 | ||
80 | fb.pubseekoff(0, ios_base::beg); | |
81 | n = fb.sgetn(buf, size); | |
3531cf5e DK |
82 | VERIFY( n == 12 ); |
83 | VERIFY( !memcmp(buf, "ghcefijklmno", 12) ); | |
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84 | |
85 | fb.close(); | |
86 | } | |
87 | ||
88 | int main() | |
89 | { | |
90 | test01(); | |
91 | return 0; | |
92 | } |