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a5544970 | 1 | // Copyright (C) 2010-2019 Free Software Foundation, Inc. |
3531cf5e DK |
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 | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
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 | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
18 | // { dg-require-fileio "" } | |
19 | ||
20 | #include <fstream> | |
21 | #include <testsuite_hooks.h> | |
22 | ||
23 | const char name_01[] = "tmp_seekoff_45628.tst"; | |
24 | ||
25 | unsigned underflows, overflows; | |
26 | ||
27 | class my_filebuf | |
28 | : public std::filebuf | |
29 | { | |
30 | virtual int_type | |
31 | underflow() | |
32 | { | |
33 | ++underflows; | |
34 | return std::filebuf::underflow(); | |
35 | } | |
36 | virtual int_type | |
37 | overflow(int_type c) | |
38 | { | |
39 | ++overflows; | |
40 | return std::filebuf::overflow(c); | |
41 | } | |
42 | }; | |
43 | ||
44 | // libstdc++/45628 | |
45 | void test01() | |
46 | { | |
3531cf5e DK |
47 | my_filebuf q; |
48 | q.open(name_01, std::ios_base::in | std::ios_base::out | |
49 | | std::ios_base::trunc); | |
50 | ||
51 | q.sputc('a'); | |
52 | q.pubseekoff(0, std::ios_base::cur); | |
53 | q.sputc('b'); | |
54 | q.pubseekoff(0, std::ios_base::cur); | |
55 | q.sputc('c'); | |
56 | q.pubseekoff(0, std::ios_base::cur); | |
57 | ||
58 | VERIFY( overflows <= 1 ); // only initial sputc allowed to overflow | |
59 | q.pubseekoff(0, std::ios_base::beg); | |
60 | ||
61 | q.sbumpc(); | |
62 | VERIFY( underflows == 1 ); | |
63 | ||
64 | q.pubseekoff(0, std::ios_base::cur); | |
65 | q.sbumpc(); | |
66 | q.pubseekoff(0, std::ios_base::cur); | |
67 | q.sbumpc(); | |
68 | q.pubseekoff(0, std::ios_base::cur); | |
69 | ||
70 | VERIFY( underflows == 1 ); | |
71 | } | |
72 | ||
73 | int main() | |
74 | { | |
75 | test01(); | |
76 | return 0; | |
77 | } |