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a945c346 | 1 | // Copyright (C) 2017-2024 Free Software Foundation, Inc. |
fddcd19a JW |
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 | ||
1f78c47b | 18 | // { dg-require-fileio "" } |
fddcd19a JW |
19 | |
20 | // PR libstdc++/81395 | |
21 | ||
22 | #include <fstream> | |
23 | #include <cstring> // for std::memset | |
24 | #include <cstdio> // For BUFSIZ | |
25 | ||
26 | using std::memset; | |
27 | ||
28 | int main() | |
29 | { | |
30 | { | |
31 | std::filebuf fb; | |
32 | fb.open("test.txt", std::ios::out); | |
33 | char data[BUFSIZ]; | |
34 | memset(data, 'A', sizeof(data)); | |
35 | fb.sputn(data, sizeof(data)); | |
36 | } | |
37 | ||
38 | std::filebuf fb; | |
39 | fb.open("test.txt", std::ios::in|std::ios::out); | |
40 | char buf[BUFSIZ]; | |
41 | memset(buf, 0, sizeof(buf)); | |
42 | fb.sgetn(buf, sizeof(buf)); | |
43 | // Switch from reading to writing without seeking first: | |
44 | fb.sputn("B", 1); | |
45 | fb.pubsync(); | |
46 | } |