CARDS 2.4.140
Package manager for the NuTyX GNU/Linux distribution
console_forwarder.h
1/*
2 * console_forwarder.h
3 *
4 * Copyright 2017 Gianni Peschiutta <artemia@nutyx.org>
5 * Copyright 2017 - 2020 Thierry Nuttens <tnut@nutyx.org>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
20 * MA 02110-1301, USA.
21 *
22 *
23 */
24
25#ifndef CONSOLE_FORWARDER_H
26#define CONSOLE_FORWARDER_H
27
28#include <streambuf>
29#include <iostream>
30#include <ostream>
31
32template <class Elem = char, class Tr = std::char_traits<Elem> >
33
41class console_forwarder : public std::basic_streambuf<Elem, Tr>
42{
43 typedef void (*pfncb)(const Elem *, std::streamsize _Count);
44
45protected:
46 std::basic_ostream<Elem, Tr> &m_stream;
47 std::streambuf *m_buf;
48 pfncb m_cb;
49
50public:
51 console_forwarder(std::ostream &stream, pfncb cb)
52 : m_stream(stream), m_cb(cb)
53 {
54 // redirect stream
55 m_buf = m_stream.rdbuf(this);
56 };
57
59 {
60 // restore stream
61 m_stream.rdbuf(m_buf);
62 }
63
64 // override xsputn and make it forward data to the callback function
65 std::streamsize xsputn(const Elem *_Ptr, std::streamsize _Count)
66 {
67 m_cb(_Ptr, _Count);
68 return _Count;
69 }
70
71 // override overflow and make it forward data to the callback function
72 typename Tr::int_type overflow(typename Tr::int_type v)
73 {
74 Elem ch = Tr::to_char_type(v);
75 m_cb(&ch, 1);
76 return Tr::not_eof(v);
77 }
78};
79
80#endif
Forward standard output console to specific listener.
Definition: console_forwarder.h:42