1 | // (C) Copyright Jonathan Turkanis 2005.
|
---|
2 | // Distributed under the Boost Software License, Version 1.0. (See accompanying
|
---|
3 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
|
---|
4 |
|
---|
5 | // See http://www.boost.org/libs/iostreams for documentation.
|
---|
6 |
|
---|
7 | // Based on the work of Christopher Diggins.
|
---|
8 |
|
---|
9 | #ifndef BOOST_IOSTREAMS_STDIO_FILTER_HPP_INCLUDED
|
---|
10 | #define BOOST_IOSTREAMS_STDIO_FILTER_HPP_INCLUDED
|
---|
11 |
|
---|
12 | #if defined(_MSC_VER) && (_MSC_VER >= 1020)
|
---|
13 | # pragma once
|
---|
14 | #endif
|
---|
15 |
|
---|
16 | #include <iostream>
|
---|
17 | #include <memory> // allocator.
|
---|
18 | #include <vector>
|
---|
19 | #include <boost/iostreams/detail/config/wide_streams.hpp>
|
---|
20 | #include <boost/iostreams/detail/char_traits.hpp>
|
---|
21 | #include <boost/iostreams/detail/ios.hpp>
|
---|
22 | #include <boost/iostreams/device/array.hpp>
|
---|
23 | #include <boost/iostreams/device/back_inserter.hpp>
|
---|
24 | #include <boost/iostreams/filter/aggregate.hpp>
|
---|
25 | #include <boost/iostreams/pipeline.hpp>
|
---|
26 | #include <boost/iostreams/stream_buffer.hpp>
|
---|
27 |
|
---|
28 | namespace boost { namespace iostreams {
|
---|
29 |
|
---|
30 | namespace detail {
|
---|
31 |
|
---|
32 | } // End namespace detail.
|
---|
33 |
|
---|
34 | template<typename Ch, typename Alloc = std::allocator<Ch> >
|
---|
35 | class basic_stdio_filter : public aggregate_filter<Ch, Alloc> {
|
---|
36 | private:
|
---|
37 | typedef aggregate_filter<Ch, Alloc> base_type;
|
---|
38 | public:
|
---|
39 | typedef typename base_type::char_type char_type;
|
---|
40 | typedef typename base_type::category category;
|
---|
41 | typedef typename base_type::vector_type vector_type;
|
---|
42 | private:
|
---|
43 | static std::istream& standard_input(char*) { return std::cin; }
|
---|
44 | static std::ostream& standard_output(char*) { return std::cout; }
|
---|
45 | #ifndef BOOST_IOSTREAMS_NO_WIDE_STREAMS
|
---|
46 | static std::wistream& standard_input(wchar_t*) { return std::wcin; }
|
---|
47 | static std::wostream& standard_output(wchar_t*) { return std::wcout; }
|
---|
48 | #endif // BOOST_IOSTREAMS_NO_WIDE_STREAMS
|
---|
49 |
|
---|
50 | struct scoped_redirector { // Thanks to Maxim Egorushkin.
|
---|
51 | typedef BOOST_IOSTREAMS_CHAR_TRAITS(Ch) traits_type;
|
---|
52 | typedef BOOST_IOSTREAMS_BASIC_IOS(Ch, traits_type) ios_type;
|
---|
53 | typedef BOOST_IOSTREAMS_BASIC_STREAMBUF(Ch, traits_type) streambuf_type;
|
---|
54 | scoped_redirector( ios_type& ios,
|
---|
55 | streambuf_type* newbuf )
|
---|
56 | : ios_(ios), old_(ios.rdbuf(newbuf))
|
---|
57 | { }
|
---|
58 | ~scoped_redirector() { ios_.rdbuf(old_); }
|
---|
59 | ios_type& ios_;
|
---|
60 | streambuf_type* old_;
|
---|
61 | };
|
---|
62 |
|
---|
63 | virtual void do_filter() = 0;
|
---|
64 | virtual void do_filter(const vector_type& src, vector_type& dest)
|
---|
65 | {
|
---|
66 | stream_buffer< basic_array_source<Ch> >
|
---|
67 | srcbuf(&src[0], &src[0] + src.size());
|
---|
68 | stream_buffer< back_insert_device<vector_type> >
|
---|
69 | destbuf(iostreams::back_inserter(dest));
|
---|
70 | scoped_redirector redirect_input(standard_input((Ch*)0), &srcbuf);
|
---|
71 | scoped_redirector redirect_output(standard_output((Ch*)0), &destbuf);
|
---|
72 | do_filter();
|
---|
73 | }
|
---|
74 | };
|
---|
75 | BOOST_IOSTREAMS_PIPABLE(basic_stdio_filter, 2)
|
---|
76 |
|
---|
77 | typedef basic_stdio_filter<char> stdio_filter;
|
---|
78 | typedef basic_stdio_filter<wchar_t> wstdio_wfilter;
|
---|
79 |
|
---|
80 | } } // End namespaces iostreams, boost.
|
---|
81 |
|
---|
82 | #endif // #ifndef BOOST_IOSTREAMS_STDIO_FILTER_HPP_INCLUDED
|
---|