1// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
2// (C) Copyright 2005-2007 Jonathan Turkanis
3// Distributed under the Boost Software License, Version 1.0. (See accompanying
4// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
5
6// See http://www.boost.org/libs/iostreams for documentation.
7
8#ifndef BOOST_IOSTREAMS_UNIX2DOS_FILTER_FILTER_HPP_INCLUDED
9#define BOOST_IOSTREAMS_UNIX2DOS_FILTER_FILTER_HPP_INCLUDED
10
11#include <cassert>
12#include <cstdio> // EOF.
13#include <iostream> // cin, cout.
14#include <boost/iostreams/concepts.hpp>
15#include <boost/iostreams/filter/stdio.hpp>
16#include <boost/iostreams/operations.hpp>
17
18namespace boost { namespace iostreams { namespace example {
19
20class unix2dos_stdio_filter : public stdio_filter {
21private:
22 void do_filter()
23 {
24 int c;
25 while ((c = std::cin.get()) != EOF) {
26 if (c == '\n')
27 std::cout.put(c: '\r');
28 std::cout.put(c: c);
29 }
30 }
31};
32
33class unix2dos_input_filter : public input_filter {
34public:
35 unix2dos_input_filter() : has_linefeed_(false) { }
36
37 template<typename Source>
38 int get(Source& src)
39 {
40 if (has_linefeed_) {
41 has_linefeed_ = false;
42 return '\n';
43 }
44
45 int c;
46 if ((c = iostreams::get(src)) == '\n') {
47 has_linefeed_ = true;
48 return '\r';
49 }
50
51 return c;
52 }
53
54 template<typename Source>
55 void close(Source&) { has_linefeed_ = false; }
56private:
57 bool has_linefeed_;
58};
59
60class unix2dos_output_filter : public output_filter {
61public:
62 unix2dos_output_filter() : has_linefeed_(false) { }
63
64 template<typename Sink>
65 bool put(Sink& dest, int c)
66 {
67 if (c == '\n')
68 return has_linefeed_ ?
69 put_char(dest, '\n') :
70 put_char(dest, '\r') ?
71 this->put(dest, '\n') :
72 false;
73 return iostreams::put(dest, c);
74 }
75
76 template<typename Sink>
77 void close(Sink&) { has_linefeed_ = false; }
78private:
79 template<typename Sink>
80 bool put_char(Sink& dest, int c)
81 {
82 bool result;
83 if ((result = iostreams::put(dest, c)) == true) {
84 has_linefeed_ =
85 c == '\r' ?
86 true :
87 c == '\n' ?
88 false :
89 has_linefeed_;
90 }
91 return result;
92 }
93
94 bool has_linefeed_;
95};
96
97} } } // End namespaces example, iostreams, boost.
98
99#endif // #ifndef BOOST_IOSTREAMS_UNIX2DOS_FILTER_FILTER_HPP_INCLUDED
100

source code of boost/libs/iostreams/example/unix2dos_filter.hpp