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63 lines
2.2 KiB
63 lines
2.2 KiB
3 years ago
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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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// (C) Copyright 2005-2007 Jonathan Turkanis
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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// See http://www.boost.org/libs/iostreams for documentation.
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#ifndef BOOST_IOSTREAMS_DETAIL_NON_BLOCKING_ADAPTER_HPP_INCLUDED
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#define BOOST_IOSTREAMS_DETAIL_NON_BLOCKING_ADAPTER_HPP_INCLUDED
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#include <boost/iostreams/detail/ios.hpp> // streamsize, seekdir, openmode.
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#include <boost/iostreams/read.hpp>
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#include <boost/iostreams/seek.hpp>
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#include <boost/iostreams/traits.hpp>
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#include <boost/iostreams/write.hpp>
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namespace boost { namespace iostreams {
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template<typename Device>
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class non_blocking_adapter {
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public:
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typedef typename char_type_of<Device>::type char_type;
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struct category
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: mode_of<Device>::type, device_tag
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{ };
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explicit non_blocking_adapter(Device& dev) : device_(dev) { }
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std::streamsize read(char_type* s, std::streamsize n)
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{
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std::streamsize result = 0;
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while (result < n) {
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std::streamsize amt = iostreams::read(device_, s + result, n - result);
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if (amt == -1)
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break;
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result += amt;
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}
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return result != 0 ? result : -1;
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}
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std::streamsize write(const char_type* s, std::streamsize n)
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{
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std::streamsize result = 0;
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while (result < n) {
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std::streamsize amt =
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iostreams::write(device_, s + result, n - result);
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// write errors, like EOF on read, need to be handled.
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if (amt == -1)
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break;
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result += amt;
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}
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return result;
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}
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std::streampos seek( stream_offset off, BOOST_IOS::seekdir way,
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BOOST_IOS::openmode which =
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BOOST_IOS::in | BOOST_IOS::out )
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{ return iostreams::seek(device_, off, way, which); }
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public:
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non_blocking_adapter& operator=(const non_blocking_adapter&);
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Device& device_;
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};
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} } // End namespace iostreams.
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#endif // #ifndef BOOST_IOSTREAMS_DETAIL_NON_BLOCKING_ADAPTER_HPP_INCLUDED
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