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59 lines
2.0 KiB
59 lines
2.0 KiB
// (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, n); |
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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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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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