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51 lines
1.2 KiB
C++
51 lines
1.2 KiB
C++
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// Copyright (c) 2016-2022 Dr. Colin Hirsch and Daniel Frey
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// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/
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#ifndef TAO_PEGTL_INTERNAL_ISTREAM_READER_HPP
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#define TAO_PEGTL_INTERNAL_ISTREAM_READER_HPP
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#include <istream>
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#if defined( __cpp_exceptions )
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#include <system_error>
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#else
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#include <cstdio>
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#include <exception>
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#endif
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#include "../config.hpp"
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namespace TAO_PEGTL_NAMESPACE::internal
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{
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struct istream_reader
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{
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explicit istream_reader( std::istream& s ) noexcept
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: m_istream( s )
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{}
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[[nodiscard]] std::size_t operator()( char* buffer, const std::size_t length )
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{
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m_istream.read( buffer, std::streamsize( length ) );
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if( const auto r = m_istream.gcount() ) {
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return std::size_t( r );
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}
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if( m_istream.eof() ) {
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return 0;
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}
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#if defined( __cpp_exceptions )
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const auto ec = errno;
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throw std::system_error( ec, std::system_category(), "std::istream::read() failed" );
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#else
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std::fputs( "std::istream::read() failed\n", stderr );
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std::terminate();
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#endif
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}
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std::istream& m_istream;
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};
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} // namespace TAO_PEGTL_NAMESPACE::internal
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#endif
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