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58 lines
1.5 KiB
C++
Executable file
58 lines
1.5 KiB
C++
Executable file
// 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_CSTREAM_READER_HPP
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#define TAO_PEGTL_INTERNAL_CSTREAM_READER_HPP
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#include <cassert>
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#include <cstddef>
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#include <cstdio>
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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 <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 cstream_reader
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{
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explicit cstream_reader( std::FILE* s ) noexcept
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: m_cstream( s )
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{
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assert( m_cstream != nullptr );
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}
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[[nodiscard]] std::size_t operator()( char* buffer, const std::size_t length ) const
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{
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if( const auto r = std::fread( buffer, 1, length, m_cstream ) ) {
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return r;
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}
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if( std::feof( m_cstream ) != 0 ) {
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return 0;
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}
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// Please contact us if you know how to provoke the following exception.
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// The example on cppreference.com doesn't work, at least not on macOS.
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// LCOV_EXCL_START
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#if defined( __cpp_exceptions )
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const auto ec = std::ferror( m_cstream );
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assert( ec != 0 );
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throw std::system_error( ec, std::system_category(), "std::fread() failed" );
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#else
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std::fputs( "std::fread() failed\n", stderr );
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std::terminate();
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#endif
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// LCOV_EXCL_STOP
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}
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std::FILE* m_cstream;
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};
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} // namespace TAO_PEGTL_NAMESPACE::internal
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#endif
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