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// Copyright (c) 2016-2017 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/
#ifndef TAOCPP_PEGTL_INCLUDE_INTERNAL_CSTREAM_READER_HPP
#define TAOCPP_PEGTL_INCLUDE_INTERNAL_CSTREAM_READER_HPP
#include <cstddef>
#include <cstdio>
#include "../config.hpp"
#include "../input_error.hpp"
namespace tao
{
namespace TAOCPP_PEGTL_NAMESPACE
{
namespace internal
{
struct cstream_reader
{
explicit cstream_reader( std::FILE* s ) noexcept
: m_cstream( s )
{
}
std::size_t operator()( char* buffer, const std::size_t length )
{
if( const auto r = std::fread( buffer, 1, length, m_cstream ) ) {
return r;
}
if( std::feof( m_cstream ) != 0 ) {
return 0;
}
// Please contact us if you know how to provoke the following exception.
// The example on cppreference.com doesn't work, at least not on macOS.
TAOCPP_PEGTL_THROW_INPUT_ERROR( "error in fread() from cstream" ); // LCOV_EXCL_LINE
}
std::FILE* m_cstream;
};
} // namespace internal
} // namespace TAOCPP_PEGTL_NAMESPACE
} // namespace tao
#endif
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