#ifndef BOOST_SYSTEM_DETAIL_GENERIC_CATEGORY_MESSAGE_HPP_INCLUDED
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#define BOOST_SYSTEM_DETAIL_GENERIC_CATEGORY_MESSAGE_HPP_INCLUDED
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// Implementation of generic_error_category_message
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//
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// Copyright 2018 Peter Dimov
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//
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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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//
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// See library home page at http://www.boost.org/libs/system
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#include <boost/config.hpp>
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#include <string>
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#include <cstring>
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namespace boost
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{
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namespace system
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{
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namespace detail
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{
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#if defined(__GLIBC__)
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// glibc has two incompatible strerror_r definitions
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inline char const * strerror_r_helper( char const * r, char const * ) BOOST_NOEXCEPT
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{
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return r;
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}
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inline char const * strerror_r_helper( int r, char const * buffer ) BOOST_NOEXCEPT
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{
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return r == 0? buffer: "Unknown error";
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}
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inline char const * generic_error_category_message( int ev, char * buffer, std::size_t len ) BOOST_NOEXCEPT
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{
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return strerror_r_helper( strerror_r( ev, buffer, len ), buffer );
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}
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inline std::string generic_error_category_message( int ev )
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{
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char buffer[ 128 ];
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return generic_error_category_message( ev, buffer, sizeof( buffer ) );
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}
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#else // #if defined(__GLIBC__)
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// std::strerror is thread-safe on everything else, incl. Windows
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# if defined( BOOST_MSVC )
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# pragma warning( push )
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# pragma warning( disable: 4996 )
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# elif defined(__clang__) && defined(__has_warning)
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# pragma clang diagnostic push
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# if __has_warning("-Wdeprecated-declarations")
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# pragma clang diagnostic ignored "-Wdeprecated-declarations"
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# endif
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# endif
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inline std::string generic_error_category_message( int ev )
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{
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char const * m = std::strerror( ev );
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return m? m: "Unknown error";
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}
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inline char const * generic_error_category_message( int ev, char * buffer, std::size_t len ) BOOST_NOEXCEPT
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{
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if( len == 0 )
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{
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return buffer;
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}
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if( len == 1 )
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{
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buffer[0] = 0;
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return buffer;
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}
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char const * m = std::strerror( ev );
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if( m == 0 ) return "Unknown error";
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std::strncpy( buffer, m, len - 1 );
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buffer[ len-1 ] = 0;
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return buffer;
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}
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# if defined( BOOST_MSVC )
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# pragma warning( pop )
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# elif defined(__clang__) && defined(__has_warning)
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# pragma clang diagnostic pop
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# endif
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#endif // #if defined(__GLIBC__)
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} // namespace detail
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} // namespace system
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} // namespace boost
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#endif // #ifndef BOOST_SYSTEM_DETAIL_GENERIC_CATEGORY_MESSAGE_HPP_INCLUDED
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