ext-boost/boost/system/detail/generic_category.hpp
2019-08-24 15:39:04 +02:00

102 lines
2.1 KiB
C++

// Implementation details of generic_error_category
//
// Copyright 2018 Peter Dimov
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// See library home page at http://www.boost.org/libs/system
#include <cstring>
namespace boost
{
namespace system
{
namespace detail
{
#if defined(__GLIBC__)
// glibc has two incompatible strerror_r definitions
inline char const * strerror_r_helper( char const * r, char const * ) BOOST_NOEXCEPT
{
return r;
}
inline char const * strerror_r_helper( int r, char const * buffer ) BOOST_NOEXCEPT
{
return r == 0? buffer: "Unknown error";
}
inline char const * generic_error_category_message( int ev, char * buffer, std::size_t len ) BOOST_NOEXCEPT
{
return strerror_r_helper( strerror_r( ev, buffer, len ), buffer );
}
inline std::string generic_error_category_message( int ev )
{
char buffer[ 128 ];
return generic_error_category_message( ev, buffer, sizeof( buffer ) );
}
#else
// std::strerror is thread-safe on everything else, incl. Windows
# if defined( BOOST_MSVC )
# pragma warning( push )
# pragma warning( disable: 4996 )
# elif defined(__clang__) && defined(__has_warning)
# pragma clang diagnostic push
# if __has_warning("-Wdeprecated-declarations")
# pragma clang diagnostic ignored "-Wdeprecated-declarations"
# endif
# endif
inline std::string generic_error_category_message( int ev )
{
char const * m = std::strerror( ev );
return m? m: "Unknown error";
}
inline char const * generic_error_category_message( int ev, char * buffer, std::size_t len ) BOOST_NOEXCEPT
{
if( len == 0 )
{
return buffer;
}
if( len == 1 )
{
buffer[0] = 0;
return buffer;
}
char const * m = std::strerror( ev );
if( m == 0 ) return "Unknown error";
std::strncpy( buffer, m, len - 1 );
buffer[ len-1 ] = 0;
return buffer;
}
# if defined( BOOST_MSVC )
# pragma warning( pop )
# elif defined(__clang__) && defined(__has_warning)
# pragma clang diagnostic pop
# endif
#endif
} // namespace detail
} // namespace system
} // namespace boost