libcruft-util/posix/except.cpp

/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * Copyright 2010-2018
 *     Danny Robson <danny@nerdcruft.net>
 */

#include "except.hpp"

#include "../platform.hpp"
#include "../debug/assert.hpp"

#include <cstring>

using cruft::posix::error;


///////////////////////////////////////////////////////////////////////////////
/// Construct an exception object from a given error value.
///
/// The error value MUST be an error at construction time.
error::error (int _code):
    m_code (_code)
{
    CHECK_NEQ (_code, 0);
}


///----------------------------------------------------------------------------
/// Construct an exception object from the current value of errno.
///
/// errno MUST signal an error at construction time.
error::error ():
    error (last_code ())
{
    CHECK_NEQ (m_code, 0);
}


///////////////////////////////////////////////////////////////////////////////
int
error::last_code (void)
{
    return errno;
}


//-----------------------------------------------------------------------------
int
error::code (void) const
{
    return m_code;
}


///////////////////////////////////////////////////////////////////////////////
/// Throw an exception object if errno currently signals an error.
void
error::try_code (void)
{
    try_code (last_code ());
}


///----------------------------------------------------------------------------
/// Throw an exception object if 'code' represents an error.
void
error::try_code (int code)
{
    if (__builtin_expect (code != 0, false))
        throw error (code);
}


///----------------------------------------------------------------------------
void
error::throw_code (void)
{
    throw_code (last_code ());
}


///----------------------------------------------------------------------------
void
error::throw_code (int code)
{
    CHECK_NEQ (code, 0);
    throw error (code);
}


///////////////////////////////////////////////////////////////////////////////
const char*
error::what (void) const noexcept
{
    return strerror (m_code);
}




///////////////////////////////////////////////////////////////////////////////
using cruft::posix::eai;

#if !defined(PLATFORM_WIN32)
#include <netdb.h>
#else
#include <ws2tcpip.h>
#endif


//-----------------------------------------------------------------------------
eai::eai (int code):
    runtime_error (gai_strerror (code)),
    m_code (code)
{ ; }


//-----------------------------------------------------------------------------
int
eai::code (void) const
{
    return m_code;
}


//-----------------------------------------------------------------------------
void
eai::try_code (int code)
{
    if (code)
        throw_code (code);
}


//-----------------------------------------------------------------------------
void
eai::throw_code (int code)
{
    throw eai { code };
}