libcruft-util/posix/except.cpp

100 lines
2.3 KiB
C++

/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2010, 2017,
* Danny Robson <danny@nerdcruft.net>
*/
#include "except.hpp"
#include "../debug.hpp"
#include <cstring>
using util::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):
std::runtime_error (::strerror (_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);
}