libcruft-util/win32/except.cpp

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/*
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* 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, 2017
* Danny Robson <danny@nerdcruft.net>
*/
#include "except.hpp"
#include "../debug.hpp"
using cruft::win32::error;
///////////////////////////////////////////////////////////////////////////////
error::error (DWORD _code):
runtime_error (code_string (_code)),
m_code (_code)
{
CHECK_NEQ (m_code, static_cast<DWORD> (ERROR_SUCCESS));
}
//-----------------------------------------------------------------------------
error::error (void):
error (last_code ())
{ ; }
///////////////////////////////////////////////////////////////////////////////
DWORD
error::code (void) const
{
return m_code;
}
//-----------------------------------------------------------------------------
DWORD
error::last_code (void)
{
return GetLastError ();
}
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///////////////////////////////////////////////////////////////////////////////
HANDLE
error::try_value (HANDLE value)
{
if (value != INVALID_HANDLE_VALUE)
return value;
throw_code ();
}
///////////////////////////////////////////////////////////////////////////////
void
error::try_code (void)
{
try_code (last_code ());
}
//-----------------------------------------------------------------------------
void
error::try_code (DWORD id)
{
if (__builtin_expect (id != ERROR_SUCCESS, false))
throw_code (id);
}
//-----------------------------------------------------------------------------
void
error::throw_code (void)
{
throw_code (last_code ());
}
//-----------------------------------------------------------------------------
void
error::throw_code (DWORD code)
{
CHECK_NEQ (code, static_cast<DWORD> (ERROR_SUCCESS));
throw error (code);
}
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///////////////////////////////////////////////////////////////////////////////
std::string
error::code_string (void)
{
return code_string (last_code ());
}
//-----------------------------------------------------------------------------
std::string
error::code_string (DWORD code)
{
char message[256];
auto res = FormatMessage (
FORMAT_MESSAGE_FROM_SYSTEM,
NULL,
code,
MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
message,
std::size (message),
NULL
);
if (res == 0) {
error::throw_code ();
}
return std::string (message, message + res);
}