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/*
* Copyright 2020-2021 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "HResult.hxx"
#include "system/Error.hxx"
#include <cassert>
#include <cstdarg>
#include <cstdio>
#include <memory>
std::string
HResultCategory::message(int Errcode) const
{
char buffer[256];
/* FormatMessage() supports some HRESULT values (depending on
the Windows version) */
if (FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
nullptr, Errcode, 0,
buffer, sizeof(buffer),
nullptr))
return buffer;
const auto msg = HRESULTToString(Errcode);
if (!msg.empty())
return std::string(msg);
int size = snprintf(buffer, sizeof(buffer), "0x%1x", Errcode);
assert(2 <= size && size <= 10);
return std::string(buffer, size);
}
std::system_error
FormatHResultError(HRESULT result, const char *fmt, ...) noexcept
{
std::va_list args1, args2;
va_start(args1, fmt);
va_copy(args2, args1);
const int size = vsnprintf(nullptr, 0, fmt, args1);
va_end(args1);
assert(size >= 0);
auto buffer = std::make_unique<char[]>(size + 1);
vsprintf(buffer.get(), fmt, args2);
va_end(args2);
return std::system_error(std::error_code(result, hresult_category()),
std::string(buffer.get(), size));
}