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// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#ifndef SYS_ERROR_H_3284791347018951324534
#define SYS_ERROR_H_3284791347018951324534
#include <string>
#include "utf.h"
#include "i18n.h"
#include "scope_guard.h"
#include <cstring>
#include <cerrno>
namespace zen
{
//evaluate GetLastError()/errno and assemble specific error message
using ErrorCode = int;
ErrorCode getLastError();
std::wstring formatSystemError(const std::wstring& functionName, ErrorCode ec);
std::wstring formatSystemError(const std::wstring& functionName, const std::wstring& errorCode, const std::wstring& errorMsg);
//A low-level exception class giving (non-translated) detail information only - same conceptional level like "GetLastError()"!
class SysError
{
public:
explicit SysError(const std::wstring& msg) : msg_(msg) {}
const std::wstring& toString() const { return msg_; }
private:
std::wstring msg_;
};
#define DEFINE_NEW_SYS_ERROR(X) struct X : public zen::SysError { X(const std::wstring& msg) : SysError(msg) {} };
#define THROW_LAST_SYS_ERROR(functionName) \
do { const ErrorCode ecInternal = getLastError(); throw SysError(formatSystemError(functionName, ecInternal)); } while (false)
//helper for error checking macros:
inline bool validatBool(bool b) { return b; }
inline bool validatBool(void* b) { return b != nullptr; }
bool validatBool(int) = delete; //catch unintended bool conversions, e.g. HRESULT
//######################## implementation ########################
inline
ErrorCode getLastError()
{
return errno; //don't use "::", errno is a macro!
}
std::wstring formatSystemErrorRaw(long long) = delete; //intentional overload ambiguity to catch usage errors
inline
std::wstring formatSystemErrorRaw(ErrorCode ec) //return empty string on error
{
const ErrorCode currentError = getLastError(); //not necessarily == lastError
std::wstring errorMsg;
ZEN_ON_SCOPE_EXIT(errno = currentError);
errorMsg = utfTo<std::wstring>(::strerror(ec));
trim(errorMsg); //Windows messages seem to end with a blank...
return errorMsg;
}
std::wstring formatSystemError(const std::wstring& functionName, long long lastError) = delete; //intentional overload ambiguity to catch usage errors with HRESULT!
inline
std::wstring formatSystemError(const std::wstring& functionName, ErrorCode ec)
{
const std::wstring errorCode = numberTo<std::wstring>(ec);
const std::wstring errorDescr = formatSystemErrorRaw(ec);
return formatSystemError(functionName, replaceCpy(_("Error Code %x"), L"%x", errorCode), errorDescr);
}
inline
std::wstring formatSystemError(const std::wstring& functionName, const std::wstring& errorCode, const std::wstring& errorMsg)
{
std::wstring output = errorCode + L":";
const std::wstring errorMsgFmt = trimCpy(errorMsg);
if (!errorMsgFmt.empty())
{
output += L" ";
output += errorMsgFmt;
}
output += L" [" + functionName + L"]";
return output;
}
}
#endif //SYS_ERROR_H_3284791347018951324534
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