oxmc
87 lines
2.8 KiB
C++
87 lines
2.8 KiB
C++
// *****************************************************************************
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// * This file is part of the FreeFileSync project. It is distributed under *
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// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
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// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
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// *****************************************************************************
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#ifndef SYS_ERROR_H_3284791347018951324534
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#define SYS_ERROR_H_3284791347018951324534
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#include "scope_guard.h" //
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#include "i18n.h" //not used by this header, but the "rest of the world" needs it!
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#include "zstring.h" //
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#include "extra_log.h" //
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#include <glib.h>
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#include <cerrno>
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namespace zen
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{
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//evaluate GetLastError()/errno and assemble specific error message
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using ErrorCode = int;
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ErrorCode getLastError();
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std::wstring formatSystemError(const std::string& functionName, const std::wstring& errorCode, const std::wstring& errorMsg);
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std::wstring formatSystemError(const std::string& functionName, ErrorCode ec);
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std::wstring formatGlibError(const std::string& functionName, GError* error);
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//A low-level exception class giving (non-translated) detail information only - same conceptional level like "GetLastError()"!
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class SysError
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{
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public:
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explicit SysError(const std::wstring& msg) : msg_(msg) {}
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const std::wstring& toString() const { return msg_; }
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private:
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std::wstring msg_;
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};
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#define DEFINE_NEW_SYS_ERROR(X) struct X : public zen::SysError { X(const std::wstring& msg) : SysError(msg) {} };
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//better leave it as a macro (see comment in file_error.h)
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#define THROW_LAST_SYS_ERROR(functionName) \
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do { const ErrorCode ecInternal = getLastError(); throw zen::SysError(formatSystemError(functionName, ecInternal)); } while (false)
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/* Example: ASSERT_SYSERROR(expr);
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Equivalent to:
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if (!expr)
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throw zen::SysError(L"Assertion failed: \"expr\""); */
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#define ASSERT_SYSERROR(expr) ASSERT_SYSERROR_IMPL(expr, #expr) //throw SysError
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//######################## implementation ########################
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inline
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ErrorCode getLastError()
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{
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return errno; //don't use "::" prefix, errno is a macro!
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}
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std::wstring getSystemErrorDescription(ErrorCode ec); //return empty string on error
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//intentional overload ambiguity to catch usage errors with HRESULT:
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std::wstring getSystemErrorDescription(long long) = delete;
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namespace impl
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{
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inline bool validateBool(bool b) { return b; }
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inline bool validateBool(void* b) { return b; }
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bool validateBool(int) = delete; //catch unintended bool conversions, e.g. HRESULT
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}
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#define ASSERT_SYSERROR_IMPL(expr, exprStr) \
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{ if (!zen::impl::validateBool(expr)) \
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throw zen::SysError(L"Assertion failed: \"" L ## exprStr L"\""); }
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}
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#endif //SYS_ERROR_H_3284791347018951324534
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