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// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#ifndef FILE_ERROR_H_839567308565656789
#define FILE_ERROR_H_839567308565656789
#include <string>
#include "zstring.h"
#include "utf.h"
#include "sys_error.h" //we'll need this later anyway!
namespace zen
{
//A high-level exception class giving detailed context information for end users
class FileError
{
public:
explicit FileError(const std::wstring& msg) : msg_(msg) {}
FileError(const std::wstring& msg, const std::wstring& details) : msg_(msg + L"\n\n" + details) {}
virtual ~FileError() {}
const std::wstring& toString() const { return msg_; }
private:
std::wstring msg_;
};
#define DEFINE_NEW_FILE_ERROR(X) struct X : public FileError { X(const std::wstring& msg) : FileError(msg) {} X(const std::wstring& msg, const std::wstring& descr) : FileError(msg, descr) {} };
DEFINE_NEW_FILE_ERROR(ErrorTargetExisting);
//DEFINE_NEW_FILE_ERROR(ErrorTargetPathMissing);
DEFINE_NEW_FILE_ERROR(ErrorFileLocked);
DEFINE_NEW_FILE_ERROR(ErrorDifferentVolume);
//CAVEAT: thread-local Win32 error code is easily overwritten => evaluate *before* making any (indirect) system calls:
//-> MinGW + Win XP: "throw" statement allocates memory to hold the exception object => error code is cleared
//-> VC 2015, Debug: std::wstring allocator internally calls ::FlsGetValue() => error code is cleared
// https://connect.microsoft.com/VisualStudio/feedback/details/1775690/calling-operator-new-may-set-lasterror-to-0
#ifdef _MSC_VER
#define THROW_LAST_FILE_ERROR(msg, functionName) \
do \
{ \
const ErrorCode ecInternal = getLastError(); \
throw FileError(msg, formatSystemError(functionName, ecInternal)); \
\
__pragma(warning(suppress: 4127)) /*"conditional expression is constant"*/ \
} while (false)
#else //same thing witout "__pragma":
#define THROW_LAST_FILE_ERROR(msg, functionName) \
do { const ErrorCode ecInternal = getLastError(); throw FileError(msg, formatSystemError(functionName, ecInternal)); } while (false)
#endif
//----------- facilitate usage of std::wstring for error messages --------------------
inline
std::wstring fmtPath(const std::wstring& displayPath)
{
return L'\"' + displayPath + L'\"';
}
inline std::wstring fmtPath(const Zstring& displayPath) { return fmtPath(utfCvrtTo<std::wstring>(displayPath)); }
inline std::wstring fmtPath(const wchar_t* displayPath) { return fmtPath(std::wstring(displayPath)); }
}
#endif //FILE_ERROR_H_839567308565656789
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