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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 SYMLINK_TARGET_H_801783470198357483
#define SYMLINK_TARGET_H_801783470198357483
#include "file_error.h"
#include "file_path.h"
#include <unistd.h>
#include <stdlib.h> //realpath
namespace zen
{
struct SymlinkRawContent
{
Zstring targetPath;
};
SymlinkRawContent getSymlinkRawContent(const Zstring& linkPath); //throw FileError
Zstring getSymlinkResolvedPath(const Zstring& linkPath); //throw FileError
}
//################################ implementation ################################
namespace zen
{
namespace
{
//retrieve raw target data of symlink or junction
SymlinkRawContent getSymlinkRawContent_impl(const Zstring& linkPath) //throw SysError
{
const size_t bufSize = 10000;
std::vector<char> buf(bufSize);
const ssize_t bytesWritten = ::readlink(linkPath.c_str(), buf.data(), bufSize);
if (bytesWritten < 0)
THROW_LAST_SYS_ERROR("readlink");
if (makeUnsigned(bytesWritten) >= bufSize) //detect truncation; not an error for readlink!
throw SysError(formatSystemError("readlink", L"", L"Buffer truncated."));
return {.targetPath = Zstring(buf.data(), bytesWritten)}; //readlink does not append 0-termination!
}
Zstring getSymlinkResolvedPath_impl(const Zstring& linkPath) //throw SysError
{
char* targetPath = ::realpath(linkPath.c_str(), nullptr);
if (!targetPath)
THROW_LAST_SYS_ERROR("realpath");
ZEN_ON_SCOPE_EXIT(::free(targetPath));
return targetPath;
}
}
inline
SymlinkRawContent getSymlinkRawContent(const Zstring& linkPath)
{
try
{
return getSymlinkRawContent_impl(linkPath); //throw SysError
}
catch (const SysError& e) { throw FileError(replaceCpy(_("Cannot resolve symbolic link %x."), L"%x", fmtPath(linkPath)), e.toString()); }
}
inline
Zstring getSymlinkResolvedPath(const Zstring& linkPath)
{
try
{
return getSymlinkResolvedPath_impl(linkPath); //throw SysError
}
catch (const SysError& e) { throw FileError(replaceCpy(_("Cannot determine final path for %x."), L"%x", fmtPath(linkPath)), e.toString()); }
}
}
#endif //SYMLINK_TARGET_H_801783470198357483
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