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/*
* Copyright 2003-2021 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 "FileSystem.hxx"
#include "AllocatedPath.hxx"
#include "Limits.hxx"
#include "system/Error.hxx"
#include <cerrno>
#include <fcntl.h>
void
RenameFile(Path oldpath, Path newpath)
{
#ifdef _WIN32
if (!MoveFileEx(oldpath.c_str(), newpath.c_str(),
MOVEFILE_REPLACE_EXISTING))
throw MakeLastError("Failed to rename file");
#else
if (rename(oldpath.c_str(), newpath.c_str()) < 0)
throw MakeErrno("Failed to rename file");
#endif
}
AllocatedPath
ReadLink(Path path)
{
#ifdef _WIN32
(void)path;
errno = EINVAL;
return nullptr;
#else
char buffer[MPD_PATH_MAX];
ssize_t size = readlink(path.c_str(), buffer, MPD_PATH_MAX);
if (size < 0)
return nullptr;
if (size_t(size) >= MPD_PATH_MAX) {
errno = ENOMEM;
return nullptr;
}
return AllocatedPath::FromFS(std::string_view{buffer, size_t(size)});
#endif
}
void
TruncateFile(Path path)
{
#ifdef _WIN32
HANDLE h = CreateFile(path.c_str(), GENERIC_WRITE, 0, nullptr,
TRUNCATE_EXISTING, FILE_ATTRIBUTE_NORMAL,
nullptr);
if (h == INVALID_HANDLE_VALUE)
throw FormatLastError("Failed to truncate %s", path.c_str());
CloseHandle(h);
#else
UniqueFileDescriptor fd;
if (!fd.Open(path.c_str(), O_WRONLY|O_TRUNC))
throw FormatErrno("Failed to truncate %s", path.c_str());
#endif
}
void
RemoveFile(Path path)
{
#ifdef _WIN32
if (!DeleteFile(path.c_str()))
throw FormatLastError("Failed to delete %s", path.c_str());
#else
if (unlink(path.c_str()) < 0)
throw FormatErrno("Failed to delete %s", path.c_str());
#endif
}
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