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// Filesystem directory iterator utilities -*- C++ -*-
// Copyright (C) 2014-2018 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option)
// any later version.
// This library 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.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
#ifndef _GLIBCXX_DIR_COMMON_H
#define _GLIBCXX_DIR_COMMON_H 1
#include <string.h> // strcmp
#ifdef _GLIBCXX_HAVE_DIRENT_H
# ifdef _GLIBCXX_HAVE_SYS_TYPES_H
# include <sys/types.h>
# endif
# include <dirent.h>
#else
# error "the <dirent.h> header is needed to build the Filesystem TS"
#endif
#ifdef _GLIBCXX_FILESYSTEM_IS_WINDOWS
# undef opendir
# define opendir _wopendir
#endif
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace filesystem
{
struct _Dir_base
{
_Dir_base(DIR* dirp = nullptr) : dirp(dirp) { }
// If no error occurs then dirp is non-null,
// otherwise null (whether error ignored or not).
_Dir_base(const char* p, bool skip_permission_denied,
error_code& ec) noexcept
: dirp(::opendir(p))
{
if (dirp)
ec.clear();
else
{
const int err = errno;
if (err == EACCES && skip_permission_denied)
ec.clear();
else
ec.assign(err, std::generic_category());
}
}
_Dir_base(_Dir_base&& d) : dirp(std::exchange(d.dirp, nullptr)) { }
_Dir_base& operator=(_Dir_base&&) = delete;
~_Dir_base() { if (dirp) ::closedir(dirp); }
const struct ::dirent*
advance(bool skip_permission_denied, error_code& ec) noexcept
{
ec.clear();
int err = std::exchange(errno, 0);
const struct ::dirent* entp = readdir(dirp);
// std::swap cannot be used with Bionic's errno
err = std::exchange(errno, err);
if (entp)
{
// skip past dot and dot-dot
if (!strcmp(entp->d_name, ".") || !strcmp(entp->d_name, ".."))
return advance(skip_permission_denied, ec);
return entp;
}
else if (err)
{
if (err == EACCES && skip_permission_denied)
return nullptr;
ec.assign(err, std::generic_category());
return nullptr;
}
else
{
// reached the end
return nullptr;
}
}
DIR* dirp;
};
} // namespace filesystem
// BEGIN/END macros must be defined before including this file.
_GLIBCXX_BEGIN_NAMESPACE_FILESYSTEM
inline file_type
get_file_type(const ::dirent& d __attribute__((__unused__)))
{
#ifdef _GLIBCXX_HAVE_STRUCT_DIRENT_D_TYPE
switch (d.d_type)
{
case DT_BLK:
return file_type::block;
case DT_CHR:
return file_type::character;
case DT_DIR:
return file_type::directory;
case DT_FIFO:
return file_type::fifo;
case DT_LNK:
return file_type::symlink;
case DT_REG:
return file_type::regular;
case DT_SOCK:
return file_type::socket;
case DT_UNKNOWN:
return file_type::unknown;
default:
return file_type::none;
}
#else
return file_type::none;
#endif
}
_GLIBCXX_END_NAMESPACE_FILESYSTEM
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#endif // _GLIBCXX_DIR_COMMON_H
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