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Edit File: file_status.hpp

//  boost/filesystem/file_status.hpp  --------------------------------------------------//

//  Copyright Beman Dawes 2002-2009
//  Copyright Jan Langer 2002
//  Copyright Dietmar Kuehl 2001
//  Copyright Vladimir Prus 2002
//  Copyright Andrey Semashev 2019

//  Distributed under the Boost Software License, Version 1.0.
//  See http://www.boost.org/LICENSE_1_0.txt

//  Library home page: http://www.boost.org/libs/filesystem

//--------------------------------------------------------------------------------------//

#ifndef BOOST_FILESYSTEM3_FILE_STATUS_HPP
#define BOOST_FILESYSTEM3_FILE_STATUS_HPP

#include <boost/config.hpp>

# if defined( BOOST_NO_STD_WSTRING )
#   error Configuration not supported: Boost.Filesystem V3 and later requires std::wstring support
# endif

#include <boost/filesystem/config.hpp>

#include <boost/detail/bitmask.hpp>

#include <boost/config/abi_prefix.hpp> // must be the last #include

//--------------------------------------------------------------------------------------//

namespace boost {
namespace filesystem {

//--------------------------------------------------------------------------------------//
//                                     file_type                                        //
//--------------------------------------------------------------------------------------//

enum file_type
{
  status_error,
# ifndef BOOST_FILESYSTEM_NO_DEPRECATED
  status_unknown = status_error,
# endif
  file_not_found,
  regular_file,
  directory_file,
  // the following may not apply to some operating systems or file systems
  symlink_file,
  block_file,
  character_file,
  fifo_file,
  socket_file,
  reparse_file,  // Windows: FILE_ATTRIBUTE_REPARSE_POINT that is not a symlink
  type_unknown,  // file does exist, but isn't one of the above types or
                 // we don't have strong enough permission to find its type

_detail_directory_symlink  // internal use only; never exposed to users
};

//--------------------------------------------------------------------------------------//
//                                       perms                                          //
//--------------------------------------------------------------------------------------//

enum perms
{
  no_perms = 0,       // file_not_found is no_perms rather than perms_not_known

// POSIX equivalent macros given in comments.
  // Values are from POSIX and are given in octal per the POSIX standard.

// permission bits

owner_read = 0400,  // S_IRUSR, Read permission, owner
  owner_write = 0200, // S_IWUSR, Write permission, owner
  owner_exe = 0100,   // S_IXUSR, Execute/search permission, owner
  owner_all = 0700,   // S_IRWXU, Read, write, execute/search by owner

group_read = 040,   // S_IRGRP, Read permission, group
  group_write = 020,  // S_IWGRP, Write permission, group
  group_exe = 010,    // S_IXGRP, Execute/search permission, group
  group_all = 070,    // S_IRWXG, Read, write, execute/search by group

others_read = 04,   // S_IROTH, Read permission, others
  others_write = 02,  // S_IWOTH, Write permission, others
  others_exe = 01,    // S_IXOTH, Execute/search permission, others
  others_all = 07,    // S_IRWXO, Read, write, execute/search by others

all_all = 0777,     // owner_all|group_all|others_all

// other POSIX bits

set_uid_on_exe = 04000, // S_ISUID, Set-user-ID on execution
  set_gid_on_exe = 02000, // S_ISGID, Set-group-ID on execution
  sticky_bit     = 01000, // S_ISVTX,
                          // (POSIX XSI) On directories, restricted deletion flag
                          // (V7) 'sticky bit': save swapped text even after use
                          // (SunOS) On non-directories: don't cache this file
                          // (SVID-v4.2) On directories: restricted deletion flag
                          // Also see http://en.wikipedia.org/wiki/Sticky_bit

perms_mask = 07777,     // all_all|set_uid_on_exe|set_gid_on_exe|sticky_bit

perms_not_known = 0xFFFF, // present when directory_entry cache not loaded

// options for permissions() function

add_perms = 0x1000,     // adds the given permission bits to the current bits
  remove_perms = 0x2000,  // removes the given permission bits from the current bits;
                          // choose add_perms or remove_perms, not both; if neither add_perms
                          // nor remove_perms is given, replace the current bits with
                          // the given bits.

symlink_perms = 0x4000, // on POSIX, don't resolve symlinks; implied on Windows

// BOOST_BITMASK op~ casts to int32_least_t, producing invalid enum values
  _detail_extend_perms_32_1 = 0x7fffffff,
  _detail_extend_perms_32_2 = -0x7fffffff-1
};

BOOST_BITMASK(perms)

//--------------------------------------------------------------------------------------//
//                                    file_status                                       //
//--------------------------------------------------------------------------------------//

class file_status
{
public:
  BOOST_CONSTEXPR file_status() BOOST_NOEXCEPT :
    m_value(status_error), m_perms(perms_not_known)
  {
  }
  explicit BOOST_CONSTEXPR file_status(file_type v) BOOST_NOEXCEPT :
    m_value(v), m_perms(perms_not_known)
  {
  }
  BOOST_CONSTEXPR file_status(file_type v, perms prms) BOOST_NOEXCEPT :
    m_value(v), m_perms(prms)
  {
  }

//  As of October 2015 the interaction between noexcept and =default is so troublesome
  //  for VC++, GCC, and probably other compilers, that =default is not used with noexcept
  //  functions. GCC is not even consistent for the same release on different platforms.

BOOST_CONSTEXPR file_status(const file_status& rhs) BOOST_NOEXCEPT :
    m_value(rhs.m_value), m_perms(rhs.m_perms)
  {
  }
  BOOST_CXX14_CONSTEXPR file_status& operator=(const file_status& rhs) BOOST_NOEXCEPT
  {
    m_value = rhs.m_value;
    m_perms = rhs.m_perms;
    return *this;
  }

# if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
  // Note: std::move is not constexpr in C++11, that's why we're not using it here
  BOOST_CONSTEXPR file_status(file_status&& rhs) BOOST_NOEXCEPT :
    m_value(static_cast< file_type&& >(rhs.m_value)), m_perms(static_cast< enum perms&& >(rhs.m_perms))
  {
  }
  BOOST_CXX14_CONSTEXPR file_status& operator=(file_status&& rhs) BOOST_NOEXCEPT
  {
    m_value = static_cast< file_type&& >(rhs.m_value);
    m_perms = static_cast< enum perms&& >(rhs.m_perms);
    return *this;
  }
# endif

// observers
  BOOST_CONSTEXPR file_type  type() const BOOST_NOEXCEPT            { return m_value; }
  BOOST_CONSTEXPR perms      permissions() const BOOST_NOEXCEPT     { return m_perms; }

// modifiers
  BOOST_CXX14_CONSTEXPR void type(file_type v) BOOST_NOEXCEPT       { m_value = v; }
  BOOST_CXX14_CONSTEXPR void permissions(perms prms) BOOST_NOEXCEPT { m_perms = prms; }

BOOST_CONSTEXPR bool operator==(const file_status& rhs) const BOOST_NOEXCEPT
  {
    return type() == rhs.type() && permissions() == rhs.permissions();
  }
  BOOST_CONSTEXPR bool operator!=(const file_status& rhs) const BOOST_NOEXCEPT
  {
    return !(*this == rhs);
  }

private:
  file_type   m_value;
  enum perms  m_perms;
};

inline BOOST_CONSTEXPR bool type_present(file_status f) BOOST_NOEXCEPT
{
  return f.type() != status_error;
}
inline BOOST_CONSTEXPR bool permissions_present(file_status f) BOOST_NOEXCEPT
{
  return f.permissions() != perms_not_known;
}
inline BOOST_CONSTEXPR bool status_known(file_status f) BOOST_NOEXCEPT
{
  return filesystem::type_present(f) && filesystem::permissions_present(f);
}
inline BOOST_CONSTEXPR bool exists(file_status f) BOOST_NOEXCEPT
{
  return f.type() != status_error && f.type() != file_not_found;
}
inline BOOST_CONSTEXPR bool is_regular_file(file_status f) BOOST_NOEXCEPT
{
  return f.type() == regular_file;
}
inline BOOST_CONSTEXPR bool is_directory(file_status f) BOOST_NOEXCEPT
{
  return f.type() == directory_file;
}
inline BOOST_CONSTEXPR bool is_symlink(file_status f) BOOST_NOEXCEPT
{
  return f.type() == symlink_file;
}
inline BOOST_CONSTEXPR bool is_other(file_status f) BOOST_NOEXCEPT
{
  return filesystem::exists(f) && !filesystem::is_regular_file(f)
    && !filesystem::is_directory(f) && !filesystem::is_symlink(f);
}

# ifndef BOOST_FILESYSTEM_NO_DEPRECATED
inline bool is_regular(file_status f) BOOST_NOEXCEPT { return filesystem::is_regular_file(f); }
# endif

} // namespace filesystem
} // namespace boost

#include <boost/config/abi_suffix.hpp> // pops abi_prefix.hpp pragmas
#endif // BOOST_FILESYSTEM3_FILE_STATUS_HPP