libs/filesystem/src/operations_posix_windows.cpp
// directory_posix_windows.cpp ---------------------------------------------//
// Copyright � 2002 Beman Dawes
// Copyright � 2001 Dietmar K�hl
// Use, modification, and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy
// at http://www.boost.org/LICENSE_1_0.txt)
// See library home page at http://www.boost.org/libs/filesystem
//----------------------------------------------------------------------------//
// The point of this implementation is to prove the interface. There is no
// claim the implementation is efficient, follows good coding practice, etc.
//----------------------------------------------------------------------------//
// define BOOST_FILESYSTEM_SOURCE so that <boost/filesystem/config.hpp> knows
// the library is being built (possibly exporting rather than importing code)
#define BOOST_FILESYSTEM_SOURCE
#include <boost/filesystem/config.hpp>
#include <boost/filesystem/operations.hpp>
#include <boost/filesystem/exception.hpp>
#include <boost/scoped_array.hpp>
#include <boost/throw_exception.hpp>
#include <boost/detail/workaround.hpp>
#include <cstring>
#ifdef BOOST_NO_STDC_NAMESPACE
namespace std { using ::strcmp; using ::remove; using ::rename; }
#endif
namespace fs = boost::filesystem;
// BOOST_POSIX or BOOST_WINDOWS specify which API to use.
# if !defined( BOOST_WINDOWS ) && !defined( BOOST_POSIX )
# if defined(_WIN32) || defined(__WIN32__) || defined(WIN32) || defined(__CYGWIN__)
# define BOOST_WINDOWS
# else
# define BOOST_POSIX
# endif
# endif
# if defined(BOOST_WINDOWS)
# include "windows.h"
# if defined(__BORLANDC__) || defined(__MWERKS__)
# if defined(__BORLANDC__)
using std::time_t;
# endif
# include "utime.h"
# else
# include "sys/utime.h"
# endif
// For Windows, the xxxA form of various function names is used to avoid
// inadvertently getting wide forms of the functions. (The undecorated
// forms are actually macros, so can misfire if the user has various
// other macros defined. There was a bug report of this happening.)
# else // BOOST_POSIX
# define _USE_FILE_OFFSET_BITS 64 // at worst,
# define __USE_FILE_OFFSET64 // these defines may do nothing,
// but that won't matter on 64-bit systems or on 32-bit systems which
// don't have files larger than can be represented by a traditional
// POSIX/UNIX off_t type. OTOH, defining them should kick
// in 64-bit off_t's (and thus st_size) on 32-bit systems that support
// the Large File Support (LFS) interface, such as Linux, Solaris, and IRIX.
# include <sys/types.h>
# include "dirent.h"
# include "unistd.h"
# include "fcntl.h"
# include "utime.h"
# endif
#include <sys/stat.h> // even on Windows some functions use stat()
#include <string>
#include <cstdio> // for remove, rename
#include <cerrno>
#include <cassert>
#include <boost/config/abi_prefix.hpp> // must be the last header
// helpers -----------------------------------------------------------------//
namespace
{
#ifdef BOOST_POSIX
# define BOOST_HANDLE DIR *
# define BOOST_INVALID_HANDLE_VALUE 0
# define BOOST_SYSTEM_DIRECTORY_TYPE struct dirent *
inline const char * find_first_file( const char * dir,
BOOST_HANDLE & handle, BOOST_SYSTEM_DIRECTORY_TYPE & )
// Returns: 0 if error, otherwise name
{
const char * dummy_first_name = ".";
return ( (handle = ::opendir( dir ))
== BOOST_INVALID_HANDLE_VALUE ) ? 0 : dummy_first_name;
}
inline void find_close( BOOST_HANDLE handle )
{
assert( handle != BOOST_INVALID_HANDLE_VALUE );
::closedir( handle );
}
inline const char * find_next_file(
BOOST_HANDLE handle, const fs::path & ph, BOOST_SYSTEM_DIRECTORY_TYPE & )
// Returns: if EOF 0, otherwise name
// Throws: if system reports error
{
// TODO: use readdir_r() if available, so code is multi-thread safe.
// Fly-in-ointment: not all platforms support readdir_r().
struct dirent * dp;
errno = 0;
if ( (dp = ::readdir( handle )) == 0 )
{
if ( errno != 0 )
{
boost::throw_exception(
fs::filesystem_error(
"boost::filesystem::directory_iterator::operator++",
ph, errno ) );
}
else { return 0; } // end reached
}
return dp->d_name;
}
#else // BOOST_WINDOWS
# define BOOST_HANDLE HANDLE
# define BOOST_INVALID_HANDLE_VALUE INVALID_HANDLE_VALUE
# define BOOST_SYSTEM_DIRECTORY_TYPE WIN32_FIND_DATAA
inline const char * find_first_file( const char * dir,
BOOST_HANDLE & handle, BOOST_SYSTEM_DIRECTORY_TYPE & data )
// Returns: 0 if error, otherwise name
{
// std::cout << "find_first_file " << dir << std::endl;
std::string dirpath( std::string(dir) + "/*" );
return ( (handle = ::FindFirstFileA( dirpath.c_str(), &data ))
== BOOST_INVALID_HANDLE_VALUE ) ? 0 : data.cFileName;
}
inline void find_close( BOOST_HANDLE handle )
{
// std::cout << "find_close" << std::endl;
assert( handle != BOOST_INVALID_HANDLE_VALUE );
::FindClose( handle );
}
inline const char * find_next_file(
BOOST_HANDLE handle, const fs::path & ph,
BOOST_SYSTEM_DIRECTORY_TYPE & data )
// Returns: 0 if EOF, otherwise name
// Throws: if system reports error
{
if ( ::FindNextFileA( handle, &data ) == 0 )
{
if ( ::GetLastError() != ERROR_NO_MORE_FILES )
{
boost::throw_exception( fs::filesystem_error(
"boost::filesystem::directory_iterator::operator++",
ph.branch_path(), fs::detail::system_error_code() ) );
}
else { return 0; } // end reached
}
return data.cFileName;
}
#endif
fs::directory_iterator end_itr;
bool is_empty_directory( const fs::path & dir_path )
{
return fs::directory_iterator(dir_path) == end_itr;
}
unsigned long remove_all_aux( const fs::path & ph )
{
unsigned long count = 1;
if ( !fs::symbolic_link_exists( ph ) // don't recurse symbolic links
&& fs::is_directory( ph ) )
{
for ( fs::directory_iterator itr( ph );
itr != end_itr; ++itr )
{
count += remove_all_aux( *itr );
}
}
fs::remove( ph );
return count;
}
} // unnamed namespace
namespace boost
{
namespace filesystem
{
namespace detail
{
// dir_itr_imp -------------------------------------------------------------//
class dir_itr_imp
{
public:
path entry_path;
BOOST_HANDLE handle;
~dir_itr_imp()
{
if ( handle != BOOST_INVALID_HANDLE_VALUE ) find_close( handle );
}
};
// dot_or_dot_dot ----------------------------------------------------------//
inline bool dot_or_dot_dot( const char * name )
{
# if !BOOST_WORKAROUND( __BORLANDC__, BOOST_TESTED_AT(0x0564) )
return std::strcmp( name, "." ) == 0
|| std::strcmp( name, ".." ) == 0;
# else
// Borland workaround for failure of intrinsics to be placed in
// namespace std with certain combinations of compiler options.
// To ensure test coverage, the workaround is applied to all
// configurations, regardless of option settings.
return name[0]=='.'
&& (name[1]=='\0' || (name[1]=='.' && name[2]=='\0'));
# endif
}
// directory_iterator implementation ---------------------------------------//
BOOST_FILESYSTEM_DECL void dir_itr_init( dir_itr_imp_ptr & m_imp,
const path & dir_path )
{
m_imp.reset( new dir_itr_imp );
BOOST_SYSTEM_DIRECTORY_TYPE scratch;
const char * name = 0; // initialization quiets compiler warnings
if ( dir_path.empty() )
m_imp->handle = BOOST_INVALID_HANDLE_VALUE;
else
name = find_first_file( dir_path.native_directory_string().c_str(),
m_imp->handle, scratch ); // sets handle
if ( m_imp->handle != BOOST_INVALID_HANDLE_VALUE )
{
m_imp->entry_path = dir_path;
// append name, except ignore "." or ".."
if ( !dot_or_dot_dot( name ) )
{
m_imp->entry_path.m_path_append( name, no_check );
}
else
{
m_imp->entry_path.m_path_append( "dummy", no_check );
dir_itr_increment( m_imp );
}
}
else
{
boost::throw_exception( filesystem_error(
"boost::filesystem::directory_iterator constructor",
dir_path, fs::detail::system_error_code() ) );
}
}
BOOST_FILESYSTEM_DECL path & dir_itr_dereference(
const dir_itr_imp_ptr & m_imp )
{
assert( m_imp.get() ); // fails if dereference end iterator
return m_imp->entry_path;
}
BOOST_FILESYSTEM_DECL void dir_itr_increment( dir_itr_imp_ptr & m_imp )
{
assert( m_imp.get() ); // fails on increment end iterator
assert( m_imp->handle != BOOST_INVALID_HANDLE_VALUE ); // reality check
BOOST_SYSTEM_DIRECTORY_TYPE scratch;
const char * name;
while ( (name = find_next_file( m_imp->handle,
m_imp->entry_path, scratch )) != 0 )
{
// append name, except ignore "." or ".."
if ( !dot_or_dot_dot( name ) )
{
m_imp->entry_path.m_replace_leaf( name );
return;
}
}
m_imp.reset(); // make base() the end iterator
}
} // namespace detail
// free functions ----------------------------------------------------------//
BOOST_FILESYSTEM_DECL bool exists( const path & ph )
{
# ifdef BOOST_POSIX
struct stat path_stat;
if(::stat( ph.string().c_str(), &path_stat ) != 0)
{
if((errno == ENOENT) || (errno == ENOTDIR))
return false; // stat failed because the path does not exist
// for any other error we assume the file does exist and fall through,
// this may not be the best policy though... (JM 20040330)
}
return true;
# else
if(::GetFileAttributesA( ph.string().c_str() ) == 0xFFFFFFFF)
{
UINT err = ::GetLastError();
if((err == ERROR_FILE_NOT_FOUND) || (err == ERROR_INVALID_PARAMETER) || (err == ERROR_PATH_NOT_FOUND) || (err == ERROR_INVALID_NAME))
return false; // GetFileAttributes failed because the path does not exist
// for any other error we assume the file does exist and fall through,
// this may not be the best policy though... (JM 20040330)
return true;
}
return true;
# endif
}
BOOST_FILESYSTEM_DECL bool possible_large_file_size_support()
{
# ifdef BOOST_POSIX
struct stat lcl_stat;
return sizeof( lcl_stat.st_size ) > 4;
# else
return true;
# endif
}
// suggested by Walter Landry
BOOST_FILESYSTEM_DECL bool symbolic_link_exists( const path & ph )
{
# ifdef BOOST_POSIX
struct stat path_stat;
return ::lstat( ph.native_file_string().c_str(), &path_stat ) == 0
&& S_ISLNK( path_stat.st_mode );
# else
return false; // Windows has no O/S concept of symbolic links
// (.lnk files are an application feature, not
// a Windows operating system feature)
# endif
}
BOOST_FILESYSTEM_DECL bool is_directory( const path & ph )
{
# ifdef BOOST_POSIX
struct stat path_stat;
if ( ::stat( ph.native_directory_string().c_str(), &path_stat ) != 0 )
boost::throw_exception( filesystem_error(
"boost::filesystem::is_directory",
ph, fs::detail::system_error_code() ) );
return S_ISDIR( path_stat.st_mode );
# else
DWORD attributes = ::GetFileAttributesA( ph.native_directory_string().c_str() );
if ( attributes == 0xFFFFFFFF )
boost::throw_exception( filesystem_error(
"boost::filesystem::is_directory",
ph, fs::detail::system_error_code() ) );
return (attributes & FILE_ATTRIBUTE_DIRECTORY) != 0;
# endif
}
BOOST_FILESYSTEM_DECL bool _is_empty( const path & ph )
{
# ifdef BOOST_POSIX
struct stat path_stat;
if ( ::stat( ph.string().c_str(), &path_stat ) != 0 )
boost::throw_exception( filesystem_error(
"boost::filesystem::is_empty",
ph, fs::detail::system_error_code() ) );
return S_ISDIR( path_stat.st_mode )
? is_empty_directory( ph )
: path_stat.st_size == 0;
# else
WIN32_FILE_ATTRIBUTE_DATA fad;
if ( !::GetFileAttributesExA( ph.string().c_str(),
::GetFileExInfoStandard, &fad ) )
boost::throw_exception( filesystem_error(
"boost::filesystem::is_empty",
ph, fs::detail::system_error_code() ) );
return ( fad.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY )
? is_empty_directory( ph )
:( !fad.nFileSizeHigh && !fad.nFileSizeLow );
# endif
}
# ifdef BOOST_WINDOWS
// Thanks to Jeremy Maitin-Shepard for much help and for permission to
// base the implementation on portions of his file-equivalence-win32.cpp
// experimental code.
struct handle_wrapper
{
BOOST_HANDLE handle;
handle_wrapper( BOOST_HANDLE h )
: handle(h) {}
~handle_wrapper()
{
if ( handle != BOOST_INVALID_HANDLE_VALUE )
::CloseHandle(handle);
}
};
# endif
BOOST_FILESYSTEM_DECL bool equivalent( const path & ph1, const path & ph2 )
{
# ifdef BOOST_POSIX
struct stat s1;
int s1_result = ::stat( ph1.string().c_str(), &s1 );
// save error code in case we have to throw
int error1 = (s1_result != 0 ? fs::detail::system_error_code() : 0);
struct stat s2;
int s2_result = ::stat( ph2.string().c_str(), &s2 );
if ( s1_result != 0
|| s2_result != 0 )
{
if ( s1_result == 0 || s2_result == 0 ) return false;
assert( s1_result != 0 && s2_result != 0 );
boost::throw_exception( filesystem_error(
"boost::filesystem::equivalent",
ph1, error1 ) );
}
// at this point, both stats are known to be valid
return s1.st_dev == s2.st_dev
&& s1.st_ino == s2.st_ino
// According to the POSIX stat specs, "The st_ino and st_dev fields
// taken together uniquely identify the file within the system."
// Just to be sure, size and mod time are also checked.
&& s1.st_size == s2.st_size
&& s1.st_mtime == s2.st_mtime;
# else
// Note well: Physical location on external media is part of the
// equivalence criteria. If there are no open handles, physical location
// can change due to defragmentation or other relocations. Thus handles
// must be held open until location information for both paths has
// been retrieved.
handle_wrapper p1(
::CreateFileA(
ph1.string().c_str(),
0,
FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
0,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS,
0 ) );
int error1; // save error code in case we have to throw
if ( p1.handle == BOOST_INVALID_HANDLE_VALUE )
error1 = fs::detail::system_error_code();
handle_wrapper p2(
::CreateFileA(
ph2.string().c_str(),
0,
FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
0,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS,
0 ) );
if ( p1.handle == BOOST_INVALID_HANDLE_VALUE
|| p2.handle == BOOST_INVALID_HANDLE_VALUE )
{
if ( p1.handle != BOOST_INVALID_HANDLE_VALUE
|| p2.handle != BOOST_INVALID_HANDLE_VALUE ) return false;
assert( p1.handle == BOOST_INVALID_HANDLE_VALUE
&& p2.handle == BOOST_INVALID_HANDLE_VALUE );
boost::throw_exception( filesystem_error(
"boost::filesystem::equivalent",
ph1, error1 ) );
}
// at this point, both handles are known to be valid
BY_HANDLE_FILE_INFORMATION info1, info2;
if ( !::GetFileInformationByHandle( p1.handle, &info1 ) )
boost::throw_exception( filesystem_error(
"boost::filesystem::equivalent",
ph1, fs::detail::system_error_code() ) );
if ( !::GetFileInformationByHandle( p2.handle, &info2 ) )
boost::throw_exception( filesystem_error(
"boost::filesystem::equivalent",
ph2, fs::detail::system_error_code() ) );
// In theory, volume serial numbers are sufficient to distinguish between
// devices, but in practice VSN's are sometimes duplicated, so device id
// is also checked. Device id's alone aren't sufficient because network
// share devices on different machines will have the same id. Furthermore,
// cheap floppy disks often have 0 VSN's and are mounted on the same
// lettered drive across networks, so last write time and file size is
// checked to distinguish that case as far as is possible.
if ( info1.dwVolumeSerialNumber != info2.dwVolumeSerialNumber
|| info1.nFileIndexHigh != info2.nFileIndexHigh
|| info1.nFileIndexLow != info2.nFileIndexLow
|| info1.nFileSizeHigh != info2.nFileSizeHigh
|| info1.nFileSizeLow != info2.nFileSizeLow ) return false;
struct stat s1;
if ( ::stat( ph1.string().c_str(), &s1 ) != 0 )
boost::throw_exception( filesystem_error(
"boost::filesystem::equivalent",
ph1, fs::detail::system_error_code() ) );
struct stat s2;
if ( ::stat( ph2.string().c_str(), &s2 ) != 0 )
boost::throw_exception( filesystem_error(
"boost::filesystem::equivalent",
ph2, fs::detail::system_error_code() ) );
return s1.st_dev == s2.st_dev;
# endif
}
BOOST_FILESYSTEM_DECL boost::intmax_t file_size( const path & ph )
{
# ifdef BOOST_POSIX
struct stat path_stat;
if ( ::stat( ph.string().c_str(), &path_stat ) != 0 )
boost::throw_exception( filesystem_error(
"boost::filesystem::file_size",
ph, fs::detail::system_error_code() ) );
if ( S_ISDIR( path_stat.st_mode ) )
boost::throw_exception( filesystem_error(
"boost::filesystem::file_size",
ph, "invalid: is a directory",
is_directory_error ) );
return static_cast<boost::intmax_t>(path_stat.st_size);
# else
// by now, intmax_t is 64-bits on all Windows compilers
WIN32_FILE_ATTRIBUTE_DATA fad;
if ( !::GetFileAttributesExA( ph.string().c_str(),
::GetFileExInfoStandard, &fad ) )
boost::throw_exception( filesystem_error(
"boost::filesystem::file_size",
ph, fs::detail::system_error_code() ) );
if ( (fad.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) !=0 )
boost::throw_exception( filesystem_error(
"boost::filesystem::file_size",
ph, "invalid: is a directory",
is_directory_error ) );
return (static_cast<boost::intmax_t>(fad.nFileSizeHigh)
<< (sizeof(fad.nFileSizeLow)*8))
+ fad.nFileSizeLow;
# endif
}
BOOST_FILESYSTEM_DECL std::time_t last_write_time( const path & ph )
{
// Works for both Windows and POSIX
struct stat path_stat;
if ( ::stat( ph.string().c_str(), &path_stat ) != 0 )
boost::throw_exception( filesystem_error(
"boost::filesystem::last_write_time",
ph, fs::detail::system_error_code() ) );
return path_stat.st_mtime;
}
BOOST_FILESYSTEM_DECL void last_write_time( const path & ph, const std::time_t new_time )
{
// Works for both Windows and POSIX
struct stat path_stat;
if ( ::stat( ph.string().c_str(), &path_stat ) != 0 )
boost::throw_exception( filesystem_error(
"boost::filesystem::last_write_time",
ph, fs::detail::system_error_code() ) );
::utimbuf buf;
buf.actime = path_stat.st_atime; // utime() updates access time too:-(
buf.modtime = new_time;
if ( ::utime( ph.string().c_str(), &buf ) != 0 )
boost::throw_exception( filesystem_error(
"boost::filesystem::last_write_time",
ph, fs::detail::system_error_code() ) );
}
BOOST_FILESYSTEM_DECL bool create_directory( const path & dir_path )
{
# ifdef BOOST_POSIX
if ( ::mkdir( dir_path.native_directory_string().c_str(),
S_IRWXU|S_IRWXG|S_IRWXO ) == 0 ) return true;
if ( errno != EEXIST )
# else
if ( ::CreateDirectoryA( dir_path.native_directory_string().c_str(), 0 ) )
return true;
if ( ::GetLastError() != ERROR_ALREADY_EXISTS )
# endif
boost::throw_exception( filesystem_error(
"boost::filesystem::create_directory",
dir_path, fs::detail::system_error_code() ) );
if ( !is_directory( dir_path ) )
boost::throw_exception( filesystem_error(
"boost::filesystem::create_directory",
dir_path, "path exists and is not a directory", not_directory_error ) );
return false;
}
BOOST_FILESYSTEM_DECL bool remove( const path & ph )
{
if ( exists( ph )
# ifdef BOOST_POSIX
|| symbolic_link_exists( ph ) ) // handle dangling symbolic links
{
// note that the POSIX behavior for symbolic links is what we want;
// the link rather than what it points to is deleted
if ( std::remove( ph.string().c_str() ) != 0 )
{
int error = fs::detail::system_error_code();
// POSIX says "If the directory is not an empty directory, rmdir()
// shall fail and set errno to EEXIST or ENOTEMPTY."
// Linux uses ENOTEMPTY, Solaris uses EEXIST.
if ( error == EEXIST ) error = ENOTEMPTY;
boost::throw_exception( filesystem_error(
"boost::filesystem::remove", ph, error ) );
}
# else
)
{
if ( is_directory( ph ) )
{
if ( !::RemoveDirectoryA( ph.string().c_str() ) )
boost::throw_exception( filesystem_error(
"boost::filesystem::remove",
ph, fs::detail::system_error_code() ) );
}
else
{
if ( !::DeleteFileA( ph.string().c_str() ) )
boost::throw_exception( filesystem_error(
"boost::filesystem::remove",
ph, fs::detail::system_error_code() ) );
}
# endif
return true;
}
return false;
}
BOOST_FILESYSTEM_DECL unsigned long remove_all( const path & ph )
{
return exists( ph )|| symbolic_link_exists( ph )
? remove_all_aux( ph ) : 0;
}
BOOST_FILESYSTEM_DECL void rename( const path & old_path,
const path & new_path )
{
# ifdef BOOST_POSIX
if ( exists( new_path ) // POSIX is too permissive so must check
|| std::rename( old_path.string().c_str(), new_path.string().c_str() ) != 0 )
# else
if ( !::MoveFileA( old_path.string().c_str(), new_path.string().c_str() ) )
# endif
boost::throw_exception( filesystem_error(
"boost::filesystem::rename",
old_path, new_path, fs::detail::system_error_code() ) );
}
BOOST_FILESYSTEM_DECL void copy_file( const path & from_file_ph,
const path & to_file_ph )
{
# ifdef BOOST_POSIX
// TODO: Ask POSIX experts if this is the best way to copy a file
const std::size_t buf_sz = 32768;
boost::scoped_array<char> buf( new char [buf_sz] );
int infile=0, outfile=0; // init quiets compiler warning
struct stat from_stat;
if ( ::stat( from_file_ph.string().c_str(), &from_stat ) != 0
|| (infile = ::open( from_file_ph.string().c_str(),
O_RDONLY )) < 0
|| (outfile = ::open( to_file_ph.string().c_str(),
O_WRONLY | O_CREAT | O_EXCL,
from_stat.st_mode )) < 0 )
{
if ( infile != 0 ) ::close( infile );
boost::throw_exception( filesystem_error(
"boost::filesystem::copy_file",
from_file_ph, to_file_ph, fs::detail::system_error_code() ) );
}
ssize_t sz;
while ( (sz = ::read( infile, buf.get(), buf_sz )) > 0
&& (sz = ::write( outfile, buf.get(), sz )) > 0 ) {}
::close( infile );
::close( outfile );
if ( sz != 0 )
# else
if ( !::CopyFileA( from_file_ph.string().c_str(),
to_file_ph.string().c_str(), /*fail_if_exists=*/true ) )
# endif
boost::throw_exception( filesystem_error(
"boost::filesystem::copy_file",
from_file_ph, to_file_ph, fs::detail::system_error_code() ) );
}
BOOST_FILESYSTEM_DECL path current_path()
{
# ifdef BOOST_POSIX
for ( long path_max = 32;; path_max *=2 ) // loop 'til buffer large enough
{
boost::scoped_array<char>
buf( new char[static_cast<std::size_t>(path_max)] );
if ( ::getcwd( buf.get(), static_cast<std::size_t>(path_max) ) == 0 )
{
if ( errno != ERANGE )
boost::throw_exception(
filesystem_error( "boost::filesystem::current_path", path(),
fs::detail::system_error_code() ) );
}
else return path( buf.get(), native );
}
BOOST_UNREACHABLE_RETURN(0)
# else
DWORD sz;
if ( (sz = ::GetCurrentDirectoryA( 0, static_cast<char*>(0) )) == 0 )
boost::throw_exception(
filesystem_error( "boost::filesystem::current_path",
"size is 0" ) );
boost::scoped_array<char> buf( new char[sz] );
if ( ::GetCurrentDirectoryA( sz, buf.get() ) == 0 )
boost::throw_exception(
filesystem_error( "boost::filesystem::current_path", path(),
fs::detail::system_error_code() ) );
return path( buf.get(), native );
# endif
}
BOOST_FILESYSTEM_DECL const path & initial_path()
{
static path init_path;
if ( init_path.empty() ) init_path = current_path();
return init_path;
}
BOOST_FILESYSTEM_DECL path system_complete( const path & ph )
{
# ifdef BOOST_WINDOWS
if ( ph.empty() ) return ph;
char buf[MAX_PATH];
char * pfn;
std::size_t len = ::GetFullPathNameA( ph.string().c_str(),
sizeof(buf) , buf, &pfn );
if ( !len )
{ boost::throw_exception(
filesystem_error( "boost::filesystem::system_complete",
ph, "size is 0" ) ); }
buf[len] = '\0';
return path( buf, native );
# else
return (ph.empty() || ph.is_complete())
? ph : current_path() / ph;
# endif
}
BOOST_FILESYSTEM_DECL path complete( const path & ph, const path & base )
{
assert( base.is_complete()
&& (ph.is_complete() || !ph.has_root_name()) ); // precondition
# ifdef BOOST_WINDOWS
if (ph.empty() || ph.is_complete()) return ph;
if ( !ph.has_root_name() )
return ph.has_root_directory()
? path( base.root_name(), native ) / ph
: base / ph;
return base / ph;
# else
return (ph.empty() || ph.is_complete()) ? ph : base / ph;
# endif
}
} // namespace filesystem
} // namespace boost