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// file : butl/filesystem.cxx -*- C++ -*-
// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#include <butl/filesystem>
#include <unistd.h> // stat, rmdir(), unlink()
#include <sys/types.h> // stat
#include <sys/stat.h> // stat, lstat(), S_IS*, mkdir()
#include <memory> // unique_ptr
#include <system_error>
using namespace std;
namespace butl
{
// Figuring out whether we have the nanoseconds in some form.
//
template <typename S>
inline constexpr auto nsec (const S* s) -> decltype(s->st_mtim.tv_nsec)
{
return s->st_mtim.tv_nsec; // POSIX (GNU/Linux, Solaris).
}
template <typename S>
inline constexpr auto nsec (const S* s) -> decltype(s->st_mtimespec.tv_nsec)
{
return s->st_mtimespec.tv_nsec; // MacOS X.
}
template <typename S>
inline constexpr auto nsec (const S* s) -> decltype(s->st_mtime_n)
{
return s->st_mtime_n; // AIX 5.2 and later.
}
template <typename S>
inline constexpr int nsec (...) {return 0;}
timestamp
file_mtime (const path& p)
{
struct stat s;
if (::lstat (p.string ().c_str (), &s) != 0)
{
if (errno == ENOENT || errno == ENOTDIR)
return timestamp_nonexistent;
else
throw system_error (errno, system_category ());
}
return S_ISREG (s.st_mode)
? system_clock::from_time_t (s.st_mtime) +
chrono::duration_cast<duration> (
chrono::nanoseconds (nsec<struct stat> (&s)))
: timestamp_nonexistent;
}
bool
dir_exists (const path& p)
{
struct stat s;
if (::lstat (p.string ().c_str (), &s) != 0)
{
if (errno == ENOENT || errno == ENOTDIR)
return false;
else
throw system_error (errno, system_category ());
}
return S_ISDIR (s.st_mode);
}
bool
file_exists (const path& p)
{
struct stat s;
if (::lstat (p.string ().c_str (), &s) != 0)
{
if (errno == ENOENT || errno == ENOTDIR)
return false;
else
throw system_error (errno, system_category ());
}
return S_ISREG (s.st_mode);
}
mkdir_status
try_mkdir (const path& p, mode_t m)
{
mkdir_status r (mkdir_status::success);
if (::mkdir (p.string ().c_str (), m) != 0)
{
int e (errno);
// EEXIST means the path already exists but not necessarily as
// a directory.
//
if (e == EEXIST && dir_exists (p))
return mkdir_status::already_exists;
else
throw system_error (e, system_category ());
}
return r;
}
rmdir_status
try_rmdir (const path& p)
{
rmdir_status r (rmdir_status::success);
if (::rmdir (p.string ().c_str ()) != 0)
{
if (errno == ENOENT)
r = rmdir_status::not_exist;
else if (errno == ENOTEMPTY || errno == EEXIST)
r = rmdir_status::not_empty;
else
throw system_error (errno, system_category ());
}
return r;
}
rmfile_status
try_rmfile (const path& p)
{
rmfile_status r (rmfile_status::success);
if (::unlink (p.string ().c_str ()) != 0)
{
if (errno == ENOENT || errno == ENOTDIR)
r = rmfile_status::not_exist;
else
throw system_error (errno, system_category ());
}
return r;
}
#ifndef _WIN32
// dir_entry
//
entry_type dir_entry::
type (bool link) const
{
path_type p (b_ / p_);
struct stat s;
if ((link
? ::stat (p.string ().c_str (), &s)
: ::lstat (p.string ().c_str (), &s)) != 0)
{
throw system_error (errno, system_category ());
}
entry_type r;
if (S_ISREG (s.st_mode))
r = entry_type::regular;
else if (S_ISDIR (s.st_mode))
r = entry_type::directory;
else if (S_ISLNK (s.st_mode))
r = entry_type::symlink;
else
r = entry_type::other;
return r;
}
// dir_iterator
//
struct dir_deleter
{
void operator() (DIR* p) const {if (p != nullptr) ::closedir (p);}
};
dir_iterator::
dir_iterator (const dir_path& d)
{
unique_ptr<DIR, dir_deleter> h (::opendir (d.string ().c_str ()));
h_ = h.get ();
if (h_ == nullptr)
throw system_error (errno, system_category ());
next ();
if (h_ != nullptr)
e_.b_ = d;
h.release ();
}
template <typename D>
inline /*constexpr*/ entry_type d_type (const D* d, decltype(d->d_type)*)
{
switch (d->d_type)
{
#ifdef DT_DIR
case DT_DIR: return entry_type::directory;
#endif
#ifdef DT_REG
case DT_REG: return entry_type::regular;
#endif
#ifdef DT_LNK
case DT_LNK: return entry_type::symlink;
#endif
#ifdef DT_BLK
case DT_BLK:
#endif
#ifdef DT_CHR
case DT_CHR:
#endif
#ifdef DT_FIFO
case DT_FIFO:
#endif
#ifdef DT_SOCK
case DT_SOCK:
#endif
return entry_type::other;
default: return entry_type::unknown;
}
}
template <typename D>
inline constexpr entry_type d_type (...) {return entry_type::unknown;}
void dir_iterator::
next ()
{
for (;;)
{
errno = 0;
if (struct dirent* de = ::readdir (h_))
{
const char* n (de->d_name);
// Skip '.' and '..'.
//
if (n[0] == '.' && (n[1] == '\0' || (n[1] == '.' && n[2] == '\0')))
continue;
e_.p_ = path (n);
e_.t_ = d_type<struct dirent> (de, nullptr);
e_.lt_ = entry_type::unknown;
}
else if (errno == 0)
{
// End of stream.
//
::closedir (h_);
h_ = nullptr;
}
else
throw system_error (errno, system_category ());
break;
}
}
#else
#endif
}
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