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livetrax/libs/pbd/filesystem.cc

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/*
Copyright (C) 2007 Tim Mayberry
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <sys/stat.h>
#include <glib.h>
#include <glib/gstdio.h>
#include <giomm/file.h>
#include <cerrno>
#include <fstream>
#include <glibmm/fileutils.h>
#include <glibmm/miscutils.h>
#include "pbd/filesystem.h"
#include "pbd/error.h"
#include "pbd/compose.h"
#include "pbd/pathscanner.h"
#include "i18n.h"
using namespace std;
namespace PBD {
namespace sys {
path&
path::operator/=(const path& rhs)
{
m_path = Glib::build_filename(m_path, rhs.m_path);
return *this;
}
path&
path::operator/=(const string& rhs)
{
m_path = Glib::build_filename(m_path, rhs);
return *this;
}
path&
path::operator/=(const char* rhs)
{
m_path = Glib::build_filename(m_path, rhs);
return *this;
}
string
path::leaf () const
{
return Glib::path_get_basename(m_path);
}
path
path::branch_path () const
{
string dir = Glib::path_get_dirname (m_path);
/*
* glib returns "." to signify that the path
* has no directory components(branch path)
* whereas boost::filesystem returns an empty
* string
*/
if(dir == ".")
{
return "";
}
return dir;
}
bool
exists (const path & p)
{
return Glib::file_test (p.to_string(), Glib::FILE_TEST_EXISTS);
}
bool
exists_and_writable (const path & p)
{
/* writable() really reflects the whole folder, but if for any
reason the session state file can't be written to, still
make us unwritable.
*/
struct stat statbuf;
if (g_stat (p.to_string().c_str(), &statbuf) != 0) {
/* doesn't exist - not writable */
return false;
} else {
if (!(statbuf.st_mode & S_IWUSR)) {
/* exists and is not writable */
return false;
}
}
return true;
}
bool
is_directory (const path & p)
{
return Glib::file_test (p.to_string(), Glib::FILE_TEST_IS_DIR);
}
bool
create_directory(const path & p)
{
if(is_directory(p)) return false;
int error = g_mkdir (p.to_string().c_str(), S_IRWXU|S_IRWXG|S_IRWXO);
if(error == -1)
{
throw filesystem_error(g_strerror(errno), errno);
}
return true;
}
bool
create_directories(const path & p)
{
if(is_directory(p)) return false;
int error = g_mkdir_with_parents (p.to_string().c_str(), S_IRWXU|S_IRWXG|S_IRWXO);
if(error == -1)
{
throw filesystem_error(g_strerror(errno), errno);
}
return true;
}
bool
remove(const path & p)
{
if(!exists(p)) return false;
int error = g_unlink (p.to_string().c_str());
if(error == -1)
{
throw filesystem_error(g_strerror(errno), errno);
}
return true;
}
void
rename (const path & from_path, const path & to_path)
{
// g_rename is a macro that evaluates to ::rename on
// POSIX systems, without the global namespace qualifier
// it would evaluate to a recursive call(if it compiled)
if ( ::g_rename( from_path.to_string().c_str(),
to_path.to_string().c_str() ) == -1 )
{
throw filesystem_error(g_strerror(errno), errno);
}
}
// XXX character encoding.
void
copy_file(const path & from_path, const path & to_path)
{
std::ifstream in(from_path.to_string().c_str());
std::ofstream out(to_path.to_string().c_str());
if (!in || !out) {
throw filesystem_error(string_compose(_("Could not open files %1 and %2 for copying"),
from_path.to_string(), to_path.to_string()));
}
out << in.rdbuf();
if (!in || !out) {
remove (to_path);
throw filesystem_error(string_compose(_("Could not copy existing file %1 to %2"),
from_path.to_string(), to_path.to_string()));
}
}
static
bool accept_all_files (string const &, void *)
{
return true;
}
void
copy_files(const path & from_path, const path & to_dir)
{
PathScanner scanner;
vector<string*>* files = scanner (from_path.to_string(), accept_all_files, 0, true, false);
for (vector<string*>::iterator i = files->begin(); i != files->end(); ++i) {
sys::path from = from_path;
from /= **i;
sys::path to = to_dir;
to /= **i;
copy_file (from, to);
}
}
string
basename (const path & p)
{
string base(p.leaf());
string::size_type n = base.rfind ('.');
return base.substr (0, n);
}
string
extension (const path & p)
{
string base(p.leaf());
string::size_type n = base.rfind ('.');
if (n != string::npos)
{
return base.substr(n);
}
return string();
}
/** Take a (possibly) relative path and make it absolute */
path
get_absolute_path (const path & p)
{
Glib::RefPtr<Gio::File> f = Gio::File::create_for_path (p.to_string ());
return f->get_path ();
}
/** @return true if a and b have the same inode */
bool
inodes_same (const path& a, const path& b)
{
struct stat bA;
int const rA = stat (a.to_string().c_str(), &bA);
struct stat bB;
int const rB = stat (b.to_string().c_str(), &bB);
return (rA == 0 && rB == 0 && bA.st_ino == bB.st_ino);
}
/** Find out if `needle' is a file or directory within the
* directory `haystack'.
* @return true if it is.
*/
bool
path_is_within (path const & haystack, path needle)
{
while (1) {
if (inodes_same (haystack, needle)) {
return true;
}
needle = needle.branch_path ();
if (needle.to_string().empty() || needle.to_string() == "/") {
break;
}
}
return false;
}
} // namespace sys
} // namespace PBD