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/** @file
* @brief File and path manipulation routines.
*/
/* Copyright (C) 2008 Lemur Consulting Ltd
* Copyright (C) 2008,2009,2010,2012 Olly Betts
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <config.h>
#include "fileutils.h"
#include "xapian/error.h"
#include "safedirent.h"
#include "safeunistd.h"
#include <cerrno>
#include <cstring>
#include <string>
#include <sys/types.h>
using namespace std;
class dircloser {
DIR * dir;
public:
dircloser(DIR * dir_) : dir(dir_) {}
~dircloser() {
if (dir != NULL) {
closedir(dir);
dir = NULL;
}
}
};
void
removedir(const string &dirname)
{
DIR * dir;
dir = opendir(dirname.c_str());
if (dir == NULL) {
if (errno == ENOENT) return;
throw Xapian::DatabaseError("Cannot open directory '" + dirname + "'", errno);
}
{
dircloser dc(dir);
while (true) {
errno = 0;
struct dirent * entry = readdir(dir);
if (entry == NULL) {
if (errno == 0)
break;
throw Xapian::DatabaseError("Cannot read entry from directory at '" + dirname + "'", errno);
}
string name(entry->d_name);
if (name == "." || name == "..")
continue;
if (unlink((dirname + "/" + name).c_str())) {
throw Xapian::DatabaseError("Cannot remove file '" + string(entry->d_name) + "'", errno);
}
}
}
if (rmdir(dirname.c_str())) {
throw Xapian::DatabaseError("Cannot remove directory '" + dirname + "'", errno);
}
}
#ifdef __WIN32__
/// Return true iff a path starts with a drive letter.
static bool
has_drive(const string &path)
{
return (path.size() >= 2 && path[1] == ':');
}
/// Return true iff path is a UNCW path.
static bool
uncw_path(const string & path)
{
return (path.size() >= 4 && memcmp(path.data(), "\\\\?\\", 4) == 0);
}
static inline bool slash(char ch)
{
return ch == '/' || ch == '\\';
}
#endif
void
resolve_relative_path(string & path, const string & base)
{
#ifndef __WIN32__
if (path.empty() || path[0] != '/') {
// path is relative.
string::size_type last_slash = base.rfind('/');
if (last_slash != string::npos)
path.insert(0, base, 0, last_slash + 1);
}
#else
// Microsoft Windows paths may begin with a drive letter but still be
// relative within that drive.
bool drive = has_drive(path);
string::size_type p = (drive ? 2 : 0);
bool absolute = (p != path.size() && slash(path[p]));
if (absolute) {
// If path is absolute and has a drive specifier, just return it.
if (drive)
return;
// If base has a drive specifier prepend that to path.
if (has_drive(base)) {
path.insert(0, base, 0, 2);
return;
}
// If base has a UNC (\\SERVER\\VOLUME) or \\?\ prefix, prepend that
// to path.
if (uncw_path(base)) {
string::size_type sl = 0;
if (base.size() >= 7 && memcmp(base.data() + 5, ":\\", 2) == 0) {
// "\\?\X:\"
sl = 6;
} else if (base.size() >= 8 &&
memcmp(base.data() + 4, "UNC\\", 4) == 0) {
// "\\?\UNC\server\volume\"
sl = base.find('\\', 8);
if (sl != string::npos)
sl = base.find('\\', sl + 1);
}
if (sl) {
// With the \\?\ prefix, '/' isn't recognised so change it
// to '\' in path.
string::iterator i;
for (i = path.begin(); i != path.end(); ++i) {
if (*i == '/')
*i = '\\';
}
path.insert(0, base, 0, sl);
}
} else if (base.size() >= 5 && slash(base[0]) && slash(base[1])) {
// Handle UNC base.
string::size_type sl = base.find_first_of("/\\", 2);
if (sl != string::npos) {
sl = base.find_first_of("/\\", sl + 1);
path.insert(0, base, 0, sl);
}
}
return;
}
// path is relative, so if it has no drive specifier or the same drive
// specifier as base, then we want to qualify it using base.
bool base_drive = has_drive(base);
if (!drive || (base_drive && (path[0] | 32) == (base[0] | 32))) {
string::size_type last_slash = base.find_last_of("/\\");
if (last_slash == string::npos && !drive && base_drive)
last_slash = 1;
if (last_slash != string::npos) {
string::size_type b = (drive && base_drive ? 2 : 0);
if (uncw_path(base)) {
// With the \\?\ prefix, '/' isn't recognised so change it
// to '\' in path.
string::iterator i;
for (i = path.begin(); i != path.end(); ++i) {
if (*i == '/')
*i = '\\';
}
}
path.insert(b, base, b, last_slash + 1 - b);
}
}
#endif
}
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