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// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.
// Maintainers, keep in mind that octal literals are not allowed
// in strict mode. Use the decimal value and add a comment with
// the octal value. Example:
//
// var mode = 438; /* mode=0666 */
var util = require('util');
var pathModule = require('path');
var binding = process.binding('fs');
var constants = process.binding('constants');
var fs = exports;
var Stream = require('stream').Stream;
var EventEmitter = require('events').EventEmitter;
var kMinPoolSpace = 128;
var kPoolSize = 40 * 1024;
var O_APPEND = constants.O_APPEND || 0;
var O_CREAT = constants.O_CREAT || 0;
var O_DIRECTORY = constants.O_DIRECTORY || 0;
var O_EXCL = constants.O_EXCL || 0;
var O_NOCTTY = constants.O_NOCTTY || 0;
var O_NOFOLLOW = constants.O_NOFOLLOW || 0;
var O_RDONLY = constants.O_RDONLY || 0;
var O_RDWR = constants.O_RDWR || 0;
var O_SYMLINK = constants.O_SYMLINK || 0;
var O_SYNC = constants.O_SYNC || 0;
var O_TRUNC = constants.O_TRUNC || 0;
var O_WRONLY = constants.O_WRONLY || 0;
fs.Stats = binding.Stats;
fs.Stats.prototype._checkModeProperty = function(property) {
return ((this.mode & constants.S_IFMT) === property);
};
fs.Stats.prototype.isDirectory = function() {
return this._checkModeProperty(constants.S_IFDIR);
};
fs.Stats.prototype.isFile = function() {
return this._checkModeProperty(constants.S_IFREG);
};
fs.Stats.prototype.isBlockDevice = function() {
return this._checkModeProperty(constants.S_IFBLK);
};
fs.Stats.prototype.isCharacterDevice = function() {
return this._checkModeProperty(constants.S_IFCHR);
};
fs.Stats.prototype.isSymbolicLink = function() {
return this._checkModeProperty(constants.S_IFLNK);
};
fs.Stats.prototype.isFIFO = function() {
return this._checkModeProperty(constants.S_IFIFO);
};
fs.Stats.prototype.isSocket = function() {
return this._checkModeProperty(constants.S_IFSOCK);
};
fs.exists = function(path, callback) {
binding.stat(path, function(err, stats) {
if (callback) callback(err ? false : true);
});
};
fs.existsSync = function(path) {
try {
binding.stat(path);
return true;
} catch (e) {
return false;
}
};
fs.readFile = function(path, encoding_) {
var encoding = typeof(encoding_) === 'string' ? encoding_ : null;
var callback = arguments[arguments.length - 1];
if (typeof(callback) !== 'function') callback = noop;
var readStream = fs.createReadStream(path);
var buffers = [];
var nread = 0;
readStream.on('data', function(chunk) {
buffers.push(chunk);
nread += chunk.length;
});
readStream.on('error', function(er) {
callback(er);
readStream.destroy();
});
readStream.on('end', function() {
// copy all the buffers into one
var buffer;
switch (buffers.length) {
case 0: buffer = new Buffer(0); break;
case 1: buffer = buffers[0]; break;
default: // concat together
buffer = new Buffer(nread);
var n = 0;
buffers.forEach(function(b) {
var l = b.length;
b.copy(buffer, n, 0, l);
n += l;
});
break;
}
if (encoding) {
try {
buffer = buffer.toString(encoding);
} catch (er) {
return callback(er);
}
}
callback(null, buffer);
});
};
fs.readFileSync = function(path, encoding) {
var fd = fs.openSync(path, constants.O_RDONLY, 438 /*=0666*/);
var buffer = new Buffer(4048);
var buffers = [];
var nread = 0;
var lastRead = 0;
do {
if (lastRead) {
buffer._bytesRead = lastRead;
nread += lastRead;
buffers.push(buffer);
}
var buffer = new Buffer(4048);
lastRead = fs.readSync(fd, buffer, 0, buffer.length, null);
} while (lastRead > 0);
fs.closeSync(fd);
if (buffers.length > 1) {
var offset = 0;
var i;
buffer = new Buffer(nread);
buffers.forEach(function(i) {
if (!i._bytesRead) return;
i.copy(buffer, offset, 0, i._bytesRead);
offset += i._bytesRead;
});
} else if (buffers.length) {
// buffers has exactly 1 (possibly zero length) buffer, so this should
// be a shortcut
buffer = buffers[0].slice(0, buffers[0]._bytesRead);
} else {
buffer = new Buffer(0);
}
if (encoding) buffer = buffer.toString(encoding);
return buffer;
};
// Used by binding.open and friends
function stringToFlags(flag) {
// Only mess with strings
if (typeof flag !== 'string') {
return flag;
}
// O_EXCL is mandated by POSIX, Windows supports it too.
// Let's add a check anyway, just in case.
if (!O_EXCL && ~flag.indexOf('x')) {
throw errnoException('ENOSYS', 'fs.open(O_EXCL)');
}
switch (flag) {
case 'r' : return O_RDONLY;
case 'r+' : return O_RDWR;
case 'w' : return O_TRUNC | O_CREAT | O_WRONLY;
case 'wx' : // fall through
case 'xw' : return O_TRUNC | O_CREAT | O_WRONLY | O_EXCL;
case 'w+' : return O_TRUNC | O_CREAT | O_RDWR;
case 'wx+': // fall through
case 'xw+': return O_TRUNC | O_CREAT | O_RDWR | O_EXCL;
case 'a' : return O_APPEND | O_CREAT | O_WRONLY;
case 'ax' : // fall through
case 'xa' : return O_APPEND | O_CREAT | O_WRONLY | O_EXCL;
case 'a+' : return O_APPEND | O_CREAT | O_RDWR;
case 'ax+': // fall through
case 'xa+': return O_APPEND | O_CREAT | O_RDWR | O_EXCL;
}
throw new Error('Unknown file open flag: ' + flag);
}
// exported but hidden, only used by test/simple/test-fs-open-flags.js
Object.defineProperty(exports, '_stringToFlags', {
enumerable: false,
value: stringToFlags
});
function noop() {}
// Yes, the follow could be easily DRYed up but I provide the explicit
// list to make the arguments clear.
fs.close = function(fd, callback) {
binding.close(fd, callback || noop);
};
fs.closeSync = function(fd) {
return binding.close(fd);
};
function modeNum(m, def) {
switch (typeof m) {
case 'number': return m;
case 'string': return parseInt(m, 8);
default:
if (def) {
return modeNum(def);
} else {
return undefined;
}
}
}
fs.open = function(path, flags, mode, callback) {
callback = arguments[arguments.length - 1];
if (typeof(callback) !== 'function') {
callback = noop;
}
mode = modeNum(mode, 438 /*=0666*/);
binding.open(pathModule._makeLong(path), stringToFlags(flags), mode,
callback);
};
fs.openSync = function(path, flags, mode) {
mode = modeNum(mode, 438 /*=0666*/);
return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
};
fs.read = function(fd, buffer, offset, length, position, callback) {
if (!Buffer.isBuffer(buffer)) {
// legacy string interface (fd, length, position, encoding, callback)
var cb = arguments[4],
encoding = arguments[3];
position = arguments[2];
length = arguments[1];
buffer = new Buffer(length);
offset = 0;
callback = function(err, bytesRead) {
if (!cb) return;
var str = (bytesRead > 0) ? buffer.toString(encoding, 0, bytesRead) : '';
(cb)(err, str, bytesRead);
};
}
function wrapper(err, bytesRead) {
// Retain a reference to buffer so that it can't be GC'ed too soon.
callback && callback(err, bytesRead || 0, buffer);
}
binding.read(fd, buffer, offset, length, position, wrapper);
};
fs.readSync = function(fd, buffer, offset, length, position) {
var legacy = false;
if (!Buffer.isBuffer(buffer)) {
// legacy string interface (fd, length, position, encoding, callback)
legacy = true;
var encoding = arguments[3];
position = arguments[2];
length = arguments[1];
buffer = new Buffer(length);
offset = 0;
}
var r = binding.read(fd, buffer, offset, length, position);
if (!legacy) {
return r;
}
var str = (r > 0) ? buffer.toString(encoding, 0, r) : '';
return [str, r];
};
fs.write = function(fd, buffer, offset, length, position, callback) {
if (!Buffer.isBuffer(buffer)) {
// legacy string interface (fd, data, position, encoding, callback)
callback = arguments[4];
position = arguments[2];
buffer = new Buffer('' + arguments[1], arguments[3]);
offset = 0;
length = buffer.length;
}
if (!length) {
if (typeof callback == 'function') {
process.nextTick(function() {
callback(undefined, 0);
});
}
return;
}
function wrapper(err, written) {
// Retain a reference to buffer so that it can't be GC'ed too soon.
callback && callback(err, written || 0, buffer);
}
binding.write(fd, buffer, offset, length, position, wrapper);
};
fs.writeSync = function(fd, buffer, offset, length, position) {
if (!Buffer.isBuffer(buffer)) {
// legacy string interface (fd, data, position, encoding)
position = arguments[2];
buffer = new Buffer('' + arguments[1], arguments[3]);
offset = 0;
length = buffer.length;
}
if (!length) return 0;
return binding.write(fd, buffer, offset, length, position);
};
fs.rename = function(oldPath, newPath, callback) {
binding.rename(pathModule._makeLong(oldPath), pathModule._makeLong(newPath),
callback || noop);
};
fs.renameSync = function(oldPath, newPath) {
return binding.rename(pathModule._makeLong(oldPath),
pathModule._makeLong(newPath));
};
fs.truncate = function(fd, len, callback) {
binding.truncate(fd, len, callback || noop);
};
fs.truncateSync = function(fd, len) {
return binding.truncate(fd, len);
};
fs.rmdir = function(path, callback) {
binding.rmdir(pathModule._makeLong(path), callback || noop);
};
fs.rmdirSync = function(path) {
return binding.rmdir(pathModule._makeLong(path));
};
fs.fdatasync = function(fd, callback) {
binding.fdatasync(fd, callback || noop);
};
fs.fdatasyncSync = function(fd) {
return binding.fdatasync(fd);
};
fs.fsync = function(fd, callback) {
binding.fsync(fd, callback || noop);
};
fs.fsyncSync = function(fd) {
return binding.fsync(fd);
};
fs.mkdir = function(path, mode, callback) {
if (typeof mode === 'function') callback = mode;
binding.mkdir(pathModule._makeLong(path), modeNum(mode, 511 /*=0777*/),
callback || noop);
};
fs.mkdirSync = function(path, mode) {
return binding.mkdir(pathModule._makeLong(path),
modeNum(mode, 511 /*=0777*/));
};
fs.sendfile = function(outFd, inFd, inOffset, length, callback) {
binding.sendfile(outFd, inFd, inOffset, length, callback || noop);
};
fs.sendfileSync = function(outFd, inFd, inOffset, length) {
return binding.sendfile(outFd, inFd, inOffset, length);
};
fs.readdir = function(path, callback) {
binding.readdir(pathModule._makeLong(path), callback || noop);
};
fs.readdirSync = function(path) {
return binding.readdir(pathModule._makeLong(path));
};
fs.fstat = function(fd, callback) {
binding.fstat(fd, callback || noop);
};
fs.lstat = function(path, callback) {
binding.lstat(pathModule._makeLong(path), callback || noop);
};
fs.stat = function(path, callback) {
binding.stat(pathModule._makeLong(path), callback || noop);
};
fs.fstatSync = function(fd) {
return binding.fstat(fd);
};
fs.lstatSync = function(path) {
return binding.lstat(pathModule._makeLong(path));
};
fs.statSync = function(path) {
return binding.stat(pathModule._makeLong(path));
};
fs.readlink = function(path, callback) {
binding.readlink(pathModule._makeLong(path), callback || noop);
};
fs.readlinkSync = function(path) {
return binding.readlink(pathModule._makeLong(path));
};
fs.symlink = function(destination, path, type_, callback) {
var type = (typeof(type_) == 'string' ? type_ : null);
var callback_ = arguments[arguments.length - 1];
callback = (typeof(callback_) == 'function' ? callback_ : null);
binding.symlink(pathModule._makeLong(destination),
pathModule._makeLong(path), type, callback);
};
fs.symlinkSync = function(destination, path, type) {
return binding.symlink(pathModule._makeLong(destination),
pathModule._makeLong(path), type);
};
fs.link = function(srcpath, dstpath, callback) {
binding.link(pathModule._makeLong(srcpath), pathModule._makeLong(dstpath),
callback || noop);
};
fs.linkSync = function(srcpath, dstpath) {
return binding.link(pathModule._makeLong(srcpath),
pathModule._makeLong(dstpath));
};
fs.unlink = function(path, callback) {
binding.unlink(pathModule._makeLong(path), callback || noop);
};
fs.unlinkSync = function(path) {
return binding.unlink(pathModule._makeLong(path));
};
fs.fchmod = function(fd, mode, callback) {
binding.fchmod(fd, modeNum(mode), callback || noop);
};
fs.fchmodSync = function(fd, mode) {
return binding.fchmod(fd, modeNum(mode));
};
if (constants.hasOwnProperty('O_SYMLINK')) {
fs.lchmod = function(path, mode, callback) {
callback = callback || noop;
fs.open(path, constants.O_WRONLY | constants.O_SYMLINK, function(err, fd) {
if (err) {
callback(err);
return;
}
// prefer to return the chmod error, if one occurs,
// but still try to close, and report closing errors if they occur.
fs.fchmod(fd, mode, function(err) {
fs.close(fd, function(err2) {
callback(err || err2);
});
});
});
};
fs.lchmodSync = function(path, mode) {
var fd = fs.openSync(path, constants.O_WRONLY | constants.O_SYMLINK);
// prefer to return the chmod error, if one occurs,
// but still try to close, and report closing errors if they occur.
var err, err2;
try {
var ret = fs.fchmodSync(fd, mode);
} catch (er) {
err = er;
}
try {
fs.closeSync(fd);
} catch (er) {
err2 = er;
}
if (err || err2) throw (err || err2);
return ret;
};
}
fs.chmod = function(path, mode, callback) {
binding.chmod(pathModule._makeLong(path), modeNum(mode), callback || noop);
};
fs.chmodSync = function(path, mode) {
return binding.chmod(pathModule._makeLong(path), modeNum(mode));
};
if (constants.hasOwnProperty('O_SYMLINK')) {
fs.lchown = function(path, uid, gid, callback) {
callback = callback || noop;
fs.open(path, constants.O_WRONLY | constants.O_SYMLINK, function(err, fd) {
if (err) {
callback(err);
return;
}
fs.fchown(fd, uid, gid, callback);
});
};
fs.lchownSync = function(path, uid, gid) {
var fd = fs.openSync(path, constants.O_WRONLY | constants.O_SYMLINK);
return fs.fchownSync(fd, uid, gid);
};
}
fs.fchown = function(fd, uid, gid, callback) {
binding.fchown(fd, uid, gid, callback || noop);
};
fs.fchownSync = function(fd, uid, gid) {
return binding.fchown(fd, uid, gid);
};
fs.chown = function(path, uid, gid, callback) {
binding.chown(pathModule._makeLong(path), uid, gid, callback || noop);
};
fs.chownSync = function(path, uid, gid) {
return binding.chown(pathModule._makeLong(path), uid, gid);
};
// converts Date or number to a fractional UNIX timestamp
function toUnixTimestamp(time) {
if (typeof time == 'number') {
return time;
}
if (time instanceof Date) {
// convert to 123.456 UNIX timestamp
return time.getTime() / 1000;
}
throw new Error('Cannot parse time: ' + time);
}
// exported for unit tests, not for public consumption
fs._toUnixTimestamp = toUnixTimestamp;
fs.utimes = function(path, atime, mtime, callback) {
atime = toUnixTimestamp(atime);
mtime = toUnixTimestamp(mtime);
binding.utimes(pathModule._makeLong(path), atime, mtime, callback || noop);
};
fs.utimesSync = function(path, atime, mtime) {
atime = toUnixTimestamp(atime);
mtime = toUnixTimestamp(mtime);
binding.utimes(pathModule._makeLong(path), atime, mtime);
};
fs.futimes = function(fd, atime, mtime, callback) {
atime = toUnixTimestamp(atime);
mtime = toUnixTimestamp(mtime);
binding.futimes(fd, atime, mtime, callback || noop);
};
fs.futimesSync = function(fd, atime, mtime) {
atime = toUnixTimestamp(atime);
mtime = toUnixTimestamp(mtime);
binding.futimes(fd, atime, mtime);
};
function writeAll(fd, buffer, offset, length, position, callback) {
var callback_ = arguments[arguments.length - 1];
callback = (typeof(callback_) == 'function' ? callback_ : null);
// write(fd, buffer, offset, length, position, callback)
fs.write(fd, buffer, offset, length, position, function(writeErr, written) {
if (writeErr) {
fs.close(fd, function() {
if (callback) callback(writeErr);
});
} else {
if (written === length) {
fs.close(fd, callback);
} else {
writeAll(fd, buffer, offset + written, length - written, position + written, callback);
}
}
});
}
fs.writeFile = function(path, data, encoding_, callback) {
var encoding = (typeof(encoding_) == 'string' ? encoding_ : 'utf8');
var callback_ = arguments[arguments.length - 1];
callback = (typeof(callback_) == 'function' ? callback_ : null);
fs.open(path, 'w', 438 /*=0666*/, function(openErr, fd) {
if (openErr) {
if (callback) callback(openErr);
} else {
var buffer = Buffer.isBuffer(data) ? data : new Buffer('' + data,
encoding);
writeAll(fd, buffer, 0, buffer.length, 0, callback);
}
});
};
fs.writeFileSync = function(path, data, encoding) {
var fd = fs.openSync(path, 'w');
if (!Buffer.isBuffer(data)) {
data = new Buffer('' + data, encoding || 'utf8');
}
var written = 0;
var length = data.length;
//writeSync(fd, buffer, offset, length, position)
while (written < length) {
written += fs.writeSync(fd, data, written, length - written, written);
}
fs.closeSync(fd);
};
fs.appendFile = function(path, data, encoding_, callback) {
var encoding = (typeof(encoding_) == 'string' ? encoding_ : 'utf8');
var callback_ = arguments[arguments.length - 1];
callback = (typeof(callback_) == 'function' ? callback_ : null);
fs.open(path, 'a', 438 /*=0666*/, function(err, fd) {
if (err) return callback(err);
var buffer = Buffer.isBuffer(data) ? data : new Buffer('' + data, encoding);
writeAll(fd, buffer, 0, buffer.length, null, callback);
});
};
fs.appendFileSync = function(path, data, encoding) {
var fd = fs.openSync(path, 'a');
if (!Buffer.isBuffer(data)) {
data = new Buffer('' + data, encoding || 'utf8');
}
var written = 0;
var position = null;
var length = data.length;
while (written < length) {
try {
written += fs.writeSync(fd, data, written, length - written, position);
} catch (e) {
try {
fs.closeSync(fd);
} catch (e) {
// swallow exception
}
throw e;
}
position += written;
}
fs.closeSync(fd);
};
function errnoException(errorno, syscall) {
// TODO make this more compatible with ErrnoException from src/node.cc
// Once all of Node is using this function the ErrnoException from
// src/node.cc should be removed.
var e = new Error(syscall + ' ' + errorno);
e.errno = e.code = errorno;
e.syscall = syscall;
return e;
}
function FSWatcher() {
var self = this;
var FSEvent = process.binding('fs_event_wrap').FSEvent;
this._handle = new FSEvent();
this._handle.onchange = function(status, event, filename) {
if (status) {
self.emit('error', errnoException(errno, 'watch'));
} else {
self.emit('change', event, filename);
}
};
}
util.inherits(FSWatcher, EventEmitter);
FSWatcher.prototype.start = function(filename, persistent) {
var r = this._handle.start(pathModule._makeLong(filename), persistent);
if (r) {
this._handle.close();
throw errnoException(errno, 'watch');
}
};
FSWatcher.prototype.close = function() {
this._handle.close();
};
fs.watch = function(filename) {
var watcher;
var options;
var listener;
if ('object' == typeof arguments[1]) {
options = arguments[1];
listener = arguments[2];
} else {
options = {};
listener = arguments[1];
}
if (!listener) {
throw new Error('watch requires a listener function');
}
if (options.persistent === undefined) options.persistent = true;
watcher = new FSWatcher();
watcher.start(filename, options.persistent);
watcher.addListener('change', listener);
return watcher;
};
// Stat Change Watchers
function StatWatcher() {
var self = this;
this._handle = new binding.StatWatcher();
this._handle.onchange = function(current, previous) {
self.emit('change', current, previous);
};
this._handle.onstop = function() {
self.emit('stop');
};
}
util.inherits(StatWatcher, EventEmitter);
StatWatcher.prototype.start = function(filename, persistent, interval) {
this._handle.start(pathModule._makeLong(filename), persistent, interval);
};
StatWatcher.prototype.stop = function() {
this._handle.stop();
};
var statWatchers = {};
function inStatWatchers(filename) {
return Object.prototype.hasOwnProperty.call(statWatchers, filename) &&
statWatchers[filename];
}
fs.watchFile = function(filename) {
if (isWindows) {
throw new Error('use fs.watch api instead');
}
var stat;
var options;
var listener;
if ('object' == typeof arguments[1]) {
options = arguments[1];
listener = arguments[2];
} else {
options = {};
listener = arguments[1];
}
if (!listener) {
throw new Error('watchFile requires a listener function');
}
if (options.persistent === undefined) options.persistent = true;
if (options.interval === undefined) options.interval = 0;
if (inStatWatchers(filename)) {
stat = statWatchers[filename];
} else {
stat = statWatchers[filename] = new StatWatcher();
stat.start(filename, options.persistent, options.interval);
}
stat.addListener('change', listener);
return stat;
};
fs.unwatchFile = function(filename) {
var stat;
if (inStatWatchers(filename)) {
stat = statWatchers[filename];
stat.stop();
statWatchers[filename] = undefined;
}
};
// Realpath
// Not using realpath(2) because it's bad.
// See: http://insanecoding.blogspot.com/2007/11/pathmax-simply-isnt.html
var normalize = pathModule.normalize,
isWindows = process.platform === 'win32';
if (isWindows) {
// Node doesn't support symlinks / lstat on windows. Hence realpath is just
// the same as path.resolve that fails if the path doesn't exists.
// windows version
fs.realpathSync = function realpathSync(p, cache) {
p = pathModule.resolve(p);
if (cache && Object.prototype.hasOwnProperty.call(cache, p)) {
return cache[p];
}
fs.statSync(p);
if (cache) cache[p] = p;
return p;
};
// windows version
fs.realpath = function(p, cache, cb) {
if (typeof cb !== 'function') {
cb = cache;
cache = null;
}
p = pathModule.resolve(p);
if (cache && Object.prototype.hasOwnProperty.call(cache, p)) {
return cb(null, cache[p]);
}
fs.stat(p, function(err) {
if (err) return cb(err);
if (cache) cache[p] = p;
cb(null, p);
});
};
} else /* posix */ {
// Regexp that finds the next partion of a (partial) path
// result is [base_with_slash, base], e.g. ['somedir/', 'somedir']
var nextPartRe = /(.*?)(?:[\/]+|$)/g;
// posix version
fs.realpathSync = function realpathSync(p, cache) {
// make p is absolute
p = pathModule.resolve(p);
if (cache && Object.prototype.hasOwnProperty.call(cache, p)) {
return cache[p];
}
var original = p,
seenLinks = {},
knownHard = {};
// current character position in p
var pos = 0;
// the partial path so far, including a trailing slash if any
var current = '';
// the partial path without a trailing slash
var base = '';
// the partial path scanned in the previous round, with slash
var previous = '';
// walk down the path, swapping out linked pathparts for their real
// values
// NB: p.length changes.
while (pos < p.length) {
// find the next part
nextPartRe.lastIndex = pos;
var result = nextPartRe.exec(p);
previous = current;
current += result[0];
base = previous + result[1];
pos = nextPartRe.lastIndex;
// continue if not a symlink, or if root
if (!base || knownHard[base] || (cache && cache[base] === base)) {
continue;
}
var resolvedLink;
if (cache && Object.prototype.hasOwnProperty.call(cache, base)) {
// some known symbolic link. no need to stat again.
resolvedLink = cache[base];
} else {
var stat = fs.lstatSync(base);
if (!stat.isSymbolicLink()) {
knownHard[base] = true;
if (cache) cache[base] = base;
continue;
}
// read the link if it wasn't read before
var id = stat.dev.toString(32) + ':' + stat.ino.toString(32);
if (!seenLinks[id]) {
fs.statSync(base);
seenLinks[id] = fs.readlinkSync(base);
resolvedLink = pathModule.resolve(previous, seenLinks[id]);
// track this, if given a cache.
if (cache) cache[base] = resolvedLink;
}
}
// resolve the link, then start over
p = pathModule.resolve(resolvedLink, p.slice(pos));
pos = 0;
previous = base = current = '';
}
if (cache) cache[original] = p;
return p;
};
// posix version
fs.realpath = function realpath(p, cache, cb) {
if (typeof cb !== 'function') {
cb = cache;
cache = null;
}
// make p is absolute
p = pathModule.resolve(p);
if (cache && Object.prototype.hasOwnProperty.call(cache, p)) {
return cb(null, cache[p]);
}
var original = p,
seenLinks = {},
knownHard = {};
// current character position in p
var pos = 0;
// the partial path so far, including a trailing slash if any
var current = '';
// the partial path without a trailing slash
var base = '';
// the partial path scanned in the previous round, with slash
var previous = '';