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library.js
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library.js
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//"use strict";
// An implementation of a libc for the web. Basically, implementations of
// the various standard C libraries, that can be called from compiled code,
// and work using the actual JavaScript environment.
//
// We search the Library object when there is an external function. If the
// entry in the Library is a function, we insert it. If it is a string, we
// do another lookup in the library (a simple way to write a function once,
// if it can be called by different names). We also allow dependencies,
// using __deps. Initialization code to be run after allocating all
// global constants can be defined by __postset.
//
// Note that the full function name will be '_' + the name in the Library
// object. For convenience, the short name appears here. Note that if you add a
// new function with an '_', it will not be found.
LibraryManager.library = {
// ==========================================================================
// File system base.
// ==========================================================================
stdin: 0,
stdout: 0,
stderr: 0,
_impure_ptr: 0,
$FS__deps: ['$ERRNO_CODES', '__setErrNo', 'stdin', 'stdout', 'stderr', '_impure_ptr'],
$FS__postset: '__ATINIT__.unshift({ func: function() { if (!Module["noFSInit"] && !FS.init.initialized) FS.init() } });' +
'__ATMAIN__.push({ func: function() { FS.ignorePermissions = false } });' +
'__ATEXIT__.push({ func: function() { FS.quit() } });' +
// export some names through closure
'Module["FS_createFolder"] = FS.createFolder;' +
'Module["FS_createPath"] = FS.createPath;' +
'Module["FS_createDataFile"] = FS.createDataFile;' +
'Module["FS_createPreloadedFile"] = FS.createPreloadedFile;' +
'Module["FS_createLazyFile"] = FS.createLazyFile;' +
'Module["FS_createLink"] = FS.createLink;' +
'Module["FS_createDevice"] = FS.createDevice;',
$FS: {
// The path to the current folder.
currentPath: '/',
// The inode to assign to the next created object.
nextInode: 2,
// Currently opened file or directory streams. Padded with null so the zero
// index is unused, as the indices are used as pointers. This is not split
// into separate fileStreams and folderStreams lists because the pointers
// must be interchangeable, e.g. when used in fdopen().
// streams is kept as a dense array. It may contain |null| to fill in
// holes, however.
streams: [null],
#if ASSERTIONS
checkStreams: function() {
for (var i in FS.streams) assert(i >= 0 && i < FS.streams.length); // no keys not in dense span
for (var i = 0; i < FS.streams.length; i++) assert(typeof FS.streams[i] == 'object'); // no non-null holes in dense span
},
#endif
// Whether we are currently ignoring permissions. Useful when preparing the
// filesystem and creating files inside read-only folders.
// This is set to false when the runtime is initialized, allowing you
// to modify the filesystem freely before run() is called.
ignorePermissions: true,
joinPath: function(parts, forceRelative) {
var ret = parts[0];
for (var i = 1; i < parts.length; i++) {
if (ret[ret.length-1] != '/') ret += '/';
ret += parts[i];
}
if (forceRelative && ret[0] == '/') ret = ret.substr(1);
return ret;
},
// Converts any path to an absolute path. Resolves embedded "." and ".."
// parts.
absolutePath: function(relative, base) {
if (typeof relative !== 'string') return null;
if (base === undefined) base = FS.currentPath;
if (relative && relative[0] == '/') base = '';
var full = base + '/' + relative;
var parts = full.split('/').reverse();
var absolute = [''];
while (parts.length) {
var part = parts.pop();
if (part == '' || part == '.') {
// Nothing.
} else if (part == '..') {
if (absolute.length > 1) absolute.pop();
} else {
absolute.push(part);
}
}
return absolute.length == 1 ? '/' : absolute.join('/');
},
// Analyzes a relative or absolute path returning a description, containing:
// isRoot: Whether the path points to the root.
// exists: Whether the object at the path exists.
// error: If !exists, this will contain the errno code of the cause.
// name: The base name of the object (null if !parentExists).
// path: The absolute path to the object, with all links resolved.
// object: The filesystem record of the object referenced by the path.
// parentExists: Whether the parent of the object exist and is a folder.
// parentPath: The absolute path to the parent folder.
// parentObject: The filesystem record of the parent folder.
analyzePath: function(path, dontResolveLastLink, linksVisited) {
var ret = {
isRoot: false,
exists: false,
error: 0,
name: null,
path: null,
object: null,
parentExists: false,
parentPath: null,
parentObject: null
};
#if FS_LOG
var inputPath = path;
function log() {
Module['print']('FS.analyzePath("' + inputPath + '", ' +
dontResolveLastLink + ', ' +
linksVisited + ') => {' +
'isRoot: ' + ret.isRoot + ', ' +
'exists: ' + ret.exists + ', ' +
'error: ' + ret.error + ', ' +
'name: "' + ret.name + '", ' +
'path: "' + ret.path + '", ' +
'object: ' + ret.object + ', ' +
'parentExists: ' + ret.parentExists + ', ' +
'parentPath: "' + ret.parentPath + '", ' +
'parentObject: ' + ret.parentObject + '}');
}
#endif
path = FS.absolutePath(path);
if (path == '/') {
ret.isRoot = true;
ret.exists = ret.parentExists = true;
ret.name = '/';
ret.path = ret.parentPath = '/';
ret.object = ret.parentObject = FS.root;
} else if (path !== null) {
linksVisited = linksVisited || 0;
path = path.slice(1).split('/');
var current = FS.root;
var traversed = [''];
while (path.length) {
if (path.length == 1 && current.isFolder) {
ret.parentExists = true;
ret.parentPath = traversed.length == 1 ? '/' : traversed.join('/');
ret.parentObject = current;
ret.name = path[0];
}
var target = path.shift();
if (!current.isFolder) {
ret.error = ERRNO_CODES.ENOTDIR;
break;
} else if (!current.read) {
ret.error = ERRNO_CODES.EACCES;
break;
} else if (!current.contents.hasOwnProperty(target)) {
ret.error = ERRNO_CODES.ENOENT;
break;
}
current = current.contents[target];
if (current.link && !(dontResolveLastLink && path.length == 0)) {
if (linksVisited > 40) { // Usual Linux SYMLOOP_MAX.
ret.error = ERRNO_CODES.ELOOP;
break;
}
var link = FS.absolutePath(current.link, traversed.join('/'));
ret = FS.analyzePath([link].concat(path).join('/'),
dontResolveLastLink, linksVisited + 1);
#if FS_LOG
log();
#endif
return ret;
}
traversed.push(target);
if (path.length == 0) {
ret.exists = true;
ret.path = traversed.join('/');
ret.object = current;
}
}
}
#if FS_LOG
log();
#endif
return ret;
},
// Finds the file system object at a given path. If dontResolveLastLink is
// set to true and the object is a symbolic link, it will be returned as is
// instead of being resolved. Links embedded in the path are still resolved.
findObject: function(path, dontResolveLastLink) {
FS.ensureRoot();
var ret = FS.analyzePath(path, dontResolveLastLink);
if (ret.exists) {
return ret.object;
} else {
___setErrNo(ret.error);
return null;
}
},
// Creates a file system record: file, link, device or folder.
createObject: function(parent, name, properties, canRead, canWrite) {
#if FS_LOG
Module['print']('FS.createObject("' + parent + '", ' +
'"' + name + '", ' +
JSON.stringify(properties) + ', ' +
canRead + ', ' +
canWrite + ')');
#endif
if (!parent) parent = '/';
if (typeof parent === 'string') parent = FS.findObject(parent);
if (!parent) {
___setErrNo(ERRNO_CODES.EACCES);
throw new Error('Parent path must exist.');
}
if (!parent.isFolder) {
___setErrNo(ERRNO_CODES.ENOTDIR);
throw new Error('Parent must be a folder.');
}
if (!parent.write && !FS.ignorePermissions) {
___setErrNo(ERRNO_CODES.EACCES);
throw new Error('Parent folder must be writeable.');
}
if (!name || name == '.' || name == '..') {
___setErrNo(ERRNO_CODES.ENOENT);
throw new Error('Name must not be empty.');
}
if (parent.contents.hasOwnProperty(name)) {
___setErrNo(ERRNO_CODES.EEXIST);
throw new Error("Can't overwrite object.");
}
parent.contents[name] = {
read: canRead === undefined ? true : canRead,
write: canWrite === undefined ? false : canWrite,
timestamp: Date.now(),
inodeNumber: FS.nextInode++
};
for (var key in properties) {
if (properties.hasOwnProperty(key)) {
parent.contents[name][key] = properties[key];
}
}
return parent.contents[name];
},
// Creates a folder.
createFolder: function(parent, name, canRead, canWrite) {
var properties = {isFolder: true, isDevice: false, contents: {}};
return FS.createObject(parent, name, properties, canRead, canWrite);
},
// Creates a a folder and all its missing parents.
createPath: function(parent, path, canRead, canWrite) {
var current = FS.findObject(parent);
if (current === null) throw new Error('Invalid parent.');
path = path.split('/').reverse();
while (path.length) {
var part = path.pop();
if (!part) continue;
if (!current.contents.hasOwnProperty(part)) {
FS.createFolder(current, part, canRead, canWrite);
}
current = current.contents[part];
}
return current;
},
// Creates a file record, given specific properties.
createFile: function(parent, name, properties, canRead, canWrite) {
properties.isFolder = false;
return FS.createObject(parent, name, properties, canRead, canWrite);
},
// Creates a file record from existing data.
createDataFile: function(parent, name, data, canRead, canWrite) {
if (typeof data === 'string') {
var dataArray = new Array(data.length);
for (var i = 0, len = data.length; i < len; ++i) dataArray[i] = data.charCodeAt(i);
data = dataArray;
}
var properties = {
isDevice: false,
contents: data.subarray ? data.subarray(0) : data // as an optimization, create a new array wrapper (not buffer) here, to help JS engines understand this object
};
return FS.createFile(parent, name, properties, canRead, canWrite);
},
// Creates a file record for lazy-loading from a URL. XXX This requires a synchronous
// XHR, which is not possible in browsers except in a web worker! Use preloading,
// either --preload-file in emcc or FS.createPreloadedFile
createLazyFile: function(parent, name, url, canRead, canWrite) {
if (typeof XMLHttpRequest !== 'undefined') {
if (!ENVIRONMENT_IS_WORKER) throw 'Cannot do synchronous binary XHRs outside webworkers in modern browsers. Use --embed-file or --preload-file in emcc';
// Lazy chunked Uint8Array (implements get and length from Uint8Array). Actual getting is abstracted away for eventual reuse.
var LazyUint8Array = function(chunkSize, length) {
this.length = length;
this.chunkSize = chunkSize;
this.chunks = []; // Loaded chunks. Index is the chunk number
}
LazyUint8Array.prototype.get = function(idx) {
if (idx > this.length-1 || idx < 0) {
return undefined;
}
var chunkOffset = idx % chunkSize;
var chunkNum = Math.floor(idx / chunkSize);
return this.getter(chunkNum)[chunkOffset];
}
LazyUint8Array.prototype.setDataGetter = function(getter) {
this.getter = getter;
}
// Find length
var xhr = new XMLHttpRequest();
xhr.open('HEAD', url, false);
xhr.send(null);
if (!(xhr.status >= 200 && xhr.status < 300 || xhr.status === 304)) throw new Error("Couldn't load " + url + ". Status: " + xhr.status);
var datalength = Number(xhr.getResponseHeader("Content-length"));
var header;
var hasByteServing = (header = xhr.getResponseHeader("Accept-Ranges")) && header === "bytes";
#if SMALL_XHR_CHUNKS
var chunkSize = 1024; // Chunk size in bytes
#else
var chunkSize = 1024*1024; // Chunk size in bytes
#endif
if (!hasByteServing) chunkSize = datalength;
// Function to get a range from the remote URL.
var doXHR = (function(from, to) {
if (from > to) throw new Error("invalid range (" + from + ", " + to + ") or no bytes requested!");
if (to > datalength-1) throw new Error("only " + datalength + " bytes available! programmer error!");
// TODO: Use mozResponseArrayBuffer, responseStream, etc. if available.
var xhr = new XMLHttpRequest();
xhr.open('GET', url, false);
if (datalength !== chunkSize) xhr.setRequestHeader("Range", "bytes=" + from + "-" + to);
// Some hints to the browser that we want binary data.
if (typeof Uint8Array != 'undefined') xhr.responseType = 'arraybuffer';
if (xhr.overrideMimeType) {
xhr.overrideMimeType('text/plain; charset=x-user-defined');
}
xhr.send(null);
if (!(xhr.status >= 200 && xhr.status < 300 || xhr.status === 304)) throw new Error("Couldn't load " + url + ". Status: " + xhr.status);
if (xhr.response !== undefined) {
return new Uint8Array(xhr.response || []);
} else {
return intArrayFromString(xhr.responseText || '', true);
}
});
var lazyArray = new LazyUint8Array(chunkSize, datalength);
lazyArray.setDataGetter(function(chunkNum) {
var start = chunkNum * lazyArray.chunkSize;
var end = (chunkNum+1) * lazyArray.chunkSize - 1; // including this byte
end = Math.min(end, datalength-1); // if datalength-1 is selected, this is the last block
if (typeof(lazyArray.chunks[chunkNum]) === "undefined") {
lazyArray.chunks[chunkNum] = doXHR(start, end);
}
if (typeof(lazyArray.chunks[chunkNum]) === "undefined") throw new Error("doXHR failed!");
return lazyArray.chunks[chunkNum];
});
var properties = { isDevice: false, contents: lazyArray };
} else {
var properties = { isDevice: false, url: url };
}
return FS.createFile(parent, name, properties, canRead, canWrite);
},
// Preloads a file asynchronously. You can call this before run, for example in
// preRun. run will be delayed until this file arrives and is set up.
// If you call it after run(), you may want to pause the main loop until it
// completes, if so, you can use the onload parameter to be notified when
// that happens.
// In addition to normally creating the file, we also asynchronously preload
// the browser-friendly versions of it: For an image, we preload an Image
// element and for an audio, and Audio. These are necessary for SDL_Image
// and _Mixer to find the files in preloadedImages/Audios.
// You can also call this with a typed array instead of a url. It will then
// do preloading for the Image/Audio part, as if the typed array were the
// result of an XHR that you did manually.
createPreloadedFile: function(parent, name, url, canRead, canWrite, onload, onerror, dontCreateFile) {
Browser.ensureObjects();
var fullname = FS.joinPath([parent, name], true);
function processData(byteArray) {
function finish(byteArray) {
if (!dontCreateFile) {
FS.createDataFile(parent, name, byteArray, canRead, canWrite);
}
if (onload) onload();
removeRunDependency('cp ' + fullname);
}
var handled = false;
Module['preloadPlugins'].forEach(function(plugin) {
if (handled) return;
if (plugin['canHandle'](fullname)) {
plugin['handle'](byteArray, fullname, finish, function() {
if (onerror) onerror();
removeRunDependency('cp ' + fullname);
});
handled = true;
}
});
if (!handled) finish(byteArray);
}
addRunDependency('cp ' + fullname);
if (typeof url == 'string') {
Browser.asyncLoad(url, function(byteArray) {
processData(byteArray);
}, onerror);
} else {
processData(url);
}
},
// Creates a link to a sepcific local path.
createLink: function(parent, name, target, canRead, canWrite) {
var properties = {isDevice: false, link: target};
return FS.createFile(parent, name, properties, canRead, canWrite);
},
// Creates a character device with input and output callbacks:
// input: Takes no parameters, returns a byte value or null if no data is
// currently available.
// output: Takes a byte value; doesn't return anything. Can also be passed
// null to perform a flush of any cached data.
createDevice: function(parent, name, input, output) {
if (!(input || output)) {
throw new Error('A device must have at least one callback defined.');
}
var ops = {isDevice: true, input: input, output: output};
return FS.createFile(parent, name, ops, Boolean(input), Boolean(output));
},
// Makes sure a file's contents are loaded. Returns whether the file has
// been loaded successfully. No-op for files that have been loaded already.
forceLoadFile: function(obj) {
if (obj.isDevice || obj.isFolder || obj.link || obj.contents) return true;
var success = true;
if (typeof XMLHttpRequest !== 'undefined') {
throw new Error("Lazy loading should have been performed (contents set) in createLazyFile, but it was not. Lazy loading only works in web workers. Use --embed-file or --preload-file in emcc on the main thread.");
} else if (Module['read']) {
// Command-line.
try {
// WARNING: Can't read binary files in V8's d8 or tracemonkey's js, as
// read() will try to parse UTF8.
obj.contents = intArrayFromString(Module['read'](obj.url), true);
} catch (e) {
success = false;
}
} else {
throw new Error('Cannot load without read() or XMLHttpRequest.');
}
if (!success) ___setErrNo(ERRNO_CODES.EIO);
return success;
},
ensureRoot: function() {
if (FS.root) return;
// The main file system tree. All the contents are inside this.
FS.root = {
read: true,
write: true,
isFolder: true,
isDevice: false,
timestamp: Date.now(),
inodeNumber: 1,
contents: {}
};
},
// Initializes the filesystems with stdin/stdout/stderr devices, given
// optional handlers.
init: function(input, output, error) {
// Make sure we initialize only once.
assert(!FS.init.initialized, 'FS.init was previously called. If you want to initialize later with custom parameters, remove any earlier calls (note that one is automatically added to the generated code)');
FS.init.initialized = true;
FS.ensureRoot();
// Allow Module.stdin etc. to provide defaults, if none explicitly passed to us here
input = input || Module['stdin'];
output = output || Module['stdout'];
error = error || Module['stderr'];
// Default handlers.
var stdinOverridden = true, stdoutOverridden = true, stderrOverridden = true;
if (!input) {
stdinOverridden = false;
input = function() {
if (!input.cache || !input.cache.length) {
var result;
if (typeof window != 'undefined' &&
typeof window.prompt == 'function') {
// Browser.
result = window.prompt('Input: ');
if (result === null) result = String.fromCharCode(0); // cancel ==> EOF
} else if (typeof readline == 'function') {
// Command line.
result = readline();
}
if (!result) result = '';
input.cache = intArrayFromString(result + '\n', true);
}
return input.cache.shift();
};
}
var utf8 = new Runtime.UTF8Processor();
function simpleOutput(val) {
if (val === null || val === '\n'.charCodeAt(0)) {
output.printer(output.buffer.join(''));
output.buffer = [];
} else {
output.buffer.push(utf8.processCChar(val));
}
}
if (!output) {
stdoutOverridden = false;
output = simpleOutput;
}
if (!output.printer) output.printer = Module['print'];
if (!output.buffer) output.buffer = [];
if (!error) {
stderrOverridden = false;
error = simpleOutput;
}
if (!error.printer) error.printer = Module['print'];
if (!error.buffer) error.buffer = [];
// Create the temporary folder, if not already created
try {
FS.createFolder('/', 'tmp', true, true);
} catch(e) {}
// Create the I/O devices.
var devFolder = FS.createFolder('/', 'dev', true, true);
var stdin = FS.createDevice(devFolder, 'stdin', input);
var stdout = FS.createDevice(devFolder, 'stdout', null, output);
var stderr = FS.createDevice(devFolder, 'stderr', null, error);
FS.createDevice(devFolder, 'tty', input, output);
// Create default streams.
FS.streams[1] = {
path: '/dev/stdin',
object: stdin,
position: 0,
isRead: true,
isWrite: false,
isAppend: false,
isTerminal: !stdinOverridden,
error: false,
eof: false,
ungotten: []
};
FS.streams[2] = {
path: '/dev/stdout',
object: stdout,
position: 0,
isRead: false,
isWrite: true,
isAppend: false,
isTerminal: !stdoutOverridden,
error: false,
eof: false,
ungotten: []
};
FS.streams[3] = {
path: '/dev/stderr',
object: stderr,
position: 0,
isRead: false,
isWrite: true,
isAppend: false,
isTerminal: !stderrOverridden,
error: false,
eof: false,
ungotten: []
};
// Allocate these on the stack (and never free, we are called from ATINIT or earlier), to keep their locations low
_stdin = allocate([1], 'void*', ALLOC_STACK);
_stdout = allocate([2], 'void*', ALLOC_STACK);
_stderr = allocate([3], 'void*', ALLOC_STACK);
// Other system paths
FS.createPath('/', 'dev/shm/tmp', true, true); // temp files
// Newlib initialization
for (var i = FS.streams.length; i < Math.max(_stdin, _stdout, _stderr) + {{{ QUANTUM_SIZE }}}; i++) {
FS.streams[i] = null; // Make sure to keep FS.streams dense
}
FS.streams[_stdin] = FS.streams[1];
FS.streams[_stdout] = FS.streams[2];
FS.streams[_stderr] = FS.streams[3];
#if ASSERTIONS
FS.checkStreams();
assert(FS.streams.length < 1024); // at this early stage, we should not have a large set of file descriptors - just a few
#endif
__impure_ptr = allocate([ allocate(
{{{ Runtime.QUANTUM_SIZE === 4 ? '[0, 0, 0, 0, _stdin, 0, 0, 0, _stdout, 0, 0, 0, _stderr, 0, 0, 0]' : '[0, _stdin, _stdout, _stderr]' }}},
'void*', ALLOC_STATIC) ], 'void*', ALLOC_STATIC);
},
quit: function() {
if (!FS.init.initialized) return;
// Flush any partially-printed lines in stdout and stderr. Careful, they may have been closed
if (FS.streams[2] && FS.streams[2].object.output.buffer.length > 0) FS.streams[2].object.output('\n'.charCodeAt(0));
if (FS.streams[3] && FS.streams[3].object.output.buffer.length > 0) FS.streams[3].object.output('\n'.charCodeAt(0));
},
// Standardizes a path. Useful for making comparisons of pathnames work in a consistent manner.
// For example, ./file and file are really the same, so this function will remove ./
standardizePath: function(path) {
if (path.substr(0, 2) == './') path = path.substr(2);
return path;
},
deleteFile: function(path) {
path = FS.analyzePath(path);
if (!path.parentExists || !path.exists) {
throw 'Invalid path ' + path;
}
delete path.parentObject.contents[path.name];
}
},
// ==========================================================================
// dirent.h
// ==========================================================================
__dirent_struct_layout: Runtime.generateStructInfo(['d_ino', 'd_name', 'd_off', 'd_reclen', 'd_type'], '%struct.dirent'),
opendir__deps: ['$FS', '__setErrNo', '$ERRNO_CODES', '__dirent_struct_layout'],
opendir: function(dirname) {
// DIR *opendir(const char *dirname);
// http://pubs.opengroup.org/onlinepubs/007908799/xsh/opendir.html
// NOTE: Calculating absolute path redundantly since we need to associate it
// with the opened stream.
var path = FS.absolutePath(Pointer_stringify(dirname));
if (path === null) {
___setErrNo(ERRNO_CODES.ENOENT);
return 0;
}
var target = FS.findObject(path);
if (target === null) return 0;
if (!target.isFolder) {
___setErrNo(ERRNO_CODES.ENOTDIR);
return 0;
} else if (!target.read) {
___setErrNo(ERRNO_CODES.EACCES);
return 0;
}
var id = FS.streams.length; // Keep dense
var contents = [];
for (var key in target.contents) contents.push(key);
FS.streams[id] = {
path: path,
object: target,
// An index into contents. Special values: -2 is ".", -1 is "..".
position: -2,
isRead: true,
isWrite: false,
isAppend: false,
error: false,
eof: false,
ungotten: [],
// Folder-specific properties:
// Remember the contents at the time of opening in an array, so we can
// seek between them relying on a single order.
contents: contents,
// Each stream has its own area for readdir() returns.
currentEntry: _malloc(___dirent_struct_layout.__size__)
};
#if ASSERTIONS
FS.checkStreams();
#endif
return id;
},
closedir__deps: ['$FS', '__setErrNo', '$ERRNO_CODES'],
closedir: function(dirp) {
// int closedir(DIR *dirp);
// http://pubs.opengroup.org/onlinepubs/007908799/xsh/closedir.html
if (!FS.streams[dirp] || !FS.streams[dirp].object.isFolder) {
return ___setErrNo(ERRNO_CODES.EBADF);
} else {
_free(FS.streams[dirp].currentEntry);
FS.streams[dirp] = null;
return 0;
}
},
telldir__deps: ['$FS', '__setErrNo', '$ERRNO_CODES'],
telldir: function(dirp) {
// long int telldir(DIR *dirp);
// http://pubs.opengroup.org/onlinepubs/007908799/xsh/telldir.html
if (!FS.streams[dirp] || !FS.streams[dirp].object.isFolder) {
return ___setErrNo(ERRNO_CODES.EBADF);
} else {
return FS.streams[dirp].position;
}
},
seekdir__deps: ['$FS', '__setErrNo', '$ERRNO_CODES'],
seekdir: function(dirp, loc) {
// void seekdir(DIR *dirp, long int loc);
// http://pubs.opengroup.org/onlinepubs/007908799/xsh/seekdir.html
if (!FS.streams[dirp] || !FS.streams[dirp].object.isFolder) {
___setErrNo(ERRNO_CODES.EBADF);
} else {
var entries = 0;
for (var key in FS.streams[dirp].contents) entries++;
if (loc >= entries) {
___setErrNo(ERRNO_CODES.EINVAL);
} else {
FS.streams[dirp].position = loc;
}
}
},
rewinddir__deps: ['seekdir'],
rewinddir: function(dirp) {
// void rewinddir(DIR *dirp);
// http://pubs.opengroup.org/onlinepubs/007908799/xsh/rewinddir.html
_seekdir(dirp, -2);
},
readdir_r__deps: ['$FS', '__setErrNo', '$ERRNO_CODES', '__dirent_struct_layout'],
readdir_r: function(dirp, entry, result) {
// int readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result);
// http://pubs.opengroup.org/onlinepubs/007908799/xsh/readdir_r.html
if (!FS.streams[dirp] || !FS.streams[dirp].object.isFolder) {
return ___setErrNo(ERRNO_CODES.EBADF);
}
var stream = FS.streams[dirp];
var loc = stream.position;
var entries = 0;
for (var key in stream.contents) entries++;
if (loc < -2 || loc >= entries) {
{{{ makeSetValue('result', '0', '0', 'i8*') }}}
} else {
var name, inode, type;
if (loc === -2) {
name = '.';
inode = 1; // Really undefined.
type = 4; //DT_DIR
} else if (loc === -1) {
name = '..';
inode = 1; // Really undefined.
type = 4; //DT_DIR
} else {
var object;
name = stream.contents[loc];
object = stream.object.contents[name];
inode = object.inodeNumber;
type = object.isDevice ? 2 // DT_CHR, character device.
: object.isFolder ? 4 // DT_DIR, directory.
: object.link !== undefined ? 10 // DT_LNK, symbolic link.
: 8; // DT_REG, regular file.
}
stream.position++;
var offsets = ___dirent_struct_layout;
{{{ makeSetValue('entry', 'offsets.d_ino', 'inode', 'i32') }}}
{{{ makeSetValue('entry', 'offsets.d_off', 'stream.position', 'i32') }}}
{{{ makeSetValue('entry', 'offsets.d_reclen', 'name.length + 1', 'i32') }}}
for (var i = 0; i < name.length; i++) {
{{{ makeSetValue('entry + offsets.d_name', 'i', 'name.charCodeAt(i)', 'i8') }}}
}
{{{ makeSetValue('entry + offsets.d_name', 'i', '0', 'i8') }}}
{{{ makeSetValue('entry', 'offsets.d_type', 'type', 'i8') }}}
{{{ makeSetValue('result', '0', 'entry', 'i8*') }}}
}
return 0;
},
readdir__deps: ['readdir_r', '__setErrNo', '$ERRNO_CODES'],
readdir: function(dirp) {
// struct dirent *readdir(DIR *dirp);
// http://pubs.opengroup.org/onlinepubs/007908799/xsh/readdir_r.html
if (!FS.streams[dirp] || !FS.streams[dirp].object.isFolder) {
___setErrNo(ERRNO_CODES.EBADF);
return 0;
} else {
if (!_readdir.result) _readdir.result = _malloc(4);
_readdir_r(dirp, FS.streams[dirp].currentEntry, _readdir.result);
if ({{{ makeGetValue(0, '_readdir.result', 'i8*') }}} === 0) {
return 0;
} else {
return FS.streams[dirp].currentEntry;
}
}
},
__01readdir64_: 'readdir',
// TODO: Check if we need to link any other aliases.
// ==========================================================================
// utime.h
// ==========================================================================
__utimbuf_struct_layout: Runtime.generateStructInfo(['actime', 'modtime'], '%struct.utimbuf'),
utime__deps: ['$FS', '__setErrNo', '$ERRNO_CODES', '__utimbuf_struct_layout'],
utime: function(path, times) {
// int utime(const char *path, const struct utimbuf *times);
// http://pubs.opengroup.org/onlinepubs/009695399/basedefs/utime.h.html
var time;
if (times) {
// NOTE: We don't keep track of access timestamps.
var offset = ___utimbuf_struct_layout.modtime;
time = {{{ makeGetValue('times', 'offset', 'i32') }}}
time *= 1000;
} else {
time = Date.now();
}
var file = FS.findObject(Pointer_stringify(path));
if (file === null) return -1;
if (!file.write) {
___setErrNo(ERRNO_CODES.EPERM);
return -1;
}
file.timestamp = time;
return 0;
},
// ==========================================================================
// libgen.h
// ==========================================================================
__libgenSplitName: function(path) {
if (path === 0 || {{{ makeGetValue('path', 0, 'i8') }}} === 0) {
// Null or empty results in '.'.
var me = ___libgenSplitName;
if (!me.ret) {
me.ret = allocate(['.'.charCodeAt(0), 0], 'i8', ALLOC_NORMAL);
}
return [me.ret, -1];
} else {
var slash = '/'.charCodeAt(0);
var allSlashes = true;
var slashPositions = [];
for (var i = 0; {{{ makeGetValue('path', 'i', 'i8') }}} !== 0; i++) {
if ({{{ makeGetValue('path', 'i', 'i8') }}} === slash) {
slashPositions.push(i);
} else {
allSlashes = false;
}
}
var length = i;
if (allSlashes) {
// All slashes result in a single slash.
{{{ makeSetValue('path', '1', '0', 'i8') }}}
return [path, -1];
} else {
// Strip trailing slashes.
while (slashPositions.length &&
slashPositions[slashPositions.length - 1] == length - 1) {
{{{ makeSetValue('path', 'slashPositions.pop(i)', '0', 'i8') }}}
length--;
}
return [path, slashPositions.pop()];
}
}
},
basename__deps: ['__libgenSplitName'],
basename: function(path) {
// char *basename(char *path);
// http://pubs.opengroup.org/onlinepubs/007908799/xsh/basename.html
var result = ___libgenSplitName(path);
return result[0] + result[1] + 1;
},
__xpg_basename: 'basename',
dirname__deps: ['__libgenSplitName'],
dirname: function(path) {
// char *dirname(char *path);
// http://pubs.opengroup.org/onlinepubs/007908799/xsh/dirname.html
var result = ___libgenSplitName(path);
if (result[1] == 0) {
{{{ makeSetValue('result[0]', 1, '0', 'i8') }}}
} else if (result[1] !== -1) {
{{{ makeSetValue('result[0]', 'result[1]', '0', 'i8') }}}
}
return result[0];
},
// ==========================================================================
// sys/stat.h
// ==========================================================================
__stat_struct_layout: Runtime.generateStructInfo([
'st_dev',
'st_ino',
'st_mode',
'st_nlink',
'st_uid',
'st_gid',
'st_rdev',
'st_size',
'st_atime',
'st_spare1',
'st_mtime',
'st_spare2',
'st_ctime',
'st_spare3',
'st_blksize',
'st_blocks',
'st_spare4'], '%struct.stat'),
stat__deps: ['$FS', '__stat_struct_layout'],
stat: function(path, buf, dontResolveLastLink) {
// http://pubs.opengroup.org/onlinepubs/7908799/xsh/stat.html
// int stat(const char *path, struct stat *buf);
// NOTE: dontResolveLastLink is a shortcut for lstat(). It should never be
// used in client code.
var obj = FS.findObject(Pointer_stringify(path), dontResolveLastLink);
if (obj === null || !FS.forceLoadFile(obj)) return -1;
var offsets = ___stat_struct_layout;
// Constants.
{{{ makeSetValue('buf', 'offsets.st_nlink', '1', 'i32') }}}
{{{ makeSetValue('buf', 'offsets.st_uid', '0', 'i32') }}}
{{{ makeSetValue('buf', 'offsets.st_gid', '0', 'i32') }}}
{{{ makeSetValue('buf', 'offsets.st_blksize', '4096', 'i32') }}}
// Variables.
{{{ makeSetValue('buf', 'offsets.st_ino', 'obj.inodeNumber', 'i32') }}}
var time = Math.floor(obj.timestamp / 1000);
if (offsets.st_atime === undefined) {
offsets.st_atime = offsets.st_atim.tv_sec;
offsets.st_mtime = offsets.st_mtim.tv_sec;
offsets.st_ctime = offsets.st_ctim.tv_sec;
var nanosec = (obj.timestamp % 1000) * 1000;
{{{ makeSetValue('buf', 'offsets.st_atim.tv_nsec', 'nanosec', 'i32') }}}
{{{ makeSetValue('buf', 'offsets.st_mtim.tv_nsec', 'nanosec', 'i32') }}}
{{{ makeSetValue('buf', 'offsets.st_ctim.tv_nsec', 'nanosec', 'i32') }}}
}
{{{ makeSetValue('buf', 'offsets.st_atime', 'time', 'i32') }}}
{{{ makeSetValue('buf', 'offsets.st_mtime', 'time', 'i32') }}}
{{{ makeSetValue('buf', 'offsets.st_ctime', 'time', 'i32') }}}
var mode = 0;
var size = 0;
var blocks = 0;
var dev = 0;
var rdev = 0;
if (obj.isDevice) {
// Device numbers reuse inode numbers.
dev = rdev = obj.inodeNumber;
size = blocks = 0;
mode = 0x2000; // S_IFCHR.
} else {
dev = 1;
rdev = 0;
// NOTE: In our implementation, st_blocks = Math.ceil(st_size/st_blksize),
// but this is not required by the standard.
if (obj.isFolder) {
size = 4096;
blocks = 1;
mode = 0x4000; // S_IFDIR.
} else {
var data = obj.contents || obj.link;
size = data.length;
blocks = Math.ceil(data.length / 4096);
mode = obj.link === undefined ? 0x8000 : 0xA000; // S_IFREG, S_IFLNK.
}
}
{{{ makeSetValue('buf', 'offsets.st_dev', 'dev', 'i32') }}};
{{{ makeSetValue('buf', 'offsets.st_rdev', 'rdev', 'i32') }}};
{{{ makeSetValue('buf', 'offsets.st_size', 'size', 'i32') }}}
{{{ makeSetValue('buf', 'offsets.st_blocks', 'blocks', 'i32') }}}
if (obj.read) mode |= 0x16D; // S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH.
if (obj.write) mode |= 0x92; // S_IWUSR | S_IWGRP | S_IWOTH.
{{{ makeSetValue('buf', 'offsets.st_mode', 'mode', 'i32') }}}
return 0;
},
lstat__deps: ['stat'],
lstat: function(path, buf) {
// int lstat(const char *path, struct stat *buf);
// http://pubs.opengroup.org/onlinepubs/7908799/xsh/lstat.html
return _stat(path, buf, true);
},
fstat__deps: ['$FS', '__setErrNo', '$ERRNO_CODES', 'stat'],
fstat: function(fildes, buf) {
// int fstat(int fildes, struct stat *buf);
// http://pubs.opengroup.org/onlinepubs/7908799/xsh/fstat.html
if (!FS.streams[fildes]) {
___setErrNo(ERRNO_CODES.EBADF);
return -1;
} else {
var pathArray = intArrayFromString(FS.streams[fildes].path);
return _stat(allocate(pathArray, 'i8', ALLOC_STACK), buf);
}
},
mknod__deps: ['$FS', '__setErrNo', '$ERRNO_CODES'],
mknod: function(path, mode, dev) {
// int mknod(const char *path, mode_t mode, dev_t dev);
// http://pubs.opengroup.org/onlinepubs/7908799/xsh/mknod.html
if (dev !== 0 || !(mode & 0xC000)) { // S_IFREG | S_IFDIR.
// Can't create devices or pipes through mknod().
___setErrNo(ERRNO_CODES.EINVAL);
return -1;
} else {
var properties = {contents: [], isFolder: Boolean(mode & 0x4000)}; // S_IFDIR.
path = FS.analyzePath(Pointer_stringify(path));
try {
FS.createObject(path.parentObject, path.name, properties,
mode & 0x100, mode & 0x80); // S_IRUSR, S_IWUSR.
return 0;
} catch (e) {
return -1;
}
}
},
mkdir__deps: ['mknod'],