Support octal strings for modes

This allows the various fs utilities and process.umask to be used in
ECMAScript 5 Strict Mode, where the octal literal format is verboten,
without requiring users to litter their code with a bunch of parseInt
calls.

lib/fs.js

@@ -171,8 +171,21 @@ fs.closeSync = function(fd) {
   return binding.close(fd);
 };
 
-fs.open = function(path, flags, mode_, callback) {
-  var mode = (typeof(mode_) == 'number' ? mode_ : 0666);
+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) {
+  mode = modeNum(mode, '0666');
   var callback_ = arguments[arguments.length - 1];
   var callback = (typeof(callback_) == 'function' ? callback_ : null);
 
@@ -180,7 +193,7 @@ fs.open = function(path, flags, mode_, callback) {
 };
 
 fs.openSync = function(path, flags, mode) {
-  if (mode === undefined) { mode = 0666; }
+  mode = modeNum(mode, '0666');
   return binding.open(path, stringToFlags(flags), mode);
 };
 
@@ -306,11 +319,11 @@ fs.fsyncSync = function(fd) {
 };
 
 fs.mkdir = function(path, mode, callback) {
-  binding.mkdir(path, mode, callback || noop);
+  binding.mkdir(path, modeNum(mode), callback || noop);
 };
 
 fs.mkdirSync = function(path, mode) {
-  return binding.mkdir(path, mode);
+  return binding.mkdir(path, modeNum(mode));
 };
 
 fs.sendfile = function(outFd, inFd, inOffset, length, callback) {
@@ -386,11 +399,11 @@ fs.unlinkSync = function(path) {
 };
 
 fs.chmod = function(path, mode, callback) {
-  binding.chmod(path, mode, callback || noop);
+  binding.chmod(path, modeNum(mode), callback || noop);
 };
 
 fs.chmodSync = function(path, mode) {
-  return binding.chmod(path, mode);
+  return binding.chmod(path, modeNum(mode));
 };
 
 fs.chown = function(path, uid, gid, callback) {
@@ -684,7 +697,7 @@ var ReadStream = fs.ReadStream = function(path, options) {
   this.paused = false;
 
   this.flags = 'r';
-  this.mode = 0666;
+  this.mode = parseInt('0666', 8);
   this.bufferSize = 64 * 1024;
 
   options = options || {};
@@ -871,7 +884,7 @@ var WriteStream = fs.WriteStream = function(path, options) {
 
   this.flags = 'w';
   this.encoding = 'binary';
-  this.mode = 0666;
+  this.mode = parseInt('0666', 8);
 
   options = options || {};
 

src/node.cc

@@ -1329,17 +1329,37 @@ static Handle<Value> Cwd(const Arguments& args) {
 static Handle<Value> Umask(const Arguments& args){
   HandleScope scope;
   unsigned int old;
-  if(args.Length() < 1) {
+
+  if(args.Length() < 1 || args[0]->IsUndefined()) {
     old = umask(0);
     umask((mode_t)old);
-  }
-  else if(!args[0]->IsInt32()) {
+
+  } else if(!args[0]->IsInt32() && !args[0]->IsString()) {
+    return ThrowException(Exception::TypeError(
+          String::New("argument must be an integer or octal string.")));
+
+  } else {
+    int oct;
+    if(args[0]->IsInt32()) {
+      oct = args[0]->Uint32Value();
+    } else {
+      oct = 0;
+      String::Utf8Value str(args[0]);
+
+      // Parse the octal string.
+      for (int i = 0; i < str.length(); i++) {
+        char c = (*str)[i];
+        if (c > '7' || c < '0') {
           return ThrowException(Exception::TypeError(
-          String::New("argument must be an integer.")));
+                String::New("invalid octal string")));
         }
-  else {
-    old = umask((mode_t)args[0]->Uint32Value());
+        oct *= 8;
+        oct += c - '0';
       }
+    }
+    old = umask(static_cast<mode_t>(oct));
+  }
+
   return scope.Close(Uint32::New(old));
 }
 

test/simple/test-fs-chmod.js

@@ -7,7 +7,7 @@ var success_count = 0;
 
 var file = path.join(common.fixturesDir, 'a.js');
 
-fs.chmod(file, 0777, function(err) {
+fs.chmod(file, '0777', function(err) {
   if (err) {
     got_error = true;
   } else {

test/simple/test-umask.js

@@ -1,10 +1,10 @@
 var common = require('../common');
 var assert = require('assert');
 
-var mask = 0664;
+var mask = '0664';
 var old = process.umask(mask);
 
-assert.equal(mask, process.umask(old));
+assert.equal(parseInt(mask, 8), process.umask(old));
 
 // confirm reading the umask does not modify it.
 // 1. If the test fails, this call will succeed, but the mask will be set to 0