Add: setBufferSize

README.md

@@ -37,7 +37,7 @@ answer = readlineSync.question([query[, options]])
 Displays the `query` to the user, and then returns the user's response after it has been typed.  
 You can specify `options`. (see [Options](#options))
 
-The `query` may be string, or may not be (e.g. number, Date, Object, etc.). This is converted to string (i.e. `toString` method is called) before it is displayed every time.
+The `query` may be string, or may not be (e.g. number, Date, Object, etc.). This is converted to string (i.e. `toString` method is called) before it is displayed.
 
 ### prompt
 
@@ -127,7 +127,7 @@ console.log('Login ...');
 
 The typed text is not shown on screen.
 
-```shell
+```
 PASSWORD :
 Login ...
 ```

lib/readline-sync.js

@@ -9,7 +9,6 @@
 'use strict';
 
 var
-  BUF_SIZE = 256,
   IS_WIN = process.platform === 'win32',
   SHELL_PATH = IS_WIN ? 'cmd.exe' : '/bin/sh',
 
@@ -20,14 +19,15 @@ var
   childProc = require('child_process'),
   stdin = process.stdin,
   stdout = process.stdout,
-  buffer = new Buffer(BUF_SIZE),
 
   promptText = '> ',
   encoding = 'utf8',
+  bufSize = 256,
   useShell = true, print, tempdir, salt = 0;
 
 function _readlineSync(display, options) {
-  var input = '', rsize, err;
+  var input = '', buffer = new Buffer(bufSize),
+    rsize, err;
 
   if (display !== '') { // null and undefined were excluded.
     if (typeof print === 'function') { print(display, encoding); }
@@ -49,7 +49,7 @@ function _readlineSync(display, options) {
       rsize = 0;
 
       try {
-        rsize = fs.readSync(stdin.fd, buffer, 0, BUF_SIZE);
+        rsize = fs.readSync(stdin.fd, buffer, 0, bufSize);
       } catch (e) {
         if (e.code === 'EOF') { break; } // pipe
 
@@ -197,6 +197,13 @@ exports.setEncoding = function(newEncoding) {
   return encoding;
 };
 
+exports.setBufferSize = function(newBufSize) {
+  if (typeof newBufSize === 'number') {
+    bufSize = newBufSize;
+  }
+  return bufSize;
+};
+
 exports.prompt = function(options) {
   return _readlineSync(promptText, options);
 };