From deb15fcf740342d0dab09db6e48b6d81929a22d5 Mon Sep 17 00:00:00 2001
From: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Date: Mon, 4 Jan 2016 12:06:32 +0530
Subject: [PATCH] fs: deprecate fs.read's string interface

`fs.read` supports a deprecated string interface version, which is
not documented. It was intended to be deprecated in this commit in 2010
https://github.com/nodejs/node/commit/c93e0aaf062081db3ec40ac45b3e2c979d5759d6
This patch issues a deprecation message saying the usage of this
interface is deprecated.
---
 lib/fs.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/lib/fs.js b/lib/fs.js
index af8001bb181698..be83104e618f7b 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -35,6 +35,7 @@ const isWindows = process.platform === 'win32';
 
 const DEBUG = process.env.NODE_DEBUG && /fs/.test(process.env.NODE_DEBUG);
 const errnoException = util._errnoException;
+const printDeprecation = require('internal/util').printDeprecationMessage;
 
 function throwOptionsError(options) {
   throw new TypeError('Expected options to be either an object or a string, ' +
@@ -584,9 +585,14 @@ fs.openSync = function(path, flags, mode) {
   return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
 };
 
+var readWarned = false;
 fs.read = function(fd, buffer, offset, length, position, callback) {
   if (!(buffer instanceof Buffer)) {
     // legacy string interface (fd, length, position, encoding, callback)
+    readWarned = printDeprecation('fs.read\'s legacy String interface ' +
+                                  'is deprecated. Use the Buffer API as ' +
+                                  'mentioned in the documentation instead.',
+                                  readWarned);
     const cb = arguments[4];
     const encoding = arguments[3];
 
@@ -636,12 +642,17 @@ function tryToStringWithEnd(buf, encoding, end, callback) {
   callback(e, buf, end);
 }
 
+var readSyncWarned = false;
 fs.readSync = function(fd, buffer, offset, length, position) {
   var legacy = false;
   var encoding;
 
   if (!(buffer instanceof Buffer)) {
     // legacy string interface (fd, length, position, encoding, callback)
+    readSyncWarned = printDeprecation('fs.readSync\'s legacy String interface' +
+                                      'is deprecated. Use the Buffer API as ' +
+                                      'mentioned in the documentation instead.',
+                                      readSyncWarned);
     legacy = true;
     encoding = arguments[3];