From 6cbbfef994930bc47581d592124e82b58e55ac7b Mon Sep 17 00:00:00 2001
From: Evan Lucas <evanlucas@me.com>
Date: Tue, 26 Jan 2016 08:12:41 -0600
Subject: net: move isLegalPort to internal/net

isLegalPort can be used in more places than just net.js. This change
moves it to a new internal net module in preparation for using it in
the dns module.

PR-URL: https://github.com/nodejs/node/pull/4882
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
---
 lib/internal/net.js | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 lib/internal/net.js

(limited to 'lib/internal/net.js')

diff --git a/lib/internal/net.js b/lib/internal/net.js
new file mode 100644
index 0000000000..effc6485d2
--- /dev/null
+++ b/lib/internal/net.js
@@ -0,0 +1,11 @@
+'use strict';
+
+module.exports = { isLegalPort };
+
+// Check that the port number is not NaN when coerced to a number,
+// is an integer and that it falls within the legal range of port numbers.
+function isLegalPort(port) {
+  if (typeof port === 'string' && port.trim() === '')
+    return false;
+  return +port === (port >>> 0) && port >= 0 && port <= 0xFFFF;
+}
-- 
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