From 79d477ac3a19b906895ed4aaa0bfbd739ada01dc Mon Sep 17 00:00:00 2001
From: Carson McManus <carson.mcmanus1@gmail.com>
Date: Sun, 25 Jun 2017 21:38:22 -0400
Subject: [PATCH] fix #18, ReadLineSecure causes ArgumentOutOfRangeException in
 setup

---
 Utils.cs | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/Utils.cs b/Utils.cs
index a512dd3..7c636e8 100644
--- a/Utils.cs
+++ b/Utils.cs
@@ -12,9 +12,16 @@ namespace SteamGuard
 			do
 			{
 				key = Console.ReadKey(true);
-				if ((int)key.Key >= 65 && (int)key.Key <= 90)
+				if (((int)key.Key) >= 65 && ((int)key.Key <= 90))
 				{
-					text.Insert(cursorIndex, key.KeyChar.ToString());
+					if (cursorIndex == 0 || cursorIndex == text.Length - 1)
+					{
+						text += key.KeyChar.ToString();
+					}
+					else
+					{
+						text.Insert(cursorIndex, key.KeyChar.ToString());
+					}
 					cursorIndex++;
 				}
 				else if (key.Key == ConsoleKey.Backspace && cursorIndex > 0)
@@ -35,10 +42,17 @@ namespace SteamGuard
 				{
 					cursorIndex = 0;
 				}
-				else if (cursorIndex > text.Length)
+				else if (text.Length == 0 && cursorIndex > text.Length)
+				{
+					cursorIndex = 0;
+				}
+				else if (text.Length != 0 && cursorIndex >= text.Length)
 				{
 					cursorIndex = text.Length - 1;
 				}
+
+				// For debugging:
+				// Console.Title = string.Format("{0}/{1} - {2} ({3}) - {4}", cursorIndex, text.Length, key.Key.ToString(), (int)key.Key, text);
 			} while (key.Key != ConsoleKey.Enter);
 			return text;
 		}