From 5eddc078e95d2f217c303025e4e5516b45374fa0 Mon Sep 17 00:00:00 2001
From: moitoius_cp <7bd20ad30720b36bd251fb928c419f8754d57bfcCkJyHhZD>
Date: Wed, 2 Jan 2008 18:48:00 +0000
Subject: [PATCH] Backspace now supported.

---
 source/Cosmos/Cosmos.Kernel.Plugs/Console.cs  | 23 ++++++++++++++-
 .../Cosmos/Cosmos.Kernel/FileSystem/Fat16.cs  | 29 ++++++++++++++++++-
 source/Cosmos/Cosmos.Kernel/Keyboard.cs       |  2 ++
 3 files changed, 52 insertions(+), 2 deletions(-)

diff --git a/source/Cosmos/Cosmos.Kernel.Plugs/Console.cs b/source/Cosmos/Cosmos.Kernel.Plugs/Console.cs
index 4d7a9b3a1..a6b85f302 100644
--- a/source/Cosmos/Cosmos.Kernel.Plugs/Console.cs
+++ b/source/Cosmos/Cosmos.Kernel.Plugs/Console.cs
@@ -32,6 +32,16 @@ namespace Cosmos.Kernel.Plugs {
             TextScreen.SetColors(_foreground, _background);
         }
 
+        public static int get_CursorLeft()
+        {
+            return TextScreen.CurrentChar;
+        }
+
+        public static void set_CursorLeft(int x)
+        {
+            TextScreen.CurrentChar = x;
+        }
+
 		//TODO: Console uses TextWriter - intercept and plug it instead
 		public static void Clear() {
 			TextScreen.Clear();
@@ -67,7 +77,7 @@ namespace Cosmos.Kernel.Plugs {
 		}
 
 		public static string ReadLine() {
-			List<char> chars = new List<char>(32);
+			List<char> chars = new List<char>();
 			char current;
 			// HACK: convert this to "while ((current = Keyboard.ReadChar()) != '\n') {" 
 			//   MTW: SOmehow an invalid opcode exception is occurring.
@@ -76,6 +86,17 @@ namespace Cosmos.Kernel.Plugs {
 				if (current == '\n') {
 					break;
 				}
+                if (current == '\u0968') // Backspace
+                {
+                    if (chars.Count != 0)
+                    {
+                        chars.RemoveAt(chars.Count);
+                        TextScreen.CurrentChar--;
+                        TextScreen.WriteChar(' ');
+                        TextScreen.CurrentChar--;
+                    }
+                    continue;
+                }
 				chars.Add(current);
 				Write(current);
 			}
diff --git a/source/Cosmos/Cosmos.Kernel/FileSystem/Fat16.cs b/source/Cosmos/Cosmos.Kernel/FileSystem/Fat16.cs
index fae0e5091..fccd9b2da 100644
--- a/source/Cosmos/Cosmos.Kernel/FileSystem/Fat16.cs
+++ b/source/Cosmos/Cosmos.Kernel/FileSystem/Fat16.cs
@@ -39,6 +39,14 @@ namespace Cosmos.Kernel.FileSystem
             // TODO: FAT32
             #endregion
 
+            #region Util
+            public uint _rootDirSectors;
+            public uint _realFatSize;
+            public uint _firstDataSector;
+            public uint _realTotalSectors;
+            public uint _dataSectors;
+            #endregion
+
             /// <summary>
             /// Reads the header from a byte source.
             /// </summary>
@@ -75,6 +83,22 @@ namespace Cosmos.Kernel.FileSystem
 
                 #region FAT 32
                 #endregion
+
+                #region Util
+                /*_rootDirSectors = ((_rootEntryCount * 32) + (_bytesPerSector - 1)) / _bytesPerSector;
+                _fatSize = _fatSize;
+                _firstDataSector = _reservedSectorCount + (_allocationTables * _realFatSize) + _rootDirSectors;
+                if (_totalSectors == 0)
+                    _realTotalSectors = _totalSectors32;
+                else
+                    _realTotalSectors = _totalSectors;
+                _dataSectors = _realTotalSectors - (_reservedSectorCount + (_allocationTables * _realFatSize) + _rootDirSectors);*/
+                #endregion
+            }
+
+            public uint FirstSectorOfCluster(uint cluster)
+            {
+                return ((cluster - 2) * _sectorPerCluster) + _firstDataSector;
             }
 
             private ushort ReadShort(byte[] source, int pos, ushort mask)
@@ -120,6 +144,7 @@ namespace Cosmos.Kernel.FileSystem
         }
 
         private ATA _ata;
+        private Header _header;
 
         public Fat16(ATA ata)
         {
@@ -131,7 +156,9 @@ namespace Cosmos.Kernel.FileSystem
 
         public override void Open()
         {
-
+            _header = new Header();
+            
+            // TODO: Read the header.
         }
 
         public override void Dispose()
diff --git a/source/Cosmos/Cosmos.Kernel/Keyboard.cs b/source/Cosmos/Cosmos.Kernel/Keyboard.cs
index f914c6ce6..29db83a56 100644
--- a/source/Cosmos/Cosmos.Kernel/Keyboard.cs
+++ b/source/Cosmos/Cosmos.Kernel/Keyboard.cs
@@ -126,6 +126,8 @@ namespace Cosmos.Kernel {
 			AddKey(0x1C0000, '\n');
 			AddKey(0x39, ' ');
 			AddKey(0x390000, ' ');
+            AddKey(0x0E, '\u0968');
+            AddKey(0x0E0000, '\u0968');
 			#endregion
 
 			#region Punctuation