From 45ea05112879353e05848dde97fff36615721d6b Mon Sep 17 00:00:00 2001
From: John Hodge <tpg@mutabah.net>
Date: Sat, 14 Sep 2013 09:47:19 +0800
Subject: [PATCH] Kernel/VTerm - Switched to using userland VT100 code

---
 KernelLand/Kernel/drv/vterm.h             |   1 +
 KernelLand/Kernel/drv/vterm_font.c        |  12 +
 KernelLand/Kernel/drv/vterm_termbuf.c     |  62 +--
 KernelLand/Kernel/drv/vterm_vt100.c       | 520 +++++++---------------
 KernelLand/Kernel/include/api_drv_video.h |   4 +
 5 files changed, 224 insertions(+), 375 deletions(-)

diff --git a/KernelLand/Kernel/drv/vterm.h b/KernelLand/Kernel/drv/vterm.h
index 5acb4640..85264263 100644
--- a/KernelLand/Kernel/drv/vterm.h
+++ b/KernelLand/Kernel/drv/vterm.h
@@ -119,6 +119,7 @@ extern void	VT_int_ParseEscape_StandardLarge(tVTerm *Term, char CmdChar, int arg
 extern int	VT_int_ParseEscape(tVTerm *Term, const char *Buffer, size_t Bytes);
 // --- Terminal Buffer ---
 extern void	VT_int_PutString(tVTerm *Term, const Uint8 *Buffer, Uint Count);
+extern void	VT_int_PutRawString(tVTerm *Term, const Uint8 *String, size_t Bytes);
 extern void	VT_int_PutChar(tVTerm *Term, Uint32 Ch);
 extern void	VT_int_ScrollText(tVTerm *Term, int Count);
 extern void	VT_int_ClearLine(tVTerm *Term, int Num);
diff --git a/KernelLand/Kernel/drv/vterm_font.c b/KernelLand/Kernel/drv/vterm_font.c
index f084c5b3..cb2702d9 100644
--- a/KernelLand/Kernel/drv/vterm_font.c
+++ b/KernelLand/Kernel/drv/vterm_font.c
@@ -132,6 +132,18 @@ void VT_Font_Render(Uint32 Codepoint, void *Buffer, int Depth, int Pitch, Uint32
 	}
 }
 
+Uint16 VT_Colour24to12(Uint32 Col24)
+{
+	Uint16	ret = 0;
+	
+	for( int i = 0; i < 3; i ++ )
+	{
+		Uint32	comp = (Col24 >> (i*8)) & 0xFF;
+		ret |= ((comp * 15) / 255) << (i*4);
+	}
+	return ret;
+}
+
 /**
  * \fn Uint32 VT_Colour12to24(Uint16 Col12)
  * \brief Converts a 12-bit colour into 24 bits
diff --git a/KernelLand/Kernel/drv/vterm_termbuf.c b/KernelLand/Kernel/drv/vterm_termbuf.c
index ee543858..e3ddff1f 100644
--- a/KernelLand/Kernel/drv/vterm_termbuf.c
+++ b/KernelLand/Kernel/drv/vterm_termbuf.c
@@ -5,8 +5,11 @@
  * drv/vterm_termbuf.c
  * - Virtual Terminal - Terminal buffer manipulation
  */
+#define DEBUG	1
 #include "vterm.h"
 
+extern int	Term_HandleVT100(tVTerm *Term, int Len, const char *Buf);
+
 // === CODE ===
 
 /**
@@ -15,30 +18,32 @@
  */
 void VT_int_PutString(tVTerm *Term, const Uint8 *Buffer, Uint Count)
 {
-	 int	i;
-	
 	// Iterate
-	for( i = 0; i < Count; i++ )
+	for( int ofs = 0; ofs < Count; )
 	{
-		// Handle escape sequences
-		int ret = VT_int_ParseEscape(Term, (const char*)&Buffer[i], Count-i);
-		if( ret > 0 )
-		{
-			i += ret-1;
-			continue;
+		int esc_len = Term_HandleVT100(Term, Count - ofs, (const void*)(Buffer + ofs));
+		if( esc_len < 0 ) {
+			esc_len = -esc_len;
+			VT_int_PutRawString(Term, Buffer + ofs, esc_len);
+			//Debug("Raw string '%.*s'", esc_len, Buffer+ofs);
 		}
-		
-		// Fast check for non UTF-8
-		if( Buffer[i] < 128 )	// Plain ASCII
-			VT_int_PutChar(Term, Buffer[i]);
-		else {	// UTF-8
-			Uint32	val;
-			i += ReadUTF8(&Buffer[i], &val) - 1;
-			VT_int_PutChar(Term, val);
+		else {
+			//Debug("Escape code '%.*s'", esc_len, Buffer+ofs);
 		}
+		ASSERTCR(esc_len, >, 0, );
+		ofs += esc_len;
 	}
 	// Update Screen
-	VT_int_UpdateScreen( Term, 0 );
+	VT_int_UpdateScreen( Term, 1 );
+}
+
+void VT_int_PutRawString(tVTerm *Term, const Uint8 *String, size_t Bytes)
+{
+	for( int i = 0; i < Bytes; ) {
+		Uint32	val;
+		i += ReadUTF8(String+i, &val);
+		VT_int_PutChar(Term, val);
+	}
 }
 
 /**
@@ -50,14 +55,17 @@ void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
 	 int	i;
 	tVT_Char	*buffer;
 	 int	write_pos;
+	 int	limit;
 	
 	if(Term->Flags & VT_FLAG_ALTBUF) {
 		buffer = Term->AltBuf;
 		write_pos = Term->AltWritePos;
+		limit = Term->TextHeight * Term->TextWidth;
 	}
 	else {
 		buffer = Term->Text;
 		write_pos = Term->WritePos;
+		limit = Term->TextHeight*(giVT_Scrollback+1) * Term->TextWidth;
 	}
 	
 	switch(Ch)
@@ -104,6 +112,7 @@ void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
 		break;
 	
 	default:
+		ASSERTC(write_pos,<,limit);
 		buffer[ write_pos ].Ch = Ch;
 		buffer[ write_pos ].Colour = Term->CurColour;
 		// Update the line before wrapping
@@ -117,19 +126,18 @@ void VT_int_PutChar(tVTerm *Term, Uint32 Ch)
 	{
 		Term->AltWritePos = write_pos;
 		
-		if(Term->AltWritePos >= Term->TextWidth*Term->TextHeight)
+		if(Term->AltWritePos >= limit)
 		{
 			Term->AltWritePos -= Term->TextWidth;
 			VT_int_ScrollText(Term, 1);
 		}
-		
 	}
 	else
 	{
 		Term->WritePos = write_pos;
 		// Move Screen
 		// - Check if we need to scroll the entire scrollback buffer
-		if(Term->WritePos >= Term->TextWidth*Term->TextHeight*(giVT_Scrollback+1))
+		if(Term->WritePos >= limit)
 		{
 			 int	base;
 			
@@ -266,15 +274,13 @@ void VT_int_ScrollText(tVTerm *Term, int Count)
  */
 void VT_int_ClearLine(tVTerm *Term, int Num)
 {
-	 int	i;
-	tVT_Char	*cell;
-	
-	if( Num < 0 || Num >= Term->TextHeight * (giVT_Scrollback + 1) )	return ;
+	 int	limit = Term->TextHeight * (Term->Flags & VT_FLAG_ALTBUF ? 1 : giVT_Scrollback + 1);
+	tVT_Char	*buffer = (Term->Flags & VT_FLAG_ALTBUF ? Term->AltBuf : Term->Text);
+	if( Num < 0 || Num >= limit )	return ;
 	
-	cell = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltBuf : Term->Text;
-	cell = &cell[ Num*Term->TextWidth ];
+	tVT_Char	*cell = &buffer[ Num*Term->TextWidth ];
 	
-	for( i = Term->TextWidth; i--; )
+	for( int i = 0; i < Term->TextWidth; i ++ )
 	{
 		cell[ i ].Ch = 0;
 		cell[ i ].Colour = Term->CurColour;
diff --git a/KernelLand/Kernel/drv/vterm_vt100.c b/KernelLand/Kernel/drv/vterm_vt100.c
index 1a51a583..bab78022 100644
--- a/KernelLand/Kernel/drv/vterm_vt100.c
+++ b/KernelLand/Kernel/drv/vterm_vt100.c
@@ -5,377 +5,203 @@
  * drv/vterm_vt100.c
  * - Virtual Terminal - VT100 (Kinda) Emulation
  */
+#define DEBUG	0
 #include "vterm.h"
 
-// === CONSTANTS ===
-const Uint16	caVT100Colours[] = {
-		// Black, Red, Green, Yellow, Blue, Purple, Cyan, Gray
-		// Same again, but bright
-		VT_COL_BLACK, 0x700, 0x070, 0x770, 0x007, 0x707, 0x077, 0xAAA,
-		VT_COL_GREY, 0xF00, 0x0F0, 0xFF0, 0x00F, 0xF0F, 0x0FF, VT_COL_WHITE
-	};
+#define sTerminal	sVTerm
+#include "../../../Usermode/Applications/gui_terminal_src/vt100.c"
 
-// === CODE ===
-/**
- * \brief Handle a standard large escape code
- * 
- * Handles any escape code of the form \x1B[n,...A where n is an integer
- * and A is any letter.
- */
-void VT_int_ParseEscape_StandardLarge(tVTerm *Term, char CmdChar, int argc, int *args)
+void Display_AddText(tTerminal *Term, size_t Length, const char *UTF8Text)
+{
+	VT_int_PutRawString(Term, (const void*)UTF8Text, Length);
+}
+void Display_Newline(tTerminal *Term, bool bCarriageReturn)
+{
+	LOG("");
+	VT_int_PutChar(Term, '\n');
+}
+void Display_SetScrollArea(tTerminal *Term, int Start, int Count)
 {
-	 int	tmp = 1;
-	switch(CmdChar)
+	LOG("(%i,+%i)", Start, Count);
+	Term->ScrollTop = Start;
+	Term->ScrollHeight = Count;
+}
+void Display_ScrollDown(tTerminal *Term, int CountDown)
+{
+	LOG("(%i)", CountDown);
+	VT_int_UpdateScreen(Term, 0);
+	if( Term->Flags & VT_FLAG_ALTBUF )
+		VT_int_ScrollText(Term, CountDown);
+	else
 	{
-	// Left
-	case 'D':
-		tmp = -1;
-	// Right
-	case 'C':
-		if(argc == 1)	tmp *= args[0];
-		if( Term->Flags & VT_FLAG_ALTBUF )
+		if(Term->ViewPos/Term->TextWidth + CountDown < 0)
+			return ;
+		if(Term->ViewPos/Term->TextWidth + CountDown  > Term->TextHeight * (giVT_Scrollback + 1))
+			return ;
+		
+		Term->ViewPos += Term->TextWidth * CountDown;
+	}
+}
+void Display_SetCursor(tTerminal *Term, int Row, int Col)
+{
+	LOG("(R%i,C%i)", Row, Col);
+	VT_int_UpdateScreen(Term, 0);
+	 int	maxrows = ((Term->Flags & VT_FLAG_ALTBUF) ? 1 : (giVT_Scrollback+1))*Term->TextHeight;
+	ASSERTCR( Row, >=, 0, );
+	ASSERTCR( Row, <, maxrows, );
+	ASSERTCR( Col, >=, 0, );
+	ASSERTCR( Col, <, Term->TextWidth, );
+	*(Term->Flags & VT_FLAG_ALTBUF ? &Term->AltWritePos : &Term->WritePos) = Row*Term->TextWidth + Col;
+}
+void Display_MoveCursor(tTerminal *Term, int RelRow, int RelCol)
+{
+	LOG("(R+%i,C+%i)", RelRow, RelCol);
+	int	*wrpos = (Term->Flags & VT_FLAG_ALTBUF ? &Term->AltWritePos : &Term->WritePos);
+
+	if( RelCol != 0 )
+	{
+		// 
+		if( RelCol < 0 )
 		{
-			if( (Term->AltWritePos + tmp) % Term->TextWidth == 0 ) {
-				Term->AltWritePos -= Term->AltWritePos % Term->TextWidth;
-				Term->AltWritePos += Term->TextWidth - 1;
-			}
-			else
-				Term->AltWritePos += tmp;
+			size_t	avail = *wrpos % Term->TextWidth;
+			if( RelCol < -avail )
+				RelCol = -avail;
 		}
 		else
 		{
-			if( (Term->WritePos + tmp) % Term->TextWidth == 0 ) {
-				Term->WritePos -= Term->WritePos % Term->TextWidth;
-				Term->WritePos += Term->TextWidth - 1;
-			}
-			else
-				Term->WritePos += tmp;
+			size_t	avail = Term->TextWidth - (*wrpos % Term->TextWidth);
+			if(RelCol > avail)
+				RelCol = avail;
 		}
-		break;
-	
-	// Erase
-	case 'J':
-		switch(args[0])
-		{
-		case 0:	// Erase below
-			break;
-		case 1:	// Erase above
-			break;
-		case 2:	// Erase all
-			if( Term->Flags & VT_FLAG_ALTBUF )
-			{
-				 int	i = Term->TextHeight;
-				while( i-- )	VT_int_ClearLine(Term, i);
-				Term->AltWritePos = 0;
-				VT_int_UpdateScreen(Term, 1);
-			}
-			else
-			{
-				 int	i = Term->TextHeight * (giVT_Scrollback + 1);
-				while( i-- )	VT_int_ClearLine(Term, i);
-				Term->WritePos = 0;
-				Term->ViewPos = 0;
-				VT_int_UpdateScreen(Term, 1);
-			}
-			break;
-		}
-		break;
-	
-	// Erase in line
-	case 'K':
-		switch(args[0])
+		*wrpos += RelCol;
+	}
+	if( RelRow != 0 )
+	{
+		 int	currow = *wrpos / Term->TextWidth;
+		 int	maxrows = ((Term->Flags & VT_FLAG_ALTBUF) ? 1 : (giVT_Scrollback+1))*Term->TextHeight;
+		if( RelRow < 0 )
 		{
-		case 0:	// Erase to right
-			if( Term->Flags & VT_FLAG_ALTBUF )
-			{
-				 int	i, max;
-				max = Term->Width - Term->AltWritePos % Term->Width;
-				for( i = 0; i < max; i ++ )
-					Term->AltBuf[Term->AltWritePos+i].Ch = 0;
-			}
-			else
-			{
-				 int	i, max;
-				max = Term->Width - Term->WritePos % Term->Width;
-				for( i = 0; i < max; i ++ )
-					Term->Text[Term->WritePos+i].Ch = 0;
-			}
-			VT_int_UpdateScreen(Term, 0);
-			break;
-		case 1:	// Erase to left
-			if( Term->Flags & VT_FLAG_ALTBUF )
-			{
-				 int	i = Term->AltWritePos % Term->Width;
-				while( i -- )
-					Term->AltBuf[Term->AltWritePos++].Ch = 0;
-			}
-			else
-			{
-				 int	i = Term->WritePos % Term->Width;
-				while( i -- )
-					Term->Text[Term->WritePos++].Ch = 0;
-			}
-			VT_int_UpdateScreen(Term, 0);
-			break;
-		case 2:	// Erase all
-			if( Term->Flags & VT_FLAG_ALTBUF )
-			{
-				VT_int_ClearLine(Term, Term->AltWritePos / Term->Width);
-			}
-			else
-			{
-				VT_int_ClearLine(Term, Term->WritePos / Term->Width);
-			}
-			VT_int_UpdateScreen(Term, 0);
-			break;
+			if( currow + RelRow < 0 )
+				RelRow = currow;
 		}
-		break;
-	
-	// Set cursor position
-	case 'H':
-		if( Term->Flags & VT_FLAG_ALTBUF )
-			Term->AltWritePos = args[1] + args[0]*Term->TextWidth;
 		else
-			Term->WritePos = args[1] + args[0]*Term->TextWidth;
-		//Log_Debug("VTerm", "args = {%i, %i}", args[0], args[1]);
-		break;
-	// Scroll up `n` lines
-	case 'S':
-		tmp = -1;
-	// Scroll down `n` lines
-	case 'T':
-		if(argc == 1)	tmp *= args[0];
-		if( Term->Flags & VT_FLAG_ALTBUF )
-			VT_int_ScrollText(Term, tmp);
-		else
-		{
-			if(Term->ViewPos/Term->TextWidth + tmp < 0)
-				break;
-			if(Term->ViewPos/Term->TextWidth + tmp  > Term->TextHeight * (giVT_Scrollback + 1))
-				break;
-			
-			Term->ViewPos += Term->TextWidth*tmp;
-		}
-		break;
-	// Set Mode (?)
-	case 'h':
-		if( argc >= 1 )
-		{
-			switch(args[0])
-			{
-			case 2:	// Keyboard action mode
-			case 4:	// Insert mode
-			case 12:	// Send/receive
-			case 20:	// Automatic newline
-				break;
-			default:	// ?
-				break;
-			}
-		}
-		break;
-		
-	// Set Font flags
-	case 'm':
-		for( ; argc--; )
 		{
-			 int	colour_idx;
-			// Flags
-			if( 0 <= args[argc] && args[argc] <= 8)
-			{
-				switch(args[argc])
-				{
-				case 0:	Term->CurColour = DEFAULT_COLOUR;	break;	// Reset
-				case 1:	Term->CurColour |= 0x80000000;	break;	// Bright
-				case 2:	Term->CurColour &= ~0x80000000;	break;	// Dim
-				}
-			}
-			// Foreground Colour
-			else if(30 <= args[argc] && args[argc] <= 37) {
-				// Get colour index, accounting for bright bit
-				colour_idx = args[argc]-30 + ((Term->CurColour>>28) & 8);
-				Term->CurColour &= 0x8000FFFF;
-				Term->CurColour |= (Uint32)caVT100Colours[ colour_idx ] << 16;
-			}
-			// Background Colour
-			else if(40 <= args[argc] && args[argc] <= 47) {
-				// Get colour index, accounting for bright bit
-				colour_idx = args[argc]-40 + ((Term->CurColour>>12) & 8);
-				Term->CurColour &= 0xFFFF8000;
-				Term->CurColour |= caVT100Colours[ colour_idx ];
-			}
-			// Foreground Colour - bright
-			else if(90 <= args[argc] && args[argc] <= 97 ) {
-				colour_idx = args[argc]-90 + 8;
-				Term->CurColour &= 0x8000FFFF;
-				Term->CurColour |= (Uint32)caVT100Colours[ colour_idx ] << 16;
-			}
-			// Background Colour - bright
-			else if(100 <= args[argc] && args[argc] <= 107 ) {
-				colour_idx = args[argc]-100 + 8;
-				Term->CurColour &= 0xFFFF8000;
-				Term->CurColour |= (Uint32)caVT100Colours[ colour_idx ];
-			}
-			else {
-				Log_Warning("VTerm", "Unknown font flag %i", args[argc]);
-			}
+			if( currow + RelRow > maxrows-1 )
+				RelRow = maxrows-1 - currow;
 		}
-		break;
-	
-	// Set scrolling region
-	case 'r':
-		if( argc != 2 )	break;
-		Term->ScrollTop = args[0];
-		Term->ScrollHeight = args[1] - args[0];
-		break;
-
-	// Save cursor position
-	case 's':
-		if( argc != 0 )	break;
-		Term->SavedWritePos = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltWritePos : Term->WritePos;
-		break;
-
-	// Restore saved cursor position
-	case 'u':
-		if( argc != 0 )	break;
-		*((Term->Flags & VT_FLAG_ALTBUF) ? &Term->AltWritePos : &Term->WritePos) = Term->SavedWritePos;
-		break;
-
-	default:
-		Log_Warning("VTerm", "Unknown control sequence '\\x1B[%c'", CmdChar);
-		break;
+		*wrpos += RelRow*Term->TextWidth;
 	}
 }
-
-/**
- * \fn int VT_int_ParseEscape(tVTerm *Term, const char *Buffer)
- * \brief Parses a VT100 Escape code
- */
-int VT_int_ParseEscape(tVTerm *Term, const char *Buffer, size_t Bytes)
+void Display_SaveCursor(tTerminal *Term)
+{
+	Term->SavedWritePos = (Term->Flags & VT_FLAG_ALTBUF) ? Term->AltWritePos : Term->WritePos;
+	LOG("Saved = %i", Term->SavedWritePos);
+}
+void Display_RestoreCursor(tTerminal *Term)
 {
-	char	c;
-	 int	argc = 0, j = 0;
-	 int	args[6] = {0,0,0,0};
-	 int	bQuestionMark = 0;
-	const int	ofs = Term->EscapeCodeLen;
-	const int	sparespace = sizeof(Term->EscapeCodeCache)-Term->EscapeCodeLen;
-	const int	copysize = MIN(Bytes, sparespace);
+	 int	max = ((Term->Flags & VT_FLAG_ALTBUF) ? 1 : (giVT_Scrollback+1))*Term->TextHeight * Term->TextWidth;
+	 int	*wrpos = ((Term->Flags & VT_FLAG_ALTBUF) ? &Term->AltWritePos : &Term->WritePos);
+	if( Term->SavedWritePos >= max )
+		*wrpos = max-1;
+	else
+		*wrpos = Term->SavedWritePos;
+	LOG("Restored %i", *wrpos);
+}
+// 0: All, 1: Forward, -1: Reverse
+void Display_ClearLine(tTerminal *Term, int Dir)
+{
+	 int	*wrpos = (Term->Flags & VT_FLAG_ALTBUF ? &Term->AltWritePos : &Term->WritePos);
+	tVT_Char	*buffer = (Term->Flags & VT_FLAG_ALTBUF ? Term->AltBuf : Term->Text);
 
-	memcpy( Term->EscapeCodeCache + Term->EscapeCodeLen, Buffer, copysize );
-	Term->EscapeCodeLen += copysize;
-	
-	Bytes = Term->EscapeCodeLen;
-	Buffer = Term->EscapeCodeCache;
+	LOG("(Dir=%i)", Dir);	
 
-	if( Bytes == j )	return j-ofs;
-	c = Buffer[j++];
-	if(c != '\x1b') {
-		Term->EscapeCodeLen = 0;
-		return 0;
+	// Erase all
+	if( Dir == 0 ) {
+		VT_int_ClearLine(Term, *wrpos / Term->Width);
+		VT_int_UpdateScreen(Term, 0);
 	}
-
-	if( Bytes == j )	return j-ofs;
-	c = Buffer[j++];
-
-	switch(c)
-	{
-	//Large Code
-	case '[':
-		// Get Arguments
-		if(Bytes == j)	return j-ofs;
-		c = Buffer[j++];
-		if(c == '?') {
-			bQuestionMark = 1;
-			if(Bytes == j)	return j-ofs;
-			c = Buffer[j++];
-		}
-		if( '0' <= c && c <= '9' )
-		{
-			do {
-				if(c == ';') {
-					if(Bytes == j)	return j-ofs;
-					c = Buffer[j++];
-				}
-				while('0' <= c && c <= '9') {
-					args[argc] *= 10;
-					args[argc] += c-'0';
-					if(Bytes == j)	return j-ofs;
-					c = Buffer[j++];
-				}
-				argc ++;
-			} while(c == ';');
-		}
-		
-		// Get Command
-		if( !('a' <= c && c <= 'z') && !('A' <= c && c <= 'Z') )
-		{
-			// Error - eat ESC only?
-			// > j : Entire code skipped
-			Term->EscapeCodeLen = 0;
-			return j-ofs;
-		}
+	// Erase to right
+	else if( Dir == 1 ) {
+		int max = Term->Width - *wrpos % Term->Width;
+		for( int i = 0; i < max; i ++ )
+			buffer[*wrpos+i].Ch = 0;
+		VT_int_UpdateScreen(Term, 0);
+	}
+	// Erase to left
+	else if( Dir == -1 ) {
+		int start = *wrpos - *wrpos % Term->Width;
+		for( int i = start; i < *wrpos; i ++ )
+			buffer[i].Ch = 0;
+		VT_int_UpdateScreen(Term, 0);
+	}
+	else {
+		// ERROR!
+		ASSERTC(Dir, >=, -1);
+		ASSERTC(Dir, <=, 1);
+	}
+}
+void Display_ClearLines(tTerminal *Term, int Dir)
+{
+	LOG("(Dir=%i)", Dir);	
+	 int	*wrpos = (Term->Flags & VT_FLAG_ALTBUF ? &Term->AltWritePos : &Term->WritePos);
+	tVT_Char	*buffer = (Term->Flags & VT_FLAG_ALTBUF ? Term->AltBuf : Term->Text);
+	
+	// All
+	if( Dir == 0 ) {
+		int count;
 		
-		if( bQuestionMark )
-		{
-			switch(c)
-			{
-			// DEC Private Mode Set
-			case 'h':
-				if(argc != 1)	break;
-				switch(args[0])
-				{
-				case 25:
-					Term->Flags &= ~VT_FLAG_HIDECSR;
-					break;
-				case 1047:
-					VT_int_ToggleAltBuffer(Term, 1);
-					break;
-				}
-				break;
-			case 'l':
-				if(argc != 1)	break;
-				switch(args[0])
-				{
-				case 25:
-					Term->Flags |= VT_FLAG_HIDECSR;
-					break;
-				case 1047:
-					VT_int_ToggleAltBuffer(Term, 0);
-					break;
-				}
-				break;
-			default:
-				Log_Warning("VTerm", "Unknown control sequence '\\x1B[?%c'", c);
-				break;
-			}
+		if( Term->Flags & VT_FLAG_ALTBUF ) {
+			count = Term->TextHeight;
 		}
-		else
-		{
-			VT_int_ParseEscape_StandardLarge(Term, c, argc, args);
+		else {
+			count = Term->TextHeight * (giVT_Scrollback + 1);
+			Term->ViewPos = 0;
 		}
-		break;
-	case '\0':
-		// Ignore \0
-		break;
-	// Reset all attributes
-	case 'c':
-		Term->CurColour = DEFAULT_COLOUR;
-		Term->Flags = 0;
-		Term->ScrollHeight = 0;
-		break;
-	default:
-		//Log_Notice("VTerm", "TODO: Handle short escape codes");
-		{
-			static volatile int tmp = 0;
-			if(tmp == 0) {
-				tmp = 1;
-				Debug("VTerm: Unknown short 0x%x", c);
-				tmp = 0;
-			}
-		}
-		break;
+		while( count -- )
+			VT_int_ClearLine(Term, count);
+		*wrpos = 0;
+		VT_int_UpdateScreen(Term, 1);
+	}
+	// Downwards
+	else if( Dir == 1 ) {
+		Log_Warning("VTerm", "TODO: ClearLines Down");
 	}
+	// Upwards
+	else if( Dir == -1 ) {
+		Log_Warning("VTerm", "TODO: ClearLines Up");
+	}
+	else {
+		// ERROR!
+		ASSERTC(Dir, >=, -1);
+		ASSERTC(Dir, <=, 1);
+	}
+}
+void Display_ResetAttributes(tTerminal *Term)
+{
+	LOG("");	
+	Term->CurColour = DEFAULT_COLOUR;
+}
+void Display_SetForeground(tTerminal *Term, uint32_t RGB)
+{
+	LOG("(%06x)", RGB);
+	Term->CurColour &= 0x8000FFFF;
+	Term->CurColour |= (Uint32)VT_Colour24to12(RGB) << 16;
 	
-	//Log_Debug("VTerm", "j = %i, Buffer = '%s'", j, Buffer);
-	Term->EscapeCodeLen = 0;
-	return j-ofs;
 }
+void Display_SetBackground(tTerminal *Term, uint32_t RGB)
+{
+	LOG("(%06x)", RGB);
+	Term->CurColour &= 0xFFFF8000;
+	Term->CurColour |= (Uint32)VT_Colour24to12(RGB) <<06;
+}
+void Display_Flush(tTerminal *Term)
+{
+	LOG("");
+	VT_int_UpdateScreen(Term, 0);
+}
+void Display_ShowAltBuffer(tTerminal *Term, bool AltBufEnabled)
+{
+	LOG("(%B)", AltBufEnabled);
+	VT_int_ToggleAltBuffer(Term, AltBufEnabled);
+}
+
diff --git a/KernelLand/Kernel/include/api_drv_video.h b/KernelLand/Kernel/include/api_drv_video.h
index 0d681fee..4607b855 100644
--- a/KernelLand/Kernel/include/api_drv_video.h
+++ b/KernelLand/Kernel/include/api_drv_video.h
@@ -273,6 +273,10 @@ extern int	giVT_CharHeight;
  * easing the driver development and reducing code duplication.
  */
 extern void	VT_Font_Render(Uint32 Codepoint, void *Buffer, int Depth, int Pitch, Uint32 BGC, Uint32 FGC);
+/**
+ * \brief Convert a colour from 24bpp 8:8:8 to 12bpp 4:4:4
+ */
+extern Uint16	VT_Colour24to12(Uint32 Col24);
 /**
  * \fn Uint32 VT_Colour12to24(Uint16 Col12)
  * \brief Converts a colour from 12bpp to 24bpp
-- 
2.20.1