Function CmdCursorLineUp

source/Debugger/Debug.cpp:3382–3603

===========================================================================

//===========================================================================
Update_t CmdCursorLineUp (int nArgs)
{
	int nBytes = 1;
	
	if (g_iWindowThis == WINDOW_DATA)
	{
		_CursorMoveUpAligned( WINDOW_DATA_BYTES_PER_LINE );
	}
	else
	if (nArgs)
	{
		nBytes = nArgs; // HACK: g_aArgs[1].nValue

		g_nDisasmTopAddress--;
		DisasmCalcCurFromTopAddress();
		DisasmCalcBotFromTopAddress();
	}
	else
	{
//		if (! g_nDisasmCurLine)
//		{
//			g_nDisasmCurLine = 1;
//			DisasmCalcTopFromCurAddress( false );
			
//			g_nDisasmCurLine = 0;
//			DisasmCalcCurFromTopAddress();
//			DisasmCalcBotFromTopAddress();
//			return UPDATE_DISASM;
//		}

		// SmartLineUp()
		// Figure out if we should move up 1, 2, or 3 bytes since we have 2 possible cases:
		//
		// a) Scroll up by 2 bytes
		//    xx-2: A9 yy      LDA #xx
		//    xxxx: top
		//
		// b) Scroll up by 3 bytes
		//    xx-3: 20 A9 xx   JSR $00A9
		//    xxxx: top of window
		// 
#define DEBUG_SCROLL 3

#if DEBUG_SCROLL == 1
		WORD nCur = g_nDisasmCurAddress - nBytes;

		// Adjust Top until nNewCur is at > Cur
		do
		{
			g_nDisasmTopAddress--;
			DisasmCalcCurFromTopAddress();
		} while (g_nDisasmCurAddress > nCur);
#endif

#if DEBUG_SCROLL == 2
		WORD nCur = g_nDisasmCurAddress - nBytes;

		int iOpcode;