Output text (form different data type sources) on screen in text mode. More...

#include <device/textstream.h>

Inheritance diagram for TextStream:

Collaboration diagram for TextStream:

Public Member Functions
	TextStream (unsigned from_col, unsigned to_col, unsigned from_row, unsigned to_row, bool use_cursor=false)
	Constructor of a text window.

	TextStream (void)
	Default constructor.

void	flush ()
	Output the buffer contents of the base class Stringbuffer.

Public Member Functions inherited from OutputStream
	OutputStream ()
	Default constructor. Initial number system is decimal.

virtual	~OutputStream ()
	Destructor.

OutputStream &	operator<< (char c)
	Print a single character.

OutputStream &	operator<< (unsigned char c)
	Print a single character.

OutputStream &	operator<< (const char *string)
	Printing a null-terminated string.

OutputStream &	operator<< (bool b)
	Print a boolean value.

OutputStream &	operator<< (short ival)
	Print an integral number in radix `base`

OutputStream &	operator<< (unsigned short ival)
	Print an integral number in radix `base`

OutputStream &	operator<< (int ival)
	Print an integral number in radix `base`

OutputStream &	operator<< (unsigned int ival)
	Print an integral number in radix `base`

OutputStream &	operator<< (long ival)
	Print an integral number in radix `base`

OutputStream &	operator<< (unsigned long ival)
	Print an integral number in radix `base`

OutputStream &	operator<< (long long ival)
	Print an integral number in radix `base`

OutputStream &	operator<< (unsigned long long ival)
	Print an integral number in radix `base`

OutputStream &	operator<< (const void *ptr)
	Print a pointer as hexadecimal number.

OutputStream &	operator<< (OutputStream &(*f)(OutputStream &))
	Calls one of the manipulator functions.

Public Member Functions inherited from Stringbuffer
virtual	~Stringbuffer ()
	Destructor (nothing to do here)

Public Member Functions inherited from TextWindow
	TextWindow (unsigned from_col, unsigned to_col, unsigned from_row, unsigned to_row, bool use_cursor=false)
	Constructor of a text window.

void	setPos (unsigned rel_x, unsigned rel_y)
	Set the cursor position in the window.

void	setPos (int rel_x, int rel_y)
	Set the cursor position in the window.

void	getPos (unsigned &rel_x, unsigned &rel_y) const
	Get the current cursor position in the window.

void	getPos (int &rel_x, int &rel_y) const
	Get the current cursor position in the window.

void	print (const char *string, size_t length, Attribute attrib=TextMode::Attribute())
	Display multiple characters in the window.

void	reset (char character=' ', Attribute attrib=TextMode::Attribute())
	Delete all contents in the window and reset the cursor.

Static Public Member Functions
static void	arrange (TextStream &kout, TextStream dout[8])
	Automatic arrangement of the output windows (depending on the cores)

Static Public Member Functions inherited from TextMode
static void	setCursor (unsigned abs_x, unsigned abs_y)
	Set the keyboard hardware cursor to absolute screen position.

static void	getCursor (unsigned &abs_x, unsigned &abs_y)
	Retrieve the keyboard hardware cursor position on screen.

static void	show (unsigned abs_x, unsigned abs_y, char character, Attribute attrib=Attribute())
	Basic output of a character at a specific position on the screen.

static void	show (int abs_x, int abs_y, char character, Attribute attrib=Attribute())
	Basic output of a character at a specific position on the screen.

Private Member Functions
	TextStream (const TextStream &)=delete

TextStream &	operator= (const TextStream &)=delete

Static Private Attributes
static unsigned	current_row = 0
	store the current position when using the default constructor

Additional Inherited Members
Public Types inherited from TextMode
enum	Color { BLACK , BLUE , GREEN , CYAN , RED , MAGENTA , BROWN , LIGHT_GREY , DARK_GREY , LIGHT_BLUE , LIGHT_GREEN , LIGHT_CYAN , LIGHT_RED , LIGHT_MAGENTA , YELLOW , WHITE }
	CGA color palette. More...

Public Attributes inherited from OutputStream
int	base
	Number system used for printing integral numbers (one of 2, 8, 10, or 16)

Static Public Attributes inherited from TextMode
static const unsigned	ROWS = 25
	Visible rows in text mode.

static const unsigned	COLUMNS = 80
	Visible columns in text mode.

Protected Member Functions inherited from Stringbuffer
	Stringbuffer ()
	Constructor; Marks the buffer as empty.

void	put (char c)
	Inserts a character into the buffer.

Protected Member Functions inherited from TextMode
	TextMode ()
	Default constructor.

Protected Attributes inherited from Stringbuffer
char	buffer [80]
	buffer containing characters that will be printed upon flush()

long unsigned	pos
	current position in the buffer

Protected Attributes inherited from TextWindow
unsigned	from_col
	Start column position (inclusive) of window.

unsigned	to_col
	End column position (exclusive) of window.

unsigned	from_row
	Start row position (inclusive) of window.

unsigned	to_row
	End row position (exclusive) of window.

bool	use_cursor
	use hardware cursor

unsigned	pos_x
	Software cursor column.

unsigned	pos_y
	Software cursor row.

Static Protected Attributes inherited from TextMode
static Cell *const	TEXT_BUFFER_BASE = reinterpret_cast<TextMode::Cell *>(0xb8000)
	Base address for linear text buffer in video memory.

Detailed Description

Output text (form different data type sources) on screen in text mode.

Allows the output of different data types as strings on the TextMode screen of a PC. To achieve this, TextStream is derived from both OutputStream and TextWindow and only implements the method TextStream::flush(). Further formatting or special effects are implemented in TextWindow.

Constructor & Destructor Documentation

◆ TextStream() [1/3]

TextStream::TextStream ( const TextStream & )

privatedelete

◆ TextStream() [2/3]

TextStream::TextStream	(	unsigned	from_col,
		unsigned	to_col,
		unsigned	from_row,
		unsigned	to_row,
		bool	use_cursor = `false`
	)

inline

Constructor of a text window.

Creates a virtual, rectangular text window on the screen. The coordinates to construct the window are absolute positions in the TextMode screen.

Note: Overlapping windows are neither supported nor prevented – better just try to avoid construction windows with overlapping coordinates!

Warning: Don't use the hardware cursor in more than one window!

Parameters

from_col	Text Window starts in column `from_col`, the first (leftmost) possible column is `0`
to_col	Text Window extends to the right to column `to_col` (exclusive). This column has to be strictly greater than `from_col`, the maximum allowed value is TextMode::COLUMNS (rightmost)
from_row	Text Window starts in row `from_row`, the first possible (uppermost) row is `0`
to_row	Text Window extends down to row `to_row` (exclusive). This row has to be strictly greater than `from_row`, the maximum allowed value is TextMode::ROWS (bottom-most)
use_cursor	Specifies whether the hardware cursor (`true`) or a software cursor/variable (`false`) should be used to store the current position

Todo:: Implement constructor

◆ TextStream() [3/3]

TextStream::TextStream ( void )

inline

Default constructor.

Since each core in MPStuBS has its own debug window, but the number of available cores might be different on each system, the arrangement can be done automatically.

However, there is one problem: The number of CPUs is only known after evaluating the ACPI MADT table (which is done in APIC::init(), called during kernel_init()), but global constructors like ‘kout’ are executed earlier.

Therefore this constructor assigns each window 2 separate lines for the output, the actual window split is later done by calling TextStream::arrange() in main().

Optional:: Implement Constructor. For testing purposes you can simply overwrite the predefined number of cores for Qemu/KVM in the Makefile from the command line, e.g: make QEMUCPUS=6 kvm

Member Function Documentation

◆ operator=()

TextStream & TextStream::operator= ( const TextStream & )

privatedelete

◆ arrange()

void TextStream::arrange	(	TextStream &	kout,
		TextStream	dout[8]
	)

static

Automatic arrangement of the output windows (depending on the cores)

After the system information has been read out, the number of available cores can be queried with Core::count(). This information helps to automatically arrange the windows without wasting screen area by pre-saving it for non-existent cores.

Parameters

kout	Pointer to the object for the main output window
dout	Pointer to an array with with debug windows for each core

Optional:: Implement method

◆ flush()

void TextStream::flush ( )

virtual

Output the buffer contents of the base class Stringbuffer.

The method is automatically called when the buffer is full, but can also be called explicitly to force output of the current buffer.

Todo:: Implement method

Implements OutputStream.

Member Data Documentation

◆ current_row

unsigned TextStream::current_row = 0

staticprivate

store the current position when using the default constructor

The documentation for this class was generated from the following files:

device/textstream.h
device/textstream.cc

Public Member Functions

Static Public Member Functions

Private Member Functions

Static Private Attributes

Additional Inherited Members