/** @file
Implementation for EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL protocol.
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "Terminal.h"
//
// This list is used to define the valid extend chars.
// It also provides a mapping from Unicode to PCANSI or
// ASCII. The ASCII mapping we just made up.
//
//
UNICODE_TO_CHAR UnicodeToPcAnsiOrAscii[] = {
{ BOXDRAW_HORIZONTAL, 0xc4, L'-' },
{ BOXDRAW_VERTICAL, 0xb3, L'|' },
{ BOXDRAW_DOWN_RIGHT, 0xda, L'/' },
{ BOXDRAW_DOWN_LEFT, 0xbf, L'\\' },
{ BOXDRAW_UP_RIGHT, 0xc0, L'\\' },
{ BOXDRAW_UP_LEFT, 0xd9, L'/' },
{ BOXDRAW_VERTICAL_RIGHT, 0xc3, L'|' },
{ BOXDRAW_VERTICAL_LEFT, 0xb4, L'|' },
{ BOXDRAW_DOWN_HORIZONTAL, 0xc2, L'+' },
{ BOXDRAW_UP_HORIZONTAL, 0xc1, L'+' },
{ BOXDRAW_VERTICAL_HORIZONTAL, 0xc5, L'+' },
{ BOXDRAW_DOUBLE_HORIZONTAL, 0xcd, L'-' },
{ BOXDRAW_DOUBLE_VERTICAL, 0xba, L'|' },
{ BOXDRAW_DOWN_RIGHT_DOUBLE, 0xd5, L'/' },
{ BOXDRAW_DOWN_DOUBLE_RIGHT, 0xd6, L'/' },
{ BOXDRAW_DOUBLE_DOWN_RIGHT, 0xc9, L'/' },
{ BOXDRAW_DOWN_LEFT_DOUBLE, 0xb8, L'\\' },
{ BOXDRAW_DOWN_DOUBLE_LEFT, 0xb7, L'\\' },
{ BOXDRAW_DOUBLE_DOWN_LEFT, 0xbb, L'\\' },
{ BOXDRAW_UP_RIGHT_DOUBLE, 0xd4, L'\\' },
{ BOXDRAW_UP_DOUBLE_RIGHT, 0xd3, L'\\' },
{ BOXDRAW_DOUBLE_UP_RIGHT, 0xc8, L'\\' },
{ BOXDRAW_UP_LEFT_DOUBLE, 0xbe, L'/' },
{ BOXDRAW_UP_DOUBLE_LEFT, 0xbd, L'/' },
{ BOXDRAW_DOUBLE_UP_LEFT, 0xbc, L'/' },
{ BOXDRAW_VERTICAL_RIGHT_DOUBLE, 0xc6, L'|' },
{ BOXDRAW_VERTICAL_DOUBLE_RIGHT, 0xc7, L'|' },
{ BOXDRAW_DOUBLE_VERTICAL_RIGHT, 0xcc, L'|' },
{ BOXDRAW_VERTICAL_LEFT_DOUBLE, 0xb5, L'|' },
{ BOXDRAW_VERTICAL_DOUBLE_LEFT, 0xb6, L'|' },
{ BOXDRAW_DOUBLE_VERTICAL_LEFT, 0xb9, L'|' },
{ BOXDRAW_DOWN_HORIZONTAL_DOUBLE, 0xd1, L'+' },
{ BOXDRAW_DOWN_DOUBLE_HORIZONTAL, 0xd2, L'+' },
{ BOXDRAW_DOUBLE_DOWN_HORIZONTAL, 0xcb, L'+' },
{ BOXDRAW_UP_HORIZONTAL_DOUBLE, 0xcf, L'+' },
{ BOXDRAW_UP_DOUBLE_HORIZONTAL, 0xd0, L'+' },
{ BOXDRAW_DOUBLE_UP_HORIZONTAL, 0xca, L'+' },
{ BOXDRAW_VERTICAL_HORIZONTAL_DOUBLE, 0xd8, L'+' },
{ BOXDRAW_VERTICAL_DOUBLE_HORIZONTAL, 0xd7, L'+' },
{ BOXDRAW_DOUBLE_VERTICAL_HORIZONTAL, 0xce, L'+' },
{ BLOCKELEMENT_FULL_BLOCK, 0xdb, L'*' },
{ BLOCKELEMENT_LIGHT_SHADE, 0xb0, L'+' },
{ GEOMETRICSHAPE_UP_TRIANGLE, 0x1e, L'^' },
{ GEOMETRICSHAPE_RIGHT_TRIANGLE, 0x10, L'>' },
{ GEOMETRICSHAPE_DOWN_TRIANGLE, 0x1f, L'v' },
{ GEOMETRICSHAPE_LEFT_TRIANGLE, 0x11, L'<' },
{ ARROW_LEFT, 0x3c, L'<' },
{ ARROW_UP, 0x18, L'^' },
{ ARROW_RIGHT, 0x3e, L'>' },
{ ARROW_DOWN, 0x19, L'v' },
{ 0x0000, 0x00, L'\0' }
};
CHAR16 mSetModeString[] = { ESC, '[', '=', '3', 'h', 0 };
CHAR16 mSetAttributeString[] = { ESC, '[', '0', 'm', ESC, '[', '4', '0', 'm', ESC, '[', '4', '0', 'm', 0 };
CHAR16 mClearScreenString[] = { ESC, '[', '2', 'J', 0 };
CHAR16 mSetCursorPositionString[] = { ESC, '[', '0', '0', ';', '0', '0', 'H', 0 };
//
// Body of the ConOut functions
//
/**
Implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.Reset().
If ExtendeVerification is TRUE, then perform dependent serial device reset,
and set display mode to mode 0.
If ExtendedVerification is FALSE, only set display mode to mode 0.
@param This Indicates the calling context.
@param ExtendedVerification Indicates that the driver may perform a more
exhaustive verification operation of the device
during reset.
@retval EFI_SUCCESS The reset operation succeeds.
@retval EFI_DEVICE_ERROR The terminal is not functioning correctly or the serial port reset fails.
**/
EFI_STATUS
EFIAPI
TerminalConOutReset (
IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This,
IN BOOLEAN ExtendedVerification
)
{
EFI_STATUS Status;
TERMINAL_DEV *TerminalDevice;
TerminalDevice = TERMINAL_CON_OUT_DEV_FROM_THIS (This);
//
// Perform a more exhaustive reset by resetting the serial port.
//
if (ExtendedVerification) {
//
// Report progress code here
//
REPORT_STATUS_CODE_WITH_DEVICE_PATH (
EFI_PROGRESS_CODE,
(EFI_PERIPHERAL_REMOTE_CONSOLE | EFI_P_PC_RESET),
TerminalDevice->DevicePath
);
Status = TerminalDevice->SerialIo->Reset (TerminalDevice->SerialIo);
if (EFI_ERROR (Status)) {
//
// Report error code here
//
REPORT_STATUS_CODE_WITH_DEVICE_PATH (
EFI_ERROR_CODE | EFI_ERROR_MINOR,
(EFI_PERIPHERAL_REMOTE_CONSOLE | EFI_P_EC_CONTROLLER_ERROR),
TerminalDevice->DevicePath
);
return Status;
}
}
This->SetAttribute (This, EFI_TEXT_ATTR (This->Mode->Attribute & 0x0F, EFI_BLACK));
Status = This->SetMode (This, 0);
return Status;
}
/**
Implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.OutputString().
The Unicode string will be converted to terminal expressible data stream
and send to terminal via serial port.
@param This Indicates the calling context.
@param WString The Null-terminated Unicode string to be displayed
on the terminal screen.
@retval EFI_SUCCESS The string is output successfully.
@retval EFI_DEVICE_ERROR The serial port fails to send the string out.
@retval EFI_WARN_UNKNOWN_GLYPH Indicates that some of the characters in the Unicode string could not
be rendered and are skipped.
@retval EFI_UNSUPPORTED If current display mode is out of range.
**/
EFI_STATUS
EFIAPI
TerminalConOutOutputString (
IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This,
IN CHAR16 *WString
)
{
TERMINAL_DEV *TerminalDevice;
EFI_SIMPLE_TEXT_OUTPUT_MODE *Mode;
UINTN MaxColumn;
UINTN MaxRow;
UINTN Length;
UTF8_CHAR Utf8Char;
CHAR8 GraphicChar;
CHAR8 AsciiChar;
EFI_STATUS Status;
UINT8 ValidBytes;
//
// flag used to indicate whether condition happens which will cause
// return EFI_WARN_UNKNOWN_GLYPH
//
BOOLEAN Warning;
ValidBytes = 0;
Warning = FALSE;
AsciiChar = 0;
//
// get Terminal device data structure pointer.
//
TerminalDevice = TERMINAL_CON_OUT_DEV_FROM_THIS (This);
//
// Get current display mode
//
Mode = This->Mode;
if (Mode->Mode >= Mode->MaxMode) {
return EFI_UNSUPPORTED;
}
This->QueryMode (
This,
Mode->Mode,
&MaxColumn,
&MaxRow
);
for (; *WString != CHAR_NULL; WString++) {
switch (TerminalDevice->TerminalType) {
case PCANSITYPE:
case VT100TYPE:
case VT100PLUSTYPE:
case TTYTERMTYPE:
if (!TerminalIsValidTextGraphics (*WString, &GraphicChar, &AsciiChar)) {
//
// If it's not a graphic character convert Unicode to ASCII.
//
GraphicChar = (CHAR8) *WString;
if (!(TerminalIsValidAscii (GraphicChar) || TerminalIsValidEfiCntlChar (GraphicChar))) {
//
// when this driver use the OutputString to output control string,
// TerminalDevice->OutputEscChar is set to let the Esc char
// to be output to the terminal emulation software.
//
if ((GraphicChar == 27) && TerminalDevice->OutputEscChar) {
GraphicChar = 27;
} else {
GraphicChar = '?';
Warning = TRUE;
}
}
AsciiChar = GraphicChar;
}
if (TerminalDevice->TerminalType != PCANSITYPE) {
GraphicChar = AsciiChar;
}
Length = 1;
Status = TerminalDevice->SerialIo->Write (
TerminalDevice->SerialIo,
&Length,
&GraphicChar
);
if (EFI_ERROR (Status)) {
goto OutputError;
}
break;
case VTUTF8TYPE:
UnicodeToUtf8 (*WString, &Utf8Char, &ValidBytes);
Length = ValidBytes;
Status = TerminalDevice->SerialIo->Write (
TerminalDevice->SerialIo,
&Length,
(UINT8 *) &Utf8Char
);
if (EFI_ERROR (Status)) {
goto OutputError;
}
break;
}
//
// Update cursor position.
//
switch (*WString) {
case CHAR_BACKSPACE:
if (Mode->CursorColumn > 0) {
Mode->CursorColumn--;
}
break;
case CHAR_LINEFEED:
if (Mode->CursorRow < (INT32) (MaxRow - 1)) {
Mode->CursorRow++;
}
break;
case CHAR_CARRIAGE_RETURN:
Mode->CursorColumn = 0;
break;
default:
if (Mode->CursorColumn < (INT32) (MaxColumn - 1)) {
Mode->CursorColumn++;
} else {
Mode->CursorColumn = 0;
if (Mode->CursorRow < (INT32) (MaxRow - 1)) {
Mode->CursorRow++;
}
}
break;
};
}
if (Warning) {
return EFI_WARN_UNKNOWN_GLYPH;
}
return EFI_SUCCESS;
OutputError:
REPORT_STATUS_CODE_WITH_DEVICE_PATH (
EFI_ERROR_CODE | EFI_ERROR_MINOR,
(EFI_PERIPHERAL_REMOTE_CONSOLE | EFI_P_EC_OUTPUT_ERROR),
TerminalDevice->DevicePath
);
return EFI_DEVICE_ERROR;
}
/**
Implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.TestString().
If one of the characters in the *Wstring is
neither valid Unicode drawing characters,
not ASCII code, then this function will return
EFI_UNSUPPORTED.
@param This Indicates the calling context.
@param WString The Null-terminated Unicode string to be tested.
@retval EFI_SUCCESS The terminal is capable of rendering the output string.
@retval EFI_UNSUPPORTED Some of the characters in the Unicode string cannot be rendered.
**/
EFI_STATUS
EFIAPI
TerminalConOutTestString (
IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This,
IN CHAR16 *WString
)
{
TERMINAL_DEV *TerminalDevice;
EFI_STATUS Status;
//
// get Terminal device data structure pointer.
//
TerminalDevice = TERMINAL_CON_OUT_DEV_FROM_THIS (This);
switch (TerminalDevice->TerminalType) {
case PCANSITYPE:
case VT100TYPE:
case VT100PLUSTYPE:
case TTYTERMTYPE:
Status = AnsiTestString (TerminalDevice, WString);
break;
case VTUTF8TYPE:
Status = VTUTF8TestString (TerminalDevice, WString);
break;
default:
Status = EFI_UNSUPPORTED;
break;
}
return Status;
}
/**
Implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.QueryMode().
It returns information for an available text mode
that the terminal supports.
@param This Indicates the calling context.
@param ModeNumber The mode number to return information on.
@param Columns The returned columns of the requested mode.
@param Rows The returned rows of the requested mode.
@retval EFI_SUCCESS The requested mode information is returned.
@retval EFI_UNSUPPORTED The mode number is not valid.
**/
EFI_STATUS
EFIAPI
TerminalConOutQueryMode (
IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This,
IN UINTN ModeNumber,
OUT UINTN *Columns,
OUT UINTN *Rows
)
{
TERMINAL_DEV *TerminalDevice;
if (ModeNumber >= (UINTN) This->Mode->MaxMode) {
return EFI_UNSUPPORTED;
}
//
// Get Terminal device data structure pointer.
//
TerminalDevice = TERMINAL_CON_OUT_DEV_FROM_THIS (This);
*Columns = TerminalDevice->TerminalConsoleModeData[ModeNumber].Columns;
*Rows = TerminalDevice->TerminalConsoleModeData[ModeNumber].Rows;
return EFI_SUCCESS;
}
/**
Implements EFI_SIMPLE_TEXT_OUT.SetMode().
Set the terminal to a specified display mode.
In this driver, we only support mode 0.
@param This Indicates the calling context.
@param ModeNumber The text mode to set.
@retval EFI_SUCCESS The requested text mode is set.
@retval EFI_DEVICE_ERROR The requested text mode cannot be set
because of serial device error.
@retval EFI_UNSUPPORTED The text mode number is not valid.
**/
EFI_STATUS
EFIAPI
TerminalConOutSetMode (
IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This,
IN UINTN ModeNumber
)
{
EFI_STATUS Status;
TERMINAL_DEV *TerminalDevice;
//
// get Terminal device data structure pointer.
//
TerminalDevice = TERMINAL_CON_OUT_DEV_FROM_THIS (This);
if (ModeNumber >= (UINTN) This->Mode->MaxMode) {
return EFI_UNSUPPORTED;
}
//
// Set the current mode
//
This->Mode->Mode = (INT32) ModeNumber;
This->ClearScreen (This);
TerminalDevice->OutputEscChar = TRUE;
Status = This->OutputString (This, mSetModeString);
TerminalDevice->OutputEscChar = FALSE;
if (EFI_ERROR (Status)) {
return EFI_DEVICE_ERROR;
}
This->Mode->Mode = (INT32) ModeNumber;
Status = This->ClearScreen (This);
if (EFI_ERROR (Status)) {
return EFI_DEVICE_ERROR;
}
return EFI_SUCCESS;
}
/**
Implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.SetAttribute().
@param This Indicates the calling context.
@param Attribute The attribute to set. Only bit0..6 are valid, all other bits
are undefined and must be zero.
@retval EFI_SUCCESS The requested attribute is set.
@retval EFI_DEVICE_ERROR The requested attribute cannot be set due to serial port error.
@retval EFI_UNSUPPORTED The attribute requested is not defined by EFI spec.
**/
EFI_STATUS
EFIAPI
TerminalConOutSetAttribute (
IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This,
IN UINTN Attribute
)
{
UINT8 ForegroundControl;
UINT8 BackgroundControl;
UINT8 BrightControl;
INT32 SavedColumn;
INT32 SavedRow;
EFI_STATUS Status;
TERMINAL_DEV *TerminalDevice;
SavedColumn = 0;
SavedRow = 0;
//
// get Terminal device data structure pointer.
//
TerminalDevice = TERMINAL_CON_OUT_DEV_FROM_THIS (This);
//
// only the bit0..6 of the Attribute is valid
//
if ((Attribute | 0x7f) != 0x7f) {
return EFI_UNSUPPORTED;
}
//
// Skip outputting the command string for the same attribute
// It improves the terminal performance significantly
//
if (This->Mode->Attribute == (INT32) Attribute) {
return EFI_SUCCESS;
}
//
// convert Attribute value to terminal emulator
// understandable foreground color
//
switch (Attribute & 0x07) {
case EFI_BLACK:
ForegroundControl = 30;
break;
case EFI_BLUE:
ForegroundControl = 34;
break;
case EFI_GREEN:
ForegroundControl = 32;
break;
case EFI_CYAN:
ForegroundControl = 36;
break;
case EFI_RED:
ForegroundControl = 31;
break;
case EFI_MAGENTA:
ForegroundControl = 35;
break;
case EFI_BROWN:
ForegroundControl = 33;
break;
default:
case EFI_LIGHTGRAY:
ForegroundControl = 37;
break;
}
//
// bit4 of the Attribute indicates bright control
// of terminal emulator.
//
BrightControl = (UINT8) ((Attribute >> 3) & 1);
//
// convert Attribute value to terminal emulator
// understandable background color.
//
switch ((Attribute >> 4) & 0x07) {
case EFI_BLACK:
BackgroundControl = 40;
break;
case EFI_BLUE:
BackgroundControl = 44;
break;
case EFI_GREEN:
BackgroundControl = 42;
break;
case EFI_CYAN:
BackgroundControl = 46;
break;
case EFI_RED:
BackgroundControl = 41;
break;
case EFI_MAGENTA:
BackgroundControl = 45;
break;
case EFI_BROWN:
BackgroundControl = 43;
break;
default:
case EFI_LIGHTGRAY:
BackgroundControl = 47;
break;
}
//
// terminal emulator's control sequence to set attributes
//
mSetAttributeString[BRIGHT_CONTROL_OFFSET] = (CHAR16) ('0' + BrightControl);
mSetAttributeString[FOREGROUND_CONTROL_OFFSET + 0] = (CHAR16) ('0' + (ForegroundControl / 10));
mSetAttributeString[FOREGROUND_CONTROL_OFFSET + 1] = (CHAR16) ('0' + (ForegroundControl % 10));
mSetAttributeString[BACKGROUND_CONTROL_OFFSET + 0] = (CHAR16) ('0' + (BackgroundControl / 10));
mSetAttributeString[BACKGROUND_CONTROL_OFFSET + 1] = (CHAR16) ('0' + (BackgroundControl % 10));
//
// save current column and row
// for future scrolling back use.
//
SavedColumn = This->Mode->CursorColumn;
SavedRow = This->Mode->CursorRow;
TerminalDevice->OutputEscChar = TRUE;
Status = This->OutputString (This, mSetAttributeString);
TerminalDevice->OutputEscChar = FALSE;
if (EFI_ERROR (Status)) {
return EFI_DEVICE_ERROR;
}
//
// scroll back to saved cursor position.
//
This->Mode->CursorColumn = SavedColumn;
This->Mode->CursorRow = SavedRow;
This->Mode->Attribute = (INT32) Attribute;
return EFI_SUCCESS;
}
/**
Implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.ClearScreen().
It clears the ANSI terminal's display to the
currently selected background color.
@param This Indicates the calling context.
@retval EFI_SUCCESS The operation completed successfully.
@retval EFI_DEVICE_ERROR The terminal screen cannot be cleared due to serial port error.
@retval EFI_UNSUPPORTED The terminal is not in a valid display mode.
**/
EFI_STATUS
EFIAPI
TerminalConOutClearScreen (
IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This
)
{
EFI_STATUS Status;
TERMINAL_DEV *TerminalDevice;
TerminalDevice = TERMINAL_CON_OUT_DEV_FROM_THIS (This);
//
// control sequence for clear screen request
//
TerminalDevice->OutputEscChar = TRUE;
Status = This->OutputString (This, mClearScreenString);
TerminalDevice->OutputEscChar = FALSE;
if (EFI_ERROR (Status)) {
return EFI_DEVICE_ERROR;
}
Status = This->SetCursorPosition (This, 0, 0);
return Status;
}
/**
Implements EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL.SetCursorPosition().
@param This Indicates the calling context.
@param Column The row to set cursor to.
@param Row The column to set cursor to.
@retval EFI_SUCCESS The operation completed successfully.
@retval EFI_DEVICE_ERROR The request fails due to serial port error.
@retval EFI_UNSUPPORTED The terminal is not in a valid text mode, or the cursor position
is invalid for current mode.
**/
EFI_STATUS
EFIAPI
TerminalConOutSetCursorPosition (
IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This,
IN UINTN Column,
IN UINTN Row
)
{
EFI_SIMPLE_TEXT_OUTPUT_MODE *Mode;
UINTN MaxColumn;
UINTN MaxRow;
EFI_STATUS Status;
TERMINAL_DEV *TerminalDevice;
TerminalDevice = TERMINAL_CON_OUT_DEV_FROM_THIS (This);
//
// get current mode
//
Mode = This->Mode;
//
// get geometry of current mode
//
Status = This->QueryMode (
This,
Mode->Mode,
&MaxColumn,
&MaxRow
);
if (EFI_ERROR (Status)) {
return EFI_UNSUPPORTED;
}
if (Column >= MaxColumn || Row >= MaxRow) {
return EFI_UNSUPPORTED;
}
//
// control sequence to move the cursor
//
mSetCursorPositionString[ROW_OFFSET + 0] = (CHAR16) ('0' + ((Row + 1) / 10));
mSetCursorPositionString[ROW_OFFSET + 1] = (CHAR16) ('0' + ((Row + 1) % 10));
mSetCursorPositionString[COLUMN_OFFSET + 0] = (CHAR16) ('0' + ((Column + 1) / 10));
mSetCursorPositionString[COLUMN_OFFSET + 1] = (CHAR16) ('0' + ((Column + 1) % 10));
TerminalDevice->OutputEscChar = TRUE;
Status = This->OutputString (This, mSetCursorPositionString);
TerminalDevice->OutputEscChar = FALSE;
if (EFI_ERROR (Status)) {
return EFI_DEVICE_ERROR;
}
//
// update current cursor position
// in the Mode data structure.
//
Mode->CursorColumn = (INT32) Column;
Mode->CursorRow = (INT32) Row;
return EFI_SUCCESS;
}
/**
Implements SIMPLE_TEXT_OUTPUT.EnableCursor().
In this driver, the cursor cannot be hidden.
@param This Indicates the calling context.
@param Visible If TRUE, the cursor is set to be visible,
If FALSE, the cursor is set to be invisible.
@retval EFI_SUCCESS The request is valid.
@retval EFI_UNSUPPORTED The terminal does not support cursor hidden.
**/
EFI_STATUS
EFIAPI
TerminalConOutEnableCursor (
IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *This,
IN BOOLEAN Visible
)
{
if (!Visible) {
return EFI_UNSUPPORTED;
}
return EFI_SUCCESS;
}
/**
Detects if a Unicode char is for Box Drawing text graphics.
@param Graphic Unicode char to test.
@param PcAnsi Optional pointer to return PCANSI equivalent of
Graphic.
@param Ascii Optional pointer to return ASCII equivalent of
Graphic.
@retval TRUE If Graphic is a supported Unicode Box Drawing character.
**/
BOOLEAN
TerminalIsValidTextGraphics (
IN CHAR16 Graphic,
OUT CHAR8 *PcAnsi, OPTIONAL
OUT CHAR8 *Ascii OPTIONAL
)
{
UNICODE_TO_CHAR *Table;
if ((((Graphic & 0xff00) != 0x2500) && ((Graphic & 0xff00) != 0x2100))) {
//
// Unicode drawing code charts are all in the 0x25xx range,
// arrows are 0x21xx
//
return FALSE;
}
for (Table = UnicodeToPcAnsiOrAscii; Table->Unicode != 0x0000; Table++) {
if (Graphic == Table->Unicode) {
if (PcAnsi != NULL) {
*PcAnsi = Table->PcAnsi;
}
if (Ascii != NULL) {
*Ascii = Table->Ascii;
}
return TRUE;
}
}
return FALSE;
}
/**
Detects if a valid ASCII char.
@param Ascii An ASCII character.
@retval TRUE If it is a valid ASCII character.
@retval FALSE If it is not a valid ASCII character.
**/
BOOLEAN
TerminalIsValidAscii (
IN CHAR16 Ascii
)
{
//
// valid ascii code lies in the extent of 0x20 ~ 0x7f
//
if ((Ascii >= 0x20) && (Ascii <= 0x7f)) {
return TRUE;
}
return FALSE;
}
/**
Detects if a valid EFI control character.
@param CharC An input EFI Control character.
@retval TRUE If it is a valid EFI control character.
@retval FALSE If it is not a valid EFI control character.
**/
BOOLEAN
TerminalIsValidEfiCntlChar (
IN CHAR16 CharC
)
{
//
// only support four control characters.
//
if (CharC == CHAR_NULL ||
CharC == CHAR_BACKSPACE ||
CharC == CHAR_LINEFEED ||
CharC == CHAR_CARRIAGE_RETURN ||
CharC == CHAR_TAB
) {
return TRUE;
}
return FALSE;
}