audk/ShellPkg/Library/UefiShellDebug1CommandsLib/EditInputBar.c

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/** @file
Implements inputbar interface functions.
Copyright (c) 2005 - 2014, 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 "EditInputBar.h"
#include "UefiShellDebug1CommandsLib.h"
CHAR16 *mPrompt; // Input bar mPrompt string.
CHAR16 *mReturnString; // The returned string.
UINTN StringSize; // Size of mReturnString space size.
/**
Initialize the input bar.
**/
VOID
EFIAPI
InputBarInit (
VOID
)
{
mPrompt = NULL;
mReturnString = NULL;
StringSize = 0;
}
/**
Cleanup function for input bar.
**/
VOID
EFIAPI
InputBarCleanup (
VOID
)
{
//
// free input bar's prompt and input string
//
SHELL_FREE_NON_NULL (mPrompt);
SHELL_FREE_NON_NULL (mReturnString);
mPrompt = NULL;
mReturnString = NULL;
}
/**
Display the prompt.
Do the requesting of input.
@param[in] LastColumn The last printable column.
@param[in] LastRow The last printable row.
**/
VOID
EFIAPI
InputBarPrintInput (
IN UINTN LastColumn,
IN UINTN LastRow
)
{
UINTN Limit;
UINTN Size;
CHAR16 *Buffer;
UINTN Index;
UINTN mPromptLen;
mPromptLen = StrLen (mPrompt);
Limit = LastColumn - mPromptLen - 1;
Size = StrLen (mReturnString);
//
// check whether the mPrompt length and input length will
// exceed limit
//
if (Size <= Limit) {
Buffer = mReturnString;
} else {
Buffer = mReturnString + Size - Limit;
}
gST->ConOut->EnableCursor (gST->ConOut, FALSE);
ShellPrintEx (((INT32)mPromptLen), ((INT32)LastRow) - 1, L"%s", Buffer);
Size = StrLen (Buffer);
//
// print " " after mPrompt
//
for (Index = Size; Index < Limit; Index++) {
ShellPrintEx ((INT32)(mPromptLen + Size), ((INT32)LastRow) - 1, L" ");
}
gST->ConOut->EnableCursor (gST->ConOut, TRUE);
gST->ConOut->SetCursorPosition (gST->ConOut, Size + mPromptLen, LastRow - 1);
}
typedef struct {
UINT32 Foreground : 4;
UINT32 Background : 3;
} INPUT_BAR_COLOR_ATTRIBUTES;
typedef union {
INPUT_BAR_COLOR_ATTRIBUTES Colors;
UINTN Data;
} INPUT_BAR_COLOR_UNION;
/**
The refresh function for InputBar, it will wait for user input
@param[in] LastRow The last printable row.
@param[in] LastColumn The last printable column.
@retval EFI_SUCCESS The operation was successful.
**/
EFI_STATUS
EFIAPI
InputBarRefresh (
UINTN LastRow,
UINTN LastColumn
)
{
INPUT_BAR_COLOR_UNION Orig;
INPUT_BAR_COLOR_UNION New;
EFI_INPUT_KEY Key;
UINTN Size;
EFI_STATUS Status;
BOOLEAN NoDisplay;
UINTN EventIndex;
UINTN CursorRow;
UINTN CursorCol;
//
// variable initialization
//
Size = 0;
Status = EFI_SUCCESS;
//
// back up the old screen attributes
//
CursorCol = gST->ConOut->Mode->CursorColumn;
CursorRow = gST->ConOut->Mode->CursorRow;
Orig.Data = gST->ConOut->Mode->Attribute;
New.Data = 0;
New.Colors.Foreground = Orig.Colors.Background & 0xF;
New.Colors.Background = Orig.Colors.Foreground & 0x7;
gST->ConOut->SetAttribute (gST->ConOut, New.Data & 0x7F);
//
// clear input bar
//
EditorClearLine (LastRow , LastColumn, LastRow);
gST->ConOut->SetCursorPosition (gST->ConOut, 0, LastRow - 1);
ShellPrintHiiEx(-1, -1, NULL, STRING_TOKEN(STR_EDIT_LIBINPUTBAR_MAININPUTBAR), gShellDebug1HiiHandle, mPrompt);
//
// this is a selection mPrompt, cursor will stay in edit area
// actually this is for search , search/replace
//
if (StrStr (mPrompt, L"Yes/No")) {
NoDisplay = TRUE;
gST->ConOut->SetCursorPosition (gST->ConOut, CursorCol, CursorRow);
gST->ConOut->SetAttribute (gST->ConOut, Orig.Data);
} else {
NoDisplay = FALSE;
}
//
// wait for user input
//
for (;;) {
gBS->WaitForEvent (1, &gST->ConIn->WaitForKey, &EventIndex);
Status = gST->ConIn->ReadKeyStroke (gST->ConIn, &Key);
if (EFI_ERROR (Status)) {
continue;
}
//
// pressed ESC
//
if (Key.ScanCode == SCAN_ESC) {
Size = 0;
Status = EFI_NOT_READY;
break;
}
//
// return pressed
//
if (Key.UnicodeChar == CHAR_LINEFEED || Key.UnicodeChar == CHAR_CARRIAGE_RETURN) {
break;
} else if (Key.UnicodeChar == CHAR_BACKSPACE) {
//
// backspace
//
if (Size > 0) {
Size--;
mReturnString[Size] = CHAR_NULL;
if (!NoDisplay) {
InputBarPrintInput (LastColumn, LastRow);
}
}
} else if (Key.UnicodeChar <= 127 && Key.UnicodeChar >= 32) {
//
// VALID ASCII char pressed
//
mReturnString[Size] = Key.UnicodeChar;
//
// should be less than specified length
//
if (Size >= StringSize) {
continue;
}
Size++;
mReturnString[Size] = CHAR_NULL;
if (!NoDisplay) {
InputBarPrintInput (LastColumn, LastRow);
} else {
//
// if just choose yes/no
//
break;
}
}
}
mReturnString[Size] = CHAR_NULL;
//
// restore screen attributes
//
gST->ConOut->SetCursorPosition (gST->ConOut, CursorCol, CursorRow);
gST->ConOut->SetAttribute (gST->ConOut, Orig.Data);
return Status;
}
/**
SetPrompt and wait for input.
@param[in] Str The prompt string.
@retval EFI_SUCCESS The operation was successful.
@retval EFI_OUT_OF_RESOURCES A memory allocation failed.
**/
EFI_STATUS
EFIAPI
InputBarSetPrompt (
IN CONST CHAR16 *Str
)
{
//
// FREE the old mPrompt string
//
SHELL_FREE_NON_NULL (mPrompt);
mPrompt = CatSPrint (NULL, L"%s ", Str);
if (mPrompt == NULL) {
return EFI_OUT_OF_RESOURCES;
}
return EFI_SUCCESS;
}
/**
Set the size of the string in characters.
@param[in] Size The max number of characters to accept.
@retval EFI_SUCCESS The operation was successful.
@retval EFI_OUT_OF_RESOURCES A memory allocation failed.
**/
EFI_STATUS
EFIAPI
InputBarSetStringSize (
UINTN Size
)
{
//
// free the old ReturnStirng
//
SHELL_FREE_NON_NULL (mReturnString);
StringSize = Size;
mReturnString = AllocateZeroPool ((StringSize + 1) * sizeof(mReturnString[0]));
if (mReturnString == NULL) {
return EFI_OUT_OF_RESOURCES;
}
return EFI_SUCCESS;
}
/**
Function to retrieve the input from the user.
@retval NULL No input has been received.
@return The string that was input.
**/
CONST CHAR16*
EFIAPI
InputBarGetString (
VOID
)
{
return (mReturnString);
}