441 lines
14 KiB
C
441 lines
14 KiB
C
/******************************************************************************
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*
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* Module Name: acgetline - local line editing
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2014, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include "acpi.h"
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#include "accommon.h"
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#include "amlcode.h"
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#include "acparser.h"
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#include "acdebug.h"
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#include <stdio.h>
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/*
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* This is an os-independent implementation of line-editing services needed
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* by the AcpiExec utility. It uses getchar() and putchar() and the existing
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* history support provided by the AML debugger. It assumes that the terminal
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* is in the correct line-editing mode such as raw and noecho. The OSL
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* interface AcpiOsInitialize should do this. AcpiOsTerminate should put the
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* terminal back into the original mode.
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*/
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#define _COMPONENT ACPI_OS_SERVICES
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ACPI_MODULE_NAME ("acgetline")
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/* Local prototypes */
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static void
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AcpiAcClearLine (
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UINT32 EndOfLine,
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UINT32 CursorPosition);
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/* Various ASCII constants */
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#define _ASCII_NUL 0
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#define _ASCII_BACKSPACE 0x08
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#define _ASCII_TAB 0x09
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#define _ASCII_ESCAPE 0x1B
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#define _ASCII_SPACE 0x20
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#define _ASCII_LEFT_BRACKET 0x5B
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#define _ASCII_DEL 0x7F
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#define _ASCII_UP_ARROW 'A'
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#define _ASCII_DOWN_ARROW 'B'
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#define _ASCII_RIGHT_ARROW 'C'
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#define _ASCII_LEFT_ARROW 'D'
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#define _ASCII_NEWLINE '\n'
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extern UINT32 AcpiGbl_NextCmdNum;
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/* Erase a single character on the input command line */
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#define ACPI_CLEAR_CHAR() \
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putchar (_ASCII_BACKSPACE); \
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putchar (_ASCII_SPACE); \
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putchar (_ASCII_BACKSPACE);
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/* Backup cursor by Count positions */
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#define ACPI_BACKUP_CURSOR(i, Count) \
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for (i = 0; i < (Count); i++) \
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{putchar (_ASCII_BACKSPACE);}
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/******************************************************************************
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*
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* FUNCTION: AcpiAcClearLine
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*
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* PARAMETERS: EndOfLine - Current end-of-line index
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* CursorPosition - Current cursor position within line
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*
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* RETURN: None
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*
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* DESCRIPTION: Clear the entire command line the hard way, but probably the
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* most portable.
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*
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*****************************************************************************/
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static void
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AcpiAcClearLine (
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UINT32 EndOfLine,
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UINT32 CursorPosition)
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{
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UINT32 i;
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if (CursorPosition < EndOfLine)
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{
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/* Clear line from current position to end of line */
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for (i = 0; i < (EndOfLine - CursorPosition); i++)
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{
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putchar (' ');
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}
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}
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/* Clear the entire line */
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for (; EndOfLine > 0; EndOfLine--)
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{
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ACPI_CLEAR_CHAR ();
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}
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}
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/******************************************************************************
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*
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* FUNCTION: AcpiOsGetLine
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*
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* PARAMETERS: Buffer - Where to return the command line
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* BufferLength - Maximum length of Buffer
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* BytesRead - Where the actual byte count is returned
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*
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* RETURN: Status and actual bytes read
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*
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* DESCRIPTION: Get the next input line from the terminal. NOTE: terminal
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* is expected to be in a mode that supports line-editing (raw,
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* noecho). This function is intended to be very portable. Also,
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* it uses the history support implemented in the AML debugger.
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*
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*****************************************************************************/
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ACPI_STATUS
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AcpiOsGetLine (
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char *Buffer,
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UINT32 BufferLength,
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UINT32 *BytesRead)
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{
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char *NextCommand;
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UINT32 MaxCommandIndex = AcpiGbl_NextCmdNum - 1;
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UINT32 CurrentCommandIndex = MaxCommandIndex;
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UINT32 PreviousCommandIndex = MaxCommandIndex;
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int InputChar;
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UINT32 CursorPosition = 0;
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UINT32 EndOfLine = 0;
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UINT32 i;
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/* Always clear the line buffer before we read a new line */
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memset (Buffer, 0, BufferLength);
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/*
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* This loop gets one character at a time (except for esc sequences)
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* until a newline or error is detected.
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*
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* Note: Don't attempt to write terminal control ESC sequences, even
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* though it makes certain things more difficult.
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*/
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while (1)
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{
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if (EndOfLine >= (BufferLength - 1))
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{
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return (AE_BUFFER_OVERFLOW);
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}
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InputChar = getchar ();
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switch (InputChar)
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{
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default: /* This is the normal character case */
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/* Echo the character (at EOL) and copy it to the line buffer */
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if (EndOfLine == CursorPosition)
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{
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putchar (InputChar);
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Buffer[EndOfLine] = (char) InputChar;
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EndOfLine++;
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CursorPosition++;
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Buffer[EndOfLine] = 0;
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continue;
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}
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/* Insert character into the middle of the buffer */
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memmove (&Buffer[CursorPosition + 1], &Buffer[CursorPosition],
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(EndOfLine - CursorPosition + 1));
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Buffer [CursorPosition] = (char) InputChar;
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Buffer [EndOfLine + 1] = 0;
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/* Display the new part of line starting at the new character */
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fprintf (stdout, "%s", &Buffer[CursorPosition]);
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/* Restore cursor */
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ACPI_BACKUP_CURSOR (i, EndOfLine - CursorPosition);
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CursorPosition++;
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EndOfLine++;
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continue;
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case _ASCII_DEL: /* Backspace key */
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if (!EndOfLine) /* Any characters on the command line? */
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{
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continue;
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}
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if (EndOfLine == CursorPosition) /* Erase the final character */
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{
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ACPI_CLEAR_CHAR ();
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EndOfLine--;
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CursorPosition--;
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continue;
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}
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if (!CursorPosition) /* Do not backup beyond start of line */
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{
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continue;
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}
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/* Remove the character from the line */
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memmove (&Buffer[CursorPosition - 1], &Buffer[CursorPosition],
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(EndOfLine - CursorPosition + 1));
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/* Display the new part of line starting at the new character */
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putchar (_ASCII_BACKSPACE);
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fprintf (stdout, "%s ", &Buffer[CursorPosition - 1]);
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/* Restore cursor */
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ACPI_BACKUP_CURSOR (i, EndOfLine - CursorPosition + 1);
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EndOfLine--;
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if (CursorPosition > 0)
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{
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CursorPosition--;
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}
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continue;
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case _ASCII_NEWLINE: /* Normal exit case at end of command line */
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case _ASCII_NUL:
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/* Return the number of bytes in the command line string */
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if (BytesRead)
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{
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*BytesRead = EndOfLine;
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}
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/* Echo, terminate string buffer, and exit */
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putchar (InputChar);
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Buffer[EndOfLine] = 0;
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return (AE_OK);
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case _ASCII_TAB:
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/* Ignore */
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continue;
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case EOF:
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return (AE_ERROR);
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case _ASCII_ESCAPE:
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/* Check for escape sequences of the form "ESC[x" */
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InputChar = getchar ();
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if (InputChar != _ASCII_LEFT_BRACKET)
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{
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continue; /* Ignore this ESC, does not have the '[' */
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}
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/* Get the code following the ESC [ */
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InputChar = getchar (); /* Backup one character */
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switch (InputChar)
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{
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case _ASCII_LEFT_ARROW:
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if (CursorPosition > 0)
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{
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putchar (_ASCII_BACKSPACE);
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CursorPosition--;
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}
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continue;
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case _ASCII_RIGHT_ARROW:
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/*
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* Move one character forward. Do this without sending
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* ESC sequence to the terminal for max portability.
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*/
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if (CursorPosition < EndOfLine)
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{
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/* Backup to start of line and print the entire line */
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ACPI_BACKUP_CURSOR (i, CursorPosition);
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fprintf (stdout, "%s", Buffer);
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/* Backup to where the cursor should be */
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CursorPosition++;
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ACPI_BACKUP_CURSOR (i, EndOfLine - CursorPosition);
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}
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continue;
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case _ASCII_UP_ARROW:
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/* If no commands available or at start of history list, ignore */
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if (!CurrentCommandIndex)
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{
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continue;
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}
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/* Manage our up/down progress */
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if (CurrentCommandIndex > PreviousCommandIndex)
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{
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CurrentCommandIndex = PreviousCommandIndex;
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}
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/* Get the historical command from the debugger */
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NextCommand = AcpiDbGetHistoryByIndex (CurrentCommandIndex);
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if (!NextCommand)
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{
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return (AE_ERROR);
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}
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/* Make this the active command and echo it */
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AcpiAcClearLine (EndOfLine, CursorPosition);
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strcpy (Buffer, NextCommand);
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fprintf (stdout, "%s", Buffer);
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EndOfLine = CursorPosition = strlen (Buffer);
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PreviousCommandIndex = CurrentCommandIndex;
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CurrentCommandIndex--;
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continue;
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case _ASCII_DOWN_ARROW:
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if (!MaxCommandIndex) /* Any commands available? */
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{
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continue;
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}
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/* Manage our up/down progress */
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if (CurrentCommandIndex < PreviousCommandIndex)
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{
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CurrentCommandIndex = PreviousCommandIndex;
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}
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/* If we are the end of the history list, output a clear new line */
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if ((CurrentCommandIndex + 1) > MaxCommandIndex)
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{
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AcpiAcClearLine (EndOfLine, CursorPosition);
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EndOfLine = CursorPosition = 0;
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PreviousCommandIndex = CurrentCommandIndex;
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continue;
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}
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PreviousCommandIndex = CurrentCommandIndex;
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CurrentCommandIndex++;
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/* Get the historical command from the debugger */
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NextCommand = AcpiDbGetHistoryByIndex (CurrentCommandIndex);
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if (!NextCommand)
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{
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return (AE_ERROR);
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}
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/* Make this the active command and echo it */
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AcpiAcClearLine (EndOfLine, CursorPosition);
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strcpy (Buffer, NextCommand);
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fprintf (stdout, "%s", Buffer);
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EndOfLine = CursorPosition = strlen (Buffer);
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continue;
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case 0x31:
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case 0x32:
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case 0x33:
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case 0x34:
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case 0x35:
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case 0x36:
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/*
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* Ignore the various keys like insert/delete/home/end, etc.
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* But we must eat the final character of the ESC sequence.
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*/
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InputChar = getchar ();
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continue;
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default:
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/* Ignore random escape sequences that we don't care about */
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continue;
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}
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continue;
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}
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}
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}
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