static void
AcpiAcClearLine (
UINT32 EndOfLine,
UINT32 CursorPosition)
{
UINT32 i;
if (CursorPosition < EndOfLine)
{
/* Clear line from current position to end of line */
for (i = 0; i < (EndOfLine - CursorPosition); i++)
{
putchar (' ');
}
}
/* Clear the entire line */
for (; EndOfLine > 0; EndOfLine--)
{
ACPI_CLEAR_CHAR ();
}
}
ACPI_STATUS
AcpiOsGetLine (
char *Buffer,
UINT32 BufferLength,
UINT32 *BytesRead)
{
char *NextCommand;
UINT32 MaxCommandIndex = AcpiGbl_NextCmdNum - 1;
UINT32 CurrentCommandIndex = MaxCommandIndex;
UINT32 PreviousCommandIndex = MaxCommandIndex;
int InputChar;
UINT32 CursorPosition = 0;
UINT32 EndOfLine = 0;
UINT32 i;
/* Always clear the line buffer before we read a new line */
memset (Buffer, 0, BufferLength);
/*
* This loop gets one character at a time (except for esc sequences)
* until a newline or error is detected.
*
* Note: Don't attempt to write terminal control ESC sequences, even
* though it makes certain things more difficult.
*/
while (1)
{
if (EndOfLine >= (BufferLength - 1))
{
return (AE_BUFFER_OVERFLOW);
}
InputChar = getchar ();
switch (InputChar)
{
default: /* This is the normal character case */
/* Echo the character (at EOL) and copy it to the line buffer */
if (EndOfLine == CursorPosition)
{
putchar (InputChar);
Buffer[EndOfLine] = (char) InputChar;
EndOfLine++;
CursorPosition++;
Buffer[EndOfLine] = 0;
continue;
}
/* Insert character into the middle of the buffer */
memmove (&Buffer[CursorPosition + 1], &Buffer[CursorPosition],
(EndOfLine - CursorPosition + 1));
Buffer [CursorPosition] = (char) InputChar;
Buffer [EndOfLine + 1] = 0;
/* Display the new part of line starting at the new character */
fprintf (stdout, "%s", &Buffer[CursorPosition]);
/* Restore cursor */
ACPI_BACKUP_CURSOR (i, EndOfLine - CursorPosition);
CursorPosition++;
EndOfLine++;
continue;
case _ASCII_DEL: /* Backspace key */
if (!EndOfLine) /* Any characters on the command line? */
{
continue;
}
if (EndOfLine == CursorPosition) /* Erase the final character */
{
ACPI_CLEAR_CHAR ();
EndOfLine--;
CursorPosition--;
continue;
}
if (!CursorPosition) /* Do not backup beyond start of line */
{
continue;
}
/* Remove the character from the line */
memmove (&Buffer[CursorPosition - 1], &Buffer[CursorPosition],
(EndOfLine - CursorPosition + 1));
/* Display the new part of line starting at the new character */
putchar (_ASCII_BACKSPACE);
fprintf (stdout, "%s ", &Buffer[CursorPosition - 1]);
/* Restore cursor */
ACPI_BACKUP_CURSOR (i, EndOfLine - CursorPosition + 1);
EndOfLine--;
if (CursorPosition > 0)
{
CursorPosition--;
}
continue;
case _ASCII_NEWLINE: /* Normal exit case at end of command line */
case _ASCII_NUL:
/* Return the number of bytes in the command line string */
if (BytesRead)
{
*BytesRead = EndOfLine;
}
/* Echo, terminate string buffer, and exit */
putchar (InputChar);
Buffer[EndOfLine] = 0;
return (AE_OK);
case _ASCII_TAB:
/* Ignore */
continue;
case EOF:
return (AE_ERROR);
case _ASCII_ESCAPE:
/* Check for escape sequences of the form "ESC[x" */
InputChar = getchar ();
if (InputChar != _ASCII_LEFT_BRACKET)
{
continue; /* Ignore this ESC, does not have the '[' */
}
/* Get the code following the ESC [ */
InputChar = getchar (); /* Backup one character */
switch (InputChar)
{
case _ASCII_LEFT_ARROW:
if (CursorPosition > 0)
{
putchar (_ASCII_BACKSPACE);
CursorPosition--;
}
continue;
case _ASCII_RIGHT_ARROW:
/*
* Move one character forward. Do this without sending
* ESC sequence to the terminal for max portability.
*/
if (CursorPosition < EndOfLine)
{
/* Backup to start of line and print the entire line */
ACPI_BACKUP_CURSOR (i, CursorPosition);
fprintf (stdout, "%s", Buffer);
/* Backup to where the cursor should be */
CursorPosition++;
ACPI_BACKUP_CURSOR (i, EndOfLine - CursorPosition);
}
continue;
case _ASCII_UP_ARROW:
/* If no commands available or at start of history list, ignore */
if (!CurrentCommandIndex)
{
continue;
}
/* Manage our up/down progress */
if (CurrentCommandIndex > PreviousCommandIndex)
{
CurrentCommandIndex = PreviousCommandIndex;
}
/* Get the historical command from the debugger */
NextCommand = AcpiDbGetHistoryByIndex (CurrentCommandIndex);
if (!NextCommand)
{
return (AE_ERROR);
}
/* Make this the active command and echo it */
AcpiAcClearLine (EndOfLine, CursorPosition);
strcpy (Buffer, NextCommand);
fprintf (stdout, "%s", Buffer);
EndOfLine = CursorPosition = strlen (Buffer);
PreviousCommandIndex = CurrentCommandIndex;
CurrentCommandIndex--;
continue;
case _ASCII_DOWN_ARROW:
if (!MaxCommandIndex) /* Any commands available? */
{
continue;
}
/* Manage our up/down progress */
if (CurrentCommandIndex < PreviousCommandIndex)
{
CurrentCommandIndex = PreviousCommandIndex;
}
/* If we are the end of the history list, output a clear new line */
if ((CurrentCommandIndex + 1) > MaxCommandIndex)
{
AcpiAcClearLine (EndOfLine, CursorPosition);
EndOfLine = CursorPosition = 0;
PreviousCommandIndex = CurrentCommandIndex;
continue;
}
PreviousCommandIndex = CurrentCommandIndex;
CurrentCommandIndex++;
/* Get the historical command from the debugger */
NextCommand = AcpiDbGetHistoryByIndex (CurrentCommandIndex);
if (!NextCommand)
{
return (AE_ERROR);
}
/* Make this the active command and echo it */
AcpiAcClearLine (EndOfLine, CursorPosition);
strcpy (Buffer, NextCommand);
fprintf (stdout, "%s", Buffer);
EndOfLine = CursorPosition = strlen (Buffer);
continue;
case 0x31:
case 0x32:
case 0x33:
case 0x34:
case 0x35:
case 0x36:
/*
* Ignore the various keys like insert/delete/home/end, etc.
* But we must eat the final character of the ESC sequence.
*/
InputChar = getchar ();
continue;
default:
/* Ignore random escape sequences that we don't care about */
continue;
}
continue;
}
}
}
