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1bb4167211
This one was more subtle because the prompt (KdIoReadLine) functionality makes a call-back to KDBG own command history getter function KdbGetHistoryEntry. It is planned for this to become a registered optional callback pointer.
137 lines
3.5 KiB
C
137 lines
3.5 KiB
C
/*
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* PROJECT: ReactOS KDBG Kernel Debugger Terminal Driver
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* LICENSE: GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
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* PURPOSE: Terminal line-editing (Prompt) interface
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* COPYRIGHT: Copyright 2001-2004 David Welch <welch@cwcom.net>
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* Copyright 2004-2005 Gregor Anich <blight@blight.eu.org>
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* Copyright 2022-2023 Hermès Bélusca-Maïto <hermes.belusca-maito@reactos.org>
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*/
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/* INCLUDES ******************************************************************/
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#include <ntoskrnl.h>
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#include "kd.h"
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#include "kdterminal.h"
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/* In kdb.h only when KDBG defined */
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#ifdef KDBG
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extern PCSTR
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KdbGetHistoryEntry(
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_Inout_ PLONG NextIndex,
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_In_ BOOLEAN Next);
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#else
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PCSTR
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KdbGetHistoryEntry(
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_Inout_ PLONG NextIndex,
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_In_ BOOLEAN Next)
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{
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/* Dummy function */
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return NULL;
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}
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#endif
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/* FUNCTIONS *****************************************************************/
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/**
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* @brief Reads a line of user input from the terminal.
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*
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* @param[out] Buffer
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* Buffer where to store the input. Trailing newlines are removed.
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*
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* @param[in] Size
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* Size of @p Buffer.
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*
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* @return
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* Returns the number of characters stored, not counting the NULL terminator.
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*
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* @note Accepts only \n newlines, \r is ignored.
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**/
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SIZE_T
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KdIoReadLine(
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_Out_ PCHAR Buffer,
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_In_ SIZE_T Size)
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{
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PCHAR Orig = Buffer;
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ULONG ScanCode = 0;
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CHAR Key;
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BOOLEAN EchoOn = !(KdbDebugState & KD_DEBUG_KDNOECHO);
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LONG CmdHistIndex = -1; // Start at end of history.
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/* Flush the input buffer */
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KdpFlushTerminalInput();
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/* Bail out if the buffer is zero-sized */
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if (Size == 0)
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return 0;
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for (;;)
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{
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Key = KdpReadTermKey(&ScanCode);
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/* Check for return or newline */
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if ((Key == '\r') || (Key == '\n'))
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{
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*Buffer = ANSI_NULL;
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KdIoPuts("\n");
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return (SIZE_T)(Buffer - Orig);
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}
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else if (Key == KEY_BS || Key == KEY_DEL)
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{
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/* Erase the last character */
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if (Buffer > Orig)
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{
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Buffer--;
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*Buffer = ANSI_NULL;
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if (EchoOn)
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KdIoPrintf("%c %c", KEY_BS, KEY_BS);
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else
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KdIoPrintf(" %c", KEY_BS);
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}
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}
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else if (ScanCode == KEY_SCAN_UP || ScanCode == KEY_SCAN_DOWN)
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{
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PCSTR CmdHistory = KdbGetHistoryEntry(&CmdHistIndex,
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(ScanCode == KEY_SCAN_DOWN));
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if (CmdHistory)
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{
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SIZE_T i;
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/* Erase the whole line */
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while (Buffer > Orig)
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{
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Buffer--;
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*Buffer = ANSI_NULL;
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if (EchoOn)
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KdIoPrintf("%c %c", KEY_BS, KEY_BS);
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else
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KdIoPrintf(" %c", KEY_BS);
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}
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/* Copy and display the history entry */
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i = min(strlen(CmdHistory), Size - 1);
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memcpy(Orig, CmdHistory, i);
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Orig[i] = ANSI_NULL;
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Buffer = Orig + i;
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KdIoPuts(Orig);
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}
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}
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else
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{
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/* Do not accept characters anymore if the buffer is full */
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if ((SIZE_T)(Buffer - Orig) >= (Size - 1))
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continue;
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if (EchoOn)
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KdIoPrintf("%c", Key);
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*Buffer = Key;
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Buffer++;
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}
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}
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}
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/* EOF */
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