/*= Backspace ================================================================
Purpose: Performs a backspace operation on the command line
Inputs: none
Returns: none
============================================================================*/
static void Backspace(void)
{
UINT8 num_chars;
UINT8 orig_index = GET_CURSOR();
/* if cursor is not at the left-most position */
if (GET_CURSOR() != gCmdLinePromptLength)
{
/* Null out tmp cmd line */
memset(gTmpCmdLine, 0x00, sizeof(gTmpCmdLine));
/* get characters before the backspace */
num_chars = GET_CURSOR() - gCmdLinePromptLength - 1;
strncpy( (char *) gTmpCmdLine, (const char *) g_ConsoleContext.rxBuf, num_chars);
/* append characters after the deleted char (if there are any) */
if ( (GET_LEN_RX_CMD_STRING() - 1) > 0u)
{
strcpy( (char *) &gTmpCmdLine[num_chars], (const char *) &g_ConsoleContext.rxBuf[num_chars + 1]);
}
EraseEntireLine(); /* leaves g_ConsoleContext.cursorIndex at 0 */
strcpy( (char *) g_ConsoleContext.rxBuf, (const char *) gTmpCmdLine);
putrsUART( (ROM FAR char *) gCmdLinePrompt);
putsUART( (char *) g_ConsoleContext.rxBuf);
SET_CURSOR(gCmdLinePromptLength + GET_LEN_RX_CMD_STRING());
CursorHome(); /* to first character after prompt */
/* move cursor to point of backspace */
CursorRight_N(orig_index - 1 - gCmdLinePromptLength);
}
}
static void Delete(void)
{
unsigned int num_chars;
unsigned int orig_index = GET_CURSOR();
/* if cursor is not at the end of the line */
if (GET_CURSOR() != GET_LEN_RX_CMD_STRING() + gCmdLinePromptLength)
{
/* Null out tmp cmd line */
memset(gTmpCmdLine, 0x00, sizeof(gTmpCmdLine));
/* get characters before the deleted key */
num_chars = GET_CURSOR() - gCmdLinePromptLength;
strncpy( (char *) gTmpCmdLine, (const char *) g_ConsoleContext.rxBuf, num_chars);
/* append characters after the deleted char (if there are any) */
if (strlen( (char *) g_ConsoleContext.rxBuf) - 1 > 0u)
{
strcpy( (char *) &gTmpCmdLine[num_chars], (const char *) &g_ConsoleContext.rxBuf[num_chars + 1]);
}
EraseEntireLine(); /* leaves g_ConsoleContext.cursorIndex at 0 */
putrsUART( (ROM FAR char *) gCmdLinePrompt);
strcpy( (char *) g_ConsoleContext.rxBuf, (const char *) gTmpCmdLine);
putsUART( (char *) g_ConsoleContext.rxBuf );
SET_CURSOR(gCmdLinePromptLength + GET_LEN_RX_CMD_STRING());
CursorHome(); /* to first character after prompt */
/* move cursor to point of delete */
CursorRight_N(orig_index - gCmdLinePromptLength);
}
}
/*****************************************************************************
* FUNCTION: DisplayHistoryEntry
*
* RETURNS: None
*
* PARAMS: action -- PREV_HISTORY or NEXT_HISTORY
*
* NOTES: In response to the user pressing up or down arrow key, display
* corresponding entry in history buffer.
*
*****************************************************************************/
static void DisplayHistoryEntry(UINT8 action)
{
BOOL foundEntry = FALSE;
// if nothing in history buffer
if (history.seeded == FALSE)
{
return;
}
if (action == (UINT8)kWFPrevHistory)
{
--history.recallIndex;
if (history.recallIndex < 0)
{
history.recallIndex = kWFNumHistoryEntries - 1;
}
/* search until found a history entry or searched all entries */
while (foundEntry == FALSE)
{
/* if found a history entry */
if (history.buf[history.recallIndex][0] != 0)
{
foundEntry = TRUE;
}
else
{
--history.recallIndex;
if (history.recallIndex < 0)
{
history.recallIndex = kWFNumHistoryEntries - 1;
}
}
}
}
else /* action == kWFNextHistory */
{
history.recallIndex = (history.recallIndex + 1) % kWFNumHistoryEntries;
/* search until found a history entry or searched all entries */
while (foundEntry == FALSE)
{
/* if found a history entry */
if (history.buf[history.recallIndex][0] != 0)
{
foundEntry = TRUE;
}
else
{
history.recallIndex = (history.recallIndex + 1) % kWFNumHistoryEntries;
}
}
}
if (foundEntry)
{
// erase line on screen and output command from history
EraseEntireLine(); /* leaves Cursor_Index at 0 */
putrsUART( (ROM FAR char *) gCmdLinePrompt );
putsUART( (char *) history.buf[history.recallIndex]);
// copy history command to console buffer (so they match) and put cursor
// at end of line
memset(g_ConsoleContext.rxBuf, 0x00, GET_LEN_RX_CMD_STRING() );
strcpy( (char *) g_ConsoleContext.rxBuf, (const char *) history.buf[history.recallIndex]);
SET_CURSOR(gCmdLinePromptLength + strlen( (char *) history.buf[history.recallIndex]));
}
}
/*= InsertCharacter =========================================================
Purpose: Inserts and echoes an printable character into the command line at the
cursor location.
Inputs: c -- char to insert
Returns: none
============================================================================*/
static void InsertCharacter(INT8 c)
{
UINT8 len;
UINT8 i;
UINT8 orig_cursor_index = GET_CURSOR();
UINT8 count;
/* throw away characters if exceeded cmd line length */
if (GET_LEN_RX_CMD_STRING() >= sizeof(g_ConsoleContext.rxBuf)-1)
{
return;
}
len = GET_LEN_RX_CMD_STRING() + gCmdLinePromptLength;
/* if inserting a character at end of cmd line */
if (GET_CURSOR() == len)
{
g_ConsoleContext.rxBuf[GET_CURSOR() - gCmdLinePromptLength] = c;
SET_CURSOR(GET_CURSOR() + 1);
EchoCharacter(c);
}
/* inserting a character somewhere before the end of command line */
else
{
/* Null out tmp cmd line */
memset(gTmpCmdLine, 0x00, sizeof(gTmpCmdLine));
/* copy up to the point of insertion */
strncpy( (char *) gTmpCmdLine, (const char *) g_ConsoleContext.rxBuf, GET_CURSOR() - gCmdLinePromptLength);
/* insert the new character */
gTmpCmdLine[GET_CURSOR() - gCmdLinePromptLength] = c;
/* copy the chars after the new character */
strncpy( (char *) &gTmpCmdLine[GET_CURSOR() - gCmdLinePromptLength + 1],
(const char *) &g_ConsoleContext.rxBuf[GET_CURSOR() - gCmdLinePromptLength],
len - GET_CURSOR());
/* put the first part of new string in the cmd line buffer */
strcpy( (char *) g_ConsoleContext.rxBuf, (const char *) gTmpCmdLine);
/* erase entire line, put the cursor at index 0 */
EraseEntireLine();
/* output the prompt */
putrsUART( (ROM FAR char *) gCmdLinePrompt);
/* Output the updated command line */
putsUART( (char *) &g_ConsoleContext.rxBuf[0]);
/* move the cursor to the next insert location */
count = (len + 1) - orig_cursor_index - 1;
for (i = 0; i < count; ++i)
{
putrsUART( (ROM FAR char *) cursorLeftEscapeSequence);
}
SET_CURSOR(orig_cursor_index + 1);
}
}
/*****************************************************************************
* FUNCTION: DisplayHistoryEntry
*
* RETURNS: None
*
* PARAMS: action -- PREV_HISTORY or NEXT_HISTORY
*
* NOTES: In response to the user pressing up or down arrow key, display
* corresponding entry in history buffer.
*
*****************************************************************************/
static void DisplayHistoryEntry(uint8_t action)
{
bool foundEntry = false;
// if nothing in history buffer
if (history.seeded == false)
{
return;
}
if (action == (uint8_t)kPrevHistory)
{
--history.recallIndex;
if (history.recallIndex < 0)
{
history.recallIndex = kNumHistoryEntries - 1;
}
/* search until found a history entry or searched all entries */
while (foundEntry == false)
{
/* if found a history entry */
if (history.buf[history.recallIndex][0] != 0)
{
foundEntry = true;
}
else
{
--history.recallIndex;
if (history.recallIndex < 0)
{
history.recallIndex = kNumHistoryEntries - 1;
}
}
}
}
else /* action == kNextHistory */
{
history.recallIndex = (history.recallIndex + 1) % kNumHistoryEntries;
/* search until found a history entry or searched all entries */
while (foundEntry == false)
{
/* if found a history entry */
if (history.buf[history.recallIndex][0] != 0)
{
foundEntry = true;
}
else
{
history.recallIndex = (history.recallIndex + 1) % kNumHistoryEntries;
}
}
}
if (foundEntry)
{
// erase line on screen and output command from history
EraseEntireLine(); /* leaves Cursor_Index at 0 */
SYS_CONSOLE_MESSAGE(gCmdLinePrompt );
SYS_CONSOLE_MESSAGE(history.buf[history.recallIndex]);
// copy history command to console buffer (so they match) and put cursor
// at end of line
memset(g_ConsoleContext.rxBuf, 0x00, GET_LEN_RX_CMD_STRING() );
strcpy( (char *) g_ConsoleContext.rxBuf, (const char *) history.buf[history.recallIndex]);
SET_CURSOR(gCmdLinePromptLength + strlen( (char *) history.buf[history.recallIndex]));
}
}
