shellmatta/src/shellmatta.c

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/*
* Copyright (c) 2019 Stefan Strobel <stefan.strobel@shimatta.net>
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
/**
* @file shellmatta.c
* @brief Main implementation of the Shellmatta terminal implementation
* @author Stefan Strobel <stefan.strobel@shimatta.net>
*/
/**
* @addtogroup shellmatta
* @{
* @addtogroup shellmatta_private
* @{
*/
#include "shellmatta.h"
#include <stdio.h>
#include <stddef.h>
#include <string.h>
#include <stdarg.h>
/* defines */
#ifndef SHELLMATTA_OUTPUT_BUFFER_SIZE
#define SHELLMATTA_OUTPUT_BUFFER_SIZE 128u
#endif
#define SHELLMATTA_MIN(a,b) (((a) > (b)) ? (b) : (a))
#define SHELLMATTA_MAX(a,b) (((a) < (b)) ? (b) : (a))
#define SHELLMATTA_PRINT_BUFFER(buffer,cnt,fct) \
while((cnt) > sizeof((buffer))) \
{ \
(cnt) -= sizeof((buffer)); \
(fct)((buffer), sizeof((buffer))); \
} \
if((cnt) != 0u) \
{ \
(fct)((buffer), (cnt)); \
}
#define SHELLMATTA_MAGIC 0x5101E110u
/* static functions */
/**
* @brief function to write an echo to the output depending on
* the echo enabled state of the instance
* @param[in] inst pointer to a shellmatta instance
* @param[in] data pointer to the data so send
* @param[in] length length of the data to send (in byte)
*/
static void writeEcho( shellmatta_instance_t *inst,
const char *data,
uint32_t length)
{
if(true == inst->echoEnabled)
{
inst->write(data, length);
}
}
/**
* @brief appends a byte to the history ring stack buffer
* @param[in] inst pointer to a shellmatta instance
* @param[in] byte byte to append to the history buffer
*/
static void appendHistoryByte(shellmatta_instance_t *inst, char byte)
{
/** -# calculate the new history buffer index */
inst->historyEnd ++;
if(inst->historyEnd >= inst->historyBufferSize)
{
inst->historyEnd = 0u;
}
/** -# append the byte */
inst->historyBuffer[inst->historyEnd] = byte;
/** -# check if the we overwrite an existing stored command */
if(inst->historyEnd == inst->historyStart)
{
/** -# move the start pointer to the next termination (0) */
do
{
inst->historyStart ++;
if(inst->historyStart >= inst->historyBufferSize)
{
inst->historyStart = 0u;
}
}while(0u != inst->historyBuffer[inst->historyStart]);
}
}
/**
* @brief reads a byte from the history buffer and decreases the read index
* @param[in] inst pointer to a shellmatta instance
* @param[out] byte pointer to a char where the read out byte will be stored
* @return
*/
static bool getHistoryByte(shellmatta_instance_t *inst, char *byte)
{
bool ret = false;
/** -# check if we have reached the end of the buffer already */
if(inst->historyRead != inst->historyStart)
{
/** -# read out one byte and decrease the read index */
*byte = inst->historyBuffer[inst->historyRead];
if(0u == inst->historyRead)
{
inst->historyRead = inst->historyBufferSize;
}
inst->historyRead --;
ret = true;
}
return ret;
}
/**
* @brief stores the current command from the instances buffer into the
* history buffer
* @param[in] inst pointer to a shellmatta instance
*/
static void storeHistoryCmd(shellmatta_instance_t *inst)
{
uint32_t i;
/** -# check if we have enough room for the command in the history buffer
* and there is a new command to be stored */
if( (inst->historyBufferSize > inst->inputCount)
&& (0u != inst->inputCount)
&& (true == inst->dirty))
{
/** -# append the command termination */
appendHistoryByte(inst, 0u);
/** -# append the command byte wise in reverse direction */
for(i = inst->inputCount; i > 0u; i --)
{
appendHistoryByte(inst, inst->buffer[i - 1u]);
}
}
/** -# remove the dirty flag - everything is nice and saved */
inst->dirty = false;
}
/**
* @brief navigates in the history buffer by the given number of commands
* @param[in] inst pointer to a shellmatta instance
* @param[in] cnt direction and count to navigate
* @return
*/
static bool navigateHistoryCmd(shellmatta_instance_t *inst, int32_t cnt)
{
bool ret = true;
uint32_t tempReadIdx = 0u;
while((cnt > 0) && (true == ret))
{
if(inst->historyRead != inst->historyEnd)
{
inst->historyRead ++;
}
while(inst->historyRead != inst->historyEnd)
{
inst->historyRead ++;
if(inst->historyRead >= inst->historyBufferSize)
{
inst->historyRead = 0u;
}
if( (inst->historyRead != inst->historyEnd)
&& (0u == inst->historyBuffer[inst->historyRead]))
{
if(0u == inst->historyRead)
{
inst->historyRead = inst->historyBufferSize;
}
inst->historyRead --;
cnt -= 1;
break;
}
}
if(inst->historyRead == inst->historyEnd)
{
ret = false;
}
}
while((cnt < 0) && (true == ret))
{
tempReadIdx = inst->historyRead;
while(inst->historyRead != inst->historyStart)
{
if(0u == inst->historyRead)
{
inst->historyRead = inst->historyBufferSize;
}
inst->historyRead --;
if( (inst->historyRead != inst->historyStart)
&& (0u == inst->historyBuffer[inst->historyRead]))
{
if(0u == inst->historyRead)
{
inst->historyRead = inst->historyBufferSize;
}
inst->historyRead --;
cnt += 1;
break;
}
}
if(inst->historyRead == inst->historyStart)
{
inst->historyRead = tempReadIdx;
inst->historyReadUp = false;
ret = false;
}
}
return ret;
}
/**
* @brief restores the command from the history buffer where the read
* index points on
* @param[in] inst pointer to a shellmatta instance
*/
static void restoreHistoryCmd(shellmatta_instance_t *inst)
{
char byte;
bool ret = true;
ret = getHistoryByte(inst, &byte);
while((ret == true) && (byte != 0u))
{
inst->buffer[inst->inputCount] = byte;
inst->inputCount ++;
inst->cursor ++;
ret = getHistoryByte(inst, &byte);
}
writeEcho(inst, inst->buffer, inst->inputCount);
navigateHistoryCmd(inst, 1);
inst->dirty = false;
}
/**
* @brief resets the history buffer pointers to show to the most recent
* command again
* @param[in] inst pointer to a shellmatta instance
*/
static void resetHistoryBuffer(shellmatta_instance_t *inst)
{
inst->historyRead = inst->historyEnd;
inst->historyReadUp = true;
}
/**
* @brief tells the terminal to save the current cursor position
* @param[in] inst pointer to shellmatta instance
*/
static void saveCursorPos(shellmatta_instance_t *inst)
{
writeEcho(inst, "\e[s", 3u);
}
/**
* @brief tells the terminal to restore the saved cursor position
* @param[in] inst pointer to shellmatta instance
*/
static void restoreCursorPos(shellmatta_instance_t *inst)
{
writeEcho(inst, "\e[u", 3u);
}
/**
* @brief tells the terminal to erase the line on the right side of the
* cursor
* @param[in] inst pointer to shellmatta instance
*/
static void eraseLine(shellmatta_instance_t *inst)
{
writeEcho(inst, "\e[K", 3u);
}
/**
* @brief moves the cursor back by the given amoung of characters
* @param[in] inst pointer to shellmatta instance
* @param[in] length number of characters to rewind
*/
static void rewindCursor(shellmatta_instance_t *inst, uint32_t length)
{
char terminalCmd[16];
size_t size;
length = SHELLMATTA_MIN (length, inst->cursor);
if(length > 0u)
{
size = snprintf(terminalCmd, sizeof(terminalCmd), "\e[%uD", length);
writeEcho(inst, terminalCmd, size);
inst->cursor -= length;
}
}
/**
* @brief moves the cursor forward by the given amoung of characters
* @param[in] inst pointer to shellmatta instance
* @param[in] length number of characters to move forward
*/
static void forwardCursor(shellmatta_instance_t *inst, uint32_t length)
{
char terminalCmd[16];
size_t size;
length = SHELLMATTA_MAX (length, (inst->inputCount - inst->cursor));
if (length > 0u)
{
size = snprintf(terminalCmd, sizeof(terminalCmd), "\e[%uC", length);
writeEcho(inst, terminalCmd, size);
inst->cursor += length;
}
}
/**
* @brief inserts the given amount of characters at the cursor position
* @param[in] inst pointer to shellmatta instance
* @param[in] data pointer to the data to be inserted
* @param[in] length length of the data to be inserted
*/
static void insertChars(shellmatta_instance_t *inst,
char *data,
uint32_t length)
{
if(0u != length)
{
/** -# check if we have to move chars in the buffer */
if( (inst->cursor != inst->inputCount)
&& (SHELLMATTA_MODE_INSERT == inst->mode))
{
/** -# move the existing chars */
for ( uint32_t i = inst->inputCount;
i > inst->cursor;
i --)
{
inst->buffer[i + length - 1] = inst->buffer[i - 1];
}
/** -# store and print the new chars */
memcpy(&(inst->buffer[inst->cursor]), data, length);
writeEcho(inst, data, length);
/** -# print the other chars and restore the cursor to this position */
eraseLine(inst);
saveCursorPos(inst);
writeEcho( inst,
&(inst->buffer[inst->cursor + length]),
inst->inputCount - inst->cursor);
restoreCursorPos(inst);
}
/** -# just overwrite/append the chars */
else
{
memcpy(&(inst->buffer[inst->cursor]), data, length);
writeEcho(inst, data, length);
}
inst->inputCount += length;
inst->cursor += length;
}
}
/**
* @brief removes the given amount of characters from the current cursor
* position
* @param[in] inst pointer to a shellmatta instance
* @param[in] length number of characters to remove
* @param[in] backspace remove characters left of the cursor
*/
static void removeChars(shellmatta_instance_t *inst,
uint32_t length,
bool backspace)
{
if(0u != length)
{
/** -# rewind the cursor in case of backspace */
if(true == backspace)
{
length = SHELLMATTA_MIN (length, inst->cursor);
rewindCursor(inst, length);
}
else
{
length = SHELLMATTA_MIN (length, inst->inputCount - inst->cursor);
}
/** -# delete the char at the cursor position */
for ( uint32_t i = inst->cursor;
i < (inst->inputCount - length);
i++)
{
inst->buffer[i] = inst->buffer[i + length];
}
/** -# print the rest of the line again */
eraseLine(inst);
saveCursorPos(inst);
writeEcho( inst,
&(inst->buffer[inst->cursor]),
(inst->inputCount - inst->cursor - length));
restoreCursorPos(inst);
inst->inputCount -= length;
}
}
/**
* @brief clears the input buffer and removes the currend command from
* the terminal output
* @param[in] inst pointer to a shellmatta instance
*/
static void clearInput(shellmatta_instance_t *inst)
{
rewindCursor(inst, inst->cursor);
eraseLine(inst);
inst->inputCount = 0u;
inst->dirty = false;
}
/**
* @brief processes the excape character stream of the instance and chacks
* if an arrow key was pressed
* @param[in] inst pointer to a shellmatta instance
* @return #SHELLMATTA_OK if an arrow key was pressed
*/
static shellmatta_retCode_t processArrowKeys(shellmatta_instance_t *inst)
{
shellmatta_retCode_t ret = SHELLMATTA_USE_FAULT;
if ('[' == inst->escapeChars[0])
{
ret = SHELLMATTA_OK;
switch (inst->escapeChars[1])
{
case 'A': /* arrow up */
storeHistoryCmd(inst);
if(false == inst->historyReadUp)
{
navigateHistoryCmd(inst, -1);
}
inst->historyReadUp = true;
clearInput(inst);
restoreHistoryCmd(inst);
navigateHistoryCmd(inst, -1);
break;
case 'B': /* arrow down */
if((inst->historyRead != inst->historyEnd))
{
storeHistoryCmd(inst);
if(true == inst->historyReadUp)
{
navigateHistoryCmd(inst, 1);
}
inst->historyReadUp = false;
navigateHistoryCmd(inst, 1);
clearInput(inst);
restoreHistoryCmd(inst);
}
break;
case 'C': /* arrow right */
forwardCursor(inst, 1u);
break;
case 'D': /* arrow left */
rewindCursor(inst, 1u);
break;
default:
/** ignore unknown escape */
ret = SHELLMATTA_USE_FAULT;
break;
}
}
return ret;
}
/**
* @brief handles a ANSI escape sequence to be able to react to some
* special keys
* @param[in] inst pointer to a shellmatta instance
* @param[in] data new received character of the escape sequence
*/
static void handleEscapeSequence(shellmatta_instance_t *inst, char data)
{
switch (inst->escapeCounter)
{
case 1u:
inst->escapeChars[inst->escapeCounter - 1] = data;
inst->escapeCounter ++;
break;
case 2u:
inst->escapeChars[inst->escapeCounter - 1] = data;
/** -# check if an arrow key was pressed */
if(SHELLMATTA_OK == processArrowKeys(inst))
{
inst->escapeCounter = 0u;
}
/** -# check if end was pressed */
else if ( (0x4f == inst->escapeChars[0])
&& (0x46 == inst->escapeChars[1]))
{
forwardCursor(inst, inst->inputCount - inst->cursor);
inst->escapeCounter = 0u;
}
/** -# if the highest bit is not set this is usually not the end of the
* sequence - so we go on */
else if(0u == (0x40 & data))
{
inst->escapeCounter ++;
}
else
{
inst->escapeCounter = 0u;
}
break;
case 3u:
/** -# check if delete was pressed */
inst->escapeChars[inst->escapeCounter - 1] = data;
if( (0x5b == inst->escapeChars[0])
&& (0x33 == inst->escapeChars[1])
&& (0x7e == inst->escapeChars[2]))
{
removeChars(inst, 1u, false);
inst->escapeCounter = 0u;
}
/** -# check if pos1 was pressed */
else if ( (0x5bu == inst->escapeChars[0])
&& (0x31u == inst->escapeChars[1])
&& (0x7eu == inst->escapeChars[2]))
{
rewindCursor(inst, inst->cursor);
inst->escapeCounter = 0u;
}
else if(0u == (0x40u & data))
{
inst->escapeCounter ++;
}
else
{
inst->escapeCounter = 0u;
}
break;
default:
inst->escapeCounter = 0u;
break;
}
}
/**
* @brief terminates an input and prints the prompt again
* @param[in] inst pointer to a shellmatta instance
*/
static void terminateInput(shellmatta_instance_t *inst)
{
inst->inputCount = 0u;
inst->cursor = 0u;
shellmatta_printf(inst, "\r\n%s", inst->prompt);
}
/**
* @brief searches the registered commands for matching ones and prints
* the common part of all matching commands on the output
* if called twice all matching commands are printed
* @param[in] inst pointer to a shellmatta instance
*/
static void doAutocomplete(shellmatta_instance_t *inst)
{
shellmatta_cmd_t *cmd = inst->cmdList;
char *tempCmd = NULL;
uint32_t minLen = 0u;
uint32_t sizeDiff = 0u;
bool exactMatch = true;
uint32_t printedLen = 0u;
uint32_t tempCursor = 0u;
/** -# increase the tab counter to print all matching commands next time */
inst->tabCounter++;
/** -# on douple tab show all matching commands */
if (1u < inst->tabCounter)
{
inst->tabCounter = 0u;
/** -# loop through all registered commands */
while (NULL != cmd)
{
/** -# check if command matches the input */
if( (strlen(cmd->cmd) >= inst->cursor)
&& (0u == memcmp(cmd->cmd, inst->buffer, inst->cursor)))
{
/** -# add newline on first find */
if(0u == printedLen)
{
inst->write("\r\n", 2u);
}
inst->write(cmd->cmd, strlen(cmd->cmd));
printedLen += strlen(cmd->cmd);
inst->write(" ", 4u);
printedLen += 4u;
}
/** -# check if command alias matches the input */
if( (strlen(cmd->cmdAlias) >= inst->cursor)
&& (0u == memcmp(cmd->cmdAlias, inst->buffer, inst->cursor)))
{
/** -# add newline on first find */
if(0u == printedLen)
{
inst->write("\r\n", 2u);
}
inst->write(cmd->cmdAlias, strlen(cmd->cmdAlias));
printedLen += strlen(cmd->cmdAlias);
inst->write(" ", 4u);
printedLen += 4u;
}
cmd = cmd->next;
}
/** -# print input again if a commands was found */
if(printedLen > 0u)
{
writeEcho(inst, "\r\n", 2u);
writeEcho(inst, inst->prompt, strlen(inst->prompt));
writeEcho(inst, inst->buffer, inst->inputCount);
tempCursor = inst->cursor;
inst->cursor = inst->inputCount;
rewindCursor(inst, inst->inputCount - tempCursor);
}
}
/** -# on single tab autocomplete as far as possible */
else if(0u != inst->cursor)
{
/** -# loop through all registered commands */
while (NULL != cmd)
{
/** -# check if command matches the input */
if( (strlen(cmd->cmd) >= inst->cursor)
&& (0u == memcmp(cmd->cmd, inst->buffer, inst->cursor)))
{
/** -# store first match */
if(NULL == tempCmd)
{
tempCmd = cmd->cmd;
minLen = strlen(cmd->cmd);
}
/** -# find common part of the matching commands */
else
{
exactMatch = false;
minLen = SHELLMATTA_MIN(strlen(cmd->cmd), minLen);
for(uint32_t i = 0u; i < minLen; i++)
{
if(cmd->cmd[i] != tempCmd[i])
{
minLen = i;
}
}
}
}
/** -# check if command Alias matches the input */
if( (strlen(cmd->cmdAlias) >= inst->cursor)
&& (0u == memcmp(cmd->cmdAlias, inst->buffer, inst->cursor)))
{
/** -# store first match */
if(NULL == tempCmd)
{
tempCmd = cmd->cmdAlias;
minLen = strlen(cmd->cmdAlias);
}
/** -# find common part of the matches */
else
{
exactMatch = false;
minLen = SHELLMATTA_MIN(strlen(cmd->cmdAlias), minLen);
for(uint32_t i = 0u; i < minLen; i++)
{
if(cmd->cmdAlias[i] != tempCmd[i])
{
minLen = i;
}
}
}
}
cmd = cmd->next;
}
/** -# autocomplete found command */
if(NULL != tempCmd)
{
/** -# calculate the size of the command to be inserted */
sizeDiff = minLen - inst->cursor;
/** -# copy the found part into the buffer and display it */
insertChars(inst, &(tempCmd[inst->cursor]), sizeDiff);
/** -# on exact match there is no need to double Tab to display all */
if(true == exactMatch)
{
inst->tabCounter = 0u;
}
}
}
else
{
/* nothing to do here */
}
}
/**
* @brief prints all possible commands with description and usage
* @param[in] handle handle shellmatta instance handle
* @param[in] arguments not used here
* @param[in] length not used here
* @return #SHELLMATTA_OK
* #SHELLMATTA_ERROR (buffer overflow)
*/
static shellmatta_retCode_t helpCmdFct(shellmatta_handle_t handle, const char *arguments, uint32_t length)
{
shellmatta_retCode_t ret = SHELLMATTA_OK;
shellmatta_instance_t *inst = (shellmatta_instance_t*) handle;
shellmatta_cmd_t *cmd = inst->cmdList;
size_t maxCmdLen = 0u;
size_t maxCmdAliasLen = 0u;
size_t maxCmdHelpLen = 0u;
size_t cmdLen = 0u;
size_t cmdAliasLen = 0u;
size_t cmdHelpLen = 0u;
uint32_t tabCnt = 0u;
static const char tabBuffer[] = { ' ', ' ', ' ', ' ',
' ', ' ', ' ', ' ',
' ', ' ', ' ', ' ',
' ', ' ', ' ', ' '};
/** -# loop through all commands to determine the lengths of each cmd */
while(NULL != cmd)
{
maxCmdLen = SHELLMATTA_MAX(maxCmdLen, strlen(cmd->cmd));
maxCmdAliasLen = SHELLMATTA_MAX(maxCmdAliasLen, strlen(cmd->cmdAlias));
maxCmdHelpLen = SHELLMATTA_MAX(maxCmdHelpLen, strlen(cmd->helpText));
cmd = cmd->next;
}
/** -# loop through all commands and print all possible information */
cmd = inst->cmdList;
while(NULL != cmd)
{
/** -# determine the length of each field to add padding */
cmdLen = strlen(cmd->cmd);
cmdAliasLen = strlen(cmd->cmdAlias);
cmdHelpLen = strlen(cmd->helpText);
shellmatta_printf(handle, "%s ", cmd->cmd);
tabCnt = (maxCmdLen - cmdLen);
SHELLMATTA_PRINT_BUFFER(tabBuffer, tabCnt, inst->write);
shellmatta_printf(handle, "%s ", cmd->cmdAlias);
tabCnt = (maxCmdAliasLen - cmdAliasLen);
SHELLMATTA_PRINT_BUFFER(tabBuffer, tabCnt, inst->write);
shellmatta_printf(handle, "%s ", cmd->helpText);
tabCnt = (maxCmdHelpLen - cmdHelpLen);
SHELLMATTA_PRINT_BUFFER(tabBuffer, tabCnt, inst->write);
shellmatta_printf(handle, "%s\r\n", cmd->usageText);
cmd = cmd->next;
}
(void)arguments;
(void)length;
return ret;
}
shellmatta_cmd_t helpCmd = {"help", "h", "Print this help text", "help", helpCmdFct, NULL};
/* interface functions */
/**
* @}
* @addtogroup shellmatta_api
* @{
*/
/**
* @brief initialize the shellmatta terminal and provide all callbacks
* @param[in,out] inst pointer to a shellmatta instance
* @param[out] handle pointer to shellmatta handle -
* has to be used for all furterh api calls
* @param[in] buffer pointer to the input buffer to use
* @param[in] bufferSize size of the provided input buffer
* @param[in] historyBuffer pointer to the history buffer to use
* NULL in case of no history buffer
* @param[in] historyBufferSize size of the history buffer
* 0 in case of no history buffer
* @param[in] prompt pointer to prompt string - is printed
* after each command
* @param[in] cmdList constant command list if no dynamic
* adding of commands is desired
* @param[in] writeFct function pointer to output function
*/
shellmatta_retCode_t shellmatta_doInit(
shellmatta_instance_t *inst,
shellmatta_handle_t *handle,
char *buffer,
uint32_t bufferSize,
char *historyBuffer,
uint32_t historyBufferSize,
const char *prompt,
const shellmatta_cmd_t *cmdList,
shellmatta_write_t writeFct)
{
/** -# check parameters for plausibility */
if( (NULL != inst)
&& (NULL != handle)
&& (NULL != buffer)
&& (0u != bufferSize)
&& (NULL != prompt)
&& (NULL != writeFct)
&& ((NULL != historyBuffer) || (0u == historyBufferSize)))
{
/** -# copy all provided buffers into the shellmatta instance */
inst->buffer = buffer;
inst->bufferSize = bufferSize;
inst->inputCount = 0u;
inst->cursor = 0u;
inst->historyBuffer = historyBuffer;
inst->historyBufferSize = historyBufferSize;
inst->historyStart = 0u;
inst->historyEnd = 0u;
inst->historyRead = 0u;
inst->historyReadUp = true;
inst->write = writeFct;
inst->prompt = prompt;
inst->echoEnabled = true;
inst->dirty = false;
inst->tabCounter = 0u;
inst->escapeCounter = 0u;
inst->mode = SHELLMATTA_MODE_INSERT;
inst->cmdList = &helpCmd;
inst->cmdListIsConst = false;
if(NULL != cmdList)
{
helpCmd.next = (shellmatta_cmd_t *) cmdList;
inst->cmdListIsConst = true;
}
inst->magic = SHELLMATTA_MAGIC;
*handle = (shellmatta_handle_t)inst;
/** -# print the first prompt */
terminateInput(inst);
}
return SHELLMATTA_OK;
}
/**
* @brief adds a command to the command list alphabetically ordered
* @param[in] handle shellmatta instance handle
* @param[in] cmd pointer to the command to add type #shellmatta_cmd_t
* @return errorcode #SHELLMATTA_OK
* #SHELLMATTA_USE_FAULT (param err)
* SHELLMATTA_DUPLICATE
*/
shellmatta_retCode_t shellmatta_addCmd(shellmatta_handle_t handle, shellmatta_cmd_t *cmd)
{
shellmatta_instance_t *inst = (shellmatta_instance_t*)handle;
shellmatta_cmd_t *tempCmd;
shellmatta_cmd_t **prevCmd;
bool cmdPlaced = false;
shellmatta_retCode_t ret = SHELLMATTA_OK;
int cmdDiff = 0;
int aliasDiff = 0;
/** -# check parameters for plausibility */
if( (NULL != inst)
&& (SHELLMATTA_MAGIC == inst->magic)
&& (false == inst->cmdListIsConst))
{
tempCmd = inst->cmdList;
prevCmd = &inst->cmdList;
/** -# register first command as list entry */
if (NULL == tempCmd)
{
inst->cmdList = cmd;
cmd->next = NULL;
}
/** -# append the new command sorted */
else
{
while ((false == cmdPlaced) && (SHELLMATTA_OK == ret))
{
cmdDiff = strcmp(tempCmd->cmd, cmd->cmd);
aliasDiff = strcmp(tempCmd->cmdAlias, cmd->cmdAlias);
/** -# check for a duplicate command */
if((0u == cmdDiff) || (0u == aliasDiff))
{
ret = SHELLMATTA_DUPLICATE;
}
else if(0 < cmdDiff)
{
cmd->next = tempCmd;
*prevCmd = cmd;
cmdPlaced = true;
}
else if(NULL == tempCmd->next)
{
tempCmd->next = cmd;
cmd->next = NULL;
cmdPlaced = true;
}
else
{
/* nothing to do */
}
prevCmd = &tempCmd;
tempCmd = tempCmd->next;
}
}
}
else
{
ret = SHELLMATTA_USE_FAULT;
}
return ret;
}
/**
* @brief processes the passed amount of data
* @param[in] handle shellmatta instance handle
* @param[in] data pointer to input data to process
* @param[in] size length of input data to process
* @return errorcode #SHELLMATTA_OK
* #SHELLMATTA_USE_FAULT
*/
shellmatta_retCode_t shellmatta_processData(shellmatta_handle_t handle,
char *data,
uint32_t size)
{
shellmatta_cmd_t *cmd;
uint8_t cmdExecuted = 0u;
shellmatta_retCode_t ret = SHELLMATTA_OK;
shellmatta_instance_t *inst = (shellmatta_instance_t*)handle;
/** -# check parameters for plausibility */
if( (NULL != inst)
&& (SHELLMATTA_MAGIC == inst->magic))
{
/** -# process byte wise */
for (uint32_t i = 0u; i < size; i++)
{
/** -# handle escape sequences */
if(inst->escapeCounter != 0u)
{
handleEscapeSequence(inst, *data);
}
/** -# handle return as start of processing the command */
else if ('\r' == *data)
{
cmd = inst->cmdList;
inst->buffer[inst->inputCount] = 0u;
/** -# store the current command and reset the history buffer */
inst->dirty = true;
storeHistoryCmd(inst);
resetHistoryBuffer(inst);
/** -# search for a matching command */
while (NULL != cmd)
{
if ( (0 == strcmp(inst->buffer, cmd->cmd))
|| (0 == strcmp(inst->buffer, cmd->cmdAlias)))
{
inst->write("\r\n", 2u);
cmdExecuted = 1u;
cmd->cmdFct(inst, inst->buffer, inst->inputCount);
cmd = NULL;
}
else
{
cmd = cmd->next;
}
}
if ((cmdExecuted == 0u) && (inst->inputCount > 0))
{
inst->buffer[inst->inputCount] = '\0';
shellmatta_printf( inst,
"\r\nCommand: %s not found",
inst->buffer);
}
terminateInput(inst);
}
/** -# check for tabulator key - auto complete */
else if('\t' == *data)
{
inst->dirty = true;
doAutocomplete(inst);
}
/** -# check for cancel -
* terminate current input and print prompt again */
else if(3 == *data)
{
inst->dirty = false;
resetHistoryBuffer(inst);
terminateInput(inst);
}
/** -# check for backspace */
else if('\b' == *data)
{
inst->dirty = true;
removeChars(inst, 1u, true);
}
/** -# check for delete key */
else if(0x7eu == *data)
{
inst->dirty = true;
removeChars(inst, 1u, false);
}
/** -# check for start of escape sequence */
else if('\e' == *data)
{
inst->escapeCounter = 1u;
}
else
{
inst->dirty = true;
insertChars(inst, data, 1);
}
/** -# reset tab counter on not a tab */
if ('\t' != *data)
{
inst->tabCounter = 0u;
}
data ++;
}
}
else
{
ret = SHELLMATTA_USE_FAULT;
}
return ret;
}
/**
* @brief printf like function to print output to the instances output
* @param[in] handle shellmatta instance handle
* @param[in] fmt format string and parameters
* @return errorcode #SHELLMATTA_OK
* #SHELLMATTA_USE_FAULT (no valid instance)
* #SHELLMATTA_ERROR (buffer overflow or format err)
*/
shellmatta_retCode_t shellmatta_printf( shellmatta_handle_t handle,
const char *fmt,
...)
{
char outputBuffer[SHELLMATTA_OUTPUT_BUFFER_SIZE];
va_list arg;
int length;
shellmatta_retCode_t ret = SHELLMATTA_OK;
shellmatta_instance_t *inst = (shellmatta_instance_t*)handle;
/** -# check parameters for plausibility */
if( (NULL != inst)
&& (SHELLMATTA_MAGIC == inst->magic))
{
va_start(arg, fmt);
length = vsnprintf(outputBuffer, SHELLMATTA_OUTPUT_BUFFER_SIZE, fmt, arg);
va_end(arg);
if(length < 0)
{
ret = SHELLMATTA_ERROR;
}
else
{
inst->write(outputBuffer, length);
}
}
else
{
ret = SHELLMATTA_USE_FAULT;
}
return ret;
}
/** @} */
/** @} */