349 lines
11 KiB
C
349 lines
11 KiB
C
/*
|
|
* 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_utils.c
|
|
* @brief util/helper functions of shellmatta
|
|
* @author Stefan Strobel <stefan.strobel@shimatta.net>
|
|
*/
|
|
|
|
/**
|
|
* @addtogroup shellmatta_utils
|
|
* @{
|
|
*/
|
|
|
|
#include "shellmatta_utils.h"
|
|
#include "shellmatta.h"
|
|
#include <string.h>
|
|
|
|
/**
|
|
* @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)
|
|
*/
|
|
void utils_writeEcho( shellmatta_instance_t *inst,
|
|
const char *data,
|
|
uint32_t length)
|
|
{
|
|
if(true == inst->echoEnabled)
|
|
{
|
|
inst->write(data, length);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief itoa like function to convert int to an ascii string
|
|
* @warning you have to provide a large enough buffer
|
|
* @param[in] value
|
|
* @param[in,out] buffer
|
|
* @param[in] base
|
|
* @return number of bytes in string
|
|
*/
|
|
uint32_t utils_shellItoa(int32_t value, char *buffer, uint32_t base)
|
|
{
|
|
char tempBuffer[34u];
|
|
uint32_t i;
|
|
uint32_t bufferIdx = 0u;
|
|
char digitValue;
|
|
|
|
/** -# check the base for plausibility */
|
|
if((2 <= base) && (16 >= base))
|
|
{
|
|
/** -# check for sign */
|
|
if(0 > value)
|
|
{
|
|
value = value * (-1);
|
|
buffer[0u] = '-';
|
|
bufferIdx += 1u;
|
|
}
|
|
|
|
/** -# loop through all digits in reverse order */
|
|
i = 0u;
|
|
do
|
|
{
|
|
digitValue = (char) (value % base);
|
|
tempBuffer[i] = (digitValue < 10) ? ('0' + digitValue) : (('A' - 10) + digitValue);
|
|
value /= base;
|
|
i ++;
|
|
}while(value > 0);
|
|
|
|
/** -# store the string in the correct order onto the buffer */
|
|
while(i > 0u)
|
|
{
|
|
buffer[bufferIdx] = tempBuffer[i - 1u];
|
|
i --;
|
|
bufferIdx ++;
|
|
}
|
|
}
|
|
return bufferIdx;
|
|
}
|
|
|
|
/**
|
|
* @brief tells the terminal to save the current cursor position
|
|
* @param[in] inst pointer to shellmatta instance
|
|
*/
|
|
void utils_saveCursorPos(shellmatta_instance_t *inst)
|
|
{
|
|
utils_writeEcho(inst, "\x1b[s", 3u);
|
|
}
|
|
|
|
/**
|
|
* @brief tells the terminal to restore the saved cursor position
|
|
* @param[in] inst pointer to shellmatta instance
|
|
*/
|
|
void utils_restoreCursorPos(shellmatta_instance_t *inst)
|
|
{
|
|
utils_writeEcho(inst, "\x1b[u", 3u);
|
|
}
|
|
|
|
/**
|
|
* @brief tells the terminal to erase the line on the right side of the
|
|
* cursor
|
|
* @param[in] inst pointer to shellmatta instance
|
|
*/
|
|
void utils_eraseLine(shellmatta_instance_t *inst)
|
|
{
|
|
utils_writeEcho(inst, "\x1b[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
|
|
*/
|
|
void utils_rewindCursor(shellmatta_instance_t *inst, uint32_t length)
|
|
{
|
|
char terminalCmd[16];
|
|
size_t size;
|
|
|
|
length = SHELLMATTA_MIN (length, inst->cursor);
|
|
if(length > 0u)
|
|
{
|
|
terminalCmd[0] = '\x1b';
|
|
terminalCmd[1] = '[';
|
|
size = 2u + utils_shellItoa(length, &terminalCmd[2], 10);
|
|
terminalCmd[size] = 'D';
|
|
utils_writeEcho(inst, terminalCmd, size + 1u);
|
|
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
|
|
*/
|
|
void utils_forwardCursor(shellmatta_instance_t *inst, uint32_t length)
|
|
{
|
|
char terminalCmd[16];
|
|
size_t size;
|
|
|
|
length = SHELLMATTA_MIN (length, (inst->inputCount - inst->cursor));
|
|
if (length > 0u)
|
|
{
|
|
terminalCmd[0] = '\x1b';
|
|
terminalCmd[1] = '[';
|
|
size = 2u + utils_shellItoa(length, &terminalCmd[2], 10);
|
|
terminalCmd[size] = 'C';
|
|
utils_writeEcho(inst, terminalCmd, size + 1u);
|
|
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
|
|
*/
|
|
void utils_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);
|
|
utils_writeEcho(inst, data, length);
|
|
|
|
/** -# print the other chars and restore the cursor to this position */
|
|
utils_eraseLine(inst);
|
|
utils_saveCursorPos(inst);
|
|
utils_writeEcho( inst,
|
|
&(inst->buffer[inst->cursor + length]),
|
|
inst->inputCount - inst->cursor);
|
|
utils_restoreCursorPos(inst);
|
|
}
|
|
/** -# just overwrite/append the chars */
|
|
else
|
|
{
|
|
memcpy(&(inst->buffer[inst->cursor]), data, length);
|
|
utils_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
|
|
*/
|
|
void utils_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);
|
|
utils_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 */
|
|
utils_eraseLine(inst);
|
|
utils_saveCursorPos(inst);
|
|
utils_writeEcho( inst,
|
|
&(inst->buffer[inst->cursor]),
|
|
(inst->inputCount - inst->cursor - length));
|
|
utils_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
|
|
*/
|
|
void utils_clearInput(shellmatta_instance_t *inst)
|
|
{
|
|
utils_rewindCursor(inst, inst->cursor);
|
|
utils_eraseLine(inst);
|
|
inst->inputCount = 0u;
|
|
inst->dirty = false;
|
|
}
|
|
|
|
/**
|
|
* @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);
|
|
|
|
inst->write(cmd->cmd, strlen(cmd->cmd));
|
|
tabCnt = (maxCmdLen - cmdLen) + 2u;
|
|
SHELLMATTA_PRINT_BUFFER(tabBuffer, tabCnt, inst->write);
|
|
|
|
inst->write(cmd->cmdAlias, strlen(cmd->cmdAlias));
|
|
tabCnt = (maxCmdAliasLen - cmdAliasLen) + 2u;
|
|
SHELLMATTA_PRINT_BUFFER(tabBuffer, tabCnt, inst->write);
|
|
|
|
inst->write(cmd->helpText, strlen(cmd->helpText));
|
|
tabCnt = (maxCmdHelpLen - cmdHelpLen) + 2u;
|
|
SHELLMATTA_PRINT_BUFFER(tabBuffer, tabCnt, inst->write);
|
|
|
|
inst->write(cmd->usageText, strlen(cmd->usageText));
|
|
inst->write("\r\n", 2u);
|
|
|
|
cmd = cmd->next;
|
|
}
|
|
|
|
(void)arguments;
|
|
(void)length;
|
|
|
|
return ret;
|
|
}
|
|
shellmatta_cmd_t helpCmd = {(char*)"help", (char*)"h", (char*)"Print this help text", (char*)"help", helpCmdFct, NULL};
|
|
|
|
/**
|
|
* @brief terminates an input and prints the prompt again
|
|
* @param[in] inst pointer to a shellmatta instance
|
|
*/
|
|
void utils_terminateInput(shellmatta_instance_t *inst)
|
|
{
|
|
inst->inputCount = 0u;
|
|
inst->lastNewlineIdx = 0u;
|
|
inst->hereLength = 0u;
|
|
inst->cursor = 0u;
|
|
inst->write("\r\n", 2u);
|
|
inst->write(inst->prompt, strlen(inst->prompt));
|
|
}
|
|
|
|
/**
|
|
* @}
|
|
*/
|