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/* ----------------------------------------------------------------------- *
 *
 *   Copyright 2009 Erwan Velu - All Rights Reserved
 *
 *   Permission is hereby granted, free of charge, to any person
 *   obtaining a copy of this software and associated documentation
 *   files (the "Software"), to deal in the Software without
 *   restriction, including without limitation the rights to use,
 *   copy, modify, merge, publish, distribute, sublicense, and/or
 *   sell copies of the Software, and to permit persons to whom
 *   the Software is furnished to do so, subject to the following
 *   conditions:
 *
 *   The above copyright notice and this permission notice shall
 *   be included in all copies or substantial portions of the Software.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *   OTHER DEALINGS IN THE SOFTWARE.
 *
 * -----------------------------------------------------------------------
 */

#include <stdlib.h>
#include <string.h>
#include <syslinux/config.h>
#include <getkey.h>
#include "hdt-cli.h"
#include "hdt-common.h"
#include "lib-ansi.h"

struct cli_mode_descr *list_modes[] = {
	&hdt_mode,
	&dmi_mode,
	&syslinux_mode,
	&pxe_mode,
	&kernel_mode,
	&cpu_mode,
	&pci_mode,
	&vesa_mode,
	&disk_mode,
	&vpd_mode,
	NULL,
};

/*
 * .aliases = {"q", "quit"} won't work since it is an array of pointers, not an
 * array of variables. There is no easy way around it besides declaring the arrays of
 * strings first.
 */
char *exit_aliases[] = {"q", "quit"};
char *help_aliases[] = {"h", "?"};

/* List of aliases */
struct cli_alias hdt_aliases[] = {
	{
		.command = CLI_EXIT,
		.nb_aliases = 2,
		.aliases = exit_aliases,
	},
	{
		.command = CLI_HELP,
		.nb_aliases = 2,
		.aliases = help_aliases,
	},
};

struct cli_mode_descr *current_mode;
int autocomplete_backlog;

struct autocomplete_list {
	char autocomplete_token[MAX_LINE_SIZE];
	struct autocomplete_list *next;
};
struct autocomplete_list* autocomplete_head = NULL;
struct autocomplete_list* autocomplete_tail = NULL;
struct autocomplete_list* autocomplete_last_seen = NULL;

static void autocomplete_add_token_to_list(const char *token)
{
	struct autocomplete_list *new = malloc(sizeof(struct autocomplete_list));

	strncpy(new->autocomplete_token, token, sizeof(new->autocomplete_token));
	new->next = NULL;
	autocomplete_backlog++;

	if (autocomplete_tail != NULL)
		autocomplete_tail->next = new;
	if (autocomplete_head == NULL)
		autocomplete_head = new;
	autocomplete_tail = new;
}

static void autocomplete_destroy_list()
{
	struct autocomplete_list* tmp = NULL;

	while (autocomplete_head != NULL) {
		tmp = autocomplete_head->next;
		free(autocomplete_head);
		autocomplete_head = tmp;
	}
	autocomplete_backlog = 0;
	autocomplete_tail = NULL;
	autocomplete_last_seen = NULL;
}

/**
 * set_mode - set the current mode of the cli
 * @mode:	mode to set
 *
 * Unlike cli_set_mode, this function is not used by the cli directly.
 **/
void set_mode(cli_mode_t mode, struct s_hardware* hardware)
{
	int i = 0;

	switch (mode) {
	case EXIT_MODE:
		hdt_cli.mode = mode;
		break;
	case HDT_MODE:
		hdt_cli.mode = mode;
		snprintf(hdt_cli.prompt, sizeof(hdt_cli.prompt), "%s> ",
			 CLI_HDT);
		break;
	case PXE_MODE:
		if (hardware->sv->filesystem != SYSLINUX_FS_PXELINUX) {
			printf("You are not currently using PXELINUX\n");
			break;
		}
		hdt_cli.mode = mode;
		snprintf(hdt_cli.prompt, sizeof(hdt_cli.prompt), "%s> ",
			 CLI_PXE);
		break;
	case KERNEL_MODE:
		detect_pci(hardware);
		hdt_cli.mode = mode;
		snprintf(hdt_cli.prompt, sizeof(hdt_cli.prompt), "%s> ",
			 CLI_KERNEL);
		break;
	case SYSLINUX_MODE:
		hdt_cli.mode = mode;
		snprintf(hdt_cli.prompt, sizeof(hdt_cli.prompt), "%s> ",
			 CLI_SYSLINUX);
		break;
	case VESA_MODE:
		hdt_cli.mode = mode;
		snprintf(hdt_cli.prompt, sizeof(hdt_cli.prompt), "%s> ",
			 CLI_VESA);
		break;
	case PCI_MODE:
		hdt_cli.mode = mode;
		snprintf(hdt_cli.prompt, sizeof(hdt_cli.prompt), "%s> ",
			 CLI_PCI);
		if (!hardware->pci_detection)
			cli_detect_pci(hardware);
		break;
	case CPU_MODE:
		hdt_cli.mode = mode;
		snprintf(hdt_cli.prompt, sizeof(hdt_cli.prompt), "%s> ",
			 CLI_CPU);
		if (!hardware->dmi_detection)
			detect_dmi(hardware);
		if (!hardware->cpu_detection)
			cpu_detect(hardware);
		break;
	case DMI_MODE:
		detect_dmi(hardware);
		if (!hardware->is_dmi_valid) {
			printf("No valid DMI table found, exiting.\n");
			break;
		}
		hdt_cli.mode = mode;
		snprintf(hdt_cli.prompt, sizeof(hdt_cli.prompt), "%s> ",
			 CLI_DMI);
		break;
	case DISK_MODE:
		detect_disks(hardware);
		hdt_cli.mode = mode;
		snprintf(hdt_cli.prompt, sizeof(hdt_cli.prompt), "%s> ",
			 CLI_DISK);
		break;
	case VPD_MODE:
		detect_vpd(hardware);
		if (!hardware->is_vpd_valid) {
			printf("No valid VPD table found, exiting.\n");
			break;
		}
		hdt_cli.mode = mode;
		snprintf(hdt_cli.prompt, sizeof(hdt_cli.prompt), "%s> ",
			 CLI_VPD);
		break;
	default:
		/* Invalid mode */
		printf("Unknown mode, please choose among:\n");
		while (list_modes[i]) {
			printf("\t%s\n", list_modes[i]->name);
			i++;
		}
	}

	find_cli_mode_descr(hdt_cli.mode, &current_mode);
	/* There is not cli_mode_descr struct for the exit mode */
	if (current_mode == NULL && hdt_cli.mode != EXIT_MODE) {
		/* Shouldn't get here... */
		printf("!!! BUG: Mode '%d' unknown.\n", hdt_cli.mode);
	}
}

/**
 * mode_s_to_mode_t - given a mode string, return the cli_mode_t representation
 **/
cli_mode_t mode_s_to_mode_t(char *name)
{
	int i = 0;

	while (list_modes[i]) {
		if (!strncmp(name, list_modes[i]->name,
			     sizeof(list_modes[i]->name)))
			break;
		i++;
	}

	if (!list_modes[i])
		return INVALID_MODE;
	else
		return list_modes[i]->mode;
}

/**
 * find_cli_mode_descr - find the cli_mode_descr struct associated to a mode
 * @mode:	mode to look for
 * @mode_found:	store the mode if found, NULL otherwise
 *
 * Given a mode name, return a pointer to the associated cli_mode_descr
 * structure.
 * Note: the current mode name is stored in hdt_cli.mode.
 **/
void find_cli_mode_descr(cli_mode_t mode, struct cli_mode_descr **mode_found)
{
	int i = 0;

	while (list_modes[i] &&
	       list_modes[i]->mode != mode)
		i++;

	/* Shouldn't get here... */
	if (!list_modes[i])
		*mode_found = NULL;
	else
		*mode_found = list_modes[i];
}

/**
 * expand_aliases - resolve aliases mapping
 * @line:	command line to parse
 * @command:	first token in the line
 * @module:	second token in the line
 * @argc:	number of arguments
 * @argv:	array of arguments
 *
 * We maintain a small list of static alises to enhance user experience.
 * Only commands can be aliased (first token). Otherwise it can become really hairy...
 **/
static void expand_aliases(char *line __unused, char **command, char **module,
			   int *argc, char **argv)
{
	struct cli_mode_descr *mode;
	int i, j;

	find_cli_mode_descr(mode_s_to_mode_t(*command), &mode);
	if (mode != NULL && *module == NULL) {
		/*
		 * The user specified a mode instead of `set mode...', e.g.
		 * `dmi' instead of `set mode dmi'
		 */

		/* *argv is NULL since *module is NULL */
		*argc = 1;
		*argv = malloc(*argc * sizeof(char *));
		argv[0] = malloc((sizeof(*command) + 1) * sizeof(char));
		strncpy(argv[0], *command, sizeof(*command) + 1);
		dprintf("CLI DEBUG: ALIAS %s ", *command);

		strncpy(*command, CLI_SET, sizeof(CLI_SET));	/* set */

		*module = malloc(sizeof(CLI_MODE) * sizeof(char));
		strncpy(*module, CLI_MODE, sizeof(CLI_MODE));	/* mode */

		dprintf("--> %s %s %s\n", *command, *module, argv[0]);
		goto out;
	}

	/* Simple aliases mapping a single command to another one */
	for (i = 0; i < MAX_ALIASES; i++) {
		for (j = 0; j < hdt_aliases[i].nb_aliases; j++) {
			if (!strncmp(*command, hdt_aliases[i].aliases[j],
			    sizeof(hdt_aliases[i].aliases[j]))) {
				dprintf("CLI DEBUG: ALIAS %s ", *command);
				strncpy(*command, hdt_aliases[i].command,
					sizeof(hdt_aliases[i].command) + 1);
				dprintf("--> %s\n", *command);
				goto out; /* Don't allow chaining aliases */
			}
		}
	}
	return;

out:
	dprintf("CLI DEBUG: New parameters:\n");
	dprintf("CLI DEBUG: command = %s\n", *command);
	dprintf("CLI DEBUG: module  = %s\n", *module);
	dprintf("CLI DEBUG: argc    = %d\n", *argc);
	for (i = 0; i < *argc; i++)
		dprintf("CLI DEBUG: argv[%d] = %s\n", i, argv[0]);
	return;
}

/**
 * parse_command_line - low level parser for the command line
 * @line:	command line to parse
 * @command:	first token in the line
 * @module:	second token in the line
 * @argc:	number of arguments
 * @argv:	array of arguments
 *
 * The format of the command line is:
 *	<main command> [<module on which to operate> [<args>]]
 **/
static void parse_command_line(char *line, char **command, char **module,
			       int *argc, char **argv)
{
	int argc_iter = 0, args_pos = 0, token_found = 0, token_len = 0;
	int args_len = 0;
	char *pch = NULL, *pch_next = NULL, *tmp_pch_next = NULL;

	*command = NULL;
	*module = NULL;
	*argc = 0;

	pch = line;
	while (pch != NULL) {
		pch_next = strchr(pch + 1, ' ');
		tmp_pch_next = pch_next;

		/*
		 * Skip whitespaces if the user entered
		 * 'set   mode        foo' for 'set mode foo'
		 *  ^   ^
		 *  |___|___ pch
		 *      |___ pch_next <- wrong!
		 *
		 *  We still keep the position into tmp_pch_next to compute
		 *  the lenght of the current token.
		 */
		while (pch_next != NULL && !strncmp(pch_next, CLI_SPACE, 1))
			pch_next++;

		/* End of line guaranteed to be zeroed */
		if (pch_next == NULL) {
			token_len = (int) (strchr(pch + 1, '\0') - pch);
			args_len = token_len;
		}
		else {
			token_len = (int) (tmp_pch_next - pch);
			args_len = (int) (pch_next - pch);
		}

		if (token_found == 0) {
			/* Main command to execute */
			*command = malloc((token_len + 1) * sizeof(char));
			strncpy(*command, pch, token_len);
			(*command)[token_len] = '\0';
			dprintf("CLI DEBUG: command = %s\n", *command);
			args_pos += args_len;
		} else if (token_found == 1) {
			/* Module */
			*module = malloc((token_len + 1) * sizeof(char));
			strncpy(*module, pch, token_len);
			(*module)[token_len] = '\0';
			dprintf("CLI DEBUG: module  = %s\n", *module);
			args_pos += args_len;
		} else
			(*argc)++;

		token_found++;
		pch = pch_next;
	}
	dprintf("CLI DEBUG: argc    = %d\n", *argc);

	/* Skip arguments handling if none is supplied */
	if (!*argc)
		return;

	/* Transform the arguments string into an array */
	*argv = malloc(*argc * sizeof(char *));
	pch = strtok(line + args_pos, CLI_SPACE);
	while (pch != NULL) {
		dprintf("CLI DEBUG: argv[%d] = %s\n", argc_iter, pch);
		argv[argc_iter] = malloc(sizeof(pch) * sizeof(char));
		strncpy(argv[argc_iter], pch, sizeof(pch));
		argc_iter++;
		pch = strtok(NULL, CLI_SPACE);
		/*
		 * strtok(NULL, CLI_SPACE) over a stream of spaces
		 * will return an empty string
		 */
		while (pch != NULL && !strncmp(pch, "", 1))
			pch = strtok(NULL, CLI_SPACE);
	}
}

/**
 * find_cli_callback_descr - find a callback in a list of modules
 * @module_name:	Name of the module to find
 * @modules_list:	Lits of modules among which to find @module_name
 * @module_found:	Pointer to the matched module, NULL if not found
 *
 * Given a module name and a list of possible modules, find the corresponding
 * module structure that matches the module name and store it in @module_found.
 **/
void find_cli_callback_descr(const char* module_name,
			     struct cli_module_descr* modules_list,
			     struct cli_callback_descr** module_found)
{
	int modules_iter = 0;

	if (modules_list == NULL)
		goto not_found;

	/* Find the callback to execute */
	while (modules_list->modules[modules_iter].name &&
	       strcmp(module_name,
		      modules_list->modules[modules_iter].name) != 0)
		modules_iter++;

	if (modules_list->modules[modules_iter].name) {
		*module_found = &(modules_list->modules[modules_iter]);
		dprintf("CLI DEBUG: module %s found\n", (*module_found)->name);
		return;
	}

not_found:
	*module_found = NULL;
	return;
}

/**
 * autocomplete_command - print matching commands
 * @command:	Beginning of the command
 *
 * Given a string @command, print all availables commands starting with
 * @command. Commands are found within the list of commands for the current
 * mode and the hdt mode (if the current mode is not hdt).
 **/
static void autocomplete_command(char *command)
{
	int j = 0;
	struct cli_callback_descr* associated_module = NULL;

	/* First take care of the two special commands: 'show' and 'set' */
	if (strncmp(CLI_SHOW, command, strlen(command)) == 0) {
		printf("%s\n", CLI_SHOW);
		autocomplete_add_token_to_list(CLI_SHOW);
	}
	if (strncmp(CLI_SET, command, strlen(command)) == 0) {
		printf("%s\n", CLI_SET);
		autocomplete_add_token_to_list(CLI_SET);
	}

	/*
	 * Then, go through the modes for the special case
	 *	'<mode>' -> 'set mode <mode>'
	 */
	while (list_modes[j]) {
		if (strncmp(list_modes[j]->name, command, strlen(command)) == 0) {
			printf("%s\n", list_modes[j]->name);
			autocomplete_add_token_to_list(list_modes[j]->name);
		}
		j++;
	}

	/*
	 * Let's go now through the list of default_modules for the current mode
	 * (single token commands for the current_mode)
	 */
	j = 0;
	while (current_mode->default_modules->modules[j].name) {
		if (strncmp(current_mode->default_modules->modules[j].name,
			    command,
			    strlen(command)) == 0) {
			printf("%s\n",
				current_mode->default_modules->modules[j].name);
			autocomplete_add_token_to_list(current_mode->default_modules->modules[j].name);
		}
		j++;
	}

	/*
	 * Finally, if the current_mode is not hdt, list the available
	 * default_modules of hdt (these are always available from any mode).
	 */
	if (current_mode->mode == HDT_MODE)
		return;

	j = 0;
	while (hdt_mode.default_modules->modules[j].name) {
		/*
		 * Any default command that is present in hdt mode but
		 * not in the current mode is available. A default
		 * command can be redefined in the current mode though.
		 * This next call tests this use case: if it is
		 * overwritten, do not print it again.
		 */
		find_cli_callback_descr(hdt_mode.default_modules->modules[j].name,
					current_mode->default_modules,
					&associated_module);
		if (associated_module == NULL &&
		    strncmp(command,
			    hdt_mode.default_modules->modules[j].name,
			    strlen(command)) == 0) {
			printf("%s\n",
				hdt_mode.default_modules->modules[j].name);
			autocomplete_add_token_to_list(hdt_mode.default_modules->modules[j].name);
		}
		j++;
	}
}

/**
 * autocomplete_module - print matching modules
 * @command:	Command on the command line (not NULL)
 * @module:	Beginning of the module
 *
 * Given a command @command and a string @module, print all availables modules
 * starting with @module for command @command. Commands are found within the
 * list of commands for the current mode and the hdt mode (if the current mode
 * is not hdt).
 **/
static void autocomplete_module(char *command, char* module)
{
	int j = 0;
	char autocomplete_full_line[MAX_LINE_SIZE];

	if (strncmp(CLI_SHOW, command, strlen(command)) == 0) {
		while (current_mode->show_modules->modules[j].name) {
			if (strncmp(current_mode->show_modules->modules[j].name,
				    module,
				    strlen(module)) == 0) {
				printf("%s\n",
					current_mode->show_modules->modules[j].name);
				sprintf(autocomplete_full_line, "%s %s",
					CLI_SHOW, current_mode->show_modules->modules[j].name);
				autocomplete_add_token_to_list(autocomplete_full_line);
			}
		j++;
		}
	} else if (strncmp(CLI_SET, command, strlen(command)) == 0) {
		j = 0;
		while (current_mode->set_modules->modules[j].name) {
			if (strncmp(current_mode->set_modules->modules[j].name,
				    module,
				    strlen(module)) == 0) {
				printf("%s\n",
					current_mode->set_modules->modules[j].name);
				sprintf(autocomplete_full_line, "%s %s",
					CLI_SET, current_mode->set_modules->modules[j].name);
				autocomplete_add_token_to_list(autocomplete_full_line);
			}
			j++;
		}
	}
}

/**
 * autocomplete - find possible matches for a command line
 * @line:	command line to parse
 **/
static void autocomplete(char *line)
{
	int i;
	int argc = 0;
	char *command = NULL, *module = NULL;
	char **argv = NULL;

	parse_command_line(line, &command, &module, &argc, argv);

	/* If the user specified arguments, there is nothing we can complete */
	if (argc != 0)
		goto out;

	/* No argument, (the start of) a module has been specified */
	if (module != NULL) {
		autocomplete_module(command, module);
		goto out;
	}

	/* No argument, no module, (the start of) a command has been specified */
	if (command != NULL) {
		autocomplete_command(command);
		goto out;
	}

	/* Nothing specified, list available commands */
	//autocomplete_commands();

out:
	/* Let's not forget to clean ourselves */
	free(command);
	free(module);
	for (i = 0; i < argc; i++)
		free(argv[i]);
	free(argv);
	return;
}


/**
 * exec_command - main logic to map the command line to callbacks
 **/
static void exec_command(char *line,
			 struct s_hardware *hardware)
{
	int argc, i = 0;
	char *command = NULL, *module = NULL;
	char **argv = NULL;
	struct cli_callback_descr* current_module = NULL;

	/* This will allocate memory that will need to be freed */
	parse_command_line(line, &command, &module, &argc, argv);

	/* Expand shortcuts, if needed */
	expand_aliases(line, &command, &module, &argc, argv);

	if (module == NULL) {
		dprintf("CLI DEBUG: single command detected\n", CLI_SHOW);
		/*
		 * A single word was specified: look at the list of default
		 * commands in the current mode to see if there is a match.
		 * If not, it may be a generic function (exit, help, ...). These
		 * are stored in the list of default commands of the hdt mode.
		 */
		find_cli_callback_descr(command, current_mode->default_modules,
				        &current_module);
		if (current_module != NULL)
			return current_module->exec(argc, argv, hardware);
		else if (!strncmp(command, CLI_SHOW, sizeof(CLI_SHOW) - 1) &&
			 current_mode->show_modules != NULL &&
			 current_mode->show_modules->default_callback != NULL)
			return current_mode->show_modules
					   ->default_callback(argc,
							      argv,
							      hardware);
		else if (!strncmp(command, CLI_SET, sizeof(CLI_SET) - 1) &&
			 current_mode->set_modules != NULL &&
			 current_mode->set_modules->default_callback != NULL)
			return current_mode->set_modules
					   ->default_callback(argc,
							      argv,
							      hardware);
		else {
			find_cli_callback_descr(command, hdt_mode.default_modules,
					        &current_module);
			if (current_module != NULL)
				return current_module->exec(argc, argv, hardware);
		}

		printf("unknown command: '%s'\n", command);
		return;
	}

	/*
	 * A module has been specified! We now need to find the type of command.
	 *
	 * The syntax of the cli is the following:
	 *    <type of command> <module on which to operate> <args>
	 * e.g.
	 *    dmi> show system
	 *    dmi> show bank 1
	 *    dmi> show memory 0 1
	 *    pci> show device 12
	 *    hdt> set mode dmi
	 */
	if (!strncmp(command, CLI_SHOW, sizeof(CLI_SHOW) - 1)) {
		dprintf("CLI DEBUG: %s command detected\n", CLI_SHOW);
		find_cli_callback_descr(module, current_mode->show_modules,
					&current_module);
		/* Execute the callback */
		if (current_module != NULL)
			return current_module->exec(argc, argv, hardware);
		else {
			find_cli_callback_descr(module, hdt_mode.show_modules,
					        &current_module);
			if (current_module != NULL)
				return current_module->exec(argc, argv, hardware);
		}

		printf("unknown module: '%s'\n", module);
		return;

	} else if (!strncmp(command, CLI_SET, sizeof(CLI_SET) - 1)) {
		dprintf("CLI DEBUG: %s command detected\n", CLI_SET);
		find_cli_callback_descr(module, current_mode->set_modules,
					&current_module);
		/* Execute the callback */
		if (current_module != NULL)
			return current_module->exec(argc, argv, hardware);
		else {
			find_cli_callback_descr(module, hdt_mode.set_modules,
					        &current_module);
			if (current_module != NULL)
				return current_module->exec(argc, argv, hardware);
		}

		printf("unknown module: '%s'\n", module);
		return;

	}

	printf("I don't understand: '%s'. Try 'help'.\n", line);

	/* Let's not forget to clean ourselves */
	free(command);
	free(module);
	for (i = 0; i < argc; i++)
		free(argv[i]);
	free(argv);
}

static void reset_prompt()
{
	/* No need to display the prompt if we exit */
	if (hdt_cli.mode != EXIT_MODE) {
		printf("%s", hdt_cli.prompt);
		/* Reset the line */
		memset(hdt_cli.input, '\0', MAX_LINE_SIZE);
		hdt_cli.cursor_pos = 0;
	}
}

/* Code that manages the cli mode */
void start_cli_mode(struct s_hardware *hardware)
{
	int current_key = 0;
	int future_history_pos=1; /* Temp variable*/
	bool display_history=true; /* Temp Variable*/
	char temp_command[MAX_LINE_SIZE];

	hdt_cli.cursor_pos=0;
	memset(hdt_cli.input, '\0', MAX_LINE_SIZE);
	memset(hdt_cli.history, '\0', sizeof(hdt_cli.history));
	hdt_cli.history_pos=1;
	hdt_cli.max_history_pos=1;

	/* Find the mode selected */
	set_mode(HDT_MODE, hardware);
	find_cli_mode_descr(hdt_cli.mode, &current_mode);
	if (current_mode == NULL) {
		/* Shouldn't get here... */
		printf("!!! BUG: Mode '%d' unknown.\n", hdt_cli.mode);
		return;
	}

	printf("Entering CLI mode\n");

	reset_prompt();

	while (hdt_cli.mode != EXIT_MODE) {

		/* Display the cursor */
		display_cursor(true);

		/* Let's put the cursor blinking until we get an input */
		set_cursor_blink(true);

		/* We wait endlessly for a keyboard input*/
		current_key = get_key(stdin, 0);

		/* We have to cancel the blinking mode to prevent
		 * input text to blink */
		set_cursor_blink(false);

		/* Reset autocomplete buffer unless TAB is pressed */
		if (current_key != KEY_TAB)
			autocomplete_destroy_list();

		switch (current_key) {
			/* clear until then end of line */
		case KEY_CTRL('k'):
			/* Clear the end of the line */
			clear_end_of_line();
			memset(&hdt_cli.input[hdt_cli.cursor_pos], 0,
			       strlen(hdt_cli.input) - hdt_cli.cursor_pos);
			break;

		case KEY_CTRL('c'):
			printf("\n");
			reset_prompt();
			break;

		case KEY_LEFT:
			if (hdt_cli.cursor_pos > 0) {
				move_cursor_left(1);
				hdt_cli.cursor_pos--;
			}
			break;

		case KEY_RIGHT:
			if (hdt_cli.cursor_pos < (int)strlen(hdt_cli.input)) {
				move_cursor_right(1);
				hdt_cli.cursor_pos++;
			}
			break;

		case KEY_CTRL('e'):
		case KEY_END:
			/* Calling with a 0 value will make the cursor move */
			/* So, let's move the cursor only if needed */
			if ((strlen(hdt_cli.input) - hdt_cli.cursor_pos) > 0) {
				/* Return to the begining of line */
				move_cursor_right(strlen(hdt_cli.input) - hdt_cli.cursor_pos);
				hdt_cli.cursor_pos = strlen(hdt_cli.input);
			}
			break;

		case KEY_CTRL('a'):
		case KEY_HOME:
			/* Calling with a 0 value will make the cursor move */
			/* So, let's move the cursor only if needed */
			if (hdt_cli.cursor_pos > 0) {
				/* Return to the begining of line */
				move_cursor_left(hdt_cli.cursor_pos);
				hdt_cli.cursor_pos = 0;
			}
			break;

		case KEY_UP:
			/* We have to compute the next position*/
			future_history_pos=hdt_cli.history_pos;
			if (future_history_pos==1) {
				future_history_pos=MAX_HISTORY_SIZE-1;
			} else {
				future_history_pos--;
			}
			/* Does the next position is valid */
			if (strlen(hdt_cli.history[future_history_pos])==0) break;

			/* Let's make that future position the one we use*/
			hdt_cli.history_pos=future_history_pos;

			/* Clear the line */
			clear_line();

			/* Move to the begining of line*/
			move_cursor_to_column(0);

			reset_prompt();
			printf("%s",hdt_cli.history[hdt_cli.history_pos]);
			strncpy(hdt_cli.input,hdt_cli.history[hdt_cli.history_pos],sizeof(hdt_cli.input));
			hdt_cli.cursor_pos=strlen(hdt_cli.input);
			break;

		case KEY_DOWN:
			display_history=true;

			/* We have to compute the next position*/
			future_history_pos=hdt_cli.history_pos;
			if (future_history_pos==MAX_HISTORY_SIZE-1) {
				future_history_pos=1;
			} else {
				future_history_pos++;
			}
			/* Does the next position is valid */
			if (strlen(hdt_cli.history[future_history_pos])==0) display_history = false;

			/* An exception is made to reach the last empty line */
			if (future_history_pos==hdt_cli.max_history_pos) display_history=true;
			if (display_history==false) break;

			/* Let's make that future position the one we use*/
			hdt_cli.history_pos=future_history_pos;

			/* Clear the line */
			clear_line();

			/* Move to the begining of line*/
			move_cursor_to_column(0);

			reset_prompt();
			printf("%s",hdt_cli.history[hdt_cli.history_pos]);
			strncpy(hdt_cli.input,hdt_cli.history[hdt_cli.history_pos],sizeof(hdt_cli.input));
			hdt_cli.cursor_pos=strlen(hdt_cli.input);
			break;

		case KEY_TAB:
			if (autocomplete_backlog) {
				clear_line();
				/* Move to the begining of line*/
				move_cursor_to_column(0);
				reset_prompt();
				printf("%s",autocomplete_last_seen->autocomplete_token);
				strncpy(hdt_cli.input,autocomplete_last_seen->autocomplete_token,sizeof(hdt_cli.input));
				hdt_cli.cursor_pos=strlen(hdt_cli.input);

				/* Cycle through the list */
				autocomplete_last_seen = autocomplete_last_seen->next;
				if (autocomplete_last_seen == NULL)
					autocomplete_last_seen = autocomplete_head;
			} else {
				printf("\n");
				autocomplete(skip_spaces(hdt_cli.input));
				autocomplete_last_seen = autocomplete_head;

				printf("%s%s", hdt_cli.prompt, hdt_cli.input);
			}
			break;

		case KEY_ENTER:
			printf("\n");
			if (strlen(remove_spaces(hdt_cli.input)) < 1) {
				reset_prompt();
				break;
			}
			if (hdt_cli.history_pos == MAX_HISTORY_SIZE-1) hdt_cli.history_pos=1;
			strncpy(hdt_cli.history[hdt_cli.history_pos],remove_spaces(hdt_cli.input),sizeof(hdt_cli.history[hdt_cli.history_pos]));
			hdt_cli.history_pos++;
			if (hdt_cli.history_pos>hdt_cli.max_history_pos) hdt_cli.max_history_pos=hdt_cli.history_pos;
			exec_command(remove_spaces(hdt_cli.input), hardware);
			reset_prompt();
			break;

 		case KEY_CTRL('d'):
                case KEY_DELETE:
                        /* No need to delete when input is empty */
                        if (strlen(hdt_cli.input)==0) break;
                        /* Don't delete when cursor is at the end of the line */
                        if (hdt_cli.cursor_pos>=strlen(hdt_cli.input)) break;

			for (int c = hdt_cli.cursor_pos;
			     c < (int)strlen(hdt_cli.input) - 1; c++)
				hdt_cli.input[c] = hdt_cli.input[c + 1];
			hdt_cli.input[strlen(hdt_cli.input) - 1] = '\0';

			/* Clear the end of the line */
			clear_end_of_line();

			/* Print the resulting buffer */
			printf("%s", hdt_cli.input + hdt_cli.cursor_pos);

			/* Replace the cursor at the proper place */
			if (strlen(hdt_cli.input + hdt_cli.cursor_pos)>0)
				move_cursor_left(strlen(hdt_cli.input + hdt_cli.cursor_pos));
			break;

		case KEY_DEL:
		case KEY_BACKSPACE:
			/* Don't delete prompt */
			if (hdt_cli.cursor_pos == 0)
				break;

			for (int c = hdt_cli.cursor_pos - 1;
			     c < (int)strlen(hdt_cli.input) - 1; c++)
				hdt_cli.input[c] = hdt_cli.input[c + 1];
			hdt_cli.input[strlen(hdt_cli.input) - 1] = '\0';

			/* Get one char back */
			move_cursor_left(1);

			/* Clear the end of the line */
			clear_end_of_line();

			/* Print the resulting buffer */
			printf("%s", hdt_cli.input + hdt_cli.cursor_pos - 1);

			/* Realing to a char before the place we were */
			hdt_cli.cursor_pos--;
			move_cursor_to_column(strlen(hdt_cli.prompt)+hdt_cli.cursor_pos+1);

			break;

		case KEY_F1:
			printf("\n");
			exec_command(CLI_HELP, hardware);
			reset_prompt();
			break;

		default:
			if ( ( current_key < 0x20 ) || ( current_key > 0x7e ) ) break;
			/* Prevent overflow */
			if (hdt_cli.cursor_pos > MAX_LINE_SIZE - 2)
				break;
			/* If we aren't at the end of the input line, let's insert */
			if (hdt_cli.cursor_pos < (int)strlen(hdt_cli.input)) {
				char key[2];
				int trailing_chars =
				    strlen(hdt_cli.input) - hdt_cli.cursor_pos;
				memset(temp_command, 0, sizeof(temp_command));
				strncpy(temp_command, hdt_cli.input,
					hdt_cli.cursor_pos);
				sprintf(key, "%c", current_key);
				strncat(temp_command, key, 1);
				strncat(temp_command,
					hdt_cli.input + hdt_cli.cursor_pos,
					trailing_chars);
				memset(hdt_cli.input, 0, sizeof(hdt_cli.input));
				snprintf(hdt_cli.input, sizeof(hdt_cli.input), "%s",
					 temp_command);

				/* Clear the end of the line */
				clear_end_of_line();

				/* Print the resulting buffer */
				printf("%s", hdt_cli.input + hdt_cli.cursor_pos);

				/* Return where we must put the new char */
				move_cursor_left(trailing_chars);

			} else {
				putchar(current_key);
				hdt_cli.input[hdt_cli.cursor_pos] = current_key;
			}
			hdt_cli.cursor_pos++;
			break;
		}
	}
}