#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <termio.h>
#include <string.h>


/*
*------------------------------------------------------------------------------
*	Definitions
*------------------------------------------------------------------------------
*/

#define TERMINATOR '\e'

void terminit( struct termios* ptopt );
void termrst( struct termios* ptopt );


/*
*------------------------------------------------------------------------------
*	MAIN - localecho - trivial raw echo stdin to stdout
*------------------------------------------------------------------------------
*/
int main( int argc, char* argv[] ) {

	unsigned char bHex = 0;
	struct termios sTermOpt;
	char c;

	/* use --hex to return hex codes instead of character */
	bHex = ( argc > 1 ) && ( strcmp(argv[1], "--hex") == 0 );

	terminit( &sTermOpt );

	while ( c != TERMINATOR ) {
		c = getchar();

		if ( bHex ) printf("%02X ", c);
		else putc( c, stdout );
	}

	putc( '\n', stdout );
	termrst( &sTermOpt );

	return 0;
}


/*
*------------------------------------------------------------------------------
*	Local Functions
*------------------------------------------------------------------------------
*/

/* Init platform terminal options to remove buffering and local echo -- make it raw! */
void terminit( struct termios* ptopt ) {
	static struct termios newt;

    tcgetattr( STDIN_FILENO, ptopt);
    newt = *ptopt;

    /* clear ICANON (buffering) and ECHO */
    newt.c_lflag &= ~(ICANON | ECHO);          
    tcsetattr( STDIN_FILENO, TCSANOW, &newt);
}

/* Reset terminal as it was before invocating this tool */
void termrst( struct termios* ptopt ) {
	tcsetattr( STDIN_FILENO, TCSANOW, ptopt);
}