diff --git a/examples/Makefile b/examples/Makefile
index b71917c..ef6045e 100644
--- a/examples/Makefile
+++ b/examples/Makefile
@@ -10,7 +10,7 @@ TARGET=microrl_test
 all: microrl_test
 
 
-microrl_test: example.o ../src/microrl.o unix_misc/unix_misc.o
+microrl_test: example.o ../src/microrl.o  unix_misc/unix_misc.o
 	$(CC) $^ -o $@ $(LDFLAGS)
 
 %.o: %.c
diff --git a/examples/avr_misc/avr_misc.c b/examples/avr_misc/avr_misc.c
index 1962401..d8cce94 100644
--- a/examples/avr_misc/avr_misc.c
+++ b/examples/avr_misc/avr_misc.c
@@ -29,6 +29,8 @@ char * set_clear_key [] = {_SCMD_PB, _SCMD_PD};
 char * compl_world [_NUM_OF_CMD + 1];
 
 
+void put_char (unsigned char ch);
+
 
 //*****************************************************************************
 void init (void)
@@ -40,6 +42,13 @@ void init (void)
 	DDRD=0xFF;
 }
 
+////*****************************************************************************
+//void put_char (unsigned char ch)
+//{
+//		while (!( UCSRA & (1<<UDRE)));
+//		UDR = (unsigned char) ch;
+//}
+
 //*****************************************************************************
 void print (const char * str)
 {
diff --git a/examples/example.c b/examples/example.c
index a163be5..4460248 100644
--- a/examples/example.c
+++ b/examples/example.c
@@ -11,7 +11,6 @@ microrl_t * prl = &rl;
 int main (void/*int argc, char ** argv*/)
 {
 	init ();
-	
 	// call init with ptr to microrl instance and print callback
 	microrl_init (prl, print);
 	// set callback for execute
diff --git a/examples/unix_misc/unix_misc.c b/examples/unix_misc/unix_misc.c
index 6f5143d..cfa7ff1 100644
--- a/examples/unix_misc/unix_misc.c
+++ b/examples/unix_misc/unix_misc.c
@@ -8,7 +8,8 @@
 
 //*****************************************************************************
 //dummy function, no need on linux-PC
-void init (void){};
+void init (void){
+};
 
 //*****************************************************************************
 // print callback for microrl library
diff --git a/src/config.h b/src/config.h
index e39ec2f..66be2ea 100644
--- a/src/config.h
+++ b/src/config.h
@@ -59,6 +59,14 @@ Enable Handling terminal ESC sequence. If disabling, then cursor arrow, HOME, EN
 use Ctrl+A(B,F,P,N,A,E,H,K,U,C) see README, but decrease code memory.*/
 #define _USE_ESC_SEQ
 
+/*
+Use snprintf from you standard complier library, but it gives some overhead.
+If not defined, use my own u16int_to_str variant, it's save about 800 byte of code size
+on AVR (avr-gcc build).
+Try to build with and without, and compare total code size for tune library.
+*/
+#define _USE_LIBC_STDIO
+
 /*
 Enable 'interrupt signal' callback, if user press Ctrl+C */
 #define _USE_CTLR_C
@@ -68,7 +76,10 @@ Print prompt at 'microrl_init', if enable, prompt will print at startup,
 otherwise first prompt will print after first press Enter in terminal
 NOTE!: Enable it, if you call 'microrl_init' after your communication subsystem 
 already initialize and ready to print message */
-//#define _ENABLE_INIT_PROMPT
+#undef _ENABLE_INIT_PROMPT
+
+
+
 
 /********** END CONFIG SECTION ************/
 
diff --git a/src/microrl.c b/src/microrl.c
index 58ce21f..525850a 100644
--- a/src/microrl.c
+++ b/src/microrl.c
@@ -5,11 +5,13 @@ BUGS and TODO:
 -- rewrite history for use more than 256 byte buffer
 */
 
-#include <stdio.h>
 #include <string.h>
 #include <ctype.h>
 #include <stdlib.h>
 #include "microrl.h"
+#ifdef _USE_LIBC_STDIO
+#include <stdio.h>
+#endif
 
 //#define DBG(...) fprintf(stderr, "\033[33m");fprintf(stderr,__VA_ARGS__);fprintf(stderr,"\033[0m");
 
@@ -221,16 +223,49 @@ inline static void terminal_newline (microrl_t * this)
 	this->print ("\n\r");
 }
 
+#ifndef _USE_LIBC_STDIO
+//*****************************************************************************
+// convert 16 bit value to string
+// 0 value not supported!!! just make empty string
+static void u16bit_to_str (unsigned int nmb, char * buf)
+{
+	char tmp_str [6] = {0,};
+	int i = 0;
+	if (nmb <= 0xFFFF) {
+		while (nmb > 0) {
+			tmp_str[i++] = (nmb % 10) + '0';
+			nmb /=10;
+		}
+		for (int j = 0; j < i; ++j)
+			*(buf++) = tmp_str [i-j-1];
+	}
+	*buf = '\0';
+}
+#endif
+
+
 //*****************************************************************************
 // set cursor at position from begin cmdline (after prompt) + offset
 static void terminal_move_cursor (microrl_t * this, int offset)
 {
 	char str[16] = {0,};
+#ifdef _USE_LIBC_STDIO 
 	if (offset > 0) {
 		snprintf (str, 16, "\033[%dC", offset);
 	} else if (offset < 0) {
 		snprintf (str, 16, "\033[%dD", -(offset));
 	}
+#else 
+	strcpy (str, "\033[");
+	if (offset > 0) {
+		u16bit_to_str (offset, str+2);
+		strcat (str, "C");
+	} else if (offset < 0) {
+		u16bit_to_str (-(offset), str+2);
+		strcat (str, "D");
+	} else
+		return;
+#endif	
 	this->print (str);
 }
 
@@ -238,8 +273,17 @@ static void terminal_move_cursor (microrl_t * this, int offset)
 static void terminal_reset_cursor (microrl_t * this)
 {
 	char str[16];
-	snprintf (str, 16, "\033[%dD\033[%dC", _COMMAND_LINE_LEN + _PROMPT_LEN + 2,
-																					_PROMPT_LEN);
+#ifdef _USE_LIBC_STDIO
+	snprintf (str, 16, "\033[%dD\033[%dC", \
+						_COMMAND_LINE_LEN + _PROMPT_LEN + 2, _PROMPT_LEN);
+
+#else
+	strcpy (str, "\033[");
+	u16bit_to_str ( _COMMAND_LINE_LEN + _PROMPT_LEN + 2,str+2);
+	strcat (str, "D\033[");
+	u16bit_to_str (_PROMPT_LEN, str+strlen(str));
+	strcat (str, "C");
+#endif
 	this->print (str);
 }