typedef unsigned char		uart_uint8;
typedef unsigned short	uart_uint16;
typedef unsigned int		uart_uint32;
typedef unsigned char		uart_uchar;

void _putchar(int c);
void _puts(char *s);
uart_uint16 _strlen(char *s);
void _echo();
uart_uchar _getchar(void);
void _strrev(char *tempstr);
char* _strcpy(char *s2, char *s1);
void print_hex_oct( long int, int, int, int, int, int *);
void float_print(long double, long double, int, int *);
int format_val(char *, long, int *, int);
int _printf(const char * , ...);