isoctal
#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
#define isoctal(chr) (((chr) >= '0') && ((chr) <= '7'))