isoctal
#define isoctal(c) (((u_char)(c)) >= '0' && ((u_char)(c)) <= '7')
isoctal(int c)
#define isoctal(c) ((c) >= '0' && (c) <= '7')
#undef isoctal
#define isoctal(c) (isdigit(c) && (c) != '8' && (c) != '9')
#define isoctal(chr) (((chr) >= '0') && ((chr) <= '7'))
#define isoctal(c) ((c) >= '0' && (c) < '8')
#undef isoctal