15 #define	isalpha(c)	(_ctype[(unsigned char)(c)]&(_U|_L))  argument
16 #define	isupper(c)	(_ctype[(unsigned char)(c)]&_U)  argument
17 #define	islower(c)	(_ctype[(unsigned char)(c)]&_L)  argument
18 #define	isdigit(c)	(_ctype[(unsigned char)(c)]&_N)  argument
19 #define	isxdigit(c)	(_ctype[(unsigned char)(c)]&_X)  argument
20 #define	isspace(c)	(_ctype[(unsigned char)(c)]&_S)  argument
21 #define	ispunct(c)	(_ctype[(unsigned char)(c)]&_P)  argument
22 #define	isalnum(c)	(_ctype[(unsigned char)(c)]&(_U|_L|_N))  argument
23 #define	isprint(c)	(_ctype[(unsigned char)(c)]&(_P|_U|_L|_N|_B))  argument
24 #define	isgraph(c)	(_ctype[(unsigned char)(c)]&(_P|_U|_L|_N))  argument
25 #define	iscntrl(c)	(_ctype[(unsigned char)(c)]&_C)  argument
26 #define	isascii(c)	((unsigned char)(c)<=0177)  argument
27 #define	_toupper(c)	((c)-'a'+'A')  argument
28 #define	_tolower(c)	((c)-'A'+'a')  argument
29 #define	toascii(c)	((c)&0177)  argument