extern char _ctype_[]; #define _U 0001 #define _L 0002 #define _N 0004 #define _S 0010 #define _P 0020 #define _C 0040 #define _X 0100 #define isalpha(c) ((_ctype_+1)[c]&(_U|_L)) #define isupper(c) ((_ctype_+1)[c]&_U) #define islower(c) ((_ctype_+1)[c]&_L) #define isdigit(c) ((_ctype_+1)[c]&_N) #define isxdigit(c) ((_ctype_+1)[c]&(_N|_X)) #define isspace(c) ((_ctype_+1)[c]&_S) #define ispunct(c) ((_ctype_+1)[c]&_P) #define isalnum(c) ((_ctype_+1)[c]&(_U|_L|_N)) #define isprint(c) ((_ctype_+1)[c]&(_P|_U|_L|_N)) #define iscntrl(c) ((_ctype_+1)[c]&_C) #define isascii(c) ((unsigned)(c)<=0177)