ctype.h

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#define _U 0x01
#define _L 0x02
#define _N 0x04
#define _S 0x08
#define _P 0x10
#define _C 0x20
#define _X 0x40

extern const char _ctype_[];

#define isalpha(c) ((_ctype_ + 1)[(int)c] & (_U | _L))

#define isupper(c) ((_ctype_ + 1)[(int)c] & _U)

#define islower(c) ((_ctype_ + 1)[(int)c] & _L)

#define isdigit(c) ((_ctype_ + 1)[(int)c] & _N)

#define isxdigit(c) ((_ctype_ + 1)[(int)c] & (_N | _X))

#define isspace(c) ((_ctype_ + 1)[(int)c] & _S)

#define ispunct(c) ((_ctype_ + 1)[(int)c] & _P)

#define isalnum(c) ((_ctype_ + 1)[(int)c] & (_U | _L | _N))

#define isprint(c) ((_ctype_ + 1)[(int)c] & (_P | _U | _L | _N | _S))

#define iscntrl(c) ((_ctype_ + 1)[(int)c] & _C)

#define isascii(c) ((unsigned)((int)(c)) <= 0x7F)

#define toupper(c) (((int)(c)) - 'a' + 'A')

#define tolower(c) (((int)(c)) - 'A' + 'a')

#define toascii(c) (((int)(c)) & 0x7F)

#define iseof(c) (0x04 == (int)c)