usr/src/include/ctype.h

/*
 * Copyright (c) 1989 The Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)ctype.h     5.2 (Berkeley) %G%
 */

#define _U      0x01
#define _L      0x02
#define _N      0x04
#define _S      0x08
#define _P      0x10
#define _C      0x20
#define _X      0x40
#define _B      0x80

extern char     _ctype_[];

#define isdigit(c)      ((_ctype_ + 1)[c] & _N)
#define islower(c)      ((_ctype_ + 1)[c] & _L)
#define isspace(c)      ((_ctype_ + 1)[c] & _S)
#define ispunct(c)      ((_ctype_ + 1)[c] & _P)
#define isupper(c)      ((_ctype_ + 1)[c] & _U)
#define isalpha(c)      ((_ctype_ + 1)[c] & (_U|_L))
#define isxdigit(c)     ((_ctype_ + 1)[c] & (_N|_X))
#define isalnum(c)      ((_ctype_ + 1)[c] & (_U|_L|_N))
#define isprint(c)      ((_ctype_ + 1)[c] & (_P|_U|_L|_N|_B))
#define isgraph(c)      ((_ctype_ + 1)[c] & (_P|_U|_L|_N))
#define iscntrl(c)      ((_ctype_ + 1)[c] & _C)
#define isascii(c)      ((unsigned)(c) <= 0177)
#define toupper(c)      ((c) - 'a' + 'A')
#define tolower(c)      ((c) - 'A' + 'a')
#define toascii(c)      ((c) & 0177)