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qi-ctype.h

#define _U  0x01  /* upper */
#define _L  0x02  /* lower */
#define _D  0x04  /* digit */
#define _C  0x08  /* cntrl */
#define _P  0x10  /* punct */
#define _S  0x20  /* white space (space/lf/tab) */
#define _X  0x40  /* hex digit */
#define _SP 0x80  /* hard space (0x20) */

extern unsigned char _ctype[];

#define __ismask(x) (_ctype[(int)(unsigned char)(x)])

#define isalnum(c)      ((__ismask(c)&(_U|_L|_D)) != 0)
#define isalpha(c)      ((__ismask(c)&(_U|_L)) != 0)
#define iscntrl(c)      ((__ismask(c)&(_C)) != 0)
#define isdigit(c)      ((__ismask(c)&(_D)) != 0)
#define isgraph(c)      ((__ismask(c)&(_P|_U|_L|_D)) != 0)
#define islower(c)      ((__ismask(c)&(_L)) != 0)
#define isprint(c)      ((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
#define ispunct(c)      ((__ismask(c)&(_P)) != 0)
#define isspace(c)      ((__ismask(c)&(_S)) != 0)
#define isupper(c)      ((__ismask(c)&(_U)) != 0)
#define isxdigit(c)     ((__ismask(c)&(_D|_X)) != 0)

#define isascii(c) (((unsigned char)(c))<=0x7f)
#define toascii(c) (((unsigned char)(c))&0x7f)

static inline unsigned char __tolower(unsigned char c)
{
      if (isupper(c))
            c -= 'A'-'a';
      return c;
}

static inline unsigned char __toupper(unsigned char c)
{
      if (islower(c))
            c -= 'a'-'A';
      return c;
}

#define tolower(c) __tolower(c)
#define toupper(c) __toupper(c)


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