root/include/linux/ctype.h

INCLUDED FROM

DEFINITIONS

1. __tolower
2. __toupper
3. _tolower
4. isodigit

#ifndef _LINUX_CTYPE_H
#define _LINUX_CTYPE_H

/*
 * NOTE! This ctype does not handle EOF like the standard C
 * library is required to.
 */

#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 const 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)
/* Note: isspace() must return false for %NUL-terminator */
#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)

/*
 * Fast implementation of tolower() for internal usage. Do not use in your
 * code.
 */
static inline char _tolower(const char c)
{
        return c | 0x20;
}

/* Fast check for octal digit */
static inline int isodigit(const char c)
{
        return c >= '0' && c <= '7';
}

#endif