ctype.h

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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_CTYPE_H
#define _LINUX_CTYPE_H
 
#include <linux/compiler.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 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)
 
#if __has_builtin(__builtin_isdigit)
#define  isdigit(c) __builtin_isdigit(c)
#else
static inline int isdigit(int c)
{
    return '0' <= c && c <= '9';
}
#endif
 
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