1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _LINUX_CTYPE_H
3#define _LINUX_CTYPE_H
4
5/*
6 * NOTE! This ctype does not handle EOF like the standard C
7 * library is required to.
8 */
9
10#define _U 0x01 /* upper */
11#define _L 0x02 /* lower */
12#define _D 0x04 /* digit */
13#define _C 0x08 /* cntrl */
14#define _P 0x10 /* punct */
15#define _S 0x20 /* white space (space/lf/tab) */
16#define _X 0x40 /* hex digit */
17#define _SP 0x80 /* hard space (0x20) */
18
19extern const unsigned char _ctype[];
20
21#define __ismask(x) (_ctype[(int)(unsigned char)(x)])
22
23#define isalnum(c) ((__ismask(c)&(_U|_L|_D)) != 0)
24#define isalpha(c) ((__ismask(c)&(_U|_L)) != 0)
25#define iscntrl(c) ((__ismask(c)&(_C)) != 0)
26static inline int isdigit(int c)
27{
28 return '0' <= c && c <= '9';
29}
30#define isgraph(c) ((__ismask(c)&(_P|_U|_L|_D)) != 0)
31#define islower(c) ((__ismask(c)&(_L)) != 0)
32#define isprint(c) ((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
33#define ispunct(c) ((__ismask(c)&(_P)) != 0)
34/* Note: isspace() must return false for %NUL-terminator */
35#define isspace(c) ((__ismask(c)&(_S)) != 0)
36#define isupper(c) ((__ismask(c)&(_U)) != 0)
37#define isxdigit(c) ((__ismask(c)&(_D|_X)) != 0)
38
39#define isascii(c) (((unsigned char)(c))<=0x7f)
40#define toascii(c) (((unsigned char)(c))&0x7f)
41
42static inline unsigned char __tolower(unsigned char c)
43{
44 if (isupper(c))
45 c -= 'A'-'a';
46 return c;
47}
48
49static inline unsigned char __toupper(unsigned char c)
50{
51 if (islower(c))
52 c -= 'a'-'A';
53 return c;
54}
55
56#define tolower(c) __tolower(c)
57#define toupper(c) __toupper(c)
58
59/*
60 * Fast implementation of tolower() for internal usage. Do not use in your
61 * code.
62 */
63static inline char _tolower(const char c)
64{
65 return c | 0x20;
66}
67
68/* Fast check for octal digit */
69static inline int isodigit(const char c)
70{
71 return c >= '0' && c <= '7';
72}
73
74#endif
75