1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_CTYPE_H
3 #define _LINUX_CTYPE_H
4 
5 #include <linux/compiler.h>
6 
7 /*
8  * NOTE! This ctype does not handle EOF like the standard C
9  * library is required to.
10  */
11 
12 #define _U	0x01	/* upper */
13 #define _L	0x02	/* lower */
14 #define _D	0x04	/* digit */
15 #define _C	0x08	/* cntrl */
16 #define _P	0x10	/* punct */
17 #define _S	0x20	/* white space (space/lf/tab) */
18 #define _X	0x40	/* hex digit */
19 #define _SP	0x80	/* hard space (0x20) */
20 
21 extern const unsigned char _ctype[];
22 
23 #define __ismask(x) (_ctype[(int)(unsigned char)(x)])
24 
25 #define isalnum(c)	((__ismask(c)&(_U|_L|_D)) != 0)
26 #define isalpha(c)	((__ismask(c)&(_U|_L)) != 0)
27 #define iscntrl(c)	((__ismask(c)&(_C)) != 0)
28 #define isgraph(c)	((__ismask(c)&(_P|_U|_L|_D)) != 0)
29 #define islower(c)	((__ismask(c)&(_L)) != 0)
30 #define isprint(c)	((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
31 #define ispunct(c)	((__ismask(c)&(_P)) != 0)
32 /* Note: isspace() must return false for %NUL-terminator */
33 #define isspace(c)	((__ismask(c)&(_S)) != 0)
34 #define isupper(c)	((__ismask(c)&(_U)) != 0)
35 #define isxdigit(c)	((__ismask(c)&(_D|_X)) != 0)
36 
37 #define isascii(c) (((unsigned char)(c))<=0x7f)
38 #define toascii(c) (((unsigned char)(c))&0x7f)
39 
40 #if __has_builtin(__builtin_isdigit)
41 #define  isdigit(c) __builtin_isdigit(c)
42 #else
isdigit(int c)43 static inline int isdigit(int c)
44 {
45 	return '0' <= c && c <= '9';
46 }
47 #endif
48 
__tolower(unsigned char c)49 static inline unsigned char __tolower(unsigned char c)
50 {
51 	if (isupper(c))
52 		c -= 'A'-'a';
53 	return c;
54 }
55 
__toupper(unsigned char c)56 static inline unsigned char __toupper(unsigned char c)
57 {
58 	if (islower(c))
59 		c -= 'a'-'A';
60 	return c;
61 }
62 
63 #define tolower(c) __tolower(c)
64 #define toupper(c) __toupper(c)
65 
66 /*
67  * Fast implementation of tolower() for internal usage. Do not use in your
68  * code.
69  */
_tolower(const char c)70 static inline char _tolower(const char c)
71 {
72 	return c | 0x20;
73 }
74 
75 /* Fast check for octal digit */
isodigit(const char c)76 static inline int isodigit(const char c)
77 {
78 	return c >= '0' && c <= '7';
79 }
80 
81 #endif
82