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 
19 extern 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)
isdigit(int c)26 static 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 
__tolower(unsigned char c)42 static inline unsigned char __tolower(unsigned char c)
43 {
44 	if (isupper(c))
45 		c -= 'A'-'a';
46 	return c;
47 }
48 
__toupper(unsigned char c)49 static 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  */
_tolower(const char c)63 static inline char _tolower(const char c)
64 {
65 	return c | 0x20;
66 }
67 
68 /* Fast check for octal digit */
isodigit(const char c)69 static inline int isodigit(const char c)
70 {
71 	return c >= '0' && c <= '7';
72 }
73 
74 #endif
75