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