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TOMOYO Linux Cross Reference
Linux/include/linux/ctype.h

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  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)
 26 static inline int isdigit(int c)
 27 {
 28         return '' <= 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 
 42 static inline unsigned char __tolower(unsigned char c)
 43 {
 44         if (isupper(c))
 45                 c -= 'A'-'a';
 46         return c;
 47 }
 48 
 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  */
 63 static inline char _tolower(const char c)
 64 {
 65         return c | 0x20;
 66 }
 67 
 68 /* Fast check for octal digit */
 69 static inline int isodigit(const char c)
 70 {
 71         return c >= '' && c <= '7';
 72 }
 73 
 74 #endif
 75 

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