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 '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 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 >= '0' && c <= '7'; 72 } 73 74 #endif 75