include/linux/ctype.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _LINUX_CTYPE_H
0003 #define _LINUX_CTYPE_H
0004
0005 #include <linux/compiler.h>
0006
0007 /*
0008  * NOTE! This ctype does not handle EOF like the standard C
0009  * library is required to.
0010  */
0011
0012 #define _U  0x01    /* upper */
0013 #define _L  0x02    /* lower */
0014 #define _D  0x04    /* digit */
0015 #define _C  0x08    /* cntrl */
0016 #define _P  0x10    /* punct */
0017 #define _S  0x20    /* white space (space/lf/tab) */
0018 #define _X  0x40    /* hex digit */
0019 #define _SP 0x80    /* hard space (0x20) */
0020
0021 extern const unsigned char _ctype[];
0022
0023 #define __ismask(x) (_ctype[(int)(unsigned char)(x)])
0024
0025 #define isalnum(c)  ((__ismask(c)&(_U|_L|_D)) != 0)
0026 #define isalpha(c)  ((__ismask(c)&(_U|_L)) != 0)
0027 #define iscntrl(c)  ((__ismask(c)&(_C)) != 0)
0028 #define isgraph(c)  ((__ismask(c)&(_P|_U|_L|_D)) != 0)
0029 #define islower(c)  ((__ismask(c)&(_L)) != 0)
0030 #define isprint(c)  ((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
0031 #define ispunct(c)  ((__ismask(c)&(_P)) != 0)
0032 /* Note: isspace() must return false for %NUL-terminator */
0033 #define isspace(c)  ((__ismask(c)&(_S)) != 0)
0034 #define isupper(c)  ((__ismask(c)&(_U)) != 0)
0035 #define isxdigit(c) ((__ismask(c)&(_D|_X)) != 0)
0036
0037 #define isascii(c) (((unsigned char)(c))<=0x7f)
0038 #define toascii(c) (((unsigned char)(c))&0x7f)
0039
0040 #if __has_builtin(__builtin_isdigit)
0041 #define  isdigit(c) __builtin_isdigit(c)
0042 #else
0043 static inline int __isdigit(int c)
0044 {
0045     return '0' <= c && c <= '9';
0046 }
0047 #define  isdigit(c) __isdigit(c)
0048 #endif
0049
0050 static inline unsigned char __tolower(unsigned char c)
0051 {
0052     if (isupper(c))
0053         c -= 'A'-'a';
0054     return c;
0055 }
0056
0057 static inline unsigned char __toupper(unsigned char c)
0058 {
0059     if (islower(c))
0060         c -= 'a'-'A';
0061     return c;
0062 }
0063
0064 #define tolower(c) __tolower(c)
0065 #define toupper(c) __toupper(c)
0066
0067 /*
0068  * Fast implementation of tolower() for internal usage. Do not use in your
0069  * code.
0070  */
0071 static inline char _tolower(const char c)
0072 {
0073     return c | 0x20;
0074 }
0075
0076 /* Fast check for octal digit */
0077 static inline int isodigit(const char c)
0078 {
0079     return c >= '0' && c <= '7';
0080 }
0081
0082 #endif