include/linux/ctype.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_CTYPE_H
   3 #define _LINUX_CTYPE_H
   4
   5 #include <linux/compiler.h>
   6
   7 /*
   8  * NOTE! This ctype does not handle EOF like the standard C
   9  * library is required to.
  10  */
  11
  12 #define _U      0x01    /* upper */
  13 #define _L      0x02    /* lower */
  14 #define _D      0x04    /* digit */
  15 #define _C      0x08    /* cntrl */
  16 #define _P      0x10    /* punct */
  17 #define _S      0x20    /* white space (space/lf/tab) */
  18 #define _X      0x40    /* hex digit */
  19 #define _SP     0x80    /* hard space (0x20) */
  20
  21 extern const unsigned char _ctype[];
  22
  23 #define __ismask(x) (_ctype[(int)(unsigned char)(x)])
  24
  25 #define isalnum(c)      ((__ismask(c)&(_U|_L|_D)) != 0)
  26 #define isalpha(c)      ((__ismask(c)&(_U|_L)) != 0)
  27 #define iscntrl(c)      ((__ismask(c)&(_C)) != 0)
  28 #define isgraph(c)      ((__ismask(c)&(_P|_U|_L|_D)) != 0)
  29 #define islower(c)      ((__ismask(c)&(_L)) != 0)
  30 #define isprint(c)      ((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
  31 #define ispunct(c)      ((__ismask(c)&(_P)) != 0)
  32 /* Note: isspace() must return false for %NUL-terminator */
  33 #define isspace(c)      ((__ismask(c)&(_S)) != 0)
  34 #define isupper(c)      ((__ismask(c)&(_U)) != 0)
  35 #define isxdigit(c)     ((__ismask(c)&(_D|_X)) != 0)
  36
  37 #define isascii(c) (((unsigned char)(c))<=0x7f)
  38 #define toascii(c) (((unsigned char)(c))&0x7f)
  39
  40 #if __has_builtin(__builtin_isdigit)
  41 #define  isdigit(c) __builtin_isdigit(c)
  42 #else
  43 static inline int isdigit(int c)
  44 {
  45         return '0' <= c && c <= '9';
  46 }
  47 #endif
  48
  49 static inline unsigned char __tolower(unsigned char c)
  50 {
  51         if (isupper(c))
  52                 c -= 'A'-'a';
  53         return c;
  54 }
  55
  56 static inline unsigned char __toupper(unsigned char c)
  57 {
  58         if (islower(c))
  59                 c -= 'a'-'A';
  60         return c;
  61 }
  62
  63 #define tolower(c) __tolower(c)
  64 #define toupper(c) __toupper(c)
  65
  66 /*
  67  * Fast implementation of tolower() for internal usage. Do not use in your
  68  * code.
  69  */
  70 static inline char _tolower(const char c)
  71 {
  72         return c | 0x20;
  73 }
  74
  75 /* Fast check for octal digit */
  76 static inline int isodigit(const char c)
  77 {
  78         return c >= '0' && c <= '7';
  79 }
  80
  81 #endif