root/include/linux/ctype.h

INCLUDED FROM

DEFINITIONS

1. isdigit
2. __tolower
3. __toupper
4. _tolower
5. isodigit

   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