include/linux/ctype.h

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