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 #define isdigit(c)      ((__ismask(c)&(_D)) != 0)
  26 #define isgraph(c)      ((__ismask(c)&(_P|_U|_L|_D)) != 0)
  27 #define islower(c)      ((__ismask(c)&(_L)) != 0)
  28 #define isprint(c)      ((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
  29 #define ispunct(c)      ((__ismask(c)&(_P)) != 0)
  30 #define isspace(c)      ((__ismask(c)&(_S)) != 0)
  31 #define isupper(c)      ((__ismask(c)&(_U)) != 0)
  32 #define isxdigit(c)     ((__ismask(c)&(_D|_X)) != 0)
  33
  34 /*
  35  * Rather than doubling the size of the _ctype lookup table to hold a 'blank'
  36  * flag, just check for space or tab.
  37  */
  38 #define isblank(c)      (c == ' ' || c == '\t')
  39
  40 #define isascii(c) (((unsigned char)(c))<=0x7f)
  41 #define toascii(c) (((unsigned char)(c))&0x7f)
  42
  43 static inline unsigned char __tolower(unsigned char c)
  44 {
  45         if (isupper(c))
  46                 c -= 'A'-'a';
  47         return c;
  48 }
  49
  50 static inline unsigned char __toupper(unsigned char c)
  51 {
  52         if (islower(c))
  53                 c -= 'a'-'A';
  54         return c;
  55 }
  56
  57 #define tolower(c) __tolower(c)
  58 #define toupper(c) __toupper(c)
  59
  60 #endif