linux/include/linux/ctype.h
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   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
  18extern 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/* Note: isspace() must return false for %NUL-terminator */
  31#define isspace(c)      ((__ismask(c)&(_S)) != 0)
  32#define isupper(c)      ((__ismask(c)&(_U)) != 0)
  33#define isxdigit(c)     ((__ismask(c)&(_D|_X)) != 0)
  34
  35#define isascii(c) (((unsigned char)(c))<=0x7f)
  36#define toascii(c) (((unsigned char)(c))&0x7f)
  37
  38static inline unsigned char __tolower(unsigned char c)
  39{
  40        if (isupper(c))
  41                c -= 'A'-'a';
  42        return c;
  43}
  44
  45static inline unsigned char __toupper(unsigned char c)
  46{
  47        if (islower(c))
  48                c -= 'a'-'A';
  49        return c;
  50}
  51
  52#define tolower(c) __tolower(c)
  53#define toupper(c) __toupper(c)
  54
  55/*
  56 * Fast implementation of tolower() for internal usage. Do not use in your
  57 * code.
  58 */
  59static inline char _tolower(const char c)
  60{
  61        return c | 0x20;
  62}
  63
  64#endif
  65
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