LXR linux/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
  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)
  25static 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
  41static inline unsigned char __tolower(unsigned char c)
  42{
  43        if (isupper(c))
  44                c -= 'A'-'a';
  45        return c;
  46}
  47
  48static 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 */
  62static inline char _tolower(const char c)
  63{
  64        return c | 0x20;
  65}
  66
  67/* Fast check for octal digit */
  68static inline int isodigit(const char c)
  69{
  70        return c >= '0' && c <= '7';
  71}
  72
  73#endif
  74