LXR linux/include/linux/ctype.h

   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
  19extern 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)
  26static 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
  42static inline unsigned char __tolower(unsigned char c)
  43{
  44        if (isupper(c))
  45                c -= 'A'-'a';
  46        return c;
  47}
  48
  49static 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 */
  63static inline char _tolower(const char c)
  64{
  65        return c | 0x20;
  66}
  67
  68/* Fast check for octal digit */
  69static inline int isodigit(const char c)
  70{
  71        return c >= '0' && c <= '7';
  72}
  73
  74#endif
  75