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#include <linux/compiler.h>
   6
   7/*
   8 * NOTE! This ctype does not handle EOF like the standard C
   9 * library is required to.
  10 */
  11
  12#define _U      0x01    /* upper */
  13#define _L      0x02    /* lower */
  14#define _D      0x04    /* digit */
  15#define _C      0x08    /* cntrl */
  16#define _P      0x10    /* punct */
  17#define _S      0x20    /* white space (space/lf/tab) */
  18#define _X      0x40    /* hex digit */
  19#define _SP     0x80    /* hard space (0x20) */
  20
  21extern const unsigned char _ctype[];
  22
  23#define __ismask(x) (_ctype[(int)(unsigned char)(x)])
  24
  25#define isalnum(c)      ((__ismask(c)&(_U|_L|_D)) != 0)
  26#define isalpha(c)      ((__ismask(c)&(_U|_L)) != 0)
  27#define iscntrl(c)      ((__ismask(c)&(_C)) != 0)
  28#define isgraph(c)      ((__ismask(c)&(_P|_U|_L|_D)) != 0)
  29#define islower(c)      ((__ismask(c)&(_L)) != 0)
  30#define isprint(c)      ((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0)
  31#define ispunct(c)      ((__ismask(c)&(_P)) != 0)
  32/* Note: isspace() must return false for %NUL-terminator */
  33#define isspace(c)      ((__ismask(c)&(_S)) != 0)
  34#define isupper(c)      ((__ismask(c)&(_U)) != 0)
  35#define isxdigit(c)     ((__ismask(c)&(_D|_X)) != 0)
  36
  37#define isascii(c) (((unsigned char)(c))<=0x7f)
  38#define toascii(c) (((unsigned char)(c))&0x7f)
  39
  40#if __has_builtin(__builtin_isdigit)
  41#define  isdigit(c) __builtin_isdigit(c)
  42#else
  43static inline int isdigit(int c)
  44{
  45        return '0' <= c && c <= '9';
  46}
  47#endif
  48
  49static inline unsigned char __tolower(unsigned char c)
  50{
  51        if (isupper(c))
  52                c -= 'A'-'a';
  53        return c;
  54}
  55
  56static inline unsigned char __toupper(unsigned char c)
  57{
  58        if (islower(c))
  59                c -= 'a'-'A';
  60        return c;
  61}
  62
  63#define tolower(c) __tolower(c)
  64#define toupper(c) __toupper(c)
  65
  66/*
  67 * Fast implementation of tolower() for internal usage. Do not use in your
  68 * code.
  69 */
  70static inline char _tolower(const char c)
  71{
  72        return c | 0x20;
  73}
  74
  75/* Fast check for octal digit */
  76static inline int isodigit(const char c)
  77{
  78        return c >= '0' && c <= '7';
  79}
  80
  81#endif
  82