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ctype.h

#ifndef _CTYPE_H

extern int __isctype (int __c, int __mask);

# ifndef NOT_IN_libc

/* These accessors are used by the optimized macros to find the
   thread-local cache of ctype information from the current thread's
   locale.  For inside libc, define them as inlines using the _NL_CURRENT
   accessors.  We don't use _NL_CURRENT_LOCALE->__ctype_b here because we
   want to cause a link-time ref to _nl_current_LC_CTYPE under
   NL_CURRENT_INDIRECT.  */

#  include "../locale/localeinfo.h"
#  include <bits/libc-tsd.h>

#  ifndef CTYPE_EXTERN_INLINE /* Used by ctype/ctype-info.c, which see.  */
#   define CTYPE_EXTERN_INLINE extern inline
#  endif

__libc_tsd_define (extern, CTYPE_B)
__libc_tsd_define (extern, CTYPE_TOUPPER)
__libc_tsd_define (extern, CTYPE_TOLOWER)

CTYPE_EXTERN_INLINE const uint16_t ** __attribute__ ((const))
__ctype_b_loc (void)
{
  union
    {
      void **ptr;
      const uint16_t **tablep;
    } u;
  u.ptr = __libc_tsd_address (CTYPE_B);
  if (__builtin_expect (*u.tablep == NULL, 0))
    *u.tablep = (const uint16_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_CLASS) + 128;
  return u.tablep;
}

CTYPE_EXTERN_INLINE const int32_t ** __attribute__ ((const))
__ctype_toupper_loc (void)
{
  union
    {
      void **ptr;
      const int32_t **tablep;
    } u;
  u.ptr = __libc_tsd_address (CTYPE_TOUPPER);
  if (__builtin_expect (*u.tablep == NULL, 0))
    *u.tablep = ((int32_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_TOUPPER) + 128);
  return u.tablep;
}

CTYPE_EXTERN_INLINE const int32_t ** __attribute__ ((const))
__ctype_tolower_loc (void)
{
  union
    {
      void **ptr;
      const int32_t **tablep;
    } u;
  u.ptr = __libc_tsd_address (CTYPE_TOLOWER);
  if (__builtin_expect (*u.tablep == NULL, 0))
    *u.tablep = ((int32_t *) _NL_CURRENT (LC_CTYPE, _NL_CTYPE_TOLOWER) + 128);
  return u.tablep;
}

# endif     /* Not NOT_IN_libc.  */

# include <ctype/ctype.h>

# if !defined __NO_CTYPE && !defined NOT_IN_libc
/* The spec says that isdigit must only match the decimal digits.  We
   can check this without a memory access.  */
#  undef isdigit
#  define isdigit(c) ({ int __c = (c); __c >= '0' && __c <= '9'; })
#  undef isdigit_l
#  define isdigit_l(c, l) ({ int __c = (c); __c >= '0' && __c <= '9'; })
#  undef __isdigit_l
#  define __isdigit_l(c, l) ({ int __c = (c); __c >= '0' && __c <= '9'; })
# endif

#endif /* ctype.h */

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