gnulib/lib/localeinfo.h

/* locale information

   Copyright 2016-2020 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
   02110-1301, USA.  */

/* Written by Paul Eggert.  */

#include <limits.h>
#include <stdbool.h>
#include <wchar.h>

struct localeinfo
{
  /* MB_CUR_MAX > 1.  */
  bool multibyte;

  /* The locale is simple, like the C locale.  These locales can be
     processed more efficiently, as they are single-byte, their native
     character set is in collating-sequence order, and they do not
     have multi-character collating elements.  */
  bool simple;

  /* The locale uses UTF-8.  */
  bool using_utf8;

  /* An array indexed by byte values B that contains 1 if B is a
     single-byte character, -1 if B is an encoding error, and -2 if B
     is the leading byte of a multibyte character that contains more
     than one byte.  */
  signed char sbclen[UCHAR_MAX + 1];

  /* An array indexed by byte values B that contains the corresponding
     wide character (if any) for B if sbclen[B] == 1.  WEOF means the
     byte is not a valid single-byte character, i.e., sbclen[B] == -1
     or -2.  */
  wint_t sbctowc[UCHAR_MAX + 1];
};

extern void init_localeinfo (struct localeinfo *);

/* Maximum number of characters that can be the case-folded
   counterparts of a single character, not counting the character
   itself.  This is a generous upper bound.  */
enum { CASE_FOLDED_BUFSIZE = 32 };

extern int case_folded_counterparts (wint_t, wchar_t[CASE_FOLDED_BUFSIZE]);