lib/localeinfo.h

   1 /* locale information
   2
   3    Copyright 2016-2024 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation, either version 3, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 /* Written by Paul Eggert.  */
  19
  20 #include <limits.h>
  21 #include <wchar.h>
  22 #if GAWK
  23 /* Use ISO C 99 API.  */
  24 # define char32_t wchar_t
  25 #else
  26 /* Use ISO C 11 + gnulib API.  */
  27 # include <uchar.h>
  28 #endif
  29
  30 #ifdef __cplusplus
  31 extern "C" {
  32 #endif
  33
  34
  35 struct localeinfo
  36 {
  37   /* MB_CUR_MAX > 1.  */
  38   bool multibyte;
  39
  40   /* The locale is simple, like the C locale.  These locales can be
  41      processed more efficiently, as they are single-byte, their native
  42      character set is in collating-sequence order, and they do not
  43      have multi-character collating elements.  */
  44   bool simple;
  45
  46   /* The locale uses UTF-8.  */
  47   bool using_utf8;
  48
  49   /* An array indexed by byte values B that contains 1 if B is a
  50      single-byte character, -1 if B is an encoding error, and -2 if B
  51      is the leading byte of a multibyte character that contains more
  52      than one byte.  */
  53   signed char sbclen[UCHAR_MAX + 1];
  54
  55   /* An array indexed by byte values B that contains the corresponding
  56      32-bit wide character (if any) for B if sbclen[B] == 1.  WEOF means
  57      the byte is not a valid single-byte character, i.e., sbclen[B] == -1
  58      or -2.  */
  59   wint_t sbctowc[UCHAR_MAX + 1];
  60 };
  61
  62 extern void init_localeinfo (struct localeinfo *);
  63
  64 /* Maximum number of characters that can be the case-folded
  65    counterparts of a single character, not counting the character
  66    itself.  This is a generous upper bound.  */
  67 enum { CASE_FOLDED_BUFSIZE = 32 };
  68
  69 extern int case_folded_counterparts (wint_t, char32_t[CASE_FOLDED_BUFSIZE]);
  70
  71
  72 #ifdef __cplusplus
  73 }
  74 #endif