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/* Internal header containing implementation of wcwidth() function.
Copyright (C) 1996-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1996.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <wchar.h>
#include <wctype.h>
#include "../wctype/wchar-lookup.h"
#include "../locale/localeinfo.h"
/* Table containing width information. */
extern const char *__ctype32_width attribute_hidden;
static __inline int
internal_wcwidth (wchar_t wc)
{
unsigned char res;
/* The tables have been prepared in such a way that
1. wc == L'\0' yields res = 0,
2. !iswprint (wc) implies res = '\xff'. */
res = wcwidth_table_lookup (_NL_CURRENT (LC_CTYPE, _NL_CTYPE_WIDTH), wc);
return res == (unsigned char) '\xff' ? -1 : (int) res;
}
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