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/* Convert unibyte character to 32-bit wide character.
Copyright (C) 2020-2023 Free Software Foundation, Inc.
This file 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.
This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2020. */
#include <config.h>
#define IN_BTOC32
/* Specification. */
#include <uchar.h>
#include <stdio.h>
#include <string.h>
#include <wchar.h>
#if GL_CHAR32_T_IS_UNICODE
# include "lc-charset-unicode.h"
#endif
#if _GL_WCHAR_T_IS_UCS4
_GL_EXTERN_INLINE
#endif
wint_t
btoc32 (int c)
{
#if HAVE_WORKING_MBRTOC32 && !_GL_WCHAR_T_IS_UCS4
/* The char32_t encoding of a multibyte character may be different than its
wchar_t encoding. */
if (c != EOF)
{
mbstate_t state;
char s[1];
char32_t wc;
mbszero (&state);
s[0] = (unsigned char) c;
if (mbrtoc32 (&wc, s, 1, &state) <= 1)
return wc;
}
return WEOF;
#else
/* In all known locale encodings, unibyte characters correspond only to
characters in the BMP. */
wint_t wc = btowc (c);
# if GL_CHAR32_T_IS_UNICODE && GL_CHAR32_T_VS_WCHAR_T_NEEDS_CONVERSION
if (wc != WEOF && wc != 0)
{
wc = locale_encoding_to_unicode (wc);
if (wc == 0)
return WEOF;
}
# endif
return wc;
#endif
}
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