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/* Convert 32-bit wide character to unibyte character.
Copyright (C) 2020-2024 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 3 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_C32TOB
/* 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
int
c32tob (wint_t wc)
{
#if HAVE_WORKING_MBRTOC32 && HAVE_WORKING_C32RTOMB && !_GL_WCHAR_T_IS_UCS4
/* The char32_t encoding of a multibyte character may be different than its
wchar_t encoding. */
if (wc != WEOF)
{
mbstate_t state;
char buf[8];
mbszero (&state);
if (c32rtomb (buf, wc, &state) == 1)
return (unsigned char) buf[0];
}
return EOF;
#elif _GL_SMALL_WCHAR_T
/* In all known encodings, unibyte characters correspond only to
characters in the BMP. */
if (wc != WEOF && (wchar_t) wc == wc)
return wctob ((wchar_t) wc);
else
return EOF;
#else
# if GL_CHAR32_T_IS_UNICODE && GL_CHAR32_T_VS_WCHAR_T_NEEDS_CONVERSION
if (wc != 0)
{
wc = unicode_to_locale_encoding (wc);
if (wc == 0)
return EOF;
}
# endif
return wctob (wc);
#endif
}
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