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/* Determine the number of screen columns needed for a 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>, 2023. */
#include <config.h>
#define IN_C32WIDTH
/* Specification. */
#include <uchar.h>
#include <wchar.h>
#ifdef __CYGWIN__
# include <cygwin/version.h>
#endif
#if GNULIB_defined_mbstate_t
# include "streq.h"
#endif
#include "localcharset.h"
#include "uniwidth.h"
#if _GL_WCHAR_T_IS_UCS4 && !GNULIB_defined_mbstate_t
_GL_EXTERN_INLINE
#endif
int
c32width (char32_t wc)
{
/* The char32_t encoding of a multibyte character is defined by the way
mbrtoc32() is defined. */
#if GNULIB_defined_mbstate_t /* AIX, IRIX */
/* mbrtoc32() is defined on top of mbtowc() for the non-UTF-8 locales
and directly for the UTF-8 locales. */
const char *encoding = locale_charset ();
if (STREQ_OPT (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0, 0))
return uc_width (wc, encoding);
else
return wcwidth (wc);
#elif HAVE_WORKING_MBRTOC32 /* glibc */
/* mbrtoc32() is essentially defined by the system libc. */
# if _GL_WCHAR_T_IS_UCS4
/* The char32_t encoding of a multibyte character is known to be the same as
the wchar_t encoding. */
return wcwidth (wc);
# else
/* The char32_t encoding of a multibyte character is known to be UCS-4,
different from the wchar_t encoding. */
return uc_width (wc, locale_charset ());
# endif
#elif _GL_SMALL_WCHAR_T /* Cygwin, mingw, MSVC */
/* The wchar_t encoding is UTF-16.
The char32_t encoding is UCS-4. */
# if defined __CYGWIN__ && CYGWIN_VERSION_DLL_MAJOR >= 1007 && 0
/* As an extension to POSIX, the wcwidth() function of Cygwin >= 1.7
supports also wc arguments outside the Unicode BMP, that is, outside
the 'wchar_t' range. See
<https://www.cygwin.com/cgit/newlib-cygwin/commit/?id=098a75dc51caa98f369d98a9809d773bc45329aa>.
But the resulting values for these characters are not of good quality. */
return wcwidth (wc);
# else
if (wc == (wchar_t) wc)
/* wc is in the range for the wcwidth function. */
return wcwidth (wc);
else
return uc_width (wc, locale_charset ());
# endif
#else /* macOS, FreeBSD, NetBSD, OpenBSD, HP-UX, Solaris, Minix, Android */
/* char32_t and wchar_t are equivalent. */
static_assert (sizeof (char32_t) == sizeof (wchar_t));
return wcwidth (wc);
#endif
}
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