102 lines
3.3 KiB
C
102 lines
3.3 KiB
C
/* Determine the number of screen columns needed for a 32-bit wide character.
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Copyright (C) 2020-2025 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Bruno Haible <bruno@clisp.org>, 2023. */
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#include <config.h>
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#define IN_C32WIDTH
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/* Specification. */
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#include <uchar.h>
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#include <wchar.h>
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#ifdef __CYGWIN__
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# include <cygwin/version.h>
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#endif
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#if GNULIB_defined_mbstate_t
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# include "streq.h"
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#endif
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#include "localcharset.h"
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#if GL_CHAR32_T_IS_UNICODE
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# include "lc-charset-unicode.h"
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#endif
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#include "uniwidth.h"
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#if _GL_WCHAR_T_IS_UCS4 && !GNULIB_defined_mbstate_t
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_GL_EXTERN_INLINE
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#endif
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int
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c32width (char32_t wc)
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{
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/* The char32_t encoding of a multibyte character is defined by the way
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mbrtoc32() is defined. */
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#if GNULIB_defined_mbstate_t /* AIX, IRIX */
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/* mbrtoc32() is defined on top of mbtowc() for the non-UTF-8 locales
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and directly for the UTF-8 locales. */
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const char *encoding = locale_charset ();
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if (STREQ_OPT (encoding, "UTF-8", 'U', 'T', 'F', '-', '8', 0, 0, 0, 0))
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return uc_width (wc, encoding);
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else
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return wcwidth (wc);
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#elif HAVE_WORKING_MBRTOC32 && HAVE_WORKING_C32RTOMB /* glibc, Android */
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/* mbrtoc32() is essentially defined by the system libc. */
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# if _GL_WCHAR_T_IS_UCS4
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/* The char32_t encoding of a multibyte character is known to be the same as
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the wchar_t encoding. */
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return wcwidth (wc);
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# else
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/* The char32_t encoding of a multibyte character is known to be UCS-4,
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different from the wchar_t encoding. */
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return uc_width (wc, locale_charset ());
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# endif
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#elif _GL_SMALL_WCHAR_T /* Cygwin, mingw, MSVC */
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/* The wchar_t encoding is UTF-16.
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The char32_t encoding is UCS-4. */
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# if defined __CYGWIN__ && CYGWIN_VERSION_DLL_MAJOR >= 1007 && 0
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/* As an extension to POSIX, the wcwidth() function of Cygwin >= 1.7
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supports also wc arguments outside the Unicode BMP, that is, outside
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the 'wchar_t' range. See
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<https://www.cygwin.com/cgit/newlib-cygwin/commit/?id=098a75dc51caa98f369d98a9809d773bc45329aa>.
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But the resulting values for these characters are not of good quality. */
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return wcwidth (wc);
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# else
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if (wc == (wchar_t) wc)
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/* wc is in the range for the wcwidth function. */
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return wcwidth (wc);
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else
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return uc_width (wc, locale_charset ());
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# endif
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#else /* macOS, FreeBSD, NetBSD, OpenBSD, HP-UX, Solaris, Minix, Android */
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/* char32_t and wchar_t are equivalent. */
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static_assert (sizeof (char32_t) == sizeof (wchar_t));
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# if GL_CHAR32_T_IS_UNICODE && GL_CHAR32_T_VS_WCHAR_T_NEEDS_CONVERSION
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return uc_width (wc, locale_charset ());
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# endif
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return wcwidth (wc);
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#endif
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}
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