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+/* Test of c32width() function.
+ Copyright (C) 2007-2024 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Bruno Haible <bruno@clisp.org>, 2007. */
+
+#include <config.h>
+
+#include <uchar.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (c32width, int, (char32_t));
+
+#include <locale.h>
+#include <string.h>
+
+#include "c-ctype.h"
+#include "localcharset.h"
+#include "macros.h"
+
+int
+main ()
+{
+ char32_t wc;
+
+#if !GNULIB_WCHAR_SINGLE_LOCALE
+# ifdef C_CTYPE_ASCII
+ /* Test width of ASCII characters. */
+ for (wc = 0x20; wc < 0x7F; wc++)
+ ASSERT (c32width (wc) == 1);
+# endif
+#endif
+
+ /* Switch to an UTF-8 locale. */
+ if (setlocale (LC_ALL, "fr_FR.UTF-8") != NULL
+ /* Check whether it's really an UTF-8 locale.
+ On OpenBSD 4.0, the setlocale call succeeds only for the LC_CTYPE
+ category and therefore returns "C/fr_FR.UTF-8/C/C/C/C", but the
+ LC_CTYPE category is effectively set to an ASCII LC_CTYPE category;
+ in particular, locale_charset() returns "ASCII". */
+ && strcmp (locale_charset (), "UTF-8") == 0)
+ {
+ /* Test width of ASCII characters. */
+ for (wc = 0x20; wc < 0x7F; wc++)
+ ASSERT (c32width (wc) == 1);
+
+ /* Test width of some non-spacing characters. */
+ ASSERT (c32width (0x0301) == 0);
+ ASSERT (c32width (0x05B0) == 0);
+
+ /* Test width of some format control characters. */
+ ASSERT (c32width (0x200E) <= 0);
+ ASSERT (c32width (0x2060) <= 0);
+ ASSERT (c32width (0xE0001) <= 0);
+ ASSERT (c32width (0xE0044) <= 0);
+
+ /* Test width of some zero width characters. */
+ /* While it is desirable that U+200B, U+200C, U+200D have width 0,
+ because this makes wcswidth work better on strings that contain these
+ characters, it is acceptable if an implementation treats these
+ characters like control characters. */
+ ASSERT (c32width (0x200B) <= 0);
+ ASSERT (c32width (0xFEFF) <= 0);
+
+ /* Test width of some math symbols.
+ U+2202 is marked as having ambiguous width (A) in EastAsianWidth.txt
+ (see <https://www.unicode.org/Public/12.0.0/ucd/EastAsianWidth.txt>).
+ The Unicode Standard Annex 11
+ <https://www.unicode.org/reports/tr11/tr11-36.html>
+ says
+ "Ambiguous characters behave like wide or narrow characters
+ depending on the context (language tag, script identification,
+ associated font, source of data, or explicit markup; all can
+ provide the context). If the context cannot be established
+ reliably, they should be treated as narrow characters by default."
+ For c32width(), the only available context information is the locale.
+ "fr_FR.UTF-8" is a Western locale, not an East Asian locale, therefore
+ U+2202 should be treated like a narrow character. */
+ ASSERT (c32width (0x2202) == 1);
+
+ /* Test width of some CJK characters. */
+ ASSERT (c32width (0x3000) == 2);
+ ASSERT (c32width (0xB250) == 2);
+ ASSERT (c32width (0xFF1A) == 2);
+ #if !(defined __FreeBSD__ && __FreeBSD__ < 13 && !defined __GLIBC__)
+ ASSERT (c32width (0x20369) == 2);
+ ASSERT (c32width (0x2F876) == 2);
+ #endif
+ }
+
+ return 0;
+}