--- /dev/null
+/* Grapheme cluster length test.
+ Copyright (C) 2010 Free Software Foundation, Inc.
+
+ This program 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 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
+ 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 <http://www.gnu.org/licenses/>. */
+
+/* Written by Ben Pfaff <blp@cs.stanford.edu>, 2010. */
+
+#include <config.h>
+
+/* Specification. */
+#include <unigbrk.h>
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static void
+test_u16_grapheme_len (size_t len, ...)
+{
+ uint16_t s[16];
+ size_t retval;
+ va_list args;
+ size_t n;
+
+ va_start (args, len);
+ n = 0;
+ for (;;)
+ {
+ int unit = va_arg (args, int);
+ if (unit == -1)
+ break;
+ else if (n >= sizeof s / sizeof *s)
+ abort ();
+
+ s[n++] = unit;
+ }
+ va_end (args);
+
+ retval = u16_grapheme_len (s, n);
+ if (retval != len)
+ {
+ size_t i;
+
+ fprintf (stderr, "u16_grapheme_len counted %zu units, expected %zu:",
+ retval, len);
+ for (i = 0; i < n; i++)
+ fprintf (stderr, " %04x", s[i]);
+ putc ('\n', stderr);
+ abort ();
+ }
+}
+
+
+int
+main (void)
+{
+ /* Empty string. */
+ test_u16_grapheme_len (0, -1);
+
+ /* Standalone 1-unit graphemes. */
+ test_u16_grapheme_len (1, 'a', -1);
+ test_u16_grapheme_len (1, 'a', 'b', -1);
+ test_u16_grapheme_len (1, 'a', 'b', 'c', -1);
+
+ /* Multi-unit, single code point graphemes. */
+#define HIRAGANA_A 0x3042 /* あ: Hiragana letter 'a'. */
+ test_u16_grapheme_len (1, HIRAGANA_A, -1);
+ test_u16_grapheme_len (1, HIRAGANA_A, 'x', -1);
+ test_u16_grapheme_len (1, HIRAGANA_A, HIRAGANA_A, -1);
+
+ /* Combining accents. */
+#define GRAVE 0x0300 /* Combining grave accent. */
+#define ACUTE 0x0301 /* Combining acute accent. */
+ test_u16_grapheme_len (2, 'e', ACUTE, -1);
+ test_u16_grapheme_len (3, 'e', ACUTE, GRAVE, -1);
+ test_u16_grapheme_len (2, 'e', ACUTE, 'x', -1);
+ test_u16_grapheme_len (2, 'e', ACUTE, 'e', ACUTE, -1);
+
+ /* Surrogate pairs. */
+ test_u16_grapheme_len (2, 0xd83d, 0xde10, -1); /* 😐: neutral face. */
+ test_u16_grapheme_len (3, 0xd83d, 0xde10, GRAVE, -1);
+
+ return 0;
+}