1 files changed, 105 insertions, 0 deletions
diff --git a/tests/unigbrk/test-u32-grapheme-prev.c b/tests/unigbrk/test-u32-grapheme-prev.c
new file mode 100644
index 0000000..12ff042
--- /dev/null
+++ b/tests/unigbrk/test-u32-grapheme-prev.c
@@ -0,0 +1,105 @@
+/* Previous grapheme cluster test.
+   Copyright (C) 2010-2015 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 <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+
+#include "macros.h"
+
+static void
+test_u32_grapheme_prev (size_t len, ...)
+{
+  const uint32_t *prev;
+  const uint32_t *end;
+  uint32_t s[16];
+  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);
+
+  end = s + n;
+  prev = u32_grapheme_prev (end, s);
+  if (prev != end - len)
+    {
+      size_t i;
+
+      if (prev == NULL)
+        fputs ("u32_grapheme_prev returned NULL", stderr);
+      else
+        fprintf (stderr, "u32_grapheme_prev skipped %zu units", end - prev);
+      fprintf (stderr, ", expected %zu:\n", len);
+      for (i = 0; i < n; i++)
+        fprintf (stderr, " %04x", s[i]);
+      putc ('\n', stderr);
+      abort ();
+    }
+}
+
+int
+main (void)
+{
+  static const uint32_t s[] = { 'a', 'b', 'c' };
+
+  /* Empty string. */
+  ASSERT (u32_grapheme_prev (NULL, NULL) == NULL);
+  ASSERT (u32_grapheme_prev (s, s) == NULL);
+
+  /* Standalone 1-unit graphemes.  */
+  test_u32_grapheme_prev (1, 'a', -1);
+  test_u32_grapheme_prev (1, 'a', 'b', -1);
+  test_u32_grapheme_prev (1, 'a', 'b', 'c', -1);
+
+  /* Multi-unit, single code point graphemes. */
+#define HIRAGANA_A 0x3042       /* あ: Hiragana letter 'a'. */
+  test_u32_grapheme_prev (1, HIRAGANA_A, -1);
+  test_u32_grapheme_prev (1, HIRAGANA_A, 'x', -1);
+  test_u32_grapheme_prev (1, HIRAGANA_A, HIRAGANA_A, -1);
+
+  /* Combining accents. */
+#define GRAVE 0x0300            /* Combining grave accent. */
+#define ACUTE 0x0301            /* Combining acute accent. */
+  test_u32_grapheme_prev (2, 'e', ACUTE, -1);
+  test_u32_grapheme_prev (3, 'e', ACUTE, GRAVE, -1);
+  test_u32_grapheme_prev (1, 'e', ACUTE, 'x', -1);
+  test_u32_grapheme_prev (2, 'e', ACUTE, 'e', ACUTE, -1);
+
+  /* Outside BMP. */
+#define NEUTRAL_FACE 0x1f610    /* 😐: neutral face. */
+  test_u32_grapheme_prev (1, NEUTRAL_FACE, -1);
+  test_u32_grapheme_prev (2, NEUTRAL_FACE, GRAVE, -1);
+
+  return 0;
+}