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/* Previous grapheme cluster test.
Copyright (C) 2010-2024 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 <https://www.gnu.org/licenses/>. */
/* Written by Ben Pfaff <blp@cs.stanford.edu>, 2010. */
#include <config.h>
/* Specification. */
#include <unigbrk.h>
#include <stdio.h>
#include <stdlib.h>
#include "macros.h"
static void
test_u8_grapheme_prev (const char *input, size_t n, size_t len)
{
const uint8_t *s = (const uint8_t *) input;
const uint8_t *end = s + n;
const uint8_t *prev = u8_grapheme_prev (end, s);
if (prev != end - len)
{
size_t i;
if (prev == NULL)
fputs ("u8_grapheme_prev returned NULL", stderr);
else
fprintf (stderr, "u8_grapheme_prev skipped %tu bytes", end - prev);
fprintf (stderr, ", expected %zu:\n", len);
for (i = 0; i < n; i++)
fprintf (stderr, " %02x", s[i]);
putc ('\n', stderr);
fflush (stderr);
abort ();
}
}
int
main (void)
{
static const uint8_t s[] = "abc";
/* Empty string. */
ASSERT (u8_grapheme_prev (NULL, NULL) == NULL);
ASSERT (u8_grapheme_prev (s, s) == NULL);
/* Standalone 1-unit graphemes. */
test_u8_grapheme_prev ("a", 1, 1);
test_u8_grapheme_prev ("ab", 2, 1);
test_u8_grapheme_prev ("abc", 3, 1);
/* Multi-unit, single code point graphemes. */
#define HIRAGANA_A "\343\201\202" /* あ: Hiragana letter 'a'. */
test_u8_grapheme_prev (HIRAGANA_A, 3, 3);
test_u8_grapheme_prev (HIRAGANA_A"x", 4, 1);
test_u8_grapheme_prev (HIRAGANA_A HIRAGANA_A, 6, 3);
/* Combining accents. */
#define GRAVE "\314\200" /* Combining grave accent. */
#define ACUTE "\314\201" /* Combining acute accent. */
test_u8_grapheme_prev ("e"ACUTE, 3, 3);
test_u8_grapheme_prev ("e"ACUTE GRAVE, 5, 5);
test_u8_grapheme_prev ("e"ACUTE"x", 4, 1);
test_u8_grapheme_prev ("e"ACUTE "e"ACUTE, 6, 3);
return test_exit_status;
}
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