Merging upstream version 3.4.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 100 insertions, 0 deletions

diff --git a/utf8-combined.c b/utf8-combined.c
new file mode 100644
index 0000000..05958d4
--- /dev/null
+++ b/utf8-combined.c
@@ -0,0 +1,100 @@
+/* $OpenBSD$ */
+
+/*
+ * Copyright (c) 2023 Nicholas Marriott <nicholas.marriott@gmail.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+
+#include <stdlib.h>
+#include <string.h>
+#include <wchar.h>
+
+#include "tmux.h"
+
+static const wchar_t utf8_modifier_table[] = {
+	0x1F1E6,
+	0x1F1E7,
+	0x1F1E8,
+	0x1F1E9,
+	0x1F1EA,
+	0x1F1EB,
+	0x1F1EC,
+	0x1F1ED,
+	0x1F1EE,
+	0x1F1EF,
+	0x1F1F0,
+	0x1F1F1,
+	0x1F1F2,
+	0x1F1F3,
+	0x1F1F4,
+	0x1F1F5,
+	0x1F1F6,
+	0x1F1F7,
+	0x1F1F8,
+	0x1F1F9,
+	0x1F1FA,
+	0x1F1FB,
+	0x1F1FC,
+	0x1F1FD,
+	0x1F1FE,
+	0x1F1FF,
+	0x1F3FB,
+	0x1F3FC,
+	0x1F3FD,
+	0x1F3FE,
+	0x1F3FF
+};
+
+/* Has this got a zero width joiner at the end? */
+int
+utf8_has_zwj(const struct utf8_data *ud)
+{
+	if (ud->size < 3)
+		return (0);
+	return (memcmp(ud->data + ud->size - 3, "\342\200\215", 3) == 0);
+}
+
+/* Is this a zero width joiner? */
+int
+utf8_is_zwj(const struct utf8_data *ud)
+{
+	if (ud->size != 3)
+		return (0);
+	return (memcmp(ud->data, "\342\200\215", 3) == 0);
+}
+
+/* Is this a variation selector? */
+int
+utf8_is_vs(const struct utf8_data *ud)
+{
+	if (ud->size != 3)
+		return (0);
+	return (memcmp(ud->data, "\357\270\217", 3) == 0);
+}
+
+/* Is this in the modifier table? */
+int
+utf8_is_modifier(const struct utf8_data *ud)
+{
+	wchar_t	wc;
+
+	if (utf8_towc(ud, &wc) != UTF8_DONE)
+		return (0);
+	if (!utf8_in_table(wc, utf8_modifier_table,
+	    nitems(utf8_modifier_table)))
+		return (0);
+	return (1);
+}