1 files changed, 52 insertions, 0 deletions
diff --git a/lesstest/unicode.c b/lesstest/unicode.c
new file mode 100644
index 000000000000..fa232ee5b8d6
--- /dev/null
+++ b/lesstest/unicode.c
@@ -0,0 +1,52 @@
+#include "lt_types.h"
+
+typedef struct wchar_range { wchar first, last; } wchar_range;
+
+static wchar_range wide_chars[] = {
+#include "../wide.uni"
+};
+static wchar_range compose_table[] = {
+#include "../compose.uni"
+};
+static wchar_range fmt_table[] = {
+#include "../fmt.uni"
+};
+static wchar_range comb_table[] = {
+	{0x0644,0x0622}, {0x0644,0x0623}, {0x0644,0x0625}, {0x0644,0x0627},
+};
+
+static int is_in_table(wchar ch, wchar_range table[], int count) {
+	if (ch < table[0].first)
+		return 0;
+	int lo = 0;
+	int hi = count - 1;
+	while (lo <= hi) {
+		int mid = (lo + hi) / 2;
+		if (ch > table[mid].last)
+			lo = mid + 1;
+		else if (ch < table[mid].first)
+			hi = mid - 1;
+		else
+			return 1;
+	}
+	return 0;
+}
+
+int is_wide_char(wchar ch) {
+	return is_in_table(ch, wide_chars, countof(wide_chars));
+}
+
+int is_composing_char(wchar ch) {
+	return is_in_table(ch, compose_table, countof(compose_table)) ||
+	       is_in_table(ch, fmt_table, countof(fmt_table));
+}
+
+int is_combining_char(wchar ch1, wchar ch2) {
+	int i;
+	for (i = 0; i < countof(comb_table); i++) {
+		if (ch1 == comb_table[i].first &&
+		    ch2 == comb_table[i].last)
+			return 1;
+	}
+	return 0;
+}