1 files changed, 28 insertions, 0 deletions
diff --git a/util.c b/util.c
new file mode 100644
index 0000000..202c750
--- /dev/null
+++ b/util.c
@@ -0,0 +1,28 @@
+static uint32_t
+utf8_encode(uint8_t out[4], uint32_t cp)
+{
+	uint32_t result;
+	if (cp <= 0x7F) {
+		out[0] = cp & 0x7F;
+		result = 1;
+	} else if (cp <= 0x7FF) {
+		result = 2;
+		out[0] = ((cp >>  6) & 0x1F) | 0xC0;
+		out[1] = ((cp >>  0) & 0x3F) | 0x80;
+	} else if (cp <= 0xFFFF) {
+		result = 3;
+		out[0] = ((cp >> 12) & 0x0F) | 0xE0;
+		out[1] = ((cp >>  6) & 0x3F) | 0x80;
+		out[2] = ((cp >>  0) & 0x3F) | 0x80;
+	} else if (cp <= 0x10FFFF) {
+		result = 4;
+		out[0] = ((cp >> 18) & 0x07) | 0xF0;
+		out[1] = ((cp >> 12) & 0x3F) | 0x80;
+		out[2] = ((cp >>  6) & 0x3F) | 0x80;
+		out[3] = ((cp >>  0) & 0x3F) | 0x80;
+	} else {
+		//out[0] = '?';
+		result = 0;
+	}
+	return result;
+}