1 files changed, 44 insertions, 0 deletions
diff --git a/zap/source/any/str/utf8enc.c b/zap/source/any/str/utf8enc.c
new file mode 100644
index 0000000..a6b31c6
--- /dev/null
+++ b/zap/source/any/str/utf8enc.c
@@ -0,0 +1,44 @@
+/*
+	Copyright 2022-2023 Gabriel Jensen.
+	This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
+	If a copy of the MPL was not distributed with this file, You can obtain one at <https://mozilla.org/MPL/2.0>.
+*/
+
+#include <zap/str.h>
+
+void zap_utf8enc(zap_i8 * dest,zap_i02 const * src) {
+	for (;;++src) {
+		zap_i02 const chr = *src;
+		if (chr > 0xFFFFu) { /* Four octets. */
+			*dest = 0xF0u + (chr >> 0x12u);
+			++dest;
+			*dest = 0x80u + (chr >> 0xCu & 0x3Fu);
+			++dest;
+			*dest = 0x80u + (chr >> 0x6u & 0x3Fu);
+			++dest;
+			*dest = 0x80u + (chr & 0x3Fu);
+			++dest;
+			continue;
+		}
+		if (chr >= 0x7FFu) { /* Three octets. */
+			*dest = 0xE0u + (zap_i8)(chr >> 0xCu);
+			++dest;
+			*dest = 0x80u + (zap_i8)(chr >> 0x6u & 0x3Fu);
+			++dest;
+			*dest = 0x80u + (zap_i8)(chr & 0x3Fu);
+			++dest;
+			continue;
+		}
+		if (chr >= 0x7Fu) { /* Two octets. */
+			*dest = 0xC0u + (zap_i8)(chr >> 0x6u);
+			++dest;
+			*dest = 0x80u + (zap_i8)(chr & 0x3Fu);
+			++dest;
+			continue;
+		}
+		/* One octet. */
+		*dest = chr;
+		++dest;
+		if (chr == 0x0u) break;
+	}
+}