1 files changed, 35 insertions, 0 deletions
diff --git a/zap/src/mem/utf8declen.c b/zap/src/mem/utf8declen.c
new file mode 100644
index 0000000..202e995
--- /dev/null
+++ b/zap/src/mem/utf8declen.c
@@ -0,0 +1,35 @@
+/*
+ Copyright 2022 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/priv.h>
+
+#include <zap/mem.h>
+
+#include <stddef.h>
+
+zap_sz zap_utf8declen(zap_chr8 const * const _in) {
+ zap_sz len = 0x0u;
+ zap_chr8 const * in;
+ for (in = _in;;++len) {
+ zap_chr8 const oct = *in;
+ sus_unlikely (oct == 0x0u) {break;}
+ if (oct >= 0xF0u) {
+ in += 0x4u;
+ continue;
+ }
+ if (oct >= 0xE0u) {
+ in += 0x3u;
+ continue;
+ }
+ if (oct >= 0xC0u) {
+ in += 0x2u;
+ continue;
+ }
+ ++in;
+ continue;
+ }
+ return len;
+}