1 files changed, 14 insertions, 0 deletions
diff --git a/native/jni/src/utils/char_utils.h b/native/jni/src/utils/char_utils.h
index 634c45b04..f28ed5682 100644
--- a/native/jni/src/utils/char_utils.h
+++ b/native/jni/src/utils/char_utils.h
@@ -18,6 +18,7 @@
 #define LATINIME_CHAR_UTILS_H
 
 #include <cctype>
+#include <cstring>
 #include <vector>
 
 #include "defines.h"
@@ -93,6 +94,19 @@ class CharUtils {
     static unsigned short latin_tolower(const unsigned short c);
     static const std::vector<int> EMPTY_STRING;
 
+    // Returns updated code point count. Returns 0 when the code points cannot be marked as a
+    // Beginning-of-Sentence.
+    static AK_FORCE_INLINE int attachBeginningOfSentenceMarker(int *const codePoints,
+            const int codePointCount, const int maxCodePoint) {
+        if (codePointCount >= maxCodePoint) {
+            // the code points cannot be marked as a Beginning-of-Sentence.
+            return 0;
+        }
+        memmove(codePoints + 1, codePoints, sizeof(int) * codePointCount);
+        codePoints[0] = CODE_POINT_BEGINNING_OF_SENTENCE;
+        return codePointCount + 1;
+    }
+
  private:
     DISALLOW_IMPLICIT_CONSTRUCTORS(CharUtils);