1 files changed, 11 insertions, 0 deletions
diff --git a/regenc.c b/regenc.c
index 16913092ab..4267ebc6ac 100644
--- a/regenc.c
+++ b/regenc.c
@@ -50,6 +50,17 @@ onigenc_set_default_encoding(OnigEncoding enc)
   return 0;
 }
 
+extern int
+onigenc_mbclen_approximate(const OnigUChar* p,const OnigUChar* e, struct OnigEncodingTypeST* enc)
+{
+  int ret = ONIGENC_PRECISE_MBC_ENC_LEN(enc,p,e);
+  if (ONIGENC_MBCLEN_CHARFOUND_P(ret))
+    return ONIGENC_MBCLEN_CHARFOUND_LEN(ret);
+  else if (ONIGENC_MBCLEN_NEEDMORE_P(ret))
+    return e-p+ONIGENC_MBCLEN_NEEDMORE_LEN(ret);
+  return 1;
+}
+
 extern UChar*
 onigenc_get_right_adjust_char_head(OnigEncoding enc, const UChar* start, const UChar* s)
 {