Added strwidth() and strchars() functions.
diff --git a/src/proto/mbyte.pro b/src/proto/mbyte.pro
index e805cb4..9519a19 100644
--- a/src/proto/mbyte.pro
+++ b/src/proto/mbyte.pro
@@ -14,6 +14,7 @@
int dbcs_ptr2cells __ARGS((char_u *p));
int latin_ptr2cells_len __ARGS((char_u *p, int size));
int latin_char2cells __ARGS((int c));
+int mb_string2cells __ARGS((char_u *p, int len));
int latin_off2cells __ARGS((unsigned off, unsigned max_off));
int dbcs_off2cells __ARGS((unsigned off, unsigned max_off));
int utf_off2cells __ARGS((unsigned off, unsigned max_off));