1 files changed, 8 insertions, 0 deletions

diff --git a/src/charset.h b/src/charset.h
index d385e05bbb6..2cc0f0ce017 100644
--- a/src/charset.h
+++ b/src/charset.h
@@ -839,4 +839,12 @@ extern Lisp_Object Vauto_fill_chars;
     while (i--) *from_p++ = *to_p++;            \
   } while (0)
 
+/* Length of C in bytes.  */
+
+#define CHAR_LEN(C)                                     \
+     (CHAR_CHARSET ((C)) == CHARSET_COMPOSITION         \
+      ? cmpchar_table[COMPOSITE_CHAR_ID ((C))]->len     \
+      : CHARSET_BYTES (CHAR_CHARSET ((C))))
+
+
 #endif /* _CHARSET_H */