-/* Assume invalid characters have width 0. If this is not set, the
- functions return -1 if an invalid or incomplete character occurs. */
-#define MBSW_ACCEPT_INVALID 1
+/* If this bit is set, assume invalid characters have width 0.
+ Otherwise, return -1 upon finding an invalid or incomplete character. */
+#define MBSW_ACCEPT_INVALID 1