-int wc_to_mb(int codepage, int flags, wchar_t *wcstr, int wclen,
- char *mbstr, int mblen, char *defchr, int *defused,
+int wc_to_mb(int codepage, int flags, const wchar_t *wcstr, int wclen,
+ char *mbstr, int mblen, const char *defchr, int *defused,