1 files changed, 4 insertions, 0 deletions
diff --git a/awk.h b/awk.h
index 993e5820..8a5c6eb8 100644
--- a/awk.h
+++ b/awk.h
@@ -1323,8 +1323,12 @@ extern const wchar_t *wstrstr(const wchar_t *haystack, size_t hs_len,
 extern const wchar_t *wcasestrstr(const wchar_t *haystack, size_t hs_len,
 		const wchar_t *needle, size_t needle_len);
 extern void free_wstr(NODE *n);
+extern wint_t btowc_cache[];
+extern void init_btowc_cache();
+#define is_valid_character(b)	(btowc_cache[b] != WEOF)
 #else
 #define free_wstr(NODE)	/* empty */
+#define is_valid_character(c)	(TRUE)
 #endif
 /* re.c */
 extern Regexp *make_regexp(const char *s, size_t len, int ignorecase, int dfa, int canfatal);