1 files changed, 9 insertions, 1 deletions
diff --git a/src/ctype/iswalpha.c b/src/ctype/iswalpha.c
index 0f031eac..4007c8a6 100644
--- a/src/ctype/iswalpha.c
+++ b/src/ctype/iswalpha.c
@@ -1,6 +1,14 @@
 #include <wctype.h>
 
+static unsigned char table[] = {
+#include "alpha.h"
+};
+
 int iswalpha(wint_t wc)
 {
-	return (32U|wc)-'a'<26;
+	if (wc<0x20000U)
+		return (table[table[wc>>8]*32+((wc&255)>>3)]>>(wc&7))&1;
+	if (wc<0x2fffeU)
+		return 1;
+	return 0;
 }