1 files changed, 20 insertions, 5 deletions
diff --git a/lib/libc/regex/regcomp.c b/lib/libc/regex/regcomp.c
index ba803130a050..89b96b00fefb 100644
--- a/lib/libc/regex/regcomp.c
+++ b/lib/libc/regex/regcomp.c
@@ -1586,17 +1586,32 @@ singleton(cset *cs)
 {
 	wint_t i, s, n;
 
+	/* Exclude the complicated cases we don't want to deal with */
+	if (cs->nranges != 0 || cs->ntypes != 0 || cs->icase != 0)
+		return (OUT);
+
+	if (cs->nwides > 1)
+		return (OUT);
+
+	/* Count the number of characters present in the bitmap */
 	for (i = n = 0; i < NC; i++)
 		if (CHIN(cs, i)) {
 			n++;
 			s = i;
 		}
-	if (n == 1)
-		return (s);
-	if (cs->nwides == 1 && cs->nranges == 0 && cs->ntypes == 0 &&
-	    cs->icase == 0)
+
+	if (n > 1)
+		return (OUT);
+
+	if (n == 1) {
+		if (cs->nwides == 0)
+			return (s);
+		else
+			return (OUT);
+	}
+	if (cs->nwides == 1)
 		return (cs->wides[0]);
-	/* Don't bother handling the other cases. */
+
 	return (OUT);
 }