util: Add util_ssid_is_utf8

src/util.c

@@ -78,6 +78,14 @@ no_ssid:
 	return buf;
 }
 
+bool util_ssid_is_utf8(size_t len, const uint8_t *ssid)
+{
+	if (len > 32)
+		return false;
+
+	return l_utf8_validate((const char *)ssid, len, NULL);
+}
+
 bool _msg_append_attr(struct l_genl_msg *msg,
 			uint16_t type, const char *type_str,
 			uint16_t len, const void *value)

src/util.h

@@ -27,6 +27,7 @@
 #include <unistd.h>
 
 const char *util_ssid_to_utf8(size_t len, const uint8_t *ssid);
+bool util_ssid_is_utf8(size_t len, const uint8_t *ssid);
 
 static inline uint8_t util_bit_field(const uint8_t oct, int start, int num)
 {