wireless: consolidate on a single escape_essid implementation

Signed-off-by: John W. Linville <linville@tuxdriver.com>

include/net/lib80211.h

@@ -0,0 +1,31 @@
+/*
+ * lib80211.h -- common bits for IEEE802.11 wireless drivers
+ *
+ * Copyright (c) 2008, John W. Linville <linville@tuxdriver.com>
+ *
+ */
+
+#ifndef LIB80211_H
+#define LIB80211_H
+
+/* escape_ssid() is intended to be used in debug (and possibly error)
+ * messages. It should never be used for passing ssid to user space. */
+const char *escape_ssid(const char *ssid, u8 ssid_len);
+
+static inline int is_empty_ssid(const char *ssid, int ssid_len)
+{
+	/* Single white space is for Linksys APs */
+	if (ssid_len == 1 && ssid[0] == ' ')
+		return 1;
+
+	/* Otherwise, if the entire ssid is 0, we assume it is hidden */
+	while (ssid_len) {
+		ssid_len--;
+		if (ssid[ssid_len] != '\0')
+			return 0;
+	}
+
+	return 1;
+}
+
+#endif /* LIB80211_H */