wpa_supplicant: sort scan results by link quality to improve supplicant-controlled roaming

SVN-Revision: 11931

package/wpa_supplicant/patches/140-quality.patch

+Index: wpa_supplicant-0.6.3/wpa_supplicant/wpa_supplicant.c
+===================================================================
+--- wpa_supplicant-0.6.3.orig/wpa_supplicant/wpa_supplicant.c	2008-07-24 16:28:58.000000000 +0200
++++ wpa_supplicant-0.6.3/wpa_supplicant/wpa_supplicant.c	2008-07-24 16:47:40.000000000 +0200
+@@ -1182,7 +1182,7 @@
+ {
+ #define SCAN_AP_LIMIT 128
+ 	struct wpa_scan_result *results;
+-	int num, i;
++	int num, i, j;
+ 	struct wpa_scan_results *res;
+ 
+ 	results = os_malloc(SCAN_AP_LIMIT * sizeof(struct wpa_scan_result));
+@@ -1279,6 +1279,21 @@
+ 		res->res[res->num++] = r;
+ 	}
+ 
++	/* sort scan results by quality */
++	for(i = 0; i < num - 1; i++) {
++		for(j = i + 1; j < num; j++) {
++			struct wpa_scan_result tmp;
++
++			if (results[i].qual > results[j].qual)
++				continue;
++
++			os_memcpy(&tmp, &results[i], sizeof(tmp));
++			os_memcpy(&results[i], &results[j], sizeof(tmp));
++			os_memcpy(&results[j], &tmp, sizeof(tmp));
++		}
++	}
++
++
+ 	os_free(results);
+ 	wpa_s->scan_res = res;
+