[PATCH 4/8] network: use util_exponential_decay

[James Prestwood <prestwoj@gmail.com>]

---
 src/network.c | 35 ++++-------------------------------
 1 file changed, 4 insertions(+), 31 deletions(-)

diff --git a/src/network.c b/src/network.c
index cd8b0ee9..0a40a6c5 100644
--- a/src/network.c
+++ b/src/network.c
@@ -56,6 +56,7 @@
 #include "src/erp.h"
 #include "src/handshake.h"
 #include "src/band.h"
+#include "src/util.h"
 
 #define SAE_PT_SETTING "SAE-PT-Group%u"
 
@@ -212,31 +213,10 @@ void network_disconnected(struct network *network)
 		station_hide_network(network->station, network);
 }
 
-/* First 64 entries calculated by 1 / pow(n, 0.3) for n >= 1 */
-static const double rankmod_table[] = {
-	1.0000000000, 0.8122523964, 0.7192230933, 0.6597539554,
-	0.6170338627, 0.5841906811, 0.5577898253, 0.5358867313,
-	0.5172818580, 0.5011872336, 0.4870596972, 0.4745102806,
-	0.4632516708, 0.4530661223, 0.4437850034, 0.4352752816,
-	0.4274303178, 0.4201634287, 0.4134032816, 0.4070905315,
-	0.4011753236, 0.3956154062, 0.3903746872, 0.3854221125,
-	0.3807307877, 0.3762772797, 0.3720410580, 0.3680040435,
-	0.3641502401, 0.3604654325, 0.3569369365, 0.3535533906,
-	0.3503045821, 0.3471812999, 0.3441752105, 0.3412787518,
-	0.3384850430, 0.3357878061, 0.3331812996, 0.3306602598,
-	0.3282198502, 0.3258556179, 0.3235634544, 0.3213395618,
-	0.3191804229, 0.3170827751, 0.3150435863, 0.3130600345,
-	0.3111294892, 0.3092494947, 0.3074177553, 0.3056321221,
-	0.3038905808, 0.3021912409, 0.3005323264, 0.2989121662,
-	0.2973291870, 0.2957819051, 0.2942689208, 0.2927889114,
-	0.2913406263, 0.2899228820, 0.2885345572, 0.2871745887,
-};
-
 bool network_rankmod(const struct network *network, double *rankmod)
 {
 	struct network_info *info = network->info;
 	int n;
-	int nmax;
 
 	/*
 	 * Current policy is that only networks successfully connected
@@ -250,12 +230,7 @@ bool network_rankmod(const struct network *network, double *rankmod)
 	if (n < 0)
 		return false;
 
-	nmax = L_ARRAY_SIZE(rankmod_table);
-
-	if (n >= nmax)
-		n = nmax - 1;
-
-	*rankmod = rankmod_table[n];
+	*rankmod = util_exponential_decay(n);
 
 	return true;
 }
@@ -2018,10 +1993,8 @@ void network_rank_update(struct network *network, bool connected)
 
 		L_WARN_ON(n < 0);
 
-		if (n >= (int) L_ARRAY_SIZE(rankmod_table))
-			n = L_ARRAY_SIZE(rankmod_table) - 1;
-
-		network->rank = rankmod_table[n] * best_bss->rank + USHRT_MAX;
+		network->rank =
+			util_exponential_decay(n) * best_bss->rank + USHRT_MAX;
 	} else
 		network->rank = best_bss->rank;
 
-- 
2.34.1