From 528ec099b1e369e8f91342c9d3a421646e34ef1a Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Mon, 22 Aug 2016 14:28:57 +0200
Subject: socket: use isdigit

---
 src/socket.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'src/socket.c')

diff --git a/src/socket.c b/src/socket.c
index aa17c1b..4720d4a 100644
--- a/src/socket.c
+++ b/src/socket.c
@@ -5,6 +5,7 @@
 #include "packets.h"
 #include "messages.h"
 
+#include <linux/ctype.h>
 #include <linux/net.h>
 #include <linux/if_vlan.h>
 #include <linux/if_ether.h>
@@ -364,7 +365,7 @@ static uint16_t generate_default_incoming_port(struct wireguard_device *wg)
 		return port;
 	digit_begin = name + len - 1;
 	while (digit_begin >= name) {
-		if (*digit_begin >= '0' && *digit_begin <= '9')
+		if (isdigit(*digit_begin))
 			--digit_begin;
 		else
 			break;
-- 
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