best way to test for integer in [16;31]

2019-04-23 14:19:31 +02:00 · 2019-04-23 14:19:31 +02:00 · f3a567cedf
parent 60ed85fe70
commit f3a567cedf
1 changed files with 1 additions and 2 deletions
--- a/miniupnpc/miniupnpc.c
+++ b/miniupnpc/miniupnpc.c
@ -85,8 +85,7 @@ static int is_rfc1918addr(const char * addr)
 		return 1;
 	/* 172.16.0.0      -   172.31.255.255  (172.16/12 prefix) */
 	if(COMPARE(addr, "172.")) {
-		int i = atoi(addr + 4);
-		if((16 <= i) && (i <= 31))
+		if((atoi(addr + 4) | 0x0f) == 0x1f)
 			return 1;
 	}
 	return 0;