Avoid stdlib, this saves 145 bytes

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>

1 files changed, 11 insertions, 2 deletions

diff --git a/crda.c b/crda.c
index 681ff73..97e1f53 100644
--- a/crda.c
+++ b/crda.c
@@ -6,7 +6,6 @@
 
 #include <errno.h>
 #include <stdio.h>
-#include <stdlib.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -95,9 +94,19 @@ static int error_handler(struct sockaddr_nl __attribute__((unused)) *nla,
 	exit(err->error);
 }
 
+/* Avoid stdlib */
+static int is_len_2(const char *alpha2)
+{
+        if (alpha2[0] == '\0' || (alpha2[1] == '\0'))
+                return 0;
+        if (alpha2[2] == '\0')
+                return 1;
+        return 0;
+}
+
 static int is_valid_regdom(const char *alpha2)
 {
-	if (strlen(alpha2) != 2)
+	if (!is_len_2(alpha2))
 		return 0;
 
 	if (!is_alpha2(alpha2) && !is_world_regdom(alpha2))