Add const to callsign input argument

eth_ar.c

@@ -41,7 +41,7 @@ static char alnum2code[37] = {
 	0
 };
 
-int eth_ar_call2mac(uint8_t mac[6], char *callsign, int ssid, bool multicast)
+int eth_ar_call2mac(uint8_t mac[6], const char *callsign, int ssid, bool multicast)
 {
 	uint64_t add = 0;
 	int i;
@@ -81,7 +81,7 @@ int eth_ar_call2mac(uint8_t mac[6], char *callsign, int ssid, bool multicast)
 	return 0;
 }
 
-int eth_ar_callssid2mac(uint8_t mac[6], char *callsign, bool multicast)
+int eth_ar_callssid2mac(uint8_t mac[6], const char *callsign, bool multicast)
 {
 	int ssid = 0;
 	char call[9];

eth_ar/eth_ar.h

@@ -53,8 +53,8 @@ extern "C" {
 #define ETH_AR_CALL_LEN_MAX	8
 #define ETH_AR_CALL_SIZE	9
 
-int eth_ar_call2mac(uint8_t mac[ETH_AR_MAC_SIZE], char *callsign, int ssid, bool multicast);
-int eth_ar_callssid2mac(uint8_t mac[ETH_AR_MAC_SIZE], char *callsign, bool multicast);
+int eth_ar_call2mac(uint8_t mac[ETH_AR_MAC_SIZE], const char *callsign, int ssid, bool multicast);
+int eth_ar_callssid2mac(uint8_t mac[ETH_AR_MAC_SIZE], const char *callsign, bool multicast);
 int eth_ar_mac2call(char *callsign, int *ssid, bool *multicast, uint8_t mac[ETH_AR_MAC_SIZE]);
 int eth_ar_mac_ssid_mask(uint8_t masked_mac[ETH_AR_MAC_SIZE], const uint8_t mac[ETH_AR_MAC_SIZE]);