introduce LONE_CHAR (optimized strcmp with one-char string)

networking/inetd.c

@@ -759,7 +759,7 @@ static servtab_t *getconfigent(void)
 	while (nsep != NULL) {
 		nsep->se_checked = 1;
 		if (nsep->se_family == AF_INET) {
-			if (!strcmp(nsep->se_hostaddr, "*"))
+			if (LONE_CHAR(nsep->se_hostaddr, '*'))
 				nsep->se_ctrladdr_in.sin_addr.s_addr = INADDR_ANY;
 			else if (!inet_aton(nsep->se_hostaddr, &nsep->se_ctrladdr_in.sin_addr)) {
 				struct hostent *hp;

networking/libiproute/ipaddress.c

@@ -678,7 +678,7 @@ static int ipaddr_modify(int cmd, int argc, char **argv)
 				if (brd_len) {
 					duparg("broadcast", *argv);
 				}
-				if (strcmp(*argv, "+") == 0) {
+				if (LONE_CHAR(*argv, '+')) {
 					brd_len = -1;
 				}
 				else if (LONE_DASH(*argv)) {