mgcp-client: Sanitize implementation of mgcp_client_rtpbridge_wildcard

* Get rid of string define containing printf statements
* Split name from rest of checks to easily add new names later

Change-Id: I46e05a7a3432733976760bbf1c5deb4f7610db11
diff --git a/src/libosmo-mgcp-client/mgcp_client.c b/src/libosmo-mgcp-client/mgcp_client.c
index 17f40b9..2dcab62 100644
--- a/src/libosmo-mgcp-client/mgcp_client.c
+++ b/src/libosmo-mgcp-client/mgcp_client.c
@@ -828,16 +828,15 @@
 	return mgcp->actual.endpoint_domain_name[0] ? mgcp->actual.endpoint_domain_name : "mgw";
 }
 
-const char *mgcp_client_rtpbridge_wildcard(const struct mgcp_client *mgcp)
+static const char *_mgcp_client_name_append_domain(const struct mgcp_client *mgcp, char *name)
 {
 	static char endpoint[MGCP_ENDPOINT_MAXLEN];
 	int rc;
 
-#define RTPBRIDGE_WILDCARD_FMT "rtpbridge/*@%s"
-	rc = snprintf(endpoint, sizeof(endpoint), RTPBRIDGE_WILDCARD_FMT, mgcp_client_endpoint_domain(mgcp));
+	rc = snprintf(endpoint, sizeof(endpoint), "%s@%s", name, mgcp_client_endpoint_domain(mgcp));
 	if (rc > sizeof(endpoint) - 1) {
-		LOGP(DLMGCP, LOGL_ERROR, "MGCP endpoint exceeds maximum length of %zu: '" RTPBRIDGE_WILDCARD_FMT "'\n",
-		     sizeof(endpoint) - 1, mgcp_client_endpoint_domain(mgcp));
+		LOGP(DLMGCP, LOGL_ERROR, "MGCP endpoint exceeds maximum length of %zu: '%s@%s'\n",
+		     sizeof(endpoint) - 1, name, mgcp_client_endpoint_domain(mgcp));
 		return NULL;
 	}
 	if (rc < 1) {
@@ -847,6 +846,11 @@
 	return endpoint;
 }
 
+const char *mgcp_client_rtpbridge_wildcard(const struct mgcp_client *mgcp)
+{
+	return _mgcp_client_name_append_domain(mgcp, "rtpbridge/*");
+}
+
 struct mgcp_response_pending * mgcp_client_pending_add(
 					struct mgcp_client *mgcp,
 					mgcp_trans_id_t trans_id,