Added modb_use to R and the c handler + moved the connection referencing to a helpers file

src/R_helpers_p.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+
+#include "R_helpers_p.h"
+#include "strext.h"
+
+struct stored_conn_t *getConnectionByRef(SEXP r_conn_ref)
+{
+  struct stored_conn_t *sconn = 0;
+
+  if (Rf_isString(r_conn_ref)) {
+    sconn = connectionByName(Rf_translateCharUTF8(STRING_ELT(r_conn_ref, 0)));
+  } else if (Rf_isInteger(r_conn_ref)) {
+    sconn = connectionById(Rf_asInteger(r_conn_ref));
+  } else {
+    Rf_error("Neither name or id provided");
+  }
+
+  return sconn;
+}