1 files changed, 126 insertions, 0 deletions
diff --git a/src/backend/catalog/namespace.c b/src/backend/catalog/namespace.c
new file mode 100644
index 00000000000..c9d8d21f929
--- /dev/null
+++ b/src/backend/catalog/namespace.c
@@ -0,0 +1,126 @@
+/*-------------------------------------------------------------------------
+ *
+ * namespace.c
+ *	  code to support accessing and searching namespaces
+ *
+ * This is separate from pg_namespace.c, which contains the routines that
+ * directly manipulate the pg_namespace system catalog.  This module
+ * provides routines associated with defining a "namespace search path"
+ * and implementing search-path-controlled searches.
+ *
+ *
+ * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  $Header: /cvsroot/pgsql/src/backend/catalog/namespace.c,v 1.1 2002/03/26 19:15:32 tgl Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "catalog/namespace.h"
+#include "catalog/pg_namespace.h"
+#include "miscadmin.h"
+#include "utils/lsyscache.h"
+#include "utils/syscache.h"
+
+
+/*
+ * RangeVarGetRelid
+ *		Given a RangeVar describing an existing relation,
+ *		select the proper namespace and look up the relation OID.
+ *
+ * If the relation is not found, return InvalidOid if failOK = true,
+ * otherwise raise an error.
+ */
+Oid
+RangeVarGetRelid(const RangeVar *relation, bool failOK)
+{
+	Oid			namespaceId;
+	Oid			relId;
+
+	/*
+	 * We check the catalog name and then ignore it.
+	 */
+	if (relation->catalogname)
+	{
+		if (strcmp(relation->catalogname, DatabaseName) != 0)
+			elog(ERROR, "Cross-database references are not implemented");
+	}
+
+	if (relation->schemaname)
+	{
+		namespaceId = GetSysCacheOid(NAMESPACENAME,
+									 CStringGetDatum(relation->schemaname),
+									 0, 0, 0);
+		if (!OidIsValid(namespaceId))
+			elog(ERROR, "Namespace \"%s\" does not exist",
+				 relation->schemaname);
+		relId = get_relname_relid(relation->relname, namespaceId);
+	}
+	else
+	{
+		relId = RelnameGetRelid(relation->relname);
+	}
+
+	if (!OidIsValid(relId) && !failOK)
+	{
+		if (relation->schemaname)
+			elog(ERROR, "Relation \"%s\".\"%s\" does not exist",
+				 relation->schemaname, relation->relname);
+		else
+			elog(ERROR, "Relation \"%s\" does not exist",
+				 relation->relname);
+	}
+	return relId;
+}
+
+/*
+ * RangeVarGetCreationNamespace
+ *		Given a RangeVar describing a to-be-created relation,
+ *		choose which namespace to create it in.
+ */
+Oid
+RangeVarGetCreationNamespace(const RangeVar *newRelation)
+{
+	Oid			namespaceId;
+
+	/*
+	 * We check the catalog name and then ignore it.
+	 */
+	if (newRelation->catalogname)
+	{
+		if (strcmp(newRelation->catalogname, DatabaseName) != 0)
+			elog(ERROR, "Cross-database references are not implemented");
+	}
+
+	if (newRelation->schemaname)
+	{
+		namespaceId = GetSysCacheOid(NAMESPACENAME,
+									 CStringGetDatum(newRelation->schemaname),
+									 0, 0, 0);
+		if (!OidIsValid(namespaceId))
+			elog(ERROR, "Namespace \"%s\" does not exist",
+				 newRelation->schemaname);
+	}
+	else
+	{
+		/* XXX Wrong!  Need to get a default schema from somewhere */
+		namespaceId = PG_CATALOG_NAMESPACE;
+	}
+
+	return namespaceId;
+}
+
+/*
+ * RelnameGetRelid
+ *		Try to resolve an unqualified relation name.
+ *		Returns OID if relation found in search path, else InvalidOid.
+ */
+Oid
+RelnameGetRelid(const char *relname)
+{
+	/* XXX Wrong!  must search search path */
+	return get_relname_relid(relname, PG_CATALOG_NAMESPACE);
+}