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+/* Copyright (C) 2017 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+/*!
+ * \file
+ *
+ * \brief A general purpose lookup table.
+ *
+ * \addtogroup libknot
+ * @{
+ */
+
+#pragma once
+
+#include <string.h>
+#include <strings.h>
+
+/*!
+ * \brief A general purpose lookup table.
+ */
+typedef struct knot_lookup {
+ int id;
+ const char *name;
+} knot_lookup_t;
+
+/*!
+ * \brief Looks up the given name in the lookup table.
+ *
+ * \param table Lookup table.
+ * \param name Name to look up.
+ *
+ * \return Item in the lookup table with the given name or NULL if no such is
+ * present.
+ */
+inline static const knot_lookup_t *knot_lookup_by_name(const knot_lookup_t *table, const char *name)
+{
+ if (table == NULL || name == NULL) {
+ return NULL;
+ }
+
+ while (table->name != NULL) {
+ if (strcasecmp(name, table->name) == 0) {
+ return table;
+ }
+ table++;
+ }
+
+ return NULL;
+}
+
+/*!
+ * \brief Looks up the given id in the lookup table.
+ *
+ * \param table Lookup table.
+ * \param id ID to look up.
+ *
+ * \return Item in the lookup table with the given id or NULL if no such is
+ * present.
+ */
+inline static const knot_lookup_t *knot_lookup_by_id(const knot_lookup_t *table, int id)
+{
+ if (table == NULL) {
+ return NULL;
+ }
+
+ while (table->name != NULL) {
+ if (table->id == id) {
+ return table;
+ }
+ table++;
+ }
+
+ return NULL;
+}
+
+/*! @} */