Hint parsing

server/core/hint.c

@@ -0,0 +1,136 @@
+/*
+ * This file is distributed as part of MaxScale.  It 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,
+ * version 2.
+ *
+ * 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, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Copyright SkySQL Ab 2014
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <hint.h>
+
+/**
+ * @file hint.c generic support routines for hints.
+ *
+ * @verbatim
+ * Revision History
+ *
+ * Date		Who		Description
+ * 25/07/14	Mark Riddoch	Initial implementation
+ *
+ * @endverbatim
+ */
+
+
+/**
+ * Duplicate a list of hints
+ *
+ * @param hint		The hint list to duplicate
+ * @return 	A duplicate of the list
+ */
+HINT *
+hint_dup(HINT *hint)
+{
+HINT	*nlhead = NULL, *nltail = NULL, *ptr1, *ptr2;
+
+	ptr1 = hint;
+	while (ptr1)
+	{
+		if ((ptr2 = (HINT *)malloc(sizeof(HINT))) == NULL)
+			return nlhead;
+		ptr2->type = ptr1->type;
+		if (ptr1->data)
+			ptr2->data = strdup(ptr1->data);
+		else
+			ptr2->data = NULL;
+		if (ptr1->value)
+			ptr2->value = strdup(ptr1->value);
+		else
+			ptr2->data = NULL;
+		ptr2->next = NULL;
+		if (nltail)
+		{
+			nltail->next = ptr2;
+			nltail = ptr2;
+		}
+		else
+		{
+			nlhead = ptr2;
+			nltail = ptr2;
+		}
+		ptr1 = ptr1->next;
+	}
+	return nlhead;
+}
+
+/**
+ * Create a ROUTE TO type hint
+ *
+ * @param head	The current hint list
+ * @param type	The HINT_TYPE
+ * @param data	Data may be NULL or the name of a server to route to
+ * @return The result hint list
+ */
+HINT *
+hint_create_route(HINT *head, HINT_TYPE type, char *data)
+{
+HINT	*hint;
+
+	if ((hint = (HINT *)malloc(sizeof(HINT))) == NULL)
+		return head;
+	hint->next = head;
+	hint->type = type;
+	if (data)
+		hint->data = strdup(data);
+	else
+		hint->data = NULL;
+	hint->value = NULL;
+	return hint;
+}
+
+/**
+ * Create name/value parameter hint
+ *
+ * @param head	The current hint list
+ * @param pname	The parameter name
+ * @param value	The parameter value
+ * @return The result hint list
+ */
+HINT *
+hint_create_parameter(HINT *head, char *pname, char *value)
+{
+HINT	*hint;
+
+	if ((hint = (HINT *)malloc(sizeof(HINT))) == NULL)
+		return head;
+	hint->next = head;
+	hint->type = HINT_PARAMETER;
+	hint->data = strdup(pname);
+	hint->value = strdup(value);
+	return hint;
+}
+
+/**
+ * free_hint - free a hint
+ *
+ * @param hint		The hint to free
+ */
+void
+hint_free(HINT *hint)
+{
+	if (hint->data)
+		free(hint->data);
+	if (hint->value)
+		free(hint->value);
+	free(hint);
+}