--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/list.c	Mon Nov 21 19:52:28 2011 +0800
@@ -0,0 +1,49 @@
+#include "options.h"
+#include "dbutil.h"
+#include "list.h"
+
+void list_append(m_list *list, void *item) {
+	m_list_elem *elem;
+	
+	elem = m_malloc(sizeof(*elem));
+	elem->item = item;
+	elem->list = list;
+	elem->next = NULL;
+	if (!list->first) {
+		list->first = elem;
+		elem->prev = NULL;
+	} else {
+		elem->prev = list->last;
+		list->last->next = elem;
+	}
+	list->last = elem;
+}
+
+m_list * list_new() {
+	m_list *ret = m_malloc(sizeof(m_list));
+	ret->first = ret->last = NULL;
+	return ret;
+}
+
+void * list_remove(m_list_elem *elem) {
+	void *item = elem->item;
+	m_list *list = elem->list;
+	if (list->first == elem)
+	{
+		list->first = elem->next;
+	}
+	if (list->last == elem)
+	{
+		list->last = elem->prev;
+	}
+	if (elem->prev)
+	{
+		elem->prev->next = elem->next;
+	}
+	if (elem->next)
+	{
+		elem->next->prev = elem->prev;
+	}
+	m_free(elem);
+	return item;
+}