--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/arogue7/list.c	Fri May 08 15:24:40 2015 -0400
@@ -0,0 +1,226 @@
+/*
+ * list.c  -  Functions for dealing with linked lists of goodies
+ *
+ * Advanced Rogue
+ * Copyright (C) 1984, 1985, 1986 Michael Morgan, Ken Dalka and AT&T
+ * All rights reserved.
+ *
+ * Based on "Rogue: Exploring the Dungeons of Doom"
+ * Copyright (C) 1980, 1981 Michael Toy, Ken Arnold and Glenn Wichman
+ * All rights reserved.
+ *
+ * See the file LICENSE.TXT for full copyright and licensing information.
+ */
+
+/*
+ * Functions for dealing with linked lists of goodies
+ *
+ */
+
+#include "curses.h"
+#include <stdlib.h>
+#include "rogue.h"
+
+/*
+ * detach:
+ *	Takes an item out of whatever linked list it might be in
+ */
+
+_detach(list, item)
+register struct linked_list **list, *item;
+{
+    if (*list == item)
+	*list = next(item);
+    if (prev(item) != NULL) item->l_prev->l_next = next(item);
+    if (next(item) != NULL) item->l_next->l_prev = prev(item);
+    item->l_next = NULL;
+    item->l_prev = NULL;
+}
+
+/*
+ * _attach:
+ *	add an item to the head of a list
+ */
+
+_attach(list, item)
+register struct linked_list **list, *item;
+{
+    if (*list != NULL)
+    {
+	item->l_next = *list;
+	(*list)->l_prev = item;
+	item->l_prev = NULL;
+    }
+    else
+    {
+	item->l_next = NULL;
+	item->l_prev = NULL;
+    }
+
+    *list = item;
+}
+
+/*
+ * o_free_list:
+ *	Throw the whole object list away
+ */
+
+_o_free_list(ptr)
+register struct linked_list **ptr;
+{
+    register struct linked_list *item;
+
+    while (*ptr != NULL)
+    {
+	item = *ptr;
+	*ptr = next(item);
+	o_discard(item);
+    }
+}
+
+/*
+ * o_discard:
+ *	free up an item and its object(and maybe contents)
+ */
+
+o_discard(item)
+register struct linked_list *item;
+{
+    register struct object *obj;
+
+    obj = OBJPTR(item);
+    if (obj->contents != NULL)
+	o_free_list(obj->contents);
+    total -= 2;
+    FREE(obj);
+    FREE(item);
+}
+
+/*
+ * r_free_list:
+ *	Throw the whole list of room exits away
+ */
+
+_r_free_list(ptr)
+register struct linked_list **ptr;
+{
+    register struct linked_list *item;
+
+    while (*ptr != NULL)
+    {
+	item = *ptr;
+	*ptr = next(item);
+	r_discard(item);
+    }
+}
+
+/*
+ * r_discard:
+ *	free up an item and its room
+ */
+
+r_discard(item)
+register struct linked_list *item;
+{
+    total -= 2;
+    FREE(DOORPTR(item));
+    FREE(item);
+}
+
+/*
+ * t_free_list:
+ *	Throw the whole thing list away
+ */
+
+_t_free_list(ptr)
+register struct linked_list **ptr;
+{
+    register struct linked_list *item;
+
+    while (*ptr != NULL)
+    {
+	item = *ptr;
+	*ptr = next(item);
+	t_discard(item);
+    }
+}
+
+/*
+ * t_discard:
+ *	free up an item and its thing
+ */
+
+t_discard(item)
+register struct linked_list *item;
+{
+    register struct thing *tp;
+
+    total -= 2;
+    tp = THINGPTR(item);
+    if (tp->t_name != NULL) FREE(tp->t_name);
+    FREE(tp);
+    FREE(item);
+}
+
+/*
+ * destroy_item:
+ *	get rid of an item structure -- don't worry about contents
+ */
+
+destroy_item(item)
+register struct linked_list *item;
+{
+    total--;
+    FREE(item);
+}
+
+/*
+ * new_item
+ *	get a new item with a specified size
+ */
+
+struct linked_list *
+new_item(size)
+int size;
+{
+    register struct linked_list *item;
+
+    if ((item = (struct linked_list *) new(sizeof *item)) == NULL)
+	msg("Ran out of memory for header after %d items", total);
+    if ((item->l_data = new(size)) == NULL)
+	msg("Ran out of memory for data after %d items", total);
+    item->l_next = item->l_prev = NULL;
+    return item;
+}
+
+/*
+ * creat_item:
+ *	Create just an item structure -- don't make any contents
+ */
+
+struct linked_list *
+creat_item()
+{
+    register struct linked_list *item;
+
+    if ((item = (struct linked_list *) new(sizeof *item)) == NULL)
+	msg("Ran out of memory for header after %d items", total);
+    item->l_next = item->l_prev = NULL;
+    return item;
+}
+
+char *
+new(size)
+int size;
+{
+    register char *space = ALLOC(size);
+    static char errbuf[LINELEN];
+
+    if (space == NULL) {
+	sprintf(errbuf,"Rogue ran out of memory (used = %d, wanted = %d).",
+		md_memused(), size);
+	fatal(errbuf);
+    }
+    total++;
+    return space;
+}