From 9bca11727451f364f180758b46051a8e0398bccd Mon Sep 17 00:00:00 2001
From: Sander Vrijders <sander.vrijders@intec.ugent.be>
Date: Mon, 14 Mar 2016 10:30:55 +0100
Subject: lib: Move list function definitions into a source file
This moves the function definitions of list.h into a separate source
file to avod linker errors when including the file in more than one
source file.
---
src/lib/CMakeLists.txt | 1 +
src/lib/list.c | 125 +++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 126 insertions(+)
create mode 100644 src/lib/list.c
(limited to 'src')
diff --git a/src/lib/CMakeLists.txt b/src/lib/CMakeLists.txt
index c52a5609..589c8769 100644
--- a/src/lib/CMakeLists.txt
+++ b/src/lib/CMakeLists.txt
@@ -12,6 +12,7 @@ set(SOURCE_FILES
du_buff.c
ipcp.c
irm.c
+ list.c
rina_name.c
sockets.c
)
diff --git a/src/lib/list.c b/src/lib/list.c
new file mode 100644
index 00000000..75063e22
--- /dev/null
+++ b/src/lib/list.c
@@ -0,0 +1,125 @@
+/*
+ * Ouroboros - Copyright (C) 2016
+ *
+ * Simple doubly linked list implementation.
+ *
+ * Some of the internal functions ("__xxx") are useful when
+ * manipulating whole lists rather than single entries, as
+ * sometimes we already know the next/prev entries and we can
+ * generate better code by using them directly rather than
+ * using the generic single-entry routines.
+ *
+ * This file is from the Linux Kernel (include/linux/list.h)
+ * and modified by simply removing hardware prefetching of list items.
+ * Here by copyright, credits attributed to wherever they belong.
+ * Kulesh Shanmugasundaram (kulesh [squiggly] isis.poly.edu)
+ *
+ * Sander Vrijders <sander.vrijders@intec.ugent.be>
+ *
+ * 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 2 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <ouroboros/list.h>
+
+static void __list_add(struct list_head * new,
+ struct list_head * prev,
+ struct list_head * next)
+{
+ next->prev = new;
+ new->next = next;
+ new->prev = prev;
+ prev->next = new;
+}
+
+void list_add(struct list_head * new,
+ struct list_head * head)
+{
+ __list_add(new, head, head->next);
+}
+
+void list_add_tail(struct list_head * new,
+ struct list_head * head)
+{
+ __list_add(new, head->prev, head);
+}
+
+static void __list_del(struct list_head * prev,
+ struct list_head * next)
+{
+ next->prev = prev;
+ prev->next = next;
+}
+
+void list_del(struct list_head * entry)
+{
+ __list_del(entry->prev, entry->next);
+ entry->next = (void *) 0;
+ entry->prev = (void *) 0;
+}
+
+void list_del_init(struct list_head * entry)
+{
+ __list_del(entry->prev, entry->next);
+ INIT_LIST_HEAD(entry);
+}
+
+void list_move(struct list_head * list,
+ struct list_head * head)
+{
+ __list_del(list->prev, list->next);
+ list_add(list, head);
+}
+
+void list_move_tail(struct list_head * list,
+ struct list_head * head)
+{
+ __list_del(list->prev, list->next);
+ list_add_tail(list, head);
+}
+
+int list_empty(struct list_head * head)
+{
+ return head->next == head;
+}
+
+static void __list_splice(struct list_head *list,
+ struct list_head *head)
+{
+ struct list_head *first = list->next;
+ struct list_head *last = list->prev;
+ struct list_head *at = head->next;
+
+ first->prev = head;
+ head->next = first;
+
+ last->next = at;
+ at->prev = last;
+}
+
+void list_splice(struct list_head * list,
+ struct list_head * head)
+{
+ if (!list_empty(list))
+ __list_splice(list, head);
+}
+
+void list_splice_init(struct list_head * list,
+ struct list_head * head)
+{
+ if (!list_empty(list)) {
+ __list_splice(list, head);
+ INIT_LIST_HEAD(list);
+ }
+}
--
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