[PATCHv9 2/5] Import linked list helpers from the intel DDX.

[Francisco Jerez]

Borrowed from i830.h, except for list_for_each_entry().

Signed-off-by: Francisco Jerez <currojerez at riseup.net>
---
 include/Makefile.am |    1 +
 include/list.h      |  101 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 102 insertions(+), 0 deletions(-)
 create mode 100644 include/list.h

diff --git a/include/Makefile.am b/include/Makefile.am
index d684f9c..eddc86c 100644
--- a/include/Makefile.am
+++ b/include/Makefile.am
@@ -27,6 +27,7 @@ sdk_HEADERS =		\
 	globals.h	\
 	input.h		\
 	inputstr.h	\
+	list.h		\
 	misc.h		\
 	miscstruct.h	\
 	opaque.h	\
diff --git a/include/list.h b/include/list.h
new file mode 100644
index 0000000..6369e56
--- /dev/null
+++ b/include/list.h
@@ -0,0 +1,101 @@
+/**************************************************************************
+
+Copyright 1998-1999 Precision Insight, Inc., Cedar Park, Texas.
+Copyright © 2002 David Dawes
+
+All Rights Reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sub license, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice (including the
+next paragraph) shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+IN NO EVENT SHALL PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR
+ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+**************************************************************************/
+
+#ifndef _LIST_H_
+#define _LIST_H_
+
+/* classic doubly-link circular list */
+struct list {
+	struct list *next, *prev;
+};
+
+static void
+list_init(struct list *list)
+{
+	list->next = list->prev = list;
+}
+
+static inline void
+__list_add(struct list *entry,
+	    struct list *prev,
+	    struct list *next)
+{
+	next->prev = entry;
+	entry->next = next;
+	entry->prev = prev;
+	prev->next = entry;
+}
+
+static inline void
+list_add(struct list *entry, struct list *head)
+{
+	__list_add(entry, head, head->next);
+}
+
+static inline void
+__list_del(struct list *prev, struct list *next)
+{
+	next->prev = prev;
+	prev->next = next;
+}
+
+static inline void
+list_del(struct list *entry)
+{
+	__list_del(entry->prev, entry->next);
+	list_init(entry);
+}
+
+static inline Bool
+list_is_empty(struct list *head)
+{
+	return head->next == head;
+}
+
+#ifndef container_of
+#define container_of(ptr, type, member) \
+	(type *)((char *)(ptr) - (char *) &((type *)0)->member)
+#endif
+
+#define list_entry(ptr, type, member) \
+	container_of(ptr, type, member)
+
+#define list_first_entry(ptr, type, member) \
+	list_entry((ptr)->next, type, member)
+
+#define __container_of(ptr, sample, member)				\
+	(void *)((char *)(ptr)						\
+		 - ((char *)&(sample)->member - (char *)(sample)))
+
+#define list_for_each_entry(pos, head, member)				\
+	for (pos = __container_of((head)->next, pos, member);		\
+	     &pos->member != (head);					\
+	     pos = __container_of(pos->member.next, pos, member))
+
+#endif
-- 
1.6.4.4