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authorMike Frysinger2005-05-09 22:10:42 +0000
committerMike Frysinger2005-05-09 22:10:42 +0000
commit1fd98e039d146dcff02a5350f509cabca65fd29c (patch)
tree1564707d41a6271bb44cf3fa5b88b9cc70fedd35 /e2fsprogs/ext2fs/kernel-list.h
parentb32011943a0764872ca1ea17f13b53176ace8e69 (diff)
downloadbusybox-1fd98e039d146dcff02a5350f509cabca65fd29c.zip
busybox-1fd98e039d146dcff02a5350f509cabca65fd29c.tar.gz
import ext2fs lib to prep for new e2fsprogs
Diffstat (limited to 'e2fsprogs/ext2fs/kernel-list.h')
-rw-r--r--e2fsprogs/ext2fs/kernel-list.h112
1 files changed, 112 insertions, 0 deletions
diff --git a/e2fsprogs/ext2fs/kernel-list.h b/e2fsprogs/ext2fs/kernel-list.h
new file mode 100644
index 0000000..24e6ab4
--- /dev/null
+++ b/e2fsprogs/ext2fs/kernel-list.h
@@ -0,0 +1,112 @@
+#ifndef _LINUX_LIST_H
+#define _LINUX_LIST_H
+
+/*
+ * 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.
+ */
+
+struct list_head {
+ struct list_head *next, *prev;
+};
+
+#define LIST_HEAD_INIT(name) { &(name), &(name) }
+
+#define LIST_HEAD(name) \
+ struct list_head name = { &name, &name }
+
+#define INIT_LIST_HEAD(ptr) do { \
+ (ptr)->next = (ptr); (ptr)->prev = (ptr); \
+} while (0)
+
+#if (!defined(__GNUC__) && !defined(__WATCOMC__))
+#define __inline__
+#endif
+
+/*
+ * Insert a new entry between two known consecutive entries.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static __inline__ 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;
+}
+
+/*
+ * Insert a new entry after the specified head..
+ */
+static __inline__ void list_add(struct list_head *new, struct list_head *head)
+{
+ __list_add(new, head, head->next);
+}
+
+/*
+ * Insert a new entry at the tail
+ */
+static __inline__ void list_add_tail(struct list_head *new, struct list_head *head)
+{
+ __list_add(new, head->prev, head);
+}
+
+/*
+ * Delete a list entry by making the prev/next entries
+ * point to each other.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static __inline__ void __list_del(struct list_head * prev,
+ struct list_head * next)
+{
+ next->prev = prev;
+ prev->next = next;
+}
+
+static __inline__ void list_del(struct list_head *entry)
+{
+ __list_del(entry->prev, entry->next);
+}
+
+static __inline__ int list_empty(struct list_head *head)
+{
+ return head->next == head;
+}
+
+/*
+ * Splice in "list" into "head"
+ */
+static __inline__ void list_splice(struct list_head *list, struct list_head *head)
+{
+ struct list_head *first = list->next;
+
+ if (first != list) {
+ struct list_head *last = list->prev;
+ struct list_head *at = head->next;
+
+ first->prev = head;
+ head->next = first;
+
+ last->next = at;
+ at->prev = last;
+ }
+}
+
+#define list_entry(ptr, type, member) \
+ ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
+
+#define list_for_each(pos, head) \
+ for (pos = (head)->next; pos != (head); pos = pos->next)
+
+#endif