summaryrefslogtreecommitdiffstats
path: root/libblkid/list.h
diff options
context:
space:
mode:
authorbigbiff <bigbiff@teamw.in>2015-01-02 01:44:14 +0100
committerDees Troy <dees_troy@teamw.in>2015-01-05 04:38:42 +0100
commit7b4c7a681cc4c0a53dc8a8baf4853e921cfbf5de (patch)
treefb69cb515cb4ab675d5850684cc402100b7a2a22 /libblkid/list.h
parentcrypto: remove unused libs and clean up makefile (diff)
downloadandroid_bootable_recovery-7b4c7a681cc4c0a53dc8a8baf4853e921cfbf5de.tar
android_bootable_recovery-7b4c7a681cc4c0a53dc8a8baf4853e921cfbf5de.tar.gz
android_bootable_recovery-7b4c7a681cc4c0a53dc8a8baf4853e921cfbf5de.tar.bz2
android_bootable_recovery-7b4c7a681cc4c0a53dc8a8baf4853e921cfbf5de.tar.lz
android_bootable_recovery-7b4c7a681cc4c0a53dc8a8baf4853e921cfbf5de.tar.xz
android_bootable_recovery-7b4c7a681cc4c0a53dc8a8baf4853e921cfbf5de.tar.zst
android_bootable_recovery-7b4c7a681cc4c0a53dc8a8baf4853e921cfbf5de.zip
Diffstat (limited to 'libblkid/list.h')
-rw-r--r--libblkid/list.h340
1 files changed, 0 insertions, 340 deletions
diff --git a/libblkid/list.h b/libblkid/list.h
deleted file mode 100644
index 7b6067239..000000000
--- a/libblkid/list.h
+++ /dev/null
@@ -1,340 +0,0 @@
-/*
- * Copyright (C) 2008 Karel Zak <kzak@redhat.com>
- * Copyright (C) 1999-2008 by Theodore Ts'o
- *
- * This file may be redistributed under the terms of the
- * GNU Lesser General Public License.
- *
- * (based on list.h from e2fsprogs)
- * Merge sort based on kernel's implementation.
- */
-
-#ifndef UTIL_LINUX_LIST_H
-#define UTIL_LINUX_LIST_H
-
-/* TODO: use AC_C_INLINE */
-#ifdef __GNUC__
-#define _INLINE_ static __inline__
-#else /* For Watcom C */
-#define _INLINE_ static inline
-#endif
-
-/*
- * 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 = LIST_HEAD_INIT(name)
-
-#define INIT_LIST_HEAD(ptr) do { \
- (ptr)->next = (ptr); (ptr)->prev = (ptr); \
-} while (0)
-
-/*
- * Insert a new entry between two known consecutive entries.
- *
- * This is only for internal list manipulation where we know
- * the prev/next entries already!
- */
-_INLINE_ void __list_add(struct list_head * add,
- struct list_head * prev,
- struct list_head * next)
-{
- next->prev = add;
- add->next = next;
- add->prev = prev;
- prev->next = add;
-}
-
-/**
- * list_add - add a new entry
- * @add: new entry to be added
- * @head: list head to add it after
- *
- * Insert a new entry after the specified head.
- * This is good for implementing stacks.
- */
-_INLINE_ void list_add(struct list_head *add, struct list_head *head)
-{
- __list_add(add, head, head->next);
-}
-
-/**
- * list_add_tail - add a new entry
- * @add: new entry to be added
- * @head: list head to add it before
- *
- * Insert a new entry before the specified head.
- * This is useful for implementing queues.
- */
-_INLINE_ void list_add_tail(struct list_head *add, struct list_head *head)
-{
- __list_add(add, 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!
- */
-_INLINE_ void __list_del(struct list_head * prev,
- struct list_head * next)
-{
- next->prev = prev;
- prev->next = next;
-}
-
-/**
- * list_del - deletes entry from list.
- * @entry: the element to delete from the list.
- *
- * list_empty() on @entry does not return true after this, @entry is
- * in an undefined state.
- */
-_INLINE_ void list_del(struct list_head *entry)
-{
- __list_del(entry->prev, entry->next);
-}
-
-/**
- * list_del_init - deletes entry from list and reinitialize it.
- * @entry: the element to delete from the list.
- */
-_INLINE_ void list_del_init(struct list_head *entry)
-{
- __list_del(entry->prev, entry->next);
- INIT_LIST_HEAD(entry);
-}
-
-/**
- * list_empty - tests whether a list is empty
- * @head: the list to test.
- */
-_INLINE_ int list_empty(struct list_head *head)
-{
- return head->next == head;
-}
-
-/**
- * list_entry_is_last - tests whether is entry last in the list
- * @entry: the entry to test.
- * @head: the list to test.
- */
-_INLINE_ int list_entry_is_last(struct list_head *entry, struct list_head *head)
-{
- return head->prev == entry;
-}
-
-/**
- * list_splice - join two lists
- * @list: the new list to add.
- * @head: the place to add it in the first list.
- */
-_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;
- }
-}
-
-/**
- * list_entry - get the struct for this entry
- * @ptr: the &struct list_head pointer.
- * @type: the type of the struct this is embedded in.
- * @member: the name of the list_struct within the struct.
- */
-#define list_entry(ptr, type, member) ({ \
- const typeof( ((type *)0)->member ) *__mptr = (ptr); \
- (type *)( (char *)__mptr - offsetof(type,member) );})
-
-
-#define list_first_entry(head, type, member) \
- ((head) && (head)->next != (head) ? list_entry((head)->next, type, member) : NULL)
-
-#define list_last_entry(head, type, member) \
- ((head) && (head)->prev != (head) ? list_entry((head)->prev, type, member) : NULL)
-
-/**
- * list_for_each - iterate over elements in a list
- * @pos: the &struct list_head to use as a loop counter.
- * @head: the head for your list.
- */
-#define list_for_each(pos, head) \
- for (pos = (head)->next; pos != (head); pos = pos->next)
-
-/**
- * list_for_each_backwardly - iterate over elements in a list in reverse
- * @pos: the &struct list_head to use as a loop counter.
- * @head: the head for your list.
- */
-#define list_for_each_backwardly(pos, head) \
- for (pos = (head)->prev; pos != (head); pos = pos->prev)
-
-/**
- * list_for_each_safe - iterate over elements in a list, but don't dereference
- * pos after the body is done (in case it is freed)
- * @pos: the &struct list_head to use as a loop counter.
- * @pnext: the &struct list_head to use as a pointer to the next item.
- * @head: the head for your list (not included in iteration).
- */
-#define list_for_each_safe(pos, pnext, head) \
- for (pos = (head)->next, pnext = pos->next; pos != (head); \
- pos = pnext, pnext = pos->next)
-
-#define MAX_LIST_LENGTH_BITS 20
-
-/*
- * Returns a list organized in an intermediate format suited
- * to chaining of merge() calls: null-terminated, no reserved or
- * sentinel head node, "prev" links not maintained.
- */
-_INLINE_ struct list_head *merge(int (*cmp)(struct list_head *a,
- struct list_head *b),
- struct list_head *a, struct list_head *b)
-{
- struct list_head head, *tail = &head;
-
- while (a && b) {
- /* if equal, take 'a' -- important for sort stability */
- if ((*cmp)(a, b) <= 0) {
- tail->next = a;
- a = a->next;
- } else {
- tail->next = b;
- b = b->next;
- }
- tail = tail->next;
- }
- tail->next = a ? a : b;
- return head.next;
-}
-
-/*
- * Combine final list merge with restoration of standard doubly-linked
- * list structure. This approach duplicates code from merge(), but
- * runs faster than the tidier alternatives of either a separate final
- * prev-link restoration pass, or maintaining the prev links
- * throughout.
- */
-_INLINE_ void merge_and_restore_back_links(int (*cmp)(struct list_head *a,
- struct list_head *b),
- struct list_head *head,
- struct list_head *a, struct list_head *b)
-{
- struct list_head *tail = head;
-
- while (a && b) {
- /* if equal, take 'a' -- important for sort stability */
- if ((*cmp)(a, b) <= 0) {
- tail->next = a;
- a->prev = tail;
- a = a->next;
- } else {
- tail->next = b;
- b->prev = tail;
- b = b->next;
- }
- tail = tail->next;
- }
- tail->next = a ? a : b;
-
- do {
- /*
- * In worst cases this loop may run many iterations.
- * Continue callbacks to the client even though no
- * element comparison is needed, so the client's cmp()
- * routine can invoke cond_resched() periodically.
- */
- (*cmp)(tail->next, tail->next);
-
- tail->next->prev = tail;
- tail = tail->next;
- } while (tail->next);
-
- tail->next = head;
- head->prev = tail;
-}
-
-
-/**
- * list_sort - sort a list
- * @head: the list to sort
- * @cmp: the elements comparison function
- *
- * This function implements "merge sort", which has O(nlog(n))
- * complexity.
- *
- * The comparison function @cmp must return a negative value if @a
- * should sort before @b, and a positive value if @a should sort after
- * @b. If @a and @b are equivalent, and their original relative
- * ordering is to be preserved, @cmp must return 0.
- */
-_INLINE_ void list_sort(struct list_head *head,
- int (*cmp)(struct list_head *a,
- struct list_head *b))
-{
- struct list_head *part[MAX_LIST_LENGTH_BITS+1]; /* sorted partial lists
- -- last slot is a sentinel */
- size_t lev; /* index into part[] */
- size_t max_lev = 0;
- struct list_head *list;
-
- if (list_empty(head))
- return;
-
- memset(part, 0, sizeof(part));
-
- head->prev->next = NULL;
- list = head->next;
-
- while (list) {
- struct list_head *cur = list;
- list = list->next;
- cur->next = NULL;
-
- for (lev = 0; part[lev]; lev++) {
- cur = merge(cmp, part[lev], cur);
- part[lev] = NULL;
- }
- if (lev > max_lev) {
- /* list passed to list_sort() too long for efficiency */
- if (lev >= ARRAY_SIZE(part) - 1)
- lev--;
- max_lev = lev;
- }
- part[lev] = cur;
- }
-
- for (lev = 0; lev < max_lev; lev++)
- if (part[lev])
- list = merge(cmp, part[lev], list);
-
- merge_and_restore_back_links(cmp, head, part[max_lev], list);
-}
-
-#undef _INLINE_
-
-#endif /* UTIL_LINUX_LIST_H */