53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
/*
|
|
* This file is copyright 2001 Simon Tatham.
|
|
* Rewritten from original source 2006 by Dan Merillat for use in u-boot.
|
|
*
|
|
* Original code can be found at:
|
|
* http://www.chiark.greenend.org.uk/~sgtatham/algorithms/listsort.html
|
|
*
|
|
* SPDX-License-Identifier: MIT
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include "jffs2_private.h"
|
|
|
|
int sort_list(struct b_list *list)
|
|
{
|
|
struct b_node *p, *q, *e, **tail;
|
|
int k, psize, qsize;
|
|
|
|
if (!list->listHead)
|
|
return 0;
|
|
|
|
for (k = 1; k < list->listCount; k *= 2) {
|
|
tail = &list->listHead;
|
|
for (p = q = list->listHead; p; p = q) {
|
|
/* step 'k' places from p; */
|
|
for (psize = 0; q && psize < k; psize++)
|
|
q = q->next;
|
|
qsize = k;
|
|
|
|
/* two lists, merge them. */
|
|
while (psize || (qsize && q)) {
|
|
/* merge the next element */
|
|
if (psize == 0 ||
|
|
((qsize && q) &&
|
|
list->listCompare(p, q))) {
|
|
/* p is empty, or p > q, so q next */
|
|
e = q;
|
|
q = q->next;
|
|
qsize--;
|
|
} else {
|
|
e = p;
|
|
p = p->next;
|
|
psize--;
|
|
}
|
|
e->next = NULL; /* break accidental loops. */
|
|
*tail = e;
|
|
tail = &e->next;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|