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