15efdfe75SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
237bbd3ffSDavid Ahern /*
337bbd3ffSDavid Ahern * Based on strlist.c by:
437bbd3ffSDavid Ahern * (c) 2009 Arnaldo Carvalho de Melo <acme@redhat.com>
537bbd3ffSDavid Ahern */
637bbd3ffSDavid Ahern
737bbd3ffSDavid Ahern #include <errno.h>
837bbd3ffSDavid Ahern #include <stdio.h>
937bbd3ffSDavid Ahern #include <stdlib.h>
1037bbd3ffSDavid Ahern
1137bbd3ffSDavid Ahern #include "rblist.h"
1237bbd3ffSDavid Ahern
rblist__add_node(struct rblist * rblist,const void * new_entry)1337bbd3ffSDavid Ahern int rblist__add_node(struct rblist *rblist, const void *new_entry)
1437bbd3ffSDavid Ahern {
15ca227029SDavidlohr Bueso struct rb_node **p = &rblist->entries.rb_root.rb_node;
1637bbd3ffSDavid Ahern struct rb_node *parent = NULL, *new_node;
17ca227029SDavidlohr Bueso bool leftmost = true;
1837bbd3ffSDavid Ahern
1937bbd3ffSDavid Ahern while (*p != NULL) {
2037bbd3ffSDavid Ahern int rc;
2137bbd3ffSDavid Ahern
2237bbd3ffSDavid Ahern parent = *p;
2337bbd3ffSDavid Ahern
2437bbd3ffSDavid Ahern rc = rblist->node_cmp(parent, new_entry);
2537bbd3ffSDavid Ahern if (rc > 0)
2637bbd3ffSDavid Ahern p = &(*p)->rb_left;
27ca227029SDavidlohr Bueso else if (rc < 0) {
2837bbd3ffSDavid Ahern p = &(*p)->rb_right;
29ca227029SDavidlohr Bueso leftmost = false;
30ca227029SDavidlohr Bueso }
3137bbd3ffSDavid Ahern else
3237bbd3ffSDavid Ahern return -EEXIST;
3337bbd3ffSDavid Ahern }
3437bbd3ffSDavid Ahern
3537bbd3ffSDavid Ahern new_node = rblist->node_new(rblist, new_entry);
3637bbd3ffSDavid Ahern if (new_node == NULL)
3737bbd3ffSDavid Ahern return -ENOMEM;
3837bbd3ffSDavid Ahern
3937bbd3ffSDavid Ahern rb_link_node(new_node, parent, p);
40ca227029SDavidlohr Bueso rb_insert_color_cached(new_node, &rblist->entries, leftmost);
4137bbd3ffSDavid Ahern ++rblist->nr_entries;
4237bbd3ffSDavid Ahern
4337bbd3ffSDavid Ahern return 0;
4437bbd3ffSDavid Ahern }
4537bbd3ffSDavid Ahern
rblist__remove_node(struct rblist * rblist,struct rb_node * rb_node)4637bbd3ffSDavid Ahern void rblist__remove_node(struct rblist *rblist, struct rb_node *rb_node)
4737bbd3ffSDavid Ahern {
48ca227029SDavidlohr Bueso rb_erase_cached(rb_node, &rblist->entries);
4903f2f93aSSuzuki K. Poulose --rblist->nr_entries;
5037bbd3ffSDavid Ahern rblist->node_delete(rblist, rb_node);
5137bbd3ffSDavid Ahern }
5237bbd3ffSDavid Ahern
__rblist__findnew(struct rblist * rblist,const void * entry,bool create)53813335b8SDavid Ahern static struct rb_node *__rblist__findnew(struct rblist *rblist,
54813335b8SDavid Ahern const void *entry,
55813335b8SDavid Ahern bool create)
5637bbd3ffSDavid Ahern {
57ca227029SDavidlohr Bueso struct rb_node **p = &rblist->entries.rb_root.rb_node;
58813335b8SDavid Ahern struct rb_node *parent = NULL, *new_node = NULL;
59ca227029SDavidlohr Bueso bool leftmost = true;
6037bbd3ffSDavid Ahern
6137bbd3ffSDavid Ahern while (*p != NULL) {
6237bbd3ffSDavid Ahern int rc;
6337bbd3ffSDavid Ahern
6437bbd3ffSDavid Ahern parent = *p;
6537bbd3ffSDavid Ahern
6637bbd3ffSDavid Ahern rc = rblist->node_cmp(parent, entry);
6737bbd3ffSDavid Ahern if (rc > 0)
6837bbd3ffSDavid Ahern p = &(*p)->rb_left;
69ca227029SDavidlohr Bueso else if (rc < 0) {
7037bbd3ffSDavid Ahern p = &(*p)->rb_right;
71ca227029SDavidlohr Bueso leftmost = false;
72ca227029SDavidlohr Bueso }
7337bbd3ffSDavid Ahern else
7437bbd3ffSDavid Ahern return parent;
7537bbd3ffSDavid Ahern }
7637bbd3ffSDavid Ahern
77813335b8SDavid Ahern if (create) {
78813335b8SDavid Ahern new_node = rblist->node_new(rblist, entry);
79813335b8SDavid Ahern if (new_node) {
80813335b8SDavid Ahern rb_link_node(new_node, parent, p);
81ca227029SDavidlohr Bueso rb_insert_color_cached(new_node,
82ca227029SDavidlohr Bueso &rblist->entries, leftmost);
83813335b8SDavid Ahern ++rblist->nr_entries;
84813335b8SDavid Ahern }
85813335b8SDavid Ahern }
86813335b8SDavid Ahern
87813335b8SDavid Ahern return new_node;
88813335b8SDavid Ahern }
89813335b8SDavid Ahern
rblist__find(struct rblist * rblist,const void * entry)90813335b8SDavid Ahern struct rb_node *rblist__find(struct rblist *rblist, const void *entry)
91813335b8SDavid Ahern {
92813335b8SDavid Ahern return __rblist__findnew(rblist, entry, false);
93813335b8SDavid Ahern }
94813335b8SDavid Ahern
rblist__findnew(struct rblist * rblist,const void * entry)95813335b8SDavid Ahern struct rb_node *rblist__findnew(struct rblist *rblist, const void *entry)
96813335b8SDavid Ahern {
97813335b8SDavid Ahern return __rblist__findnew(rblist, entry, true);
9837bbd3ffSDavid Ahern }
9937bbd3ffSDavid Ahern
rblist__init(struct rblist * rblist)10037bbd3ffSDavid Ahern void rblist__init(struct rblist *rblist)
10137bbd3ffSDavid Ahern {
10237bbd3ffSDavid Ahern if (rblist != NULL) {
103ca227029SDavidlohr Bueso rblist->entries = RB_ROOT_CACHED;
10437bbd3ffSDavid Ahern rblist->nr_entries = 0;
10537bbd3ffSDavid Ahern }
10637bbd3ffSDavid Ahern
10737bbd3ffSDavid Ahern return;
10837bbd3ffSDavid Ahern }
10937bbd3ffSDavid Ahern
rblist__exit(struct rblist * rblist)11033fec3e3SJin Yao void rblist__exit(struct rblist *rblist)
11137bbd3ffSDavid Ahern {
112ca227029SDavidlohr Bueso struct rb_node *pos, *next = rb_first_cached(&rblist->entries);
11337bbd3ffSDavid Ahern
11437bbd3ffSDavid Ahern while (next) {
11537bbd3ffSDavid Ahern pos = next;
11637bbd3ffSDavid Ahern next = rb_next(pos);
11703f2f93aSSuzuki K. Poulose rblist__remove_node(rblist, pos);
11837bbd3ffSDavid Ahern }
11933fec3e3SJin Yao }
12033fec3e3SJin Yao
rblist__delete(struct rblist * rblist)12133fec3e3SJin Yao void rblist__delete(struct rblist *rblist)
12233fec3e3SJin Yao {
12333fec3e3SJin Yao if (rblist != NULL) {
12433fec3e3SJin Yao rblist__exit(rblist);
12537bbd3ffSDavid Ahern free(rblist);
12637bbd3ffSDavid Ahern }
12737bbd3ffSDavid Ahern }
12837bbd3ffSDavid Ahern
rblist__entry(const struct rblist * rblist,unsigned int idx)12937bbd3ffSDavid Ahern struct rb_node *rblist__entry(const struct rblist *rblist, unsigned int idx)
13037bbd3ffSDavid Ahern {
13137bbd3ffSDavid Ahern struct rb_node *node;
13237bbd3ffSDavid Ahern
133ca227029SDavidlohr Bueso for (node = rb_first_cached(&rblist->entries); node;
134ca227029SDavidlohr Bueso node = rb_next(node)) {
13537bbd3ffSDavid Ahern if (!idx--)
13637bbd3ffSDavid Ahern return node;
13737bbd3ffSDavid Ahern }
13837bbd3ffSDavid Ahern
13937bbd3ffSDavid Ahern return NULL;
14037bbd3ffSDavid Ahern }
141