blob: 0dfe27d99458c845991e490283c067d0d0706221 [file] [log] [blame]
David Ahern37bbd3f2012-07-30 22:31:32 -06001/*
2 * Based on strlist.c by:
3 * (c) 2009 Arnaldo Carvalho de Melo <acme@redhat.com>
4 *
5 * Licensed under the GPLv2.
6 */
7
8#include <errno.h>
9#include <stdio.h>
10#include <stdlib.h>
11
12#include "rblist.h"
13
14int rblist__add_node(struct rblist *rblist, const void *new_entry)
15{
16 struct rb_node **p = &rblist->entries.rb_node;
17 struct rb_node *parent = NULL, *new_node;
18
19 while (*p != NULL) {
20 int rc;
21
22 parent = *p;
23
24 rc = rblist->node_cmp(parent, new_entry);
25 if (rc > 0)
26 p = &(*p)->rb_left;
27 else if (rc < 0)
28 p = &(*p)->rb_right;
29 else
30 return -EEXIST;
31 }
32
33 new_node = rblist->node_new(rblist, new_entry);
34 if (new_node == NULL)
35 return -ENOMEM;
36
37 rb_link_node(new_node, parent, p);
38 rb_insert_color(new_node, &rblist->entries);
39 ++rblist->nr_entries;
40
41 return 0;
42}
43
44void rblist__remove_node(struct rblist *rblist, struct rb_node *rb_node)
45{
46 rb_erase(rb_node, &rblist->entries);
Suzuki K. Poulose03f2f932012-08-31 12:39:18 +053047 --rblist->nr_entries;
David Ahern37bbd3f2012-07-30 22:31:32 -060048 rblist->node_delete(rblist, rb_node);
49}
50
David Ahern813335b2013-10-08 21:26:52 -060051static struct rb_node *__rblist__findnew(struct rblist *rblist,
52 const void *entry,
53 bool create)
David Ahern37bbd3f2012-07-30 22:31:32 -060054{
55 struct rb_node **p = &rblist->entries.rb_node;
David Ahern813335b2013-10-08 21:26:52 -060056 struct rb_node *parent = NULL, *new_node = NULL;
David Ahern37bbd3f2012-07-30 22:31:32 -060057
58 while (*p != NULL) {
59 int rc;
60
61 parent = *p;
62
63 rc = rblist->node_cmp(parent, entry);
64 if (rc > 0)
65 p = &(*p)->rb_left;
66 else if (rc < 0)
67 p = &(*p)->rb_right;
68 else
69 return parent;
70 }
71
David Ahern813335b2013-10-08 21:26:52 -060072 if (create) {
73 new_node = rblist->node_new(rblist, entry);
74 if (new_node) {
75 rb_link_node(new_node, parent, p);
76 rb_insert_color(new_node, &rblist->entries);
77 ++rblist->nr_entries;
78 }
79 }
80
81 return new_node;
82}
83
84struct rb_node *rblist__find(struct rblist *rblist, const void *entry)
85{
86 return __rblist__findnew(rblist, entry, false);
87}
88
89struct rb_node *rblist__findnew(struct rblist *rblist, const void *entry)
90{
91 return __rblist__findnew(rblist, entry, true);
David Ahern37bbd3f2012-07-30 22:31:32 -060092}
93
94void rblist__init(struct rblist *rblist)
95{
96 if (rblist != NULL) {
97 rblist->entries = RB_ROOT;
98 rblist->nr_entries = 0;
99 }
100
101 return;
102}
103
104void rblist__delete(struct rblist *rblist)
105{
106 if (rblist != NULL) {
107 struct rb_node *pos, *next = rb_first(&rblist->entries);
108
109 while (next) {
110 pos = next;
111 next = rb_next(pos);
Suzuki K. Poulose03f2f932012-08-31 12:39:18 +0530112 rblist__remove_node(rblist, pos);
David Ahern37bbd3f2012-07-30 22:31:32 -0600113 }
114 free(rblist);
115 }
116}
117
118struct rb_node *rblist__entry(const struct rblist *rblist, unsigned int idx)
119{
120 struct rb_node *node;
121
122 for (node = rb_first(&rblist->entries); node; node = rb_next(node)) {
123 if (!idx--)
124 return node;
125 }
126
127 return NULL;
128}