141 lines
2.6 KiB
C
141 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Based on strlist.c by:
|
|
* (c) 2009 Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "rblist.h"
|
|
|
|
int rblist__add_node(struct rblist *rblist, const void *new_entry)
|
|
{
|
|
struct rb_node **p = &rblist->entries.rb_root.rb_node;
|
|
struct rb_node *parent = NULL, *new_node;
|
|
bool leftmost = true;
|
|
|
|
while (*p != NULL) {
|
|
int rc;
|
|
|
|
parent = *p;
|
|
|
|
rc = rblist->node_cmp(parent, new_entry);
|
|
if (rc > 0)
|
|
p = &(*p)->rb_left;
|
|
else if (rc < 0) {
|
|
p = &(*p)->rb_right;
|
|
leftmost = false;
|
|
}
|
|
else
|
|
return -EEXIST;
|
|
}
|
|
|
|
new_node = rblist->node_new(rblist, new_entry);
|
|
if (new_node == NULL)
|
|
return -ENOMEM;
|
|
|
|
rb_link_node(new_node, parent, p);
|
|
rb_insert_color_cached(new_node, &rblist->entries, leftmost);
|
|
++rblist->nr_entries;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void rblist__remove_node(struct rblist *rblist, struct rb_node *rb_node)
|
|
{
|
|
rb_erase_cached(rb_node, &rblist->entries);
|
|
--rblist->nr_entries;
|
|
rblist->node_delete(rblist, rb_node);
|
|
}
|
|
|
|
static struct rb_node *__rblist__findnew(struct rblist *rblist,
|
|
const void *entry,
|
|
bool create)
|
|
{
|
|
struct rb_node **p = &rblist->entries.rb_root.rb_node;
|
|
struct rb_node *parent = NULL, *new_node = NULL;
|
|
bool leftmost = true;
|
|
|
|
while (*p != NULL) {
|
|
int rc;
|
|
|
|
parent = *p;
|
|
|
|
rc = rblist->node_cmp(parent, entry);
|
|
if (rc > 0)
|
|
p = &(*p)->rb_left;
|
|
else if (rc < 0) {
|
|
p = &(*p)->rb_right;
|
|
leftmost = false;
|
|
}
|
|
else
|
|
return parent;
|
|
}
|
|
|
|
if (create) {
|
|
new_node = rblist->node_new(rblist, entry);
|
|
if (new_node) {
|
|
rb_link_node(new_node, parent, p);
|
|
rb_insert_color_cached(new_node,
|
|
&rblist->entries, leftmost);
|
|
++rblist->nr_entries;
|
|
}
|
|
}
|
|
|
|
return new_node;
|
|
}
|
|
|
|
struct rb_node *rblist__find(struct rblist *rblist, const void *entry)
|
|
{
|
|
return __rblist__findnew(rblist, entry, false);
|
|
}
|
|
|
|
struct rb_node *rblist__findnew(struct rblist *rblist, const void *entry)
|
|
{
|
|
return __rblist__findnew(rblist, entry, true);
|
|
}
|
|
|
|
void rblist__init(struct rblist *rblist)
|
|
{
|
|
if (rblist != NULL) {
|
|
rblist->entries = RB_ROOT_CACHED;
|
|
rblist->nr_entries = 0;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
void rblist__exit(struct rblist *rblist)
|
|
{
|
|
struct rb_node *pos, *next = rb_first_cached(&rblist->entries);
|
|
|
|
while (next) {
|
|
pos = next;
|
|
next = rb_next(pos);
|
|
rblist__remove_node(rblist, pos);
|
|
}
|
|
}
|
|
|
|
void rblist__delete(struct rblist *rblist)
|
|
{
|
|
if (rblist != NULL) {
|
|
rblist__exit(rblist);
|
|
free(rblist);
|
|
}
|
|
}
|
|
|
|
struct rb_node *rblist__entry(const struct rblist *rblist, unsigned int idx)
|
|
{
|
|
struct rb_node *node;
|
|
|
|
for (node = rb_first_cached(&rblist->entries); node;
|
|
node = rb_next(node)) {
|
|
if (!idx--)
|
|
return node;
|
|
}
|
|
|
|
return NULL;
|
|
}
|