142 lines
2.6 KiB
C
142 lines
2.6 KiB
C
/*
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* Based on strlist.c by:
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* (c) 2009 Arnaldo Carvalho de Melo <acme@redhat.com>
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*
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* Licensed under the GPLv2.
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*/
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "rblist.h"
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int rblist__add_node(struct rblist *rblist, const void *new_entry)
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{
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struct rb_node **p = &rblist->entries.rb_root.rb_node;
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struct rb_node *parent = NULL, *new_node;
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bool leftmost = true;
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while (*p != NULL) {
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int rc;
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parent = *p;
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rc = rblist->node_cmp(parent, new_entry);
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if (rc > 0)
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p = &(*p)->rb_left;
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else if (rc < 0) {
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p = &(*p)->rb_right;
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leftmost = false;
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}
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else
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return -EEXIST;
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}
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new_node = rblist->node_new(rblist, new_entry);
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if (new_node == NULL)
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return -ENOMEM;
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rb_link_node(new_node, parent, p);
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rb_insert_color_cached(new_node, &rblist->entries, leftmost);
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++rblist->nr_entries;
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return 0;
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}
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void rblist__remove_node(struct rblist *rblist, struct rb_node *rb_node)
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{
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rb_erase_cached(rb_node, &rblist->entries);
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--rblist->nr_entries;
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rblist->node_delete(rblist, rb_node);
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}
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static struct rb_node *__rblist__findnew(struct rblist *rblist,
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const void *entry,
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bool create)
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{
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struct rb_node **p = &rblist->entries.rb_root.rb_node;
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struct rb_node *parent = NULL, *new_node = NULL;
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bool leftmost = true;
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while (*p != NULL) {
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int rc;
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parent = *p;
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rc = rblist->node_cmp(parent, entry);
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if (rc > 0)
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p = &(*p)->rb_left;
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else if (rc < 0) {
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p = &(*p)->rb_right;
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leftmost = false;
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}
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else
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return parent;
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}
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if (create) {
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new_node = rblist->node_new(rblist, entry);
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if (new_node) {
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rb_link_node(new_node, parent, p);
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rb_insert_color_cached(new_node,
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&rblist->entries, leftmost);
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++rblist->nr_entries;
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}
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}
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return new_node;
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}
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struct rb_node *rblist__find(struct rblist *rblist, const void *entry)
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{
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return __rblist__findnew(rblist, entry, false);
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}
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struct rb_node *rblist__findnew(struct rblist *rblist, const void *entry)
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{
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return __rblist__findnew(rblist, entry, true);
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}
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void rblist__init(struct rblist *rblist)
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{
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if (rblist != NULL) {
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rblist->entries = RB_ROOT_CACHED;
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rblist->nr_entries = 0;
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}
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return;
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}
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void rblist__exit(struct rblist *rblist)
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{
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struct rb_node *pos, *next = rb_first_cached(&rblist->entries);
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while (next) {
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pos = next;
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next = rb_next(pos);
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rblist__remove_node(rblist, pos);
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}
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}
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void rblist__delete(struct rblist *rblist)
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{
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if (rblist != NULL) {
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rblist__exit(rblist);
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free(rblist);
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}
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}
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struct rb_node *rblist__entry(const struct rblist *rblist, unsigned int idx)
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{
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struct rb_node *node;
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for (node = rb_first_cached(&rblist->entries); node;
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node = rb_next(node)) {
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if (!idx--)
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return node;
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}
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return NULL;
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}
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