forked from Minki/linux
37bbd3fff1
rblist is the rbtree based code from strlist. It will be the common code for strlist and the to-be-introduced intlist. Signed-off-by: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1343709095-7089-2-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
108 lines
1.9 KiB
C
108 lines
1.9 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_node;
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struct rb_node *parent = NULL, *new_node;
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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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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(new_node, &rblist->entries);
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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(rb_node, &rblist->entries);
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rblist->node_delete(rblist, rb_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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struct rb_node **p = &rblist->entries.rb_node;
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struct rb_node *parent = NULL;
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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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else
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return parent;
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}
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return NULL;
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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;
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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__delete(struct rblist *rblist)
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{
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if (rblist != NULL) {
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struct rb_node *pos, *next = rb_first(&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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rb_erase(pos, &rblist->entries);
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rblist->node_delete(rblist, pos);
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}
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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(&rblist->entries); node; 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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