tools/perf/util/rblist.c

   1 /*
   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
  14 int 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
  44 void rblist__remove_node(struct rblist *rblist, struct rb_node *rb_node)
  45 {
  46         rb_erase(rb_node, &rblist->entries);
  47         --rblist->nr_entries;
  48         rblist->node_delete(rblist, rb_node);
  49 }
  50
  51 struct rb_node *rblist__find(struct rblist *rblist, const void *entry)
  52 {
  53         struct rb_node **p = &rblist->entries.rb_node;
  54         struct rb_node *parent = NULL;
  55
  56         while (*p != NULL) {
  57                 int rc;
  58
  59                 parent = *p;
  60
  61                 rc = rblist->node_cmp(parent, entry);
  62                 if (rc > 0)
  63                         p = &(*p)->rb_left;
  64                 else if (rc < 0)
  65                         p = &(*p)->rb_right;
  66                 else
  67                         return parent;
  68         }
  69
  70         return NULL;
  71 }
  72
  73 void rblist__init(struct rblist *rblist)
  74 {
  75         if (rblist != NULL) {
  76                 rblist->entries  = RB_ROOT;
  77                 rblist->nr_entries = 0;
  78         }
  79
  80         return;
  81 }
  82
  83 void rblist__delete(struct rblist *rblist)
  84 {
  85         if (rblist != NULL) {
  86                 struct rb_node *pos, *next = rb_first(&rblist->entries);
  87
  88                 while (next) {
  89                         pos = next;
  90                         next = rb_next(pos);
  91                         rblist__remove_node(rblist, pos);
  92                 }
  93                 free(rblist);
  94         }
  95 }
  96
  97 struct rb_node *rblist__entry(const struct rblist *rblist, unsigned int idx)
  98 {
  99         struct rb_node *node;
 100
 101         for (node = rb_first(&rblist->entries); node; node = rb_next(node)) {
 102                 if (!idx--)
 103                         return node;
 104         }
 105
 106         return NULL;
 107 }