utils.c

   1 /*
   2  * netifd - network interface daemon
   3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14 #include <string.h>
  15 #include <stdlib.h>
  16 #include "utils.h"
  17
  18 void
  19 __vlist_simple_init(struct vlist_simple_tree *tree, int offset)
  20 {
  21         INIT_LIST_HEAD(&tree->list);
  22         tree->version = 1;
  23         tree->head_offset = offset;
  24 }
  25
  26 void
  27 vlist_simple_delete(struct vlist_simple_tree *tree, struct vlist_simple_node *node)
  28 {
  29         char *ptr;
  30
  31         list_del(&node->list);
  32         ptr = (char *) node - tree->head_offset;
  33         free(ptr);
  34 }
  35
  36 void
  37 vlist_simple_flush(struct vlist_simple_tree *tree)
  38 {
  39         struct vlist_simple_node *n, *tmp;
  40
  41         list_for_each_entry_safe(n, tmp, &tree->list, list) {
  42                 if ((n->version == tree->version || n->version == -1) &&
  43                     tree->version != -1)
  44                         continue;
  45
  46                 vlist_simple_delete(tree, n);
  47         }
  48 }
  49
  50 void
  51 vlist_simple_replace(struct vlist_simple_tree *dest, struct vlist_simple_tree *old)
  52 {
  53         struct vlist_simple_node *n, *tmp;
  54
  55         vlist_simple_update(dest);
  56         list_for_each_entry_safe(n, tmp, &old->list, list) {
  57                 list_del(&n->list);
  58                 vlist_simple_add(dest, n);
  59         }
  60         vlist_simple_flush(dest);
  61 }
  62
  63 void
  64 vlist_simple_flush_all(struct vlist_simple_tree *tree)
  65 {
  66         tree->version = -1;
  67         vlist_simple_flush(tree);
  68 }