utils.h

   1 #ifndef __NETIFD_UTILS_H
   2 #define __NETIFD_UTILS_H
   3
   4 #include <libubox/list.h>
   5 #include <libubox/avl.h>
   6
   7 #define __init __attribute__((constructor))
   8
   9 struct vlist_tree;
  10 struct vlist_node;
  11
  12 typedef void (*vlist_update_cb)(struct vlist_tree *tree,
  13                                 struct vlist_node *node_new,
  14                                 struct vlist_node *node_old);
  15
  16 struct vlist_tree {
  17         struct avl_tree avl;
  18
  19         vlist_update_cb update;
  20         int key_offset;
  21         bool keep_old;
  22         bool no_delete;
  23
  24         int version;
  25 };
  26
  27 struct vlist_node {
  28         struct avl_node avl;
  29         int version;
  30 };
  31
  32 void __vlist_init(struct vlist_tree *tree, avl_tree_comp cmp, vlist_update_cb update, int offset);
  33
  34 #define vlist_init(tree, cmp, update, type, node, key) \
  35         __vlist_init(tree, cmp, update, offsetof(type, key) - offsetof(type, node))
  36
  37 static inline void vlist_update(struct vlist_tree *tree)
  38 {
  39         tree->version++;
  40 }
  41
  42 void vlist_add(struct vlist_tree *tree, struct vlist_node *node);
  43 void vlist_delete(struct vlist_tree *tree, struct vlist_node *node);
  44 void vlist_flush(struct vlist_tree *tree);
  45 void vlist_flush_all(struct vlist_tree *tree);
  46
  47 #define vlist_for_each_element(tree, element, node_member) \
  48         avl_for_each_element(&(tree)->avl, element, node_member.avl)
  49
  50 #ifdef __linux__
  51 static inline int fls(int x)
  52 {
  53     int r = 32;
  54
  55     if (!x)
  56         return 0;
  57     if (!(x & 0xffff0000u)) {
  58         x <<= 16;
  59         r -= 16;
  60     }
  61     if (!(x & 0xff000000u)) {
  62         x <<= 8;
  63         r -= 8;
  64     }
  65     if (!(x & 0xf0000000u)) {
  66         x <<= 4;
  67         r -= 4;
  68     }
  69     if (!(x & 0xc0000000u)) {
  70         x <<= 2;
  71         r -= 2;
  72     }
  73     if (!(x & 0x80000000u)) {
  74         x <<= 1;
  75         r -= 1;
  76     }
  77     return r;
  78 }
  79 #endif
  80
  81 int avl_strcmp(const void *k1, const void *k2, void *ptr);
  82
  83 #endif