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 #ifdef DEBUG
   8 #define DPRINTF(format, ...) fprintf(stderr, "%s(%d): " format, __func__, __LINE__, ## __VA_ARGS__)
   9 #else
  10 #define DPRINTF(format, ...) no_debug(format, ## __VA_ARGS__)
  11 #endif
  12
  13 static inline void no_debug(const char *fmt, ...)
  14 {
  15 }
  16
  17 #define __init __attribute__((constructor))
  18
  19 struct vlist_tree;
  20 struct vlist_node;
  21
  22 typedef void (*vlist_update_cb)(struct vlist_tree *tree,
  23                                 struct vlist_node *node_new,
  24                                 struct vlist_node *node_old);
  25
  26 struct vlist_tree {
  27         struct avl_tree avl;
  28
  29         vlist_update_cb update;
  30
  31         int data_offset;
  32         int data_len;
  33
  34         int version;
  35 };
  36
  37 struct vlist_node {
  38         struct avl_node avl;
  39         int version;
  40 };
  41
  42 void __vlist_init(struct vlist_tree *tree, vlist_update_cb update, int offset, int len);
  43
  44 #define vlist_init(tree, update, type, vlist, first, last) \
  45         __vlist_init(tree, update, offsetof(type, first) - offsetof(type, vlist), \
  46                      offsetof(type, last) - offsetof(type, first) + sizeof(((type *) 0)->last))
  47
  48 void vlist_add(struct vlist_tree *tree, struct vlist_node *node);
  49 void vlist_delete(struct vlist_tree *tree, struct vlist_node *node);
  50 void vlist_flush(struct vlist_tree *tree);
  51 void vlist_flush_all(struct vlist_tree *tree);
  52
  53 #ifdef __linux__
  54 static inline int fls(int x)
  55 {
  56     int r = 32;
  57
  58     if (!x)
  59         return 0;
  60     if (!(x & 0xffff0000u)) {
  61         x <<= 16;
  62         r -= 16;
  63     }
  64     if (!(x & 0xff000000u)) {
  65         x <<= 8;
  66         r -= 8;
  67     }
  68     if (!(x & 0xf0000000u)) {
  69         x <<= 4;
  70         r -= 4;
  71     }
  72     if (!(x & 0xc0000000u)) {
  73         x <<= 2;
  74         r -= 2;
  75     }
  76     if (!(x & 0x80000000u)) {
  77         x <<= 1;
  78         r -= 1;
  79     }
  80     return r;
  81 }
  82 #endif
  83
  84 int avl_strcmp(const void *k1, const void *k2, void *ptr);
  85
  86 #endif