1 /* ISC license. */
2 
3 #ifndef AVLNODE_H
4 #define AVLNODE_H
5 
6 #include <stdint.h>
7 #include <skalibs/gccattributes.h>
8 #include <skalibs/functypes.h>
9 
10 
11 #define AVLNODE_MAXDEPTH 49  /* enough for 2^32 nodes in the worst case */
12 
13 typedef int avliterfunc_t (uint32_t, unsigned int, void *) ;
14 typedef avliterfunc_t *avliterfunc_t_ref ;
15 
16 typedef struct avlnode_s avlnode, *avlnode_ref ;
17 struct avlnode_s
18 {
19   uint32_t data ;
20   uint32_t child[2] ;
21   signed char balance : 2 ;
22 } ;
23 
24 #define AVLNODE_ZERO { .data = 0, .child = { UINT32_MAX, UINT32_MAX }, .balance = 0 }
25 extern avlnode const avlnode_zero ;
26 
27 extern uint32_t avlnode_searchnode (avlnode const *, uint32_t, uint32_t, void const *, dtokfunc_t_ref, cmpfunc_t_ref, void *) ;
28 extern int avlnode_search (avlnode const *, uint32_t, uint32_t, void const *, uint32_t *, dtokfunc_t_ref, cmpfunc_t_ref, void *) ;
29 extern unsigned int avlnode_height (avlnode const *, uint32_t, uint32_t) gccattr_pure ;
30 
31 extern uint32_t avlnode_extremenode (avlnode const *, uint32_t, uint32_t, int) gccattr_pure ;
32 #define avlnode_minnode(s, max, r) avlnode_extremenode(s, max, (r), 0)
33 #define avlnode_maxnode(s, max, r) avlnode_extremenode(s, max, (r), 1)
34 
35 extern int avlnode_extreme (avlnode const *, uint32_t, uint32_t, int, uint32_t *) ;
36 #define avlnode_min(s, max, r, data) avlnode_extreme(s, max, (r), 0, data)
37 #define avlnode_max(s, max, r, data) avlnode_extreme(s, max, (r), 1, data)
38 
39 extern uint32_t avlnode_insertnode (avlnode *, uint32_t, uint32_t, uint32_t, dtokfunc_t_ref, cmpfunc_t_ref, void *) ;
40 extern uint32_t avlnode_delete (avlnode *, uint32_t, uint32_t *, void const *, dtokfunc_t_ref, cmpfunc_t_ref, void *) ;
41 
42 extern uint32_t avlnode_iter_nocancel (avlnode *, uint32_t, uint32_t, uint32_t, avliterfunc_t_ref, void *) ;
43 #define avlnode_iter(tree, max, root, f, stuff) (avlnode_iter_nocancel(tree, max, max, root, f, stuff) == (max))
44 extern int avlnode_iter_withcancel (avlnode *, uint32_t, uint32_t, avliterfunc_t_ref, avliterfunc_t_ref, void *) ;
45 
46 #endif
47