2 * Tree search generalized from Knuth (6.2.2) Algorithm T just like
3 * the AT&T man page says.
5 * The node_t structure is for internal use only, lint doesn't grok it.
7 * Written by reading the System V Interface Definition, not the code.
9 * Totally public domain.
11 * $NetBSD: tfind.c,v 1.2 1999/09/16 11:45:37 lukem Exp $
12 * $FreeBSD: src/lib/libc/stdlib/tfind.c,v 1.5 2003/01/05 02:43:18 tjr Exp $
13 * $DragonFly: src/lib/libc/stdlib/tsearch.c,v 1.6 2005/11/24 17:18:30 swildner Exp $
16 #define _SEARCH_PRIVATE
21 * find a node, or return 0
24 * vkey: key to be found
25 * vrootp: address of the tree root
28 tfind(const void *vkey, void * const *vrootp,
29 int (*compar)(const void *, const void *))
31 node_t **rootp = (node_t **)vrootp;
36 while (*rootp != NULL) { /* T1: */
39 if ((r = (*compar)(vkey, (*rootp)->key)) == 0) /* T2: */
40 return *rootp; /* key found */
42 &(*rootp)->llink : /* T3: follow left branch */
43 &(*rootp)->rlink; /* T4: follow right branch */