1 /* $NetBSD: tfind.c,v 1.3.18.2 2005/03/23 11:12:21 tron Exp $ */
4 * Tree search generalized from Knuth (6.2.2) Algorithm T just like
5 * the AT&T man page says.
7 * The node_t structure is for internal use only, lint doesn't grok it.
9 * Written by reading the System V Interface Definition, not the code.
11 * Totally public domain.
15 #define _SEARCH_PRIVATE
20 /* find a node, or return 0 */
22 tfind(const void *vkey,
24 int (*compar) (const void *, const void *))
26 node_t * const *rootp = (node_t * const*)vrootp;
31 while (*rootp != NULL) { /* T1: */
34 if ((r = (*compar)(vkey, (*rootp)->key)) == 0) /* T2: */
35 return *rootp; /* key found */
37 &(*rootp)->llink : /* T3: follow left branch */
38 &(*rootp)->rlink; /* T4: follow right branch */