1 /* $NetBSD: tfind.c,v 1.2 1999/09/16 11:45:37 lukem 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.
14 #include <sys/cdefs.h>
16 #if defined(LIBC_SCCS) && !defined(lint)
17 __RCSID("$NetBSD: tfind.c,v 1.2 1999/09/16 11:45:37 lukem Exp $");
18 #endif /* LIBC_SCCS and not lint */
20 __FBSDID("$FreeBSD$");
22 #define _SEARCH_PRIVATE
27 * find a node, or return 0
29 * vkey - key to be found
30 * vrootp - address of the tree root
33 tfind(const void *vkey, void * const *vrootp,
34 int (*compar)(const void *, const void *))
36 node_t **rootp = (node_t **)vrootp;
41 while (*rootp != NULL) { /* T1: */
44 if ((r = (*compar)(vkey, (*rootp)->key)) == 0) /* T2: */
45 return *rootp; /* key found */
47 &(*rootp)->llink : /* T3: follow left branch */
48 &(*rootp)->rlink; /* T4: follow right branch */