1 /* $NetBSD: tfind.c,v 1.2 1999/09/16 11:45:37 lukem Exp $ */
2 /* $FreeBSD: src/lib/libc/stdlib/tfind.c,v 1.1.2.1 2000/08/17 07:38:39 jhb Exp $ */
5 * Tree search generalized from Knuth (6.2.2) Algorithm T just like
6 * the AT&T man page says.
8 * The node_t structure is for internal use only, lint doesn't grok it.
10 * Written by reading the System V Interface Definition, not the code.
12 * Totally public domain.
15 #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 */
21 #define _SEARCH_PRIVATE
25 /* find a node, or return 0 */
27 tfind(vkey, vrootp, compar)
28 const void *vkey; /* key to be found */
29 void **vrootp; /* address of the tree root */
30 int (*compar) __P((const void *, const void *));
32 node_t **rootp = (node_t **)vrootp;
37 while (*rootp != NULL) { /* T1: */
40 if ((r = (*compar)(vkey, (*rootp)->key)) == 0) /* T2: */
41 return *rootp; /* key found */
43 &(*rootp)->llink : /* T3: follow left branch */
44 &(*rootp)->rlink; /* T4: follow right branch */