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
26 /* find a node, or return 0 */
28 tfind(vkey, vrootp, compar)
29 const void *vkey; /* key to be found */
30 void * const *vrootp; /* address of the tree root */
31 int (*compar)(const void *, const void *);
33 node_t **rootp = (node_t **)vrootp;
38 while (*rootp != NULL) { /* T1: */
41 if ((r = (*compar)(vkey, (*rootp)->key)) == 0) /* T2: */
42 return *rootp; /* key found */
44 &(*rootp)->llink : /* T3: follow left branch */
45 &(*rootp)->rlink; /* T4: follow right branch */