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 * Written by reading the System V Interface Definition, not the code.
9 * Totally public domain.
12 #include <sys/cdefs.h>
14 #if defined(LIBC_SCCS) && !defined(lint)
15 __RCSID("$NetBSD: tfind.c,v 1.2 1999/09/16 11:45:37 lukem Exp $");
16 #endif /* LIBC_SCCS and not lint */
18 #define _SEARCH_PRIVATE
23 * find a node, or return 0
25 * vkey - key to be found
26 * vrootp - address of the tree root
29 tfind(const void *vkey, posix_tnode * const *rootp,
30 int (*compar)(const void *, const void *))
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 */