f14fb60209
* Updating common/lib * Updating lib/csu * Updating lib/libc * Updating libexec/ld.elf_so * Corrected test on __minix in featuretest to actually follow the meaning of the comment. * Cleaned up _REENTRANT-related defintions. * Disabled -D_REENTRANT for libfetch * Removing some unneeded __NBSD_LIBC defines and tests Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
/* $NetBSD: twalk.c,v 1.4 2012/03/20 16:38:45 matt Exp $ */
|
|
|
|
/*
|
|
* Tree search generalized from Knuth (6.2.2) Algorithm T just like
|
|
* the AT&T man page says.
|
|
*
|
|
* The node_t structure is for internal use only, lint doesn't grok it.
|
|
*
|
|
* Written by reading the System V Interface Definition, not the code.
|
|
*
|
|
* Totally public domain.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
__RCSID("$NetBSD: twalk.c,v 1.4 2012/03/20 16:38:45 matt Exp $");
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
#include <assert.h>
|
|
#define _SEARCH_PRIVATE
|
|
#include <search.h>
|
|
#include <stdlib.h>
|
|
|
|
typedef void (*cmp_fn_t)(const void *, VISIT, int);
|
|
|
|
/* Walk the nodes of a tree */
|
|
static void
|
|
trecurse(const node_t *root, /* Root of the tree to be walked */
|
|
cmp_fn_t action, int level)
|
|
{
|
|
_DIAGASSERT(root != NULL);
|
|
_DIAGASSERT(action != NULL);
|
|
|
|
if (root->llink == NULL && root->rlink == NULL)
|
|
(*action)(root, leaf, level);
|
|
else {
|
|
(*action)(root, preorder, level);
|
|
if (root->llink != NULL)
|
|
trecurse(root->llink, action, level + 1);
|
|
(*action)(root, postorder, level);
|
|
if (root->rlink != NULL)
|
|
trecurse(root->rlink, action, level + 1);
|
|
(*action)(root, endorder, level);
|
|
}
|
|
}
|
|
|
|
/* Walk the nodes of a tree */
|
|
void
|
|
twalk(const void *vroot, cmp_fn_t action) /* Root of the tree to be walked */
|
|
{
|
|
if (vroot != NULL && action != NULL)
|
|
trecurse(vroot, action, 0);
|
|
}
|