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59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
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/* $NetBSD: twalk.c,v 1.1 1999/02/22 10:33:16 christos Exp $ */
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/*
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* Tree search generalized from Knuth (6.2.2) Algorithm T just like
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* the AT&T man page says.
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*
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* The node_t structure is for internal use only, lint doesn't grok it.
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*
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* Written by reading the System V Interface Definition, not the code.
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*
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* Totally public domain.
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*/
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#include <sys/cdefs.h>
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#if 0
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#if defined(LIBC_SCCS) && !defined(lint)
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__RCSID("$NetBSD: twalk.c,v 1.1 1999/02/22 10:33:16 christos Exp $");
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#endif /* LIBC_SCCS and not lint */
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#endif
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#include <assert.h>
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#define _SEARCH_PRIVATE
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#include <search.h>
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#include <stdlib.h>
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static void trecurse(const node_t *,
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void (*action)(const void *, VISIT, int), int level);
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/* Walk the nodes of a tree */
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static void
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trecurse(root, action, level)
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const node_t *root; /* Root of the tree to be walked */
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void (*action)(const void *, VISIT, int);
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int level;
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{
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if (root->llink == NULL && root->rlink == NULL)
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(*action)(root, leaf, level);
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else {
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(*action)(root, preorder, level);
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if (root->llink != NULL)
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trecurse(root->llink, action, level + 1);
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(*action)(root, postorder, level);
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if (root->rlink != NULL)
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trecurse(root->rlink, action, level + 1);
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(*action)(root, endorder, level);
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}
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}
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/* Walk the nodes of a tree */
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void
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_DEFUN(twalk, (vroot, action),
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const void *vroot _AND /* Root of the tree to be walked */
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void (*action)(const void *, VISIT, int))
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{
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if (vroot != NULL && action != NULL)
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trecurse(vroot, action, 0);
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}
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