| | 1 | /* $NetBSD: twalk.c,v 1.1 1999/02/22 10:33:16 christos Exp $ */ |
| | 2 | |
| | 3 | /* |
| | 4 | * Tree search generalized from Knuth (6.2.2) Algorithm T just like |
| | 5 | * the AT&T man page says. |
| | 6 | * |
| | 7 | * The node_t structure is for internal use only, lint doesn't grok it. |
| | 8 | * |
| | 9 | * Written by reading the System V Interface Definition, not the code. |
| | 10 | * |
| | 11 | * Totally public domain. |
| | 12 | */ |
| | 13 | |
| | 14 | #include <sys/cdefs.h> |
| | 15 | #if 0 |
| | 16 | #if defined(LIBC_SCCS) && !defined(lint) |
| | 17 | __RCSID("$NetBSD: twalk.c,v 1.1 1999/02/22 10:33:16 christos Exp $"); |
| | 18 | #endif /* LIBC_SCCS and not lint */ |
| | 19 | #endif |
| | 20 | __FBSDID("$FreeBSD: src/lib/libc/stdlib/twalk.c,v 1.5 2003/01/05 02:43:18 tjr Exp $"); |
| | 21 | |
| | 22 | #define _SEARCH_PRIVATE |
| | 23 | #include <search.h> |
| | 24 | #include <stdlib.h> |
| | 25 | |
| | 26 | static void trecurse(const node_t *, |
| | 27 | void (*action)(const void *, VISIT, int), int level); |
| | 28 | |
| | 29 | /* Walk the nodes of a tree */ |
| | 30 | static void |
| | 31 | trecurse(root, action, level) |
| | 32 | const node_t *root; /* Root of the tree to be walked */ |
| | 33 | void (*action)(const void *, VISIT, int); |
| | 34 | int level; |
| | 35 | { |
| | 36 | |
| | 37 | if (root->llink == NULL && root->rlink == NULL) |
| | 38 | (*action)(root, leaf, level); |
| | 39 | else { |
| | 40 | (*action)(root, preorder, level); |
| | 41 | if (root->llink != NULL) |
| | 42 | trecurse(root->llink, action, level + 1); |
| | 43 | (*action)(root, postorder, level); |
| | 44 | if (root->rlink != NULL) |
| | 45 | trecurse(root->rlink, action, level + 1); |
| | 46 | (*action)(root, endorder, level); |
| | 47 | } |
| | 48 | } |
| | 49 | |
| | 50 | /* Walk the nodes of a tree */ |
| | 51 | void |
| | 52 | twalk(vroot, action) |
| | 53 | const void *vroot; /* Root of the tree to be walked */ |
| | 54 | void (*action)(const void *, VISIT, int); |
| | 55 | { |
| | 56 | if (vroot != NULL && action != NULL) |
| | 57 | trecurse(vroot, action, 0); |
| | 58 | } |
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