mirror of
git://git.gnupg.org/gnupg.git
synced 2024-12-22 10:19:57 +01:00
82 lines
2.7 KiB
C
82 lines
2.7 KiB
C
/* Binary tree data structure.
|
|
Copyright (C) 2006 Free Software Foundation, Inc.
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef _TSEARCH_H
|
|
#define _TSEARCH_H
|
|
|
|
#if HAVE_TSEARCH
|
|
|
|
/* Get tseach(), tfind(), tdelete(), twalk() declarations. */
|
|
#include <search.h>
|
|
|
|
#else
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/* See <http://www.opengroup.org/susv3xbd/search.h.html>,
|
|
<http://www.opengroup.org/susv3xsh/tsearch.html>
|
|
for details. */
|
|
|
|
typedef enum
|
|
{
|
|
preorder,
|
|
postorder,
|
|
endorder,
|
|
leaf
|
|
}
|
|
VISIT;
|
|
|
|
/* Searches an element in the tree *VROOTP that compares equal to KEY.
|
|
If one is found, it is returned. Otherwise, a new element equal to KEY
|
|
is inserted in the tree and is returned. */
|
|
extern void * tsearch (const void *key, void **vrootp,
|
|
int (*compar) (const void *, const void *));
|
|
|
|
/* Searches an element in the tree *VROOTP that compares equal to KEY.
|
|
If one is found, it is returned. Otherwise, NULL is returned. */
|
|
extern void * tfind (const void *key, void *const *vrootp,
|
|
int (*compar) (const void *, const void *));
|
|
|
|
/* Searches an element in the tree *VROOTP that compares equal to KEY.
|
|
If one is found, it is removed from the tree, and its parent node is
|
|
returned. Otherwise, NULL is returned. */
|
|
extern void * tdelete (const void *key, void **vrootp,
|
|
int (*compar) (const void *, const void *));
|
|
|
|
/* Perform a depth-first, left-to-right traversal of the tree VROOT.
|
|
The ACTION function is called:
|
|
- for non-leaf nodes: 3 times, before the left subtree traversal,
|
|
after the left subtree traversal but before the right subtree traversal,
|
|
and after the right subtree traversal,
|
|
- for leaf nodes: once.
|
|
The arguments passed to ACTION are:
|
|
1. the node; it can be casted to a 'const void * const *', i.e. into a
|
|
pointer to the key,
|
|
2. an indicator which visit of the node this is,
|
|
3. the level of the node in the tree (0 for the root). */
|
|
extern void twalk (const void *vroot,
|
|
void (*action) (const void *, VISIT, int));
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|
|
|
|
#endif /* _TSEARCH_H */
|