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/* A GNU-like <search.h>.
Copyright (C) 2007 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
#ifndef _GL_SEARCH_H
/* The include_next requires a split double-inclusion guard. */
#if @HAVE_SEARCH_H@
# @INCLUDE_NEXT@ @NEXT_SEARCH_H@
#endif
#ifndef _GL_SEARCH_H
#define _GL_SEARCH_H
/* The definition of GL_LINK_WARNING is copied here. */
#ifdef __cplusplus
extern "C" {
#endif
#if @GNULIB_TSEARCH@
# if !@HAVE_TSEARCH@
/* 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));
# endif
#elif defined GNULIB_POSIXCHECK
# undef tsearch
# define tsearch(k,v,c) \
(GL_LINK_WARNING ("tsearch is unportable - " \
"use gnulib module tsearch for portability"), \
tsearch (k, v, c))
# undef tfind
# define tfind(k,v,c) \
(GL_LINK_WARNING ("tfind is unportable - " \
"use gnulib module tsearch for portability"), \
tfind (k, v, c))
# undef tdelete
# define tdelete(k,v,c) \
(GL_LINK_WARNING ("tdelete is unportable - " \
"use gnulib module tsearch for portability"), \
tdelete (k, v, c))
# undef twalk
# define twalk(v,a) \
(GL_LINK_WARNING ("twalk is unportable - " \
"use gnulib module tsearch for portability"), \
twalk (v, a))
#endif
#ifdef __cplusplus
}
#endif
#endif /* _GL_SEARCH_H */
#endif /* _GL_SEARCH_H */
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