1 /* Declarations for System V style searching functions.
2 Copyright (C) 1995-1999, 2000 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public License as
7 published by the Free Software Foundation; either version 2.1 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
30 #if defined __USE_SVID || defined __USE_XOPEN_EXTENDED
31 /* Prototype structure for a linked-list data structure.
32 This is the type used by the `insque' and `remque' functions. */
44 /* Insert ELEM into a doubly-linked list, after PREV. */
45 extern void insque __P ((void *__elem, void *__prev));
47 /* Unlink ELEM from the doubly-linked list that it is in. */
48 extern void remque __P ((void *__elem));
52 /* For use with hsearch(3). */
54 # define __COMPAR_FN_T
55 typedef int (*__compar_fn_t) __PMT ((__const __ptr_t, __const __ptr_t));
58 typedef __compar_fn_t comparison_fn_t;
62 /* Action which shall be performed in the call the hsearch. */
77 /* Opaque type for internal use. */
80 /* Family of hash table handling functions. The functions also
81 have reentrant counterparts ending with _r. The non-reentrant
82 functions all work on a single internal hashing table. */
84 /* Search for entry matching ITEM.key in internal hash table. If
85 ACTION is `FIND' return found entry or signal error by returning
86 NULL. If ACTION is `ENTER' replace existing data (if any) with
88 extern ENTRY *hsearch __P ((ENTRY __item, ACTION __action));
90 /* Create a new hashing table which will at most contain NEL elements. */
91 extern int hcreate __P ((size_t __nel));
93 /* Destroy current internal hashing table. */
94 extern void hdestroy __P ((void));
97 /* Data type for reentrant functions. */
100 struct _ENTRY *table;
105 /* Reentrant versions which can handle multiple hashing tables at the
107 extern int hsearch_r __P ((ENTRY __item, ACTION __action, ENTRY **__retval,
108 struct hsearch_data *__htab));
109 extern int hcreate_r __P ((size_t __nel, struct hsearch_data *__htab));
110 extern void hdestroy_r __P ((struct hsearch_data *__htab));
114 /* The tsearch routines are very interesting. They make many
115 assumptions about the compiler. It assumes that the first field
116 in node must be the "key" field, which points to the datum.
117 Everything depends on that. */
128 /* Search for an entry matching the given KEY in the tree pointed to
129 by *ROOTP and insert a new element if not found. */
130 extern void *tsearch __PMT ((__const void *__key, void **__rootp,
131 __compar_fn_t __compar));
133 /* Search for an entry matching the given KEY in the tree pointed to
134 by *ROOTP. If no matching entry is available return NULL. */
135 extern void *tfind __PMT ((__const void *__key, void *__const *__rootp,
136 __compar_fn_t __compar));
138 /* Remove the element matching KEY from the tree pointed to by *ROOTP. */
139 extern void *tdelete __PMT ((__const void *__key, void **__rootp,
140 __compar_fn_t __compar));
142 #ifndef __ACTION_FN_T
143 # define __ACTION_FN_T
144 typedef void (*__action_fn_t) __PMT ((__const void *__nodep,
149 /* Walk through the whole tree and call the ACTION callback for every node
151 extern void twalk __PMT ((__const void *__root, __action_fn_t __action));
154 /* Callback type for function to free a tree node. If the keys are atomic
155 data this function should do nothing. */
156 typedef void (*__free_fn_t) __PMT ((void *__nodep));
158 /* Destroy the whole tree, call FREEFCT for each node or leaf. */
159 extern void tdestroy __PMT ((void *__root, __free_fn_t __freefct));
163 /* Perform linear search for KEY by comparing by COMPAR in an array
164 [BASE,BASE+NMEMB*SIZE). */
165 extern void *lfind __PMT ((__const void *__key, __const void *__base,
166 size_t *__nmemb, size_t __size,
167 __compar_fn_t __compar));
169 /* Perform linear search for KEY by comparing by COMPAR function in
170 array [BASE,BASE+NMEMB*SIZE) and insert entry if not found. */
171 extern void *lsearch __PMT ((__const void *__key, void *__base,
172 size_t *__nmemb, size_t __size,
173 __compar_fn_t __compar));
177 #endif /* search.h */