Line data Source code
1 : /* Copyright (C) 2002, 2004 Christopher Clark <firstname.lastname@cl.cam.ac.uk> */
2 :
3 : #ifndef __HASHTABLE_ITR_CWC22__
4 : #define __HASHTABLE_ITR_CWC22__
5 : #include "hashtable.h"
6 : #include "hashtable_private.h" /* needed to enable inlining */
7 :
8 : /*****************************************************************************/
9 : /* This struct is only concrete here to allow the inlining of two of the
10 : * accessor functions. */
11 : struct hashtable_itr
12 : {
13 : struct hashtable *h;
14 : struct entry *e;
15 : struct entry *parent;
16 : unsigned int index;
17 : };
18 :
19 :
20 : /*****************************************************************************/
21 : /* hashtable_iterator
22 : */
23 :
24 : struct hashtable_itr *
25 : hashtable_iterator(struct hashtable *h);
26 :
27 : /*****************************************************************************/
28 : /* hashtable_iterator_key
29 : * - return the value of the (key,value) pair at the current position */
30 :
31 : static inline void *
32 : hashtable_iterator_key(struct hashtable_itr *i)
33 : {
34 : return i->e->k;
35 : }
36 :
37 : /*****************************************************************************/
38 : /* value - return the value of the (key,value) pair at the current position */
39 :
40 : static inline void *
41 : hashtable_iterator_value(struct hashtable_itr *i)
42 : {
43 0 : return i->e->v;
44 : }
45 :
46 : /*****************************************************************************/
47 : /* advance - advance the iterator to the next element
48 : * returns zero if advanced to end of table */
49 :
50 : int
51 : hashtable_iterator_advance(struct hashtable_itr *itr);
52 :
53 : /*****************************************************************************/
54 : /* remove - remove current element and advance the iterator to the next element
55 : * NB: if you need the value to free it, read it before
56 : * removing. ie: beware memory leaks!
57 : * returns zero if advanced to end of table */
58 :
59 : int
60 : hashtable_iterator_remove(struct hashtable_itr *itr);
61 :
62 : /*****************************************************************************/
63 : /* search - overwrite the supplied iterator, to point to the entry
64 : * matching the supplied key.
65 : h points to the hashtable to be searched.
66 : * returns zero if not found. */
67 : int
68 : hashtable_iterator_search(struct hashtable_itr *itr,
69 : struct hashtable *h, void *k);
70 :
71 : #define DEFINE_HASHTABLE_ITERATOR_SEARCH(fnname, keytype) \
72 : int fnname (struct hashtable_itr *i, struct hashtable *h, keytype *k) \
73 : { \
74 : return (hashtable_iterator_search(i,h,k)); \
75 : }
76 :
77 :
78 :
79 : #endif /* __HASHTABLE_ITR_CWC22__*/
80 :
81 : /*
82 : * Copyright (c) 2002, 2004, Christopher Clark
83 : * All rights reserved.
84 : *
85 : * Redistribution and use in source and binary forms, with or without
86 : * modification, are permitted provided that the following conditions
87 : * are met:
88 : *
89 : * * Redistributions of source code must retain the above copyright
90 : * notice, this list of conditions and the following disclaimer.
91 : *
92 : * * Redistributions in binary form must reproduce the above copyright
93 : * notice, this list of conditions and the following disclaimer in the
94 : * documentation and/or other materials provided with the distribution.
95 : *
96 : * * Neither the name of the original author; nor the names of any contributors
97 : * may be used to endorse or promote products derived from this software
98 : * without specific prior written permission.
99 : *
100 : *
101 : * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
102 : * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
103 : * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
104 : * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
105 : * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
106 : * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
107 : * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
108 : * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
109 : * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
110 : * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
111 : * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
112 : */
|