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 extern 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 extern inline void * 41 hashtable_iterator_value(struct hashtable_itr *i) 42 { 43 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 */