xref: /illumos-gate/usr/src/tools/smatch/src/cwchash/hashtable_utility.c (revision 1f5207b7604fb44407eb4342aff613f7c4508508)
1 /* Copyright (C) 2002 Christopher Clark <firstname.lastname@cl.cam.ac.uk> */
2 
3 #include "hashtable.h"
4 #include "hashtable_private.h"
5 #include "hashtable_utility.h"
6 #include <stdlib.h>
7 #include <stdio.h>
8 #include <string.h>
9 
10 /*****************************************************************************/
11 /* hashtable_change
12  *
13  * function to change the value associated with a key, where there already
14  * exists a value bound to the key in the hashtable.
15  * Source due to Holger Schemel.
16  *
17  *  */
18 int
hashtable_change(struct hashtable * h,void * k,void * v)19 hashtable_change(struct hashtable *h, void *k, void *v)
20 {
21     struct entry *e;
22     unsigned int hashvalue, index;
23     hashvalue = hash(h,k);
24     index = indexFor(h->tablelength,hashvalue);
25     e = h->table[index];
26     while (NULL != e)
27     {
28         /* Check hash value to short circuit heavier comparison */
29         if ((hashvalue == e->h) && (h->eqfn(k, e->k)))
30         {
31             free(e->v);
32             e->v = v;
33             return -1;
34         }
35         e = e->next;
36     }
37     return 0;
38 }
39 
40 /*
41  * Copyright (c) 2002, Christopher Clark
42  * All rights reserved.
43  *
44  * Redistribution and use in source and binary forms, with or without
45  * modification, are permitted provided that the following conditions
46  * are met:
47  *
48  * * Redistributions of source code must retain the above copyright
49  * notice, this list of conditions and the following disclaimer.
50  *
51  * * Redistributions in binary form must reproduce the above copyright
52  * notice, this list of conditions and the following disclaimer in the
53  * documentation and/or other materials provided with the distribution.
54  *
55  * * Neither the name of the original author; nor the names of any contributors
56  * may be used to endorse or promote products derived from this software
57  * without specific prior written permission.
58  *
59  *
60  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
61  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
62  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
63  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER
64  * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
65  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
66  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
67  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
68  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
69  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
70  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
71 */
72