1 /* $NetBSD: hash.c,v 1.2 1995/07/03 21:24:47 cgd Exp $ */
4 * Copyright (c) 1994, 1995 Jochen Pohl
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Jochen Pohl for
19 * 4. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 * $NetBSD: hash.c,v 1.2 1995/07/03 21:24:47 cgd Exp $
42 /* pointer to hash table, initialized in inithash() */
45 static int hash __P((const char *));
48 * Initialize hash table.
53 htab = xcalloc(HSHSIZ2, sizeof (hte_t *));
57 * Compute hash value from a string.
67 for (us = (const u_char *)s; *us != '\0'; us++) {
68 v = (v << sizeof (v)) + *us;
69 v ^= v >> (sizeof (v) * CHAR_BIT - sizeof (v));
75 * Look for a hash table entry. If no hash table entry for the
76 * given name exists and mknew is set, create a new one.
87 for (hte = htab[h]; hte != NULL; hte = hte->h_link) {
88 if (strcmp(hte->h_name, s) == 0)
92 if (hte != NULL || !mknew)
95 /* create a new hte */
96 hte = xalloc(sizeof (hte_t));
97 hte->h_name = xstrdup(s);
98 hte->h_lsym = &hte->h_syms;
99 hte->h_lcall = &hte->h_calls;
100 hte->h_lusym = &hte->h_usyms;
101 hte->h_link = htab[h];
108 * Call function f for each name in the hash table.
112 void (*f) __P((hte_t *));
117 for (i = 0; i < HSHSIZ2; i++) {
118 for (hte = htab[i]; hte != NULL; hte = hte->h_link)