1 /* $OpenBSD: look.c,v 1.10 2002/04/26 16:15:16 espie Exp $ */
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Ozan Yigit at York University.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 static char sccsid[] = "@(#)look.c 8.1 (Berkeley) 6/6/93";
41 #include <sys/cdefs.h>
42 __FBSDID("$FreeBSD$");
46 * Facility: m4 macro processor
50 #include <sys/types.h>
59 static void freent(ndptr);
62 hash(const char *name)
66 h = (h << 5) + h + *name++;
71 * find name in the hash table
74 lookup(const char *name)
80 for (p = hashtab[h % HASHSIZE]; p != nil; p = p->nxtptr)
81 if (h == p->hv && STREQ(name, p->name))
87 * hash and create an entry in the hash table.
88 * The new entry is added in front of a hash bucket.
91 addent(const char *name)
97 p = (ndptr) xalloc(sizeof(struct ndblock));
98 p->nxtptr = hashtab[h % HASHSIZE];
99 hashtab[h % HASHSIZE] = p;
100 p->name = xstrdup(name);
108 free((char *) p->name);
110 free((char *) p->defn);
115 * remove an entry from the hashtable
118 remhash(const char *name, int all)
124 mp = hashtab[h % HASHSIZE];
127 if (mp->hv == h && STREQ(mp->name, name)) {
130 freent(hashtab[h % HASHSIZE]);
131 hashtab[h % HASHSIZE] = mp;