2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Ozan Yigit at York University.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)look.c 8.1 (Berkeley) 6/6/93
37 * $OpenBSD: look.c,v 1.10 2002/04/26 16:15:16 espie Exp $
38 * $FreeBSD: src/usr.bin/m4/look.c,v 1.7 2002/07/15 02:15:12 jmallett Exp $
39 * $DragonFly: src/usr.bin/m4/look.c,v 1.3 2006/12/27 21:29:02 pavalos Exp $
44 * Facility: m4 macro processor
48 #include <sys/types.h>
57 static void freent(ndptr);
60 hash(const char *name)
64 h = (h << 5) + h + *name++;
69 * find name in the hash table
72 lookup(const char *name)
78 for (p = hashtab[h % HASHSIZE]; p != nil; p = p->nxtptr)
79 if (h == p->hv && STREQ(name, p->name))
85 * hash and create an entry in the hash table.
86 * The new entry is added in front of a hash bucket.
89 addent(const char *name)
95 p = (ndptr) xalloc(sizeof(struct ndblock));
96 p->nxtptr = hashtab[h % HASHSIZE];
97 hashtab[h % HASHSIZE] = p;
98 p->name = xstrdup(name);
106 free((char *) p->name);
108 free((char *) p->defn);
113 * remove an entry from the hashtable
116 remhash(const char *name, int all)
122 mp = hashtab[h % HASHSIZE];
125 if (mp->hv == h && STREQ(mp->name, name)) {
128 freent(hashtab[h % HASHSIZE]);
129 hashtab[h % HASHSIZE] = mp;