4b087712af
* Provide some GNUisms as extensions. * Provide dynamically growable string space. * Make define(defn(foo)) work correctly for builtins. (The current version is supposed to be capable of satisfying autoconf.) All still relevant NetBSD changes have been preserved in this version, and formatting and style fixes have been applied in various places. Thanks to Masao Uebayashi <uebayasi@soum.co.jp> for pointing this out.
158 lines
3.8 KiB
C
158 lines
3.8 KiB
C
/* $NetBSD: look.c,v 1.7 2001/11/14 06:16:09 tv Exp $ */
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/* $OpenBSD: look.c,v 1.8 2001/09/17 08:11:13 espie Exp $ */
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ozan Yigit at York University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)look.c 8.1 (Berkeley) 6/6/93";
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#else
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__RCSID("$NetBSD: look.c,v 1.7 2001/11/14 06:16:09 tv Exp $");
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#endif
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#endif /* not lint */
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/*
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* look.c
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* Facility: m4 macro processor
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* by: oz
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*/
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <string.h>
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#include "mdef.h"
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#include "stdd.h"
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#include "extern.h"
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static void freent __P((ndptr));
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unsigned
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hash(name)
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const char *name;
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{
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unsigned int h = 0;
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while (*name)
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h = (h << 5) + h + *name++;
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return (h);
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}
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/*
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* find name in the hash table
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*/
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ndptr
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lookup(name)
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const char *name;
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{
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ndptr p;
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unsigned int h;
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h = hash(name);
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for (p = hashtab[h % HASHSIZE]; p != nil; p = p->nxtptr)
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if (h == p->hv && STREQ(name, p->name))
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break;
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return (p);
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}
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/*
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* hash and create an entry in the hash table.
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* The new entry is added in front of a hash bucket.
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*/
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ndptr
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addent(name)
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const char *name;
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{
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unsigned int h;
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ndptr p;
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h = hash(name);
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p = (ndptr) xalloc(sizeof(struct ndblock));
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p->nxtptr = hashtab[h % HASHSIZE];
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hashtab[h % HASHSIZE] = p;
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p->name = xstrdup(name);
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p->hv = h;
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return p;
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}
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static void
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freent(p)
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ndptr p;
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{
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free((char *) p->name);
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if (p->defn != null)
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free((char *) p->defn);
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free((char *) p);
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}
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/*
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* remove an entry from the hashtable
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*/
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void
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remhash(name, all)
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const char *name;
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int all;
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{
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unsigned int h;
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ndptr xp, tp, mp;
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h = hash(name);
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mp = hashtab[h % HASHSIZE];
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tp = nil;
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while (mp != nil) {
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if (mp->hv == h && STREQ(mp->name, name)) {
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mp = mp->nxtptr;
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if (tp == nil) {
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freent(hashtab[h % HASHSIZE]);
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hashtab[h % HASHSIZE] = mp;
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}
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else {
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xp = tp->nxtptr;
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tp->nxtptr = mp;
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freent(xp);
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}
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if (!all)
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break;
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}
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else {
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tp = mp;
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mp = mp->nxtptr;
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}
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}
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}
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