NetBSD/usr.bin/m4/look.c

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1993-03-21 12:45:37 +03:00
/*
* Copyright (c) 1989 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ozan Yigit.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)look.c 5.3 (Berkeley) 2/26/91";
#endif /* not lint */
/*
* look.c
* Facility: m4 macro processor
* by: oz
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mdef.h"
#include "extr.h"
/*
* hash - compute hash value using the proverbial
* hashing function. Taken from K&R.
*/
hash (name)
register char *name;
{
register int h = 0;
while (*name)
h += *name++;
return (h % HASHSIZE);
}
/*
* lookup - find name in the hash table
*
*/
ndptr lookup(name)
char *name;
{
register ndptr p;
for (p = hashtab[hash(name)]; p != nil; p = p->nxtptr)
if (strcmp(name, p->name) == 0)
break;
return (p);
}
/*
* addent - hash and create an entry in the hash
* table. The new entry is added in front
* of a hash bucket.
*/
ndptr addent(name)
char *name;
{
register int h;
ndptr p;
h = hash(name);
if ((p = (ndptr) malloc(sizeof(struct ndblock))) != NULL) {
p->nxtptr = hashtab[h];
hashtab[h] = p;
p->name = strdup(name);
}
else
error("m4: no more memory.");
return p;
}
/*
* remhash - remove an entry from the hashtable
*
*/
remhash(name, all)
char *name;
int all;
{
register int h;
register ndptr xp, tp, mp;
h = hash(name);
mp = hashtab[h];
tp = nil;
while (mp != nil) {
if (strcmp(mp->name, name) == 0) {
mp = mp->nxtptr;
if (tp == nil) {
freent(hashtab[h]);
hashtab[h] = mp;
}
else {
xp = tp->nxtptr;
tp->nxtptr = mp;
freent(xp);
}
if (!all)
break;
}
else {
tp = mp;
mp = mp->nxtptr;
}
}
}
/*
* freent - free a hashtable information block
*
*/
freent(p)
ndptr p;
{
if (!(p->type & STATIC)) {
free(p->name);
if (p->defn != null)
free(p->defn);
}
free(p);
}