xref: /src/games/adventure/vocab.c

/*	$NetBSD: vocab.c,v 1.16 2021/05/02 12:50:43 rillig Exp $	*/

/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * The game adventure was originally written in Fortran by Will Crowther
 * and Don Woods.  It was later translated to C and enhanced by Jim
 * Gillogly.  This code is derived from software contributed to Berkeley
 * by Jim Gillogly at The Rand Corporation.
 *
 * 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. 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.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)vocab.c	8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: vocab.c,v 1.16 2021/05/02 12:50:43 rillig Exp $");
#endif
#endif				/* not lint */

/*      Re-coding of advent in C: data structure routines               */

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include "hdr.h"
#include "extern.h"

void
destroy(int object)
{
	move(object, 0);
}

void
juggle(int object)
{
	int     i, j;

	i = place[object];
	j = fixed[object];
	move(object, i);
	move(object + 100, j);
}

void
move(int object, int where)
{
	int     from;

	if (object <= 100)
		from = place[object];
	else
		from = fixed[object - 100];
	if (from > 0 && from <= 300)
		carry(object, from);
	drop(object, where);
}

int
put(int object, int where, int pval)
{
	move(object, where);
	return (-1 - pval);
}

void
carry(int object, int where)
{
	int     temp;

	if (object <= 100) {
		if (place[object] == -1)
			return;
		place[object] = -1;
		holding++;
	}
	if (atloc[where] == object) {
		atloc[where] = links[object];
		return;
	}
	for (temp = atloc[where]; links[temp] != object; temp = links[temp]);
	links[temp] = links[object];
}


void
drop(int object, int where)
{
	if (object > 100)
		fixed[object - 100] = where;
	else {
		if (place[object] == -1)
			holding--;
		place[object] = where;
	}
	if (where <= 0)
		return;
	links[object] = atloc[where];
	atloc[where] = object;
}

/* look up or store a word      */
/* -2 for store, -1 for user word, >=0 for canned lookup */
/* used for storing only        */
int
vocab(const char *word, int type, int value)
{
	int     adr;
	const char *s;
	char   *t;
	int     hash, i;
	struct hashtab *h;

	for (hash = 0, s = word, i = 0; i < 5 && *s; i++) /* some kind of hash*/
		hash += *s++;	/* add all chars in the word    */
	hash = (hash * 3719) & 077777;	/* pulled that one out of a hat */
	hash %= HTSIZE;		/* put it into range of table   */

	for (adr = hash;; adr++) {	/* look for entry in table      */
		if (adr == HTSIZE)
			adr = 0;/* wrap around                  */
		h = &voc[adr];	/* point at the entry           */
		switch (type) {
		case -2:	/* fill in entry                */
			if (h->val)	/* already got an entry?        */
				goto exitloop2;
			h->val = value;
			h->atab = malloc(length(word));
			if (h->atab == NULL)
				err(1, NULL);
			for (s = word, t = h->atab; *s;)
				*t++ = *s++ ^ '=';
			*t = 0 ^ '=';
			/* encrypt slightly to thwart core reader       */
			/* printf("Stored \"%s\" (%d ch) as entry %d\n",   */
			/* word, length(word), adr);               */
			return (0);	/* entry unused                 */
		case -1:	/* looking up user word         */
			if (h->val == 0)
				return (-1);	/* not found    */
			for (s = word, t = h->atab; *t ^ '=';)
				if ((*s++ ^ '=') != *t++)
					goto exitloop2;
			if ((*s ^ '=') != *t && s - word < 5)
				goto exitloop2;
			/* the word matched o.k.                        */
			return (h->val);
		default:	/* looking up known word        */
			if (h->val == 0)
				errx(1,"Unable to find %s in vocab", word);
			for (s = word, t = h->atab; *t ^ '=';)
				if ((*s++ ^ '=') != *t++)
					goto exitloop2;
			/* the word matched o.k.                        */
			if (h->val / 1000 != type)
				continue;
			return (h->val % 1000);
		}

exitloop2:			/* hashed entry does not match  */
		if (adr + 1 == hash || hash == 0)
			errx(1,"Hash table overflow");
	}
}

/* print hash table (for debugging)             */
static __unused void
prht(void)
{
	int     i, j, l;
	char   *c;
	struct hashtab *h;
	for (i = 0; i < HTSIZE / 10 + 1; i++) {
		printf("%4d", i * 10);
		for (j = 0; j < 10; j++) {
			if (i * 10 + j >= HTSIZE)
				break;
			h = &voc[i * 10 + j];
			putchar(' ');
			if (h->val == 0) {
				printf("-----");
				continue;
			}
			for (l = 0, c = h->atab; l < 5; l++)
				if ((*c ^ '='))
					putchar(*c++ ^ '=');
				else
					putchar(' ');
		}
		putchar('\n');
	}
}