/*      $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');
        }
}