io.c

/*-
 * 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.
 *
 * @(#)io.c	8.1 (Berkeley) 5/31/93
 * $FreeBSD: src/games/adventure/io.c,v 1.8.2.1 2001/03/05 11:43:11 kris Exp $
 */

/* Re-coding of advent in C: file i/o and user i/o */

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

static int next(void);
static void rdesc(int);
static void rdflt(void);
static void rhints(void);
static void rliq(void);
static void rlocs(void);
static int rnum(void);
static void rtrav(void);
static void rvoc(void);
#ifdef DEBUG
static void twrite(int);
#endif

/* Get command from user. No prompt, usually. */
void
getin(char **wrd1, char **wrd2)
{
	char *s;
	static char wd1buf[MAXSTR], wd2buf[MAXSTR];
	int first, numch;

	*wrd1 = wd1buf;			/* return ptr to internal string */
	*wrd2 = wd2buf;
	wd2buf[0] = 0;			/* in case it isn't set here */
	for (s = wd1buf, first = 1, numch = 0;;) {
		if ((*s = getchar()) >= 'A' && *s <= 'Z')
			*s = *s - ('A' - 'a');	/* convert to upper case */
		switch (*s) {		/* start reading from user */
		case '\n':
			*s = 0;
			return;
		case ' ':
			if (s == wd1buf || s == wd2buf)	/* initial blank */
				continue;
			*s = 0;
			if (first) {	/* finished 1st wd; start 2nd */
				first = numch = 0;
				s = wd2buf;
				break;
			} else {	/* finished 2nd word */
				FLUSHLINE;
				*s = 0;
				return;
			}
		case EOF:
			printf("user closed input stream, quitting...\n");
			exit(0);
		default:
			if (++numch >= MAXSTR) {	/* string too long */
				printf("Give me a break!!\n");
				wd1buf[0] = wd2buf[0] = 0;
				FLUSHLINE;
				return;
			}
			s++;
		}
	}
}

/* confirm with rspeak */
int
yes(int x, int y, int z)
{
	int result;
	int ch;

	result = FALSE;
	for (;;) {
		rspeak(x);	/* tell him what we want */
		if ((ch = getchar()) == 'y')
			result = TRUE;
		else if (ch == 'n')
			result = FALSE;
		else if (ch == EOF) {
			printf("user closed input stream, quitting...\n");
			exit(0);
		}
		FLUSHLINE;
		if (ch == 'y' || ch == 'n')
			break;
		printf("Please answer the question.\n");
	}
	if (result == TRUE)
		rspeak(y);
	if (result == FALSE)
		rspeak(z);
	return (result);
}

/* confirm with mspeak */
int
yesm(int x, int y, int z)
{
	int result;
	int ch;

	result = FALSE;
	for (;;) {
		mspeak(x);	/* tell him what we want */
		if ((ch = getchar()) == 'y')
			result = TRUE;
		else if (ch == 'n')
			result = FALSE;
		else if (ch == EOF) {
			printf("user closed input stream, quitting...\n");
			exit(0);
		}
		FLUSHLINE;
		if (ch == 'y' || ch == 'n')
			break;
		printf("Please answer the question.\n");
	}
	if (result == TRUE)
		mspeak(y);
	if (result == FALSE)
		mspeak(z);
	return (result);
}

/* FILE *inbuf, *outbuf; */

char *inptr;				/* Pointer into virtual disk */

int outsw = 0;				/* putting stuff to data file? */

const char iotape[] = "Ax3F'\003tt$8h\315qer*h\017nGKrX\207:!l";
const char *tape = iotape;		/* pointer to encryption tape */

/* next virtual char, bump adr */
static int
next(void)
{
	int ch;

	ch = (*inptr ^ random()) & 0xFF; /* Decrypt input data */
	if (outsw) {			/* putting data in tmp file */
		if (*tape == 0)
			tape = iotape;	/* rewind encryption tape */
		*inptr = ch ^ *tape++;	/* re-encrypt and replace value */
	}
	inptr++;
	return (ch);
}

char breakch;				/* tell which char ended rnum */

/* "read" data from virtual file */
void
rdata(void)
{
	int sect;
	char ch;

	inptr = data_file;		/* Pointer to virtual data file */
	srandom(SEED);			/* which is lightly encrypted. */

	clsses = 1;
	for (;;) {			/* read data sections */
		sect = next() - '0';	/* 1st digit of section number */
#ifdef VERBOSE
		printf("Section %c", sect + '0');
#endif
		if ((ch = next()) != LF) {	/* is there a second digit? */
			FLUSHLF;
#ifdef VERBOSE
			putchar(ch);
#endif
			sect = 10 * sect + ch - '0';
		}
#ifdef VERBOSE
		putchar('\n');
#endif
		switch (sect) {
		case 0:		/* finished reading database */
			return;
		case 1:		/* long form descriptions */
			rdesc(1);
			break;
		case 2:		/* short form descriptions */
			rdesc(2);
			break;
		case 3:		/* travel table */
			rtrav();
			break;
		case 4:		/* vocabulary */
			rvoc();
			break;
		case 5:		/* object descriptions */
			rdesc(5);
			break;
		case 6:		/* arbitrary messages */
			rdesc(6);
			break;
		case 7:		/* object locations */
			rlocs();
			break;
		case 8:		/* action defaults */
			rdflt();
			break;
		case 9:		/* liquid assets */
			rliq();
			break;
		case 10:	/* class messages */
			rdesc(10);
			break;
		case 11:	/* hints */
			rhints();
			break;
		case 12:	/* magic messages */
			rdesc(12);
			break;
		default:
			printf("Invalid data section number: %d\n", sect);
			for (;;)
				putchar(next());
		}
		if (breakch != LF)	/* routines return after "-1" */
			FLUSHLF;
	}
}

char nbf[12];

/* read initial location num */
static int
rnum(void)
{
	char *s;

	tape = iotape;		/* restart encryption tape */
	for (s = nbf, *s = 0;; s++)
		if ((*s = next()) == TAB || *s == '\n' || *s == LF)
			break;
	breakch = *s;		/* save char for rtrav() */
	*s = 0;			/* got the number as ascii */
	if (nbf[0] == '-')	/* end of data */
		return (-1);
	return (atoi(nbf));	/* convert it to integer */
}

char *seekhere;

/* read description-format msgs */
static void
rdesc(int sect)
{
	int locc;
	char *seekstart, *maystart;

	seekhere = inptr;		/* Where are we in virtual file? */
	outsw = 1;			/* these msgs go into tmp file */
	for (oldloc = -1, seekstart = seekhere;;) {
		maystart = inptr;	/* maybe starting new entry */
		if ((locc = rnum()) != oldloc && oldloc >= 0 /* finished msg */
		    /* unless sect 5 */
		    && !(sect == 5 && (locc == 0 || locc >= 100))) {
			switch (sect) {	/* now put it into right table */
			case 1:		/* long descriptions */
				ltext[oldloc].seekadr = seekhere;
				ltext[oldloc].txtlen = maystart - seekstart;
				break;
			case 2:		/* short descriptions */
				stext[oldloc].seekadr = seekhere;
				stext[oldloc].txtlen = maystart - seekstart;
				break;
			case 5:		/* object descriptions */
				ptext[oldloc].seekadr = seekhere;
				ptext[oldloc].txtlen = maystart - seekstart;
				break;
			case 6:		/* random messages */
				if (oldloc > RTXSIZ)
					errx(1, "Too many random msgs");
				rtext[oldloc].seekadr = seekhere;
				rtext[oldloc].txtlen = maystart - seekstart;
				break;
			case 10:	/* class messages */
				ctext[clsses].seekadr = seekhere;
				ctext[clsses].txtlen = maystart - seekstart;
				cval[clsses++] = oldloc;
				break;
			case 12:	/* magic messages */
				if (oldloc > MAGSIZ)
					errx(1, "Too many magic msgs");
				mtext[oldloc].seekadr = seekhere;
				mtext[oldloc].txtlen = maystart - seekstart;
				break;
			default:
				errx(1, "rdesc called with bad section");
			}
			seekhere += maystart - seekstart;
		}
		if (locc < 0) {
			outsw = 0;	/* turn off output */
			seekhere += 3;	/* -1<delimiter> */
			return;
		}
		if (sect != 5 || (locc > 0 && locc < 100)) {
			if (oldloc != locc)	/* starting a new message */
				seekstart = maystart;
			oldloc = locc;
		}
		FLUSHLF;		/* scan the line */
	}
}

/* read travel table */
static void
rtrav(void)
{
	int locc;
	struct travlist *t;
	char *s;
	char buf[12];
	int len, m, n, entries;

	entries = 0;
	t = NULL;
	for (oldloc = -1;;) {		/* get another line */
		/* end of entry */
		if ((locc = rnum()) != oldloc && oldloc >= 0) {
			t->next = 0;	/* terminate the old entry */
#if DEBUG
			printf("%d:%d entries\n", oldloc, entries);
			twrite(oldloc);
#endif
		}
		if (locc == -1)
			return;
		if (locc != oldloc) {	/* getting a new entry */
			t = travel[locc] = malloc(sizeof(*t));
			if (t == NULL)
				errx(1, "Out of memory!");
			/* printf("New travel list for %d\n", locc); */
			entries = 0;
			oldloc = locc;
		}
		for (s = buf;; s++)		/* get the newloc number /ASCII */
			if ((*s = next()) == TAB || *s == LF)
				break;
		*s = 0;
		len = strlen(buf);	/* quad long number handling */
		/* printf("Newloc: %s (%d chars)\n", buf, len); */
		if (len < 4) {		/* no "m" conditions */
			m = 0;
			n = atoi(buf);	/* newloc mod 1000 = newloc */
		} else {		/* a long integer */
			n = atoi(buf + len - 3);
			buf[len - 3] = 0;	/* terminate newloc/1000 */
			m = atoi(buf);
		}
		while (breakch != LF) {	/* only do one line at a time */
			if (entries++) {
				t = t->next = malloc(sizeof(*t));
				if (t == NULL)
					errx(1, "Out of memory!");
			}
			t->tverb = rnum();	/* get verb from the file */
			t->tloc = n;		/* table entry mod 1000 */
			t->conditions = m;	/* table entry / 1000 */
			/* printf("entry %d for %d\n", entries, locc); */
		}
	}
}

#ifdef DEBUG

/* travel options from this loc */
static void
twrite(int loq)
{
	struct travlist *t;

	printf("If");
	speak(&ltext[loq]);
	printf("then\n");
	for (t = travel[loq]; t != NULL; t = t->next) {
		printf("verb %d takes you to ", t->tverb);
		if (t->tloc <= 300)
			speak(&ltext[t->tloc]);
		else if (t->tloc <= 500)
			printf("special code %d\n", t->tloc - 300);
		else
			rspeak(t->tloc - 500);
		printf("under conditions %d\n", t->conditions);
	}
}
#endif /* DEBUG */

/* read the vocabulary */
static void
rvoc(void)
{
	char *s;
	int rv_index;
	char buf[6];

	for (;;) {
		rv_index = rnum();
		if (rv_index < 0)
			break;
		for (s = buf, *s = 0;; s++)	/* get the word */
			if ((*s = next()) == TAB || *s == '\n' || *s == LF
			    || *s == ' ')
				break;
		/* terminate word with newline, LF, tab, blank */
		if (*s != '\n' && *s != LF)
			FLUSHLF;		/* can be comments */
		*s = 0;
		/* printf("\"%s\"=%d\n", buf, rv_index); */
		vocab(buf, -2, rv_index);
	}
}

/* initial object locations */
static void
rlocs(void)
{
	for (;;) {
		if ((obj = rnum()) < 0)
			break;
		plac[obj] = rnum();	/* initial loc for this obj */
		if (breakch == TAB)	/* there's another entry */
			fixd[obj] = rnum();
		else
			fixd[obj] = 0;
	}
}

/* default verb messages */
static void
rdflt(void)
{
	for (;;) {
		if ((verb = rnum()) < 0)
			break;
		actspk[verb] = rnum();
	}
}

/* liquid assets &c: cond bits */
static void
rliq(void)
{
	int bitnum;

	for (;;) {			/* read new bit list */
		if ((bitnum = rnum()) < 0)
			break;
		for (;;) {		/* read locs for bits */
			cond[rnum()] |= setbit[bitnum];
			if (breakch == LF)
				break;
		}
	}
}

static void
rhints(void)
{
	int hintnum, i;

	hntmax = 0;
	for (;;) {
		if ((hintnum = rnum()) < 0)
			break;
		for (i = 1; i < 5; i++)
			hints[hintnum][i] = rnum();
		if (hintnum > hntmax)
			hntmax = hintnum;
	}
}

void
rspeak(int msg)
{
	if (msg != 0)
		speak(&rtext[msg]);
}

void
mspeak(int msg)
{
	if (msg != 0)
		speak(&mtext[msg]);
}

/* read, decrypt, and print a message (not ptext) */
/* msg is a pointer to seek address and length of mess */
void
speak(const struct text *msg)
{
	char *s, nonfirst;

	s = msg->seekadr;
	nonfirst = 0;
	while (s - msg->seekadr < msg->txtlen) { /* read a line at a time */
		tape = iotape;			 /* restart decryption tape */
		while ((*s++ ^ *tape++) != TAB); /* read past loc num */
		/* assume tape is longer than location number */
		/* plus the lookahead put together */
		if ((*s ^ *tape) == '>' &&
		    (*(s + 1) ^ *(tape + 1)) == '$' &&
		    (*(s + 2) ^ *(tape + 2)) == '<')
			break;
		if (blklin && !nonfirst++)
			putchar('\n');
		do {
			if (*tape == 0)
				tape = iotape;	/* rewind decryp tape */
			putchar(*s ^ *tape);
		} while ((*s++ ^ *tape++) != LF); /* better end with LF */
	}
}

/* read, decrypt and print a ptext message */
/* msg is the number of all the p msgs for this place */
/* assumes object 1 doesn't have prop 1, obj 2 no prop 2, etc. */
void
pspeak(int m, int skip)
{
	char *s, nonfirst;
	char *numst;
	struct text *msg;
	char *tbuf;

	msg = &ptext[m];
	if ((tbuf = malloc(msg->txtlen + 1)) == NULL)
		errx(1, "Out of memory!");
	memcpy(tbuf, msg->seekadr, (unsigned)msg->txtlen + 1); /* Room to null */
	s = tbuf;

	nonfirst = 0;
	while (s - tbuf < msg->txtlen) {	/* read line at a time */
		tape = iotape;			/* restart decryption tape */
		for (numst = s; (*s ^= *tape++) != TAB; s++) /* get number */
		  ; /* nothing */

				/* Temporarily trash the string (cringe) */
		*s++ = 0;	/* decrypting number within the string   */

		if (atoi(numst) != 100 * skip && skip >= 0) {
			while ((*s++ ^ *tape++) != LF)	/* flush the line */
				if (*tape == 0)
					tape = iotape;
			continue;
		}
		if ((*s ^ *tape) == '>' && (*(s + 1) ^ *(tape + 1)) == '$' &&
		    (*(s + 2) ^ *(tape + 2)) == '<')
			break;
		if (blklin && !nonfirst++)
			putchar('\n');
		do {
			if (*tape == 0)
				tape = iotape;
			putchar(*s ^ *tape);
		} while ((*s++ ^ *tape++) != LF);	/* better end with LF */
		if (skip < 0)
			break;
	}
	free(tbuf);
}