io.c

早期freebsd实现

		    && ! (sect==5 && (locc==0 || locc>=100)))/* unless sect 5*/
		{       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)
				{       printf("Too many random msgs\n");
					exit(0);
				}
				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)
				{       printf("Too many magic msgs\n");
					exit(0);
				}
				mtext[oldloc].seekadr=seekhere;
				mtext[oldloc].txtlen=maystart-seekstart;
				break;
			    default:
				printf("rdesc called with bad section\n");
				exit(0);
			}
			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                */
	}
}


rtrav()                                 /* read travel table            */
{       register int locc;
	register struct travlist *t;
	register char *s;
	char buf[12];
	int len,m,n,entries;
	for (oldloc= -1;;)              /* get another line             */
	{       if ((locc=rnum())!=oldloc && oldloc>=0) /* end of entry */
		{
			t->next = 0;    /* terminate the old entry      */
		/*      printf("%d:%d entries\n",oldloc,entries);       */
		/*      twrite(oldloc);                                 */
		}
		if (locc== -1) return;
		if (locc!=oldloc)        /* getting a new entry         */
		{       t=travel[locc]=(struct travlist *) malloc(sizeof (struct travlist));
		/*      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=length(buf)-1;      /* 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=(struct travlist *) malloc(sizeof (struct travlist));
			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

twrite(loq)                             /* travel options from this loc */
int loq;
{       register struct travlist *t;
	printf("If");
	speak(&ltext[loq]);
	printf("then\n");
	for (t=travel[loq]; t!=0; 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

rvoc()
{       register char *s;               /* read the vocabulary          */
	register int index;
	char buf[6];
	for (;;)
	{       index=rnum();
		if (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,index);*/
		vocab(buf,-2,index);
	}
/*	prht();	*/
}


rlocs()                                 /* initial object locations     */
{	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;
	}
}

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

rliq()                                  /* liquid assets &c: cond bits  */
{       register 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;
		}
	}
}

rhints()
{       register 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;
	}
}


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


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


speak(msg)       /* read, decrypt, and print a message (not ptext)      */
struct text *msg;/* msg is a pointer to seek address and length of mess */
{
	register 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   */
	}
}


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

	msg = &ptext[m];
	if ((tbuf=(char *) malloc(msg->txtlen + 1)) == 0) bug(108);
	memcpy(tbuf, msg->seekadr, 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  */

		save = *s; /* 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);
}