/*
 * Re-coding of advent in C: file i/o and user i/o
 */
#include "hdr.h"
#include <unistd.h>

int seekhere = 1;			/* initial seek for output file */

FILE *inbuf, *outbuf;

int adrptr;                             /* current seek adr ptr         */
int outsw = 0;				/* putting stuff to data file?  */

const char iotape[] = "Ax3F'tt$8hqer*hnGKrX:!l";
const char *tape = iotape;		/* pointer to encryption tape   */

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

char nbf[12];

int
next()                                  /* next char frm file, bump adr */
{       register char ch;
	adrptr++;                       /* seek address in file         */
	ch=getc(inbuf);
	if (outsw)                      /* putting data in tmp file     */
	{       if (*tape==0) tape=iotape; /* rewind encryption tape    */
		putc(ch ^ *tape++,outbuf); /* encrypt & output char     */
	}
	return(ch);
}

int
rnum()                                  /* read initial location num    */
{       register 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]=='-') return(-1);    /* end of data                  */
	return(atoi(nbf));              /* convert it to integer        */
}

void
rtrav()                                 /* read travel table            */
{       register int locc;
	register struct travlist *t = 0;
	register char *s;
	char buf[12];
	int len, m, n, entries = 0;
	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 = (struct travlist *) malloc(sizeof(*t));
		        travel[locc] = t;
		/*      printf("New travel list for %d\n",locc);        */
			entries=0;
			oldloc=locc;
		}
		for (s=buf; *s; 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->next = (struct travlist *) malloc(sizeof (*t));
                                t = t->next;
                        }
			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);       */
		}
	}
}

void
rdesc(sect)                             /* read description-format msgs */
int sect;
{
	register int locc;
	int seekstart, maystart;
	outsw=1;                        /* these msgs go into tmp file  */
	if (sect==1) putc('X',outbuf);  /* so seekadr > 0               */
	adrptr=0;
	for (oldloc= -1, seekstart=seekhere;;)
	{       maystart=adrptr;        /* maybe starting new entry     */
		if ((locc=rnum())!=oldloc && oldloc>=0  /* finished msg */
		    && ! (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                */
	}
}

void
getin(wrd1, wrd2)                       /* get command from user        */
char **wrd1, **wrd2;                    /* no prompt, usually           */
{       register 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        */
		if (feof(stdin)) {
			clearerr(stdin);
			continue;
		}
		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;
			}
		    default:
			if (++numch>=MAXSTR)    /* string too long      */
			{       printf("Give me a break!!\n");
				wd1buf[0]=wd2buf[0]=0;
				FLUSHLINE;
				return;
			}
			s++;
		}
	}
}

int
confirm(mesg)                           /* confirm irreversible action  */
char *mesg;
{       register int result;
	printf("%s",mesg);              /* tell him what he did         */
	if (getchar()=='y')             /* was his first letter a 'y'?  */
		result=1;
	else    result=0;
	FLUSHLINE;
	return(result);
}

int
yes(x, y, z)                            /* confirm with rspeak          */
int x, y, z;
{       register int result = -1;
	register char ch;
	for (;;)
	{       rspeak(x);                     /* tell him what we want*/
		if ((ch=getchar())=='y')
			result=TRUE;
		else if (ch=='n') result=FALSE;
		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);
}

int
yesm(x, y, z)                           /* confirm with mspeak          */
int x, y, z;
{       register int result = -1;
	register char ch;
	for (;;)
	{       mspeak(x);                     /* tell him what we want*/
		if ((ch=getchar())=='y')
			result=TRUE;
		else if (ch=='n') result=FALSE;
		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);
}

void
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();	*/
}

void
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;
	}
}

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

void
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;
		}
	}
}

void
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;
	}
}

void
rdata(infile, outfile)                  /* read all data from orig file */
char *infile, *outfile;                 /* datfile we were called with  */
{       register int sect;
	register char ch;
	inbuf = fopen(infile, "r");
	if (inbuf == NULL)              /* all the data lives in here   */
	{       printf("Cannot open data file %s\n", infile);
		exit(0);
	}
	outbuf = fopen(outfile, "w");
	if (outbuf == NULL)             /* the text lines will go here  */
	{       printf("Cannot create output file %s\n", outfile);
		exit(0);
	}
	clsses = 1;
	for (;;)                        /* read data sections           */
	{       sect=next()-'0';        /* 1st digit of section number  */
		//printf("Section %c",sect+'0');
		if ((ch=next())!=LF)    /* is there a second digit?     */
		{       FLUSHLF;
			//putchar(ch);
			sect=10*sect+ch-'0';
		}
		//putchar('\n');
		switch(sect)
		{   case 0:             /* finished reading database    */
			fclose(inbuf);
			fclose(outbuf);
			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;
	}
}

void
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);
	}
}

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

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

void
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;
	register char *tbuf;
	lseek(datfd, (off_t) msg->seekadr, 0);
	tbuf = (char *) alloca(msg->txtlen + 1);
	if (read(datfd,tbuf,msg->txtlen) != msg->txtlen) {
	        printf("Corrupted dat file!\n");
	        return;
	}
	s=tbuf;
	nonfirst=0;
	while (s-tbuf<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   */
	}
}

void
pspeak(msg, skip) /* read, decrypt an print a ptext message             */
int msg;          /* 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;
	register char *tbuf;
	char *numst;
	int lstr;
	lseek(datfd, (off_t) ptext[msg].seekadr, 0);
	lstr = ptext[msg].txtlen;
	tbuf = (char *) alloca(lstr + 1);
	if (read(datfd,tbuf,lstr) != lstr) {
	        printf("Corrupted dat file!\n");
	        return;
        }
	s=tbuf;
	nonfirst=0;
	while (s-tbuf<lstr)             /* read a line at a time        */
	{       tape=iotape;            /* restart decryption tape      */
		for (numst=s; (*s^= *tape++)!=TAB; s++); /* get number  */
		*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;
	}
}
