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Up to [local] / src / games / larn

Prune some obsolete defines, in particular VT100.  Eventually curses will
  replace termios.
Use system-defined limits for path lengths and usernames.
Use strlcpy() for convenience and to avoid a possible buffer overflow or two.
Various small tweaks.

/*	$OpenBSD: io.c,v 1.7 2000/06/29 07:55:41 pjanzen Exp $	*/
/*	$NetBSD: io.c,v 1.7 1997/10/18 20:03:26 christos Exp $	*/

/*
 * io.c			 Larn is copyrighted 1986 by Noah Morgan.
 * 
 * Below are the functions in this file:
 * 
 * setupvt100()		Subroutine to set up terminal in correct mode for game
 * clearvt100()		Subroutine to clean up terminal when the game is over
 * lgetchar()		Routine to read in one character from the terminal
 * scbr()		Function to set cbreak -echo for the terminal
 * sncbr()		Function to set -cbreak echo for the terminal
 * newgame()		Subroutine to save the initial time and seed rnd()
 * 
 * FILE OUTPUT ROUTINES
 * 
 * lprintf(format,args . . .)	printf to the output buffer
 * lprint(integer)		end binary integer to output buffer
 * lwrite(buf,len)		write a buffer to the output buffer
 * lprcat(str)			sent string to output buffer
 * 
 * FILE OUTPUT MACROS (in header.h)
 * 
 * lprc(character)		put the character into the output buffer
 * 
 * FILE INPUT ROUTINES
 * 
 * long lgetc()			read one character from input buffer
 * long lrint()			read one integer from input buffer
 * lrfill(address,number)	put input bytes into a buffer char
 * *lgetw()			get a whitespace ended word from
 * input char *lgetl()		get a \n or EOF ended line
 * from input
 * 
 * FILE OPEN / CLOSE ROUTINES
 * 
 * lcreat(filename)		create a new file for write
 * lopen(filename)		open a file for read
 * lappend(filename)		open for append to an existing file
 * lrclose()			close the input file
 * lwclose()			close output file
 * lflush()			flush the output buffer
 * 
 * Other Routines
 * 
 * cursor(x,y)			position cursor at [x,y]
 * cursors()			position cursor at [1,24] (saves memory)
 * cl_line(x,y)			Clear line at [1,y] and leave cursor at [x,y]
 * cl_up(x,y)			Clear screen from [x,1] to current line
 * cl_dn(x,y)			clear screen from [1,y] to end of display
 * lstandout(str)		print the string in standout mode
 * set_score_output()		called when output should be literally printed
 * xputchar(ch)			print one character in decoded output buffer
 * flush_buf()			flush buffer with decoded output
 * init_term()			terminal initialization -- setup termcap info
 * char *tmcapcnv(sd,ss)	iroutine to convert VT100 \33's to termcap format
 * lbeep()	Routine to emit a beep if enabled (see no-beep in .larnopts)
 * 
 * Note: ** entries are available only in termcap mode.
 */

#ifndef lint
static char rcsid[] = "$OpenBSD: io.c,v 1.7 2000/06/29 07:55:41 pjanzen Exp $";
#endif /* not lint */

#include "header.h"
#include "extern.h"
#include <ctype.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <term.h>
#include <fcntl.h>
#include <errno.h>

#ifdef TERMIO
#include <termio.h>
#define sgttyb termio
#define stty(_a,_b) ioctl(_a,TCSETA,_b)
#define gtty(_a,_b) ioctl(_a,TCGETA,_b)
#endif
#ifdef TERMIOS
#include <termios.h>
#define sgttyb termios
#define stty(_a,_b) tcsetattr(_a,TCSADRAIN,_b)
#define gtty(_a,_b) tcgetattr(_a,_b)
#endif

#if defined(TERMIO) || defined(TERMIOS)
static int	rawflg = 0;
static char	saveeof, saveeol;
#define doraw(_a) \
	if(!rawflg) { \
		++rawflg; \
		saveeof = _a.c_cc[VMIN]; \
		saveeol = _a.c_cc[VTIME]; \
	} \
	_a.c_cc[VMIN] = 1; \
	_a.c_cc[VTIME] = 1; \
	_a.c_lflag &= ~(ICANON|ECHO|ECHOE|ECHOK|ECHONL)
#define unraw(_a) \
	_a.c_cc[VMIN] = saveeof; \
	_a.c_cc[VTIME] = saveeol; \
	_a.c_lflag |= ICANON|ECHO|ECHOE|ECHOK|ECHONL

#else	/* not TERMIO or TERMIOS */

#ifndef BSD
#define CBREAK RAW		/* V7 has no CBREAK */
#endif

#define doraw(_a) (_a.sg_flags |= CBREAK,_a.sg_flags &= ~ECHO)
#define unraw(_a) (_a.sg_flags &= ~CBREAK,_a.sg_flags |= ECHO)
#include <sgtty.h>
#endif	/* not TERMIO or TERMIOS */

#ifndef NOVARARGS	/* if we have varargs */
#ifdef __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#else	/* NOVARARGS */	/* if we don't have varargs */
typedef char	*va_list;
#define va_dcl int va_alist;
#define va_start(plist) plist = (char *) &va_alist
#define va_end(plist)
#define va_arg(plist,mode) ((mode *)(plist += sizeof(mode)))[-1]
#endif	/* NOVARARGS */

#define LINBUFSIZE 128	/* size of the lgetw() and lgetl() buffer */
int	lfd;	/* output file numbers */
int	fd;	/* input file numbers */
static struct sgttyb ttx;/* storage for the tty modes */
static int	ipoint = MAXIBUF, iepoint = MAXIBUF;	/* input buffering
							 * pointers    */
static char	lgetwbuf[LINBUFSIZE];	/* get line (word) buffer */

/*
 *	setupvt100() Subroutine to set up terminal in correct mode for game
 *
 *	Attributes off, clear screen, set scrolling region, set tty mode
 */
void
setupvt100()
{
	clear();
	setscroll();
	scbr();			/* system("stty cbreak -echo"); */
}

/*
 *	clearvt100()	Subroutine to clean up terminal when the game is over
 *
 *	Attributes off, clear screen, unset scrolling region, restore tty mode
 */
void
clearvt100()
{
	resetscroll();
	clear();
	sncbr();		/* system("stty -cbreak echo"); */
}

/*
 *	lgetchar()	Routine to read in one character from the terminal
 */
int
lgetchar()
{
	char	byt;
#ifdef EXTRA
	c[BYTESIN]++;
#endif
	lflush();		/* be sure output buffer is flushed */
	read(0, &byt, 1);	/* get byte from terminal */
	return (byt);
}

/*
 *	scbr()		Function to set cbreak -echo for the terminal
 *
 *	like: system("stty cbreak -echo")
 */
void
scbr()
{
	gtty(0, &ttx);
	doraw(ttx);
	stty(0, &ttx);
}

/*
 *	sncbr()		Function to set -cbreak echo for the terminal
 *
 *	like: system("stty -cbreak echo")
 */
void
sncbr()
{
	gtty(0, &ttx);
	unraw(ttx);
	stty(0, &ttx);
}

/*
 *	newgame()	Subroutine to save the initial time and seed rnd()
 */
void
newgame()
{
	long	*p, *pe;

	for (p = c, pe = c + 100; p < pe; *p++ = 0);
	time(&initialtime);
	srandom(initialtime);
	lcreat((char *) 0);	/* open buffering for output to terminal */
}

/*
 *	lprintf(format,args . . .)		printf to the output buffer
 *		char *format;
 *		??? args . . .
 *
 *	Enter with the format string in "format", as per printf() usage
 *		and any needed arguments following it
 *	Note: lprintf() only supports %s, %c and %d, with width modifier and left
 *		or right justification.
 *	No correct checking for output buffer overflow is done, but flushes
 *		are done beforehand if needed.
 *	Returns nothing of value.
 */
#ifdef lint
/* VARARGS */
lprintf(str)
	char	*str;
{
	char	*str2;
	str2 = str;
	str = str2;		/* to make lint happy */
}
/* VARARGS */
sprintf(str)
	char	*str;
{
	char	*str2;
	str2 = str;
	str = str2;		/* to make lint happy */
}
#else	/* lint */
/* VARARGS */
#ifdef __STDC__
void lprintf(const char *fmt, ...)
#else
void
lprintf(va_alist)
va_dcl
#endif
{
	va_list	ap;	/* pointer for variable argument list */
	char	*outb, *tmpb;
	long	wide, left, cont, n;	/* data for lprintf	 */
	char	db[12];	/* %d buffer in lprintf	 */
#ifndef __STDC__
	char	*fmt;

	va_start(ap);		/* initialize the var args pointer */
	fmt = va_arg(ap, char *);	/* pointer to format string */
#else
	va_start(ap, fmt);
#endif
	if (lpnt >= lpend)
		lflush();
	outb = lpnt;
	for (;;) {
		while (*fmt != '%')
			if (*fmt)
				*outb++ = *fmt++;
			else {
				lpnt = outb;
				return;
			}
		wide = 0;
		left = 1;
		cont = 1;
		while (cont)
			switch (*(++fmt)) {
			case 'd':
				n = va_arg(ap, long);
				if (n < 0) {
					n = -n;
					*outb++ = '-';
					if (wide)
						--wide;
				}
				tmpb = db + 11;
				*tmpb = (char) (n % 10 + '0');
				while (n > 9)
					*(--tmpb) = (char) ((n /= 10) % 10 + '0');
				if (wide == 0)
					while (tmpb < db + 12)
						*outb++ = *tmpb++;
				else {
					wide -= db - tmpb + 12;
					if (left)
						while (wide-- > 0)
							*outb++ = ' ';
					while (tmpb < db + 12)
						*outb++ = *tmpb++;
					if (left == 0)
						while (wide-- > 0)
							*outb++ = ' ';
				}
				cont = 0;
				break;

			case 's':
				tmpb = va_arg(ap, char *);
				if (wide == 0) {
					while ((*outb++ = *tmpb++) != '\0')
						continue;
					--outb;
				} else {
					n = wide - strlen(tmpb);
					if (left)
						while (n-- > 0)
							*outb++ = ' ';
					while ((*outb++ = *tmpb++) != '\0')
						continue;
					--outb;
					if (left == 0)
						while (n-- > 0)
							*outb++ = ' ';
				}
				cont = 0;
				break;

			case 'c':
				*outb++ = va_arg(ap, int);
				cont = 0;
				break;

			case '0':
			case '1':
			case '2':
			case '3':
			case '4':
			case '5':
			case '6':
			case '7':
			case '8':
			case '9':
				wide = 10 * wide + *fmt - '0';
				break;

			case '-':
				left = 0;
				break;

			default:
				*outb++ = *fmt;
				cont = 0;
				break;
			};
		fmt++;
	}
	va_end(ap);
}
#endif	/* lint */

/*
 *	lprint(long-integer)	send binary integer to output buffer
 *		long integer;
 *
 *		+---------+---------+---------+---------+
 *		|   high  |	    |	      |	  low	|
 *		|  order  |	    |	      |  order	|
 *		|   byte  |	    |	      |	  byte	|
 *		+---------+---------+---------+---------+
 *	        31  ---  24 23 --- 16 15 ---  8 7  ---   0
 *
 *	The save order is low order first, to high order (4 bytes total)
 *	and is written to be system independent.
 *	No checking for output buffer overflow is done, but flushes if needed!
 *	Returns nothing of value.
 */
void
lprint(x)
	long	x;
{
	if (lpnt >= lpend)
		lflush();
	*lpnt++ = 255 & x;
	*lpnt++ = 255 & (x >> 8);
	*lpnt++ = 255 & (x >> 16);
	*lpnt++ = 255 & (x >> 24);
}

/*
 *	lwrite(buf,len)		write a buffer to the output buffer
 *		char *buf;
 *		int len;
 *
 *	Enter with the address and number of bytes to write out
 *	Returns nothing of value
 */
void
lwrite(buf, len)
	char	*buf;
	int	len;
{
	char	*str;
	int	num2;
	if (len > 399) {	/* don't copy data if can just write it */
#ifdef EXTRA
		c[BYTESOUT] += len;
#endif

		for (str = buf; len > 0; --len)
			lprc(*str++);
	} else
		while (len) {
			if (lpnt >= lpend)
				lflush();	/* if buffer is full flush it	 */
			num2 = lpbuf + BUFBIG - lpnt;	/* # bytes left in
							 * output buffer	 */
			if (num2 > len)
				num2 = len;
			str = lpnt;
			len -= num2;
			while (num2--)
				*str++ = *buf++;	/* copy in the bytes */
			lpnt = str;
		}
}

/*
 *	long lgetc()	Read one character from input buffer
 *
 *	Returns 0 if EOF, otherwise the character
 */
long 
lgetc()
{
	int	i;

	if (ipoint != iepoint)
		return (inbuffer[ipoint++]);
	if (iepoint != MAXIBUF)
		return (0);
	if ((i = read(fd, inbuffer, MAXIBUF)) <= 0) {
		if (i != 0)
			write(1, "error reading from input file\n", 30);
		iepoint = ipoint = 0;
		return (0);
	}
	ipoint = 1;
	iepoint = i;
	return (*inbuffer);
}

/*
 *	long lrint()	Read one integer from input buffer
 *
 *		+---------+---------+---------+---------+
 *		|   high  |	    |	      |	  low	|
 *		|  order  |	    |	      |  order	|
 *		|   byte  |	    |	      |	  byte	|
 *		+---------+---------+---------+---------+
 *	       31  ---  24 23 --- 16 15 ---  8 7  ---   0
 *
 *	The save order is low order first, to high order (4 bytes total)
 *	Returns the int read
 */
long 
lrint()
{
	unsigned long i;

	i = 255 & lgetc();
	i |= (255 & lgetc()) << 8;
	i |= (255 & lgetc()) << 16;
	i |= (255 & lgetc()) << 24;
	return (i);
}

/*
 *	lrfill(address,number)		put input bytes into a buffer
 *		char *address;
 *		int number;
 *
 *	Reads "number" bytes into the buffer pointed to by "address".
 *	Returns nothing of value
 */
void
lrfill(adr, num)
	char	*adr;
	int	num;
{
	char	*pnt;
	int	num2;

	while (num) {
		if (iepoint == ipoint) {
			if (num > 5) {	/* fast way */
				if (read(fd, adr, num) != num)
					write(2, "error reading from input file\n", 30);
				num = 0;
			} else {
				*adr++ = lgetc();
				--num;
			}
		} else {
			num2 = iepoint - ipoint;	/* # of bytes left in
							 * the buffer	 */
			if (num2 > num)
				num2 = num;
			pnt = inbuffer + ipoint;
			num -= num2;
			ipoint += num2;
			while (num2--)
				*adr++ = *pnt++;
		}
	}
}

/*
 *	char *lgetw()			Get a whitespace ended word from input
 *
 *	Returns pointer to a buffer that contains word.  If EOF, returns a NULL
 */
char *
lgetw()
{
	char	*lgp, cc;
	int	n = LINBUFSIZE, quote = 0;

	lgp = lgetwbuf;
	do
		cc = lgetc();
	while ((cc <= 32) && (cc > '\0'));	/* eat whitespace */
	for (;; --n, cc = lgetc()) {
		if ((cc == '\0') && (lgp == lgetwbuf))
			return (NULL);	/* EOF */
		if ((n <= 1) || ((cc <= 32) && (quote == 0))) {
			*lgp = '\0';
			return (lgetwbuf);
		}
		if (cc != '"')
			*lgp++ = cc;
		else
			quote ^= 1;
	}
}

/*
 *	char *lgetl()	Function to read in a line ended by newline or EOF
 *
 * Returns pointer to a buffer that contains the line.  If EOF, returns NULL
 */
char *
lgetl()
{
	int	i = LINBUFSIZE, ch;
	char	*str = lgetwbuf;

	for (;; --i) {
		if ((*str++ = ch = lgetc()) == '\0') {
			if (str == lgetwbuf + 1)
				return (NULL);	/* EOF */
	ot:		*str = '\0';
			return (lgetwbuf);	/* line ended by EOF */
		}
		if ((ch == '\n') || (i <= 1))
			goto ot;/* line ended by \n */
	}
}

/*
 *	lcreat(filename)			Create a new file for write
 *		char *filename;
 *
 *	lcreat((char*)0); means to the terminal
 *	Returns -1 if error, otherwise the file descriptor opened.
 */
int
lcreat(str)
	char *str;
{
	lpnt = lpbuf;
	lpend = lpbuf + BUFBIG;
	if (str == NULL)
		return (lfd = 1);
	if ((lfd = creat(str, 0644)) < 0) {
		lfd = 1;
		lprintf("error creating file <%s>: %s\n", str,
			strerror(errno));
		lflush();
		return (-1);
	}
	return (lfd);
}

/*
 *	lopen(filename)			Open a file for read
 *		char *filename;
 *
 *	lopen(0) means from the terminal
 *	Returns -1 if error, otherwise the file descriptor opened.
 */
int
lopen(str)
	char	*str;
{
	ipoint = iepoint = MAXIBUF;
	if (str == NULL)
		return (fd = 0);
	if ((fd = open(str, O_RDONLY, 0)) < 0) {
		lwclose();
		lfd = 1;
		lpnt = lpbuf;
		return (-1);
	}
	return (fd);
}

/*
 *	lappend(filename)		Open for append to an existing file
 *		char *filename;
 *
 *	lappend(0) means to the terminal
 *	Returns -1 if error, otherwise the file descriptor opened.
 */
int
lappend(str)
	char	*str;
{
	lpnt = lpbuf;
	lpend = lpbuf + BUFBIG;
	if (str == NULL)
		return (lfd = 1);
	if ((lfd = open(str, O_RDWR, 0)) < 0) {
		lfd = 1;
		return (-1);
	}
	lseek(lfd, 0, SEEK_END);
	return (lfd);
}

/*
 *	lrclose() close the input file
 *
 *	Returns nothing of value.
 */
void
lrclose()
{
	if (fd > 0)
		close(fd);
}

/*
 *	lwclose() close output file flushing if needed
 *
 *	Returns nothing of value.
 */
void
lwclose()
{
	lflush();
	if (lfd > 2)
		close(lfd);
}

/*
 *	lprcat(string)	append a string to the output buffer
 *			avoids calls to lprintf (time consuming)
 */
void
lprcat(str)
	char	*str;
{
	char	*str2;

	if (lpnt >= lpend)
		lflush();
	str2 = lpnt;
	while ((*str2++ = *str++) != '\0')
		continue;
	lpnt = str2 - 1;
}

/*
 * cursor(x,y)	  Put cursor at specified coordinates staring at [1,1] (termcap)
 */
void
cursor(x, y)
	int	x, y;
{
	if (lpnt >= lpend)
		lflush();

	*lpnt++ = CURSOR;
	*lpnt++ = x;
	*lpnt++ = y;
}

/*
 *	Routine to position cursor at beginning of 24th line
 */
void
cursors()
{
	cursor(1, 24);
}

/*
 * Warning: ringing the bell is control code 7. Don't use in defines.
 * Don't change the order of these defines.
 * Also used in helpfiles. Codes used in helpfiles should be \E[1 to \E[7 with
 * obvious meanings.
 */

static char	cap[256];
char		*CM, *CE, *CD, *CL, *SO, *SE, *AL, *DL;	/* Termcap capabilities */
static char	*outbuf = 0;	/* translated output buffer */

/*
 * init_term()		Terminal initialization -- setup termcap info
 */
void
init_term()
{
	char	termbuf[1024];
	char	*capptr = cap + 10;
	char	*term;
	int	co, li;

	switch (tgetent(termbuf, term = getenv("TERM"))) {
	case -1:
		write(2, "Cannot open termcap file.\n", 26);
		exit(1);
	case 0:
		write(2, "Cannot find entry of ", 21);
		write(2, term, strlen(term));
		write(2, " in termcap\n", 12);
		exit(1);
	};

	CM = tgetstr("cm", &capptr);	/* Cursor motion */
	CE = tgetstr("ce", &capptr);	/* Clear to eoln */
	CL = tgetstr("cl", &capptr);	/* Clear screen */

	/* OPTIONAL */
	AL = tgetstr("al", &capptr);	/* Insert line */
	DL = tgetstr("dl", &capptr);	/* Delete line */
	SO = tgetstr("so", &capptr);	/* Begin standout mode */
	SE = tgetstr("se", &capptr);	/* End standout mode */
	CD = tgetstr("cd", &capptr);	/* Clear to end of display */
	co = tgetnum("co");	/* columns */
	li = tgetnum("li");	/* lines */

	if (!CM) {		/* can't find cursor motion entry */
		write(2, "Sorry, for a ", 13);
		write(2, term, strlen(term));
		write(2, ", I can't find the cursor motion entry in termcap\n", 50);
		exit(1);
	}
	if (!CE) {		/* can't find clear to end of line entry */
		write(2, "Sorry, for a ", 13);
		write(2, term, strlen(term));
		write(2, ", I can't find the clear to end of line entry in termcap\n", 57);
		exit(1);
	}
	if (!CL) {		/* can't find clear entire screen entry */
		write(2, "Sorry, for a ", 13);
		write(2, term, strlen(term));
		write(2, ", I can't find the clear entire screen entry in termcap\n", 56);
		exit(1);
	}
	if (co < 80 || li < 25) {
		write(2, "Sorry, screen too small (80x25 min)\n", 36);
		exit(1);
	}
	if ((outbuf = malloc(BUFBIG + 16)) == 0) {	/* get memory for
							 * decoded output buffer */
		write(2, "Error malloc'ing memory for decoded output buffer\n", 50);
		died(-285);	/* malloc() failure */
	}
}

/*
 * cl_line(x,y)  Clear the whole line indicated by 'y' and leave cursor at [x,y]
 */
void
cl_line(x, y)
	int	x, y;
{
	cursor(1, y);
	*lpnt++ = CL_LINE;
	cursor(x, y);
}

/*
 * cl_up(x,y) Clear screen from [x,1] to current position. Leave cursor at [x,y]
 */
void
cl_up(x, y)
	int	x, y;
{
	int	i;
	cursor(1, 1);
	for (i = 1; i <= y; i++) {
		*lpnt++ = CL_LINE;
		*lpnt++ = '\n';
	}
	cursor(x, y);
}

/*
 * cl_dn(x,y)	Clear screen from [1,y] to end of display. Leave cursor at [x,y]
 */
void
cl_dn(x, y)
	int	x, y;
{
	int	i;
	cursor(1, y);
	if (!CD) {
		*lpnt++ = CL_LINE;
		for (i = y; i <= 24; i++) {
			*lpnt++ = CL_LINE;
			if (i != 24)
				*lpnt++ = '\n';
		}
		cursor(x, y);
	} else
		*lpnt++ = CL_DOWN;
	cursor(x, y);
}

/*
 * lstandout(str)	Print the argument string in inverse video (standout mode).
 */
void
lstandout(str)
	char	*str;
{
	*lpnt++ = ST_START;
	while (*str)
		*lpnt++ = *str++;
	*lpnt++ = ST_END;
}

/*
 * set_score_output()	Called when output should be literally printed.
 */
void
set_score_output()
{
	enable_scroll = -1;
}

/*
 *	lflush()	Flush the output buffer
 *
 *	Returns nothing of value.
 *	for termcap version: Flush output in output buffer according to output
 *	status as indicated by `enable_scroll'
 */
static int	scrline = 18;	/* line # for wraparound instead of scrolling
				 * if no DL */
void
lflush()
{
	int	lpoint;
	u_char	*str;
	static int	curx = 0;
	static int	cury = 0;

	if ((lpoint = lpnt - lpbuf) > 0) {
#ifdef EXTRA
		c[BYTESOUT] += lpoint;
#endif
		if (enable_scroll <= -1) {
			flush_buf();
			if (write(lfd, lpbuf, lpoint) != lpoint)
				write(2, "error writing to output file\n", 29);
			lpnt = lpbuf;	/* point back to beginning of buffer */
			return;
		}
		for (str = lpbuf; str < lpnt; str++) {
			if (*str >= 32) {
				xputchar(*str);
				curx++;
			} else
				switch (*str) {
				case CLEAR:
					tputs(CL, 0, xputchar);
					curx = cury = 0;
					break;

				case CL_LINE:
					tputs(CE, 0, xputchar);
					break;

				case CL_DOWN:
					tputs(CD, 0, xputchar);
					break;

				case ST_START:
					tputs(SO, 0, xputchar);
					break;

				case ST_END:
					tputs(SE, 0, xputchar);
					break;

				case CURSOR:
					curx = *++str - 1;
					cury = *++str - 1;
					tputs(tgoto(CM, curx, cury), 0, xputchar);
					break;

				case '\n':
					if ((cury == 23) && enable_scroll) {
						if (!DL || !AL) {	/* wraparound or scroll? */
							if (++scrline > 23)
								scrline = 19;

							if (++scrline > 23)
								scrline = 19;
							tputs(tgoto(CM, 0, scrline), 0, xputchar);
							tputs(CE, 0, xputchar);

							if (--scrline < 19)
								scrline = 23;
							tputs(tgoto(CM, 0, scrline), 0, xputchar);
							tputs(CE, 0, xputchar);
						} else {
							tputs(tgoto(CM, 0, 19), 0, xputchar);
							tputs(DL, 0, xputchar);
							tputs(tgoto(CM, 0, 23), 0, xputchar);
							/*
							 * tputs (AL, 0,
							 * xputchar);
							 */
						}
					} else {
						xputchar('\n');
						cury++;
					}
					curx = 0;
					break;

				default:
					xputchar(*str);
					curx++;
				};
		}
	}
	lpnt = lpbuf;
	flush_buf();		/* flush real output buffer now */
}

static int	vindex = 0;
/*
 * xputchar(ch)		Print one character in decoded output buffer.
 */
int 
xputchar(c)
	int	c;
{
	outbuf[vindex++] = c;
	if (vindex >= BUFBIG)
		flush_buf();
	return 0;
}

/*
 * flush_buf()			Flush buffer with decoded output.
 */
void
flush_buf()
{
	if (vindex)
		write(lfd, outbuf, vindex);
	vindex = 0;
}

/*
 *	char *tmcapcnv(sd,ss)  Routine to convert VT100 escapes to termcap
 *	format
 *	Processes only the \33[#m sequence (converts . files for termcap use
 */
char *
tmcapcnv(sd, ss)
	char	*sd, *ss;
{
	int	tmstate = 0;	/* 0=normal, 1=\33 2=[ 3=# */
	char	tmdigit = 0;	/* the # in \33[#m */

	while (*ss) {
		switch (tmstate) {
		case 0:
			if (*ss == '\33') {
				tmstate++;
				break;
			}
	ign:		*sd++ = *ss;
	ign2:		tmstate = 0;
			break;
		case 1:
			if (*ss != '[')
				goto ign;
			tmstate++;
			break;
		case 2:
			if (isdigit((u_char)*ss)) {
				tmdigit = *ss - '0';
				tmstate++;
				break;
			}
			if (*ss == 'm') {
				*sd++ = ST_END;
				goto ign2;
			}
			goto ign;
		case 3:
			if (*ss == 'm') {
				if (tmdigit)
					*sd++ = ST_START;
				else
					*sd++ = ST_END;
				goto ign2;
			}
		default:
			goto ign;
		};
		ss++;
	}
	*sd = 0;		/* NULL terminator */
	return (sd);
}

/*
 *	lbeep()	Routine to emit a beep if enabled (see no-beep in .larnopts)
 */
void
lbeep()
{
	if (!nobeep)
		*lpnt++ = '\7';
}