/*      $NetBSD: io.c,v 1.31 2024/03/26 20:50:29 andvar 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
 * ttgetch()            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)              send binary integer to output buffer
 * lwrite(buf,len)              write a buffer to the output buffer
 * lprcat(str)                  append a string to the 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 larn_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
 * standout(str)                print the string in standout mode
 * set_score_output()           called when output should be literally printed
 * ttputch(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)        routine to convert VT100 \33's to termcap format
 * beep()                       routine to emit a beep if enabled
 *                              (see no-beep in .larnopts)
 *
 * Note: ** entries are available only in termcap mode.
 */
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: io.c,v 1.31 2024/03/26 20:50:29 andvar Exp $");
#endif /* not lint */

#include "header.h"
#include "extern.h"
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <term.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.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 */
#include <stdarg.h>
#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 */

static int ttputch(int ch);
static void flush_buf(void);

#define LINBUFSIZE 128  /* size of the lgetw() and lgetl() buffer */
int             io_outfd; /* output file numbers */
int             io_infd; /* 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(void)
{
        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(void)
{
        resetscroll();
        clear();
        sncbr();                /* system("stty -cbreak echo"); */
}

/*
 *      ttgetch()       Routine to read in one character from the terminal
 */
int
ttgetch(void)
{
        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(void)
{
        gtty(0, &ttx);
        doraw(ttx);
        stty(0, &ttx);
}

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

/*
 *      newgame()       Subroutine to save the initial time and seed rnd()
 */
void
newgame(void)
{
        long  *p, *pe;
        for (p = c, pe = c + 100; p < pe; *p++ = 0);
        time(&initialtime);
        seedrand(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.
 */
void
lprintf(const char *fmt, ...)
{
        va_list ap;
        char buf[BUFBIG/2];

        va_start(ap, fmt);
        vsnprintf(buf, sizeof(buf), fmt, ap);
        va_end(ap);

        if (lpnt >= lpend)
                lflush();

        lprcat(buf);
}

/*
 *      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(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(char *buf, int len)
{
        char *s;
        u_char *t;
        int num2;

        if (len > 399) {        /* don't copy data if can just write it */
#ifdef EXTRA
                c[BYTESOUT] += len;
#endif

#ifndef VT100
                for (s = buf; len > 0; --len)
                        lprc(*s++);
#else   /* VT100 */
                lflush();
                write(io_outfd, buf, len);
#endif  /* VT100 */
        } 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;
                        t = lpnt;
                        len -= num2;
                        while (num2--)
                                *t++ = *buf++;  /* copy in the bytes */
                        lpnt = t;
                }
}

/*
 *      long lgetc()    Read one character from input buffer
 *
 *  Returns 0 if EOF, otherwise the character
 */
long
lgetc(void)
{
        int    i;
        if (ipoint != iepoint)
                return (inbuffer[ipoint++]);
        if (iepoint != MAXIBUF)
                return (0);
        if ((i = read(io_infd, 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
larn_lrint(void)
{
        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(char *adr, int num)
{
        u_char  *pnt;
        int    num2;

        while (num) {
                if (iepoint == ipoint) {
                        if (num > 5) {  /* fast way */
                                if (read(io_infd, 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(void)
{
        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(void)
{
        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(char *str)
{
        lflush();
        lpnt = lpbuf;
        lpend = lpbuf + BUFBIG;
        if (str == NULL)
                return (io_outfd = 1);
        if ((io_outfd = creat(str, 0644)) < 0) {
                io_outfd = 1;
                lprintf("error creating file <%s>: %s\n", str,
                        strerror(errno));
                lflush();
                return (-1);
        }
        return (io_outfd);
}

/*
 *      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(char *str)
{
        ipoint = iepoint = MAXIBUF;
        if (str == NULL)
                return (io_infd = 0);
        if ((io_infd = open(str, O_RDONLY)) < 0) {
                lwclose();
                io_outfd = 1;
                lpnt = lpbuf;
                return (-1);
        }
        return (io_infd);
}

/*
 *      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(char *str)
{
        lpnt = lpbuf;
        lpend = lpbuf + BUFBIG;
        if (str == NULL)
                return (io_outfd = 1);
        if ((io_outfd = open(str, 2)) < 0) {
                io_outfd = 1;
                return (-1);
        }
        lseek(io_outfd, 0, SEEK_END);   /* seek to end of file */
        return (io_outfd);
}

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

/*
 *      lwclose() close output file flushing if needed
 *
 *      Returns nothing of value.
 */
void
lwclose(void)
{
        lflush();
        if (io_outfd > 2) {
                close(io_outfd);
                io_outfd = 1;
        }
}

/*
 *      lprcat(string)  append a string to the output buffer
 *                              avoids calls to lprintf (time consuming)
 */
void
lprcat(const char *str)
{
        u_char  *str2;
        if (lpnt >= lpend)
                lflush();
        str2 = lpnt;
        while ((*str2++ = *str++) != '\0')
                continue;
        lpnt = str2 - 1;
}

#ifdef VT100
/*
 *      cursor(x,y)             Subroutine to set the cursor position
 *
 *      x and y are the cursor coordinates, and lpbuff is the output buffer where
 *      escape sequence will be placed.
 */
static char    *y_num[] = {
"\33[", "\33[", "\33[2", "\33[3", "\33[4", "\33[5", "\33[6",
"\33[7", "\33[8", "\33[9", "\33[10", "\33[11", "\33[12", "\33[13", "\33[14",
"\33[15", "\33[16", "\33[17", "\33[18", "\33[19", "\33[20", "\33[21", "\33[22",
"\33[23", "\33[24"};

static char    *x_num[] = {
"H", "H", ";2H", ";3H", ";4H", ";5H", ";6H", ";7H", ";8H", ";9H",
";10H", ";11H", ";12H", ";13H", ";14H", ";15H", ";16H", ";17H", ";18H", ";19H",
";20H", ";21H", ";22H", ";23H", ";24H", ";25H", ";26H", ";27H", ";28H", ";29H",
";30H", ";31H", ";32H", ";33H", ";34H", ";35H", ";36H", ";37H", ";38H", ";39H",
";40H", ";41H", ";42H", ";43H", ";44H", ";45H", ";46H", ";47H", ";48H", ";49H",
";50H", ";51H", ";52H", ";53H", ";54H", ";55H", ";56H", ";57H", ";58H", ";59H",
";60H", ";61H", ";62H", ";63H", ";64H", ";65H", ";66H", ";67H", ";68H", ";69H",
";70H", ";71H", ";72H", ";73H", ";74H", ";75H", ";76H", ";77H", ";78H", ";79H",
";80H"};

void
cursor(x, y)
        int             x, y;
{
        char  *p;
        if (lpnt >= lpend)
                lflush();

        p = y_num[y];           /* get the string to print */
        while (*p)
                *lpnt++ = *p++; /* print the string */

        p = x_num[x];           /* get the string to print */
        while (*p)
                *lpnt++ = *p++; /* print the string */
}
#else   /* VT100 */
/*
 * cursor(x,y)    Put cursor at specified coordinates staring at [1,1] (termcap)
 */
void
cursor(int x, int y)
{
        if (lpnt >= lpend)
                lflush();

        *lpnt++ = CURSOR;
        *lpnt++ = x;
        *lpnt++ = y;
}
#endif  /* VT100 */

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

#ifndef VT100
/*
 * 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    *outbuf = 0;     /* translated output buffer */
/*
 * init_term()          Terminal initialization -- setup termcap info
 */
void
init_term(void)
{
        setupterm(NULL, 0, NULL); /* will exit if invalid term */
        if (!cursor_address) {
                fprintf(stderr, "term does not have cursor_address.\n");
                exit(1);
        }
        if (!clr_eol) {
                fprintf(stderr, "term does not have clr_eol.\n");
                exit(1);
        }
        if (!clear_screen) {
                fprintf(stderr, "term does not have clear_screen.\n");
                exit(1);
        }
        if ((outbuf = malloc(BUFBIG + 16)) == 0) {      /* get memory for
                                                         * decoded output buffer */
            fprintf(stderr, "Error malloc'ing memory for decoded output buffer\n");
            died(-285);     /* malloc() failure */
        }

}
#endif  /* VT100 */

/*
 * cl_line(x,y)  Clear the whole line indicated by 'y' and leave cursor at [x,y]
 */
void
cl_line(int x, int y)
{
#ifdef VT100
        cursor(x, y);
        lprcat("\33[2K");
#else   /* VT100 */
        cursor(1, y);
        *lpnt++ = CL_LINE;
        cursor(x, y);
#endif  /* VT100 */
}

/*
 * cl_up(x,y) Clear screen from [x,1] to current position. Leave cursor at [x,y]
 */
void
cl_up(int x, int y)
{
#ifdef VT100
        cursor(x, y);
        lprcat("\33[1J\33[2K");
#else   /* VT100 */
        int    i;
        cursor(1, 1);
        for (i = 1; i <= y; i++) {
                *lpnt++ = CL_LINE;
                *lpnt++ = '\n';
        }
        cursor(x, y);
#endif  /* VT100 */
}

/*
 * cl_dn(x,y)   Clear screen from [1,y] to end of display. Leave cursor at [x,y]
 */
void
cl_dn(int x, int y)
{
#ifdef VT100
        cursor(x, y);
        lprcat("\33[J\33[2K");
#else   /* VT100 */
        int    i;
        cursor(1, y);
        if (!clr_eos) {
                *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);
#endif  /* VT100 */
}

/*
 * standout(str)        Print the argument string in inverse video (standout mode).
 */
void
standout(const char *str)
{
#ifdef VT100
        setbold();
        while (*str)
                *lpnt++ = *str++;
        resetbold();
#else   /* VT100 */
        *lpnt++ = ST_START;
        while (*str)
                *lpnt++ = *str++;
        *lpnt++ = ST_END;
#endif  /* VT100 */
}

/*
 * set_score_output()   Called when output should be literally printed.
 */
void
set_score_output(void)
{
        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'
 */
#ifndef VT100
static int      scrline = 18;   /* line # for wraparound instead of scrolling
                                 * if no DL */
void
lflush(void)
{
        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(io_outfd, 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) {
                                ttputch(*str);
                                curx++;
                        } else
                                switch (*str) {
                                case CLEAR:
                                        tputs(clear_screen, 0, ttputch);
                                        curx = cury = 0;
                                        break;

                                case CL_LINE:
                                        tputs(clr_eol, 0, ttputch);
                                        break;

                                case CL_DOWN:
                                        tputs(clr_eos, 0, ttputch);
                                        break;

                                case ST_START:
                                        tputs(enter_standout_mode, 0, ttputch);
                                        break;

                                case ST_END:
                                        tputs(exit_standout_mode, 0, ttputch);
                                        break;

                                case CURSOR:
                                        curx = *++str - 1;
                                        cury = *++str - 1;
                                        tputs(tiparm(cursor_address,
                                                    cury, curx), 0, ttputch);
                                        break;

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

                                                        if (++scrline > 23)
                                                                scrline = 19;
                                                        tputs(tiparm(
                                                            cursor_address,
                                                            scrline, 0),
                                                            0, ttputch);
                                                        tputs(clr_eol, 0,
                                                            ttputch);

                                                        if (--scrline < 19)
                                                                scrline = 23;
                                                        tputs(tiparm(
                                                            cursor_address,
                                                            scrline, 0),
                                                            0, ttputch);
                                                        tputs(clr_eol, 0,
                                                            ttputch);
                                                } else {
                                                        tputs(tiparm(
                                                            cursor_address,
                                                            19, 0),
                                                            0, ttputch);
                                                        tputs(delete_line, 0,
                                                            ttputch);
                                                        tputs(tiparm(
                                                            cursor_address,
                                                            23, 0),
                                                            0, ttputch);
                                                        /*
                                                         * tputs (AL, 0,
                                                         * ttputch);
                                                         */
                                                }
                                        } else {
                                                ttputch('\n');
                                                cury++;
                                        }
                                        curx = 0;
                                        break;

                                default:
                                        ttputch(*str);
                                        curx++;
                                };
                }
        }
        lpnt = lpbuf;
        flush_buf();            /* flush real output buffer now */
}
#else   /* VT100 */
/*
 *      lflush()                flush the output buffer
 *
 *      Returns nothing of value.
 */
void
lflush()
{
        int    lpoint;
        if ((lpoint = lpnt - lpbuf) > 0) {
#ifdef EXTRA
                c[BYTESOUT] += lpoint;
#endif
                if (write(io_outfd, lpbuf, lpoint) != lpoint)
                        write(2, "error writing to output file\n", 29);
        }
        lpnt = lpbuf;           /* point back to beginning of buffer */
}
#endif  /* VT100 */

#ifndef VT100
static int      vindex = 0;
/*
 * ttputch(ch)          Print one character in decoded output buffer.
 */
static int
ttputch(int ch)
{
        outbuf[vindex++] = ch;
        if (vindex >= BUFBIG)
                flush_buf();
        return (0);
}

/*
 * flush_buf()                  Flush buffer with decoded output.
 */
static void
flush_buf(void)
{
        if (vindex)
                write(io_outfd, 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(char *sd, char *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);
}
#endif  /* VT100 */

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