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/*
 *
 * Conditionally compiled routines for setting up and reading the line. Things
 * were getting out of hand with all the ifdefs, and even though this defeats
 * part of the purpose of conditional complilation directives, I think it's easier
 * to follow this way. Thanks to Alan Buckwalter for the System V DKHOST code.
 *
 * postio now can be run as separate read and write processes, but requires that
 * you write a procedure called resetline() and perhaps modify readline() some.
 * I've already tested the code on System V and it seems to work. Ninth Edition
 * and BSD code may be missing.
 *
 * By request I've changed the way some of the setupline() procedures (eg. in the
 * System V implementation) handle things when no line has been given. If line is
 * NULL the new setupline() procedures try to continue, assuming whoever called
 * postio connected stdout to the printer. Things will only work if we can read
 * and write stdout!
 *
 */

#include <stdio.h>
#include <ctype.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/types.h>
#include <errno.h>

#include "ifdef.h"                      /* conditional header file inclusion */
#include "gen.h"                        /* general purpose definitions */

FILE    *fp_ttyi, *fp_ttyo;
char    *ptr = mesg;

extern int      window_size;

/*****************************************************************************/

#ifdef SYSV
setupline()

{

    struct termio       termio;

/*
 *
 * Line initialization for SYSV. For now if no line is given (ie. line == NULL )
 * we continue on as before using stdout as ttyi and ttyo. Doesn't work when we're
 * running in interactive mode or forcing stuff that comes back from the printer
 * to stdout. Both cases are now caught by a test that's been added to routine
 * initialize(). The change is primarily for the version of lp that's available
 * with SVR3.2.
 *
 */

#ifdef DKHOST
    if ( line != NULL && *line != '/' )  {
        if ( strncmp(line, "DK:", 3) == 0 )
            line += 3;
        dkhost_connect();
#ifdef DKSTREAMS
        if ( ioctl(ttyi, I_PUSH, DKSTREAMS) == -1 )
            error(FATAL, "ioctl error - %s", DKSTREAMS);
        if ( ioctl(ttyi, I_PUSH, "ldterm") == -1 )
            error(FATAL, "ioctl error - ldterm");
#endif
    } else
#endif

    if ( line == NULL )
        ttyi = fileno(stdout);
    else if ( (ttyi = open(line, O_RDWR)) == -1 )
        error(FATAL, "can't open %s", line);

    if ( (ttyo = dup(ttyi)) == -1 )
        error(FATAL, "can't dup file descriptor for %s", line);

    if ( stopbits == 1 )
        stopbits = 0;
    else stopbits = CSTOPB;

    if ( fcntl(ttyi, F_SETFL, O_NDELAY) == -1 )
        error(FATAL, "fcntl error - F_SETFL");

    if ( ioctl(ttyi, TCGETA, &termio) == -1 )
        error(FATAL, "ioctl error - TCGETA");

    termio.c_iflag = IXON | IGNCR;
    termio.c_oflag = 0;
    termio.c_cflag = HUPCL | CREAD | CS8 | stopbits | baudrate;
    termio.c_lflag = 0;
    termio.c_cc[VMIN] = termio.c_cc[VTIME] = 0;

    if ( ioctl(ttyi, TCSETA, &termio) == -1 )
        error(FATAL, "ioctl error - TCSETA");

    if ( ioctl(ttyi, TCFLSH, 2) == -1 )
        error(FATAL, "ioctl error - TCFLSH");

    fp_ttyi = fdopen(ttyi, "r");

}   /* End of setupline */

/*****************************************************************************/

resetline()

{

    int                 flags;          /* for turning O_NDELAY off */
    struct termio       termio;         /* so we can reset flow control */

/*
 *
 * Only used if we're running the program as separate read and write processes.
 * Called from split() after the initial connection has been made and returns
 * TRUE if two processes should work. Don't know if the O_NDELAY stuff is really
 * needed, but setting c_cc[VMIN] to 1 definitely is. If we leave it be (as a 0)
 * the read in readline() won't block!
 *
 */

    if ( (flags = fcntl(ttyi, F_GETFL, 0)) == -1 )
        error(FATAL, "fcntl error - F_GETFL");

    flags &= ~O_NDELAY;

    if ( fcntl(ttyi, F_SETFL, flags) == -1 )
        error(FATAL, "fcntl error - F_SETFL");

    if ( ioctl(ttyi, TCGETA, &termio) == -1 )
        error(FATAL, "ioctl error - TCGETA");

    termio.c_iflag &= ~IXANY;
    termio.c_iflag |= IXON | IXOFF;
    termio.c_cc[VMIN] = 1;
    termio.c_cc[VTIME] = 0;

    if ( ioctl(ttyi, TCSETA, &termio) == -1 )
        error(FATAL, "ioctl error - TCSETA");

    return(TRUE);

}   /* End of resetline */

/*****************************************************************************/

setupstdin(mode)

    int         mode;                   /* what to do with stdin settings */

{

    struct termio               termio;

    static int                  saved = FALSE;
    static struct termio        oldtermio;

/*
 *
 * Save (mode = 0), reset (mode = 1), or restore (mode = 2) the tty settings for
 * stdin. Expect something like raw mode with no echo will be set up. Explicit
 * code to ensure blocking reads probably isn't needed because blocksize is set
 * to 1 when we're in interactive mode, but I've included it anyway.
 *
 */

    if ( interactive == TRUE )
        switch ( mode )  {
            case 0:
                if ( isatty(0) != 1 )
                    error(FATAL, "stdin not a terminal - can't run interactive mode");
                if ( ioctl(0, TCGETA, &oldtermio) == -1 )
                    error(FATAL, "can't save terminal settings");
                saved = TRUE;
                break;

            case 1:
                termio = oldtermio;
                termio.c_lflag &= ~(ICANON | ECHO | ECHOE | ECHOK | ECHONL);
                termio.c_cc[VMIN] = 1;
                termio.c_cc[VTIME] = 0;
                ioctl(0, TCSETA, &termio);
                break;

            case 2:
                if ( saved == TRUE )
                    ioctl(0, TCSETA, &oldtermio);
                break;
        }   /* End switch */

}   /* End of setupstdin */

/*****************************************************************************/

readline()

{

    int         n;                      /* read() return value */
    int         ch;                     /* for interactive mode */

    static int  tries = 0;              /* consecutive times read returned 0 */

/*
 *
 * Reads characters coming back from the printer on ttyi up to a newline (or EOF)
 * or until no more characters are available. Characters are put in mesg[], the
 * string is terminated with '\0' when we're done with a line and TRUE is returned
 * to the caller. If complete line wasn't available FALSE is returned. Interactive
 * mode should loop here forever, except during start(), echoing characters to
 * stdout. If it happens to leave FALSE should be returned. The non-blocking read
 * gets us out until split() is called.
 *
 * Some users (apparently just on 3B2 DKHOST systems) have had problems with the
 * two process implementation that's forced me to kludge things up some. When a
 * printer (on those systems) is turned off while postio is transmitting files
 * the write process hangs in writeblock() (postio.c) - it's typically in the
 * middle of a write() call, while the read() call (below) continually returns 0.
 * In the original code readline() returned FALSE when read() returned 0 and we
 * get into a loop that never ends - because the write process is hung. In the
 * one process implementation having read return 0 is legitimate because the line
 * is opened for no delay, but with two processes the read() blocks and a return
 * value of 0 should never occur. From my point of view the real problem is that
 * the write() call hangs on 3B2 DKHOST systems and apparently doesn't anywhere
 * else. If the write returned anything less than or equal to 0 writeblock() would
 * shut things down. The kludge I've implemented counts the number of consecutive
 * times read() returns a 0 and if it exceeds a limit (100) the read process will
 * shut things down. In fact one return of 0 from read() when we're in the two
 * process mode is undoubtedly sufficient and no counting should be necessary!!!
 * Moving the check to getstatus() should also work and is probably where things
 * belong.
 *
 */

    if ( interactive == FALSE )  {
        while ( (n = read(ttyi, ptr, 1)) != 0 )  {
            if ( n < 0 )
                if ( errno == EINTR )
                    continue;
                else error(FATAL, "error reading %s", line);
            tries = 0;
            if ( *ptr == '\n' || *ptr == '\004' || ptr >= endmesg )  {
                *(ptr+1) = '\0';
                if ( *ptr == '\004' )
                    strcpy(ptr, "%%[ status: endofjob ]%%\n");
                ptr = mesg;
                return(TRUE);
            }   /* End if */
            ptr++;
        }   /* End while */
        if ( canread == TRUE && canwrite == FALSE )     /* read process kludge */
            if ( ++tries > 100 )
                error(FATAL, "printer appears to be offline - shutting down");
        return(FALSE);
    }   /* End if */

    if ( canwrite == TRUE )             /* don't block during start() */
        return(FALSE);

    while ( (ch = getc(fp_ttyi)) != EOF )
        putc(ch, stdout);
    return(FALSE);

}   /* End of readline */
#endif

/*****************************************************************************/

#ifdef V9
#include <ipc.h>

char    tbuf[256];                      /* temporary input buffer */
char    *nptr = tbuf;                   /* next character comes from here */
char    *eptr = tbuf;                   /* one past the last character in tbuf */

setupline()

{

    struct sgttyb       sgtty;
    struct ttydevb      ttydev;         /* for setting up the line */
    static struct tchars        tchar = { '\377',       /* interrupt */
                                          '\377',       /* quit */
                                          '\021',       /* start output */
                                          '\023',       /* stop output */
                                          '\377',       /* end-of-file */
                                          '\377'        /* input delimiter */
                                        };

/*
 *
 * Line initialization for V9.
 *
 */

    if ( line == NULL )  {
        ttyi = ttyo = 1;
        return;
    }   /* End if */
    alarm(120);                 /* watch for hanging opens */
    if ( line[0] == '/' ) {
        if ( (ttyi = open(line, O_RDWR)) == -1 )
        error(FATAL, "can't open %s", line);
    } else if ((ttyi = ipcopen(ipcpath(line, "dk", 0), "")) < 0) {
                sleep(5);       /* wait for Datakit to hangup */
                if ((ttyi = ipcopen(ipcpath(line, "dk", 0), "")) < 0) {
                        fprintf(stderr, "%s", errstr);
                        error(FATAL, "can't ipcopen %s", line);
                }
    }
    alarm(0);

    if ( (ttyo = dup(ttyi)) == -1 )
        error(FATAL, "can't dup file descriptor for %s", line);

    if ( ioctl(ttyi, FIOPUSHLD, &tty_ld) == -1 )
        error(FATAL, "ioctl error - FIOPUSHLD");

    if ( ioctl(ttyi, TIOCGDEV, &ttydev) == -1 )
        error(FATAL, "ioctl error - TIOCGDEV");

    if ( ioctl(ttyi, TIOCGETP, &sgtty) == -1 )
        error(FATAL, "ioctl error - TIOCGETP");

    sgtty.sg_flags &= ~ECHO;
    sgtty.sg_flags &= ~CRMOD;
    sgtty.sg_flags |= CBREAK;
    ttydev.ispeed = baudrate;
    ttydev.ospeed = baudrate;

    if ( ioctl(ttyi, TIOCSDEV, &ttydev) == -1 )
        error(FATAL, "ioctl error - TIOCSDEV");

    if ( ioctl(ttyi, TIOCSETP, &sgtty) == -1 )
        error(FATAL, "ioctl error - TIOCSETP");

    if ( ioctl(ttyi, TIOCSETC, &tchar) == -1 )
        error(FATAL, "ioctl error - TIOCSETC");

    fp_ttyi = fdopen(ttyi, "r");

}   /* End of setupline */

/*****************************************************************************/

resetline()

{

    struct sgttyb       sgtty;

/*
 *
 * Only used if we're running the program as separate read and write processes.
 * Called from split() after the initial connection has been made and returns
 * TRUE if two processes should work. Haven't tested or even compiled the stuff
 * for separate read and write processes on Ninth Edition systems - no guarantees
 * even though we return TRUE!
 *
 */

    if ( ioctl(ttyi, TIOCGETP, &sgtty) == -1 )
        error(FATAL, "ioctl error - TIOCGETP");

    sgtty.sg_flags |= TANDEM;

    if ( ioctl(ttyi, TIOCSETP, &sgtty) == -1 )
        error(FATAL, "ioctl error - TIOCSETP");

    return(TRUE);

}   /* End of resetline */

/*****************************************************************************/

setupstdin(mode)

    int         mode;                   /* what to do with stdin settings */

{

    struct sgttyb               sgtty;

    static int                  saved = FALSE;
    static struct sgttyb        oldsgtty;

/*
 *
 * Save (mode = 0), reset (mode = 1), or restore (mode = 2) the tty settings for
 * stdin. Expect something like raw mode with no echo will be set up. Need to make
 * sure interrupt and quit still work - they're the only good way to exit when
 * we're running interactive mode. I haven't tested or even compiled this code
 * so there are no guarantees.
 *
 */

    if ( interactive == TRUE )
        switch ( mode )  {
            case 0:
                if ( ioctl(0, TIOCGETP, &oldsgtty) == -1 )
                    error(FATAL, "can't save terminal settings");
                saved = TRUE;
                break;

            case 1:
                sgtty = oldsgtty;
                sgtty.sg_flags &= ~ECHO;
                sgtty.sg_flags |= CBREAK;
                ioctl(0, TIOCSETP, &sgtty);
                break;

            case 2:
                if ( saved == TRUE )
                    ioctl(0, TIOCSETP, &oldsgtty);
                break;
        }   /* End switch */

}   /* End of setupstdin */

/*****************************************************************************/

readline()

{

    int         n;                      /* read() return value */
    int         ch;                     /* for interactive mode */

/*
 *
 * Reads characters coming back from the printer on ttyi up to a newline (or EOF)
 * and transfers each line to the mesg[] array. Everything available on ttyi is
 * initially stored in tbuf[] and a line at a time is transferred from there to
 * mesg[]. The string in mesg[] is terminated with a '\0' and TRUE is returned to
 * the caller when we find a newline, EOF, or reach the end of the mesg[] array.
 * If nothing is available on ttyi we return FALSE if a single process is being
 * used for reads and writes, while in the two process implementation we force a
 * one character read. Interactive mode loops here forever, except during start(),
 * echoing everything that comes back on ttyi to stdout. The performance of a
 * simple getc/putc loop for interactive mode was unacceptable when run under mux
 * and has been replaced by more complicated code. When layers wasn't involved
 * the getc/putc loop worked well.
 *
 */

    if ( interactive == FALSE )  {
        while ( 1 )  {
            while ( nptr < eptr )  {    /* grab characters from tbuf */
                *ptr = *nptr++;
                if ( *ptr == '\r' ) continue;
                if ( *ptr == '\n' || *ptr == '\004' || ptr >= endmesg )  {
                    *(ptr+1) = '\0';
                    if ( *ptr == '\004' )
                        strcpy(ptr, "%%[ status: endofjob ]%%\n");
                    ptr = mesg;
                    return(TRUE);
                }   /* End if */
                ++ptr;
            }   /* End for */

            nptr = eptr = tbuf;
            if ( ioctl(ttyi, FIONREAD, &n) < 0 )
                if ( errno == EINTR )
                    continue;
                else error(FATAL, "ioctl error - FIONREAD");
            if ( n <= 0 )
                if ( canwrite == TRUE )
                    return(FALSE);
            n = ((n < 1) ? 1 : ((n < sizeof(tbuf)) ? n : sizeof(tbuf)));
            if ( (n = read(ttyi, tbuf, n)) < 0 )
                if ( errno == EINTR )
                    continue;
                else error(FATAL, "error reading line %s", line);
            else eptr = nptr + n;
        }   /* End while */
    }   /* End if */

    if ( canwrite == TRUE )             /* don't block during start() */
        return(FALSE);

    while ( 1 )  {                      /* only interactive mode gets here */
        if ( ioctl(ttyi, FIONREAD, &n) < 0 )
            error(FATAL, "ioctl error - FIONREAD");
        n = ((n < 1) ? 1 : ((n < sizeof(tbuf)) ? n : sizeof(tbuf)));
        if ( (n = read(ttyi, tbuf, n)) < 0 )
            error(FATAL, "error reading line %s", line);
        else if ( n == 0 )              /* should not happen */
            error(FATAL, "end of file in interactive mode");
        if ( write(1, tbuf, n) != n )
            error(FATAL, "error writing to stdout");
    }   /* End while */

    return(FALSE);

}   /* End of readline */
#endif

/*****************************************************************************/

#ifdef BSD4_2
setupline()

{

    struct sgttyb       sgtty;
    static struct tchars        tchar = { '\377',       /* interrupt */
                                          '\377',       /* quit */
                                          '\021',       /* start output */
                                          '\023',       /* stop output */
                                          '\377',       /* end-of-file */
                                          '\377'        /* input delimiter */
                                        };
    long        lmodes;
    int         disc = NTTYDISC;

/*
 *
 * Line initialization for BSD4_2. As in the System V code, if no line is given
 * (ie. line == NULL) we continue on as before using stdout as ttyi and ttyo.
 *
 */

    if ( line == NULL )
        ttyi = fileno(stdout);
    else if ( (ttyi = open(line, O_RDWR)) == -1 )
        error(FATAL, "can't open %s", line);

    if ( (ttyo = dup(ttyi)) == -1 )
        error(FATAL, "can't dup file descriptor for %s", line);

    if (ioctl(ttyi, TIOCSETD, &disc) == -1 )
        error(FATAL, "ioctl error - TIOCSETD");

    if ( ioctl(ttyi, TIOCGETP, &sgtty) == -1 )
        error(FATAL, "ioctl error - TIOCGETP");

    if ( ioctl(ttyi, TIOCLGET, &lmodes) == -1 )
        error(FATAL, "ioctl error - TIOCLGET");

    sgtty.sg_flags &= ~ECHO;
    sgtty.sg_flags &= ~CRMOD;
    sgtty.sg_flags |= CBREAK;
    sgtty.sg_ispeed = baudrate;
    sgtty.sg_ospeed = baudrate;
    lmodes |= LDECCTQ;

    if ( ioctl(ttyi, TIOCSETP, &sgtty) == -1 )
        error(FATAL, "ioctl error - TIOCSETP");

    if ( ioctl(ttyi, TIOCSETC, &tchar) == -1 )
        error(FATAL, "ioctl error - TIOCSETC");

    if ( ioctl(ttyi, TIOCLSET, &lmodes) == -1 )
        error(FATAL, "ioctl error - TIOCLSET");

    fp_ttyi = fdopen(ttyi, "r");

}   /* End of setupline */

/*****************************************************************************/

resetline()

{

    struct sgttyb       sgtty;

/*
 *
 * Only used if we're running the program as separate read and write processes.
 * Called from split() after the initial connection has been made and returns
 * TRUE if two processes should work. Haven't tested or even compiled the stuff
 * for separate read and write processes on Berkeley systems - no guarantees
 * even though we return TRUE!
 *
 */

    if ( ioctl(ttyi, TIOCGETP, &sgtty) == -1 )
        error(FATAL, "ioctl error - TIOCGETP");

    sgtty.sg_flags |= TANDEM;

    if ( ioctl(ttyi, TIOCSETP, &sgtty) == -1 )
        error(FATAL, "ioctl error - TIOCSETP");

    return(TRUE);

}   /* End of resetline */

/*****************************************************************************/

setupstdin(mode)

    int         mode;                   /* what to do with stdin settings */

{

    struct sgttyb               sgtty;

    static int                  saved = FALSE;
    static struct sgttyb        oldsgtty;

/*
 *
 * Save (mode = 0), reset (mode = 1), or restore (mode = 2) the tty settings for
 * stdin. Expect something like raw mode with no echo will be set up. Need to make
 * sure interrupt and quit still work - they're the only good way to exit when
 * we're running interactive mode. I haven't tested or even compiled this code
 * so there are no guarantees.
 *
 */

    if ( interactive == TRUE )
        switch ( mode )  {
            case 0:
                if ( isatty(0) != 1 )
                    error(FATAL, "stdin not a terminal - can't run interactive mode");
                if ( ioctl(0, TIOCGETP, &oldsgtty) == -1 )
                    error(FATAL, "can't save terminal settings");
                saved = TRUE;
                break;

            case 1:
                sgtty = oldsgtty;
                sgtty.sg_flags &= ~ECHO;
                sgtty.sg_flags |= CBREAK;
                ioctl(0, TIOCSETP, &sgtty);
                break;

            case 2:
                if ( saved == TRUE )
                    ioctl(0, TIOCSETP, &oldsgtty);
                break;
        }   /* End switch */

}   /* End of setupstdin */

/*****************************************************************************/

readline()

{

    int         n;                      /* read() return value */
    int         ch;                     /* for interactive mode */

/*
 *
 * Reads characters coming back from the printer on ttyo up to a newline (or EOF)
 * or until no more characters are available. Characters are put in mesg[], the
 * string is terminated with '\0' when we're done with a line and TRUE is returned
 * to the caller. If complete line wasn't available FALSE is returned. Interactive
 * mode should loop here forever, except during start(), echoing characters to
 * stdout. If it happens to leave FALSE should be returned. Probably should read
 * everything available on ttyi into a temporary buffer and work from there rather
 * than reading one character at a time.
 *
 */

    if ( interactive == FALSE )  {
        while ( 1 )  {
            if ( ioctl(ttyi, FIONREAD, &n) < 0 )
                if ( errno == EINTR )
                    continue;
                else error(FATAL, "ioctl error - FIONREAD");
            if ( n <= 0 )
                if ( canwrite == TRUE )
                    return(FALSE);
                else n = 1;
            for ( ; n > 0; n-- )  {
                /*if ( read(ttyi, ptr, 1) < 0 )*/
                if ( (*ptr = getc(fp_ttyi)) == EOF )
                    if ( errno == EINTR )
                        continue;
                    else error(FATAL, "error reading %s", line);
                if ( *ptr == '\r' ) continue;
                if ( *ptr == '\n' || *ptr == '\004' || ptr >= endmesg )  {
                    *(ptr+1) = '\0';
                    if ( *ptr == '\004' )
                        strcpy(ptr, "%%[ status: endofjob ]%%\n");
                    ptr = mesg;
                    return(TRUE);
                }   /* End if */
                ++ptr;
            }   /* End for */
        }   /* End while */
    }   /* End if */

    if ( canwrite == TRUE )             /* don't block during start() */
        return(FALSE);

    while ( (ch = getc(fp_ttyi)) != EOF )
        putc(ch, stdout);
    return(FALSE);

}   /* End of readline */

/*****************************************************************************/

/*      @(#)strspn.c    1.2     */
/*LINTLIBRARY*/
/*
 * Return the number of characters in the maximum leading segment
 * of string which consists solely of characters from charset.
 */
int
strspn(string, charset)
char    *string;
register char   *charset;
{
        register char *p, *q;

        for(q=string; *q != '\0'; ++q) {
                for(p=charset; *p != '\0' && *p != *q; ++p)
                        ;
                if(*p == '\0')
                        break;
        }
        return(q-string);
}

/*      @(#)strpbrk.c   1.2     */
/*LINTLIBRARY*/
/*
 * Return ptr to first occurance of any character from `brkset'
 * in the character string `string'; NULL if none exists.
 */

char *
strpbrk(string, brkset)
register char *string, *brkset;
{
        register char *p;

        do {
                for(p=brkset; *p != '\0' && *p != *string; ++p)
                        ;
                if(*p != '\0')
                        return(string);
        }
        while(*string++);
        return((char*)0);
}

/*      @(#)strtok.c    1.2     */
/*      3.0 SID #       1.2     */
/*LINTLIBRARY*/
/*
 * uses strpbrk and strspn to break string into tokens on
 * sequentially subsequent calls.  returns NULL when no
 * non-separator characters remain.
 * `subsequent' calls are calls with first argument NULL.
 */


extern int strspn();
extern char *strpbrk();

char *
strtok(string, sepset)
char    *string, *sepset;
{
        register char   *p, *q, *r;
        static char     *savept;

        /*first or subsequent call*/
        p = (string == (char*)0)? savept: string;

        if(p == 0)              /* return if no tokens remaining */
                return((char*)0);

        q = p + strspn(p, sepset);      /* skip leading separators */

        if(*q == '\0')          /* return if no tokens remaining */
                return((char*)0);

        if((r = strpbrk(q, sepset)) == (char*)0)        /* move past token */
                savept = 0;     /* indicate this is last token */
        else {
                *r = '\0';
                savept = ++r;
        }
        return(q);
}
#endif

/*****************************************************************************/

#ifdef DKHOST

#ifndef DKSTREAMS
short   dkrmode[3] = {DKR_TIME, 0, 0};
#endif

dkhost_connect()

{

    int         ofd;                    /* for saving and restoring stderr */
    int         dfd;
    int         retrytime = 5;

/*
 *
 * Tries to connect to a Datakit destination. The extra stuff I've added to save
 * and later restore stderr is primarily for our spooling setup at Murray Hill.
 * postio is usually called with stderr directed to a file that will be returned
 * to the user when the job finishes printing. Problems encountered by dkdial(),
 * like busy messages, go to stderr but don't belong in the user's mail. They'll
 * be temporarily directed to the log file. After we've connected stderr will be
 * restored.
 *
 */

    if ( *line == '\0' )
        error(FATAL, "incomplete Datakit line");

    if ( fp_log != NULL && fp_log != stderr )  {        /* redirect dkdial errors */
        ofd = dup(2);
        close(2);
        dup(fileno(fp_log));
    }   /* End if */

    while ( (dfd = ttyi = dkdial(line)) < 0 )  {
        if ( retrytime < 0 )
            error(FATAL, "can't connect to %s", line);
        sleep(retrytime++);
        if ( retrytime > 60 )
            retrytime = 60;
    }   /* End while */

    if ( fp_log != NULL && fp_log != stderr )  {        /* restore stderr */
        close(2);
        dup(ofd);
        close(ofd);
    }   /* End if */

#ifndef DKSTREAMS
    if ( ioctl(ttyi, DIOCRMODE, dkrmode) == -1 )
        error(FATAL, "ioctl error - DIOCRMODE");

#ifdef DIOURPWD
    if ( window_size > 0 ) {
        short   dkparm[3];

        dkparm[0] = dkminor(ttyi);
        dkparm[1] = 1;
        dkparm[2] = window_size;
        if ( ioctl(ttyi, DIOURPWD, dkparm) < 0 || ioctl(ttyi, DIOCFLUSH, 0) < 0 )
            error(NON_FATAL, "WSA failed");
    }   /* End if */
#endif

    line = dtnamer(dkminor(ttyi));

    if ( (ttyi = open(line, O_RDWR)) == -1 )
        error(FATAL, "can't open %s", line);

    close(dfd);
#endif

}   /* End of dkhost_connect */
#endif

/*****************************************************************************/