char *connv = "CONNECT Command for DG AOS/VS, 5A(044) 10 Oct 92";

/*  C K D C O N  --  Dumb terminal connection to remote system, for AOS/VS */
/*
 Author: Frank da Cruz (fdc@columbia.edu, FDCCU@CUVMA.BITNET),
 Columbia University Center for Computing Activities.
 First released January 1985.
 Copyright (C) 1985, 1992, Trustees of Columbia University in the City of New 
 York.  Permission is granted to any individual or institution to use, copy, or
 redistribute this software so long as it is not sold for profit, provided this
 copyright notice is retained. 
*/

/* This module brought up to 5A by Eugenia Harris at Data General. */

#nolist
#include "ckcdeb.h"                     /* Common things first */
#include <signal.h>                     /* Signals */
#include <errno.h>                      /* Error numbers */
#include <setjmp.h>

/* Kermit-specific includes */

#include "ckcasc.h"                     /* ASCII characters */
#include "ckcker.h"                     /* Kermit things */
#include "ckucmd.h"                     /* For xxesc() prototype */
#include "ckcnet.h"                     /* Network symbols */
#ifndef NOCSETS
#include "ckcxla.h"                     /* Character set translation */
#endif /* NOCSETS */

#ifdef datageneral
#include <sgtty.h>
#include <multitask.h>
#include <packets:normal_io.h>
#list

extern short idel_tbl[7] = {0x4,0,0,0,0,0,0};   /* delimiter table -- */
                                                /* defaults to CR only*/
/* Globals and defines for DG multi-tasking connect command */
void readfromcommline();                        /* listener sub-task */
extern int ttyfd,ttyfdout;
#define TASKID      17                  /* task id of readfromcommline task */
#define TASKPRI   200                 /* priority of readfromcommline (was 2) */
#define STACK       02000               /* default stack size (was 0) */
#define MAXINBUF    2048
static int inbufsize = MAXINBUF;
extern long times();
#endif /* datageneral */

/* Internal function prototypes */

_PROTOTYP( VOID doesc, (char) );
_PROTOTYP( VOID logchar, (char) );
_PROTOTYP( int hconne, (void) );

#ifndef SIGUSR1                         /* User-defined signals */
#define SIGUSR1 30
#endif /* SIGUSR1 */

#ifndef SIGUSR2
#define SIGUSR2 31
#endif /* SIGUSR2 */

/* External variables */

extern int local, escape, duplex, parity, flow, seslog, sessft, debses,
 mdmtyp, ttnproto, cmask, cmdmsk, network, nettype, deblog, sosi, tnlm,
 xitsta, what, ttyfd, quiet, backgrd, tt_crd, tn_nlm;
extern long speed;
extern char ttname[], sesfil[], myhost[],*ccntab[];
#ifdef NETCONN
extern int tn_init;
#endif /* NETCONN */

#ifndef NOSETKEY                        /* Keyboard mapping */
extern KEY *keymap;                     /* Single-character key map */
extern MACRO *macrotab;                 /* Key macro pointer table */
static MACRO kmptr = NULL;              /* Pointer to current key macro */
#endif /* NOSETKEY */

/* Global variables local to this module */

static int quitnow = 0,                 /* <esc-char>Q was typed */
  dohangup = 0,                         /* <esc-char>H was typed */
  sjval = 0,                            /* Setjump return value */
  goterr = 0,                           /* I/O error flag */
  active = 0,                           /* Lower fork active flag */
  inshift = 0;                          /* SO/SI shift state */
  outshift = 0;

static char kbuf[10], *kbp;             /* Keyboard buffer & pointer */
static PID_T parent_id = (PID_T)0;      /* Process id of main task */

static char *ibp;                       /* Input buffer pointer */
static int ibc = 0;                     /* Input buffer count */
#define IBUFL 4096                      /* Input buffer length */

static char *obp;                       /* Output buffer pointer */
static int obc = 0;                     /* Output buffer count */
#define OBUFL 1024                      /* Output buffer length */

#define TMPLEN 200                      /* Temp buffer length */

#ifdef DYNAMIC
static char *ibuf, *obuf, *temp;        /* Input, output, & temp buffers */
#else
static char ibuf[IBUFL], obuf[OBUFL], temp[TMPLEN];
#endif /* DYNAMIC */

/* Character-set items */

#ifndef NOCSETS
#ifdef CK_ANSIC /* ANSI C prototypes... */
extern CHAR (*xls[MAXTCSETS+1][MAXFCSETS+1])(CHAR); /* Character set */
extern CHAR (*xlr[MAXTCSETS+1][MAXFCSETS+1])(CHAR); /* translation functions */
static CHAR (*sxo)(CHAR);       /* Local translation functions */
static CHAR (*rxo)(CHAR);       /* for output (sending) terminal chars */
static CHAR (*sxi)(CHAR);       /* and for input (receiving) terminal chars. */
static CHAR (*rxi)(CHAR);
#else /* Not ANSI C... */
extern CHAR (*xls[MAXTCSETS+1][MAXFCSETS+1])(); /* Character set */
extern CHAR (*xlr[MAXTCSETS+1][MAXFCSETS+1])(); /* translation functions. */
static CHAR (*sxo)();           /* Local translation functions */
static CHAR (*rxo)();           /* for output (sending) terminal chars */
static CHAR (*sxi)();           /* and for input (receiving) terminal chars. */
static CHAR (*rxi)();
#endif /* CK_ANSIC */
extern int language;            /* Current language. */
static int langsv;              /* For remembering language setting. */
extern struct csinfo fcsinfo[]; /* File character set info. */
extern int tcsr, tcsl;          /* Terminal character sets, remote & local. */
static int tcs;                 /* Intermediate ("transfer") character set. */

#ifndef NOESCSEQ
/*
  As of edit 178, the CONNECT command will skip past ANSI escape sequences
  to avoid translating the characters within them.  This allows the CONNECT
  command to work correctly when connected to a remote host that uses a
  7-bit ISO 646 national character set, in which characters like '[' would
  normally be translated into accented characters, ruining the terminal's
  interpretation (and generation) of escape sequences.

  Escape sequences of non-ANSI/ISO-compliant terminals are not handled.
*/
#ifndef SKIPESC
#define SKIPESC
#endif /* SKIPESC */
/*
  States for the escape-sequence recognizer.
*/
#define ES_NORMAL 0                     /* Normal, not in escape sequence */
#define ES_GOTESC 1                     /* Current character is ESC */
#define ES_ESCSEQ 2                     /* Inside an escape sequence */
#define ES_GOTCSI 3                     /* Inside a control sequence */
#define ES_STRING 4                     /* Inside DCS,OSC,PM, or APC string */
#define ES_TERMIN 5                     /* 1st char of string terminator */

static int
  skipesc = 0,                          /* Skip over ANSI escape sequences */
  inesc = ES_NORMAL;                    /* State of sequence recognizer */
/*
  ANSI escape sequence handling.  Only the 7-bit form is treated, because
  translation is not a problem in the 8-bit environment, in which all GL
  characters are ASCII and no translation takes place.  So we don't check
  for the 8-bit single-character versions of CSI, DCS, OSC, APC, or ST.
  Here is the ANSI sequence recognizer state table, followed by the code
  that implements it.

  Definitions:
    CAN = Cancel                       01/08         Ctrl-X
    SUB = Substitute                   01/10         Ctrl-Z
    DCS = Device Control Sequence      01/11 05/00   ESC P
    CSI = Control Sequence Introducer  01/11 05/11   ESC [
    ST  = String Terminator            01/11 05/12   ESC \
    OSC = Operating System Command     01/11 05/13   ESC ]
    PM  = Privacy Message              01/11 05/14   ESC ^
    APC = Application Program Command  01/11 05/15   ESC _

  ANSI escape sequence recognizer:

    State    Input  New State  ; Commentary

    NORMAL   (start)           ; Start in NORMAL state

    (any)    CAN    NORMAL     ; ^X cancels
    (any)    SUB    NORMAL     ; ^Z cancels

    NORMAL   ESC    GOTESC     ; Begin escape sequence
    NORMAL   other             ; NORMAL control or graphic character

    GOTESC   ESC               ; Start again
    GOTESC   [      GOTCSI     ; CSI
    GOTESC   P      STRING     ; DCS introducer, consume through ST
    GOTESC   ]      STRING     ; OSC introducer, consume through ST
    GOTESC   ^      STRING     ; PM  introducer, consume through ST
    GOTESC   _      STRING     ; APC introducer, consume through ST
    GOTESC   0..~   NORMAL     ; 03/00 through 17/14 = Final character
    GOTESC   other  ESCSEQ     ; Intermediate or ignored control character

    ESCSEQ   ESC    GOTESC     ; Start again
    ESCSEQ   0..~   NORMAL     ; 03/00 through 17/14 = Final character
    ESCSEQ   other             ; Intermediate or ignored control character

    GOTCSI   ESC    GOTESC     ; Start again
    GOTCSI   @..~   NORMAL     ; 04/00 through 17/14 = Final character
    GOTCSI   other             ; Intermediate char or ignored control char

    STRING   ESC    TERMIN     ; Maybe have ST
    STRING   other             ; Consume all else

    TERMIN   \      NORMAL     ; End of string
    TERMIN   other  STRING     ; Still in string
*/
/*
  chkaes() -- Check ANSI Escape Sequence.
  Call with EACH character in input stream.
  Sets global inesc variable according to escape sequence state.
*/
VOID
#ifdef CK_ANSIC
chkaes(char c)
#else
chkaes(c) char c;
#endif /* CK_ANSIC */
/* chkaes */ {

    if (c == CAN || c == SUB)           /* CAN and SUB cancel any sequence */
      inesc = ES_NORMAL;
    else                                /* Otherwise */
      switch (inesc) {                  /* enter state switcher */

        case ES_NORMAL:                 /* NORMAL state */
          if (c == ESC)                 /* Got an ESC */
            inesc = ES_GOTESC;          /* Change state to GOTESC */
          break;                        /* Otherwise stay in NORMAL state */

        case ES_GOTESC:                 /* GOTESC state */
          if (c == '[')                 /* Left bracket after ESC is CSI */
            inesc = ES_GOTCSI;          /* Change to GOTCSI state */
          else if (c > 057 && c < 0177) /* Final character '0' thru '~' */
            inesc = ES_NORMAL;          /* Back to normal */
          else if (c == 'P' || (c > 0134 && c < 0140)) /* P, [, ^, or _ */
            inesc = ES_STRING;          /* Switch to STRING-absorption state */
          else if (c != ESC)            /* ESC in an escape sequence... */
            inesc = ES_ESCSEQ;          /* starts a new escape sequence */
          break;                        /* Intermediate or ignored ctrl char */

        case ES_ESCSEQ:                 /* ESCSEQ -- in an escape sequence */
          if (c > 057 && c < 0177)      /* Final character '0' thru '~' */
            inesc = ES_NORMAL;          /* Return to NORMAL state. */
          else if (c == ESC)            /* ESC ... */
            inesc = ES_GOTESC;          /* starts a new escape sequence */
          break;                        /* Intermediate or ignored ctrl char */

        case ES_GOTCSI:                 /* GOTCSI -- In a control sequence */
          if (c > 077 && c < 0177)      /* Final character '@' thru '~' */
            inesc = ES_NORMAL;          /* Return to NORMAL. */
          else if (c == ESC)            /* ESC ... */
            inesc = ES_GOTESC;          /* starts over. */
          break;                        /* Intermediate or ignored ctrl char */

        case ES_STRING:                 /* Inside a string */
          if (c == ESC)                 /* ESC may be 1st char of terminator */
            inesc = ES_TERMIN;          /* Go see. */
          break;                        /* Absorb all other characters. */

        case ES_TERMIN:                 /* May have a string terminator */
          if (c == '\\')                /* which must be backslash */
            inesc = ES_NORMAL;          /* If so, back to NORMAL */
          else                          /* Otherwise */
            inesc = ES_STRING;          /* Back to string absorption. */
      }
}
#endif /* NOESCSEQ */
#endif /* NOCSETS */

/* Connect state parent/child communication signal handlers */

static jmp_buf con_env;          /* Environment pointer for connect errors */
/*
  Note: Some C compilers (e.g. Cray UNICOS) interpret the ANSI C standard
  about setjmp() in a way that disallows constructions like:

    if ((var = setjmp(env)) == 0) ...

  which prevents the value returned by longjmp() from being used at all.
  So the following handlers set a global variable instead.
*/
static
SIGTYP
conn_int(foo) int foo; {                /* Modem read failure handler, */
    signal(SIGUSR1,SIG_IGN);            /* Disarm the interrupt */
    sjval = 1;                          /* Set global variable */
    longjmp(con_env,sjval);             /* Notifies parent process to stop */
}

static
SIGTYP
mode_chg(foo) int foo; {

    signal(SIGUSR2,mode_chg);       /* Re-arm the signal. */
    duplex = 1 - duplex;            /* Toggle duplex mode. */
    debug(F101,"mode_chg duplex","",duplex);
}

/*  C K C P U T F  --  C-Kermit CONNECT Put Character to Screen  */
/*
  Output is buffered to avoid slow screen writes on fast connections.
*/
int
ckcputf() {                             /* Dump the output buffer */
    int x = 0;
    if (obc > 0)                        /* If we have any characters, */
      x = conxo(obc,obuf);              /* dump them, */
    obp = obuf;                         /* reset the pointer */
    obc = 0;                            /* and the counter. */
    return(x);                          /* Return conxo's return code */
}

/*  C K C P U T C  --  C-Kermit CONNECT Put Character to Screen  */
/*
  Output is buffered to avoid slow screen writes on fast connections.
*/
int
ckcputc(c) int c; {
    int x;
 
    *obp++ = c & 0xff;                  /* Deposit the character */
    obc++;                              /* Count it */
    if (ibc == 0 ||                     /* If input buffer empty */
        obc == OBUFL) {                 /* or output buffer full */
        debug(F101,"CKCPUTC obc","",obc);
        x = conxo(obc,obuf);            /* dump the buffer, */
        obp = obuf;                     /* reset the pointer */
        obc = 0;                        /* and the counter. */
        return(x);                      /* Return conxo's return code */
    } else return(0);
}
 
/*  C K C G E T C  --  C-Kermit CONNECT Get Character  */
/*
  Buffered read from communication device.
  Returns the next character, refilling the buffer if necessary.
  On error, returns ttinc's return code (see ttinc() description).
  Dummy argument for compatible calling conventions with ttinc().
*/
int
ckcgetc(dummy) int dummy; {
    int c, n;
 
    debug(F101,"CKCGETC 1 ibc","",ibc); /* Log */
    if (ibc < 1) {                      /* Need to refill buffer? */
        ibc = 0;                        /* Yes, reset count */
        ibp = ibuf;                     /* and buffer pointer */
        debug(F100,"CKCGETC 1 calling ttinc(0)","",0); /* Log */
        c = ttinc(0);                   /* Read one character, blocking */
        debug(F101,"CKCGETC 1 ttinc(0)","",c); /* Log */
        if (c < 0) {                    /* If error, return error code */
            return(c);
        } else {                        /* Otherwise, got one character */
            *ibp++ = c;                 /* Advance buffer pointer */
            ibc++;                      /* and count. */
        }
 
        /* Now quickly read any more that might have arrived */

        if ((n = ttchk()) > 0) {        /* Any more waiting? */
            if (n > (IBUFL - ibc))      /* Get them all at once. */
              n = IBUFL - ibc;          /* Don't overflow buffer */
            if ((n = ttxin(n,(CHAR *)ibp)) > 0) {
                ibp += n;               /* Advance pointer */
                ibc += n;               /* and counter */
            } else return (-1);
        }
        debug(F101,"CKCGETC 2 ibc","",ibc); /* Log how many */
        ibp = ibuf;
    }
    c = *ibp++ & 0xff;                  /* Get next character from buffer */
    ibc--;                              /* Reduce buffer count */
    return(c);                          /* Return the character */
}

/*  C O N E C T  --  Perform terminal connection  */

int
conect() {
    PID_T pid;                  /* Process id of child (modem reader) */
    int n;                      /* General purpose counter */
    int c;                      /* c is a character, but must be signed 
                                   integer to pass thru -1, which is the
                                   modem disconnection signal, and is
                                   different from the character 0377 */
    int c2;                     /* A copy of c */
    int csave;                  /* Another copy of c */
    int num;                    /* Another counter - used with dgncinb() */
    char ch;                    /* Ditto here */

#ifdef DYNAMIC
    if (!(ibuf = malloc(IBUFL+1))) {    /* Allocate input line buffer */
        printf("Sorry, CONNECT input buffer can't be allocated\n");
        return(0);
    }
    if (!(obuf = malloc(OBUFL+1))) {    /* Allocate input line buffer */
        printf("Sorry, CONNECT output buffer can't be allocated\n");
        free(ibuf); ibuf = 0;
        return(0);
    }
    if (!(temp = malloc(TMPLEN+1))) {    /* Allocate temporary buffer */
        printf("Sorry, CONNECT temporary buffer can't be allocated\n");
        free(ibuf); ibuf = 0;
        free(obuf); obuf = 0;
        return(0);
    }
#endif /* DYNAMIC */

    if (!local) {
#ifdef NETCONN
        printf("Sorry, you must SET LINE or SET HOST first\n");
#else
        printf("Sorry, you must SET LINE first\n");
#endif /* NETCONN */
        return(0);
    }
    if (backgrd) {
        printf(
"\r\nSorry, Kermit's CONNECT command can be used only in the foreground\r\n");
        return(0);
    }
    if (speed < 0L && network == 0) {
        printf("Sorry, you must SET SPEED first\n");
        return(0);
    }
#ifdef TCPSOCKET
    if (network && (nettype != NET_TCPB)) {
        printf("Sorry, network type not supported\n");
        return(0);
    }
#endif /* TCPSOCKET */


    if (ttyfd < 0) {                    /* If communication device not open */
        debug(F111,"ckdcon opening",ttname,0); /* Open it now */
        if (ttopen(ttname,&local,mdmtyp,0) < 0) {
            sprintf(temp,"Sorry, can't open %s",ttname);
            perror(temp);
            debug(F110,"ckdcon open failure",temp,0);
#ifdef DYNAMIC
            if (ibuf) free(ibuf); ibuf = 0;
            if (obuf) free(obuf); obuf = 0;
            if (temp) free(temp); temp = 0;
#endif /* DYNAMIC */
            return(0);
        }
    }
    dohangup = 0;                       /* Hangup not requested yet */
    if (!quiet) {
#ifdef NETCONN
        if (network) {
            printf("Connecting to host %s",ttname);
        } else {
#endif /* NETCONN */
            printf("Connecting to %s",ttname);
            if (speed > -1L) printf(", speed %ld",speed);
#ifdef NETCONN
        }
#endif /* NETCONN */
        printf(".\r\nThe escape character is %s (ASCII %d).\r\n",
               dbchr(escape),escape);
        printf("Type the escape character followed by C to get back,\r\n");
        printf("or followed by ? to see other options.\r\n");
        if (seslog) {
            printf("(Session logged to %s, ",sesfil);
            printf("%s)\r\n", sessft ? "binary" : "text");
        }
        if (debses) printf("Debugging Display...)\r\n");
    }

/* Condition console terminal and communication line */     

    if (conbin(escape) < 0) {
        printf("Sorry, can't condition console terminal\n");
#ifdef DYNAMIC
            if (ibuf) free(ibuf); ibuf = 0;
            if (obuf) free(obuf); obuf = 0;
            if (temp) free(temp); temp = 0;
#endif /* DYNAMIC */
        return(0);
    }
    debug(F101,"connect cmask","",cmask);
    debug(F101,"connect cmdmsk","",cmdmsk);
    goterr = 0;
    if ((n = ttvt(speed,flow)) < 0) {   /* Enter "virtual terminal" mode */
        debug(F101,"CONNECT ttvt","",n);
        goterr = 1;                     /* Error recovery... */
        tthang();                       /* Hang up and close the device. */
        ttclos(0);
        if (ttopen(ttname,&local,mdmtyp,0) < 0) { /* Open it again... */
            sprintf(temp,"Sorry, can't reopen %s",ttname);
            perror(temp);
#ifdef DYNAMIC
            if (ibuf) free(ibuf); ibuf = 0;
            if (obuf) free(obuf); obuf = 0;
            if (temp) free(temp); temp = 0;
#endif /* DYNAMIC */
            return(0);
        }
        if (ttvt(speed,flow) < 0) {     /* Try virtual terminal mode again. */
            conres();                   /* Failure this time is fatal. */
            printf("Sorry, Can't condition communication line\n");
#ifdef DYNAMIC
            if (ibuf) free(ibuf); ibuf = 0;
            if (obuf) free(obuf); obuf = 0;
            if (temp) free(temp); temp = 0;
#endif /* DYNAMIC */
            return(0);
        }
#ifdef NETCONN
        if (network && ttnproto == NP_TELNET)
          tn_ini();                     /* Just in case ttopen didn't... */
#endif /* NETCONN */
    }
    debug(F101,"connect ttvt ok, escape","",escape);

#ifndef NOCSETS
/* Set up character set translations */

    tcs = gettcs(tcsr,tcsl);

    if (tcsr == tcsl) {                 /* Remote and local sets the same? */
        sxo = rxo = NULL;               /* If so, no translation. */
        sxi = rxi = NULL;
    } else {                            /* Otherwise, set up */
        sxo = xls[tcs][tcsl];           /* translation function */
        rxo = xlr[tcs][tcsr];           /* pointers for output functions */
        sxi = xls[tcs][tcsr];           /* and for input functions. */
        rxi = xlr[tcs][tcsl];
    }
/*
  This is to prevent use of zmstuff() and zdstuff() by translation functions.
  They only work with disk i/o, not with communication i/o.  Luckily Russian
  translation functions don't do any stuffing...
*/
    langsv = language;
#ifndef NOCYRIL
    if (language != L_RUSSIAN)
#endif /* NOCYRIL */
      language = L_USASCII;

#ifdef SKIPESC
/*
  We need to activate the "skip escape sequence" feature when:
  (a) translation is elected, and
  (b) the local and/or remote set is 7-bit set other than US ASCII.
*/
    skipesc = (tcs != TC_TRANSP) &&     /* Not transparent */
      (fcsinfo[tcsl].size == 128 || fcsinfo[tcsr].size == 128) && /* 7 bits */
        (fcsinfo[tcsl].code != FC_USASCII); /* But not ASCII */
    inesc = ES_NORMAL;                  /* Initial state of recognizer */
#ifdef COMMENT
    debug(F101,"tcs","",tcs);
    debug(F101,"tcsl","",tcsl);
    debug(F101,"tcsr","",tcsr);
    debug(F101,"fcsinfo[tcsl].size","",fcsinfo[tcsl].size);
    debug(F101,"fcsinfo[tcsr].size","",fcsinfo[tcsr].size);
#endif /* COMMENT */
    debug(F101,"skipesc","",skipesc);
#endif /* SKIPESC */
#endif /* NOCSETS */

/*
  This is a label we jump back to when the lower fork senses the need
  to change modes.
*/
newfork:

    debug(F100,"CONNECT starting readfromcommline task","",0);
    parent_id = getpid();               /* Get pid for signalling */
    signal(SIGUSR1,SIG_IGN);            /* Don't kill myself */

/* ENH - DG specifics inserted here - we do an mtask instead of a vfork */
/* of the code that listens to the comm line and writes to the console  */
/* -- that task is called readfromcommline */

/* ENH - commented next because timeouts should be handled with signals now */
/*  setto(channel(ttyfdout),60); */     /* Set output timeouts to 60 seconds */
/*  setto(channel(ttyfd),2);     */     /* Set input timeouts to 2 seconds */
    mfinit(stdout,1);                   /* Protect output to terminal screen */
    if (mtask(readfromcommline, STACK, TASKID, TASKPRI) != 0) {
        conres();                       /* Reset the console. */
        perror("Can't create readfromcommline fork");
        if (!quiet) {
        printf("\r\nCommunications disconnect (Back at %s)\r\n",
               *myhost ? myhost : "local MV system");
        }
        printf("\n");
        what = W_NOTHING;               /* So console modes are set right. */
#ifndef NOCSETS
        language = langsv;              /* Restore language */
#endif /* NOCSETS */
        parent_id = (PID_T) 0;          /* Clean up */
#ifdef DYNAMIC
            if (ibuf) free(ibuf); ibuf = 0;
            if (obuf) free(obuf); obuf = 0;
            if (temp) free(temp); temp = 0;
#endif /* DYNAMIC */
        return(1);
    } else {       /* otherwise start reading from the keyboard (or script) */

        what = W_CONNECT;               /* Keep track of what we're doing */
        active = 1;
        debug(F101,"CONNECT mtask succeeded, duplex:","",duplex);
 
        /* Catch communication errors or mode changes in lower fork */

        if (setjmp(con_env) == 0) {     /* Normal entry... */
            sjval = 0;                  /* Initialize setjmp return code. */
            signal(SIGUSR1,conn_int);   /* Routine for child process exit. */
            signal(SIGUSR2,mode_chg);   /* Routine for mode change. */
        }
 
/*
  Here is the big loop that gets characters from the keyboard and sends them
  out the communication device.  There are two components to the communication
  path: the connection from the keyboard to C-Kermit, and from C-Kermit to
  the remote computer.  The treatment of the 8th bit of keyboard characters
  is governed by SET COMMAND BYTESIZE (cmdmsk).  The treatment of the 8th bit
  of characters sent to the remote is governed by SET TERMINAL BYTESIZE
  (cmask).   This distinction was introduced in edit 5A(164).
*/
            while (active) {
#ifndef NOSETKEY
                if (kmptr) {            /* Have current macro? */
                    debug(F100,"kmptr non NULL","",0);
                    if ((c = (CHAR) *kmptr++) == NUL) { /* Get char from it */
                        kmptr = NULL;   /* If no more chars,  */
                        debug(F100,"macro empty, continuing","",0);
                        continue;       /* reset pointer and continue */
                    }
                    debug(F000,"char from macro","",c);
                } else                  /* No macro... */
#endif /* NOSETKEY */
                setto(channel(0),2);    /* Set device timeout to 2 secs */
                while (active) {        /* Make sure connection still there */
                    /* terrible kludge calling dgncinb() directly -- we do
                       it so we can set the device timeout and thus prevent
                       this read from hanging forever when the remote has
                       disconnected -- all so that we'll pop back to the
                       prompt when the disconnect occurs
                    */
                    num = dgncinb(0,&ch,1); /* Get one keyboard char */
                    if (num != 1) {
                        if ((num == 0) || (num == -2)) /* Keep trying on */
                            continue;                  /* timeout or none */
                        else {                         /* Otherwise it's a*/
                            c == -1;                   /* VS error or EOF */
                            break;                     /* dealt w/ in a sec */
                        }
                    } else {
                        c = ch & 0377;  /* Got a good one */
                        break;          /* Get out of here */
                    }
                }
                resto(channel(0));      /* Undo the device timeout */
                if (!active)            /* If remote disconnected */
                    break;              /* Get out */
                if (c == -1) {          /* If read() got an error... */
                    conoc(BEL);         /* Beep */
                    break;              /* and terminate the read loop */
                }
                /* debug(F111,"** KEYB",dbchr(c),c); */
                c &= cmdmsk;            /* Do any requested masking */
#ifndef NOSETKEY
/*
  Note: kmptr is NULL if we got character c from the keyboard, and it is
  not NULL if it came from a macro.  In the latter case, we must avoid
  expanding it again.
*/
                if (!kmptr && macrotab[c]) { /* Macro definition for c? */
                    kmptr = macrotab[c];     /* Yes, set up macro pointer */
                    continue;                /* and restart the loop, */
                } else c = keymap[c];        /* else use single-char keymap */
#endif /* NOSETKEY */
                if (
 
#ifndef NOSETKEY
                    !kmptr &&
#endif /* NOSETKEY */
                    ((c & 0x7f) == escape)) { /* Escape character? */
                    debug(F000,"connect got escape","",c);
                    c = congks(0) & 0177; /* Got esc, get its arg */
                    /* No key mapping here */
                    doesc(c);           /* Now process it */
 
                } else {                /* It's not the escape character */
                    csave = c;          /* Save it before translation */
                                        /* for local echoing. */
#ifndef NOCSETS
#ifndef SKIPESC
                    /* Translate character sets */
                    if (sxo) c = (*sxo)(c); /* From local to intermediate. */
                    if (rxo) c = (*rxo)(c); /* From intermediate to remote. */
#else
                    if (inesc == ES_NORMAL) { /* If not inside escape seq.. */
                        /* Translate character sets */
                        if (sxo) c = (*sxo)(c); /* Local to intermediate. */
                        if (rxo) c = (*rxo)(c); /* Intermediate to remote. */
                    }
                    if (skipesc) chkaes(c); /* Check escape sequence status */
#endif /* SKIPESC */
#endif /* NOCSETS */
/*
 If Shift-In/Shift-Out is selected and we have a 7-bit connection,
 handle shifting here.
*/
                    if (sosi) {                    /* Shift-In/Out selected? */
                        if (cmask == 0177) {       /* In 7-bit environment? */
                            if (c & 0200) {        /* 8-bit character? */
                                if (outshift == 0) {    /* If not shifted, */
                                    ttoc(dopar(SO));    /* shift. */
                                    outshift = 1;
                                }
                            } else {
                                if (outshift == 1) {    /* 7-bit character */
                                    ttoc(dopar(SI));    /* If shifted, */
                                    outshift = 0;       /* unshift. */
                                }
                            }
                        }
                        if (c == SO) outshift = 1; /* User typed SO */
                        if (c == SI) outshift = 0; /* User typed SI */
                    }
                    c &= cmask;         /* Apply Kermit-to-host mask now. */
                    if (c == '\015') {
                        if (tnlm        /* TEMINAL NEWLINE ON */
#ifdef TNCODE                           /* And for TELNET... */
                        || (network && ttnproto == NP_TELNET)
#endif /* TNCODE */
                        ) {
                            ttoc(dopar('\015'));        /* Send CR */
                            if (duplex) conoc('\015');  /* Maybe echo CR */
#ifdef TNCODE
                            if (network && !tn_nlm && ttnproto == NP_TELNET)
                                c = '\0';               /* Stuff NUL */
                            else
#endif /* TNCODE */
                            c = '\012';                 /* Stuff LF */
                            csave = c;
                        }
                    }                   /* Now go on to process LF or NUL */
#ifdef TNCODE
/* If user types the 0xff character (TELNET IAC), it must be doubled. */
                    else
                      if (c == IAC && network && ttnproto == NP_TELNET) {
                                        /* Send one copy now */
                        ttoc(IAC);      /* and the other one just below. */
                    }
#endif /* TNCODE */
                    /* Send the character */
 
                    if (ttoc(dopar(c)) > -1) {
                        if (duplex) {   /* If half duplex, must echo */
                            if (debses)
                              conol(dbchr(csave)); /* the original char */
                            else                   /* not the translated one */
                              conoc(csave);
                            if (seslog) { /* And maybe log it too */
                                c2 = csave;
                                if (sessft == 0 && csave == '\r')
                                  c2 = '\n';
                                logchar(c2);
                            }
                        }
                    } else if (active){  /* UNIX doesn't check for active */
                        perror("\r\nCan't send character");
                        break;           /* UNIX clears active flag instead */
                    }
                }
            } 
        midkill(TASKID);                /* kill comm line reader task */
        if (sjval == 1) {               /* Read error on comm device */
            dohangup = 1;
#ifdef NETCONN
            if (network) {
                ttclos(0);
            }
#endif /* NETCONN */
        }
        if (sjval == 2)                 /* If it was a mode change, go back */
          goto newfork;                 /* and coordinate with other fork. */
        conres();                       /* Reset the console. */
        if (quitnow) doexit(GOOD_EXIT,xitsta); /* Exit now if requested. */
        if (dohangup > 0) {
#ifndef NODIAL
            if (dohangup > 1)           /* If hangup requested, do that. */
                if (mdmhup() < 1)       /* Try via modem first */
#endif /* NODIAL */
                tthang();               /* And make sure we don't hang up */
            dohangup = 0;               /* again unless requested again. */
        }
        mfinit(stdout,0);               /* Un-protect output to screen */
        what = W_NOTHING;               /* So console modes set right. */
#ifndef NOCSETS
        language = langsv;              /* Restore language */
#endif /* NOCSETS */
        parent_id = (PID_T) 0;
#ifdef DYNAMIC
            if (ibuf) free(ibuf); ibuf = 0;
            if (obuf) free(obuf); obuf = 0;
            if (temp) free(temp); temp = 0;
#endif /* DYNAMIC */
        return(1);
    } /* else */
}

void
readfromcommline() {
    int c;
    int i;
    int n;
    int tx,x;                     /* variables needed for tn_doop code */
 
        if (priv_can()) {               /* Cancel all privs */
            printf("?setuid error - fatal\n");
            doexit(BAD_EXIT,-1);
        }
        signal(SIGINT, SIG_IGN);        /* In case these haven't been */
        signal(SIGQUIT, SIG_IGN);       /* inherited from above... */
 
        inshift = outshift = 0;         /* Initial shift state. */
        sleep(1);                       /* Wait for parent's handler setup.  */
        ibp = ibuf;                     /* Initialize input buffering */
        ibc = 0;                        /* And output buffering. */
        obp = obuf;
        obc = 0;
        debug(F100,"CONNECT starting port task (readfromcommline)","",0);
        while (active)  {            /* Fresh read, wait for a character. */
/*
  Get the next communication line character from our internal buffer.
  If the buffer is empty, refill it.
*/
                c = ckcgetc(0);         /* Get next character */
                /* debug(F101,"CONNECT c","",c); */
                if (c < 0) {
                    active = 0;         /* deviation from unix code */
                    if (!quiet) {       /* Failed... */
                     printf("\r\nCommunications disconnect (Back at %s)\r\n",
                             *myhost ? myhost : "local MV system");
                    if ( c == -3)
                           perror("\r\nCan't read character");
                    }
#ifndef NODIAL
                    if (mdmhup() < 1)
#endif /* NODIAL */
                      tthang();           /* Hang up our side. */
                    sjval = 1;            /* Notify parent - kludge */
                    for (;;) pause();     /* Wait to be killed */
                }
                debug(F111,"** PORT",dbchr(c),c);
#ifdef TNCODE
                /* Handle TELNET negotiations here */
                if (c == IAC && network && ttnproto == NP_TELNET) {
                    debug(F111,"got IAC from port",dbchr(c),c);
                    ckcputf();          /* Dump output buffer */
                    tx = tn_doop((c & 0xff),duplex,ckcgetc);
                    debug(F111,"tn_doop returns ","",tx);
                    if (tx == 0)
                        continue;
                    else if (tx == -1) {                /* I/O error */
                        if (active && !quiet)
                      printf("\r\nCommunications disconnect (Back at %s)\r\n",
                             *myhost ? myhost : "local MV system");
                        active = 0;
                        sjval = 1;          /* Notify parent - kludge */
                        for (;;) pause();   /* Wait to be killed. */
                    } else if ((tx == 1) && (!duplex)) { /* ECHO change */
                        if (parent_id)
                            kill(parent_id,SIGUSR2);    /* Tell the parent */
                        duplex = 1;
                    } else if ((tx == 2) && (duplex)) { /* ECHO change */
                        if (parent_id)
                            kill(parent_id,SIGUSR2);
                        duplex = 0;
                    } else if (tx == 3) { /* Quoted IAC */
                        c = 255;
                    } else continue;    /* Negotiation OK, get next char. */
                }
#endif /* TNCODE */
                if (debses) {           /* Output character to screen */
                    char *s;            /* Debugging display... */
                    s = dbchr(c);
                    while (*s)
                      ckcputc(*s++);
                } else {                /* or regular display ... */
                    c &= cmask;         /* Apply Kermit-to-remote mask */
                    if (sosi) {         /* Handle SI/SO */
                        if (c == SO) {  /* Shift Out */
                            inshift = 1;
                            continue;
                        } else if (c == SI) { /* Shift In */
                            inshift = 0;
                            continue;
                        }
                        if (inshift) c |= 0200;
                    }
#ifndef NOCSETS
#ifndef SKIPESC
                    /* Translate character sets */
                    if (sxi) c = (*sxi)(c);
                    if (rxi) c = (*rxi)(c);
#else
                    if (inesc == ES_NORMAL) {
                        /* Translate character sets */
                        if (sxi) c = (*sxi)(c);
                        if (rxi) c = (*rxi)(c);
                    }
                    if (skipesc) chkaes(c); /* Adjust escape sequence status */
#endif /* SKIPESC */
#endif /* NOCSETS */
                    c &= cmdmsk;                /* Apply command mask. */
                    if (c == CR && tt_crd) { /* SET TERM CR-DISPLAY CRLF ? */
                        ckcputc(c);          /* Yes, output CR */
                        if (seslog) logchar(c);
                        c = LF;              /* and insert a linefeed */
                    }
                    ckcputc(c);                 /* Output to screen */
                    if (seslog) logchar(c);     /* Take care of session log */
                }
        }
} 



/*  H C O N N E  --  Give help message for connect.  */

int
hconne() {
    int c;
    static char *hlpmsg[] = {
"\r\n  ? for this message",
"\r\n  0 (zero) to send a null",
"\r\n  B to send a BREAK",
#ifdef NETCONN
"\r\n  I to send a network interrupt packet",
#ifdef TCPSOCKET
"\r\n  A to send Are You There?",
#endif /* TCPSOCKET */
#endif /* NETCONN */
"\r\n  H to hangup and close the connection",
"\r\n  Q to hangup and quit Kermit",
"\r\n  S for status",
"\r\n  ! to push to local shell",
"\r\n  \\ backslash code:",
"\r\n    \\nnn decimal character code",
"\r\n    \\Onnn octal character code",
"\r\n    \\Xhh  hexadecimal character code",
"\r\n    terminate with carriage return.",
"\r\n type the escape character twice to send the escape character",
"\r\n space-bar to resume the CONNECT command\r\n\r\n",
"" };
    conol("\r\nPress C to return to ");
    conol(*myhost ? myhost : "the C-Kermit prompt");
    conol(", or:");
    conola(hlpmsg);                     /* Print the help message. */
    conol("Command>");                  /* Prompt for command. */
    c = congks(0) & 0177;               /* Get character, strip any parity. */
    /* No key mapping or translation here */
    if (c != CMDQ)
      conoll("");
    return(c);                          /* Return it. */
}


/*  D O E S C  --  Process an escape character argument  */

VOID
#ifdef CK_ANSIC
doesc(char c)
#else
doesc(c) char c;
#endif /* CK_ANSIC */
/* doesc */ {
    CHAR d, buf[3];
  
    while (1) {
        if (c == escape) {              /* Send escape character */
            d = dopar(c); ttoc(d); return;
        } else                          /* Or else look it up below. */
            if (isupper(c)) c = tolower(c);

        switch(c) {

        case 'c':                       /* Close connection */
        case '\03':
            active = 0; conol("\r\n"); return;

        case 'b':                       /* Send a BREAK signal */
        case '\02':
            ttsndb(); return;

#ifdef NETCONN
        case 'i':                       /* Send Interrupt */
        case '\011':
#ifdef TCPSOCKET
#ifndef IP
#define IP 244
#endif /* IP */
            if (network && ttnproto == NP_TELNET) { /* TELNET */
                buf[0] = (CHAR) IAC;    /* I Am a Command */
                buf[1] = (CHAR) IP;     /* Interrupt Process */
                ttol(buf,2);
            } else
#endif /* TCPSOCKET */
              conoc(BEL);
            return;
#ifdef TCPSOCKET
        case 'a':                       /* "Are You There?" */
        case '\01':
#ifndef AYT
#define AYT 246
#endif /* AYT */
            if (network && ttnproto == NP_TELNET) {
                buf[0] = (CHAR) IAC;    /* I Am a Command */
                buf[1] = (CHAR) AYT;    /* Are You There? */
                ttol(buf,2);
            } else conoc(BEL);
            return;
#endif /* TCPSOCKET */
#endif /* NETCONN */

        case 'h':                       /* Hangup */
    /*  case '\010':  */		/* Too dangerous */
            dohangup = 2; active = 0; conol("\r\nHanging up "); return;

        case 'q':
            quitnow = 1; active = 0; conol("\r\n"); return;

        case 's':                       /* Status */
            sprintf(temp,
                    "\r\nConnected %s %s", network ? "to" : "through", ttname);
            conol(temp);
            if (speed >= 0L) {
                sprintf(temp,", speed %ld",speed); conol(temp);
            }
            sprintf(temp,", %d terminal bits",(cmask == 0177) ? 7 : 8);
            conol(temp);
            if (parity) {
                conol(", ");
                switch (parity) {
                    case 'e': conol("even");  break;
                    case 'o': conol("odd");   break;
                    case 's': conol("space"); break;
                    case 'm': conol("mark");  break;
                }
                conol(" parity");
            }
            if (seslog) {
                conol(", logging to "); conol(sesfil);
            }
            conoll("");
            if (!network) shomdm();
            return;

        case '?':                       /* Help */
            c = hconne(); continue;

        case '0':                       /* Send a null */
            c = '\0'; d = dopar(c); ttoc(d); return;

#ifndef NOPUSH
        case '@':                       /* Start inferior command processor */
        case '!':
            conres();                   /* Put console back to normal */
            zshcmd("");                 /* Fork a shell. */
            if (conbin(escape) < 0) {
                printf("Error resuming CONNECT session\n");
                active = 0;
            }
            return;
#endif /* NOPUSH */

        case SP:                        /* Space, ignore */
            return;

        default:                        /* Other */
            if (c == CMDQ) {            /* Backslash escape */
                int x;
                kbp = kbuf;
                *kbp++ = c;
                while (((c = (congks(0) & cmdmsk)) != '\r') && (c != '\n'))
                  *kbp++ = c;
                *kbp = NUL; kbp = kbuf;
                x = xxesc(&kbp);        /* Interpret it */
                if (x >= 0) {           /* No key mapping here */
                    c = dopar(x);
                    ttoc(c);
                    return;
                } else {                /* Invalid backslash code. */
                    conoc(BEL);
                    return;
                }
            }
            conoc(BEL); return;         /* Invalid esc arg, beep */
        }
    }
}

VOID
#ifdef CK_ANSIC
logchar(char c)
#else
logchar(c) char c;
#endif /* CK_ANSIC */
/* logchar */ {                 /* Log character c to session log */
    if (seslog) 
      if ((sessft != 0) ||
          (c != '\r' &&
           c != '\0' &&
           c != XON &&
           c != XOFF))
        if (zchout(ZSFILE,c) < 0) {
            conoll("");
            conoll("ERROR WRITING SESSION LOG, LOG CLOSED!");
            seslog = 0;
        }
}