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supdupd.c
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supdupd.c
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/* SUPDUP Server
*
* Written Jan. 84 by David Bridgham. The organization and some of
* the code was taken from the telnet server written by Berkeley for 4.2.
*/
/* Hacked by Mly to clarify ITS ITP July 1987
* Hacked by Mly 29-Aug-87 to nuke stupid auto_right_margin lossage
* Hacked by Mly 2-Sep-87 to send params as "4;" and "146;" rather than
* "\004" and "\222" to avoid stupid un*x 8-bit-and-control-d non-transparency
* Hacked by wesommer@athena.mit.edu 25-Jan-88 to use winning 4.3BSD
* -p flag to /bin/login and to do TIOCSWINSZ stuff.
* #ifdef TTYLOC around ttyloc-hacking parts
*/
/* The magic number #o176 which appears in this file is the difference
* between the real Supdup TDxxx codes and the kludge codes which appear
* in the termcap/terminfo descriptions (which are needed because bloody
* un*x deals incompetently with chars with the #o200 bit on
* (as well as with #o004. Cretins.)
* Thus, for example, we have %TDMV0 = #o217, with "cm=\177\021%d;%d;:"
* in the termcap entry; (- #o 217 #o021) => #o176
*/
/* #define TERMINFO 1 */ /* Define if want terminfo support. */
/* there should be a TERMCAP too */
#define _XOPEN_SOURCE 500 /* for unlockpt and ptsname */
#define _DEFAULT_SOURCE
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/select.h>
#include <netinet/in.h>
#include <unistd.h>
#include <termios.h>
/* #include <arpa/telnet.h> */
#include "supdup.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <time.h>
#include <errno.h>
#include <sgtty.h>
#include <netdb.h>
#ifdef TERMINFO
# include <term.h>
# undef CUR
# define CUR
#endif /* TERMINFO */
#ifndef BANNER
#define BANNER "MIT Artificial Intelligence Laboratory 4.2 BSD UNIX (%s)\207%s"
#endif
#ifndef SBANNER
#define SBANNER "%s SUPDUP from %s"
#endif
/* * I/O data buffers, pointers, and counters. */
unsigned char ptyibuf[BUFSIZ], *ptyip = ptyibuf;
unsigned char ptyobuf[BUFSIZ], *pfrontp = ptyobuf, *pbackp = ptyobuf;
unsigned char netibuf[BUFSIZ], *netip = netibuf;
unsigned char netobuf[BUFSIZ], *nfrontp = netobuf, *nbackp = netobuf;
int pcc, ncc;
/* Filedesc for stream connected to local un*x pty. */
int pty;
/* Filedesc for stream connected to user (via internet) */
int net;
#ifdef DAEMON
static struct sockaddr_in sin = { AF_INET };
#endif
void reapchild (void);
void doit (int f, struct sockaddr_in *who);
void fatal (int f, char *msg);
void fatalperror (int f, char *msg, int errn);
void sup_options (int net);
void supdup (int f, int p);
void change_lflag (int on, int off);
void ptyflush (void);
void netflush (void);
void supxmit (void);
void suprcv (void);
void do_crlf (void);
void cleanup (void);
void rmut (void);
char pty_name[FILENAME_MAX];
#ifdef TTYLOC
char ttyloc[64];
#endif /* TTYLOC */
extern char **environ;
/* Current cursor position */
int currcol, currline;
#ifndef TERMINFO /* terminfo defines these itself */
/* Number of columns, lines of virtual terminal */
int columns, lines;
#endif
#ifndef DEBUG
#define DPRINTF(a, b, c) {}
#else /* DEBUG */
#define DPRINTF(a, b, c) \
if (debug_output) \
{ fprintf (debug_output, (a), (b), (c)); fflush (debug_output); }
FILE *debug_output = 0;
void
open_debug_output (void)
{
debug_output = fopen ("/supdupd.debug", "w");
if (debug_output < 0)
{
fprintf (stderr, "Couldn't open \"/supdupd.debug\"\n");
debug_output = 0;
}
DPRINTF ("Starting up supdupd...\n",0,0);
}
#endif /* DEBUG */
#if 0
/* this routine is used for debugging only */
void echo_char (unsigned char c)
{
static int count = 0;
if (count++ > 16)
{
printf ("\n");
count = 0;
}
if (c >= '\177') printf ("\\%o ", c);
else if (c < '\041') printf ("\\%o ", c);
else printf ("%c ", c);
fflush (stdout);
}
#endif /* 0 */
#ifdef DAEMON
int main (int argc, char *argv[])
{
int s, pid, options;
struct servent *sp;
#ifdef DEBUG
open_debug_output ();
#endif /* DEBUG */
sp = getservbyname ("supdup", "tcp");
if (sp == 0)
{
fprintf (stderr, "supdupd: tcp/supdup: unknown service\n");
exit (1);
}
sin.sin_port = sp->s_port;
argc--, argv++;
if (argc > 0 && !strcmp (*argv, "-d"))
{
options |= SO_DEBUG;
argc--, argv++;
}
if (argc > 0)
{
sin.sin_port = atoi (*argv);
if (sin.sin_port <= 0)
{
fprintf (stderr, "supdupd: %s: bad port #\n", *argv);
exit (1);
}
sin.sin_port = htons ((u_short)sin.sin_port);
}
#ifndef DEBUG
if (fork ())
exit (0);
for (s = 0; s < 10; s++)
(void) close (s);
(void) open ("/", 0);
(void) dup2 (0, 1);
(void) dup2 (0, 2);
{
int tt = open ("/dev/tty", 2);
if (tt > 0)
{
ioctl (tt, TIOCNOTTY, 0);
close (tt);
}
}
#endif /* DEBUG */
again:
s = socket (AF_INET, SOCK_STREAM, 0);
if (s < 0)
{
perror ("supdupd: socket");;
sleep (5);
goto again;
}
if (options & SO_DEBUG)
if (setsockopt (s, SOL_SOCKET, SO_DEBUG, 0, 0) < 0)
perror ("telnetd: setsockopt (SO_DEBUG)");
if (setsockopt (s, SOL_SOCKET, SO_KEEPALIVE, 0, 0) < 0)
perror ("supdupd: setsockopt (SO_KEEPALIVE)");
while (bind (s, (caddr_t) &sin, sizeof (sin)) < 0)
{
perror ("supdupd: bind");
sleep (5);
}
signal (SIGCHLD, reapchild);
listen (s, 10);
for (;;)
{
struct sockaddr_in from;
int s2, fromlen = sizeof (from);
s2 = accept (s, (caddr_t)&from, &fromlen);
if (s2 < 0)
{
if (errno == EINTR)
continue;
perror ("supdupd: accept");
sleep (1);
continue;
}
if ((pid = fork ()) < 0)
printf ("Out of processes\n");
else if (pid == 0)
{
signal (SIGCHLD, SIG_DFL);
doit (s2, &from);
}
close (s2);
}
/*NOTREACHED*/
}
#else /* not DAEMON */
int main (int argc, char *argv[])
{
struct sockaddr_in from;
socklen_t fromlen = sizeof(from);
#ifdef DEBUG
open_debug_output ();
#endif /* DEBUG */
fromlen = sizeof (from);
if (getpeername (0, (struct sockaddr *)&from, &fromlen) < 0)
{
fprintf (stderr, "%s: ", argv[0]);
perror ("getpeername");
_exit (1);
}
/* MIT */
#ifdef KEEPALIVE
if (setsockopt (0, SOL_SOCKET, SO_KEEPALIVE, 0, 0) < 0)
{
fprintf (stderr, "%s: ", argv[0]);
perror ("setsockopt (SO_KEEPALIVE)");
}
#endif /* KEEPALIVE */
/* MIT */
doit (0, &from);
}
#endif /* DAEMON */
void reapchild (void)
{
int status;
while (wait3 (&status, WNOHANG, 0) > 0)
;
}
/* #ifdef TERMCAP */
char termcap[1024];
/* #endif // TERMCAP */
#ifdef TERMINFO
char terminfo[64];
#endif /* TERMINFO */
char *envinit[] =
{
"TERM=supdup",
/* #ifdef TERMCAP */
termcap,
/* #endif // TERMCAP */
#ifdef TERMINFO
terminfo,
#endif /* TERMINFO */
0
};
char *host;
#ifdef TIOCSWINSZ
struct winsize ws;
#endif
/*
* Get a pty, scan input lines.
*/
void doit (int f, struct sockaddr_in *who)
{
char *cp, *ntoa ();
int i, p, t;
struct termios b;
struct hostent *hp;
p = open ("/dev/ptmx", O_RDWR, 0);
if (p < 0)
fatal (f, "Couldn't get a pty");
if (grantpt(p) < 0)
fatalperror (f, "grantpt", errno);
if (unlockpt(p) < 0)
fatalperror (f, "unlockpt", errno);
if ((cp = ptsname(p)) == NULL)
fatalperror (f, "ptsname", errno);
dup2 (f, 0);
t = open ("/dev/tty", O_RDWR, 0);
if (t >= 0)
{
ioctl (t, TIOCNOTTY, 0);
close (t);
}
t = open (cp, O_RDWR, 0);
if (t < 0)
fatalperror (f, cp, errno);
tcgetattr (t, &b);
/* MIT */
cfsetispeed(&b, B9600);
cfsetospeed(&b, B9600);
/* MIT */
b.c_oflag |= XTABS;
tcsetattr (t, 0, &b);
tcgetattr (p, &b);
b.c_lflag &= ~ECHO;
tcsetattr (p, 0, &b);
sup_options (f);
#ifdef TIOCSWINSZ
ioctl (p, TIOCSWINSZ, &ws);
#endif /* TIOCSWINSZ */
hp = gethostbyaddr (&who->sin_addr, sizeof (struct in_addr),
who->sin_family);
if (hp)
host = hp->h_name;
else
host = ntoa (who->sin_addr);
if ((i = fork ()) < 0)
fatalperror (f, "fork", errno);
if (i)
supdup (f, p);
close (f);
close (p);
dup2 (t, 0);
dup2 (t, 1);
dup2 (t, 2);
close (t);
#ifdef BSD4_3
/* Winning -p switch passes through environment */
execle ("/bin/login", "login", "-p", "-h", host, (char *)0, envinit);
#else
#ifdef MIT
/* Local /bin/login at ai.mit.edu machines hacked to pass TERM and TERMCAP */
execle ("/bin/login", "login", "-h", host, (char *)0, envinit);
fatalperror (2, "/bin/login", errno);
#else
/* Can't use /bin/login as that nukes TERM and TERMCAP. Cretins! */
/* For now, be a cretin and use /bin/login anyway. */
/* execle ("/usr/etc/supdup-login", "login", "-h", host, (char *)0, envinit);
fatalperror (2, "/usr/etc/supdup-login", errno); */
execle ("/bin/login", "login", (char *)0, envinit);
#endif /* MIT */
#endif /* not BSD4_3 */
/*NOTREACHED*/
}
void fatal (int f, char *msg)
{
char buf[BUFSIZ];
(void) sprintf (buf, "supdupd: %s.\r\n", msg);
(void) write (f, buf, strlen (buf));
exit (1);
}
void fatalperror (int f, char *msg, int errn)
{
char buf[BUFSIZ];
(void) sprintf (buf, "%s: %s", msg, strerror(errn));
fatal (f, buf);
}
static void sig_handler_cleanup(int sig) { cleanup(); }
/*
* Main loop. Select from pty and network, and
* hand data to supdup receiver finite state machine.
*/
void supdup (int f, int p)
{
int on = 1;
char hostname[256];
net = f, pty = p;
ioctl (f, FIONBIO, &on);
ioctl (p, FIONBIO, &on);
signal (SIGTSTP, SIG_IGN);
signal (SIGCHLD, sig_handler_cleanup);
change_lflag (ECHO, 0);
/*
* Print supdup banner.
*/
gethostname (hostname, sizeof (hostname));
nfrontp += sprintf ((char *) nfrontp, SBANNER, hostname, host);
*nfrontp++ = TDNOP;
netflush ();
sleep (2);
/*
* Show banner that getty never gave.
*/
*nfrontp++ = TDCLR;
nfrontp += sprintf ((char *)nfrontp, BANNER, hostname, "");
currline = 1;
currcol = 0;
for (;;)
{
fd_set ibits, obits;
int maxfd = p > f ? p : f;
FD_ZERO(&ibits);
FD_ZERO(&obits);
/*
* Never look for input if there's still
* stuff in the corresponding output buffer
*/
if ((nfrontp - nbackp) || pcc > 0)
FD_SET(f, &obits);
else
FD_SET(p, &ibits);
if ((pfrontp - pbackp) || ncc > 0)
FD_SET(p, &obits);
else
FD_SET(f, &ibits);
if (ncc < 0 && pcc < 0)
break;
select (maxfd + 1, &ibits, &obits, NULL, NULL);
/*
* Something to read from the network...
*/
if (FD_ISSET(f, &ibits))
{
ncc = read (f, netibuf, BUFSIZ);
if (ncc < 0 && errno == EWOULDBLOCK)
ncc = 0;
else
{
if (ncc <= 0)
break;
netip = netibuf;
}
}
/*
* Something to read from the pty...
*/
if (FD_ISSET(p, &ibits))
{
pcc = read (p, ptyibuf, BUFSIZ);
if (pcc < 0 && errno == EWOULDBLOCK)
pcc = 0;
else
{
if (pcc <= 0)
break;
ptyip = ptyibuf;
}
}
if (pcc > 0)
supxmit ();
if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0)
netflush ();
if (ncc > 0)
suprcv ();
if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0)
ptyflush ();
}
cleanup ();
}
/* State for xmit fsm */
#define XS_DATA 0 /* base state */
#define XS_ESCAPE 1 /* supdup commands are escaped in TERMCAP */
#define XS_MV0_V 2 /* getting vertical position for TDMV0 */
#define XS_MV0_H 4 /* getting horizontal position for TDMV0 */
#define XS_CRLF 6 /* got \r looking for \n */
#define XS_LFCR 7 /* got \n looking for \r */
#if (TDILP < 8) || (TDDLP < 8) || (TDICP < 8) || (TDDCP < 8)
you lose!
#endif
#define XS_ILINE TDILP /* waiting for number of lines to insert */
#define XS_DLINE TDDLP /* waiting for number of lines to delete */
#define XS_ICHAR TDICP /* waiting for number of chars to insert */
#define XS_DCHAR TDDCP /* waiting for number of chars to delete */
/* Because of Un*x Brain Death(tm)
* characters with the 200 bit don't go through the terminal driver reliably
* and \004 won't go through a un*x at all pty (what sort of bozos wrote
* this sh*t?)
*/
void supxmit (void)
{
static int state = XS_DATA;
register int c;
static int piece_o_state, piece_o_state_v;
while (pcc > 0)
{
if ((&netobuf[BUFSIZ] - nfrontp) < 4)
/* Caller will flush pending output */
return;
c = *ptyip++ & 0377; pcc--;
switch (state)
{
case XS_DATA:
switch (c)
{
case ITP_ESCAPE:
*nfrontp++ = c;
*nfrontp++ = c;
break;
case KLUDGE_ESCAPE:
state = XS_ESCAPE;
break;
case '\007':
*nfrontp++ = TDBEL;
break;
case '\t':
currcol = (currcol + 8) & ~7;
if (currcol >= columns)
currcol = columns;
*nfrontp++ = TDMV0;
*nfrontp++ = currline;
*nfrontp++ = currcol;
break;
case '\b':
currcol--;
if (currcol < 0)
currcol = 0;
*nfrontp++ = TDMV0;
*nfrontp++ = currline;
*nfrontp++ = currcol;
break;
case '\r':
DPRINTF ("\n<<Got a return>>",0,0);
state = XS_CRLF;
break;
case '\n':
DPRINTF ("\n<<Got a newline>>",0,0);
state = XS_LFCR;
break;
case '\0':
/* throw away nulls. Something is being
* a twit and padding even though it
* is not wanted! */
/* (Of course, \0 is really a printable MIT Ascii character) */
break;
default:
if (currcol < columns)
{
currcol++;
*nfrontp++ = c;
}
else
{
/* unread-char and do newline */
ptyip--; pcc++;
do_crlf ();
}
break;
}
break;
case XS_ESCAPE:
c += 0176;
switch (c)
{
case TDCRL:
state = XS_DATA;
do_crlf ();
break;
case TDFS:
currcol++;
state = XS_DATA;
*nfrontp++ = c;
break;
case TDMV0:
state = XS_MV0_V;
piece_o_state = 0;
piece_o_state_v = 0;
break;
case TDCLR:
DPRINTF ("\n<<In TDCLR handler>>",0,0);
currcol = 0; currline = 0;
state = XS_DATA;
*nfrontp++ = c;
break;
case TDLF:
/* this is not in the SUPDUP spec */
/* Move down one row vertically */
state = XS_DATA;
if (currline < (lines - 1))
currline++;
*nfrontp++ = TDMV0;
*nfrontp++ = currline;
*nfrontp++ = currcol;
break;
case TDUP:
state = XS_DATA;
if (currline > 0) currline--;
*nfrontp++ = TDMV0;
*nfrontp++ = currline;
*nfrontp++ = currcol;
break;
case TDILP:
case TDDLP:
case TDICP:
case TDDCP:
state = c;
piece_o_state = 0;
break;
case KLUDGE_ESCAPE:
/* Really shouldn't get two */
/* of these but it's happening */
break;
default:
state = XS_DATA;
*nfrontp++ = c;
break;
}
break;
/* The newline algorithm is as follows:
* A \r causes the cursor to be sent to the
* beginning of the line unless there is a \n
* immediately following on the input.
* If the next character is a \n then a
* %TDCRL is sent.
* A lone \n causes the cursor to be moved
* straight down one line wrapping if necessary
* or doing a %TDCRL if at the bottom of the screen
* and it is a scrolling terminal.
*
* The CR and NL handling is way too complicated...
*/
case XS_LFCR:
{
DPRINTF ("\n<<In XS_LFCR handler>>",0,0);
if (c == '\r')
do_crlf ();
else
{
/* Got a \012 followed by something other than a \015 */
/* Treat the \012 as `move down down one row */
if (currline < (lines - 1))
{
*nfrontp++ = TDMV0;
*nfrontp++ = ++currline;
*nfrontp++ = currcol;
}
else if (TOROL)
{
/* this is not the right thing, but
* what else can I do? */
currcol = 0;
*nfrontp++ = TDCRL;
}
else
{
currline = 0;
*nfrontp++ = TDMV0;
*nfrontp++ = 0;
*nfrontp++ = currcol;
*nfrontp++ = TDEOL;
}
ptyip--; pcc++; /* unread-char */
DPRINTF ("\n<<LFCR: unreading %c>>", *ptyip,0);
}
state = XS_DATA;
break;
}
case XS_CRLF:
{
DPRINTF ("\n<<In XS_CRLF handler>>",0,0);
if (c == '\n')
do_crlf ();
else
{
/* \013 followed by something other than \010 */
/* Treat the \010 as a request to move to start of row */
currcol = 0;
*nfrontp++ = TDMV0;
*nfrontp++ = currline;
*nfrontp++ = 0;
ptyip--; pcc++; /* unread-char */
DPRINTF ("\n<<CRLF: unreading %c>>", *ptyip,0);
}
state = XS_DATA;
break;
}
case XS_MV0_V:
case XS_MV0_H:
case TDILP:
case TDDLP:
case TDICP:
case TDDCP:
{
DPRINTF ("\n<<arg:%d+%c>>", piece_o_state, c);
if (c >= '0' && c <= '9')
{
piece_o_state = piece_o_state * 10 + c - '0';
if (piece_o_state >= lines && piece_o_state >= columns)
{
state = XS_DATA;
break;
}
}
else if (c != ';')
{
state = XS_DATA;
break;
}
else switch (state)
{
case XS_MV0_V:
piece_o_state_v = piece_o_state;
piece_o_state = 0;
state = XS_MV0_H;
break;
case XS_MV0_H:
currline = piece_o_state_v;
currcol = piece_o_state;
state = XS_DATA;
*nfrontp++ = TDMV0;
*nfrontp++ = currline;
*nfrontp++ = currcol;
break;
default: /* TDILP, TDDLP, RDICP, TDDCP */
while (pcc > 4 && (ptyip[0] & 0377) == KLUDGE_ESCAPE &&
(ptyip[1] & 0377) == state - 0176 &&
(ptyip[2] & 0377) == '1' &&
(ptyip[3] & 0377) == ';')
/* Merge successive single insert/delete-line/char requests
(pander to clients who don't understand TERMCAP
AL/DL (and less-importantly IC/DC) capabilities) */
{
piece_o_state++;
pcc -= 4;
ptyip += 4;
}
*nfrontp++ = state;
*nfrontp++ = piece_o_state;
if (state == TDILP || state == TDDLP)
{
/* Just to be on the safe side */
currcol = 0;
*nfrontp++ = TDMV0;
*nfrontp++ = currline;
*nfrontp++ = currcol;
}
state = XS_DATA;
break;
}
DPRINTF ("\n<<now:%d,%d>>", piece_o_state_v, piece_o_state);
break;
}
default:
state = XS_DATA;
break;
}
}
}
void do_crlf (void)
{
currcol = 0;
if (currline < (lines - 1))
{
*nfrontp++ = TDCRL;
currline++;
}
else if (TOROL)
*nfrontp++ = TDCRL;
else
{
currline = 0;
*nfrontp++ = TDMV0;
*nfrontp++ = 0;
*nfrontp++ = 0;
*nfrontp++ = TDEOL;
}
}
/*
* State for recv fsm
*/
/* base state */
#define RS_DATA 0
/* recieved ITP_ESCAPE (034) Waiting for `m' */
#define RS_ITP_ESCAPE 1
/* received ITP_ESCAPE, `m'>#o100
Waiting for `n'.
Char will be (+ (* (- `m' #o100) #o200) `n') */
#define RS_BUCKY 2
/* Recived ITP_ESCAPE, ITP_FLOW_CONTROL_INCREASE
Ignore next char, since un*x can't hack real, winning, flow control */
#define RS_FLOW_CONTROL_INCREASE 3
/* Recived ITP_ESCAPE, ITP_CURSORPOS
Waiting for `row' */
#define RS_CURSORPOS_1 4
/* Recived ITP_ESCAPE, ITP_CURSORPOS, `row'
Waiting for `column' */
#define RS_CURSORPOS_2 5
/* received SUPDUP_ESCAPE (#o300)
Waiting for `m' */
#define RS_SUPDUP_ESCAPE 6
/* received SUPDUP_ESCAPE, SUPDUP_LOCATION.
Now receiving 000-terminated
location string */
#define RS_LOCATION 7
void suprcv (void)
{
register int c;
static int state = RS_DATA;
static int piece_o_state = 69;
while ((ncc > 0) &&
/* Caller must flush pending output */
((&ptyobuf[BUFSIZ] - pfrontp) > 3))
{
c = *netip++ & 0377; ncc--;
switch (state)
{
case RS_DATA:
{
if (c == SUPDUP_ESCAPE)
state = RS_SUPDUP_ESCAPE;
else if (c == ITP_ESCAPE)
state = RS_ITP_ESCAPE;
else
*pfrontp++ = c;
break;
}
case RS_ITP_ESCAPE:
{
if (c & 0100)
{
piece_o_state = c;
state = RS_BUCKY;
}
else switch (c)
{
case ITP_ESCAPE:
*pfrontp++ = c;
state = RS_DATA;
break;
case ITP_PIATY:
/* %piaty --- user's screen is munged.
Cretinous unix provides no way to use this.
Conceivably we could send through a c-L character (barf!)
*/
case ITP_STOP_OUTPUT:
case ITP_RESTART_OUTPUT:
case ITP_FLOW_CONTROL_START:
case ITP_FLOW_CONTROL_END:
/* ignore it */
state = RS_DATA;
break;
case ITP_FLOW_CONTROL_INCREASE:
state = RS_FLOW_CONTROL_INCREASE;
break;
case ITP_CURSORPOS:
/* read cursorpos -- v then h */
state = RS_CURSORPOS_1;
break;
default: /* huh?! */
state = RS_DATA;
break;
}
break;
}
case RS_BUCKY:
{
register int bucky;
bucky = ITP_CHAR (piece_o_state, c);
/* unix supdup server uses 0237 (CTL_PREFIX) as a control escape.
* c-a 001
* m-a 341
* c-m-a 201
* c-1 237 061
* m-1 261
* c-m-1 237 261
* c-m-_ 237 237
*/
switch (bucky)
{
case SUPDUP_HELP_KEY:
c = 'h' & 037; /* hack for Help key */
break;
case SUPDUP_ESCAPE_KEY:
c = '\033';
break;
case SUPDUP_SUSPEND_KEY:
c = 'z' & 037;
break;
case SUPDUP_CLEAR_KEY:
c = -1;
break;
default:
c = bucky & 0177;
if (bucky & ITP_TOP)
c &= 037; /* This is pretty random -- Mly */
if (bucky & ITP_CTL)
{
if ((c >= 'a' && c <= 'z') ||
(c >= '@' && c <= 'Z') ||
(c >= '\\' && c <= '_'))
c &= 037;
else
*pfrontp++ = CTL_PREFIX;
}
if (bucky & ITP_MTA)
c |= 0200;
if (c == CTL_PREFIX)
/* Double control prefix to send 0237 (200 + ^_)
through pseudo-transparently */
*pfrontp++ = c;
}
if (c >= 0)
*pfrontp++ = c;