jmb@patton.sgi.com (Jim Barton) (08/04/89)
"screen" for the IRIS 4D series, Part 3/3
#--------------------------------CUT HERE-------------------------------------
#! /bin/sh
#
# This is a shell archive. Save this into a file, edit it
# and delete all lines above this comment. Then give this
# file to sh by executing the command "sh file". The files
# will be extracted into the current directory owned by
# you with default permissions.
#
# The files contained herein are:
#
# -r--r--r-- 1 jmb sys 43860 Aug 3 11:24 screen.c
# -r--r--r-- 1 jmb sys 2247 Aug 3 11:24 screen.h
# -r--r--r-- 1 jmb sys 633 Aug 3 11:24 screen.tic
#
echo 'x - screen.c'
if test -f screen.c; then echo 'shar: not overwriting screen.c'; else
sed 's/^X//' << '________This_Is_The_END________' > screen.c
X/* Copyright (c) 1987,1988 Oliver Laumann, Technical University of Berlin.
X * Not derived from licensed software.
X *
X * Permission is granted to freely use, copy, modify, and redistribute
X * this software, provided that no attempt is made to gain profit from it,
X * the author is not construed to be liable for any results of using the
X * software, alterations are clearly marked as such, and this notice is
X * not modified.
X */
X
Xstatic char ScreenVersion[] = "screen 2.0a 19-Oct-88 SGI 4D Series";
X
X#include <sys/types.h>
X#include <sys/time.h>
X#include <sys/file.h>
X#include <sys/wait.h>
X#include <sys/socket.h>
X# ifndef sgi
X#include <sys/un.h>
X# endif
X#include <sys/stat.h>
X#include <sys/dir.h>
X#ifdef SUNLOADAV
X#ifndef sgi
X#include <sys/param.h>
X#endif
X#endif
X#ifdef sgi
X#include <sys/sysmacros.h>
X#include <sys/utsname.h>
Xstatic char is3_3 = 0;
X#define setpgrp BSDsetpgrp
X#define getpgrp BSDgetpgrp
X#endif
X
X#include <stdio.h>
X#ifndef SYSV
X#include <sgtty.h>
X#endif
X#include <signal.h>
X#include <errno.h>
X#include <ctype.h>
X#include <utmp.h>
X#include <pwd.h>
X#include <nlist.h>
X#include <fcntl.h>
X#ifdef SYSV
X# include <termio.h>
X# include <string.h>
X#endif
X
X#include "screen.h"
X
X#ifndef SYSV
X#ifdef GETTTYENT
X# include <ttyent.h>
X#else
X static struct ttyent {
X char *ty_name;
X } *getttyent();
X static char *tt, *ttnext;
X static char ttys[] = "/etc/ttys";
X#endif
X#endif
X
X#define MAXWIN 10
X#define MSGWAIT 5
X
X#define Ctrl(c) ((c)&037)
X
Xextern char *blank, Term[], **environ;
Xextern rows, cols;
Xextern ISO2022;
Xextern status;
Xextern time_t TimeDisplayed;
Xextern char AnsiVersion[];
Xextern short ospeed;
Xextern flowctl;
Xextern errno;
Xextern sys_nerr;
Xextern char *sys_errlist[];
Xextern char *index(), *rindex(), *malloc(), *getenv(), *MakeTermcap();
Xextern char *getlogin(), *ttyname();
Xstatic AttacherFinit(), Finit(), SigHup(), SigChld();
Xstatic char *MakeBellMsg(), *Filename(), **SaveArgs(), *GetTtyName();
X
Xstatic char PtyName[32], TtyName[32];
Xstatic char *ShellProg;
Xstatic char *ShellArgs[2];
Xstatic char inbuf[IOSIZE];
Xstatic inlen;
Xstatic ESCseen;
Xstatic GotSignal;
Xstatic char DefaultShell[] = "/bin/sh";
Xstatic char DefaultPath[] = ":/usr/ucb:/bin:/usr/bin";
Xstatic char PtyProto[] = "/dev/ptyXY";
Xstatic char TtyProto[] = "/dev/ttyXY";
Xstatic int TtyMode = 0622;
Xstatic char SockPath[512];
Xstatic char SockDir[] = ".screen";
Xstatic char *SockNamePtr, *SockName;
Xstatic ServerSocket;
Xstatic char *NewEnv[MAXARGS];
Xstatic char Esc = Ctrl('a');
Xstatic char MetaEsc = 'a';
Xstatic char *home;
Xstatic HasWindow;
Xstatic utmp, utmpf;
Xstatic char UtmpName[] = "/etc/utmp";
Xstatic char *LoginName;
Xstatic char *BellString = "Bell in window %";
Xstatic mflag, nflag, fflag, rflag;
Xstatic char HostName[MAXSTR];
Xstatic Detached;
Xstatic AttacherPid; /* Non-Zero in child if we have an attacher */
Xstatic DevTty;
X#ifdef SYSV
Xstatic char proexec = 0;
Xstatic char chanopen = 0;
X#endif
X#ifdef LOADAV
X static char KmemName[] = "/dev/kmem";
X#ifdef sequent
X static char UnixName[] = "/dynix";
X#else
X#ifdef sgi
X static char UnixName[] = "/unix";
X#else
X static char UnixName[] = "/vmunix";
X#endif
X#endif
X#ifdef alliant
X static char AvenrunSym[] = "_Loadavg";
X#else
X#ifdef sgi
X static char AvenrunSym[] = "avenrun";
X#else
X static char AvenrunSym[] = "_avenrun";
X#endif
X#endif
X static struct nlist nl[2];
X static avenrun, kmemf;
X#ifdef SUNLOADAV
X long loadav[3];
X#else
X#ifdef alliant
X long loadav[4];
X#else
X double loadav[3];
X#endif
X#endif
X
X#ifdef sgi
X#ifndef FSCALE
X#define FSCALE 1000
X#endif
X#endif
X
X#endif
X
Xstruct mode {
X#ifdef SYSV
X struct termio m_tty;
X int m_oldpgrp;
X#else
X struct sgttyb m_ttyb;
X struct tchars m_tchars;
X struct ltchars m_ltchars;
X int m_ldisc;
X int m_lmode;
X#endif
X} OldMode, NewMode;
X
Xstatic struct win *curr, *other;
Xstatic CurrNum, OtherNum;
Xstatic struct win *wtab[MAXWIN];
X
X#define KEY_IGNORE 0
X#define KEY_HARDCOPY 1
X#define KEY_SUSPEND 2
X#define KEY_SHELL 3
X#define KEY_NEXT 4
X#define KEY_PREV 5
X#define KEY_KILL 6
X#define KEY_REDISPLAY 7
X#define KEY_WINDOWS 8
X#define KEY_VERSION 9
X#define KEY_OTHER 10
X#define KEY_0 11
X#define KEY_1 12
X#define KEY_2 13
X#define KEY_3 14
X#define KEY_4 15
X#define KEY_5 16
X#define KEY_6 17
X#define KEY_7 18
X#define KEY_8 19
X#define KEY_9 20
X#define KEY_XON 21
X#define KEY_XOFF 22
X#define KEY_INFO 23
X#define KEY_TERMCAP 24
X#define KEY_QUIT 25
X#define KEY_DETACH 26
X#define KEY_CREATE 27
X
Xstruct key {
X int type;
X char **args;
X} ktab[256];
X
Xchar *KeyNames[] = {
X "hardcopy", "suspend", "shell", "next", "prev", "kill", "redisplay",
X "windows", "version", "other", "select0", "select1", "select2", "select3",
X "select4", "select5", "select6", "select7", "select8", "select9",
X "xon", "xoff", "info", "termcap", "quit", "detach",
X 0
X};
X
Xmain (ac, av) char **av; {
X register n, len;
X register struct win **pp, *p;
X char *ap;
X int s, r, w, x = 0;
X int aflag = 0;
X struct timeval tv;
X time_t now;
X char buf[IOSIZE], *myname = (ac == 0) ? "screen" : av[0];
X char rc[256];
X struct stat st;
X
X while (ac > 0) {
X ap = *++av;
X if (--ac > 0 && *ap == '-') {
X switch (ap[1]) {
X case 'c': /* Compatibility with older versions. */
X break;
X case 'a':
X aflag = 1;
X break;
X case 'm':
X mflag = 1;
X break;
X case 'n':
X nflag = 1;
X break;
X case 'f':
X fflag = 1;
X break;
X case 'r':
X rflag = 1;
X if (ap[2]) {
X SockName = ap+2;
X if (ac != 1) goto help;
X } else if (--ac == 1) {
X SockName = *++av;
X } else if (ac != 0) goto help;
X break;
X case 'e':
X if (ap[2]) {
X ap += 2;
X } else {
X if (--ac == 0) goto help;
X ap = *++av;
X }
X if (strlen (ap) != 2)
X Msg (0, "Two characters are required with -e option.");
X Esc = ap[0];
X MetaEsc = ap[1];
X break;
X default:
X help:
X Msg (0, "Use: %s [-a] [-f] [-n] [-e xy] [cmd args]\n\
X or: %s -r [host.tty.pid]", myname, myname);
X }
X } else break;
X }
X if (nflag && fflag)
X Msg (0, "-f and -n are conflicting options.");
X if ((ShellProg = getenv ("SHELL")) == 0)
X ShellProg = DefaultShell;
X#ifdef SYSV
X#define MINUSMAX 32
X if (ac == 0) {
X char shbuf[MINUSMAX];
X char *s;
X
X if ((s = strrchr(ShellProg, '/')) == NULL) s = ShellProg; else s++;
X strcpy(shbuf, "-");
X if (strlen(s) + 2 > MINUSMAX)
X Msg(0, "Path to shell in SHELL variable is too long.");
X strcat(shbuf, s);
X ShellArgs[0] = shbuf;
X ac = 1;
X av = ShellArgs;
X proexec = 1;
X }
X#else
X ShellArgs[0] = ShellProg;
X if (ac == 0) {
X ac = 1;
X av = ShellArgs;
X }
X#endif
X if ((home = getenv ("HOME")) == 0)
X Msg (0, "$HOME is undefined.");
X#ifdef sgi
X {
X struct utsname ubuf;
X
X /*
X * Releases eariler than 3.3 don't handle
X * SIGCONT properly, so disable the facility.
X */
X uname(&ubuf);
X if (strncmp(ubuf.release, "4D1-", 4) == 0) {
X if (ubuf.release[4] >= '3' &&
X ubuf.release[6] >= '3')
X is3_3 = 1;
X }
X }
X#endif
X sprintf (SockPath, "%s/%s", home, SockDir);
X if (stat (SockPath, &st) == -1) {
X if (errno == ENOENT) {
X if (mkdir (SockPath, 0700) == -1)
X Msg (errno, "Cannot make directory %s", SockPath);
X (void) chown (SockPath, getuid (), getgid ());
X } else Msg (errno, "Cannot get status of %s", SockPath);
X } else {
X if ((st.st_mode & S_IFMT) != S_IFDIR)
X Msg (0, "%s is not a directory.", SockPath);
X if ((st.st_mode & 0777) != 0700)
X Msg (0, "Directory %s must have mode 700.", SockPath);
X if (st.st_uid != getuid ())
X Msg (0, "You are not the owner of %s.", SockPath);
X }
X (void) gethostname (HostName, MAXSTR);
X HostName[MAXSTR-1] = '\0';
X if (ap = index (HostName, '.'))
X *ap = '\0';
X strcat (SockPath, "/");
X SockNamePtr = SockPath + strlen (SockPath);
X if ((DevTty = open ("/dev/tty", O_RDWR|O_NDELAY)) == -1)
X Msg (errno, "/dev/tty");
X if (rflag) {
X Attach (MSG_ATTACH);
X Attacher ();
X /*NOTREACHED*/
X }
X if (GetSockName ()) {
X s = MakeClientSocket (1);
X SendCreateMsg (s, ac, av, aflag);
X close (s);
X exit (0);
X }
X switch (fork ()) {
X case -1:
X Msg (errno, "fork");
X /*NOTREACHED*/
X case 0:
X break;
X default:
X Attacher ();
X /*NOTREACHED*/
X }
X AttacherPid = getppid ();
X ServerSocket = s = MakeServerSocket ();
X InitTerm ();
X if (fflag)
X flowctl = 1;
X else if (nflag)
X flowctl = 0;
X MakeNewEnv ();
X GetTTY (0, &OldMode);
X#ifdef SYSV
X ospeed = (short)(OldMode.m_tty.c_cflag & CBAUD);
X#else
X ospeed = (short)OldMode.m_ttyb.sg_ospeed;
X#endif
X InitUtmp ();
X#ifdef LOADAV
X InitKmem ();
X#endif
X signal (SIGHUP, SigHup);
X signal (SIGINT, Finit);
X signal (SIGQUIT, Finit);
X signal (SIGTERM, Finit);
X signal (SIGTTIN, SIG_IGN);
X signal (SIGTTOU, SIG_IGN);
X InitKeytab ();
X sprintf (rc, "%.*s/.screenrc", 245, home);
X ReadRc (rc);
X#ifdef SYSV
X if ((n = MakeWindow ((proexec ? ShellProg : *av),
X av, aflag, 0, (char *)0)) == -1) {
X#else
X if ((n = MakeWindow (ShellProg, av, aflag, 0, (char *)0)) == -1) {
X#endif
X SetTTY (0, &OldMode);
X FinitTerm ();
X Kill (AttacherPid, SIGHUP);
X#ifdef SYSV
X if (chanopen)
X unlink(SockPath);
X#endif
X exit (1);
X }
X SetCurrWindow (n);
X HasWindow = 1;
X SetMode (&OldMode, &NewMode);
X SetTTY (0, &NewMode);
X signal (SIGCHLD, SigChld);
X tv.tv_usec = 0;
X while (1) {
X if (status) {
X time (&now);
X if (now - TimeDisplayed < MSGWAIT) {
X tv.tv_sec = MSGWAIT - (now - TimeDisplayed);
X } else RemoveStatus (curr);
X }
X r = 0;
X w = 0;
X if (inlen)
X w |= 1 << curr->ptyfd;
X else
X r |= 1 << 0;
X for (pp = wtab; pp < wtab+MAXWIN; ++pp) {
X if (!(p = *pp))
X continue;
X if ((*pp)->active && status)
X continue;
X if ((*pp)->outlen > 0)
X continue;
X r |= 1 << (*pp)->ptyfd;
X }
X r |= 1 << s;
X (void) fflush (stdout);
X if (GotSignal && !status) {
X SigHandler ();
X continue;
X }
X if (select (32, &r, &w, &x, status ? &tv : (struct timeval *)0) == -1) {
X if (errno == EINTR)
X continue;
X HasWindow = 0;
X Msg (errno, "select");
X /*NOTREACHED*/
X }
X if (GotSignal && !status) {
X SigHandler ();
X continue;
X }
X if (r & (1 << s)) {
X RemoveStatus (curr);
X ReceiveMsg (s);
X }
X if (r & (1 << 0)) {
X RemoveStatus (curr);
X if (ESCseen) {
X inbuf[0] = Esc;
X inlen = read (0, inbuf+1, IOSIZE-1) + 1;
X ESCseen = 0;
X } else {
X inlen = read (0, inbuf, IOSIZE);
X }
X if (inlen > 0)
X inlen = ProcessInput (inbuf, inlen);
X if (inlen > 0)
X continue;
X }
X if (GotSignal && !status) {
X SigHandler ();
X continue;
X }
X if (w & (1 << curr->ptyfd) && inlen > 0) {
X if ((len = write (curr->ptyfd, inbuf, inlen)) > 0) {
X inlen -= len;
X bcopy (inbuf+len, inbuf, inlen);
X }
X }
X if (GotSignal && !status) {
X SigHandler ();
X continue;
X }
X for (pp = wtab; pp < wtab+MAXWIN; ++pp) {
X if (!(p = *pp))
X continue;
X if (p->outlen) {
X WriteString (p, p->outbuf, p->outlen);
X } else if (r & 1 << p->ptyfd) {
X if ((len = read (p->ptyfd, buf, IOSIZE)) == -1) {
X if (errno == EWOULDBLOCK)
X len = 0;
X }
X if (len > 0)
X WriteString (p, buf, len);
X }
X if (p->bell) {
X p->bell = 0;
X Msg (0, MakeBellMsg (pp-wtab));
X }
X }
X if (GotSignal && !status)
X SigHandler ();
X }
X /*NOTREACHED*/
X}
X
Xstatic SigHandler () {
X while (GotSignal) {
X GotSignal = 0;
X DoWait ();
X }
X}
X
Xstatic SigChld () {
X GotSignal = 1;
X}
X
Xstatic SigHup () {
X Detach (0);
X}
X
Xstatic DoWait () {
X register pid;
X register struct win **pp;
X union wait wstat;
X
X while ((pid = wait3 (&wstat, WNOHANG|WUNTRACED, NULL)) > 0) {
X for (pp = wtab; pp < wtab+MAXWIN; ++pp) {
X if (*pp && pid == (*pp)->wpid) {
X if (WIFSTOPPED (wstat)) {
X (void) killpg (getpgrp ((*pp)->wpid), SIGCONT);
X } else {
X KillWindow (pp);
X }
X }
X }
X }
X#ifdef SYSV
X signal(SIGCHLD, SigChld);
X#endif
X CheckWindows ();
X}
X
Xstatic KillWindow (pp) struct win **pp; {
X if (*pp == curr)
X curr = 0;
X if (*pp == other)
X other = 0;
X FreeWindow (*pp);
X *pp = 0;
X}
X
Xstatic CheckWindows () {
X register struct win **pp;
X
X /* If the current window disappeared and the "other" window is still
X * there, switch to the "other" window, else switch to the window
X * with the lowest index.
X * If there current window is still there, but the "other" window
X * vanished, "SetCurrWindow" is called in order to assign a new value
X * to "other".
X * If no window is alive at all, exit.
X */
X if (!curr && other) {
X SwitchWindow (OtherNum);
X return;
X }
X if (curr && !other) {
X SetCurrWindow (CurrNum);
X return;
X }
X for (pp = wtab; pp < wtab+MAXWIN; ++pp) {
X if (*pp) {
X if (!curr)
X SwitchWindow (pp-wtab);
X return;
X }
X }
X Finit ();
X}
X
Xstatic Finit () {
X register struct win *p, **pp;
X
X for (pp = wtab; pp < wtab+MAXWIN; ++pp) {
X if (p = *pp)
X FreeWindow (p);
X }
X SetTTY (0, &OldMode);
X FinitTerm ();
X printf ("[screen is terminating]\n");
X Kill (AttacherPid, SIGHUP);
X#ifdef SYSV
X if (chanopen)
X unlink(SockPath);
X#endif
X exit (0);
X}
X
Xstatic InitKeytab () {
X register i;
X
X ktab['h'].type = ktab[Ctrl('h')].type = KEY_HARDCOPY;
X ktab['z'].type = ktab[Ctrl('z')].type = KEY_SUSPEND;
X ktab['c'].type = ktab[Ctrl('c')].type = KEY_SHELL;
X ktab[' '].type = ktab[Ctrl(' ')].type =
X ktab['n'].type = ktab[Ctrl('n')].type = KEY_NEXT;
X ktab['-'].type = ktab['p'].type = ktab[Ctrl('p')].type = KEY_PREV;
X ktab['k'].type = ktab[Ctrl('k')].type = KEY_KILL;
X ktab['l'].type = ktab[Ctrl('l')].type = KEY_REDISPLAY;
X ktab['w'].type = ktab[Ctrl('w')].type = KEY_WINDOWS;
X ktab['v'].type = ktab[Ctrl('v')].type = KEY_VERSION;
X ktab['q'].type = ktab[Ctrl('q')].type = KEY_XON;
X ktab['s'].type = ktab[Ctrl('s')].type = KEY_XOFF;
X ktab['t'].type = ktab[Ctrl('t')].type = KEY_INFO;
X ktab['.'].type = KEY_TERMCAP;
X ktab[Ctrl('\\')].type = KEY_QUIT;
X ktab['d'].type = ktab[Ctrl('d')].type = KEY_DETACH;
X ktab[Esc].type = KEY_OTHER;
X for (i = 0; i <= 9; i++)
X ktab[i+'0'].type = KEY_0+i;
X}
X
Xstatic ProcessInput (buf, len) char *buf; {
X register n, k;
X register char *s, *p;
X register struct win **pp;
X
X for (s = p = buf; len > 0; len--, s++) {
X if (*s == Esc) {
X if (len > 1) {
X len--; s++;
X k = ktab[*s].type;
X if (*s == MetaEsc) {
X *p++ = Esc;
X } else if (k >= KEY_0 && k <= KEY_9) {
X p = buf;
X SwitchWindow (k - KEY_0);
X } else switch (ktab[*s].type) {
X case KEY_TERMCAP:
X p = buf;
X WriteFile (0);
X break;
X case KEY_HARDCOPY:
X p = buf;
X WriteFile (1);
X break;
X case KEY_SUSPEND:
X#ifdef sgi
X if (!is3_3) {
X Msg(0,"Suspend not supported on this release");
X break;
X }
X#endif
X p = buf;
X Detach (1);
X break;
X case KEY_SHELL:
X p = buf;
X if ((n = MakeWindow (ShellProg, ShellArgs,
X 0, 0, (char *)0)) != -1)
X SwitchWindow (n);
X break;
X case KEY_NEXT:
X p = buf;
X if (MoreWindows ())
X SwitchWindow (NextWindow ());
X break;
X case KEY_PREV:
X p = buf;
X if (MoreWindows ())
X SwitchWindow (PreviousWindow ());
X break;
X case KEY_KILL:
X p = buf;
X FreeWindow (wtab[CurrNum]);
X if (other == curr)
X other = 0;
X curr = wtab[CurrNum] = 0;
X CheckWindows ();
X break;
X case KEY_QUIT:
X for (pp = wtab; pp < wtab+MAXWIN; ++pp)
X if (*pp) FreeWindow (*pp);
X Finit ();
X /*NOTREACHED*/
X case KEY_DETACH:
X p = buf;
X Detach (0);
X break;
X case KEY_REDISPLAY:
X p = buf;
X Activate (wtab[CurrNum]);
X break;
X case KEY_WINDOWS:
X p = buf;
X ShowWindows ();
X break;
X case KEY_VERSION:
X p = buf;
X Msg (0, "%s %s", ScreenVersion, AnsiVersion);
X break;
X case KEY_INFO:
X p = buf;
X ShowInfo ();
X break;
X case KEY_OTHER:
X p = buf;
X if (MoreWindows ())
X SwitchWindow (OtherNum);
X break;
X case KEY_XON:
X *p++ = Ctrl('q');
X break;
X case KEY_XOFF:
X *p++ = Ctrl('s');
X break;
X case KEY_CREATE:
X p = buf;
X if ((n = MakeWindow (ktab[*s].args[0], ktab[*s].args,
X 0, 0, (char *)0)) != -1)
X SwitchWindow (n);
X break;
X }
X } else ESCseen = 1;
X } else *p++ = *s;
X }
X return p - buf;
X}
X
Xstatic SwitchWindow (n) {
X if (!wtab[n])
X return;
X SetCurrWindow (n);
X Activate (wtab[n]);
X}
X
Xstatic SetCurrWindow (n) {
X /*
X * If we come from another window, this window becomes the
X * "other" window:
X */
X if (curr) {
X curr->active = 0;
X other = curr;
X OtherNum = CurrNum;
X }
X CurrNum = n;
X curr = wtab[n];
X curr->active = 1;
X /*
X * If the "other" window is currently undefined (at program start
X * or because it has died), or if the "other" window is equal to the
X * one just selected, we try to find a new one:
X */
X if (other == 0 || other == curr) {
X OtherNum = NextWindow ();
X other = wtab[OtherNum];
X }
X}
X
Xstatic NextWindow () {
X register struct win **pp;
X
X for (pp = wtab+CurrNum+1; pp != wtab+CurrNum; ++pp) {
X if (pp == wtab+MAXWIN)
X pp = wtab;
X if (*pp)
X break;
X }
X return pp-wtab;
X}
X
Xstatic PreviousWindow () {
X register struct win **pp;
X
X for (pp = wtab+CurrNum-1; pp != wtab+CurrNum; --pp) {
X if (pp < wtab)
X pp = wtab+MAXWIN-1;
X if (*pp)
X break;
X }
X return pp-wtab;
X}
X
Xstatic MoreWindows () {
X register struct win **pp;
X register n;
X
X for (n = 0, pp = wtab; pp < wtab+MAXWIN; ++pp)
X if (*pp) ++n;
X if (n <= 1)
X Msg (0, "No other window.");
X return n > 1;
X}
X
Xstatic FreeWindow (wp) struct win *wp; {
X register i;
X
X RemoveUtmp (wp->slot);
X (void) chmod (wp->tty, 0666);
X (void) chown (wp->tty, 0, 0);
X close (wp->ptyfd);
X for (i = 0; i < rows; ++i) {
X free (wp->image[i]);
X free (wp->attr[i]);
X free (wp->font[i]);
X }
X free (wp->image);
X free (wp->attr);
X free (wp->font);
X free (wp);
X}
X
Xstatic MakeWindow (prog, args, aflag, StartAt, dir)
X char *prog, **args, *dir; {
X register struct win **pp, *p;
X register char **cp;
X register n, f;
X int tf;
X int mypid;
X char ebuf[10];
X
X pp = wtab+StartAt;
X do {
X if (*pp == 0)
X break;
X if (++pp == wtab+MAXWIN)
X pp = wtab;
X } while (pp != wtab+StartAt);
X if (*pp) {
X Msg (0, "No more windows.");
X return -1;
X }
X n = pp - wtab;
X if ((f = OpenPTY ()) == -1) {
X Msg (0, "No more PTYs.");
X return -1;
X }
X (void) fcntl (f, F_SETFL, FNDELAY);
X if ((p = *pp = (struct win *)malloc (sizeof (struct win))) == 0) {
Xnomem:
X Msg (0, "Out of memory.");
X return -1;
X }
X if ((p->image = (char **)malloc (rows * sizeof (char *))) == 0)
X goto nomem;
X for (cp = p->image; cp < p->image+rows; ++cp) {
X if ((*cp = malloc (cols)) == 0)
X goto nomem;
X bclear (*cp, cols);
X }
X if ((p->attr = (char **)malloc (rows * sizeof (char *))) == 0)
X goto nomem;
X for (cp = p->attr; cp < p->attr+rows; ++cp) {
X if ((*cp = malloc (cols)) == 0)
X goto nomem;
X bzero (*cp, cols);
X }
X if ((p->font = (char **)malloc (rows * sizeof (char *))) == 0)
X goto nomem;
X for (cp = p->font; cp < p->font+rows; ++cp) {
X if ((*cp = malloc (cols)) == 0)
X goto nomem;
X bzero (*cp, cols);
X }
X if ((p->tabs = malloc (cols+1)) == 0) /* +1 because 0 <= x <= cols */
X goto nomem;
X ResetScreen (p);
X p->aflag = aflag;
X p->active = 0;
X p->bell = 0;
X p->outlen = 0;
X p->ptyfd = f;
X strncpy (p->cmd, Filename (args[0]), MAXSTR-1);
X p->cmd[MAXSTR-1] = '\0';
X strncpy (p->tty, TtyName, MAXSTR-1);
X (void) chown (TtyName, getuid (), getgid ());
X (void) chmod (TtyName, TtyMode);
X p->slot = SetUtmp (TtyName);
X switch (p->wpid = fork ()) {
X case -1:
X Msg (errno, "fork");
X free ((char *)p);
X return -1;
X case 0:
X signal (SIGHUP, SIG_DFL);
X signal (SIGINT, SIG_DFL);
X signal (SIGQUIT, SIG_DFL);
X signal (SIGTERM, SIG_DFL);
X signal (SIGTTIN, SIG_DFL);
X signal (SIGTTOU, SIG_DFL);
X setuid (getuid ());
X setgid (getgid ());
X if (dir && chdir (dir) == -1) {
X SendErrorMsg ("Cannot chdir to %s: %s", dir, sys_errlist[errno]);
X exit (1);
X }
X mypid = getpid ();
X ioctl (DevTty, TIOCNOTTY, (char *)0);
X if ((tf = open (TtyName, O_RDWR)) == -1) {
X SendErrorMsg ("Cannot open %s: %s", TtyName, sys_errlist[errno]);
X exit (1);
X }
X (void) dup2 (tf, 0);
X (void) dup2 (tf, 1);
X (void) dup2 (tf, 2);
X for (f = getdtablesize () - 1; f > 2; f--)
X close (f);
X ioctl (0, TIOCSPGRP, &mypid);
X (void) setpgrp (0, mypid);
X SetTTY (0, &OldMode);
X NewEnv[2] = MakeTermcap (aflag);
X sprintf (ebuf, "WINDOW=%d", n);
X NewEnv[3] = ebuf;
X execvpe (prog, args, NewEnv);
X SendErrorMsg ("Cannot exec %s: %s", prog, sys_errlist[errno]);
X exit (1);
X }
X return n;
X}
X
Xstatic execvpe (prog, args, env) char *prog, **args, **env; {
X register char *path, *p;
X char buf[1024];
X char *shargs[MAXARGS+1];
X register i, eaccess = 0;
X
X if (prog[0] == '/')
X path = "";
X else if ((path = getenv ("PATH")) == 0)
X path = DefaultPath;
X do {
X p = buf;
X while (*path && *path != ':')
X *p++ = *path++;
X if (p > buf)
X *p++ = '/';
X strcpy (p, prog);
X if (*path)
X ++path;
X execve (buf, args, env);
X switch (errno) {
X case ENOEXEC:
X shargs[0] = DefaultShell;
X shargs[1] = buf;
X for (i = 1; shargs[i+1] = args[i]; ++i)
X ;
X execve (DefaultShell, shargs, env);
X return;
X case EACCES:
X eaccess = 1;
X break;
X case ENOMEM: case E2BIG: case ETXTBSY:
X return;
X }
X } while (*path);
X if (eaccess)
X errno = EACCES;
X}
X
Xstatic WriteFile (dump) { /* dump==0: create .termcap, dump==1: hardcopy */
X register i, j, k;
X register char *p;
X register FILE *f;
X char fn[1024];
X int pid, s;
X
X if (dump)
X sprintf (fn, "hardcopy.%d", CurrNum);
X else
X sprintf (fn, "%s/%s/.termcap", home, SockDir);
X switch (pid = fork ()) {
X case -1:
X Msg (errno, "fork");
X return;
X case 0:
X setuid (getuid ());
X setgid (getgid ());
X if ((f = fopen (fn, "w")) == NULL)
X exit (1);
X if (dump) {
X for (i = 0; i < rows; ++i) {
X p = curr->image[i];
X for (k = cols-1; k >= 0 && p[k] == ' '; --k) ;
X for (j = 0; j <= k; ++j)
X putc (p[j], f);
X putc ('\n', f);
X }
X } else {
X if (p = index (MakeTermcap (curr->aflag), '=')) {
X fputs (++p, f);
X putc ('\n', f);
X }
X }
X (void) fclose (f);
X exit (0);
X default:
X while ((i = wait (&s)) != pid)
X if (i == -1) return;
X if ((s >> 8) & 0377)
X Msg (0, "Cannot open \"%s\".", fn);
X else
X Msg (0, "%s written to \"%s\".", dump ? "Screen image" :
X "Termcap entry", fn);
X }
X}
X
Xstatic ShowWindows () {
X char buf[1024];
X register char *s;
X register struct win **pp, *p;
X
X for (s = buf, pp = wtab; pp < wtab+MAXWIN; ++pp) {
X if ((p = *pp) == 0)
X continue;
X if (s - buf + 5 + strlen (p->cmd) > cols-1)
X break;
X if (s > buf) {
X *s++ = ' '; *s++ = ' ';
X }
X *s++ = pp - wtab + '0';
X if (p == curr)
X *s++ = '*';
X else if (p == other)
X *s++ = '-';
X *s++ = ' ';
X strcpy (s, p->cmd);
X s += strlen (s);
X }
X Msg (0, buf);
X}
X
Xstatic ShowInfo () {
X char buf[1024], *p;
X register struct win *wp = curr;
X register i;
X struct tm *tp;
X time_t now;
X
X time (&now);
X tp = localtime (&now);
X sprintf (buf, "%2d:%02.2d:%02.2d %s", tp->tm_hour, tp->tm_min, tp->tm_sec,
X HostName);
X#ifdef LOADAV
X if (avenrun && GetAvenrun ()) {
X p = buf + strlen (buf);
X#ifdef SUNLOADAV
X sprintf (p, " %2.2f %2.2f %2.2f", (double)loadav[0]/FSCALE,
X (double)loadav[1]/FSCALE, (double)loadav[2]/FSCALE);
X#else
X#ifdef alliant
X sprintf (p, " %2.2f %2.2f %2.2f %2.2f", (double)loadav[0]/100,
X (double)loadav[1]/100, (double)loadav[2]/100,
X (double)loadav[3]/100);
X#else
X sprintf (p, " %2.2f %2.2f %2.2f", loadav[0], loadav[1], loadav[2]);
X#endif
X#endif
X }
X#endif
X p = buf + strlen (buf);
X sprintf (p, " (%d,%d) %cflow %cins %corg %cwrap %cpad", wp->y, wp->x,
X flowctl ? '+' : '-',
X wp->insert ? '+' : '-', wp->origin ? '+' : '-',
X wp->wrap ? '+' : '-', wp->keypad ? '+' : '-');
X if (ISO2022) {
X p = buf + strlen (buf);
X sprintf (p, " G%1d [", wp->LocalCharset);
X for (i = 0; i < 4; i++)
X p[i+5] = wp->charsets[i] ? wp->charsets[i] : 'B';
X p[9] = ']';
X p[10] = '\0';
X }
X Msg (0, buf);
X}
X
X#ifdef sgi
Xstatic int
XOpenPTY()
X{
X int fd;
X int pnum;
X struct stat sb;
X
X fd = open("/dev/ptc", O_RDWR|O_NDELAY);
X if (fd >= 0) {
X if (fstat(fd, &sb) < 0) {
X close(fd);
X return -1;
X }
X pnum = minor(sb.st_rdev);
X sprintf(TtyName, "/dev/ttyq%d", pnum);
X }
X return fd;
X}
X#else
Xstatic OpenPTY () {
X register char *p, *l, *d;
X register i, f, tf;
X
X strcpy (PtyName, PtyProto);
X strcpy (TtyName, TtyProto);
X for (p = PtyName, i = 0; *p != 'X'; ++p, ++i) ;
X for (l = "qpr"; *p = *l; ++l) {
X for (d = "0123456789abcdef"; p[1] = *d; ++d) {
X if ((f = open (PtyName, O_RDWR)) != -1) {
X TtyName[i] = p[0];
X TtyName[i+1] = p[1];
X if ((tf = open (TtyName, O_RDWR)) != -1) {
X close (tf);
X return f;
X }
X close (f);
X }
X }
X }
X return -1;
X}
X#endif
X
Xstatic SetTTY (fd, mp) struct mode *mp; {
X#ifdef SYSV
X ioctl (fd, TCSETA, &mp->m_tty);
X#else
X ioctl (fd, TIOCSETP, &mp->m_ttyb);
X ioctl (fd, TIOCSETC, &mp->m_tchars);
X ioctl (fd, TIOCSLTC, &mp->m_ltchars);
X ioctl (fd, TIOCLSET, &mp->m_lmode);
X ioctl (fd, TIOCSETD, &mp->m_ldisc);
X#endif
X}
X
Xstatic GetTTY (fd, mp) struct mode *mp; {
X#ifdef SYSV
X ioctl (fd, TCGETA, &mp->m_tty);
X#else
X ioctl (fd, TIOCGETP, &mp->m_ttyb);
X ioctl (fd, TIOCGETC, &mp->m_tchars);
X ioctl (fd, TIOCGLTC, &mp->m_ltchars);
X ioctl (fd, TIOCLGET, &mp->m_lmode);
X ioctl (fd, TIOCGETD, &mp->m_ldisc);
X#endif
X}
X
Xstatic SetMode (op, np) struct mode *op, *np; {
X *np = *op;
X#ifdef SYSV
X np->m_tty.c_lflag = 0;
X np->m_tty.c_iflag = IGNBRK;
X np->m_tty.c_oflag = 0;
X if (flowctl)
X np->m_tty.c_iflag |= IXON|IXOFF;
X np->m_tty.c_cc[VMIN] = 1;
X np->m_tty.c_cc[VTIME] = 0;
X#else
X np->m_ttyb.sg_flags &= ~(CRMOD|ECHO);
X np->m_ttyb.sg_flags |= CBREAK;
X np->m_tchars.t_intrc = -1;
X np->m_tchars.t_quitc = -1;
X if (!flowctl) {
X np->m_tchars.t_startc = -1;
X np->m_tchars.t_stopc = -1;
X }
X np->m_ltchars.t_suspc = -1;
X np->m_ltchars.t_dsuspc = -1;
X np->m_ltchars.t_flushc = -1;
X np->m_ltchars.t_lnextc = -1;
X#endif
X}
X
Xstatic char *GetTtyName () {
X register char *p;
X register n;
X
X for (p = 0, n = 0; n <= 2 && !(p = ttyname (n)); n++)
X ;
X if (!p || *p == '\0')
X Msg (0, "screen must run on a tty.");
X return p;
X}
X
Xstatic ScreenInUse () {
X Msg (0, "The screen is already attached elsewhere.");
X}
X
Xstatic Attach (how) {
X register s, lasts, found = 0;
X register DIR *dirp;
X register struct direct *dp;
X struct msg m;
X char last[MAXNAMLEN+1];
X
X if (SockName) {
X if ((lasts = MakeClientSocket (0)) == -1)
X if (how == MSG_CONT)
X Msg (0,
X "This screen has already been continued from elsewhere.");
X else
X Msg (0, "There is no screen to be resumed from %s", SockName);
X } else {
X if ((dirp = opendir (SockPath)) == NULL)
X Msg (0, "Cannot open %s", SockPath);
X while ((dp = readdir (dirp)) != NULL) {
X SockName = dp->d_name;
X if (SockName[0] == '.')
X continue;
X if ((s = MakeClientSocket (0)) != -1) {
X if (found == 0) {
X strcpy (last, SockName);
X lasts = s;
X } else {
X if (found == 1) {
X printf ("There are detached screens on:\n");
X printf (" %s\n", last);
X close (lasts);
X }
X printf (" %s\n", SockName);
X close (s);
X#ifdef SYSV
X chanopen = 0;
X#endif
X }
X found++;
X }
X }
X if (found == 0)
X Msg (0, "There is no screen to be resumed.");
X if (found > 1)
X#ifdef SYSV
X Msg (0, "Type \"screen -r host.tty.pid\" to resume one of them.");
X#else
X Msg (0, "Type \"screen -r host.tty\" to resume one of them.");
X#endif
X closedir (dirp);
X strcpy (SockNamePtr, last);
X SockName = SockNamePtr;
X }
X m.type = how;
X strcpy (m.m.attach.tty, GetTtyName ());
X m.m.attach.apid = getpid ();
X /*
X * Don't overlook the fact that we could get SIGHUP as a result
X * of this call, if we attempt to attach to a window which is
X * not detached. If we do, issue a meaningful message.
X */
X signal(SIGHUP, ScreenInUse);
X if (write (lasts, (char *)&m, sizeof (m)) != sizeof (m))
X Msg (errno, "write");
X}
X
Xstatic AttacherFinit () {
X exit (0);
X}
X
Xstatic ReAttach () {
X Attach (MSG_CONT);
X#ifdef SYSV
X signal(SIGCONT, ReAttach);
X#endif
X}
X
Xstatic Attacher () {
X signal (SIGHUP, AttacherFinit);
X signal (SIGCONT, ReAttach);
X while (1)
X pause ();
X}
X
Xstatic Detach (suspend) {
X register struct win **pp;
X
X if (Detached)
X return;
X signal (SIGHUP, SIG_IGN);
X SetTTY (0, &OldMode);
X FinitTerm ();
X if (suspend) {
X Kill (AttacherPid, SIGTSTP);
X } else {
X for (pp = wtab; pp < wtab+MAXWIN; ++pp)
X if (*pp) RemoveUtmp ((*pp)->slot);
X printf ("\n[detached]\n");
X Kill (AttacherPid, SIGHUP);
X AttacherPid = 0;
X }
X close (0);
X close (1);
X close (2);
X ioctl (DevTty, TIOCNOTTY, (char *)0);
X Detached = 1;
X do {
X ReceiveMsg (ServerSocket);
X } while (Detached);
X if (!suspend)
X for (pp = wtab; pp < wtab+MAXWIN; ++pp)
X if (*pp) (*pp)->slot = SetUtmp ((*pp)->tty);
X signal (SIGHUP, SigHup);
X}
X
Xstatic Kill (pid, sig) {
X if (pid != 0)
X (void) kill (pid, sig);
X}
X
Xstatic GetSockName () {
X register client;
X static char buf[3*MAXSTR];
X
X if (!mflag && (SockName = getenv ("STY")) != 0 && *SockName != '\0') {
X client = 1;
X setuid (getuid ());
X setgid (getgid ());
X } else {
X#ifdef SYSV
X sprintf (buf, "%s.%s.%d", HostName, Filename (GetTtyName ()),
X getpid());
X#else
X sprintf (buf, "%s.%s", HostName, Filename (GetTtyName ()));
X#endif
X SockName = buf;
X client = 0;
X }
X return client;
X}
X
Xstatic MakeServerSocket () {
X register s;
X#ifndef SYSV
X struct sockaddr_un a;
X#endif
X char *p;
X
X#ifdef SYSV
X int oflags;
X
X strcpy (SockNamePtr, SockName);
X if (access(SockPath, 06) != -1) {
X p = Filename (SockPath);
X Msg (0, "You have already a screen running on %s.\n\
XIf it has been detached, try \"screen -r\".", p);
X /*NOTREACHED*/
X }
X if (mknod(SockPath, 010600) == -1)
X Msg (errno, "named pipe");
X if ((s = open(SockPath, O_RDWR)) == -1)
X Msg (errno, "named pipe open");
X chanopen = 1;
X (void) chown (SockPath, getuid (), getgid ());
X return(s);
X#else
X if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) == -1)
X Msg (errno, "socket");
X a.sun_family = AF_UNIX;
X strcpy (SockNamePtr, SockName);
X strcpy (a.sun_path, SockPath);
X if (connect (s, (struct sockaddr *)&a, strlen (SockPath)+2) != -1) {
X p = Filename (SockPath);
X Msg (0, "You have already a screen running on %s.\n\
XIf it has been detached, try \"screen -r\".", p);
X /*NOTREACHED*/
X }
X if (bind (s, (struct sockaddr *)&a, strlen (SockPath)+2) == -1)
X Msg (errno, "bind");
X (void) chown (SockPath, getuid (), getgid ());
X if (listen (s, 5) == -1)
X Msg (errno, "listen");
X return s;
X#endif
X}
X
Xstatic MakeClientSocket (err) {
X register s;
X#ifndef SYSV
X struct sockaddr_un a;
X#endif
X
X#ifdef SYSV
X int oflags;
X
X strcpy (SockNamePtr, SockName);
X if ((s = open(SockPath, O_WRONLY|O_NDELAY)) == -1) {
X if (err) {
X Msg (errno, "connect: %s", SockPath);
X } else {
X close (s);
X return -1;
X }
X }
X chanopen = 1;
X (void) chown (SockPath, getuid (), getgid ());
X oflags = fcntl(s, F_GETFL);
X oflags &= ~O_NDELAY;
X fcntl(s, F_SETFL, oflags);
X#else
X if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) == -1)
X Msg (errno, "socket");
X a.sun_family = AF_UNIX;
X strcpy (SockNamePtr, SockName);
X strcpy (a.sun_path, SockPath);
X if (connect (s, (struct sockaddr *)&a, strlen (SockPath)+2) == -1) {
X if (err) {
X Msg (errno, "connect: %s", SockPath);
X } else {
X close (s);
X return -1;
X }
X }
X#endif
X return s;
X}
X
Xstatic SendCreateMsg (s, ac, av, aflag) char **av; {
X struct msg m;
X register char *p;
X register len, n;
X
X m.type = MSG_CREATE;
X p = m.m.create.line;
X#ifdef SYSV
X if (proexec)
X strcpy(p, ShellProg);
X else
X strcpy(p, *av);
X p = p + strlen(p) + 1;
X#endif
X for (n = 0; ac > 0 && n < MAXARGS-1; ++av, --ac, ++n) {
X len = strlen (*av) + 1;
X if (p + len >= m.m.create.line+MAXLINE)
X break;
X strcpy (p, *av);
X p += len;
X }
X m.m.create.nargs = n;
X m.m.create.aflag = aflag;
X if (getwd (m.m.create.dir) == 0)
X Msg (0, "%s", m.m.create.dir);
X if (write (s, (char *)&m, sizeof (m)) != sizeof (m))
X Msg (errno, "write");
X}
X
X/*VARARGS1*/
Xstatic SendErrorMsg (fmt, p1, p2, p3, p4, p5, p6) char *fmt; {
X register s;
X struct msg m;
X
X s = MakeClientSocket (1);
X m.type = MSG_ERROR;
X sprintf (m.m.message, fmt, p1, p2, p3, p4, p5, p6);
X (void) write (s, (char *)&m, sizeof (m));
X close (s);
X sleep (2);
X}
X
Xstatic ReceiveMsg (s) {
X#ifndef SYSV
X register ns;
X struct sockaddr_un a;
X int left, len = sizeof (a);
X#else
X int left, len;
X#endif
X struct msg m;
X char *p;
X
X#ifndef SYSV
X if ((ns = accept (s, (struct sockaddr *)&a, &len)) == -1) {
X Msg (errno, "accept");
X return;
X }
X p = (char *)&m;
X left = sizeof (m);
X while (left > 0 && (len = read (ns, p, left)) > 0) {
X p += len;
X left -= len;
X }
X close (ns);
X#else
X p = (char *)&m;
X len = read (s, p, sizeof(m));
X left = sizeof(m) - len;
X#endif
X if (len == -1)
X Msg (errno, "read");
X if (left > 0)
X return;
X switch (m.type) {
X case MSG_CREATE:
X if (!Detached)
X ExecCreate (&m);
X break;
X case MSG_CONT:
X if (m.m.attach.apid != AttacherPid || !Detached)
X break; /* Intruder Alert */
X /*FALLTHROUGH*/
X case MSG_ATTACH:
X if (Detached) {
X if (kill (m.m.attach.apid, 0) == 0 &&
X open (m.m.attach.tty, O_RDWR) == 0) {
X (void) dup (0);
X (void) dup (0);
X AttacherPid = m.m.attach.apid;
X Detached = 0;
X GetTTY (0, &OldMode);
X SetMode (&OldMode, &NewMode);
X SetTTY (0, &NewMode);
X Activate (wtab[CurrNum]);
X }
X } else {
X Kill (m.m.attach.apid, SIGHUP);
X Msg (0, "Not detached.");
X }
X break;
X case MSG_ERROR:
X Msg (0, "%s", m.m.message);
X break;
X default:
X Msg (0, "Invalid message (type %d).", m.type);
X }
X}
X
Xstatic ExecCreate (mp) struct msg *mp; {
X char *args[MAXARGS];
X register n;
X register char **pp = args, *p = mp->m.create.line;
X
X#ifdef SYSV
X char *xprog;
X
X xprog = p;
X p += strlen(p) + 1;
X#endif
X for (n = mp->m.create.nargs; n > 0; --n) {
X *pp++ = p;
X p += strlen (p) + 1;
X }
X *pp = 0;
X#ifdef SYSV
X if ((n = MakeWindow (xprog, args, mp->m.create.aflag, 0,
X#else
X if ((n = MakeWindow (mp->m.create.line, args, mp->m.create.aflag, 0,
X#endif
X mp->m.create.dir)) != -1)
X SwitchWindow (n);
X}
X
Xstatic ReadRc (fn) char *fn; {
X FILE *f;
X register char *p, **pp, **ap;
X register argc, num, c;
X char buf[256];
X char *args[MAXARGS];
X int key;
X
X ap = args;
X if (access (fn, R_OK) == -1)
X return;
X if ((f = fopen (fn, "r")) == NULL)
X return;
X while (fgets (buf, 256, f) != NULL) {
X if (p = rindex (buf, '\n'))
X *p = '\0';
X if ((argc = Parse (fn, buf, ap)) == 0)
X continue;
X if (strcmp (ap[0], "escape") == 0) {
X p = ap[1];
X if (argc < 2 || strlen (p) != 2)
X Msg (0, "%s: two characters required after escape.", fn);
X Esc = *p++;
X MetaEsc = *p;
X } else if (strcmp (ap[0], "chdir") == 0) {
X p = argc < 2 ? home : ap[1];
X if (chdir (p) == -1)
X Msg (errno, "%s", p);
X } else if (strcmp (ap[0], "mode") == 0) {
X if (argc != 2) {
X Msg (0, "%s: mode: one argument required.", fn);
X } else if (!IsNum (ap[1], 7)) {
X Msg (0, "%s: mode: octal number expected.", fn);
X } else (void) sscanf (ap[1], "%o", &TtyMode);
X } else if (strcmp (ap[0], "bell") == 0) {
X if (argc != 2) {
X Msg (0, "%s: bell: one argument required.", fn);
X } else {
X if ((BellString = malloc (strlen (ap[1]) + 1)) == 0)
X Msg (0, "Out of memory.");
X strcpy (BellString, ap[1]);
X }
X } else if (strcmp (ap[0], "screen") == 0) {
X num = 0;
X if (argc > 1 && IsNum (ap[1], 10)) {
X num = atoi (ap[1]);
X if (num < 0 || num > MAXWIN-1)
X Msg (0, "%s: illegal screen number %d.", fn, num);
X --argc; ++ap;
X }
X if (argc < 2) {
X ap[1] = ShellProg; argc = 2;
X }
X ap[argc] = 0;
X (void) MakeWindow (ap[1], ap+1, 0, num, (char *)0);
X } else if (strcmp (ap[0], "bind") == 0) {
X p = ap[1];
X if (argc < 2 || *p == '\0')
X Msg (0, "%s: key expected after bind.", fn);
X if (p[1] == '\0') {
X key = *p;
X } else if (p[0] == '^' && p[1] != '\0' && p[2] == '\0') {
X c = p[1];
X if (isupper (c))
X p[1] = tolower (c);
X key = Ctrl(c);
X } else if (IsNum (p, 7)) {
X (void) sscanf (p, "%o", &key);
X } else {
X Msg (0,
X "%s: bind: character, ^x, or octal number expected.", fn);
X }
X if (argc < 3) {
X ktab[key].type = 0;
X } else {
X for (pp = KeyNames; *pp; ++pp)
X if (strcmp (ap[2], *pp) == 0) break;
X if (*pp) {
X ktab[key].type = pp-KeyNames+1;
X } else {
X ktab[key].type = KEY_CREATE;
X ktab[key].args = SaveArgs (argc-2, ap+2);
X }
X }
X } else Msg (0, "%s: unknown keyword \"%s\".", fn, ap[0]);
X }
X (void) fclose (f);
X}
X
Xstatic Parse (fn, buf, args) char *fn, *buf, **args; {
X register char *p = buf, **ap = args;
X register delim, argc = 0;
X
X argc = 0;
X for (;;) {
X while (*p && (*p == ' ' || *p == '\t')) ++p;
X if (*p == '\0' || *p == '#')
X return argc;
X if (argc > MAXARGS-1)
X Msg (0, "%s: too many tokens.", fn);
X delim = 0;
X if (*p == '"' || *p == '\'') {
X delim = *p; *p = '\0'; ++p;
X }
X ++argc;
X *ap = p; ++ap;
X while (*p && !(delim ? *p == delim : (*p == ' ' || *p == '\t')))
X ++p;
X if (*p == '\0') {
X if (delim)
X Msg (0, "%s: Missing quote.", fn);
X else
X return argc;
X }
X *p++ = '\0';
X }
X}
X
Xstatic char **SaveArgs (argc, argv) register argc; register char **argv; {
X register char **ap, **pp;
X
X if ((pp = ap = (char **)malloc ((argc+1) * sizeof (char **))) == 0)
X Msg (0, "Out of memory.");
X while (argc--) {
X if ((*pp = malloc (strlen (*argv)+1)) == 0)
X Msg (0, "Out of memory.");
X strcpy (*pp, *argv);
X ++pp; ++argv;
X }
X *pp = 0;
X return ap;
X}
X
Xstatic MakeNewEnv () {
X register char **op, **np = NewEnv;
X static char buf[MAXSTR];
X char envbuf[MAXSTR];
X
X if (strlen (SockName) > MAXSTR-5)
X SockName = "?";
X sprintf (buf, "STY=%s", SockName);
X *np++ = buf;
X *np++ = Term;
X np += 2;
X#ifdef SYSV
X sprintf(envbuf, "LINES=%d", rows);
X *np++ = strdup(envbuf);
X sprintf(envbuf, "COLS=%d", cols);
X *np++ = strdup(envbuf);
X#endif
X for (op = environ; *op; ++op) {
X if (np == NewEnv + MAXARGS - 1)
X break;
X if (!IsSymbol (*op, "TERM") && !IsSymbol (*op, "TERMCAP")
X && !IsSymbol (*op, "STY"))
X *np++ = *op;
X }
X *np = 0;
X}
X
Xstatic IsSymbol (e, s) register char *e, *s; {
X register char *p;
X register n;
X
X for (p = e; *p && *p != '='; ++p) ;
X if (*p) {
X *p = '\0';
X n = strcmp (e, s);
X *p = '=';
X return n == 0;
X }
X return 0;
X}
X
X/*VARARGS2*/
XMsg (err, fmt, p1, p2, p3, p4, p5, p6) char *fmt; {
X char buf[1024];
X register char *p = buf;
X
X if (Detached)
X return;
X sprintf (p, fmt, p1, p2, p3, p4, p5, p6);
X if (err) {
X p += strlen (p);
X if (err > 0 && err < sys_nerr)
X sprintf (p, ": %s", sys_errlist[err]);
X else
X sprintf (p, ": Error %d", err);
X }
X if (HasWindow) {
X MakeStatus (buf, curr);
X } else {
X printf ("%s\r\n", buf);
X Kill (AttacherPid, SIGHUP);
X#ifdef SYSV
X if (chanopen && AttacherPid)
X unlink(SockPath);
X#endif
X exit (1);
X }
X}
X
Xbclear (p, n) char *p; {
X bcopy (blank, p, n);
X}
X
Xstatic char *Filename (s) char *s; {
X register char *p;
X
X p = s + strlen (s) - 1;
X while (p >= s && *p != '/') --p;
X return ++p;
X}
X
Xstatic IsNum (s, base) register char *s; register base; {
X for (base += '0'; *s; ++s)
X if (*s < '0' || *s > base)
X return 0;
X return 1;
X}
X
Xstatic char *MakeBellMsg (n) {
X static char buf[MAXSTR];
X register char *p = buf, *s = BellString;
X
X for (s = BellString; *s && p < buf+MAXSTR-1; s++)
X *p++ = (*s == '%') ? n + '0' : *s;
X *p = '\0';
X return buf;
X}
X
Xstatic InitUtmp () {
X struct passwd *p;
X
X#ifdef SYSV
X if (setutent() == NULL)
X return;
X#else
X if ((utmpf = open (UtmpName, O_WRONLY)) == -1) {
X if (errno != EACCES)
X Msg (errno, UtmpName);
X return;
X }
X#endif
X if ((LoginName = getlogin ()) == 0 || LoginName[0] == '\0') {
X if ((p = getpwuid (getuid ())) == 0)
X return;
X LoginName = p->pw_name;
X }
X utmp = 1;
X}
X
Xstatic SetUtmp (name) char *name; {
X register char *p;
X register struct ttyent *tp;
X register slot = 1;
X struct utmp u;
X
X if (!utmp)
X return 0;
X if (p = rindex (name, '/'))
X ++p;
X else p = name;
X#ifndef SYSV
X setttyent ();
X while ((tp = getttyent ()) != NULL && strcmp (p, tp->ty_name) != 0)
X ++slot;
X if (tp == NULL)
X return 0;
X strncpy (u.ut_line, p, 8);
X time (&u.ut_time);
X strncpy (u.ut_name, LoginName, 8);
X u.ut_host[0] = '\0';
X (void) lseek (utmpf, (long)(slot * sizeof (u)), 0);
X (void) write (utmpf, (char *)&u, sizeof (u));
X return slot;
X#else
X {
X int len = strlen(p);
X
X setutent();
X bzero((char *) &u, sizeof(u));
X strncpy(u.ut_line, p, 8);
X u.ut_type = USER_PROCESS;
X strncpy (u.ut_name, LoginName, 8);
X u.ut_id[0] = 's'; u.ut_id[3] = '\0';
X u.ut_id[1] = p[len - 2]; u.ut_id[2] = p[len - 1];
X slot = *((int *) u.ut_id);
X time (&u.ut_time);
X pututline(&u);
X return slot;
X }
X#endif
X}
X
Xstatic RemoveUtmp (slot) int slot; {
X struct utmp u;
X
X if (slot) {
X#ifdef SYSV
X struct utmp *y;
X
X setutent();
X bzero((char *) &u, sizeof(u));
X *((int *) u.ut_id) = slot;
X u.ut_type = USER_PROCESS;
X if ((y = getutid(&u)) == 0)
X return;
X strncpy (u.ut_name, "screen", 8);
X strncpy (u.ut_line, y->ut_line, 12);
X u.ut_type = DEAD_PROCESS;
X time (&u.ut_time);
X pututline(&u);
X#else
X bzero ((char *)&u, sizeof (u));
X (void) lseek (utmpf, (long)(slot * sizeof (u)), 0);
X (void) write (utmpf, (char *)&u, sizeof (u));
X#endif
X }
X}
X
X#ifndef SYSV
X#ifndef GETTTYENT
X
Xstatic setttyent () {
X struct stat s;
X register f;
X register char *p, *ep;
X
X if (ttnext) {
X ttnext = tt;
X return;
X }
X if ((f = open (ttys, O_RDONLY)) == -1 || fstat (f, &s) == -1)
X Msg (errno, ttys);
X if ((tt = malloc (s.st_size + 1)) == 0)
X Msg (0, "Out of memory.");
X if (read (f, tt, s.st_size) != s.st_size)
X Msg (errno, ttys);
X close (f);
X for (p = tt, ep = p + s.st_size; p < ep; ++p)
X if (*p == '\n') *p = '\0';
X *p = '\0';
X ttnext = tt;
X}
X
Xstatic struct ttyent *getttyent () {
X static struct ttyent t;
X
X if (*ttnext == '\0')
X return NULL;
X t.ty_name = ttnext + 2;
X ttnext += strlen (ttnext) + 1;
X return &t;
X}
X
X#endif
X#endif
X
X#ifdef LOADAV
X
Xstatic InitKmem () {
X if ((kmemf = open (KmemName, O_RDONLY)) == -1)
X return;
X nl[0].n_name = AvenrunSym;
X nlist (UnixName, nl);
X if (nl[0].n_type == 0 || nl[0].n_value == 0)
X return;
X avenrun = 1;
X}
X
Xstatic GetAvenrun () {
X if (lseek (kmemf, nl[0].n_value & ~0x80000000, 0) == -1)
X return 0;
X if (read (kmemf, loadav, sizeof (loadav)) != sizeof (loadav))
X return 0;
X return 1;
X}
X
X#endif
X
X#ifndef USEBCOPY
Xbcopy (s1, s2, len) register char *s1, *s2; register len; {
X if (s1 < s2 && s2 < s1 + len) {
X s1 += len; s2 += len;
X while (len-- > 0) {
X *--s2 = *--s1;
X }
X } else {
X while (len-- > 0) {
X *s2++ = *s1++;
X }
X }
X}
X#endif
X
X#ifdef SYSV
Xkillpg(grp, sig)
X int grp;
X int sig;
X{
X return( kill (-grp, sig) );
X}
X#endif
________This_Is_The_END________
if test `wc -l < screen.c` -ne 1953; then
echo 'shar: screen.c was damaged during transit (should have been 1953 bytes)'
fi
fi ; : end of overwriting check
echo 'x - screen.h'
if test -f screen.h; then echo 'shar: not overwriting screen.h'; else
sed 's/^X//' << '________This_Is_The_END________' > screen.h
X/* Copyright (c) 1987,1988 Oliver Laumann, Technical University of Berlin.
X * Not derived from licensed software.
X *
X * Permission is granted to freely use, copy, modify, and redistribute
X * this software, provided that no attempt is made to gain profit from it,
X * the author is not construed to be liable for any results of using the
X * software, alterations are clearly marked as such, and this notice is
X * not modified.
X */
X
Xenum state_t {
X LIT, /* Literal input */
X ESC, /* Start of escape sequence */
X STR, /* Start of control string */
X TERM, /* ESC seen in control string */
X CSI, /* Reading arguments in "CSI Pn ; Pn ; ... ; XXX" */
X PRIN, /* Printer mode */
X PRINESC, /* ESC seen in printer mode */
X PRINCSI, /* CSI seen in printer mode */
X PRIN4 /* CSI 4 seen in printer mode */
X};
X
Xenum string_t {
X NONE,
X DCS, /* Device control string */
X OSC, /* Operating system command */
X APC, /* Application program command */
X PM, /* Privacy message */
X};
X
X#define MAXSTR 128
X#define MAXARGS 64
X
X#define IOSIZE 80
X
Xstruct win {
X int wpid;
X int ptyfd;
X int aflag;
X char outbuf[IOSIZE];
X int outlen;
X char cmd[MAXSTR];
X char tty[MAXSTR];
X int args[MAXARGS];
X char GotArg[MAXARGS];
X int NumArgs;
X int slot;
X char **image;
X char **attr;
X char **font;
X int LocalCharset;
X int charsets[4];
X int ss;
X int active;
X int x, y;
X char LocalAttr;
X int saved;
X int Saved_x, Saved_y;
X char SavedLocalAttr;
X int SavedLocalCharset;
X int SavedCharsets[4];
X int top, bot;
X int wrap;
X int origin;
X int insert;
X int keypad;
X enum state_t state;
X enum string_t StringType;
X char string[MAXSTR];
X char *stringp;
X char *tabs;
X int vbwait;
X int bell;
X};
X
X#define MAXLINE 1024
X
X#define MSG_CREATE 0
X#define MSG_ERROR 1
X#define MSG_ATTACH 2
X#define MSG_CONT 3
X
Xstruct msg {
X int type;
X union {
X struct {
X int aflag;
X int nargs;
X char line[MAXLINE];
X char dir[1024];
X } create;
X struct {
X int apid;
X char tty[1024];
X } attach;
X char message[MAXLINE];
X } m;
X};
________This_Is_The_END________
if test `wc -l < screen.h` -ne 98; then
echo 'shar: screen.h was damaged during transit (should have been 98 bytes)'
fi
fi ; : end of overwriting check
echo 'x - screen.tic'
if test -f screen.tic; then echo 'shar: not overwriting screen.tic'; else
sed 's/^X//' << '________This_Is_The_END________' > screen.tic
Xscreen,
X xon,
X cols#80, lines#24,
X bel=^G, blink=\E[5m, bold=\E[1m, cbt=\E[Z,
X clear=\E[2J\E[H, cr=\r, csr=\E[%i%p1%d;%p2%dr,
X cub=\E[%p1%dD, cub1=\b, cud=\E[%p1%dB, cud1=\n,
X cuf=\E[%p1%dC, cuf1=\E[C, cup=\E[%i%p1%d;%p2%dH,
X cuu=\E[%p1%dA, cuu1=\E[A, dl=\E[%p1%dM, dl1=\E[M,
X el=\E[K, ht=\t, hts=\EH, il=\E[%p1%dL, il1=\E[L,
X ind=\n, kbs=\b, kcub1=\EOD, kcud1=\EOB, kcuf1=\EOC,
X kcuu1=\EOA, kf0=\EOy, kf1=\EOP, kf2=\EOQ, kf3=\EOR,
X kf4=\EOS, kf5=\EOt, kf6=\EOu, kf7=\EOv, kf8=\EOl,
X kf9=\EOw, rc=\E8, rev=\E[7m, ri=\EM, rmkx=\E>,
X rmso=\E[23m, rmul=\E[24m, rs2=\Ec, sc=\E7, sgr0=\E[0m,
X smkx=\E=, smso=\E[3m, smul=\E[4m, tbc=\E[3g,
________This_Is_The_END________
if test `wc -l < screen.tic` -ne 15; then
echo 'shar: screen.tic was damaged during transit (should have been 15 bytes)'
fi
fi ; : end of overwriting check
exit 0