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+/* Copyright (c) 2008, 2009
+ * Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
+ * Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
+ * Micah Cowan (micah@cowan.name)
+ * Sadrul Habib Chowdhury (sadrul@users.sourceforge.net)
+ * Copyright (c) 1993-2002, 2003, 2005, 2006, 2007
+ * Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
+ * Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
+ * Copyright (c) 1987 Oliver Laumann
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program (see the file COPYING); if not, see
+ * http://www.gnu.org/licenses/, or contact Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
+ *
+ ****************************************************************
+ * $Id$ GNU
+ */
+
+#include "os.h"
+
+#if defined(__STDC__)
+# ifndef __P
+# define __P(a) a
+# endif
+#else
+# ifndef __P
+# define __P(a) ()
+# endif
+# define const
+#endif
+
+#include "osdef.h"
+
+#include "ansi.h"
+#include "sched.h"
+#include "acls.h"
+#include "comm.h"
+#include "layer.h"
+#include "term.h"
+
+
+#ifdef DEBUG
+# define STATIC /* a function that the debugger should see */
+#else
+# define STATIC static
+#endif
+
+#ifdef DEBUG
+# define DEBUGDIR "/tmp/debug"
+# define debugf(a) do {if(dfp){fprintf a;fflush(dfp);}} while (0)
+# define debug(x) debugf((dfp,x))
+# define debug1(x,a) debugf((dfp,x,a))
+# define debug2(x,a,b) debugf((dfp,x,a,b))
+# define debug3(x,a,b,c) debugf((dfp,x,a,b,c))
+ extern FILE *dfp;
+#else
+# define debugf(a) do {} while (0)
+# define debug(x) debugf(x)
+# define debug1(x,a) debugf(x)
+# define debug2(x,a,b) debugf(x)
+# define debug3(x,a,b,c) debugf(x)
+#endif
+
+#ifndef DEBUG
+# define NOASSERT
+#endif
+
+#ifndef NOASSERT
+# if defined(__STDC__)
+# define ASSERT(lousy_cpp) do {if (!(lousy_cpp)) {if (!dfp) opendebug(0, 1);debug2("ASSERT("#lousy_cpp") failed file %s line %d\n", __FILE__, __LINE__);abort();}} while (0)
+# else
+# define ASSERT(lousy_cpp) do {if (!(lousy_cpp)) {if (!dfp) opendebug(0, 1);debug2("ASSERT(lousy_cpp) failed file %s line %d\n", __FILE__, __LINE__);abort();}} while (0)
+# endif
+#else
+# define ASSERT(lousy_cpp) do {} while (0)
+#endif
+
+/* here comes my own Free: jw. */
+#define Free(a) {if ((a) == 0) abort(); else free((void *)(a)); (a)=0;}
+
+#define Ctrl(c) ((c)&037)
+
+#define MAXSTR 768
+#define MAXARGS 64
+#define MSGWAIT 5
+#define MSGMINWAIT 1
+#define SILENCEWAIT 30
+
+/*
+ * if a nasty user really wants to try a history of 3000 lines on all 10
+ * windows, he will allocate 8 MegaBytes of memory, which is quite enough.
+ */
+#define MAXHISTHEIGHT 3000
+#define DEFAULTHISTHEIGHT 100
+#if defined(NAME_MAX) && NAME_MAX < 16
+# define DEFAULT_BUFFERFILE "/tmp/screen-xchg"
+#else
+# define DEFAULT_BUFFERFILE "/tmp/screen-exchange"
+#endif
+
+
+#if defined(hpux) && !(defined(VSUSP) && defined(VDSUSP) && defined(VWERASE) && defined(VLNEXT))
+# define HPUX_LTCHARS_HACK
+#endif
+
+struct mode
+{
+#ifdef POSIX
+ struct termios tio;
+# ifdef HPUX_LTCHARS_HACK
+ struct ltchars m_ltchars;
+# endif /* HPUX_LTCHARS_HACK */
+#else /* POSIX */
+# ifdef TERMIO
+ struct termio tio;
+# ifdef CYTERMIO
+ int m_mapkey;
+ int m_mapscreen;
+ int m_backspace;
+# endif
+# else /* TERMIO */
+ struct sgttyb m_ttyb;
+ struct tchars m_tchars;
+ struct ltchars m_ltchars;
+ int m_ldisc;
+ int m_lmode;
+# endif /* TERMIO */
+#endif /* POSIX */
+#if defined(KANJI) && defined(TIOCKSET)
+ struct jtchars m_jtchars;
+ int m_knjmode;
+#endif
+};
+
+
+/* #include "logfile.h" */ /* (requires stat.h) struct logfile */
+#include "image.h"
+#include "canvas.h"
+#include "display.h"
+#include "window.h"
+
+/*
+ * Parameters for the Detach() routine
+ */
+#define D_DETACH 0
+#define D_STOP 1
+#define D_REMOTE 2
+#define D_POWER 3
+#define D_REMOTE_POWER 4
+#define D_LOCK 5
+#define D_HANGUP 6
+
+/*
+ * Here are the messages the attacher sends to the backend
+ */
+#define MSG_CREATE 0
+#define MSG_ERROR 1
+#define MSG_ATTACH 2
+#define MSG_CONT 3
+#define MSG_DETACH 4
+#define MSG_POW_DETACH 5
+#define MSG_WINCH 6
+#define MSG_HANGUP 7
+#define MSG_COMMAND 8
+#define MSG_QUERY 9
+
+/*
+ * versions of struct msg:
+ * 0: screen version 3.6.6 (version count introduced)
+ * 1: screen version 4.1.0devel (revisions e3fc19a upto 8147d08)
+ * A few revisions after 8147d08 incorrectly
+ * carried version 1, but should have carried 2.
+ * 2: screen version 4.1.0devel (revisions 8b46d8a upto YYYYYYY)
+ * 3: screen version 4.2.0 (was incorrectly originally. Patched here)
+ * 4: screen version 4.2.1 (bumped once again due to changed terminal and login length)
+ * 5: screen version 4.4.0 (fix screenterm size)
+ */
+#define MSG_VERSION 5
+
+#define MSG_REVISION (('m'<<24) | ('s'<<16) | ('g'<<8) | MSG_VERSION)
+struct msg
+{
+ int protocol_revision; /* reduce harm done by incompatible messages */
+ int type;
+ char m_tty[MAXPATHLEN]; /* ttyname */
+ union
+ {
+ struct
+ {
+ int lflag;
+ int aflag;
+ int flowflag;
+ int hheight; /* size of scrollback buffer */
+ int nargs;
+ char line[MAXPATHLEN];
+ char dir[MAXPATHLEN];
+ char screenterm[MAXTERMLEN + 1]; /* is screen really "screen" ? */
+ }
+ create;
+ struct
+ {
+ char auser[MAXLOGINLEN + 1]; /* username */
+ int apid; /* pid of frontend */
+ int adaptflag; /* adapt window size? */
+ int lines, columns; /* display size */
+ char preselect[20];
+ int esc; /* his new escape character unless -1 */
+ int meta_esc; /* his new meta esc character unless -1 */
+ char envterm[MAXTERMLEN + 1]; /* terminal type */
+ int encoding; /* encoding of display */
+ int detachfirst; /* whether to detach remote sessions first */
+ }
+ attach;
+ struct
+ {
+ char duser[MAXLOGINLEN + 1]; /* username */
+ int dpid; /* pid of frontend */
+ }
+ detach;
+ struct
+ {
+ char auser[MAXLOGINLEN + 1]; /* username */
+ int nargs;
+ char cmd[MAXPATHLEN]; /* command */
+ int apid; /* pid of frontend */
+ char preselect[20];
+ char writeback[MAXPATHLEN]; /* The socket to write the result.
+ Only used for MSG_QUERY */
+ }
+ command;
+ char message[MAXPATHLEN * 2];
+ } m;
+};
+
+/*
+ * And the signals the attacher receives from the backend
+ */
+#define SIG_BYE SIGHUP
+#define SIG_POWER_BYE SIGUSR1
+#define SIG_LOCK SIGUSR2
+#define SIG_STOP SIGTSTP
+#ifdef SIGIO
+#define SIG_NODEBUG SIGIO /* triggerd by command 'debug off' */
+#endif
+
+
+#define BELL (Ctrl('g'))
+#define VBELLWAIT 1 /* No. of seconds a vbell will be displayed */
+
+#define BELL_ON 0 /* No bell has occurred in the window */
+#define BELL_FOUND 1 /* A bell has occurred, but user not yet notified */
+#define BELL_DONE 2 /* A bell has occured, user has been notified */
+
+#define BELL_VISUAL 3 /* A bell has occured in fore win, notify him visually */
+
+#define MON_OFF 0 /* Monitoring is off in the window */
+#define MON_ON 1 /* No activity has occurred in the window */
+#define MON_FOUND 2 /* Activity has occured, but user not yet notified */
+#define MON_DONE 3 /* Activity has occured, user has been notified */
+
+#define DUMP_TERMCAP 0 /* WriteFile() options */
+#define DUMP_HARDCOPY 1
+#define DUMP_EXCHANGE 2
+#define DUMP_SCROLLBACK 3
+
+#define SILENCE_OFF 0 /* Not checking for silence */
+#define SILENCE_ON 1 /* Window being monitored for silence */
+#define SILENCE_FOUND 2 /* Window is silent */
+#define SILENCE_DONE 3 /* Window is silent and user is notified */
+
+extern char strnomem[];
+
+/*
+ * line modes used by Input()
+ */
+#define INP_COOKED 0
+#define INP_NOECHO 1
+#define INP_RAW 2
+#define INP_EVERY 4
+
+
+#ifdef MULTIUSER
+struct acl
+{
+ struct acl *next;
+ char *name;
+};
+#endif
+
+/* register list */
+#define MAX_PLOP_DEFS 256
+
+struct baud_values
+{
+ int idx; /* the index in the bsd-is padding lookup table */
+ int bps; /* bits per seconds */
+ int sym; /* symbol defined in ttydev.h */
+};
+
+/*
+ * windowlist orders
+ */
+#define WLIST_NUM 0
+#define WLIST_MRU 1
+#define WLIST_NESTED 2