src/screen.c

   1 /* Copyright (c) 1993-2002
   2  *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
   3  *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
   4  * Copyright (c) 1987 Oliver Laumann
   5 #ifdef HAVE_BRAILLE
   6  * Modified by:
   7  *      Authors:  Hadi Bargi Rangin  bargi@dots.physics.orst.edu
   8  *                Bill Barry         barryb@dots.physics.orst.edu
   9  *                Randy Lundquist    randyl@dots.physics.orst.edu
  10  *
  11  * Modifications Copyright (c) 1995 by
  12  * Science Access Project, Oregon State University.
  13 #endif
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2, or (at your option)
  18  * any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program (see the file COPYING); if not, write to the
  27  * Free Software Foundation, Inc.,
  28  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
  29  *
  30  ****************************************************************
  31  */
  32
  33 #include <sys/types.h>
  34 #include <ctype.h>
  35
  36 #include <fcntl.h>
  37
  38 #ifdef sgi
  39 # include <sys/sysmacros.h>
  40 #endif
  41
  42 #include <sys/stat.h>
  43 #ifndef sun
  44 # include <sys/ioctl.h>
  45 #endif
  46
  47 #ifndef SIGINT
  48 # include <signal.h>
  49 #endif
  50
  51 #include "config.h"
  52
  53 #ifdef HAVE_STROPTS_H
  54 # include <sys/stropts.h>
  55 #endif
  56
  57 #if defined(SYSV) && !defined(ISC)
  58 # include <sys/utsname.h>
  59 #endif
  60
  61 #if defined(sequent) || defined(SVR4)
  62 # include <sys/resource.h>
  63 #endif /* sequent || SVR4 */
  64
  65 #ifdef ISC
  66 # include <sys/tty.h>
  67 # include <sys/sioctl.h>
  68 # include <sys/pty.h>
  69 #endif /* ISC */
  70
  71 #if (defined(AUX) || defined(_AUX_SOURCE)) && defined(POSIX)
  72 # include <compat.h>
  73 #endif
  74 #if defined(USE_LOCALE) || defined(ENCODINGS)
  75 # include <locale.h>
  76 #endif
  77 #if defined(HAVE_NL_LANGINFO) && defined(ENCODINGS)
  78 # include <langinfo.h>
  79 #endif
  80
  81 #include "screen.h"
  82 #ifdef HAVE_BRAILLE
  83 # include "braille.h"
  84 #endif
  85
  86 #include "patchlevel.h"
  87
  88 /*
  89  *  At the moment we only need the real password if the
  90  *  builtin lock is used. Therefore disable SHADOWPW if
  91  *  we do not really need it (kind of security thing).
  92  */
  93 #ifndef LOCK
  94 # undef SHADOWPW
  95 #endif
  96
  97 #include <pwd.h>
  98 #ifdef SHADOWPW
  99 # include <shadow.h>
 100 #endif /* SHADOWPW */
 101
 102 #include "logfile.h"    /* islogfile, logfflush */
 103
 104 #ifdef DEBUG
 105 FILE *dfp;
 106 #endif
 107
 108
 109 extern char Term[], screenterm[], **environ, Termcap[];
 110 int force_vt = 1;
 111 int VBellWait, MsgWait, MsgMinWait, SilenceWait;
 112
 113 extern struct acluser *users;
 114 extern struct display *displays, *display;
 115
 116
 117 extern int visual_bell;
 118 #ifdef COPY_PASTE
 119 extern unsigned char mark_key_tab[];
 120 #endif
 121 extern char version[];
 122 extern char DefaultShell[];
 123 #ifdef ZMODEM
 124 extern char *zmodem_sendcmd;
 125 extern char *zmodem_recvcmd;
 126 #endif
 127 extern struct layout *layout_last;
 128
 129
 130 char *ShellProg;
 131 char *ShellArgs[2];
 132
 133 extern struct NewWindow nwin_undef, nwin_default, nwin_options;
 134 struct backtick;
 135
 136 static struct passwd *getpwbyname __P((char *, struct passwd *));
 137 static void  SigChldHandler __P((void));
 138 static sigret_t SigChld __P(SIGPROTOARG);
 139 static sigret_t SigInt __P(SIGPROTOARG);
 140 static sigret_t CoreDump __P(SIGPROTOARG);
 141 static sigret_t FinitHandler __P(SIGPROTOARG);
 142 static void  DoWait __P((void));
 143 static void  serv_read_fn __P((struct event *, char *));
 144 static void  serv_select_fn __P((struct event *, char *));
 145 static void  logflush_fn __P((struct event *, char *));
 146 static void  backtick_filter __P((struct backtick *));
 147 static void  backtick_fn __P((struct event *, char *));
 148 static char *runbacktick __P((struct backtick *, int *, time_t));
 149 static int   IsSymbol __P((char *, char *));
 150 static char *ParseChar __P((char *, char *));
 151 static int   ParseEscape __P((char *));
 152 static char *pad_expand __P((char *, char *, int, int));
 153 #ifdef DEBUG
 154 static void  fds __P((void));
 155 #endif
 156
 157 int nversion;   /* numerical version, used for secondary DA */
 158
 159 /* the attacher */
 160 struct passwd *ppp;
 161 char *attach_tty;
 162 int attach_fd = -1;
 163 char *attach_term;
 164 char *LoginName;
 165 struct mode attach_Mode;
 166
 167 char SockPath[MAXPATHLEN + 2 * MAXSTR];
 168 char *SockName;                 /* SockName is pointer in SockPath */
 169 char *SockMatch = NULL;         /* session id command line argument */
 170 int ServerSocket = -1;
 171 struct event serv_read;
 172 struct event serv_select;
 173 struct event logflushev;
 174
 175 char **NewEnv = NULL;
 176
 177 char *RcFileName = NULL;
 178 char *home;
 179
 180 char *screenlogfile;                    /* filename layout */
 181 int log_flush = 10;                     /* flush interval in seconds */
 182 int logtstamp_on = 0;                   /* tstamp disabled */
 183 char *logtstamp_string;                 /* stamp layout */
 184 int logtstamp_after = 120;              /* first tstamp after 120s */
 185 char *hardcopydir = NULL;
 186 char *BellString;
 187 char *VisualBellString;
 188 char *ActivityString;
 189 #ifdef COPY_PASTE
 190 char *BufferFile;
 191 #endif
 192 #ifdef POW_DETACH
 193 char *PowDetachString;
 194 #endif
 195 char *hstatusstring;
 196 char *captionstring;
 197 char *timestring;
 198 char *wliststr;
 199 char *wlisttit;
 200 int auto_detach = 1;
 201 int iflag, rflag, dflag, lsflag, quietflag, wipeflag, xflag;
 202 int cmdflag;
 203 int adaptflag;
 204
 205 #ifdef MULTIUSER
 206 char *multi;
 207 char *multi_home;
 208 int multi_uid;
 209 int own_uid;
 210 int multiattach;
 211 int tty_mode;
 212 int tty_oldmode = -1;
 213 #endif
 214
 215 char HostName[MAXSTR];
 216 int MasterPid, PanicPid;
 217 int real_uid, real_gid, eff_uid, eff_gid;
 218 int default_startup;
 219 int ZombieKey_destroy, ZombieKey_resurrect, ZombieKey_onerror;
 220 char *preselect = NULL;         /* only used in Attach() */
 221
 222 #ifdef UTF8
 223 char *screenencodings;
 224 #endif
 225
 226 #ifdef DW_CHARS
 227 int cjkwidth;
 228 #endif
 229
 230 #ifdef NETHACK
 231 int nethackflag = 0;
 232 #endif
 233 int maxwin = MAXWIN;
 234
 235
 236 struct layer *flayer;
 237 struct win *fore;
 238 struct win *windows;
 239 struct win *console_window;
 240
 241
 242
 243 /*
 244  * Do this last
 245  */
 246 #include "extern.h"
 247
 248 char strnomem[] = "Out of memory.";
 249
 250
 251 static int InterruptPlease;
 252 static int GotSigChld;
 253
 254 static int
 255 lf_secreopen(name, wantfd, l)
 256 char *name;
 257 int wantfd;
 258 struct logfile *l;
 259 {
 260   int got_fd;
 261
 262   close(wantfd);
 263   if (((got_fd = secopen(name, O_WRONLY | O_CREAT | O_APPEND, 0666)) < 0) ||
 264       lf_move_fd(got_fd, wantfd) < 0)
 265     {
 266       logfclose(l);
 267       debug1("lf_secreopen: failed for %s\n", name);
 268       return -1;
 269     }
 270   l->st->st_ino = l->st->st_dev = 0;
 271   debug2("lf_secreopen: %d = %s\n", wantfd, name);
 272   return 0;
 273 }
 274
 275 /********************************************************************/
 276 /********************************************************************/
 277 /********************************************************************/
 278
 279
 280 static struct passwd *
 281 getpwbyname(name, ppp)
 282 char *name;
 283 struct passwd *ppp;
 284 {
 285   int n;
 286 #ifdef SHADOWPW
 287   struct spwd *sss = NULL;
 288   static char *spw = NULL;
 289 #endif
 290
 291   if (!ppp && !(ppp = getpwnam(name)))
 292     return NULL;
 293
 294   /* Do password sanity check..., allow ##user for SUN_C2 security */
 295 #ifdef SHADOWPW
 296 pw_try_again:
 297 #endif
 298   n = 0;
 299   if (ppp->pw_passwd[0] == '#' && ppp->pw_passwd[1] == '#' &&
 300       strcmp(ppp->pw_passwd + 2, ppp->pw_name) == 0)
 301     n = 13;
 302   for (; n < 13; n++)
 303     {
 304       char c = ppp->pw_passwd[n];
 305       if (!(c == '.' || c == '/' || c == '$' ||
 306             (c >= '0' && c <= '9') ||
 307             (c >= 'a' && c <= 'z') ||
 308             (c >= 'A' && c <= 'Z')))
 309         break;
 310     }
 311
 312 #ifdef SHADOWPW
 313   /* try to determine real password */
 314   if (n < 13 && sss == 0)
 315     {
 316       sss = getspnam(ppp->pw_name);
 317       if (sss)
 318         {
 319           if (spw)
 320             free(spw);
 321           ppp->pw_passwd = spw = SaveStr(sss->sp_pwdp);
 322           endspent();   /* this should delete all buffers ... */
 323           goto pw_try_again;
 324         }
 325       endspent();       /* this should delete all buffers ... */
 326     }
 327 #endif
 328   if (n < 13)
 329     ppp->pw_passwd = 0;
 330 #ifdef linux
 331   if (ppp->pw_passwd && strlen(ppp->pw_passwd) == 13 + 11)
 332     ppp->pw_passwd[13] = 0;     /* beware of linux's long passwords */
 333 #endif
 334
 335   return ppp;
 336 }
 337
 338 static char *
 339 locale_name(void)
 340 {
 341   char *s;
 342
 343   s = getenv("LC_ALL");
 344   if (s == NULL)
 345     s = getenv("LC_CTYPE");
 346   if (s == NULL)
 347     s = getenv("LANG");
 348   return s;
 349 }
 350
 351 int
 352 main(ac, av)
 353 int ac;
 354 char **av;
 355 {
 356   register int n;
 357   char *ap;
 358   char *av0;
 359   char socknamebuf[2 * MAXSTR];
 360   int mflag = 0;
 361   char *myname = (ac == 0) ? "screen" : av[0];
 362   char *SockDir;
 363   struct stat st;
 364 #ifdef _MODE_T                  /* (jw) */
 365   mode_t oumask;
 366 #else
 367   int oumask;
 368 #endif
 369 #if defined(SYSV) && !defined(ISC)
 370   struct utsname utsnam;
 371 #endif
 372   struct NewWindow nwin;
 373   int detached = 0;             /* start up detached */
 374 #ifdef MULTIUSER
 375   char *sockp;
 376 #endif
 377   char *sty = 0;
 378
 379 #if (defined(AUX) || defined(_AUX_SOURCE)) && defined(POSIX)
 380   setcompat(COMPAT_POSIX|COMPAT_BSDPROT); /* turn on seteuid support */
 381 #endif
 382 #if defined(sun) && defined(SVR4)
 383   {
 384     /* Solaris' login blocks SIGHUP! This is _very bad_ */
 385     sigset_t sset;
 386     sigemptyset(&sset);
 387     sigprocmask(SIG_SETMASK, &sset, 0);
 388   }
 389 #endif
 390
 391   /*
 392    *  First, close all unused descriptors
 393    *  (otherwise, we might have problems with the select() call)
 394    */
 395   closeallfiles(0);
 396 #ifdef DEBUG
 397   opendebug(1, 0);
 398 #endif
 399   sprintf(version, "%d.%.2d.%.2d%s (%s) %s", REV, VERS,
 400           PATCHLEVEL, STATE, ORIGIN, DATE);
 401   nversion = REV * 10000 + VERS * 100 + PATCHLEVEL;
 402   debug2("-- screen debug started %s (%s)\n", *av, version);
 403 #ifdef POSIX
 404   debug("POSIX\n");
 405 #endif
 406 #ifdef TERMIO
 407   debug("TERMIO\n");
 408 #endif
 409 #ifdef SYSV
 410   debug("SYSV\n");
 411 #endif
 412 #ifdef SYSVSIGS
 413   debug("SYSVSIGS\n");
 414 #endif
 415 #ifdef NAMEDPIPE
 416   debug("NAMEDPIPE\n");
 417 #endif
 418 #if defined(SIGWINCH) && defined(TIOCGWINSZ)
 419   debug("Window size changing enabled\n");
 420 #endif
 421 #ifdef HAVE_SETREUID
 422   debug("SETREUID\n");
 423 #endif
 424 #ifdef HAVE_SETEUID
 425   debug("SETEUID\n");
 426 #endif
 427 #ifdef hpux
 428   debug("hpux\n");
 429 #endif
 430 #ifdef USEBCOPY
 431   debug("USEBCOPY\n");
 432 #endif
 433 #ifdef UTMPOK
 434   debug("UTMPOK\n");
 435 #endif
 436 #ifdef LOADAV
 437   debug("LOADAV\n");
 438 #endif
 439 #ifdef NETHACK
 440   debug("NETHACK\n");
 441 #endif
 442 #ifdef TERMINFO
 443   debug("TERMINFO\n");
 444 #endif
 445 #ifdef SHADOWPW
 446   debug("SHADOWPW\n");
 447 #endif
 448 #ifdef NAME_MAX
 449   debug1("NAME_MAX = %d\n", NAME_MAX);
 450 #endif
 451
 452   BellString = SaveStr("Bell in window %n");
 453   VisualBellString = SaveStr("   Wuff,  Wuff!!  ");
 454   ActivityString = SaveStr("Activity in window %n");
 455   screenlogfile = SaveStr("screenlog.%n");
 456   logtstamp_string = SaveStr("-- %n:%t -- time-stamp -- %M/%d/%y %c:%s --\n");
 457   hstatusstring = SaveStr("%h");
 458   captionstring = SaveStr("%3n %t");
 459   timestring = SaveStr("%c:%s %M %d %H%? %l%?");
 460   wlisttit = SaveStr("Num Name%=Flags");
 461   wliststr = SaveStr("%3n %t%=%f");
 462 #ifdef COPY_PASTE
 463   BufferFile = SaveStr(DEFAULT_BUFFERFILE);
 464 #endif
 465   ShellProg = NULL;
 466 #ifdef POW_DETACH
 467   PowDetachString = 0;
 468 #endif
 469   default_startup = (ac > 1) ? 0 : 1;
 470   adaptflag = 0;
 471   VBellWait = VBELLWAIT * 1000;
 472   MsgWait = MSGWAIT * 1000;
 473   MsgMinWait = MSGMINWAIT * 1000;
 474   SilenceWait = SILENCEWAIT;
 475 #ifdef HAVE_BRAILLE
 476   InitBraille();
 477 #endif
 478 #ifdef ZMODEM
 479   zmodem_sendcmd = SaveStr("!!! sz -vv -b ");
 480   zmodem_recvcmd = SaveStr("!!! rz -vv -b -E");
 481 #endif
 482
 483 #ifdef COPY_PASTE
 484   CompileKeys((char *)0, 0, mark_key_tab);
 485 #endif
 486 #ifdef UTF8
 487   InitBuiltinTabs();
 488   screenencodings = SaveStr(SCREENENCODINGS);
 489 #endif
 490 #ifdef DW_CHARS
 491   cjkwidth = 0;
 492 #endif
 493   nwin = nwin_undef;
 494   nwin_options = nwin_undef;
 495   strcpy(screenterm, "screen");
 496
 497   logreopen_register(lf_secreopen);
 498
 499   av0 = *av;
 500   /* if this is a login screen, assume -RR */
 501   if (*av0 == '-')
 502     {
 503       rflag = 4;
 504 #ifdef MULTI
 505       xflag = 1;
 506 #else
 507       dflag = 1;
 508 #endif
 509       ShellProg = SaveStr(DefaultShell); /* to prevent nasty circles */
 510     }
 511   while (ac > 0)
 512     {
 513       ap = *++av;
 514       if (--ac > 0 && *ap == '-')
 515         {
 516           if (ap[1] == '-' && ap[2] == 0)
 517             {
 518               av++;
 519               ac--;
 520               break;
 521             }
 522           if (ap[1] == '-' && !strcmp(ap, "--version"))
 523             Panic(0, "Screen version %s", version);
 524           if (ap[1] == '-' && !strcmp(ap, "--help"))
 525             exit_with_usage(myname, NULL, NULL);
 526           while (ap && *ap && *++ap)
 527             {
 528               switch (*ap)
 529                 {
 530                 case 'a':
 531                   nwin_options.aflag = 1;
 532                   break;
 533                 case 'A':
 534                   adaptflag = 1;
 535                   break;
 536                 case 'p': /* preselect */
 537                   if (*++ap)
 538                     preselect = ap;
 539                   else
 540                     {
 541                       if (!--ac)
 542                         exit_with_usage(myname, "Specify a window to preselect with -p", NULL);
 543                       preselect = *++av;
 544                     }
 545                   ap = NULL;
 546                   break;
 547 #ifdef HAVE_BRAILLE
 548                 case 'B':
 549                   bd.bd_start_braille = 1;
 550                   break;
 551 #endif
 552                 case 'c':
 553                   if (*++ap)
 554                     RcFileName = ap;
 555                   else
 556                     {
 557                       if (--ac == 0)
 558                         exit_with_usage(myname, "Specify an alternate rc-filename with -c", NULL);
 559                       RcFileName = *++av;
 560                     }
 561                   ap = NULL;
 562                   break;
 563                 case 'e':
 564                   if (!*++ap)
 565                     {
 566                       if (--ac == 0)
 567                         exit_with_usage(myname, "Specify command characters with -e", NULL);
 568                       ap = *++av;
 569                     }
 570                   if (ParseEscape(ap))
 571                     Panic(0, "Two characters are required with -e option, not '%s'.", ap);
 572                   ap = NULL;
 573                   break;
 574                 case 'f':
 575                   ap++;
 576                   switch (*ap++)
 577                     {
 578                     case 'n':
 579                     case '0':
 580                       nwin_options.flowflag = FLOW_NOW * 0;
 581                       break;
 582                     case '\0':
 583                       ap--;
 584                       /* FALLTHROUGH */
 585                     case 'y':
 586                     case '1':
 587                       nwin_options.flowflag = FLOW_NOW * 1;
 588                       break;
 589                     case 'a':
 590                       nwin_options.flowflag = FLOW_AUTOFLAG;
 591                       break;
 592                     default:
 593                       exit_with_usage(myname, "Unknown flow option -%s", --ap);
 594                     }
 595                   break;
 596                 case 'h':
 597                   if (--ac == 0)
 598                     exit_with_usage(myname, NULL, NULL);
 599                   nwin_options.histheight = atoi(*++av);
 600                   if (nwin_options.histheight < 0)
 601                     exit_with_usage(myname, "-h: %s: negative scrollback size?", *av);
 602                   break;
 603                 case 'i':
 604                   iflag = 1;
 605                   break;
 606                 case 't': /* title, the former AkA == -k */
 607                   if (--ac == 0)
 608                     exit_with_usage(myname, "Specify a new window-name with -t", NULL);
 609                   nwin_options.aka = *++av;
 610                   break;
 611                 case 'l':
 612                   ap++;
 613                   switch (*ap++)
 614                     {
 615                     case 'n':
 616                     case '0':
 617                       nwin_options.lflag = 0;
 618                       break;
 619                     case '\0':
 620                       ap--;
 621                       /* FALLTHROUGH */
 622                     case 'y':
 623                     case '1':
 624                       nwin_options.lflag = 1;
 625                       break;
 626                     case 'a':
 627                       nwin_options.lflag = 3;
 628                       break;
 629                     case 's':   /* -ls */
 630                     case 'i':   /* -list */
 631                       lsflag = 1;
 632                       if (ac > 1 && !SockMatch)
 633                         {
 634                           SockMatch = *++av;
 635                           ac--;
 636                         }
 637                       ap = NULL;
 638                       break;
 639                     default:
 640                       exit_with_usage(myname, "%s: Unknown suboption to -l", --ap);
 641                     }
 642                   break;
 643                 case 'w':
 644                   lsflag = 1;
 645                   wipeflag = 1;
 646                   if (ac > 1 && !SockMatch)
 647                     {
 648                       SockMatch = *++av;
 649                       ac--;
 650                     }
 651                   break;
 652                 case 'L':
 653                   nwin_options.Lflag = 1;
 654                   break;
 655                 case 'm':
 656                   mflag = 1;
 657                   break;
 658                 case 'O':               /* to be (or not to be?) deleted. jw. */
 659                   force_vt = 0;
 660                   break;
 661                 case 'T':
 662                   if (--ac == 0)
 663                     exit_with_usage(myname, "Specify terminal-type with -T", NULL);
 664                   if (strlen(*++av) < 20)
 665                     strcpy(screenterm, *av);
 666                   else
 667                     Panic(0, "-T: terminal name too long. (max. 20 char)");
 668                   nwin_options.term = screenterm;
 669                   break;
 670                 case 'q':
 671                   quietflag = 1;
 672                   break;
 673                 case 'r':
 674                 case 'R':
 675 #ifdef MULTI
 676                 case 'x':
 677 #endif
 678                   if (ac > 1 && *av[1] != '-' && !SockMatch)
 679                     {
 680                       SockMatch = *++av;
 681                       ac--;
 682                       debug2("rflag=%d, SockMatch=%s\n", dflag, SockMatch);
 683                     }
 684 #ifdef MULTI
 685                   if (*ap == 'x')
 686                     xflag = 1;
 687 #endif
 688                   if (rflag)
 689                     rflag = 2;
 690                   rflag += (*ap == 'R') ? 2 : 1;
 691                   break;
 692 #ifdef REMOTE_DETACH
 693                 case 'd':
 694                   dflag = 1;
 695                   /* FALLTHROUGH */
 696                 case 'D':
 697                   if (!dflag)
 698                     dflag = 2;
 699                   if (ac == 2)
 700                     {
 701                       if (*av[1] != '-' && !SockMatch)
 702                         {
 703                           SockMatch = *++av;
 704                           ac--;
 705                           debug2("dflag=%d, SockMatch=%s\n", dflag, SockMatch);
 706                         }
 707                     }
 708                   break;
 709 #endif
 710                 case 's':
 711                   if (--ac == 0)
 712                     exit_with_usage(myname, "Specify shell with -s", NULL);
 713                   if (ShellProg)
 714                     free(ShellProg);
 715                   ShellProg = SaveStr(*++av);
 716                   debug1("ShellProg: '%s'\n", ShellProg);
 717                   break;
 718                 case 'S':
 719                   if (!SockMatch)
 720                     {
 721                       if (--ac == 0)
 722                         exit_with_usage(myname, "Specify session-name with -S", NULL);
 723                       SockMatch = *++av;
 724                     }
 725                   if (!*SockMatch)
 726                     exit_with_usage(myname, "Empty session-name?", NULL);
 727                   break;
 728                 case 'X':
 729                   cmdflag = 1;
 730                   break;
 731                 case 'v':
 732                   Panic(0, "Screen version %s", version);
 733                   /* NOTREACHED */
 734 #ifdef UTF8
 735                 case 'U':
 736                   nwin_options.encoding = nwin_options.encoding == -1 ? UTF8 : 0;
 737                   break;
 738 #endif
 739                 default:
 740                   exit_with_usage(myname, "Unknown option %s", --ap);
 741                 }
 742             }
 743         }
 744       else
 745         break;
 746     }
 747
 748   real_uid = getuid();
 749   real_gid = getgid();
 750   eff_uid = geteuid();
 751   eff_gid = getegid();
 752   if (eff_uid != real_uid)
 753     {
 754       /* if running with s-bit, we must install a special signal
 755        * handler routine that resets the s-bit, so that we get a
 756        * core file anyway.
 757        */
 758 #ifdef SIGBUS /* OOPS, linux has no bus errors! */
 759       signal(SIGBUS, CoreDump);
 760 #endif /* SIGBUS */
 761       signal(SIGSEGV, CoreDump);
 762     }
 763
 764 #ifdef USE_LOCALE
 765   setlocale(LC_ALL, "");
 766 #endif
 767 #ifdef ENCODINGS
 768   if (nwin_options.encoding == -1)
 769     {
 770       /* ask locale if we should start in UTF-8 mode */
 771 # ifdef HAVE_NL_LANGINFO
 772 #  ifndef USE_LOCALE
 773       setlocale(LC_CTYPE, "");
 774 #  endif
 775       nwin_options.encoding = FindEncoding(nl_langinfo(CODESET));
 776       debug1("locale says encoding = %d\n", nwin_options.encoding);
 777 # else
 778 #  ifdef UTF8
 779       char *s;
 780       if ((s = locale_name()) && InStr(s, "UTF-8"))
 781         nwin_options.encoding = UTF8;
 782 #  endif
 783       debug1("environment says encoding=%d\n", nwin_options.encoding);
 784 #endif
 785     }
 786 # ifdef DW_CHARS
 787   {
 788     char *s;
 789     if ((s = locale_name()))
 790     {
 791       if(!strncmp(s, "zh_", 3) || !strncmp(s, "ja_", 3) || !strncmp(s, "ko_", 3))
 792       {
 793         cjkwidth = 1;
 794       }
 795     }
 796   }
 797 #endif
 798 #endif
 799   if (SockMatch && strlen(SockMatch) >= MAXSTR)
 800     Panic(0, "Ridiculously long socketname - try again.");
 801   if (cmdflag && !rflag && !dflag && !xflag)
 802     xflag = 1;
 803   if (!cmdflag && dflag && mflag && !(rflag || xflag))
 804     detached = 1;
 805   nwin = nwin_options;
 806 #ifdef ENCODINGS
 807   nwin.encoding = nwin_undef.encoding;  /* let screenrc overwrite it */
 808 #endif
 809   if (ac)
 810     nwin.args = av;
 811
 812   /* make the write() calls return -1 on all errors */
 813 #ifdef SIGXFSZ
 814   /*
 815    * Ronald F. Guilmette, Oct 29 '94, bug-gnu-utils@prep.ai.mit.edu:
 816    * It appears that in System V Release 4, UNIX, if you are writing
 817    * an output file and you exceed the currently set file size limit,
 818    * you _don't_ just get the call to `write' returning with a
 819    * failure code.  Rather, you get a signal called `SIGXFSZ' which,
 820    * if neither handled nor ignored, will cause your program to crash
 821    * with a core dump.
 822    */
 823   signal(SIGXFSZ, SIG_IGN);
 824 #endif /* SIGXFSZ */
 825
 826 #ifdef SIGPIPE
 827   signal(SIGPIPE, SIG_IGN);
 828 #endif
 829
 830   if (!ShellProg)
 831     {
 832       register char *sh;
 833
 834       sh = getenv("SHELL");
 835       ShellProg = SaveStr(sh ? sh : DefaultShell);
 836     }
 837   ShellArgs[0] = ShellProg;
 838   home = getenv("HOME");
 839   if (!mflag && !SockMatch)
 840     {
 841       sty = getenv("STY");
 842       if (sty && *sty == 0)
 843         sty = 0;
 844     }
 845
 846 #ifdef NETHACK
 847   if (!(nethackflag = (getenv("NETHACKOPTIONS") != NULL)))
 848     {
 849       char nethackrc[MAXPATHLEN];
 850
 851       if (home && (strlen(home) < (MAXPATHLEN - 20)))
 852         {
 853           sprintf(nethackrc,"%s/.nethackrc", home);
 854           nethackflag = !access(nethackrc, F_OK);
 855         }
 856     }
 857 #endif
 858
 859 #ifdef MULTIUSER
 860   own_uid = multi_uid = real_uid;
 861   if (SockMatch && (sockp = index(SockMatch, '/')))
 862     {
 863       if (eff_uid)
 864         Panic(0, "Must run suid root for multiuser support.");
 865       *sockp = 0;
 866       multi = SockMatch;
 867       SockMatch = sockp + 1;
 868       if (*multi)
 869         {
 870           struct passwd *mppp;
 871           if ((mppp = getpwnam(multi)) == (struct passwd *)0)
 872             Panic(0, "Cannot identify account '%s'.", multi);
 873           multi_uid = mppp->pw_uid;
 874           multi_home = SaveStr(mppp->pw_dir);
 875           if (strlen(multi_home) > MAXPATHLEN - 10)
 876             Panic(0, "home directory path too long");
 877 # ifdef MULTI
 878           /* always fake multi attach mode */
 879           if (rflag || lsflag)
 880             xflag = 1;
 881 # endif /* MULTI */
 882           detached = 0;
 883           multiattach = 1;
 884         }
 885     }
 886   if (SockMatch && *SockMatch == 0)
 887     SockMatch = 0;
 888 #endif /* MULTIUSER */
 889
 890   if ((LoginName = getlogin()) && LoginName[0] != '\0')
 891     {
 892       if ((ppp = getpwnam(LoginName)) != (struct passwd *) 0)
 893         if ((int)ppp->pw_uid != real_uid)
 894           ppp = (struct passwd *) 0;
 895     }
 896   if (ppp == 0)
 897     {
 898       if ((ppp = getpwuid(real_uid)) == 0)
 899         {
 900           Panic(0, "getpwuid() can't identify your account!");
 901           exit(1);
 902         }
 903       LoginName = ppp->pw_name;
 904     }
 905   LoginName = SaveStr(LoginName);
 906
 907   ppp = getpwbyname(LoginName, ppp);
 908
 909 #if !defined(SOCKDIR) && defined(MULTIUSER)
 910   if (multi && !multiattach)
 911     {
 912       if (home && strcmp(home, ppp->pw_dir))
 913         Panic(0, "$HOME must match passwd entry for multiuser screens.");
 914     }
 915 #endif
 916
 917 #define SET_GUID() do \
 918   { \
 919     setgid(real_gid); \
 920     setuid(real_uid); \
 921     eff_uid = real_uid; \
 922     eff_gid = real_gid; \
 923   } while (0)
 924
 925 #define SET_TTYNAME(fatal) do \
 926   { \
 927     if (!(attach_tty = ttyname(0))) \
 928       { \
 929         if (fatal) \
 930           Panic(0, "Must be connected to a terminal."); \
 931         else \
 932           attach_tty = ""; \
 933       } \
 934     else if (stat(attach_tty, &st)) \
 935       Panic(errno, "Cannot access '%s'", attach_tty); \
 936     if (strlen(attach_tty) >= MAXPATHLEN) \
 937       Panic(0, "TtyName too long - sorry."); \
 938   } while (0)
 939
 940   if (home == 0 || *home == '\0')
 941     home = ppp->pw_dir;
 942   if (strlen(LoginName) > 20)
 943     Panic(0, "LoginName too long - sorry.");
 944 #ifdef MULTIUSER
 945   if (multi && strlen(multi) > 20)
 946     Panic(0, "Screen owner name too long - sorry.");
 947 #endif
 948   if (strlen(home) > MAXPATHLEN - 25)
 949     Panic(0, "$HOME too long - sorry.");
 950
 951   attach_tty = "";
 952   if (!detached && !lsflag && !cmdflag && !(dflag && !mflag && !rflag && !xflag) && !(!mflag && !SockMatch && sty))
 953     {
 954 #ifndef NAMEDPIPE
 955       int fl;
 956 #endif
 957
 958       /* ttyname implies isatty */
 959       SET_TTYNAME(1);
 960 #ifdef MULTIUSER
 961       tty_mode = (int)st.st_mode & 0777;
 962 #endif
 963
 964 #ifndef NAMEDPIPE
 965       fl = fcntl(0, F_GETFL, 0);
 966       if (fl != -1 && (fl & (O_RDWR|O_RDONLY|O_WRONLY)) == O_RDWR)
 967         attach_fd = 0;
 968 #endif
 969       if (attach_fd == -1)
 970         {
 971           if ((n = secopen(attach_tty, O_RDWR | O_NONBLOCK, 0)) < 0)
 972             Panic(0, "Cannot open your terminal '%s' - please check.", attach_tty);
 973           close(n);
 974         }
 975       debug2("attach_tty is %s, attach_fd is %d\n", attach_tty, attach_fd);
 976
 977       if ((attach_term = getenv("TERM")) == 0 || *attach_term == 0)
 978         Panic(0, "Please set a terminal type.");
 979       if (strlen(attach_term) > sizeof(D_termname) - 1)
 980         Panic(0, "$TERM too long - sorry.");
 981       GetTTY(0, &attach_Mode);
 982 #ifdef DEBUGGGGGGGGGGGGGGG
 983       DebugTTY(&attach_Mode);
 984 #endif /* DEBUG */
 985     }
 986
 987 #ifdef _MODE_T
 988   oumask = umask(0);            /* well, unsigned never fails? jw. */
 989 #else
 990   if ((oumask = (int)umask(0)) == -1)
 991     Panic(errno, "Cannot change umask to zero");
 992 #endif
 993   SockDir = getenv("SCREENDIR");
 994   if (SockDir)
 995     {
 996       if (strlen(SockDir) >= MAXPATHLEN - 1)
 997         Panic(0, "Ridiculously long $SCREENDIR - try again.");
 998 #ifdef MULTIUSER
 999       if (multi)
1000         Panic(0, "No $SCREENDIR with multi screens, please.");
1001 #endif
1002     }
1003 #ifdef MULTIUSER
1004   if (multiattach)
1005     {
1006 # ifndef SOCKDIR
1007       sprintf(SockPath, "%s/.screen", multi_home);
1008       SockDir = SockPath;
1009 # else
1010       SockDir = SOCKDIR;
1011       sprintf(SockPath, "%s/S-%s", SockDir, multi);
1012 # endif
1013     }
1014   else
1015 #endif
1016     {
1017 #ifndef SOCKDIR
1018       if (SockDir == 0)
1019         {
1020           sprintf(SockPath, "%s/.screen", home);
1021           SockDir = SockPath;
1022         }
1023 #endif
1024       if (SockDir)
1025         {
1026           if (access(SockDir, F_OK))
1027             {
1028               debug1("SockDir '%s' missing ...\n", SockDir);
1029               if (UserContext() > 0)
1030                 {
1031                   if (mkdir(SockDir, 0700))
1032                     UserReturn(0);
1033                   UserReturn(1);
1034                 }
1035               if (UserStatus() <= 0)
1036                 Panic(0, "Cannot make directory '%s'.", SockDir);
1037             }
1038           if (SockDir != SockPath)
1039             strcpy(SockPath, SockDir);
1040         }
1041 #ifdef SOCKDIR
1042       else
1043         {
1044           SockDir = SOCKDIR;
1045           if (lstat(SockDir, &st))
1046             {
1047               n = (eff_uid == 0 && (real_uid || eff_gid == real_gid)) ? 0755 :
1048                   (eff_gid != real_gid) ? 0775 :
1049 #ifdef S_ISVTX
1050                   0777|S_ISVTX;
1051 #else
1052                   0777;
1053 #endif
1054               if (mkdir(SockDir, n) == -1)
1055                 Panic(errno, "Cannot make directory '%s'", SockDir);
1056             }
1057           else
1058             {
1059               if (!S_ISDIR(st.st_mode))
1060                 Panic(0, "'%s' must be a directory.", SockDir);
1061               if (eff_uid == 0 && real_uid && (int)st.st_uid != eff_uid)
1062                 Panic(0, "Directory '%s' must be owned by root.", SockDir);
1063               n = (eff_uid == 0 && (real_uid || (st.st_mode & 0775) != 0775)) ? 0755 :
1064                   (eff_gid == (int)st.st_gid && eff_gid != real_gid) ? 0775 :
1065                   0777;
1066               if (((int)st.st_mode & 0777) != n)
1067                 Panic(0, "Directory '%s' must have mode %03o.", SockDir, n);
1068             }
1069           sprintf(SockPath, "%s/S-%s", SockDir, LoginName);
1070           if (access(SockPath, F_OK))
1071             {
1072               if (mkdir(SockPath, 0700) == -1)
1073                 Panic(errno, "Cannot make directory '%s'", SockPath);
1074               (void) chown(SockPath, real_uid, real_gid);
1075             }
1076         }
1077 #endif
1078     }
1079
1080   if (stat(SockPath, &st) == -1)
1081     Panic(errno, "Cannot access %s", SockPath);
1082   else
1083   if (!S_ISDIR(st.st_mode))
1084     Panic(0, "%s is not a directory.", SockPath);
1085 #ifdef MULTIUSER
1086   if (multi)
1087     {
1088       if ((int)st.st_uid != multi_uid)
1089         Panic(0, "%s is not the owner of %s.", multi, SockPath);
1090     }
1091   else
1092 #endif
1093     {
1094       if ((int)st.st_uid != real_uid)
1095         Panic(0, "You are not the owner of %s.", SockPath);
1096     }
1097   if ((st.st_mode & 0777) != 0700)
1098     Panic(0, "Directory %s must have mode 700.", SockPath);
1099   if (SockMatch && index(SockMatch, '/'))
1100     Panic(0, "Bad session name '%s'", SockMatch);
1101   SockName = SockPath + strlen(SockPath) + 1;
1102   *SockName = 0;
1103   (void) umask(oumask);
1104   debug2("SockPath: %s  SockMatch: %s\n", SockPath, SockMatch ? SockMatch : "NULL");
1105
1106 #if defined(SYSV) && !defined(ISC)
1107   if (uname(&utsnam) == -1)
1108     Panic(errno, "uname");
1109   strncpy(HostName, utsnam.nodename, sizeof(utsnam.nodename) < MAXSTR ? sizeof(utsnam.nodename) : MAXSTR - 1);
1110   HostName[sizeof(utsnam.nodename) < MAXSTR ? sizeof(utsnam.nodename) : MAXSTR - 1] = '\0';
1111 #else
1112   (void) gethostname(HostName, MAXSTR);
1113   HostName[MAXSTR - 1] = '\0';
1114 #endif
1115   if ((ap = index(HostName, '.')) != NULL)
1116     *ap = '\0';
1117
1118   if (lsflag)
1119     {
1120       int i, fo, oth;
1121
1122 #ifdef MULTIUSER
1123       if (multi)
1124         real_uid = multi_uid;
1125 #endif
1126       SET_GUID();
1127       i = FindSocket((int *)NULL, &fo, &oth, SockMatch);
1128       if (quietflag)
1129         exit(8 + (fo ? ((oth || i) ? 2 : 1) : 0) + i);
1130       if (fo == 0)
1131         Panic(0, "No Sockets found in %s.\n", SockPath);
1132       Panic(0, "%d Socket%s in %s.\n", fo, fo > 1 ? "s" : "", SockPath);
1133       /* NOTREACHED */
1134     }
1135   signal(SIG_BYE, AttacherFinit);       /* prevent races */
1136   if (cmdflag)
1137     {
1138       /* attach_tty is not mandatory */
1139       SET_TTYNAME(0);
1140       if (!*av)
1141         Panic(0, "Please specify a command.");
1142       SET_GUID();
1143       SendCmdMessage(sty, SockMatch, av);
1144       exit(0);
1145     }
1146   else if (rflag || xflag)
1147     {
1148       debug("screen -r: - is there anybody out there?\n");
1149       if (Attach(MSG_ATTACH))
1150         {
1151           Attacher();
1152           /* NOTREACHED */
1153         }
1154 #ifdef MULTIUSER
1155       if (multiattach)
1156         Panic(0, "Can't create sessions of other users.");
1157 #endif
1158       debug("screen -r: backend not responding -- still crying\n");
1159     }
1160   else if (dflag && !mflag)
1161     {
1162       (void) Attach(MSG_DETACH);
1163       Msg(0, "[%s %sdetached.]\n", SockName, (dflag > 1 ? "power " : ""));
1164       eexit(0);
1165       /* NOTREACHED */
1166     }
1167   if (!SockMatch && !mflag && sty)
1168     {
1169       /* attach_tty is not mandatory */
1170       SET_TTYNAME(0);
1171       SET_GUID();
1172       nwin_options.args = av;
1173       SendCreateMsg(sty, &nwin);
1174       exit(0);
1175       /* NOTREACHED */
1176     }
1177   nwin_compose(&nwin_default, &nwin_options, &nwin_default);
1178
1179   if (!detached || dflag != 2)
1180     MasterPid = fork();
1181   else
1182     MasterPid = 0;
1183
1184   switch (MasterPid)
1185     {
1186     case -1:
1187       Panic(errno, "fork");
1188       /* NOTREACHED */
1189     case 0:
1190       break;
1191     default:
1192       if (detached)
1193         exit(0);
1194       if (SockMatch)
1195         sprintf(socknamebuf, "%d.%s", MasterPid, SockMatch);
1196       else
1197         sprintf(socknamebuf, "%d.%s.%s", MasterPid, stripdev(attach_tty), HostName);
1198       for (ap = socknamebuf; *ap; ap++)
1199         if (*ap == '/')
1200           *ap = '-';
1201 #ifdef NAME_MAX
1202       if (strlen(socknamebuf) > NAME_MAX)
1203         socknamebuf[NAME_MAX] = 0;
1204 #endif
1205       sprintf(SockPath + strlen(SockPath), "/%s", socknamebuf);
1206       SET_GUID();
1207       Attacher();
1208       /* NOTREACHED */
1209     }
1210
1211   if (!detached)
1212     PanicPid = getppid();
1213
1214   if (DefaultEsc == -1)
1215     DefaultEsc = Ctrl('a');
1216   if (DefaultMetaEsc == -1)
1217     DefaultMetaEsc = 'a';
1218
1219   ap = av0 + strlen(av0) - 1;
1220   while (ap >= av0)
1221     {
1222       if (!strncmp("screen", ap, 6))
1223         {
1224           strncpy(ap, "SCREEN", 6); /* name this process "SCREEN-BACKEND" */
1225           break;
1226         }
1227       ap--;
1228     }
1229   if (ap < av0)
1230     *av0 = 'S';
1231
1232 #ifdef DEBUG
1233   {
1234     char buf[256];
1235
1236     if (dfp && dfp != stderr)
1237       fclose(dfp);
1238     sprintf(buf, "%s/SCREEN.%d", DEBUGDIR, (int)getpid());
1239     if ((dfp = fopen(buf, "w")) == NULL)
1240       dfp = stderr;
1241     else
1242       (void) chmod(buf, 0666);
1243   }
1244 #endif
1245   if (!detached)
1246     {
1247       if (attach_fd == -1)
1248         {
1249           if ((n = secopen(attach_tty, O_RDWR, 0)) < 0)
1250             Panic(0, "Cannot reopen '%s' - please check.", attach_tty);
1251         }
1252       else
1253         n = dup(attach_fd);
1254     }
1255   else
1256     n = -1;
1257   freopen("/dev/null", "r", stdin);
1258   freopen("/dev/null", "w", stdout);
1259
1260 #ifdef DEBUG
1261   if (dfp != stderr)
1262 #endif
1263   freopen("/dev/null", "w", stderr);
1264   debug("-- screen.back debug started\n");
1265
1266   /*
1267    * This guarantees that the session owner is listed, even when we
1268    * start detached. From now on we should not refer to 'LoginName'
1269    * any more, use users->u_name instead.
1270    */
1271   if (UserAdd(LoginName, (char *)0, (struct acluser **)0) < 0)
1272     Panic(0, "Could not create user info");
1273   if (!detached)
1274     {
1275       if (MakeDisplay(LoginName, attach_tty, attach_term, n, getppid(), &attach_Mode) == 0)
1276         Panic(0, "Could not alloc display");
1277       PanicPid = 0;
1278 #ifdef ENCODINGS
1279       D_encoding = nwin_options.encoding > 0 ? nwin_options.encoding : 0;
1280       debug1("D_encoding = %d\n", D_encoding);
1281 #endif
1282     }
1283
1284   if (SockMatch)
1285     {
1286       /* user started us with -S option */
1287       sprintf(socknamebuf, "%d.%s", (int)getpid(), SockMatch);
1288     }
1289   else
1290     {
1291       sprintf(socknamebuf, "%d.%s.%s", (int)getpid(), stripdev(attach_tty),
1292               HostName);
1293     }
1294   for (ap = socknamebuf; *ap; ap++)
1295     if (*ap == '/')
1296       *ap = '-';
1297 #ifdef NAME_MAX
1298   if (strlen(socknamebuf) > NAME_MAX)
1299     {
1300       debug2("Socketname %s truncated to %d chars\n", socknamebuf, NAME_MAX);
1301       socknamebuf[NAME_MAX] = 0;
1302     }
1303 #endif
1304   sprintf(SockPath + strlen(SockPath), "/%s", socknamebuf);
1305
1306   ServerSocket = MakeServerSocket();
1307   InitKeytab();
1308 #ifdef ETCSCREENRC
1309 # ifdef ALLOW_SYSSCREENRC
1310   if ((ap = getenv("SYSSCREENRC")))
1311     (void)StartRc(ap, 0);
1312   else
1313 # endif
1314     (void)StartRc(ETCSCREENRC, 0);
1315 #endif
1316   (void)StartRc(RcFileName, 0);
1317 # ifdef UTMPOK
1318 #  ifndef UTNOKEEP
1319   InitUtmp();
1320 #  endif /* UTNOKEEP */
1321 # endif /* UTMPOK */
1322   if (display)
1323     {
1324       if (InitTermcap(0, 0))
1325         {
1326           debug("Could not init termcap - exiting\n");
1327           fcntl(D_userfd, F_SETFL, 0);  /* Flush sets FNBLOCK */
1328           freetty();
1329           if (D_userpid)
1330             Kill(D_userpid, SIG_BYE);
1331           eexit(1);
1332         }
1333       MakeDefaultCanvas();
1334       InitTerm(0);
1335 #ifdef UTMPOK
1336       RemoveLoginSlot();
1337 #endif
1338     }
1339   else
1340     MakeTermcap(1);
1341 #ifdef LOADAV
1342   InitLoadav();
1343 #endif /* LOADAV */
1344   MakeNewEnv();
1345   signal(SIGHUP, SigHup);
1346   signal(SIGINT, FinitHandler);
1347   signal(SIGQUIT, FinitHandler);
1348   signal(SIGTERM, FinitHandler);
1349 #ifdef BSDJOBS
1350   signal(SIGTTIN, SIG_IGN);
1351   signal(SIGTTOU, SIG_IGN);
1352 #endif
1353
1354   if (display)
1355     {
1356       brktty(D_userfd);
1357       SetMode(&D_OldMode, &D_NewMode, D_flow, iflag);
1358       /* Note: SetMode must be called _before_ FinishRc. */
1359       SetTTY(D_userfd, &D_NewMode);
1360       if (fcntl(D_userfd, F_SETFL, FNBLOCK))
1361         Msg(errno, "Warning: NBLOCK fcntl failed");
1362     }
1363   else
1364     brktty(-1);         /* just try */
1365   signal(SIGCHLD, SigChld);
1366 #ifdef ETCSCREENRC
1367 # ifdef ALLOW_SYSSCREENRC
1368   if ((ap = getenv("SYSSCREENRC")))
1369     FinishRc(ap);
1370   else
1371 # endif
1372     FinishRc(ETCSCREENRC);
1373 #endif
1374   FinishRc(RcFileName);
1375
1376   debug2("UID %d  EUID %d\n", (int)getuid(), (int)geteuid());
1377   if (windows == NULL)
1378     {
1379       debug("We open one default window, as screenrc did not specify one.\n");
1380       if (MakeWindow(&nwin) == -1)
1381         {
1382           Msg(0, "Sorry, could not find a PTY.");
1383           sleep(5);
1384           Finit(0);
1385           /* NOTREACHED */
1386         }
1387     }
1388
1389 #ifdef HAVE_BRAILLE
1390   StartBraille();
1391 #endif
1392
1393   if (display && default_startup)
1394     display_copyright();
1395   signal(SIGINT, SigInt);
1396   if (rflag && (rflag & 1) == 0 && !quietflag)
1397     {
1398       Msg(0, "New screen...");
1399       rflag = 0;
1400     }
1401
1402   serv_read.type = EV_READ;
1403   serv_read.fd = ServerSocket;
1404   serv_read.handler = serv_read_fn;
1405   evenq(&serv_read);
1406
1407   serv_select.pri = -10;
1408   serv_select.type = EV_ALWAYS;
1409   serv_select.handler = serv_select_fn;
1410   evenq(&serv_select);
1411
1412   logflushev.type = EV_TIMEOUT;
1413   logflushev.handler = logflush_fn;
1414
1415   sched();
1416   /* NOTREACHED */
1417   return 0;
1418 }
1419
1420 void
1421 WindowDied(p, wstat, wstat_valid)
1422 struct win *p;
1423 int wstat;
1424 int wstat_valid;
1425 {
1426   int killit = 0;
1427
1428   if (ZombieKey_destroy && ZombieKey_onerror && wstat_valid &&
1429       WIFEXITED(wstat) && WEXITSTATUS(wstat) == 0)
1430         killit = 1;
1431
1432   if (ZombieKey_destroy && !killit)
1433     {
1434       char buf[100], *s, reason[100];
1435       time_t now;
1436
1437       if (wstat_valid) {
1438         if (WIFEXITED(wstat))
1439           if (WEXITSTATUS(wstat))
1440             sprintf(reason, "terminated with exit status %d", WEXITSTATUS(wstat));
1441           else
1442             sprintf(reason, "terminated normally");
1443         else if (WIFSIGNALED(wstat))
1444           sprintf(reason, "terminated with signal %d%s", WTERMSIG(wstat),
1445 #ifdef WCOREDUMP
1446                           WCOREDUMP(wstat) ? " (core file generated)" : "");
1447 #else
1448                           "");
1449 #endif
1450       } else
1451         sprintf(reason, "detached from window");
1452
1453       (void) time(&now);
1454       s = ctime(&now);
1455       if (s && *s)
1456         s[strlen(s) - 1] = '\0';
1457       debug3("window %d (%s) going into zombie state fd %d",
1458              p->w_number, p->w_title, p->w_ptyfd);
1459 #ifdef UTMPOK
1460       if (p->w_slot != (slot_t)0 && p->w_slot != (slot_t)-1)
1461         {
1462           RemoveUtmp(p);
1463           p->w_slot = 0;        /* "detached" */
1464         }
1465 #endif
1466       CloseDevice(p);
1467
1468       p->w_deadpid = p->w_pid;
1469       p->w_pid = 0;
1470       ResetWindow(p);
1471       /* p->w_y = p->w_bot; */
1472       p->w_y = MFindUsedLine(p, p->w_bot, 1);
1473       sprintf(buf, "\n\r=== Command %s (%s) ===", reason, s ? s : "?");
1474       WriteString(p, buf, strlen(buf));
1475       WindowChanged(p, 'f');
1476     }
1477   else
1478     KillWindow(p);
1479 #ifdef UTMPOK
1480   CarefulUtmp();
1481 #endif
1482 }
1483
1484 static void
1485 SigChldHandler()
1486 {
1487   struct stat st;
1488 #ifdef DEBUG
1489   fds();
1490 #endif
1491   while (GotSigChld)
1492     {
1493       GotSigChld = 0;
1494       DoWait();
1495 #ifdef SYSVSIGS
1496       signal(SIGCHLD, SigChld);
1497 #endif
1498     }
1499   if (stat(SockPath, &st) == -1)
1500     {
1501       debug1("SigChldHandler: Yuck! cannot stat '%s'\n", SockPath);
1502       if (!RecoverSocket())
1503         {
1504           debug("SCREEN cannot recover from corrupt Socket, bye\n");
1505           Finit(1);
1506         }
1507       else
1508         debug1("'%s' reconstructed\n", SockPath);
1509     }
1510   else
1511     debug2("SigChldHandler: stat '%s' o.k. (%03o)\n", SockPath, (int)st.st_mode);
1512 }
1513
1514 static sigret_t
1515 SigChld SIGDEFARG
1516 {
1517   debug("SigChld()\n");
1518   GotSigChld = 1;
1519   SIGRETURN;
1520 }
1521
1522 sigret_t
1523 SigHup SIGDEFARG
1524 {
1525   /* Hangup all displays */
1526   while ((display = displays) != 0)
1527     Hangup();
1528   SIGRETURN;
1529 }
1530
1531 /*
1532  * the backend's Interrupt handler
1533  * we cannot insert the intrc directly, as we never know
1534  * if fore is valid.
1535  */
1536 static sigret_t
1537 SigInt SIGDEFARG
1538 {
1539 #if HAZARDOUS
1540   char ibuf;
1541
1542   debug("SigInt()\n");
1543   if (fore && displays)
1544     {
1545 # if defined(TERMIO) || defined(POSIX)
1546       ibuf = displays->d_OldMode.tio.c_cc[VINTR];
1547 # else
1548       ibuf = displays->d_OldMode.m_tchars.t_intrc;
1549 # endif
1550       fore->w_inlen = 0;
1551       write(fore->w_ptyfd, &ibuf, 1);
1552     }
1553 #else
1554   signal(SIGINT, SigInt);
1555   debug("SigInt() careful\n");
1556   InterruptPlease = 1;
1557 #endif
1558   SIGRETURN;
1559 }
1560
1561 static sigret_t
1562 CoreDump SIGDEFARG
1563 {
1564   struct display *disp;
1565   char buf[80];
1566
1567 #if defined(SYSVSIGS) && defined(SIGHASARG)
1568   signal(sigsig, SIG_IGN);
1569 #endif
1570   setgid(getgid());
1571   setuid(getuid());
1572   unlink("core");
1573 #ifdef SIGHASARG
1574   sprintf(buf, "\r\n[screen caught signal %d.%s]\r\n", sigsig,
1575 #else
1576   sprintf(buf, "\r\n[screen caught a fatal signal.%s]\r\n",
1577 #endif
1578 #if defined(SHADOWPW) && !defined(DEBUG) && !defined(DUMPSHADOW)
1579               ""
1580 #else /* SHADOWPW  && !DEBUG */
1581               " (core dumped)"
1582 #endif /* SHADOWPW  && !DEBUG */
1583               );
1584   for (disp = displays; disp; disp = disp->d_next)
1585     {
1586       fcntl(disp->d_userfd, F_SETFL, 0);
1587       SetTTY(disp->d_userfd, &D_OldMode);
1588       write(disp->d_userfd, buf, strlen(buf));
1589       Kill(disp->d_userpid, SIG_BYE);
1590     }
1591 #if defined(SHADOWPW) && !defined(DEBUG) && !defined(DUMPSHADOW)
1592   Kill(getpid(), SIGKILL);
1593   eexit(11);
1594 #else /* SHADOWPW && !DEBUG */
1595   abort();
1596 #endif /* SHADOWPW  && !DEBUG */
1597   SIGRETURN;
1598 }
1599
1600 static void
1601 DoWait()
1602 {
1603   register int pid;
1604   struct win *p, *next;
1605 #ifdef BSDWAIT
1606   union wait wstat;
1607 #else
1608   int wstat;
1609 #endif
1610
1611 #ifdef BSDJOBS
1612 # ifndef BSDWAIT
1613   while ((pid = waitpid(-1, &wstat, WNOHANG | WUNTRACED)) > 0)
1614 # else
1615 # ifdef USE_WAIT2
1616   /*
1617    * From: rouilj@sni-usa.com (John Rouillard)
1618    * note that WUNTRACED is not documented to work, but it is defined in
1619    * /usr/include/sys/wait.h, so it may work
1620    */
1621   while ((pid = wait2(&wstat, WNOHANG | WUNTRACED )) > 0)
1622 #  else /* USE_WAIT2 */
1623   while ((pid = wait3(&wstat, WNOHANG | WUNTRACED, (struct rusage *) 0)) > 0)
1624 #  endif /* USE_WAIT2 */
1625 # endif
1626 #else   /* BSDJOBS */
1627   while ((pid = wait(&wstat)) < 0)
1628     if (errno != EINTR)
1629       break;
1630   if (pid > 0)
1631 #endif  /* BSDJOBS */
1632     {
1633       for (p = windows; p; p = next)
1634         {
1635           next = p->w_next;
1636           if (  (p->w_pid     && pid == p->w_pid) ||
1637                 (p->w_deadpid && pid == p->w_deadpid) )
1638             {
1639               /* child has ceased to exist */
1640               p->w_pid = 0;
1641
1642 #ifdef BSDJOBS
1643               if (WIFSTOPPED(wstat))
1644                 {
1645                   debug3("Window %d pid %d: WIFSTOPPED (sig %d)\n", p->w_number, pid, WSTOPSIG(wstat));
1646 #ifdef SIGTTIN
1647                   if (WSTOPSIG(wstat) == SIGTTIN)
1648                     {
1649                       Msg(0, "Suspended (tty input)");
1650                       continue;
1651                     }
1652 #endif
1653 #ifdef SIGTTOU
1654                   if (WSTOPSIG(wstat) == SIGTTOU)
1655                     {
1656                       Msg(0, "Suspended (tty output)");
1657                       continue;
1658                     }
1659 #endif
1660                   /* Try to restart process */
1661                   Msg(0, "Child has been stopped, restarting.");
1662                   if (killpg(pid, SIGCONT))
1663                     kill(pid, SIGCONT);
1664                 }
1665               else
1666 #endif
1667                 {
1668                   WindowDied(p, wstat, 1);
1669                 }
1670               break;
1671             }
1672 #ifdef PSEUDOS
1673           if (p->w_pwin && pid == p->w_pwin->p_pid)
1674             {
1675               debug2("pseudo of win Nr %d died. pid == %d\n", p->w_number, p->w_pwin->p_pid);
1676               FreePseudowin(p);
1677               break;
1678             }
1679 #endif
1680         }
1681       if (p == 0)
1682         {
1683           debug1("pid %d not found - hope that's ok\n", pid);
1684         }
1685     }
1686 }
1687
1688
1689 static sigret_t
1690 FinitHandler SIGDEFARG
1691 {
1692 #ifdef SIGHASARG
1693   debug1("FinitHandler called, sig %d.\n", sigsig);
1694 #else
1695   debug("FinitHandler called.\n");
1696 #endif
1697   Finit(1);
1698   SIGRETURN;
1699 }
1700
1701 void
1702 Finit(i)
1703 int i;
1704 {
1705   signal(SIGCHLD, SIG_DFL);
1706   signal(SIGHUP, SIG_IGN);
1707   debug1("Finit(%d);\n", i);
1708   while (windows)
1709     {
1710       struct win *p = windows;
1711       windows = windows->w_next;
1712       FreeWindow(p);
1713     }
1714   if (ServerSocket != -1)
1715     {
1716       debug1("we unlink(%s)\n", SockPath);
1717 #ifdef USE_SETEUID
1718       xseteuid(real_uid);
1719       xsetegid(real_gid);
1720 #endif
1721       (void) unlink(SockPath);
1722 #ifdef USE_SETEUID
1723       xseteuid(eff_uid);
1724       xsetegid(eff_gid);
1725 #endif
1726     }
1727   for (display = displays; display; display = display->d_next)
1728     {
1729       if (D_status)
1730         RemoveStatus();
1731       FinitTerm();
1732 #ifdef UTMPOK
1733       RestoreLoginSlot();
1734 #endif
1735       AddStr("[screen is terminating]\r\n");
1736       Flush();
1737       SetTTY(D_userfd, &D_OldMode);
1738       fcntl(D_userfd, F_SETFL, 0);
1739       freetty();
1740       Kill(D_userpid, SIG_BYE);
1741     }
1742   /*
1743    * we _cannot_ call eexit(i) here,
1744    * instead of playing with the Socket above. Sigh.
1745    */
1746   exit(i);
1747 }
1748
1749 void
1750 eexit(e)
1751 int e;
1752 {
1753   debug("eexit\n");
1754   if (ServerSocket != -1)
1755     {
1756       debug1("we unlink(%s)\n", SockPath);
1757       setgid(real_gid);
1758       setuid(real_uid);
1759       (void) unlink(SockPath);
1760     }
1761   exit(e);
1762 }
1763
1764 void
1765 Hangup()
1766 {
1767   if (display == 0)
1768     return;
1769   debug1("Hangup %x\n", display);
1770   if (D_userfd >= 0)
1771     {
1772       close(D_userfd);
1773       D_userfd = -1;
1774     }
1775   if (auto_detach || displays->d_next)
1776     Detach(D_HANGUP);
1777   else
1778     Finit(0);
1779 }
1780
1781 /*
1782  * Detach now has the following modes:
1783  *D_DETACH       SIG_BYE        detach backend and exit attacher
1784  *D_HANGUP       SIG_BYE        detach backend and exit attacher
1785  *D_STOP         SIG_STOP       stop attacher (and detach backend)
1786  *D_REMOTE       SIG_BYE        remote detach -- reattach to new attacher
1787  *D_POWER        SIG_POWER_BYE  power detach -- attacher kills his parent
1788  *D_REMOTE_POWER SIG_POWER_BYE  remote power detach -- both
1789  *D_LOCK         SIG_LOCK       lock the attacher
1790  * (jw)
1791  * we always remove our utmp slots. (even when "lock" or "stop")
1792  * Note: Take extra care here, we may be called by interrupt!
1793  */
1794 void
1795 Detach(mode)
1796 int mode;
1797 {
1798   int sign = 0, pid;
1799   struct canvas *cv;
1800   struct win *p;
1801
1802   if (display == 0)
1803     return;
1804
1805   signal(SIGHUP, SIG_IGN);
1806   debug1("Detach(%d)\n", mode);
1807   if (D_status)
1808     RemoveStatus();
1809   FinitTerm();
1810   if (!display)
1811     return;
1812   switch (mode)
1813     {
1814     case D_HANGUP:
1815       sign = SIG_BYE;
1816       break;
1817     case D_DETACH:
1818       AddStr("[detached]\r\n");
1819       sign = SIG_BYE;
1820       break;
1821 #ifdef BSDJOBS
1822     case D_STOP:
1823       sign = SIG_STOP;
1824       break;
1825 #endif
1826 #ifdef REMOTE_DETACH
1827     case D_REMOTE:
1828       AddStr("[remote detached]\r\n");
1829       sign = SIG_BYE;
1830       break;
1831 #endif
1832 #ifdef POW_DETACH
1833     case D_POWER:
1834       AddStr("[power detached]\r\n");
1835       if (PowDetachString)
1836         {
1837           AddStr(PowDetachString);
1838           AddStr("\r\n");
1839         }
1840       sign = SIG_POWER_BYE;
1841       break;
1842 #ifdef REMOTE_DETACH
1843     case D_REMOTE_POWER:
1844       AddStr("[remote power detached]\r\n");
1845       if (PowDetachString)
1846         {
1847           AddStr(PowDetachString);
1848           AddStr("\r\n");
1849         }
1850       sign = SIG_POWER_BYE;
1851       break;
1852 #endif
1853 #endif
1854     case D_LOCK:
1855       ClearAll();
1856       sign = SIG_LOCK;
1857       /* tell attacher to lock terminal with a lockprg. */
1858       break;
1859     }
1860 #ifdef UTMPOK
1861   if (displays->d_next == 0)
1862     {
1863       for (p = windows; p; p = p->w_next)
1864         {
1865           if (p->w_slot != (slot_t) -1 && !(p->w_lflag & 2))
1866             {
1867               RemoveUtmp(p);
1868               /*
1869                * Set the slot to 0 to get the window
1870                * logged in again.
1871                */
1872               p->w_slot = (slot_t) 0;
1873             }
1874         }
1875     }
1876   if (mode != D_HANGUP)
1877     RestoreLoginSlot();
1878 #endif
1879   if (displays->d_next == 0 && console_window)
1880     {
1881       if (TtyGrabConsole(console_window->w_ptyfd, 0, "detach"))
1882         {
1883           debug("could not release console - killing window\n");
1884           KillWindow(console_window);
1885           display = displays;           /* restore display */
1886         }
1887     }
1888   if (D_fore)
1889     {
1890 #ifdef MULTIUSER
1891       ReleaseAutoWritelock(display, D_fore);
1892 #endif
1893       D_user->u_detachwin = D_fore->w_number;
1894       D_user->u_detachotherwin = D_other ? D_other->w_number : -1;
1895     }
1896   AutosaveLayout(D_layout);
1897   layout_last = D_layout;
1898   for (cv = D_cvlist; cv; cv = cv->c_next)
1899     {
1900       p = Layer2Window(cv->c_layer);
1901       SetCanvasWindow(cv, 0);
1902       if (p)
1903         WindowChanged(p, 'u');
1904     }
1905
1906   pid = D_userpid;
1907   debug2("display: %#x displays: %#x\n", (unsigned int)display, (unsigned int)displays);
1908   FreeDisplay();
1909   if (displays == 0)
1910     /* Flag detached-ness */
1911     (void) chsock();
1912   /*
1913    * tell father what to do. We do that after we
1914    * freed the tty, thus getty feels more comfortable on hpux
1915    * if it was a power detach.
1916    */
1917   Kill(pid, sign);
1918   debug2("Detach: Signal %d to Attacher(%d)!\n", sign, pid);
1919   debug("Detach returns, we are successfully detached.\n");
1920   signal(SIGHUP, SigHup);
1921 }
1922
1923 static int
1924 IsSymbol(e, s)
1925 char *e, *s;
1926 {
1927   register int l;
1928
1929   l = strlen(s);
1930   return strncmp(e, s, l) == 0 && e[l] == '=';
1931 }
1932
1933 void
1934 MakeNewEnv()
1935 {
1936   register char **op, **np;
1937   static char stybuf[MAXSTR];
1938
1939   for (op = environ; *op; ++op)
1940     ;
1941   if (NewEnv)
1942     free((char *)NewEnv);
1943   NewEnv = np = (char **) malloc((unsigned) (op - environ + 7 + 1) * sizeof(char **));
1944   if (!NewEnv)
1945     Panic(0, strnomem);
1946   sprintf(stybuf, "STY=%s", strlen(SockName) <= MAXSTR - 5 ? SockName : "?");
1947   *np++ = stybuf;                       /* NewEnv[0] */
1948   *np++ = Term;                 /* NewEnv[1] */
1949   np++;         /* room for SHELL */
1950 #ifdef TIOCSWINSZ
1951   np += 2;      /* room for TERMCAP and WINDOW */
1952 #else
1953   np += 4;      /* room for TERMCAP WINDOW LINES COLUMNS */
1954 #endif
1955
1956   for (op = environ; *op; ++op)
1957     {
1958       if (!IsSymbol(*op, "TERM") && !IsSymbol(*op, "TERMCAP")
1959           && !IsSymbol(*op, "STY") && !IsSymbol(*op, "WINDOW")
1960           && !IsSymbol(*op, "SCREENCAP") && !IsSymbol(*op, "SHELL")
1961           && !IsSymbol(*op, "LINES") && !IsSymbol(*op, "COLUMNS")
1962          )
1963         *np++ = *op;
1964     }
1965   *np = 0;
1966 }
1967
1968 void
1969 /*VARARGS2*/
1970 #if defined(USEVARARGS) && defined(__STDC__)
1971 Msg(int err, char *fmt, VA_DOTS)
1972 #else
1973 Msg(err, fmt, VA_DOTS)
1974 int err;
1975 char *fmt;
1976 VA_DECL
1977 #endif
1978 {
1979   VA_LIST(ap)
1980   char buf[MAXPATHLEN*2];
1981   char *p = buf;
1982
1983   VA_START(ap, fmt);
1984   fmt = DoNLS(fmt);
1985   (void)vsnprintf(p, sizeof(buf) - 100, fmt, VA_ARGS(ap));
1986   VA_END(ap);
1987   if (err)
1988     {
1989       p += strlen(p);
1990       *p++ = ':';
1991       *p++ = ' ';
1992       strncpy(p, strerror(err), buf + sizeof(buf) - p - 1);
1993       buf[sizeof(buf) - 1] = 0;
1994     }
1995   debug2("Msg('%s') (%#x);\n", buf, (unsigned int)display);
1996
1997   if (display && displays)
1998     MakeStatus(buf);
1999   else if (displays)
2000     {
2001       for (display = displays; display; display = display->d_next)
2002         MakeStatus(buf);
2003     }
2004   else if (display)
2005     {
2006       /* no displays but a display - must have forked.
2007        * send message to backend!
2008        */
2009       char *tty = D_usertty;
2010       struct display *olddisplay = display;
2011       display = 0;      /* only send once */
2012       SendErrorMsg(tty, buf);
2013       display = olddisplay;
2014     }
2015   else
2016     printf("%s\r\n", buf);
2017 }
2018
2019 /*
2020  * Call FinitTerm for all displays, write a message to each and call eexit();
2021  */
2022 void
2023 /*VARARGS2*/
2024 #if defined(USEVARARGS) && defined(__STDC__)
2025 Panic(int err, char *fmt, VA_DOTS)
2026 #else
2027 Panic(err, fmt, VA_DOTS)
2028 int err;
2029 char *fmt;
2030 VA_DECL
2031 #endif
2032 {
2033   VA_LIST(ap)
2034   char buf[MAXPATHLEN*2];
2035   char *p = buf;
2036
2037   VA_START(ap, fmt);
2038   fmt = DoNLS(fmt);
2039   (void)vsnprintf(p, sizeof(buf) - 100, fmt, VA_ARGS(ap));
2040   VA_END(ap);
2041   if (err)
2042     {
2043       p += strlen(p);
2044       *p++ = ':';
2045       *p++ = ' ';
2046       strncpy(p, strerror(err), buf + sizeof(buf) - p - 1);
2047       buf[sizeof(buf) - 1] = 0;
2048     }
2049   debug3("Panic('%s'); display=%x displays=%x\n", buf, display, displays);
2050   if (displays == 0 && display == 0)
2051     {
2052       printf("%s\r\n", buf);
2053       if (PanicPid)
2054         Kill(PanicPid, SIG_BYE);
2055     }
2056   else if (displays == 0)
2057     {
2058       /* no displays but a display - must have forked.
2059        * send message to backend!
2060        */
2061       char *tty = D_usertty;
2062       display = 0;
2063       SendErrorMsg(tty, buf);
2064       sleep(2);
2065       _exit(1);
2066     }
2067   else
2068     for (display = displays; display; display = display->d_next)
2069       {
2070         if (D_status)
2071           RemoveStatus();
2072         FinitTerm();
2073         Flush();
2074 #ifdef UTMPOK
2075         RestoreLoginSlot();
2076 #endif
2077         SetTTY(D_userfd, &D_OldMode);
2078         fcntl(D_userfd, F_SETFL, 0);
2079         write(D_userfd, buf, strlen(buf));
2080         write(D_userfd, "\n", 1);
2081         freetty();
2082         if (D_userpid)
2083           Kill(D_userpid, SIG_BYE);
2084       }
2085 #ifdef MULTIUSER
2086   if (tty_oldmode >= 0)
2087     {
2088 # ifdef USE_SETEUID
2089       if (setuid(own_uid))
2090         xseteuid(own_uid);      /* may be a loop. sigh. */
2091 # else
2092       setuid(own_uid);
2093 # endif
2094       debug1("Panic: changing back modes from %s\n", attach_tty);
2095       chmod(attach_tty, tty_oldmode);
2096     }
2097 #endif
2098   eexit(1);
2099 }
2100
2101
2102 /*
2103  * '^' is allowed as an escape mechanism for control characters. jw.
2104  *
2105  * Added time insertion using ideas/code from /\ndy Jones
2106  *   (andy@lingua.cltr.uq.OZ.AU) - thanks a lot!
2107  *
2108  */
2109
2110 #ifndef USE_LOCALE
2111 static const char days[]   = "SunMonTueWedThuFriSat";
2112 static const char months[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
2113 #endif
2114
2115 static char winmsg_buf[MAXSTR];
2116 #define MAX_WINMSG_REND 16      /* rendition changes */
2117 static int winmsg_rend[MAX_WINMSG_REND];
2118 static int winmsg_rendpos[MAX_WINMSG_REND];
2119 static int winmsg_numrend;
2120
2121 static char *
2122 pad_expand(buf, p, numpad, padlen)
2123 char *buf;
2124 char *p;
2125 int numpad;
2126 int padlen;
2127 {
2128   char *pn, *pn2;
2129   int i, r;
2130
2131   padlen = padlen - (p - buf);  /* space for rent */
2132   if (padlen < 0)
2133     padlen = 0;
2134   pn2 = pn = p + padlen;
2135   r = winmsg_numrend;
2136   while (p >= buf)
2137     {
2138       if (r && p - buf == winmsg_rendpos[r - 1])
2139         {
2140           winmsg_rendpos[--r] = pn - buf;
2141           continue;
2142         }
2143       *pn-- = *p;
2144       if (*p-- == 127)
2145         {
2146           pn[1] = ' ';
2147           i = numpad > 0 ? (padlen + numpad - 1) / numpad : 0;
2148           padlen -= i;
2149           while (i-- > 0)
2150             *pn-- = ' ';
2151           numpad--;
2152         }
2153     }
2154   return pn2;
2155 }
2156
2157 struct backtick {
2158   struct backtick *next;
2159   int num;
2160   int tick;
2161   int lifespan;
2162   time_t bestbefore;
2163   char result[MAXSTR];
2164   char **cmdv;
2165   struct event ev;
2166   char *buf;
2167   int bufi;
2168 };
2169
2170 struct backtick *backticks;
2171
2172 static void
2173 backtick_filter(bt)
2174 struct backtick *bt;
2175 {
2176   char *p, *q;
2177   int c;
2178
2179   for (p = q = bt->result; (c = (unsigned char)*p++) != 0;)
2180     {
2181       if (c == '\t')
2182         c = ' ';
2183       if (c >= ' ' || c == '\005')
2184         *q++ = c;
2185     }
2186   *q = 0;
2187 }
2188
2189 static void
2190 backtick_fn(ev, data)
2191 struct event *ev;
2192 char *data;
2193 {
2194   struct backtick *bt;
2195   int i, j, k, l;
2196
2197   bt = (struct backtick *)data;
2198   debug1("backtick_fn for #%d\n", bt->num);
2199   i = bt->bufi;
2200   l = read(ev->fd, bt->buf + i, MAXSTR - i);
2201   if (l <= 0)
2202     {
2203       debug1("EOF on backtick #%d\n", bt->num);
2204       evdeq(ev);
2205       close(ev->fd);
2206       ev->fd = -1;
2207       return;
2208     }
2209   debug1("read %d bytes\n", l);
2210   i += l;
2211   for (j = 0; j < l; j++)
2212     if (bt->buf[i - j - 1] == '\n')
2213       break;
2214   if (j < l)
2215     {
2216       for (k = i - j - 2; k >= 0; k--)
2217         if (bt->buf[k] == '\n')
2218           break;
2219       k++;
2220       bcopy(bt->buf + k, bt->result, i - j - k);
2221       bt->result[i - j - k - 1] = 0;
2222       backtick_filter(bt);
2223       WindowChanged(0, '`');
2224     }
2225   if (j == l && i == MAXSTR)
2226     {
2227       j = MAXSTR/2;
2228       l = j + 1;
2229     }
2230   if (j < l)
2231     {
2232       if (j)
2233         bcopy(bt->buf + i - j, bt->buf, j);
2234       i = j;
2235     }
2236   bt->bufi = i;
2237 }
2238
2239 void
2240 setbacktick(num, lifespan, tick, cmdv)
2241 int num;
2242 int lifespan;
2243 int tick;
2244 char **cmdv;
2245 {
2246   struct backtick **btp, *bt;
2247   char **v;
2248
2249   debug1("setbacktick called for backtick #%d\n", num);
2250   for (btp = &backticks; (bt = *btp) != 0; btp = &bt->next)
2251     if (bt->num == num)
2252       break;
2253   if (!bt && !cmdv)
2254     return;
2255   if (bt)
2256     {
2257       for (v = bt->cmdv; *v; v++)
2258         free(*v);
2259       free(bt->cmdv);
2260       if (bt->buf)
2261         free(bt->buf);
2262       if (bt->ev.fd >= 0)
2263         close(bt->ev.fd);
2264       evdeq(&bt->ev);
2265     }
2266   if (bt && !cmdv)
2267     {
2268       *btp = bt->next;
2269       free(bt);
2270       return;
2271     }
2272   if (!bt)
2273     {
2274       bt = (struct backtick *)malloc(sizeof *bt);
2275       if (!bt)
2276         {
2277           Msg(0, strnomem);
2278           return;
2279         }
2280       bzero(bt, sizeof(*bt));
2281       bt->next = 0;
2282       *btp = bt;
2283     }
2284   bt->num = num;
2285   bt->tick = tick;
2286   bt->lifespan = lifespan;
2287   bt->bestbefore = 0;
2288   bt->result[0] = 0;
2289   bt->buf = 0;
2290   bt->bufi = 0;
2291   bt->cmdv = cmdv;
2292   bt->ev.fd = -1;
2293   if (bt->tick == 0 && bt->lifespan == 0)
2294     {
2295       debug("setbacktick: continuous mode\n");
2296       bt->buf = (char *)malloc(MAXSTR);
2297       if (bt->buf == 0)
2298         {
2299           Msg(0, strnomem);
2300           setbacktick(num, 0, 0, (char **)0);
2301           return;
2302         }
2303       bt->ev.type = EV_READ;
2304       bt->ev.fd = readpipe(bt->cmdv);
2305       bt->ev.handler = backtick_fn;
2306       bt->ev.data = (char *)bt;
2307       if (bt->ev.fd >= 0)
2308         evenq(&bt->ev);
2309     }
2310 }
2311
2312 static char *
2313 runbacktick(bt, tickp, now)
2314 struct backtick *bt;
2315 int *tickp;
2316 time_t now;
2317 {
2318   int f, i, l, j;
2319   time_t now2;
2320
2321   debug1("runbacktick called for backtick #%d\n", bt->num);
2322   if (bt->tick && (!*tickp || bt->tick < *tickp))
2323     *tickp = bt->tick;
2324   if ((bt->lifespan == 0 && bt->tick == 0) || now < bt->bestbefore)
2325     {
2326       debug1("returning old result (%d)\n", bt->lifespan);
2327       return bt->result;
2328     }
2329   f = readpipe(bt->cmdv);
2330   if (f == -1)
2331     return bt->result;
2332   i = 0;
2333   while ((l = read(f, bt->result + i, sizeof(bt->result) - i)) > 0)
2334     {
2335       debug1("runbacktick: read %d bytes\n", l);
2336       i += l;
2337       for (j = 1; j < l; j++)
2338         if (bt->result[i - j - 1] == '\n')
2339           break;
2340       if (j == l && i == sizeof(bt->result))
2341         {
2342           j = sizeof(bt->result) / 2;
2343           l = j + 1;
2344         }
2345       if (j < l)
2346         {
2347           bcopy(bt->result + i - j, bt->result, j);
2348           i = j;
2349         }
2350     }
2351   close(f);
2352   bt->result[sizeof(bt->result) - 1] = '\n';
2353   if (i && bt->result[i - 1] == '\n')
2354     i--;
2355   debug1("runbacktick: finished, %d bytes\n", i);
2356   bt->result[i] = 0;
2357   backtick_filter(bt);
2358   (void)time(&now2);
2359   bt->bestbefore = now2 + bt->lifespan;
2360   return bt->result;
2361 }
2362
2363 char *
2364 MakeWinMsgEv(str, win, esc, padlen, ev, rec)
2365 char *str;
2366 struct win *win;
2367 int esc;
2368 int padlen;
2369 struct event *ev;
2370 int rec;
2371 {
2372   static int tick;
2373   char *s = str;
2374   register char *p = winmsg_buf;
2375   register int ctrl;
2376   struct timeval now;
2377   struct tm *tm;
2378   int l, i, r;
2379   int num;
2380   int zeroflg;
2381   int longflg;
2382   int minusflg;
2383   int plusflg;
2384   int qmflag = 0, omflag = 0, qmnumrend = 0;
2385   char *qmpos = 0;
2386   int numpad = 0;
2387   int lastpad = 0;
2388   int truncpos = -1;
2389   int truncper = 0;
2390   int trunclong = 0;
2391   struct backtick *bt;
2392
2393   if (winmsg_numrend >= 0)
2394     winmsg_numrend = 0;
2395   else
2396     winmsg_numrend = -winmsg_numrend;
2397
2398   tick = 0;
2399   tm = 0;
2400   ctrl = 0;
2401   gettimeofday(&now, NULL);
2402   for (; *s && (l = winmsg_buf + MAXSTR - 1 - p) > 0; s++, p++)
2403     {
2404       *p = *s;
2405       if (ctrl)
2406         {
2407           ctrl = 0;
2408           if (*s != '^' && *s >= 64)
2409             *p &= 0x1f;
2410           continue;
2411         }
2412       if (*s != esc)
2413         {
2414           if (esc == '%')
2415             {
2416               switch (*s)
2417                 {
2418 #if 0
2419                 case '~':
2420                   *p = BELL;
2421                   break;
2422 #endif
2423                 case '^':
2424                   ctrl = 1;
2425                   *p-- = '^';
2426                   break;
2427                 default:
2428                   break;
2429                 }
2430             }
2431           continue;
2432         }
2433       if (*++s == esc)  /* double escape ? */
2434         continue;
2435       if ((plusflg = *s == '+') != 0)
2436         s++;
2437       if ((minusflg = *s == '-') != 0)
2438         s++;
2439       if ((zeroflg = *s == '0') != 0)
2440         s++;
2441       num = 0;
2442       while(*s >= '0' && *s <= '9')
2443         num = num * 10 + (*s++ - '0');
2444       if ((longflg = *s == 'L') != 0)
2445         s++;
2446       switch (*s)
2447         {
2448         case '?':
2449           p--;
2450           if (qmpos)
2451             {
2452               if ((!qmflag && !omflag) || omflag == 1)
2453                 {
2454                   p = qmpos;
2455                   if (qmnumrend < winmsg_numrend)
2456                     winmsg_numrend = qmnumrend;
2457                 }
2458               qmpos = 0;
2459               break;
2460             }
2461           qmpos = p;
2462           qmnumrend = winmsg_numrend;
2463           qmflag = omflag = 0;
2464           break;
2465         case ':':
2466           p--;
2467           if (!qmpos)
2468             break;
2469           if (qmflag && omflag != 1)
2470             {
2471               omflag = 1;
2472               qmpos = p;
2473               qmnumrend = winmsg_numrend;
2474             }
2475           else
2476             {
2477               p = qmpos;
2478               if (qmnumrend < winmsg_numrend)
2479                 winmsg_numrend = qmnumrend;
2480               omflag = -1;
2481             }
2482           break;
2483         case 'd': case 'D': case 'm': case 'M': case 'y': case 'Y':
2484         case 'a': case 'A': case 's': case 'c': case 'C':
2485           if (l < 4)
2486             break;
2487           if (tm == 0)
2488             {
2489               time_t nowsec = now.tv_sec;
2490               tm = localtime(&nowsec);
2491             }
2492           qmflag = 1;
2493           if (!tick || tick > 3600)
2494             tick = 3600;
2495           switch (*s)
2496             {
2497             case 'd':
2498               sprintf(p, "%02d", tm->tm_mday % 100);
2499               break;
2500             case 'D':
2501 #ifdef USE_LOCALE
2502               strftime(p, l, (longflg ? "%A" : "%a"), tm);
2503 #else
2504               sprintf(p, "%3.3s", days + 3 * tm->tm_wday);
2505 #endif
2506               break;
2507             case 'm':
2508               sprintf(p, "%02d", tm->tm_mon + 1);
2509               break;
2510             case 'M':
2511 #ifdef USE_LOCALE
2512               strftime(p, l, (longflg ? "%B" : "%b"), tm);
2513 #else
2514               sprintf(p, "%3.3s", months + 3 * tm->tm_mon);
2515 #endif
2516               break;
2517             case 'y':
2518               sprintf(p, "%02d", tm->tm_year % 100);
2519               break;
2520             case 'Y':
2521               sprintf(p, "%04d", tm->tm_year + 1900);
2522               break;
2523             case 'a':
2524               sprintf(p, tm->tm_hour >= 12 ? "pm" : "am");
2525               break;
2526             case 'A':
2527               sprintf(p, tm->tm_hour >= 12 ? "PM" : "AM");
2528               break;
2529             case 's':
2530               sprintf(p, "%02d", tm->tm_sec);
2531               tick = 1;
2532               break;
2533             case 'c':
2534               sprintf(p, zeroflg ? "%02d:%02d" : "%2d:%02d", tm->tm_hour, tm->tm_min);
2535               if (!tick || tick > 60)
2536                 tick = 60;
2537               break;
2538             case 'C':
2539               sprintf(p, zeroflg ? "%02d:%02d" : "%2d:%02d", (tm->tm_hour + 11) % 12 + 1, tm->tm_min);
2540               if (!tick || tick > 60)
2541                 tick = 60;
2542               break;
2543             default:
2544               break;
2545             }
2546           p += strlen(p) - 1;
2547           break;
2548         case 'l':
2549 #ifdef LOADAV
2550           *p = 0;
2551           if (l > 20)
2552             AddLoadav(p);
2553           if (*p)
2554             {
2555               qmflag = 1;
2556               p += strlen(p) - 1;
2557             }
2558           else
2559             *p = '?';
2560           if (!tick || tick > 60)
2561             tick = 60;
2562 #else
2563           *p = '?';
2564 #endif
2565           p += strlen(p) - 1;
2566           break;
2567         case '`':
2568         case 'h':
2569           if (rec >= 10 || (*s == 'h' && (win == 0 || win->w_hstatus == 0 || *win->w_hstatus == 0)))
2570             {
2571               p--;
2572               break;
2573             }
2574           if (*s == '`')
2575             {
2576               for (bt = backticks; bt; bt = bt->next)
2577                 if (bt->num == num)
2578                   break;
2579               if (bt == 0)
2580                 {
2581                   p--;
2582                   break;
2583                 }
2584             }
2585             {
2586               char savebuf[sizeof(winmsg_buf)];
2587               int oldtick = tick;
2588               int oldnumrend = winmsg_numrend;
2589
2590               *p = 0;
2591               strcpy(savebuf, winmsg_buf);
2592               winmsg_numrend = -winmsg_numrend;
2593               MakeWinMsgEv(*s == 'h' ? win->w_hstatus : runbacktick(bt, &oldtick, now.tv_sec), win, '\005', 0, (struct event *)0, rec + 1);
2594               debug2("oldtick=%d tick=%d\n", oldtick, tick);
2595               if (!tick || oldtick < tick)
2596                 tick = oldtick;
2597               if ((int)strlen(winmsg_buf) < l)
2598                 strcat(savebuf, winmsg_buf);
2599               strcpy(winmsg_buf, savebuf);
2600               while (oldnumrend < winmsg_numrend)
2601                 winmsg_rendpos[oldnumrend++] += p - winmsg_buf;
2602               if (*p)
2603                 qmflag = 1;
2604               p += strlen(p) - 1;
2605             }
2606           break;
2607         case 'w':
2608         case 'W':
2609           {
2610             struct win *oldfore = 0;
2611             char *ss;
2612
2613             if (display)
2614               {
2615                 oldfore = D_fore;
2616                 D_fore = win;
2617               }
2618             ss = AddWindows(p, l - 1, (*s == 'w' ? 0 : 1) | (longflg ? 0 : 2) | (plusflg ? 4 : 0), win ? win->w_number : -1);
2619             if (minusflg)
2620                *ss = 0;
2621             if (display)
2622               D_fore = oldfore;
2623           }
2624           if (*p)
2625             qmflag = 1;
2626           p += strlen(p) - 1;
2627           break;
2628         case 'u':
2629           *p = 0;
2630           if (win)
2631             AddOtherUsers(p, l - 1, win);
2632           if (*p)
2633             qmflag = 1;
2634           p += strlen(p) - 1;
2635           break;
2636         case 'f':
2637           *p = 0;
2638           if (win)
2639             AddWindowFlags(p, l - 1, win);
2640           if (*p)
2641             qmflag = 1;
2642           p += strlen(p) - 1;
2643           break;
2644         case 't':
2645           *p = 0;
2646           if (win && (int)strlen(win->w_title) < l)
2647             {
2648               strcpy(p, win->w_title);
2649               if (*p)
2650                 qmflag = 1;
2651             }
2652           p += strlen(p) - 1;
2653           break;
2654         case '{':
2655           {
2656             char rbuf[128];
2657             s++;
2658             for (i = 0; i < 127; i++)
2659               if (s[i] && s[i] != '}')
2660                 rbuf[i] = s[i];
2661               else
2662                 break;
2663             if (s[i] == '}' && winmsg_numrend < MAX_WINMSG_REND)
2664               {
2665                 r = -1;
2666                 rbuf[i] = 0;
2667                 debug1("MakeWinMsg attrcolor %s\n", rbuf);
2668                 if (i != 1 || rbuf[0] != '-')
2669                   r = ParseAttrColor(rbuf, (char *)0, 0);
2670                 if (r != -1 || (i == 1 && rbuf[0] == '-'))
2671                   {
2672                     winmsg_rend[winmsg_numrend] = r;
2673                     winmsg_rendpos[winmsg_numrend] = p - winmsg_buf;
2674                     winmsg_numrend++;
2675                   }
2676               }
2677             s += i;
2678             p--;
2679           }
2680           break;
2681         case 'H':
2682           *p = 0;
2683           if ((int)strlen(HostName) < l)
2684             {
2685               strcpy(p, HostName);
2686               if (*p)
2687                 qmflag = 1;
2688             }
2689           p += strlen(p) - 1;
2690           break;
2691         case 'S':
2692           {
2693             char *session_name;
2694             *p = 0;
2695             session_name = strchr(SockName, '.') + 1;
2696             if ((int)strlen(session_name) < l)
2697               {
2698                 strcpy(p, session_name);
2699                 if (*p)
2700                   qmflag = 1;
2701               }
2702             p += strlen(p) - 1;
2703           }
2704           break;
2705         case 'F':
2706           p--;
2707           /* small hack */
2708           if (display && ((ev && ev == &D_forecv->c_captev) || (!ev && win && win == D_fore)))
2709             minusflg = !minusflg;
2710           if (minusflg)
2711             qmflag = 1;
2712           break;
2713         case '>':
2714           truncpos = p - winmsg_buf;
2715           truncper = num > 100 ? 100 : num;
2716           trunclong = longflg;
2717           p--;
2718           break;
2719         case '=':
2720         case '<':
2721           *p = ' ';
2722           if (num || zeroflg || plusflg || longflg || (*s != '='))
2723             {
2724               /* expand all pads */
2725               if (minusflg)
2726                 {
2727                   num = (plusflg ? lastpad : padlen) - num;
2728                   if (!plusflg && padlen == 0)
2729                     num = p - winmsg_buf;
2730                   plusflg = 0;
2731                 }
2732               else if (!zeroflg)
2733                 {
2734                   if (*s != '=' && num == 0 && !plusflg)
2735                     num = 100;
2736                   if (num > 100)
2737                     num = 100;
2738                   if (padlen == 0)
2739                     num = p - winmsg_buf;
2740                   else
2741                     num = (padlen - (plusflg ? lastpad : 0)) * num / 100;
2742                 }
2743               if (num < 0)
2744                 num = 0;
2745               if (plusflg)
2746                 num += lastpad;
2747               if (num > MAXSTR - 1)
2748                 num = MAXSTR - 1;
2749               if (numpad)
2750                 p = pad_expand(winmsg_buf, p, numpad, num);
2751               numpad = 0;
2752               if (p - winmsg_buf > num && !longflg)
2753                 {
2754                   int left, trunc;
2755
2756                   if (truncpos == -1)
2757                     {
2758                       truncpos = lastpad;
2759                       truncper = 0;
2760                     }
2761                   trunc = lastpad + truncper * (num - lastpad) / 100;
2762                   if (trunc > num)
2763                     trunc = num;
2764                   if (trunc < lastpad)
2765                     trunc = lastpad;
2766                   left = truncpos - trunc;
2767                   if (left > p - winmsg_buf - num)
2768                     left = p - winmsg_buf - num;
2769                   debug1("lastpad = %d, ", lastpad);
2770                   debug3("truncpos = %d, trunc = %d, left = %d\n", truncpos, trunc, left);
2771                   if (left > 0)
2772                     {
2773                       if (left + lastpad > p - winmsg_buf)
2774                         left = p - winmsg_buf - lastpad;
2775                       if (p - winmsg_buf - lastpad - left > 0)
2776                         bcopy(winmsg_buf + lastpad + left, winmsg_buf + lastpad,  p - winmsg_buf - lastpad - left);
2777                       p -= left;
2778                       r = winmsg_numrend;
2779                       while (r && winmsg_rendpos[r - 1] > lastpad)
2780                         {
2781                           r--;
2782                           winmsg_rendpos[r] -= left;
2783                           if (winmsg_rendpos[r] < lastpad)
2784                             winmsg_rendpos[r] = lastpad;
2785                         }
2786                       if (trunclong)
2787                         {
2788                           if (p - winmsg_buf > lastpad)
2789                             winmsg_buf[lastpad] = '.';
2790                           if (p - winmsg_buf > lastpad + 1)
2791                             winmsg_buf[lastpad + 1] = '.';
2792                           if (p - winmsg_buf > lastpad + 2)
2793                             winmsg_buf[lastpad + 2] = '.';
2794                         }
2795                     }
2796                   if (p - winmsg_buf > num)
2797                     {
2798                       p = winmsg_buf + num;
2799                       if (trunclong)
2800                         {
2801                           if (num - 1 >= lastpad)
2802                             p[-1] = '.';
2803                           if (num - 2 >= lastpad)
2804                             p[-2] = '.';
2805                           if (num - 3 >= lastpad)
2806                             p[-3] = '.';
2807                         }
2808                       r = winmsg_numrend;
2809                       while (r && winmsg_rendpos[r - 1] > num)
2810                         winmsg_rendpos[--r] = num;
2811                     }
2812                   truncpos = -1;
2813                   trunclong = 0;
2814                   if (lastpad > p - winmsg_buf)
2815                     lastpad = p - winmsg_buf;
2816                   debug1("lastpad now %d\n", lastpad);
2817                 }
2818               if (*s == '=')
2819                 {
2820                   while (p - winmsg_buf < num)
2821                     *p++ = ' ';
2822                   lastpad = p - winmsg_buf;
2823                   truncpos = -1;
2824                   trunclong = 0;
2825                   debug1("lastpad2 now %d\n", lastpad);
2826                 }
2827               p--;
2828             }
2829           else if (padlen)
2830             {
2831               *p = 127;         /* internal pad representation */
2832               numpad++;
2833             }
2834           break;
2835         case 'n':
2836           s++;
2837           /* FALLTHROUGH */
2838         default:
2839           s--;
2840           if (l > 10 + num)
2841             {
2842               if (num == 0)
2843                 num = 1;
2844               if (!win)
2845                 sprintf(p, "%*s", num, num > 1 ? "--" : "-");
2846               else
2847                 sprintf(p, "%*d", num, win->w_number);
2848               qmflag = 1;
2849               p += strlen(p) - 1;
2850             }
2851           break;
2852         }
2853     }
2854   if (qmpos && !qmflag)
2855     p = qmpos + 1;
2856   *p = '\0';
2857   if (numpad)
2858     {
2859       if (padlen > MAXSTR - 1)
2860         padlen = MAXSTR - 1;
2861       p = pad_expand(winmsg_buf, p, numpad, padlen);
2862     }
2863   if (ev)
2864     {
2865       evdeq(ev);                /* just in case */
2866       ev->timeout.tv_sec = 0;
2867       ev->timeout.tv_usec = 0;
2868     }
2869   if (ev && tick)
2870     {
2871       now.tv_usec = 100000;
2872       if (tick == 1)
2873         now.tv_sec++;
2874       else
2875         now.tv_sec += tick - (now.tv_sec % tick);
2876       ev->timeout = now;
2877       debug2("NEW timeout %d %d\n", ev->timeout.tv_sec, tick);
2878     }
2879   return winmsg_buf;
2880 }
2881
2882 char *
2883 MakeWinMsg(s, win, esc)
2884 char *s;
2885 struct win *win;
2886 int esc;
2887 {
2888   return MakeWinMsgEv(s, win, esc, 0, (struct event *)0, 0);
2889 }
2890
2891 void
2892 PutWinMsg(s, start, max)
2893 char *s;
2894 int start, max;
2895 {
2896   int i, p, l, r, n;
2897   struct mchar rend;
2898   struct mchar rendstack[MAX_WINMSG_REND];
2899   int rendstackn = 0;
2900
2901   if (s != winmsg_buf)
2902     {
2903       /* sorry, no fancy coloring available */
2904       debug1("PutWinMsg %s plain\n", s);
2905       l = strlen(s);
2906       if (l > max)
2907         l = max;
2908       l -= start;
2909       s += start;
2910       while (l-- > 0)
2911         PUTCHARLP(*s++);
2912       return;
2913     }
2914   rend = D_rend;
2915   p = 0;
2916   l = strlen(s);
2917   debug2("PutWinMsg %s start attr %x\n", s, rend.attr);
2918   for (i = 0; i < winmsg_numrend && max > 0; i++)
2919     {
2920       if (p > winmsg_rendpos[i] || winmsg_rendpos[i] > l)
2921         break;
2922       if (p < winmsg_rendpos[i])
2923         {
2924           n = winmsg_rendpos[i] - p;
2925           if (n > max)
2926             n = max;
2927           max -= n;
2928           p += n;
2929           while(n-- > 0)
2930             {
2931               if (start-- > 0)
2932                 s++;
2933               else
2934                 PUTCHARLP(*s++);
2935             }
2936         }
2937       r = winmsg_rend[i];
2938       if (r == -1)
2939         {
2940           if (rendstackn > 0)
2941             rend = rendstack[--rendstackn];
2942         }
2943       else
2944         {
2945           rendstack[rendstackn++] = rend;
2946           ApplyAttrColor(r, &rend);
2947         }
2948       SetRendition(&rend);
2949     }
2950   if (p < l)
2951     {
2952       n = l - p;
2953       if (n > max)
2954         n = max;
2955       while(n-- > 0)
2956         {
2957           if (start-- > 0)
2958             s++;
2959           else
2960             PUTCHARLP(*s++);
2961         }
2962     }
2963 }
2964
2965
2966 #ifdef DEBUG
2967 static void
2968 fds1(i, j)
2969 int i, j;
2970 {
2971   while (i < j)
2972     {
2973       debug1("%d ", i);
2974       i++;
2975     }
2976   if ((j = open("/dev/null", 0)) >= 0)
2977     {
2978       fds1(i + 1, j);
2979       close(j);
2980     }
2981   else
2982     {
2983       while (dup(++i) < 0 && errno != EBADF)
2984         debug1("%d ", i);
2985       debug1(" [%d]\n", i);
2986     }
2987 }
2988
2989 static void
2990 fds()
2991 {
2992   debug("fds: ");
2993   fds1(-1, -1);
2994 }
2995 #endif
2996
2997 static void
2998 serv_read_fn(ev, data)
2999 struct event *ev;
3000 char *data;
3001 {
3002   debug("Knock - knock!\n");
3003   ReceiveMsg();
3004 }
3005
3006 static void
3007 serv_select_fn(ev, data)
3008 struct event *ev;
3009 char *data;
3010 {
3011   struct win *p;
3012
3013   debug("serv_select_fn called\n");
3014   /* XXX: messages?? */
3015   if (GotSigChld)
3016     {
3017       SigChldHandler();
3018     }
3019   if (InterruptPlease)
3020     {
3021       debug("Backend received interrupt\n");
3022       /* This approach is rather questionable in a multi-display
3023        * environment */
3024       if (fore && displays)
3025         {
3026 #if defined(TERMIO) || defined(POSIX)
3027           char ibuf = displays->d_OldMode.tio.c_cc[VINTR];
3028 #else
3029           char ibuf = displays->d_OldMode.m_tchars.t_intrc;
3030 #endif
3031 #ifdef PSEUDOS
3032           write(W_UWP(fore) ? fore->w_pwin->p_ptyfd : fore->w_ptyfd,
3033                 &ibuf, 1);
3034           debug1("Backend wrote interrupt to %d", fore->w_number);
3035           debug1("%s\n", W_UWP(fore) ? " (pseudowin)" : "");
3036 #else
3037           write(fore->w_ptyfd, &ibuf, 1);
3038           debug1("Backend wrote interrupt to %d\n", fore->w_number);
3039 #endif
3040         }
3041       InterruptPlease = 0;
3042     }
3043
3044   for (p = windows; p; p = p->w_next)
3045     {
3046       if (p->w_bell == BELL_FOUND || p->w_bell == BELL_VISUAL)
3047         {
3048           struct canvas *cv;
3049           int visual = p->w_bell == BELL_VISUAL || visual_bell;
3050           p->w_bell = BELL_ON;
3051           for (display = displays; display; display = display->d_next)
3052             {
3053               for (cv = D_cvlist; cv; cv = cv->c_next)
3054                 if (cv->c_layer->l_bottom == &p->w_layer)
3055                   break;
3056               if (cv == 0)
3057                 {
3058                   p->w_bell = BELL_DONE;
3059                   Msg(0, "%s", MakeWinMsg(BellString, p, '%'));
3060                 }
3061               else if (visual && !D_VB && (!D_status || !D_status_bell))
3062                 {
3063                   Msg(0, "%s", VisualBellString);
3064                   if (D_status)
3065                     {
3066                       D_status_bell = 1;
3067                       debug1("using vbell timeout %d\n", VBellWait);
3068                       SetTimeout(&D_statusev, VBellWait );
3069                     }
3070                 }
3071             }
3072           /* don't annoy the user with two messages */
3073           if (p->w_monitor == MON_FOUND)
3074             p->w_monitor = MON_DONE;
3075           WindowChanged(p, 'f');
3076         }
3077       if (p->w_monitor == MON_FOUND)
3078         {
3079           struct canvas *cv;
3080           p->w_monitor = MON_ON;
3081           for (display = displays; display; display = display->d_next)
3082             {
3083               for (cv = D_cvlist; cv; cv = cv->c_next)
3084                 if (cv->c_layer->l_bottom == &p->w_layer)
3085                   break;
3086               if (cv)
3087                 continue;       /* user already sees window */
3088 #ifdef MULTIUSER
3089               if (!(ACLBYTE(p->w_mon_notify, D_user->u_id) & ACLBIT(D_user->u_id)))
3090                 continue;       /* user doesn't care */
3091 #endif
3092               Msg(0, "%s", MakeWinMsg(ActivityString, p, '%'));
3093               p->w_monitor = MON_DONE;
3094             }
3095           WindowChanged(p, 'f');
3096         }
3097     }
3098
3099   for (display = displays; display; display = display->d_next)
3100     {
3101       struct canvas *cv;
3102       if (D_status == STATUS_ON_WIN)
3103         continue;
3104       /* XXX: should use display functions! */
3105       for (cv = D_cvlist; cv; cv = cv->c_next)
3106         {
3107           int lx, ly;
3108
3109           /* normalize window, see resize.c */
3110           lx = cv->c_layer->l_x;
3111           ly = cv->c_layer->l_y;
3112           if (lx == cv->c_layer->l_width)
3113             lx--;
3114           if (ly + cv->c_yoff < cv->c_ys)
3115             {
3116               int i, n = cv->c_ys - (ly + cv->c_yoff);
3117               cv->c_yoff = cv->c_ys - ly;
3118               RethinkViewportOffsets(cv);
3119               if (n > cv->c_layer->l_height)
3120                 n = cv->c_layer->l_height;
3121               CV_CALL(cv,
3122                 LScrollV(flayer, -n, 0, flayer->l_height - 1, 0);
3123                 LayRedisplayLine(-1, -1, -1, 1);
3124                 for (i = 0; i < n; i++)
3125                   LayRedisplayLine(i, 0, flayer->l_width - 1, 1);
3126                 if (cv == cv->c_display->d_forecv)
3127                   LaySetCursor();
3128               );
3129             }
3130           else if (ly + cv->c_yoff > cv->c_ye)
3131             {
3132               int i, n = ly + cv->c_yoff - cv->c_ye;
3133               cv->c_yoff = cv->c_ye - ly;
3134               RethinkViewportOffsets(cv);
3135               if (n > cv->c_layer->l_height)
3136                 n = cv->c_layer->l_height;
3137               CV_CALL(cv,
3138                 LScrollV(flayer, n, 0, cv->c_layer->l_height - 1, 0);
3139                 LayRedisplayLine(-1, -1, -1, 1);
3140                 for (i = 0; i < n; i++)
3141                   LayRedisplayLine(i + flayer->l_height - n, 0, flayer->l_width - 1, 1);
3142                 if (cv == cv->c_display->d_forecv)
3143                   LaySetCursor();
3144               );
3145             }
3146           if (lx + cv->c_xoff < cv->c_xs)
3147             {
3148               int i, n = cv->c_xs - (lx + cv->c_xoff);
3149               if (n < (cv->c_xe - cv->c_xs + 1) / 2)
3150                 n = (cv->c_xe - cv->c_xs + 1) / 2;
3151               if (cv->c_xoff + n > cv->c_xs)
3152                 n = cv->c_xs - cv->c_xoff;
3153               cv->c_xoff += n;
3154               RethinkViewportOffsets(cv);
3155               if (n > cv->c_layer->l_width)
3156                 n = cv->c_layer->l_width;
3157               CV_CALL(cv,
3158                 LayRedisplayLine(-1, -1, -1, 1);
3159                 for (i = 0; i < flayer->l_height; i++)
3160                   {
3161                     LScrollH(flayer, -n, i, 0, flayer->l_width - 1, 0, 0);
3162                     LayRedisplayLine(i, 0, n - 1, 1);
3163                   }
3164                 if (cv == cv->c_display->d_forecv)
3165                   LaySetCursor();
3166               );
3167             }
3168           else if (lx + cv->c_xoff > cv->c_xe)
3169             {
3170               int i, n = lx + cv->c_xoff - cv->c_xe;
3171               if (n < (cv->c_xe - cv->c_xs + 1) / 2)
3172                 n = (cv->c_xe - cv->c_xs + 1) / 2;
3173               if (cv->c_xoff - n + cv->c_layer->l_width - 1 < cv->c_xe)
3174                 n = cv->c_xoff + cv->c_layer->l_width - 1 - cv->c_xe;
3175               cv->c_xoff -= n;
3176               RethinkViewportOffsets(cv);
3177               if (n > cv->c_layer->l_width)
3178                 n = cv->c_layer->l_width;
3179               CV_CALL(cv,
3180                 LayRedisplayLine(-1, -1, -1, 1);
3181                 for (i = 0; i < flayer->l_height; i++)
3182                   {
3183                     LScrollH(flayer, n, i, 0, flayer->l_width - 1, 0, 0);
3184                     LayRedisplayLine(i, flayer->l_width - n, flayer->l_width - 1, 1);
3185                   }
3186                 if (cv == cv->c_display->d_forecv)
3187                   LaySetCursor();
3188               );
3189             }
3190         }
3191     }
3192
3193   for (display = displays; display; display = display->d_next)
3194     {
3195       if (D_status == STATUS_ON_WIN || D_cvlist == 0 || D_cvlist->c_next == 0)
3196         continue;
3197       debug1("serv_select_fn: Restore on cv %#x\n", (int)D_forecv);
3198       CV_CALL(D_forecv, LayRestore();LaySetCursor());
3199     }
3200 }
3201
3202 static void
3203 logflush_fn(ev, data)
3204 struct event *ev;
3205 char *data;
3206 {
3207   struct win *p;
3208   char *buf;
3209   int n;
3210
3211   if (!islogfile(NULL))
3212     return;             /* no more logfiles */
3213   logfflush(NULL);
3214   n = log_flush ? log_flush : (logtstamp_after + 4) / 5;
3215   if (n)
3216     {
3217       SetTimeout(ev, n * 1000);
3218       evenq(ev);        /* re-enqueue ourself */
3219     }
3220   if (!logtstamp_on)
3221     return;
3222   /* write fancy time-stamp */
3223   for (p = windows; p; p = p->w_next)
3224     {
3225       if (!p->w_log)
3226         continue;
3227       p->w_logsilence += n;
3228       if (p->w_logsilence < logtstamp_after)
3229         continue;
3230       if (p->w_logsilence - n >= logtstamp_after)
3231         continue;
3232       buf = MakeWinMsg(logtstamp_string, p, '%');
3233       logfwrite(p->w_log, buf, strlen(buf));
3234     }
3235 }
3236
3237 /*
3238  * Interprets ^?, ^@ and other ^-control-char notation.
3239  * Interprets \ddd octal notation
3240  *
3241  * The result is placed in *cp, p is advanced behind the parsed expression and
3242  * returned.
3243  */
3244 static char *
3245 ParseChar(p, cp)
3246 char *p, *cp;
3247 {
3248   if (*p == 0)
3249     return 0;
3250   if (*p == '^' && p[1])
3251     {
3252       if (*++p == '?')
3253         *cp = '\177';
3254       else if (*p >= '@')
3255         *cp = Ctrl(*p);
3256       else
3257         return 0;
3258       ++p;
3259     }
3260   else if (*p == '\\' && *++p <= '7' && *p >= '0')
3261     {
3262       *cp = 0;
3263       do
3264         *cp = *cp * 8 + *p - '0';
3265       while (*++p <= '7' && *p >= '0');
3266     }
3267   else
3268     *cp = *p++;
3269   return p;
3270 }
3271
3272 static int
3273 ParseEscape(p)
3274 char *p;
3275 {
3276   unsigned char buf[2];
3277
3278   if (*p == 0)
3279     SetEscape((struct acluser *)0, -1, -1);
3280   else
3281     {
3282       if ((p = ParseChar(p, (char *)buf)) == NULL ||
3283           (p = ParseChar(p, (char *)buf+1)) == NULL || *p)
3284         return -1;
3285       SetEscape((struct acluser *)0, buf[0], buf[1]);
3286     }
3287   return 0;
3288 }
3289