/* Fully extensible Emacs, running on Unix, intended for GNU.
   Copyright (C) 1985 Richard M. Stallman.

This file is part of GNU Emacs.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY.  No author or distributor
accepts responsibility to anyone for the consequences of using it
or for whether it serves any particular purpose or works at all,
unless he says so in writing.  Refer to the GNU Emacs General Public
License for full details.

Everyone is granted permission to copy, modify and redistribute
GNU Emacs, but only under the conditions described in the
GNU Emacs General Public License.   A copy of this license is
supposed to have been given to you along with GNU Emacs so you
can know your rights and responsibilities.  It should be in a
file named COPYING.  Among other things, the copyright notice
and this notice must be preserved on all copies.  */


#include <signal.h>

#include "config.h"
#include <stdio.h>
#undef NULL
#include "lisp.h"
#include "commands.h"

#include <sys/types.h>
#include <sys/file.h>

#ifdef USG5
#include <fcntl.h>
#endif

#ifdef BSD
#include <sys/ioctl.h>
#endif

#ifndef O_RDWR
#define O_RDWR 2
#endif

#define PRIO_PROCESS 0

/* Command line args from shell, as list of strings */
Lisp_Object Vcommand_line_args;

/* Set nonzero after Emacs has started up the first time.
  Prevents reinitialization of the Lisp world and keymaps
  on subsequent starts.  */
int initialized;

/* Variable whose value is symbol giving operating system type */
Lisp_Object Vsystem_type;

/* Nonzero means running Emacs without interactive terminal.  */

int noninteractive;

/* Value of Lisp variable `noninteractive'.
   Normally same as C variable `noninteractive'
   but nothing terrible happens if user sets this one.  */

int noninteractive1;

/* Signal code for the fatal signal that was received */
int fatal_error_code;

/* Nonzero if handling a fatal error already */
int fatal_error_in_progress;

/* Handle bus errors, illegal instruction, etc. */
fatal_error_signal (sig)
     int sig;
{
#ifdef BSD
  int tpgrp;
#endif /* BSD */

  fatal_error_code = sig;
  signal (sig, SIG_DFL);

  /* If fatal error occurs in code below, avoid infinite recursion.  */
  if (fatal_error_in_progress)
    kill (getpid (), fatal_error_code);

  fatal_error_in_progress = 1;

  /* If we are controlling the terminal, reset terminal modes */
#ifdef BSD
  if (ioctl(0, TIOCGPGRP, &tpgrp) == 0
      && tpgrp == getpgrp (0))
#endif /* BSD */
    {
      reset_sys_modes ();
      if (sig != SIGTERM)
	fprintf (stderr, "Fatal error.");
    }

  /* Clean up */
#ifdef subprocesses
  kill_buffer_processes (Qnil);
#endif
  Fdo_auto_save (Qt);

#ifdef CLASH_DETECTION
  unlock_all_files ();
#endif /* CLASH_DETECTION */

  /* Signal the same code; this time it will really be fatal.  */
  kill (getpid (), fatal_error_code);
}

/* Code for dealing with Lisp access to the Unix command line */

static
init_cmdargs (argc, argv, skip_args)
     int argc;
     char **argv;
     int skip_args;
{
  register int i;

  Vcommand_line_args = Qnil;

  for (i = argc - 1; i >= 0; i--)
    {
      if (i == 0 || i > skip_args)
	Vcommand_line_args
	  = Fcons (build_string (argv[i]), Vcommand_line_args);
    }
}

/* ARGSUSED */
main (argc, argv, envp)
     int argc;
     char **argv;
     char **envp;
{
  int skip_args = 0;
  extern int errno;
  clearerr (stdin);

#ifdef APOLLO			/* Reserve memory space for sbrk to get */
  set_sbrk_size (4000000);
#endif /* APOLLO */

  signal (SIGHUP, fatal_error_signal);
  signal (SIGQUIT, fatal_error_signal);
  signal (SIGILL, fatal_error_signal);
  signal (SIGTRAP, fatal_error_signal);
  signal (SIGIOT, fatal_error_signal);
  signal (SIGEMT, fatal_error_signal);
  signal (SIGFPE, fatal_error_signal);
  signal (SIGBUS, fatal_error_signal);
  signal (SIGSEGV, fatal_error_signal);
  signal (SIGSYS, fatal_error_signal);
  signal (SIGTERM, fatal_error_signal);
#ifdef SIGXCPU
  signal (SIGXCPU, fatal_error_signal);
#endif
#ifdef SIGXFSZ
  signal (SIGXFSZ, fatal_error_signal);
#endif SIGXFSZ

#ifdef HIGHPRI
  setpriority(PRIO_PROCESS, getpid(), HIGHPRI);
  setuid(getuid());
#endif HIGHPRI

/* Handle the -t switch, which specifies filename to use as terminal */
  if (2 < argc && !strcmp (argv[1], "-t"))
    {
      skip_args = 2;
      close (0);
      close (1);
      open(argv[2], O_RDWR, 2 );
      dup (0);
      fprintf (stderr, "Using %s\n", argv[2]);
    }

/* Handle the -batch switch, which means don't do interactive display.  */
  noninteractive = 0;
  if (1 < argc && !strcmp (argv[1], "-batch"))
    {
      skip_args = 1;
      noninteractive = 1;
    }

  noninteractive1 = noninteractive;

/* Perform basic initializations (not merely interning symbols) */

  if (!initialized)
    {
      init_alloc_once ();
      init_obarray ();
      init_eval_once ();
      init_syntax_once ();	/* Create standard syntax table.  */
		      /* Must be done before init_buffer */
      init_buffer_once ();	/* Create buffer table and some buffers */
      init_minibuf_once ();	/* Create list of minibuffers */
			      /* Must precede init_window_once */
      init_window_once ();	/* Init the window system */
    }

  init_alloc ();
  init_eval ();
  init_data ();
  init_read ();

  init_cmdargs (argc, argv, skip_args);	/* Create list Vcommand_line_args */
  init_buffer ();	/* Init default directory of main buffer */
  if (!noninteractive)
    init_display ();	/* Determine terminal type.  init_sys_modes uses results */
  init_keyboard ();	/* This too must precede init_sys_modes */
  init_sys_modes ();	/* Init system terminal modes (RAW or CBREAK, etc.) */
  init_xdisp ();
  init_macros ();
  init_editfns ();
  init_callproc ();
#ifdef subprocesses
  init_process ();
#endif subprocesses

/* Intern the names of all standard functions and variables; define standard keys */

  if (!initialized)
    {
      /* The basic levels of Lisp must come first */
      /* And data must come first of all
	 for the sake of symbols like error-message */
      syms_of_data ();
      syms_of_alloc ();
      syms_of_read ();
      syms_of_print ();
      syms_of_eval ();
      syms_of_fns ();

      syms_of_abbrev ();
      syms_of_buffer ();
      syms_of_bytecode ();
      syms_of_callint ();
      syms_of_casefiddle ();
      syms_of_callproc ();
      syms_of_cmds ();
#ifndef NO_DIR_LIBRARY
      syms_of_dired ();
#endif /* not NO_DIR_LIBRARY */
      syms_of_display ();
      syms_of_doc ();
      syms_of_editfns ();
      syms_of_emacs ();
      syms_of_fileio ();
#ifdef CLASH_DETECTION
      syms_of_filelock ();
#endif /* CLASH_DETECTION */
      syms_of_indent ();
      syms_of_keyboard ();
      syms_of_keymap ();
      syms_of_macros ();
      syms_of_marker ();
      syms_of_minibuf ();
      syms_of_mocklisp ();
#ifdef subprocesses
      syms_of_process ();
#endif /* subprocesses */
      syms_of_search ();
      syms_of_syntax ();
      syms_of_undo ();
      syms_of_window ();
      syms_of_xdisp ();
#ifdef HAVE_X_WINDOWS
      syms_of_xfns ();
#endif /* HAVE_X_WINDOWS */

      keys_of_casefiddle ();
      keys_of_cmds ();
      keys_of_buffer ();
      keys_of_keyboard ();
      keys_of_keymap ();
      keys_of_macros ();
      keys_of_minibuf ();
      keys_of_window ();
    }

  if (!initialized)
    {
      /* Handle -l loadup-and-dump, args passed by Makefile. */
      if (argc > 2 + skip_args && !strcmp (argv[1 + skip_args], "-l"))
	Vtop_level = Fcons (intern ("load"),
			    Fcons (build_string (argv[2 + skip_args]), Qnil));
#ifdef CANNOT_DUMP
      /* Unless next switch is -nl, load "loadup.el" first thing.  */
      if (!(argc > 1 + skip_args && !strcmp (argv[1 + skip_args], "-nl")))
	Vtop_level = Fcons (intern ("load"),
			    Fcons (build_string ("loadup.el"), Qnil));
#endif /* CANNOT_DUMP */
    }

  initialized = 1;

  /* Enter editor command loop.  This never returns.  */
  Frecursive_edit ();
  /* NOTREACHED */
}

DEFUN ("kill-emacs", Fkill_emacs, Skill_emacs, 0, 1, "P",
  "Exit the Emacs job and kill it.  ARG means no query.\n\
If emacs is running noninteractively and ARG is an integer,\n\
return ARG as the exit program code.")
  (arg)
     Lisp_Object arg;
{
  Lisp_Object answer;
  int i;

  if (feof (stdin))
    arg = Qt;
  if (!noninteractive && NULL (arg))
    {
      if ((i = ModExist())
	  && (answer = Fyes_or_no_p (format1 (
"%d modified buffer%s exist%s, do you really want to exit? ",
					      i, i == 1 ? "" : "s",
					      i == 1 ? "s" : "")),
	      NULL (answer)))
	return Qnil;

#ifdef subprocesses
      if (count_active_processes()
	  && (answer = Fyes_or_no_p (format1 (
"Subprocesses are executing; kill them and exit? ")),
	      NULL (answer)))
	return Qnil;
#endif /* subprocesses */
    }

#ifdef subprocesses
  kill_buffer_processes (Qnil);
#endif /* subprocesses */

  Fdo_auto_save (Qt);

#ifdef CLASH_DETECTION
  unlock_all_files ();
#endif /* CLASH_DETECTION */

  fflush (stdout);
  reset_sys_modes ();
  stuff_buffered_input (arg);
  exit ((XTYPE (arg) == Lisp_Int) ? XINT (arg) : 0);
  /* NOTREACHED */
}

#ifndef CANNOT_DUMP
/* Nothing like this can be implemented on an Apollo.
   What a loss!  */

DEFUN ("dump-emacs", Fdump_emacs, Sdump_emacs, 2, 2, 0,
  "Dump current state of Emacs into executable file FILENAME.\n\
Take symbols from SYMFILE (presumably the file you executed to run Emacs).")
  (intoname, symname)
     Lisp_Object intoname, symname;
{
  register unsigned char *a_name = 0;
  extern int my_edata;
  Lisp_Object tem;
  extern _start ();

  CHECK_STRING (intoname, 0);
  intoname = Fexpand_file_name (intoname, Qnil);
  if (!NULL (symname))
    {
      CHECK_STRING (symname, 0);
      if (XSTRING (symname)->size)
	{
	  symname = Fexpand_file_name (symname, Qnil);
	  a_name = XSTRING (symname)->data;
	}
    }

  tem = Vpurify_flag;
  Vpurify_flag = Qnil;

  fflush (stdout);
  malloc_init (&my_edata);	/* Tell malloc where start of impure now is */
  unexec (XSTRING (intoname)->data, a_name, &my_edata, 0, _start);

  Vpurify_flag = tem;

  return Qnil;
}

#endif /* not CANNOT_DUMP */

Lisp_Object
decode_env_path (evarname, defalt)
     char *evarname, *defalt;
{
  register char *path, *p;
  extern char *index ();

  Lisp_Object lpath;

  path = (char *) getenv (evarname);
  if (!path)
    path = defalt;
  lpath = Qnil;
  while (1)
    {
      p = index (path, ':');
      if (!p) p = path + strlen (path);
      lpath = Fcons (p - path ? make_string (path, p - path) : Qnil,
		     lpath);
      if (*p)
	path = p + 1;
      else
	break;
    }
  return Fnreverse (lpath);
}

syms_of_emacs ()
{
#ifndef CANNOT_DUMP
  defsubr (&Sdump_emacs);
#endif /* not CANNOT_DUMP */

  defsubr (&Skill_emacs);

  DefLispVar ("command-line-args", &Vcommand_line_args,
    "Args passed by shell to Emacs, as a list of strings.");

  DefLispVar ("system-type", &Vsystem_type,
    "Symbol indicating type of operating system you are using.");
  Vsystem_type = intern (SYSTEM_TYPE);

  DefBoolVar ("noninteractive", &noninteractive1,
    "Non-nil means Emacs is running without interactive terminal.");
}