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/*

 * Copyright (c) 1980 Regents of the University of California.

 * All rights reserved.  The Berkeley software License Agreement

 * specifies the terms and conditions for redistribution.

 */

#if	!defined(lint) && defined(DOSCCS)

char *copyright =

"@(#) Copyright (c) 1980 Regents of the University of California.\n\

 All rights reserved.\n";

static char *sccsid = "@(#)ex.c	7.5.1.1 (Berkeley) 8/12/86";

#endif /*not lint*/

#include "ex.h"

#include "ex_argv.h"

#include "ex_temp.h"

#include "ex_tty.h"

#ifdef TRACE

char	tttrace[]	= { '/','d','e','v','/','t','t','y','x','x',0 };

#endif

#if defined (__GLIBC__) && (__GLIBC__ >= 2)

#include <malloc.h>

#endif

/*

 * The code for ex is divided as follows:

 *

 * ex.c			Entry point and routines handling interrupt, hangup

 *			signals; initialization code.

 *

 * ex_addr.c		Address parsing routines for command mode decoding.

 *			Routines to set and check address ranges on commands.

 *

 * ex_cmds.c		Command mode command decoding.

 *

 * ex_cmds2.c		Subroutines for command decoding and processing of

 *			file names in the argument list.  Routines to print

 *			messages and reset state when errors occur.

 *

 * ex_cmdsub.c		Subroutines which implement command mode functions

 *			such as append, delete, join.

 *

 * ex_data.c		Initialization of options.

 *

 * ex_get.c		Command mode input routines.

 *

 * ex_io.c		General input/output processing: file i/o, unix

 *			escapes, filtering, source commands, preserving

 *			and recovering.

 *

 * ex_put.c		Terminal driving and optimizing routines for low-level

 *			output (cursor-positioning); output line formatting

 *			routines.

 *

 * ex_re.c		Global commands, substitute, regular expression

 *			compilation and execution.

 *

 * ex_set.c		The set command.

 *

 * ex_subr.c		Loads of miscellaneous subroutines.

 *

 * ex_temp.c		Editor buffer routines for main buffer and also

 *			for named buffers (Q registers if you will.)

 *

 * ex_tty.c		Terminal dependent initializations from termcap

 *			data base, grabbing of tty modes (at beginning

 *			and after escapes).

 *

 * ex_unix.c		Routines for the ! command and its variations.

 *

 * ex_v*.c		Visual/open mode routines... see ex_v.c for a

 *			guide to the overall organization.

 */

/*

 * Main procedure.  Process arguments and then

 * transfer control to the main command processing loop

 * in the routine commands.  We are entered as either "ex", "edit", "vi"

 * or "view" and the distinction is made here.  Actually, we are "vi" if

 * there is a 'v' in our name, "view" is there is a 'w', and "edit" if

 * there is a 'd' in our name.  For edit we just diddle options;

 * for vi we actually force an early visual command.

 */

main(ac, av)

	int ac;

	const char *av[];

{

#ifndef VMUNIX

	char *erpath = EXSTRINGS;

#endif

	register char *cp;

	register int c;

	bool recov = 0;

	bool ivis;

	bool itag = 0;

	bool fast = 0;

	extern int onemt();

#ifdef TRACE

	register char *tracef;

#endif

#if defined (__GLIBC__) && (__GLIBC__ >= 2)

	/*

	 * Disable the use of brk() by malloc,

	 * it has to use mmap() instead.

	 */

	mallopt(M_MMAP_THRESHOLD, 0);

#endif

	/*

	 * Immediately grab the tty modes so that we wont

	 * get messed up if an interrupt comes in quickly.

	 */

	gTTY(1);

#ifndef USG3TTY

	normf = tty.sg_flags;

#else

	normf = tty;

#endif

	ppid = getpid();

	/*

	 * Defend against d's, v's, w's, and a's in directories of

	 * path leading to our true name.

	 */

	av[0] = tailpath(av[0]);

	/*

	 * Figure out how we were invoked: ex, edit, vi, view.

	 */

	ivis = any('v', av[0]);	/* "vi" */

	if (any('w', av[0]))	/* "view" */

		value(READONLY) = 1;

	if (any('d', av[0])) {	/* "edit" */

		value(OPEN) = 0;

		value(REPORT) = 1;

		value(MAGIC) = 0;

	}

#ifndef VMUNIX

	/*

	 * For debugging take files out of . if name is a.out.

	 */

	if (av[0][0] == 'a')

		erpath = tailpath(erpath);

#endif

	/*

	 * Open the error message file.

	 */

	draino();

#ifndef VMUNIX

	erfile = open(erpath+4, 0);

	if (erfile < 0) {

		erfile = open(erpath, 0);

	}

#endif

	pstop();

	/*

	 * Initialize interrupt handling.

	 */

	oldhup = signal(SIGHUP, SIG_IGN);

	if (oldhup == SIG_DFL)

		signal(SIGHUP, onhup);

	oldquit = signal(SIGQUIT, SIG_IGN);

	ruptible = signal(SIGINT, SIG_IGN) == SIG_DFL;

	if (signal(SIGTERM, SIG_IGN) == SIG_DFL)

		signal(SIGTERM, onhup);

#ifdef	SIGEMT

	if (signal(SIGEMT, SIG_IGN) == SIG_DFL)

		signal(SIGEMT, onemt);

#endif

	/*

	 * Process flag arguments.

	 */

	ac--, av++;

	while (ac && av[0][0] == '-') {

		c = av[0][1];

		if (c == 0) {

			hush = 1;

			value(AUTOPRINT) = 0;

			fast++;

		} else switch (c) {

		case 'R':

			value(READONLY) = 1;

			break;

#ifdef TRACE

		case 'T':

			if (av[0][2] == 0)

				tracef = "trace";

			else {

				tracef = tttrace;

				tracef[8] = av[0][2];

				if (tracef[8])

					tracef[9] = av[0][3];

				else

					tracef[9] = 0;

			}

			trace = fopen(tracef, "w");

#define tracbuf NULL

			if (trace == NULL)

				printf("Trace create error\n");

			else

				setbuf(trace, tracbuf);

			break;

#endif

#ifdef LISPCODE

		case 'l':

			value(LISP) = 1;

			value(SHOWMATCH) = 1;

			break;

#endif

		case 'r':

			recov++;

			break;

		case 't':

			if (ac > 1 && av[1][0] != '-') {

				ac--, av++;

				itag = 1;

				/* BUG: should check for too long tag. */

				CP(lasttag, av[0]);

			}

			break;

		case 'v':

			ivis = 1;

			break;

		case 'w':

			defwind = 0;

			if (av[0][2] == 0) defwind = 3;

			else for (cp = &av[0][2]; isdigit(*cp); cp++)

				defwind = 10*defwind + *cp - '0';

			break;

#if 1	/* GR */

		case 'V':

			puts(versionstring);

			exit(0);

#endif

		default:

			smerror("Unknown option %s\n", av[0]);

			break;

		}

		ac--, av++;

	}

	/*

	 * Initialize end of core pointers.

	 * Normally we avoid breaking back to fendcore after each

	 * file since this can be expensive (much core-core copying).

	 * If your system can scatter load processes you could do

	 * this as ed does, saving a little core, but it will probably

	 * not often make much difference.

	 */

	fendcore = (line *) sbrk(0);

	endcore = fendcore - 2;

#ifdef SIGTSTP

	if (!hush && signal(SIGTSTP, SIG_IGN) == SIG_DFL)

		signal(SIGTSTP, onsusp), dosusp++;

#endif

	if (ac && av[0][0] == '+') {

		firstpat = &av[0][1];

		ac--, av++;

	}

	/*

	 * If we are doing a recover and no filename

	 * was given, then execute an exrecover command with

	 * the -r option to type out the list of saved file names.

	 * Otherwise set the remembered file name to the first argument

	 * file name so the "recover" initial command will find it.

	 */

	if (recov) {

		if (ac == 0) {

			ppid = 0;

			setrupt();

			execl(EXRECOVER, "exrecover", "-r", 0);

			filioerr(EXRECOVER);

			exit(1);

		}

		CP(savedfile, *av++), ac--;

	}

	/*

	 * Initialize the argument list.

	 */

	argv0 = av;

	argc0 = ac;

	args0 = av[0];

	erewind();

	/*

	 * Initialize a temporary file (buffer) and

	 * set up terminal environment.  Read user startup commands.

	 */

	if (setexit() == 0) {

		setrupt();

		intty = isatty(0);

		value(PROMPT) = intty;

		if (cp = getenv("SHELL"))

			CP(shell, cp);

		if (fast || !intty)

			setterm("dumb");

		else {

			gettmode();

			if ((cp = getenv("TERM")) != 0 && *cp) {

				setterm(cp);

			}

		}

	}

	if (setexit() == 0 && !fast && intty) {

		if ((globp = getenv("EXINIT")) && *globp)

			commands(1,1);

		else {

			globp = 0;

			if ((cp = getenv("HOME")) != 0 && *cp) {

				(void) strcat(strcpy(genbuf, cp), "/.exrc");

				if (iownit(genbuf))

					source(genbuf, 1);

			}

		}

		/*

		 * Allow local .exrc too.  This loses if . is $HOME,

		 * but nobody should notice unless they do stupid things

		 * like putting a version command in .exrc.  Besides,

		 * they should be using EXINIT, not .exrc, right?

		 */

		 if (iownit(".exrc"))

			source(".exrc", 1);

	}

	init();	/* moved after prev 2 chunks to fix directory option */

	/*

	 * Initial processing.  Handle tag, recover, and file argument

	 * implied next commands.  If going in as 'vi', then don't do

	 * anything, just set initev so we will do it later (from within

	 * visual).

	 */

	if (setexit() == 0) {

		if (recov)

			globp = "recover";

		else if (itag)

			globp = ivis ? "tag" : "tag|p";

		else if (argc)

			globp = "next";

		if (ivis)

			initev = globp;

		else if (globp) {

			inglobal = 1;

			commands(1, 1);

			inglobal = 0;

		}

	}

	/*

	 * Vi command... go into visual.

	 * Strange... everything in vi usually happens

	 * before we ever "start".

	 */

	if (ivis) {

		/*

		 * Don't have to be upward compatible with stupidity

		 * of starting editing at line $.

		 */

		if (dol > zero)

			dot = one;

		globp = "visual";

		if (setexit() == 0)

			commands(1, 1);

	}

	/*

	 * Clear out trash in state accumulated by startup,

	 * and then do the main command loop for a normal edit.

	 * If you quit out of a 'vi' command by doing Q or ^\,

	 * you also fall through to here.

	 */

	seenprompt = 1;

	ungetchar(0);

	globp = 0;

	initev = 0;

	setlastchar('\n');

	setexit();

	commands(0, 0);

	cleanup(1);

	exit(0);

}

/*

 * Initialization, before editing a new file.

 * Main thing here is to get a new buffer (in fileinit),

 * rest is peripheral state resetting.

 */

init()

{

	register int i;

	fileinit();

	dot = zero = truedol = unddol = dol = fendcore;

	one = zero+1;

	undkind = UNDNONE;

	chng = 0;

	edited = 0;

	for (i = 0; i <= 'z'-'a'+1; i++)

		names[i] = 1;

	anymarks = 0;

}

/*

 * Return last component of unix path name p.

 */

char *

tailpath(p)

register char *p;

{

	register char *r;

	for (r=p; *p; p++)

		if (*p == '/')

			r = p+1;

	return(r);

}

/*

 * Check ownership of file.  Return nonzero if it exists and is owned by the

 * user or the option sourceany is used

 */

iownit(file)

char *file;

{

	struct stat sb;

	if (stat(file, &sb) == 0 && (value(SOURCEANY) || sb.st_uid == getuid()))

		return(1);

	else

		return(0);

}