/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/* Copyright (c) 1981 Regents of the University of California */

#include "ex.h"
#include "ex_argv.h"
#include "ex_temp.h"
#include "ex_tty.h"
#include <stdlib.h>
#include <locale.h>
#include <stdio.h>
#ifdef TRACE
unsigned char	tttrace[BUFSIZ];
#endif

#define	EQ(a, b)	(strcmp(a, b) == 0)

char	*strrchr();
void	init_re(void);

/*
 * 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.
 */

/*
 * This sets the Version of ex/vi for both the exstrings file and
 * the version command (":ver").
 */

/* variable used by ":ver" command */
unsigned char *Version = (unsigned char *)"Version SVR4.0, Solaris 2.5.0";

/*
 * NOTE: when changing the Version number, it must be changed in the
 *	 following files:
 *
 *			  port/READ_ME
 *			  port/ex.c
 *			  port/ex.news
 *
 */
#ifdef XPG4
unsigned char *savepat = (unsigned char *) NULL; /* firstpat storage	*/
#endif /* XPG4 */

/*
 * 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. For edit we just diddle options;
 * for vi we actually force an early visual command.
 */
static unsigned char cryptkey[19]; /* contents of encryption key */

static void usage(unsigned char *);

static int validate_exrc(unsigned char *);

void init(void);

int
main(int ac, char *av[])
{
	extern 	char 	*optarg;
	extern 	int	optind;
	unsigned char	*rcvname = 0;
	unsigned char *cp;
	int c;
	unsigned char	*cmdnam;
	bool recov = 0;
	bool ivis = 0;
	bool itag = 0;
	bool fast = 0;
	extern int verbose;
	int argcounter = 0;
	extern int tags_flag;	/* Set if tag file is not sorted (-S flag) */
	unsigned char scratch [PATH_MAX+1];   /* temp for sourcing rc file(s) */
	int vret = 0;
	unsigned char exrcpath [PATH_MAX+1]; /* temp for sourcing rc file(s) */
	int toptseen = 0;
#ifdef TRACE
	unsigned char *tracef;
#endif
	tagflg = 0;
	(void) setlocale(LC_ALL, "");
#if !defined(TEXT_DOMAIN)
#define	TEXT_DOMAIN "SYS_TEST"
#endif
	(void) textdomain(TEXT_DOMAIN);

	/*
	 * Immediately grab the tty modes so that we won't
	 * get messed up if an interrupt comes in quickly.
	 */
	(void) gTTY(2);
	normf = tty;
	ppid = getpid();
	/* Note - this will core dump if you didn't -DSINGLE in CFLAGS */
	lines = 24;
	columns = 80;	/* until defined right by setupterm */
	/*
	 * Defend against d's, v's, w's, and a's in directories of
	 * path leading to our true name.
	 */
	if ((cmdnam = (unsigned char *)strrchr(av[0], '/')) != 0)
		cmdnam++;
	else
		cmdnam = (unsigned char *)av[0];

	if (EQ((char *)cmdnam, "vi"))
		ivis = 1;
	else if (EQ(cmdnam, "view")) {
		ivis = 1;
		value(vi_READONLY) = 1;
	} else if (EQ(cmdnam, "vedit")) {
		ivis = 1;
		value(vi_NOVICE) = 1;
		value(vi_REPORT) = 1;
		value(vi_MAGIC) = 0;
		value(vi_SHOWMODE) = 1;
	} else if (EQ(cmdnam, "edit")) {
		value(vi_NOVICE) = 1;
		value(vi_REPORT) = 1;
		value(vi_MAGIC) = 0;
		value(vi_SHOWMODE) = 1;
	}

#ifdef	XPG4
	{
		struct winsize jwin;
		char *envptr;

		envlines = envcolumns = -1;
		oldlines = oldcolumns = -1;

		if (ioctl(0, TIOCGWINSZ, &jwin) != -1) {
			oldlines = jwin.ws_row;
			oldcolumns = jwin.ws_col;
		}

		if ((envptr = getenv("LINES")) != NULL &&
		    *envptr != '\0' && isdigit(*envptr)) {
			if ((envlines = atoi(envptr)) <= 0) {
				envlines = -1;
			}
		}

		if ((envptr = getenv("COLUMNS")) != NULL &&
		    *envptr != '\0' && isdigit(*envptr)) {
			if ((envcolumns = atoi(envptr)) <= 0) {
				envcolumns = -1;
			}
		}
	}
#endif /* XPG4 */

	draino();
	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);
	signal(SIGILL, oncore);
	signal(SIGTRAP, oncore);
	signal(SIGIOT, oncore);
	signal(SIGFPE, oncore);
	signal(SIGBUS, oncore);
	signal(SIGSEGV, oncore);
	signal(SIGPIPE, oncore);
	init_re();
	while (1) {
#ifdef TRACE
		while ((c = getopt(ac, (char **)av, "VU:Lc:Tvt:rlw:xRCsS")) !=
		    EOF)
#else
		while ((c = getopt(ac, (char **)av,
		    "VLc:vt:rlw:xRCsS")) != EOF)
#endif
			switch (c) {
			case 's':
				hush = 1;
				value(vi_AUTOPRINT) = 0;
				fast++;
				break;

			case 'R':
				value(vi_READONLY) = 1;
				break;
			case 'S':
				tags_flag = 1;
				break;
#ifdef TRACE
			case 'T':
				tracef = (unsigned char *)"trace";
				goto trace;

			case 'U':
				tracef = tttrace;
				strcpy(tracef, optarg);
		trace:
				trace = fopen((char *)tracef, "w");
#define	tracbuf	NULL
				if (trace == NULL)
					viprintf("Trace create error\n");
				else
					setbuf(trace, (char *)tracbuf);
				break;
#endif
			case 'c':
				if (optarg != NULL)
					firstpat = (unsigned char *)optarg;
				else
					firstpat = (unsigned char *)"";
				break;

			case 'l':
				value(vi_LISP) = 1;
				value(vi_SHOWMATCH) = 1;
				break;

			case 'r':
				if (av[optind] && (c = av[optind][0]) &&
				    c != '-') {
					if ((strlen(av[optind])) >=
					    sizeof (savedfile)) {
						(void) fprintf(stderr, gettext(
						    "Recovered file name"
						    " too long\n"));
						exit(1);
					}

					rcvname = (unsigned char *)av[optind];
					optind++;
				}
				/* FALLTHROUGH */

			case 'L':
				recov++;
				break;

			case 'V':
				verbose = 1;
				break;

			case 't':
				if (toptseen) {
					usage(cmdnam);
					exit(1);
				} else {
					toptseen++;
				}
				itag = tagflg = 1; /* -t option */
				if (strlcpy(lasttag, optarg,
				    sizeof (lasttag)) >= sizeof (lasttag)) {
					(void) fprintf(stderr, gettext("Tag"
					    " file name too long\n"));
					exit(1);
				}
				break;

			case 'w':
				defwind = 0;
				if (optarg[0] == NULL)
					defwind = 3;
				else for (cp = (unsigned char *)optarg;
				    isdigit(*cp); cp++)
					defwind = 10*defwind + *cp - '0';
				if (defwind < 0)
					defwind = 3;
				break;

			case 'C':
				crflag = 1;
				xflag = 1;
				break;

			case 'x':
				/* encrypted mode */
				xflag = 1;
				crflag = -1;
				break;

			case 'v':
				ivis = 1;
				break;

			default:
				usage(cmdnam);
				exit(1);
			}
		if (av[optind] && av[optind][0] == '+' &&
		    av[optind-1] && strcmp(av[optind-1], "--")) {
				firstpat = (unsigned char *)&av[optind][1];
				optind++;
				continue;
		} else if (av[optind] && av[optind][0] == '-' &&
		    av[optind-1] && strcmp(av[optind-1], "--")) {
			hush = 1;
			value(vi_AUTOPRINT) = 0;
			fast++;
			optind++;
			continue;
		}
		break;
	}

	if (isatty(0) == 0) {
		/*
		 * If -V option is set and input is coming in via
		 * stdin then vi behavior should be ignored. The vi
		 * command should act like ex and only process ex commands
		 * and echo the input ex commands to stderr
		 */
		if (verbose == 1) {
			ivis = 0;
		}

		/*
		 * If the standard input is not a terminal device,
		 * it is as if the -s option has been specified.
		 */
		if (ivis == 0) {
			hush = 1;
			value(vi_AUTOPRINT) = 0;
			fast++;
		}
	}

	ac -= optind;
	av  = &av[optind];

	for (argcounter = 0; argcounter < ac; argcounter++) {
		if ((strlen(av[argcounter])) >= sizeof (savedfile)) {
			(void) fprintf(stderr, gettext("File argument"
			    " too long\n"));
			exit(1);
		}
	}

#ifdef SIGTSTP
	if (!hush && signal(SIGTSTP, SIG_IGN) == SIG_DFL)
		signal(SIGTSTP, onsusp), dosusp++;
#endif

	if (xflag) {
		permflag = 1;
		if ((kflag = run_setkey(perm,
		    (key = (unsigned char *)getpass(
		    gettext("Enter key:"))))) == -1) {
			kflag = 0;
			xflag = 0;
			smerror(gettext("Encryption facility not available\n"));
		}
		if (kflag == 0)
			crflag = 0;
		else {
			strcpy(cryptkey, "CrYpTkEy=XXXXXXXXX");
			strcpy(cryptkey + 9, key);
			if (putenv((char *)cryptkey) != 0)
			smerror(gettext(" Cannot copy key to environment"));
		}

	}
#ifndef PRESUNEUC
	/*
	 * Perform locale-specific initialization
	 */
	localize();
#endif /* PRESUNEUC */

	/*
	 * 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;

	/*
	 * 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 && (rcvname == NULL || *rcvname == NULL)) {
			ppid = 0;
			setrupt();
			execlp(EXRECOVER, "exrecover", "-r", (char *)0);
			filioerr(EXRECOVER);
			exit(++errcnt);
		}
		if (rcvname && *rcvname)
			(void) strlcpy(savedfile, rcvname, sizeof (savedfile));
		else {
			(void) strlcpy(savedfile, *av++, sizeof (savedfile));
			ac--;
		}
	}

	/*
	 * Initialize the argument list.
	 */
	argv0 = (unsigned char **)av;
	argc0 = ac;
	args0 = (unsigned char *)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(vi_PROMPT) = intty;
		if (((cp = (unsigned char *)getenv("SHELL")) != NULL) &&
		    (*cp != '\0')) {
			if (strlen(cp) < sizeof (shell)) {
				(void) strlcpy(shell, cp, sizeof (shell));
			}
		}
		if (fast)
			setterm((unsigned char *)"dumb");
		else {
			gettmode();
			cp = (unsigned char *)getenv("TERM");
			if (cp == NULL || *cp == '\0')
				cp = (unsigned char *)"unknown";
			setterm(cp);
		}
	}

	/*
	 * Bring up some code from init()
	 * This is still done in init later. This
	 * avoids null pointer problems
	 */

	dot = zero = truedol = unddol = dol = fendcore;
	one = zero+1;
	{
	int i;

	for (i = 0; i <= 'z'-'a'+1; i++)
		names[i] = 1;
	}

	if (setexit() == 0 && !fast) {
		if ((globp =
		    (unsigned char *) getenv("EXINIT")) && *globp) {
			if (ivis)
				inexrc = 1;
			commands(1, 1);
			inexrc = 0;
		} else {
			globp = 0;
			if ((cp = (unsigned char *) getenv("HOME")) !=
			    0 && *cp) {
				strncpy(scratch, cp, sizeof (scratch) - 1);
				strncat(scratch, "/.exrc",
				    sizeof (scratch) - 1 - strlen(scratch));
				if (ivis)
					inexrc = 1;
				if ((vret = validate_exrc(scratch)) == 0) {
					source(scratch, 1);
				} else {
					if (vret == -1) {
						error(gettext(
						    "Not owner of .exrc "
						    "or .exrc is group or "
						    "world writable"));
					}
				}
				inexrc = 0;
			}
		}

		/*
		 * Allow local .exrc if the "exrc" option was set. 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 (value(vi_EXRC)) {
			if (ivis)
				inexrc = 1;
			if ((cp = (unsigned char *) getenv("PWD")) != 0 &&
			    *cp) {
				strncpy(exrcpath, cp, sizeof (exrcpath) - 1);
				strncat(exrcpath, "/.exrc",
				    sizeof (exrcpath) - 1 - strlen(exrcpath));
				if (strcmp(scratch, exrcpath) != 0) {
					if ((vret =
					    validate_exrc(exrcpath)) == 0) {
						source(exrcpath, 1);
					} else {
						if (vret == -1) {
							error(gettext(
							    "Not owner of "
							    ".exrc or .exrc "
							    "is group or world "
							    "writable"));
						}
					}
				}
			}
			inexrc = 0;
		}
	}

	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 = (unsigned char *)"recover";
		else if (itag) {
			globp = ivis ? (unsigned char *)"tag" :
			    (unsigned char *)"tag|p";
#ifdef	XPG4
			if (firstpat != NULL) {
				/*
				 * if the user specified the -t and -c
				 * flags together, then we service these
				 * commands here. -t is handled first.
				 */
				savepat = firstpat;
				firstpat = NULL;
				inglobal = 1;
				commands(1, 1);

				/* now handle the -c argument: */
				globp = savepat;
				commands(1, 1);
				inglobal = 0;
				globp = savepat = NULL;

				/* the above isn't sufficient for ex mode: */
				if (!ivis) {
					setdot();
					nonzero();
					plines(addr1, addr2, 1);
				}
			}
#endif /* XPG4 */
		} else if (argc)
			globp = (unsigned char *)"next";
		if (ivis)
			initev = globp;
		else if (globp) {
			inglobal = 1;
			commands(1, 1);
			inglobal = 0;
		}
	}

	/*
	 * Vi command... go into visual.
	 */
	if (ivis) {
		/*
		 * Don't have to be upward compatible
		 * by starting editing at line $.
		 */
#ifdef	XPG4
		if (!itag && (dol > zero))
#else /* XPG4 */
		if (dol > zero)
#endif /* XPG4 */
			dot = one;
		globp = (unsigned char *)"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);
	return (errcnt);
}

/*
 * Initialization, before editing a new file.
 * Main thing here is to get a new buffer (in fileinit),
 * rest is peripheral state resetting.
 */
void
init(void)
{
	int i;
	void (*pstat)();
	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;
	if (xflag) {
		xtflag = 1;
		/* ignore SIGINT before crypt process */
		pstat = signal(SIGINT, SIG_IGN);
		if (tpermflag)
			(void) crypt_close(tperm);
		tpermflag = 1;
		if (makekey(tperm) != 0) {
			xtflag = 0;
			smerror(gettext(
			    "Warning--Cannot encrypt temporary buffer\n"));
		}
		signal(SIGINT, pstat);
	}
}

/*
 * Return last component of unix path name p.
 */
unsigned char *
tailpath(p)
unsigned char *p;
{
	unsigned char *r;

	for (r = p; *p; p++)
		if (*p == '/')
			r = p+1;
	return (r);
}


/*
 * validate_exrc - verify .exrc as belonging to the user.
 * The file uid should match the process ruid,
 * and the file should be writable only by the owner.
 */
static int
validate_exrc(unsigned char *exrc_path)
{
	struct stat64 exrc_stat;
	int process_uid;

	if (stat64((char *)exrc_path, &exrc_stat) == -1)
		return (0); /* ignore if .exrec is not found */
	process_uid = geteuid();
	/* if not root, uid must match file owner */
	if (process_uid && process_uid != exrc_stat.st_uid)
		return (-1);
	if ((exrc_stat.st_mode & (S_IWGRP | S_IWOTH)) != 0)
		return (-1);
	return (0);
}

/*
 * print usage message to stdout
 */
static void
usage(unsigned char *name)
{
	char buf[160];

#ifdef TRACE
	(void) snprintf(buf, sizeof (buf), gettext(
	    "Usage: %s [- | -s] [-l] [-L] [-wn] "
	    "[-R] [-S] [-r [file]] [-t tag] [-T] [-U tracefile]\n"
	    "[-v] [-V] [-x] [-C] [+cmd | -c cmd] file...\n"), name);
#else
	(void) snprintf(buf, sizeof (buf), gettext(
	    "Usage: %s [- | -s] [-l] [-L] [-wn] "
	    "[-R] [-S] [-r [file]] [-t tag]\n"
	    "[-v] [-V] [-x] [-C] [+cmd | -c cmd] file...\n"), name);
#endif
	(void) write(2, buf, strlen(buf));
}