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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: ex_edit.c,v 1.5 2009/10/27 23:59:47 deraadt Exp $	*/

/*-
 * Copyright (c) 1992, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1992, 1993, 1994, 1995, 1996
 *	Keith Bostic.  All rights reserved.
 *
 * See the LICENSE file for redistribution information.
 */

#include "config.h"

#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>

#include <bitstring.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../common/common.h"
#include "../vi/vi.h"

static int ex_N_edit(SCR *, EXCMD *, FREF *, int);

/*
 * ex_edit --	:e[dit][!] [+cmd] [file]
 *		:ex[!] [+cmd] [file]
 *		:vi[sual][!] [+cmd] [file]
 *
 * Edit a file; if none specified, re-edit the current file.  The third
 * form of the command can only be executed while in vi mode.  See the
 * hack in ex.c:ex_cmd().
 *
 * !!!
 * Historic vi didn't permit the '+' command form without specifying
 * a file name as well.  This seems unreasonable, so we support it
 * regardless.
 *
 * PUBLIC: int ex_edit(SCR *, EXCMD *);
 */
int
ex_edit(sp, cmdp)
	SCR *sp;
	EXCMD *cmdp;
{
	FREF *frp;
	int attach, setalt;

	switch (cmdp->argc) {
	case 0:
		/*
		 * If the name has been changed, we edit that file, not the
		 * original name.  If the user was editing a temporary file
		 * (or wasn't editing any file), create another one.  The
		 * reason for not reusing temporary files is that there is
		 * special exit processing of them, and reuse is tricky.
		 */
		frp = sp->frp;
		if (sp->ep == NULL || F_ISSET(frp, FR_TMPFILE)) {
			if ((frp = file_add(sp, NULL)) == NULL)
				return (1);
			attach = 0;
		} else
			attach = 1;
		setalt = 0;
		break;
	case 1:
		if ((frp = file_add(sp, cmdp->argv[0]->bp)) == NULL)
			return (1);
		attach = 0;
		setalt = 1;
		set_alt_name(sp, cmdp->argv[0]->bp);
		break;
	default:
		abort();
	}

	if (F_ISSET(cmdp, E_NEWSCREEN))
		return (ex_N_edit(sp, cmdp, frp, attach));

	/*
	 * Check for modifications.
	 *
	 * !!!
	 * Contrary to POSIX 1003.2-1992, autowrite did not affect :edit.
	 */
	if (file_m2(sp, FL_ISSET(cmdp->iflags, E_C_FORCE)))
		return (1);

	/* Switch files. */
	if (file_init(sp, frp, NULL, (setalt ? FS_SETALT : 0) |
	    (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0)))
		return (1);

	F_SET(sp, SC_FSWITCH);
	return (0);
}

/*
 * ex_N_edit --
 *	New screen version of ex_edit.
 */
static int
ex_N_edit(sp, cmdp, frp, attach)
	SCR *sp;
	EXCMD *cmdp;
	FREF *frp;
	int attach;
{
	SCR *new;

	/* Get a new screen. */
	if (screen_init(sp->gp, sp, &new))
		return (1);
	if (vs_split(sp, new, 0)) {
		(void)screen_end(new);
		return (1);
	}

	/* Get a backing file. */
	if (attach) {
		/* Copy file state, keep the screen and cursor the same. */
		new->ep = sp->ep;
		++new->ep->refcnt;

		new->frp = frp;
		new->frp->flags = sp->frp->flags;

		new->lno = sp->lno;
		new->cno = sp->cno;
	} else if (file_init(new, frp, NULL,
	    (FL_ISSET(cmdp->iflags, E_C_FORCE) ? FS_FORCE : 0))) {
		(void)vs_discard(new, NULL);
		(void)screen_end(new);
		return (1);
	}

	/* Create the argument list. */
	new->cargv = new->argv = ex_buildargv(sp, NULL, frp->name);

	/* Set up the switch. */
	sp->nextdisp = new;
	F_SET(sp, SC_SSWITCH);

	return (0);
}