NetBSD/usr.bin/vi/ex/ex_preserve.c

/*-
 * Copyright (c) 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static char sccsid[] = "@(#)ex_preserve.c	8.14 (Berkeley) 8/17/94";
#endif /* not lint */

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

#include <bitstring.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <termios.h>

#include "compat.h"
#include <db.h>
#include <regex.h>

#include "vi.h"
#include "excmd.h"

/*
 * ex_preserve -- :pre[serve]
 *	Push the file to recovery.
 */
int
ex_preserve(sp, ep, cmdp)
	SCR *sp;
	EXF *ep;
	EXCMDARG *cmdp;
{
	recno_t lno;

	if (!F_ISSET(ep, F_RCV_ON)) {
		msgq(sp, M_ERR, "Preservation of this file not possible");
		return (1);
	}

	/* If recovery not initialized, do so. */
	if (F_ISSET(ep, F_FIRSTMODIFY) && rcv_init(sp, ep))
		return (1);

	/* Force the file to be read in, in case it hasn't yet. */
	if (file_lline(sp, ep, &lno))
		return (1);

	/* Sync to disk. */
	if (rcv_sync(sp, ep, RCV_SNAPSHOT))
		return (1);

	msgq(sp, M_INFO, "File preserved");
	return (0);
}

/*
 * ex_recover -- :rec[over][!] file
 *
 * Recover the file.
 */
int
ex_recover(sp, ep, cmdp)
	SCR *sp;
	EXF *ep;
	EXCMDARG *cmdp;
{
	ARGS *ap;
	FREF *frp;

	ap = cmdp->argv[0];

	/* Set the alternate file name. */
	set_alt_name(sp, ap->bp);

	/*
	 * Check for modifications.  Autowrite did not historically
	 * affect :recover.
	 */
	if (file_m2(sp, ep, F_ISSET(cmdp, E_FORCE)))
		return (1);

	/* Get a file structure for the file. */
	if ((frp = file_add(sp, ap->bp)) == NULL)
		return (1);

	/* Set the recover bit. */
	F_SET(frp, FR_RECOVER);

	/* Switch files. */
	if (file_init(sp, frp, NULL, F_ISSET(cmdp, E_FORCE)))
		return (1);
	F_SET(sp, S_FSWITCH);
	return (0);
}