minix/external/bsd/nvi/dist/ex/ex_preserve.c

/*	$NetBSD: ex_preserve.c,v 1.2 2013/11/22 15:52:05 christos Exp $ */
/*-
 * Copyright (c) 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1993, 1994, 1995, 1996
 *	Keith Bostic.  All rights reserved.
 *
 * See the LICENSE file for redistribution information.
 */

#include "config.h"

#ifndef lint
static const char sccsid[] = "Id: ex_preserve.c,v 10.15 2001/06/25 15:19:18 skimo Exp  (Berkeley) Date: 2001/06/25 15:19:18 ";
#endif /* not lint */

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

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

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

/*
 * ex_preserve -- :pre[serve]
 *	Push the file to recovery.
 *
 * PUBLIC: int ex_preserve __P((SCR *, EXCMD *));
 */
int
ex_preserve(SCR *sp, EXCMD *cmdp)
{
	db_recno_t lno;

	NEEDFILE(sp, cmdp);

	if (!F_ISSET(sp->ep, F_RCV_ON)) {
		msgq(sp, M_ERR, "142|Preservation of this file not possible");
		return (1);
	}

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

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

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

	msgq(sp, M_INFO, "143|File preserved");
	return (0);
}

/*
 * ex_recover -- :rec[over][!] file
 *	Recover the file.
 *
 * PUBLIC: int ex_recover __P((SCR *, EXCMD *));
 */
int
ex_recover(SCR *sp, EXCMD *cmdp)
{
	ARGS *ap;
	FREF *frp;
	const char *np;
	size_t nlen;

	ap = cmdp->argv[0];

	/* Set the alternate file name. */
	INT2CHAR(sp, ap->bp, ap->len+1, np, nlen);
	set_alt_name(sp, np);

	/*
	 * Check for modifications.  Autowrite did not historically
	 * affect :recover.
	 */
	if (file_m2(sp, FL_ISSET(cmdp->iflags, E_C_FORCE)))
		return (1);

	/* Get a file structure for the file. */
	INT2CHAR(sp, ap->bp, ap->len+1, np, nlen);
	if ((frp = file_add(sp, np)) == NULL)
		return (1);

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

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

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