ex_edit.c

早期freebsd实现

/*-
 * Copyright (c) 1992, 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_edit.c	8.15 (Berkeley) 3/8/94";
#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 <stdlib.h>
#include <string.h>
#include <termios.h>

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

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

/*
 * ex_edit --	:e[dit][!] [+cmd] [file]
 *		:vi[sual][!] [+cmd] [file]
 *
 * Edit a file; if none specified, re-edit the current file.  The second
 * 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.
 */
int
ex_edit(sp, ep, cmdp)
	SCR *sp;
	EXF *ep;
	EXCMDARG *cmdp;
{
	ARGS *ap;
	FREF *frp;

	frp = sp->frp;
	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,
		 * create another one.  The reason for this is that we do
		 * special exit processing of temporary files, and reusing
		 * them is tricky.
		 */
		if (frp->cname != NULL) {
			if ((frp = file_add(sp, frp, frp->cname, 1)) == NULL)
				return (1);
			set_alt_name(sp, sp->frp->cname);
		} else if (frp->name == NULL)
			if ((frp = file_add(sp, frp, NULL, 1)) == NULL)
				return (1);
		break;
	case 1:
		ap = cmdp->argv[0];
		if ((frp = file_add(sp, sp->frp, ap->bp, 1)) == NULL)
			return (1);
		set_alt_name(sp, ap->bp);
		break;
	default:
		abort();
	}

	/*
	 * Check for modifications.
	 *
	 * !!!
	 * Contrary to POSIX 1003.2-1992, autowrite did not affect :edit.
	 */
	if (F_ISSET(ep, F_MODIFIED) &&
	    ep->refcnt <= 1 && !F_ISSET(cmdp, E_FORCE)) {
		msgq(sp, M_ERR,
		    "Modified since last write; write or use ! to override.");
		return (1);
	}

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