v_yank.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[] = "@(#)v_yank.c	8.13 (Berkeley) 3/8/94";
#endif /* not lint */

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

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

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

#include "vi.h"
#include "vcmd.h"

/*
 * v_yank -- [buffer][count]Y
 * 	     [buffer][count]y[count][motion]
 *	Yank text (or lines of text) into a cut buffer.
 *
 * !!!
 * Historic vi moved the cursor to the from MARK if it was before the current
 * cursor and on a different line, e.g., "yj" moves the cursor but "yk" and
 * "yh" do not.  Unfortunately, it's too late to change this now.  Matching
 * the historic semantics isn't easy.  The line number was always changed and
 * column movement was usually relative.  However, "y'a" moved the cursor to
 * the first non-blank of the line marked by a, while "y`a" moved the cursor
 * to the line and column marked by a.  Hopefully, the motion component code
 * got it right...   Unlike delete, we make no adjustments here.
 */
int
v_yank(sp, ep, vp)
	SCR *sp;
	EXF *ep;
	VICMDARG *vp;
{
	int lmode;

	/* The line may not exist in line mode cuts, check to be sure. */
	if (F_ISSET(vp, VM_LMODE)) {
		if (file_gline(sp, ep, vp->m_stop.lno, NULL) == NULL) {
			v_eof(sp, ep, &vp->m_start);
			return (1);
		}
		lmode = CUT_LINEMODE;
	} else
		lmode = 0;
	if (cut(sp, ep, NULL, F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
	    &vp->m_start, &vp->m_stop, lmode))
		return (1);

	sp->rptlines[L_YANKED] += (vp->m_stop.lno - vp->m_start.lno) + 1;
	return (0);
}