4.4BSD/usr/src/contrib/nvi/nvi/vi/v_left.c

/*-
 * Copyright (c) 1992, 1993
 *	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_left.c	8.1 (Berkeley) 6/9/93";
#endif /* not lint */

#include <sys/types.h>

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

/*
 * v_left -- [count]^H, [count]h
 *	Move left by columns.
 */
int
v_left(sp, ep, vp, fm, tm, rp)
	SCR *sp;
	EXF *ep;
	VICMDARG *vp;
	MARK *fm, *tm, *rp;
{
	u_long cnt;

	cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;

	if (fm->cno == 0) {
		msgq(sp, M_BERR, "Already in the first column.");
		return (1);
	}

	rp->lno = fm->lno;
	if (fm->cno > cnt)
		rp->cno = fm->cno - cnt;
	else
		rp->cno = 0;
	return (0);
}

/*
 * v_first -- ^, _
 *	Move to the first non-blank column on this line.
 */
int
v_first(sp, ep, vp, fm, tm, rp)
	SCR *sp;
	EXF *ep;
	VICMDARG *vp;
	MARK *fm, *tm, *rp;
{
	rp->lno = fm->lno;
	return (0);
}

/*
 * v_ncol -- [count]|
 *	Move to column count or the first column on this line.  If the
 *	requested column is past EOL, move to EOL.  The nasty part is
 *	that we have to know character column widths to make this work.
 */
int
v_ncol(sp, ep, vp, fm, tm, rp)
	SCR *sp;
	EXF *ep;
	VICMDARG *vp;
	MARK *fm, *tm, *rp;
{
	if (F_ISSET(vp, VC_C1SET) && vp->count > 1)
		rp->cno =
		    sp->s_chposition(sp, ep, fm->lno, (size_t)--vp->count);
	else
		rp->cno = 0;
	rp->lno = fm->lno;
	return (0);
}

/*
 * v_zero -- 0
 *	Move to the first column on this line.
 */
int
v_zero(sp, ep, vp, fm, tm, rp)
	SCR *sp;
	EXF *ep;
	VICMDARG *vp;
	MARK *fm, *tm, *rp;
{
	rp->lno = fm->lno;
	rp->cno = 0;
	return (0);
}