source: trunk/third/nvi/vi/v_right.c @ 14302

/*-
 * Copyright (c) 1992, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 * Copyright (c) 1992, 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[] = "@(#)v_right.c     10.7 (Berkeley) 3/6/96";
#endif /* not lint */

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

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

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

/*
 * v_right -- [count]' ', [count]l
 *      Move right by columns.
 *
 * PUBLIC: int v_right __P((SCR *, VICMD *));
 */
int
v_right(sp, vp)
        SCR *sp;
        VICMD *vp;
{
        size_t len;
        int isempty;

        if (db_eget(sp, vp->m_start.lno, NULL, &len, &isempty)) {
                if (isempty)
                        goto eol;
                return (1);
        }

        /* It's always illegal to move right on empty lines. */
        if (len == 0) {
eol:            v_eol(sp, NULL);
                return (1);
        }

        /*
         * Non-motion commands move to the end of the range.  Delete and
         * yank stay at the start.  Ignore others.  Adjust the end of the
         * range for motion commands.
         *
         * !!!
         * Historically, "[cdsy]l" worked at the end of a line.  Also,
         * EOL is a count sink.
         */
        vp->m_stop.cno = vp->m_start.cno +
            (F_ISSET(vp, VC_C1SET) ? vp->count : 1);
        if (vp->m_start.cno == len - 1 && !ISMOTION(vp)) {
                v_eol(sp, NULL);
                return (1);
        }
        if (vp->m_stop.cno >= len) {
                vp->m_stop.cno = len - 1;
                vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop;
        } else if (ISMOTION(vp)) {
                --vp->m_stop.cno;
                vp->m_final = vp->m_start;
        } else
                vp->m_final = vp->m_stop;
        return (0);
}

/*
 * v_dollar -- [count]$
 *      Move to the last column.
 *
 * PUBLIC: int v_dollar __P((SCR *, VICMD *));
 */
int
v_dollar(sp, vp)
        SCR *sp;
        VICMD *vp;
{
        size_t len;
        int isempty;

        /*
         * !!!
         * A count moves down count - 1 rows, so, "3$" is the same as "2j$".
         */
        if ((F_ISSET(vp, VC_C1SET) ? vp->count : 1) != 1) {
                /*
                 * !!!
                 * Historically, if the $ is a motion, and deleting from
                 * at or before the first non-blank of the line, it's a
                 * line motion, and the line motion flag is set.
                 */
                vp->m_stop.cno = 0;
                if (nonblank(sp, vp->m_start.lno, &vp->m_stop.cno))
                        return (1);
                if (ISMOTION(vp) && vp->m_start.cno <= vp->m_stop.cno)
                        F_SET(vp, VM_LMODE);

                --vp->count;
                if (v_down(sp, vp))
                        return (1);
        }

        /*
         * !!!
         * Historically, it was illegal to use $ as a motion command on
         * an empty line.  Unfortunately, even though C was historically
         * aliased to c$, it (and not c$) was special cased to work on
         * empty lines.  Since we alias C to c$ too, we have a problem.
         * To fix it, we let c$ go through, on the assumption that it's
         * not a problem for it to work.
         */
        if (db_eget(sp, vp->m_stop.lno, NULL, &len, &isempty)) {
                if (!isempty)
                        return (1);
                len = 0;
        }

        if (len == 0) {
                if (ISMOTION(vp) && !ISCMD(vp->rkp, 'c')) {
                        v_eol(sp, NULL);
                        return (1);
                }
                return (0);
        }

        /*
         * Non-motion commands move to the end of the range.  Delete
         * and yank stay at the start.  Ignore others.
         */
        vp->m_stop.cno = len ? len - 1 : 0;
        vp->m_final = ISMOTION(vp) ? vp->m_start : vp->m_stop;
        return (0);
}