/*      $OpenBSD: v_xchar.c,v 1.8 2016/01/06 22:28:52 millert Exp $     */

/*-
 * 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"

#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_xchar -- [buffer] [count]x
 *      Deletes the character(s) on which the cursor sits.
 *
 * PUBLIC: int v_xchar(SCR *, VICMD *);
 */
int
v_xchar(SCR *sp, VICMD *vp)
{
        size_t len;
        int isempty;

        if (db_eget(sp, vp->m_start.lno, NULL, &len, &isempty)) {
                if (isempty)
                        goto nodel;
                return (1);
        }
        if (len == 0) {
nodel:          msgq(sp, M_BERR, "No characters to delete");
                return (1);
        }

        /*
         * Delete from the cursor toward the end of line, w/o moving the
         * cursor.
         *
         * !!!
         * Note, "2x" at EOL isn't the same as "xx" because the left movement
         * of the cursor as part of the 'x' command isn't taken into account.
         * Historically correct.
         */
        if (F_ISSET(vp, VC_C1SET))
                vp->m_stop.cno += vp->count - 1;
        if (vp->m_stop.cno >= len - 1) {
                vp->m_stop.cno = len - 1;
                vp->m_final.cno = vp->m_start.cno ? vp->m_start.cno - 1 : 0;
        } else
                vp->m_final.cno = vp->m_start.cno;

        if (cut(sp,
            F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
            &vp->m_start, &vp->m_stop, 0))
                return (1);
        return (del(sp, &vp->m_start, &vp->m_stop, 0));
}

/*
 * v_Xchar -- [buffer] [count]X
 *      Deletes the character(s) immediately before the current cursor
 *      position.
 *
 * PUBLIC: int v_Xchar(SCR *, VICMD *);
 */
int
v_Xchar(SCR *sp, VICMD *vp)
{
        u_long cnt;

        if (vp->m_start.cno == 0) {
                v_sol(sp);
                return (1);
        }

        cnt = F_ISSET(vp, VC_C1SET) ? vp->count : 1;
        if (cnt >= vp->m_start.cno)
                vp->m_start.cno = 0;
        else
                vp->m_start.cno -= cnt;
        --vp->m_stop.cno;
        vp->m_final.cno = vp->m_start.cno;

        if (cut(sp,
            F_ISSET(vp, VC_BUFFER) ? &vp->buffer : NULL,
            &vp->m_start, &vp->m_stop, 0))
                return (1);
        return (del(sp, &vp->m_start, &vp->m_stop, 0));
}