BSD 4_4_Lite2 release

[unix-history] / usr / src / contrib / nvi.1.43 / vi / v_xchar.c

/*-
* 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_xchar.c   9.1 (Berkeley) 11/9/94";
#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_xchar -- [buffer] [count]x
*      Deletes the character(s) on which the cursor sits.
*/
int
v_xchar(sp, vp)
       SCR *sp;
       VICMDARG *vp;
{
       recno_t lno;
       size_t len;

       if (file_gline(sp, vp->m_start.lno, &len) == NULL) {
               if (file_lline(sp, &lno))
                       return (1);
               if (lno == 0)
                       goto nodel;
               GETLINE_ERR(sp, vp->m_start.lno);
               return (1);
       }
       if (len == 0) {
nodel:          msgq(sp, M_BERR, "200|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 (delete(sp, &vp->m_start, &vp->m_stop, 0));
}

/*
* v_Xchar -- [buffer] [count]X
*      Deletes the character(s) immediately before the current cursor
*      position.
*/
int
v_Xchar(sp, vp)
       SCR *sp;
       VICMDARG *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 (delete(sp, &vp->m_start, &vp->m_stop, 0));
}