BSD 4_4 release

[unix-history] / usr / src / contrib / nvi / nvi / vi / v_z.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_z.c       8.1 (Berkeley) 6/9/93";
#endif /* not lint */

#include <sys/types.h>

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

/*
* v_z -- [count]z[count][.-<CR>]
*      Move the screen.
*/
int
v_z(sp, ep, vp, fm, tm, rp)
       SCR *sp;
       EXF *ep;
       VICMDARG *vp;
       MARK *fm, *tm, *rp;
{
       recno_t last, lno;

       /*
        * The first count is the line to use.  If the value doesn't
        * exist, use the last line.
        */
       if (F_ISSET(vp, VC_C1SET)) {
               lno = vp->count;
               if (file_lline(sp, ep, &last))
                       return (1);
               if (lno > last)
                       lno = last;
       } else
               lno = fm->lno;

       /* The second count is the window size. */
       if (F_ISSET(vp, VC_C2SET) && set_window_size(sp, vp->count2))
               return (1);

       switch(vp->character) {
       case '.':
               if (sp->s_fill(sp, ep, lno, P_MIDDLE))
                       return (1);
               break;
       case '-':
               if (sp->s_fill(sp, ep, lno, P_BOTTOM))
                       return (1);
               break;
       default:
               if (sp->special[vp->character] == K_CR) {
                       if (sp->s_fill(sp, ep, lno, P_TOP))
                               return (1);
                       break;
               }
               msgq(sp, M_ERR, "usage: %s.", vp->kp->usage);
               return (1);
       }

       /* If the map changes, have to redraw the entire screen. */
       F_SET(sp, S_REDRAW);

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