BSD 4_4 release

[unix-history] / usr / src / contrib / nvi / nvi / svi / svi_get.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[] = "@(#)svi_get.c   8.1 (Berkeley) 6/9/93";
#endif /* not lint */

#include <sys/types.h>

#include <ctype.h>
#include <curses.h>
#include <errno.h>
#include <stdlib.h>

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

/*
* svi_get --
*      Fill a buffer from the terminal for vi.  The approach is that we
*      fake like the user is doing input on the last line of the screen.
*      This makes all of the scrolling work correctly, and allows us the
*      use of the vi text editing routines, not to mention essentially
*      infinite length ex commands.
*/
int
svi_get(sp, ep, hp, prompt, flags)
       SCR *sp;
       EXF *ep;
       HDR *hp;
       int prompt;
       u_int flags;
{
       MARK save;
       recno_t bot_lno, top_lno;
       size_t bot_off, top_off;
       int eval;

       /* Save where we are. */
       bot_lno = TMAP->lno;
       bot_off = TMAP->off;
       top_lno = HMAP->lno;
       top_off = HMAP->off;
       save.lno = sp->lno;
       save.cno = sp->cno;

       /* Fake it. */
       sp->t_smap[1].lno = sp->t_smap[0].lno + 1;
       sp->t_smap[1].off = 1;
       sp->lno = sp->t_smap[0].lno + 1;
       sp->cno = 0;
       ++sp->t_smap;
       ++sp->t_rows;

       /*
        * Historic vi allowed you to use abbreviations on the command line.
        * To implement this, add TXT_MAPINPUT to the flags for the v_ntext()
        * routine.  This is necessary but not sufficient -- v_ntext() will
        * have to be modified to make available a copy of the original line
        * without abbreviations, or the :unabbreviate command won't work.
        */
       eval = v_ntext(sp, ep, &sp->bhdr, NULL, NULL,
           0, NULL, prompt, 0, flags | TXT_APPENDEOL | TXT_CR | TXT_ESCAPE);

       /* Put it all back. */
       --sp->t_rows;
       --sp->t_smap;
       sp->lno = save.lno;
       sp->cno = save.cno;

       /*
        * The map may be wrong if the user entered more than one
        * (logical) line.  Fix it.  If the user entered a whole
        * screen, this will be slow, but it's not worth caring.
        */
       while (bot_lno != TMAP->lno || bot_off != TMAP->off)
               if (svi_sm_1down(sp, ep))
                       return (1);

       if (svi_refresh(sp, ep))
               return (1);

       return (eval);
}