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/* $NetBSD: wwdelchar.c,v 1.4 1996/02/08 21:49:00 mycroft Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Edward Wang at The University of California, Berkeley.
*
* 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
#if 0
static char sccsid[] = "@(#)wwdelchar.c 8.1 (Berkeley) 6/6/93";
#else
static char rcsid[] = "$NetBSD: wwdelchar.c,v 1.4 1996/02/08 21:49:00 mycroft Exp $";
#endif
#endif /* not lint */
#include "ww.h"
#include "tt.h"
wwdelchar(w, row, col)
register struct ww *w;
{
register i;
int nvis;
/*
* First, shift the line.
*/
{
register union ww_char *p, *q;
p = &w->ww_buf[row][col];
q = p + 1;
for (i = w->ww_b.r - col; --i > 0;)
*p++ = *q++;
p->c_w = ' ';
}
/*
* If can't see it, just return.
*/
if (row < w->ww_i.t || row >= w->ww_i.b
|| w->ww_i.r <= 0 || w->ww_i.r <= col)
return;
if (col < w->ww_i.l)
col = w->ww_i.l;
/*
* Now find out how much is actually changed, and fix wwns.
*/
{
register union ww_char *buf;
register char *win;
register union ww_char *ns;
register unsigned char *smap;
char touched;
nvis = 0;
smap = &wwsmap[row][col];
for (i = col; i < w->ww_i.r && *smap++ != w->ww_index; i++)
;
if (i >= w->ww_i.r)
return;
col = i;
buf = w->ww_buf[row];
win = w->ww_win[row];
ns = wwns[row];
smap = &wwsmap[row][i];
touched = wwtouched[row];
for (; i < w->ww_i.r; i++) {
if (*smap++ != w->ww_index)
continue;
touched |= WWU_TOUCHED;
if (win[i])
ns[i].c_w =
buf[i].c_w ^ win[i] << WWC_MSHIFT;
else {
nvis++;
ns[i] = buf[i];
}
}
wwtouched[row] = touched;
}
/*
* Can/Should we use delete character?
*/
if (tt.tt_delchar != 0 && nvis > (wwncol - col) / 2) {
register union ww_char *p, *q;
xxdelchar(row, col);
p = &wwos[row][col];
q = p + 1;
for (i = wwncol - col; --i > 0;)
*p++ = *q++;
p->c_w = ' ';
}
}
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