1/*	$NetBSD: wwdelline.c,v 1.5 2002/06/14 01:06:58 wiz Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Edward Wang at The University of California, Berkeley.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)wwdelline.c	8.1 (Berkeley) 6/6/93";
39#else
40__RCSID("$NetBSD: wwdelline.c,v 1.5 2002/06/14 01:06:58 wiz Exp $");
41#endif
42#endif /* not lint */
43
44#include "ww.h"
45
46void
47wwdelline(struct ww *w, int row)
48{
49	int i;
50	union ww_char **cpp, **cqq;
51	union ww_char *cp;
52	int row1, row2;
53	char deleted;
54	int visible;
55
56	/*
57	 * Scroll first.
58	 */
59	if ((row1 = row) < w->ww_i.t) {
60		row1 = w->ww_i.t;
61	}
62	if ((row2 = w->ww_b.b) > w->ww_i.b) {
63		row2 = w->ww_i.b;
64		visible = 0;
65	} else
66		visible = 1;
67	deleted = wwscroll1(w, row1, row2, 1, visible);
68
69	/*
70	 * Fix the buffer.
71	 * But leave clearing the last line for wwclreol().
72	 */
73	cpp = &w->ww_buf[row];
74	cqq = cpp + 1;
75	cp = *cpp;
76	for (i = w->ww_b.b - row; --i > 0;)
77		*cpp++ = *cqq++;
78	*cpp = cp;
79
80	/*
81	 * Now clear the last line.
82	 */
83	if (visible)
84		wwclreol1(w, w->ww_b.b - 1, w->ww_b.l, deleted);
85	else {
86		cp += w->ww_b.l;
87		for (i = w->ww_b.nc; --i >= 0;)
88			cp++->c_w = ' ';
89	}
90}
91