1 /* $NetBSD: delch.c,v 1.30 2022/10/19 06:09:27 blymn Exp $ */
2
3 /*
4 * Copyright (c) 1981, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)delch.c 8.2 (Berkeley) 5/4/94";
36 #else
37 __RCSID("$NetBSD: delch.c,v 1.30 2022/10/19 06:09:27 blymn Exp $");
38 #endif
39 #endif /* not lint */
40
41 #include <string.h>
42 #include <stdlib.h>
43
44 #include "curses.h"
45 #include "curses_private.h"
46
47 #ifndef _CURSES_USE_MACROS
48 /*
49 * delch --
50 * Do a delete-char on the line, leaving (cury, curx) unchanged.
51 */
52 int
delch(void)53 delch(void)
54 {
55 return wdelch(stdscr);
56 }
57
58 /*
59 * mvdelch --
60 * Do a delete-char on the line at (y, x) on stdscr.
61 */
62 int
mvdelch(int y,int x)63 mvdelch(int y, int x)
64 {
65 return mvwdelch(stdscr, y, x);
66 }
67
68 /*
69 * mvwdelch --
70 * Do a delete-char on the line at (y, x) of the given window.
71 */
72 int
mvwdelch(WINDOW * win,int y,int x)73 mvwdelch(WINDOW *win, int y, int x)
74 {
75 if (wmove(win, y, x) == ERR)
76 return ERR;
77
78 return wdelch(win);
79 }
80
81 #endif
82
83 /*
84 * wdelch --
85 * Do a delete-char on the line, leaving (cury, curx) unchanged.
86 */
87 int
wdelch(WINDOW * win)88 wdelch(WINDOW *win)
89 {
90 __LDATA *end, *temp1, *temp2;
91
92 #ifndef HAVE_WCHAR
93 end = &win->alines[win->cury]->line[win->maxx - 1];
94 temp1 = &win->alines[win->cury]->line[win->curx];
95 temp2 = temp1 + 1;
96 while (temp1 < end) {
97 (void)memcpy(temp1, temp2, sizeof(__LDATA));
98 temp1++, temp2++;
99 }
100 temp1->ch = win->bch;
101 temp1->cflags = CA_BACKGROUND;
102 if (__using_color && win != curscr)
103 temp1->attr = win->battr & __COLOR;
104 else
105 temp1->attr = 0;
106 __touchline(win, (int)win->cury, (int)win->curx, (int)win->maxx - 1);
107 return OK;
108 #else
109 int cw, sx;
110 nschar_t *np, *tnp;
111
112 end = &win->alines[win->cury]->line[win->maxx - 1];
113 sx = win->curx;
114 temp1 = &win->alines[win->cury]->line[win->curx];
115 cw = temp1->wcols;
116 if (cw < 0) {
117 temp1 += cw;
118 sx += cw;
119 cw = temp1->wcols;
120 }
121 np = temp1->nsp;
122 if (np) {
123 while (np) {
124 tnp = np->next;
125 free(np);
126 np = tnp;
127 }
128 temp1->nsp = NULL;
129 }
130 if (sx + cw < win->maxx) {
131 temp2 = temp1 + cw;
132 while (temp1 < end - (cw - 1)) {
133 (void)memcpy(temp1, temp2, sizeof(__LDATA));
134 temp1++, temp2++;
135 }
136 }
137 while (temp1 <= end) {
138 temp1->ch = win->bch;
139 temp1->cflags |= CA_BACKGROUND;
140 temp1->cflags &= ~CA_CONTINUATION;
141 temp1->attr = win->battr;
142 if (_cursesi_copy_nsp(win->bnsp, temp1) == ERR)
143 return ERR;
144 temp1->wcols = 1;
145 temp1++;
146 }
147 __touchline(win, (int)win->cury, sx, (int)win->maxx - 1);
148 __sync(win);
149 return OK;
150 #endif /* HAVE_WCHAR */
151 }
152