1 /*        $NetBSD: insch.c,v 1.29 2024/12/23 02:58:03 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[] = "@(#)insch.c     8.2 (Berkeley) 5/4/94";
36 #else
37 __RCSID("$NetBSD: insch.c,v 1.29 2024/12/23 02:58:03 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 /*
50  * insch --
51  *        Do an insert-char on the line, leaving (cury, curx) unchanged.
52  */
53 int
insch(chtype ch)54 insch(chtype ch)
55 {
56 
57           return winsch(stdscr, ch);
58 }
59 
60 /*
61  * mvinsch --
62  *        Do an insert-char on the line at (y, x).
63  */
64 int
mvinsch(int y,int x,chtype ch)65 mvinsch(int y, int x, chtype ch)
66 {
67 
68           return mvwinsch(stdscr, y, x, ch);
69 }
70 
71 /*
72  * mvwinsch --
73  *        Do an insert-char on the line at (y, x) in the given window.
74  */
75 int
mvwinsch(WINDOW * win,int y,int x,chtype ch)76 mvwinsch(WINDOW *win, int y, int x, chtype ch)
77 {
78 
79           if (wmove(win, y, x) == ERR)
80                     return ERR;
81 
82           return winsch(win, ch);
83 }
84 
85 #endif
86 
87 /*
88  * winsch --
89  *        Do an insert-char on the line, leaving (cury, curx) unchanged.
90  */
91 int
winsch(WINDOW * win,chtype ch)92 winsch(WINDOW *win, chtype ch)
93 {
94           __LDATA   *end, *temp1, *temp2;
95           attr_t attr;
96 
97           if (__predict_false(win == NULL))
98                     return ERR;
99 
100           if (__using_color)
101                     attr = win->battr & __COLOR;
102           else
103                     attr = 0;
104           end = &win->alines[win->cury]->line[win->curx];
105           temp1 = &win->alines[win->cury]->line[win->maxx - 1];
106           temp2 = temp1 - 1;
107           while (temp1 > end) {
108                     (void)memcpy(temp1, temp2, sizeof(__LDATA));
109                     temp1--, temp2--;
110           }
111           temp1->ch = (wchar_t)ch & __CHARTEXT;
112           if (temp1->ch == win->bch) {
113                     temp1->ch = win->bch;
114                     temp1->cflags &= ~CA_CONTINUATION;
115                     temp1->cflags |= CA_BACKGROUND;
116           } else {
117                     temp1->cflags &= ~ CA_BACKGROUND;
118           }
119 
120           temp1->attr = (attr_t) ch & __ATTRIBUTES;
121           if (temp1->attr & __COLOR)
122                     temp1->attr |= (win->battr & ~__COLOR);
123           else
124                     temp1->attr |= win->battr;
125 #ifdef HAVE_WCHAR
126           if (_cursesi_copy_nsp(win->bnsp, temp1) == ERR)
127                     return ERR;
128           temp1->wcols = 1;
129 #endif /* HAVE_WCHAR */
130           __touchline(win, (int)win->cury, (int)win->curx, (int)win->maxx - 1);
131           if (win->cury == LINES - 1 &&
132               (win->alines[LINES - 1]->line[COLS - 1].ch != ' ' ||
133                     win->alines[LINES - 1]->line[COLS - 1].attr != attr)) {
134                     if (win->flags & __SCROLLOK) {
135                               wrefresh(win);
136                               scroll(win);
137                               win->cury--;
138                     } else
139                               return ERR;
140           }
141           return OK;
142 }
143