1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  *  yesno.c -- implements the yes/no box
4  *
5  *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
6  *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
7  */
8 
9 #include "dialog.h"
10 
11 /*
12  * Display termination buttons
13  */
14 static void print_buttons(WINDOW * dialog, int height, int width, int selected)
15 {
16 	int x = width / 2 - 10;
17 	int y = height - 2;
18 
19 	print_button(dialog, gettext(" Yes "), y, x, selected == 0);
20 	print_button(dialog, gettext("  No  "), y, x + 13, selected == 1);
21 
22 	wmove(dialog, y, x + 1 + 13 * selected);
23 	wrefresh(dialog);
24 }
25 
26 /*
27  * Display a dialog box with two buttons - Yes and No
28  */
29 int dialog_yesno(const char *title, const char *prompt, int height, int width)
30 {
31 	int i, x, y, key = 0, button = 0;
32 	WINDOW *dialog;
33 
34 do_resize:
35 	if (getmaxy(stdscr) < (height + YESNO_HEIGTH_MIN))
36 		return -ERRDISPLAYTOOSMALL;
37 	if (getmaxx(stdscr) < (width + YESNO_WIDTH_MIN))
38 		return -ERRDISPLAYTOOSMALL;
39 
40 	/* center dialog box on screen */
41 	x = (getmaxx(stdscr) - width) / 2;
42 	y = (getmaxy(stdscr) - height) / 2;
43 
44 	draw_shadow(stdscr, y, x, height, width);
45 
46 	dialog = newwin(height, width, y, x);
47 	keypad(dialog, TRUE);
48 
49 	draw_box(dialog, 0, 0, height, width,
50 		 dlg.dialog.atr, dlg.border.atr);
51 	wattrset(dialog, dlg.border.atr);
52 	mvwaddch(dialog, height - 3, 0, ACS_LTEE);
53 	for (i = 0; i < width - 2; i++)
54 		waddch(dialog, ACS_HLINE);
55 	wattrset(dialog, dlg.dialog.atr);
56 	waddch(dialog, ACS_RTEE);
57 
58 	print_title(dialog, title, width);
59 
60 	wattrset(dialog, dlg.dialog.atr);
61 	print_autowrap(dialog, prompt, width - 2, 1, 3);
62 
63 	print_buttons(dialog, height, width, 0);
64 
65 	while (key != KEY_ESC) {
66 		key = wgetch(dialog);
67 		switch (key) {
68 		case 'Y':
69 		case 'y':
70 			delwin(dialog);
71 			return 0;
72 		case 'N':
73 		case 'n':
74 			delwin(dialog);
75 			return 1;
76 
77 		case TAB:
78 		case KEY_LEFT:
79 		case KEY_RIGHT:
80 			button = ((key == KEY_LEFT ? --button : ++button) < 0) ? 1 : (button > 1 ? 0 : button);
81 
82 			print_buttons(dialog, height, width, button);
83 			wrefresh(dialog);
84 			break;
85 		case ' ':
86 		case '\n':
87 			delwin(dialog);
88 			return button;
89 		case KEY_ESC:
90 			key = on_key_esc(dialog);
91 			break;
92 		case KEY_RESIZE:
93 			delwin(dialog);
94 			on_key_resize();
95 			goto do_resize;
96 		}
97 	}
98 
99 	delwin(dialog);
100 	return key;		/* ESC pressed */
101 }
102