1// SPDX-License-Identifier: GPL-2.0+
2/*
3 *  inputbox.c -- implements the input 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
11char dialog_input_result[MAX_LEN + 1];
12
13/*
14 *  Print the termination buttons
15 */
16static void print_buttons(WINDOW * dialog, int height, int width, int selected)
17{
18	int x = width / 2 - 11;
19	int y = height - 2;
20
21	print_button(dialog, "  Ok  ", y, x, selected == 0);
22	print_button(dialog, " Help ", y, x + 14, selected == 1);
23
24	wmove(dialog, y, x + 1 + 14 * selected);
25	wrefresh(dialog);
26}
27
28/*
29 * Display a dialog box for inputing a string
30 */
31int dialog_inputbox(const char *title, const char *prompt, int height, int width,
32		    const char *init)
33{
34	int i, x, y, box_y, box_x, box_width;
35	int input_x = 0, key = 0, button = -1;
36	int show_x, len, pos;
37	char *instr = dialog_input_result;
38	WINDOW *dialog;
39
40	if (!init)
41		instr[0] = '\0';
42	else
43		strcpy(instr, init);
44
45do_resize:
46	if (getmaxy(stdscr) <= (height - INPUTBOX_HEIGHT_MIN))
47		return -ERRDISPLAYTOOSMALL;
48	if (getmaxx(stdscr) <= (width - INPUTBOX_WIDTH_MIN))
49		return -ERRDISPLAYTOOSMALL;
50
51	/* center dialog box on screen */
52	x = (getmaxx(stdscr) - width) / 2;
53	y = (getmaxy(stdscr) - height) / 2;
54
55	draw_shadow(stdscr, y, x, height, width);
56
57	dialog = newwin(height, width, y, x);
58	keypad(dialog, TRUE);
59
60	draw_box(dialog, 0, 0, height, width,
61		 dlg.dialog.atr, dlg.border.atr);
62	wattrset(dialog, dlg.border.atr);
63	mvwaddch(dialog, height - 3, 0, ACS_LTEE);
64	for (i = 0; i < width - 2; i++)
65		waddch(dialog, ACS_HLINE);
66	wattrset(dialog, dlg.dialog.atr);
67	waddch(dialog, ACS_RTEE);
68
69	print_title(dialog, title, width);
70
71	wattrset(dialog, dlg.dialog.atr);
72	print_autowrap(dialog, prompt, width - 2, 1, 3);
73
74	/* Draw the input field box */
75	box_width = width - 6;
76	getyx(dialog, y, x);
77	box_y = y + 2;
78	box_x = (width - box_width) / 2;
79	draw_box(dialog, y + 1, box_x - 1, 3, box_width + 2,
80		 dlg.dialog.atr, dlg.border.atr);
81
82	print_buttons(dialog, height, width, 0);
83
84	/* Set up the initial value */
85	wmove(dialog, box_y, box_x);
86	wattrset(dialog, dlg.inputbox.atr);
87
88	len = strlen(instr);
89	pos = len;
90
91	if (len >= box_width) {
92		show_x = len - box_width + 1;
93		input_x = box_width - 1;
94		for (i = 0; i < box_width - 1; i++)
95			waddch(dialog, instr[show_x + i]);
96	} else {
97		show_x = 0;
98		input_x = len;
99		waddstr(dialog, instr);
100	}
101
102	wmove(dialog, box_y, box_x + input_x);
103
104	wrefresh(dialog);
105
106	while (key != KEY_ESC) {
107		key = wgetch(dialog);
108
109		if (button == -1) {	/* Input box selected */
110			switch (key) {
111			case TAB:
112			case KEY_UP:
113			case KEY_DOWN:
114				break;
115			case KEY_BACKSPACE:
116			case 8:   /* ^H */
117			case 127: /* ^? */
118				if (pos) {
119					wattrset(dialog, dlg.inputbox.atr);
120					if (input_x == 0) {
121						show_x--;
122					} else
123						input_x--;
124
125					if (pos < len) {
126						for (i = pos - 1; i < len; i++) {
127							instr[i] = instr[i+1];
128						}
129					}
130
131					pos--;
132					len--;
133					instr[len] = '\0';
134					wmove(dialog, box_y, box_x);
135					for (i = 0; i < box_width; i++) {
136						if (!instr[show_x + i]) {
137							waddch(dialog, ' ');
138							break;
139						}
140						waddch(dialog, instr[show_x + i]);
141					}
142					wmove(dialog, box_y, input_x + box_x);
143					wrefresh(dialog);
144				}
145				continue;
146			case KEY_LEFT:
147				if (pos > 0) {
148					if (input_x > 0) {
149						wmove(dialog, box_y, --input_x + box_x);
150					} else if (input_x == 0) {
151						show_x--;
152						wmove(dialog, box_y, box_x);
153						for (i = 0; i < box_width; i++) {
154							if (!instr[show_x + i]) {
155								waddch(dialog, ' ');
156								break;
157							}
158							waddch(dialog, instr[show_x + i]);
159						}
160						wmove(dialog, box_y, box_x);
161					}
162					pos--;
163				}
164				continue;
165			case KEY_RIGHT:
166				if (pos < len) {
167					if (input_x < box_width - 1) {
168						wmove(dialog, box_y, ++input_x + box_x);
169					} else if (input_x == box_width - 1) {
170						show_x++;
171						wmove(dialog, box_y, box_x);
172						for (i = 0; i < box_width; i++) {
173							if (!instr[show_x + i]) {
174								waddch(dialog, ' ');
175								break;
176							}
177							waddch(dialog, instr[show_x + i]);
178						}
179						wmove(dialog, box_y, input_x + box_x);
180					}
181					pos++;
182				}
183				continue;
184			default:
185				if (key < 0x100 && isprint(key)) {
186					if (len < MAX_LEN) {
187						wattrset(dialog, dlg.inputbox.atr);
188						if (pos < len) {
189							for (i = len; i > pos; i--)
190								instr[i] = instr[i-1];
191							instr[pos] = key;
192						} else {
193							instr[len] = key;
194						}
195						pos++;
196						len++;
197						instr[len] = '\0';
198
199						if (input_x == box_width - 1) {
200							show_x++;
201						} else {
202							input_x++;
203						}
204
205						wmove(dialog, box_y, box_x);
206						for (i = 0; i < box_width; i++) {
207							if (!instr[show_x + i]) {
208								waddch(dialog, ' ');
209								break;
210							}
211							waddch(dialog, instr[show_x + i]);
212						}
213						wmove(dialog, box_y, input_x + box_x);
214						wrefresh(dialog);
215					} else
216						flash();	/* Alarm user about overflow */
217					continue;
218				}
219			}
220		}
221		switch (key) {
222		case 'O':
223		case 'o':
224			delwin(dialog);
225			return 0;
226		case 'H':
227		case 'h':
228			delwin(dialog);
229			return 1;
230		case KEY_UP:
231		case KEY_LEFT:
232			switch (button) {
233			case -1:
234				button = 1;	/* Indicates "Help" button is selected */
235				print_buttons(dialog, height, width, 1);
236				break;
237			case 0:
238				button = -1;	/* Indicates input box is selected */
239				print_buttons(dialog, height, width, 0);
240				wmove(dialog, box_y, box_x + input_x);
241				wrefresh(dialog);
242				break;
243			case 1:
244				button = 0;	/* Indicates "OK" button is selected */
245				print_buttons(dialog, height, width, 0);
246				break;
247			}
248			break;
249		case TAB:
250		case KEY_DOWN:
251		case KEY_RIGHT:
252			switch (button) {
253			case -1:
254				button = 0;	/* Indicates "OK" button is selected */
255				print_buttons(dialog, height, width, 0);
256				break;
257			case 0:
258				button = 1;	/* Indicates "Help" button is selected */
259				print_buttons(dialog, height, width, 1);
260				break;
261			case 1:
262				button = -1;	/* Indicates input box is selected */
263				print_buttons(dialog, height, width, 0);
264				wmove(dialog, box_y, box_x + input_x);
265				wrefresh(dialog);
266				break;
267			}
268			break;
269		case ' ':
270		case '\n':
271			delwin(dialog);
272			return (button == -1 ? 0 : button);
273		case 'X':
274		case 'x':
275			key = KEY_ESC;
276			break;
277		case KEY_ESC:
278			key = on_key_esc(dialog);
279			break;
280		case KEY_RESIZE:
281			delwin(dialog);
282			on_key_resize();
283			goto do_resize;
284		}
285	}
286
287	delwin(dialog);
288	return KEY_ESC;		/* ESC pressed */
289}
290