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(win: dialog, label: " Ok ", y, x, selected: selected == 0);
22 print_button(win: dialog, label: " Help ", y, x: x + 14, selected: 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 strncpy(dest: instr, src: init, n: sizeof(dialog_input_result) - 1);
44 instr[sizeof(dialog_input_result) - 1] = '\0';
45 }
46
47do_resize:
48 if (getmaxy(stdscr) <= (height - INPUTBOX_HEIGHT_MIN))
49 return -ERRDISPLAYTOOSMALL;
50 if (getmaxx(stdscr) <= (width - INPUTBOX_WIDTH_MIN))
51 return -ERRDISPLAYTOOSMALL;
52
53 /* center dialog box on screen */
54 x = (getmaxx(stdscr) - width) / 2;
55 y = (getmaxy(stdscr) - height) / 2;
56
57 draw_shadow(win: stdscr, y, x, height, width);
58
59 dialog = newwin(height, width, y, x);
60 keypad(dialog, TRUE);
61
62 draw_box(win: dialog, y: 0, x: 0, height, width,
63 box: dlg.dialog.atr, border: dlg.border.atr);
64 wattrset(dialog, dlg.border.atr);
65 mvwaddch(dialog, height - 3, 0, ACS_LTEE);
66 for (i = 0; i < width - 2; i++)
67 waddch(dialog, ACS_HLINE);
68 wattrset(dialog, dlg.dialog.atr);
69 waddch(dialog, ACS_RTEE);
70
71 print_title(dialog, title, width);
72
73 wattrset(dialog, dlg.dialog.atr);
74 print_autowrap(win: dialog, prompt, width: width - 2, y: 1, x: 3);
75
76 /* Draw the input field box */
77 box_width = width - 6;
78 getyx(dialog, y, x);
79 box_y = y + 2;
80 box_x = (width - box_width) / 2;
81 draw_box(win: dialog, y: y + 1, x: box_x - 1, height: 3, width: box_width + 2,
82 box: dlg.dialog.atr, border: dlg.border.atr);
83
84 print_buttons(dialog, height, width, selected: 0);
85
86 /* Set up the initial value */
87 wmove(dialog, box_y, box_x);
88 wattrset(dialog, dlg.inputbox.atr);
89
90 len = strlen(s: instr);
91 pos = len;
92
93 if (len >= box_width) {
94 show_x = len - box_width + 1;
95 input_x = box_width - 1;
96 for (i = 0; i < box_width - 1; i++)
97 waddch(dialog, instr[show_x + i]);
98 } else {
99 show_x = 0;
100 input_x = len;
101 waddstr(dialog, instr);
102 }
103
104 wmove(dialog, box_y, box_x + input_x);
105
106 wrefresh(dialog);
107
108 while (key != KEY_ESC) {
109 key = wgetch(dialog);
110
111 if (button == -1) { /* Input box selected */
112 switch (key) {
113 case TAB:
114 case KEY_UP:
115 case KEY_DOWN:
116 break;
117 case KEY_BACKSPACE:
118 case 8: /* ^H */
119 case 127: /* ^? */
120 if (pos) {
121 wattrset(dialog, dlg.inputbox.atr);
122 if (input_x == 0) {
123 show_x--;
124 } else
125 input_x--;
126
127 if (pos < len) {
128 for (i = pos - 1; i < len; i++) {
129 instr[i] = instr[i+1];
130 }
131 }
132
133 pos--;
134 len--;
135 instr[len] = '\0';
136 wmove(dialog, box_y, box_x);
137 for (i = 0; i < box_width; i++) {
138 if (!instr[show_x + i]) {
139 waddch(dialog, ' ');
140 break;
141 }
142 waddch(dialog, instr[show_x + i]);
143 }
144 wmove(dialog, box_y, input_x + box_x);
145 wrefresh(dialog);
146 }
147 continue;
148 case KEY_LEFT:
149 if (pos > 0) {
150 if (input_x > 0) {
151 wmove(dialog, box_y, --input_x + box_x);
152 } else if (input_x == 0) {
153 show_x--;
154 wmove(dialog, box_y, box_x);
155 for (i = 0; i < box_width; i++) {
156 if (!instr[show_x + i]) {
157 waddch(dialog, ' ');
158 break;
159 }
160 waddch(dialog, instr[show_x + i]);
161 }
162 wmove(dialog, box_y, box_x);
163 }
164 pos--;
165 }
166 continue;
167 case KEY_RIGHT:
168 if (pos < len) {
169 if (input_x < box_width - 1) {
170 wmove(dialog, box_y, ++input_x + box_x);
171 } else if (input_x == box_width - 1) {
172 show_x++;
173 wmove(dialog, box_y, box_x);
174 for (i = 0; i < box_width; i++) {
175 if (!instr[show_x + i]) {
176 waddch(dialog, ' ');
177 break;
178 }
179 waddch(dialog, instr[show_x + i]);
180 }
181 wmove(dialog, box_y, input_x + box_x);
182 }
183 pos++;
184 }
185 continue;
186 default:
187 if (key < 0x100 && isprint(key)) {
188 if (len < MAX_LEN) {
189 wattrset(dialog, dlg.inputbox.atr);
190 if (pos < len) {
191 for (i = len; i > pos; i--)
192 instr[i] = instr[i-1];
193 instr[pos] = key;
194 } else {
195 instr[len] = key;
196 }
197 pos++;
198 len++;
199 instr[len] = '\0';
200
201 if (input_x == box_width - 1) {
202 show_x++;
203 } else {
204 input_x++;
205 }
206
207 wmove(dialog, box_y, box_x);
208 for (i = 0; i < box_width; i++) {
209 if (!instr[show_x + i]) {
210 waddch(dialog, ' ');
211 break;
212 }
213 waddch(dialog, instr[show_x + i]);
214 }
215 wmove(dialog, box_y, input_x + box_x);
216 wrefresh(dialog);
217 } else
218 flash(); /* Alarm user about overflow */
219 continue;
220 }
221 }
222 }
223 switch (key) {
224 case 'O':
225 case 'o':
226 delwin(dialog);
227 return 0;
228 case 'H':
229 case 'h':
230 delwin(dialog);
231 return 1;
232 case KEY_UP:
233 case KEY_LEFT:
234 switch (button) {
235 case -1:
236 button = 1; /* Indicates "Help" button is selected */
237 print_buttons(dialog, height, width, selected: 1);
238 break;
239 case 0:
240 button = -1; /* Indicates input box is selected */
241 print_buttons(dialog, height, width, selected: 0);
242 wmove(dialog, box_y, box_x + input_x);
243 wrefresh(dialog);
244 break;
245 case 1:
246 button = 0; /* Indicates "OK" button is selected */
247 print_buttons(dialog, height, width, selected: 0);
248 break;
249 }
250 break;
251 case TAB:
252 case KEY_DOWN:
253 case KEY_RIGHT:
254 switch (button) {
255 case -1:
256 button = 0; /* Indicates "OK" button is selected */
257 print_buttons(dialog, height, width, selected: 0);
258 break;
259 case 0:
260 button = 1; /* Indicates "Help" button is selected */
261 print_buttons(dialog, height, width, selected: 1);
262 break;
263 case 1:
264 button = -1; /* Indicates input box is selected */
265 print_buttons(dialog, height, width, selected: 0);
266 wmove(dialog, box_y, box_x + input_x);
267 wrefresh(dialog);
268 break;
269 }
270 break;
271 case ' ':
272 case '\n':
273 delwin(dialog);
274 return (button == -1 ? 0 : button);
275 case 'X':
276 case 'x':
277 key = KEY_ESC;
278 break;
279 case KEY_ESC:
280 key = on_key_esc(win: dialog);
281 break;
282 case KEY_RESIZE:
283 delwin(dialog);
284 on_key_resize();
285 goto do_resize;
286 }
287 }
288
289 delwin(dialog);
290 return KEY_ESC; /* ESC pressed */
291}
292

source code of linux/scripts/kconfig/lxdialog/inputbox.c