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
11 char dialog_input_result[MAX_LEN + 1];
12
13 /*
14 * Print the termination buttons
15 */
print_buttons(WINDOW * dialog,int height,int width,int selected)16 static 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 */
dialog_inputbox(const char * title,const char * prompt,int height,int width,const char * init)31 int 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
45 do_resize:
46 if (getmaxy(stdscr) <= (height - INPUTBOX_HEIGTH_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 127:
117 if (pos) {
118 wattrset(dialog, dlg.inputbox.atr);
119 if (input_x == 0) {
120 show_x--;
121 } else
122 input_x--;
123
124 if (pos < len) {
125 for (i = pos - 1; i < len; i++) {
126 instr[i] = instr[i+1];
127 }
128 }
129
130 pos--;
131 len--;
132 instr[len] = '\0';
133 wmove(dialog, box_y, box_x);
134 for (i = 0; i < box_width; i++) {
135 if (!instr[show_x + i]) {
136 waddch(dialog, ' ');
137 break;
138 }
139 waddch(dialog, instr[show_x + i]);
140 }
141 wmove(dialog, box_y, input_x + box_x);
142 wrefresh(dialog);
143 }
144 continue;
145 case KEY_LEFT:
146 if (pos > 0) {
147 if (input_x > 0) {
148 wmove(dialog, box_y, --input_x + box_x);
149 } else if (input_x == 0) {
150 show_x--;
151 wmove(dialog, box_y, box_x);
152 for (i = 0; i < box_width; i++) {
153 if (!instr[show_x + i]) {
154 waddch(dialog, ' ');
155 break;
156 }
157 waddch(dialog, instr[show_x + i]);
158 }
159 wmove(dialog, box_y, box_x);
160 }
161 pos--;
162 }
163 continue;
164 case KEY_RIGHT:
165 if (pos < len) {
166 if (input_x < box_width - 1) {
167 wmove(dialog, box_y, ++input_x + box_x);
168 } else if (input_x == box_width - 1) {
169 show_x++;
170 wmove(dialog, box_y, box_x);
171 for (i = 0; i < box_width; i++) {
172 if (!instr[show_x + i]) {
173 waddch(dialog, ' ');
174 break;
175 }
176 waddch(dialog, instr[show_x + i]);
177 }
178 wmove(dialog, box_y, input_x + box_x);
179 }
180 pos++;
181 }
182 continue;
183 default:
184 if (key < 0x100 && isprint(key)) {
185 if (len < MAX_LEN) {
186 wattrset(dialog, dlg.inputbox.atr);
187 if (pos < len) {
188 for (i = len; i > pos; i--)
189 instr[i] = instr[i-1];
190 instr[pos] = key;
191 } else {
192 instr[len] = key;
193 }
194 pos++;
195 len++;
196 instr[len] = '\0';
197
198 if (input_x == box_width - 1) {
199 show_x++;
200 } else {
201 input_x++;
202 }
203
204 wmove(dialog, box_y, box_x);
205 for (i = 0; i < box_width; i++) {
206 if (!instr[show_x + i]) {
207 waddch(dialog, ' ');
208 break;
209 }
210 waddch(dialog, instr[show_x + i]);
211 }
212 wmove(dialog, box_y, input_x + box_x);
213 wrefresh(dialog);
214 } else
215 flash(); /* Alarm user about overflow */
216 continue;
217 }
218 }
219 }
220 switch (key) {
221 case 'O':
222 case 'o':
223 delwin(dialog);
224 return 0;
225 case 'H':
226 case 'h':
227 delwin(dialog);
228 return 1;
229 case KEY_UP:
230 case KEY_LEFT:
231 switch (button) {
232 case -1:
233 button = 1; /* Indicates "Help" button is selected */
234 print_buttons(dialog, height, width, 1);
235 break;
236 case 0:
237 button = -1; /* Indicates input box is selected */
238 print_buttons(dialog, height, width, 0);
239 wmove(dialog, box_y, box_x + input_x);
240 wrefresh(dialog);
241 break;
242 case 1:
243 button = 0; /* Indicates "OK" button is selected */
244 print_buttons(dialog, height, width, 0);
245 break;
246 }
247 break;
248 case TAB:
249 case KEY_DOWN:
250 case KEY_RIGHT:
251 switch (button) {
252 case -1:
253 button = 0; /* Indicates "OK" button is selected */
254 print_buttons(dialog, height, width, 0);
255 break;
256 case 0:
257 button = 1; /* Indicates "Help" button is selected */
258 print_buttons(dialog, height, width, 1);
259 break;
260 case 1:
261 button = -1; /* Indicates input box is selected */
262 print_buttons(dialog, height, width, 0);
263 wmove(dialog, box_y, box_x + input_x);
264 wrefresh(dialog);
265 break;
266 }
267 break;
268 case ' ':
269 case '\n':
270 delwin(dialog);
271 return (button == -1 ? 0 : button);
272 case 'X':
273 case 'x':
274 key = KEY_ESC;
275 break;
276 case KEY_ESC:
277 key = on_key_esc(dialog);
278 break;
279 case KEY_RESIZE:
280 delwin(dialog);
281 on_key_resize();
282 goto do_resize;
283 }
284 }
285
286 delwin(dialog);
287 return KEY_ESC; /* ESC pressed */
288 }
289