inputbox.c

  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		strncpy(instr, init, 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(stdscr, y, x, height, width);
 58
 59	dialog = newwin(height, width, y, x);
 60	keypad(dialog, TRUE);
 61
 62	draw_box(dialog, 0, 0, height, width,
 63		 dlg.dialog.atr, 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(dialog, prompt, width - 2, 1, 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(dialog, y + 1, box_x - 1, 3, box_width + 2,
 82		 dlg.dialog.atr, dlg.border.atr);
 83
 84	print_buttons(dialog, height, width, 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(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, 1);
238				break;
239			case 0:
240				button = -1;	/* Indicates input box is selected */
241				print_buttons(dialog, height, width, 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, 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, 0);
258				break;
259			case 0:
260				button = 1;	/* Indicates "Help" button is selected */
261				print_buttons(dialog, height, width, 1);
262				break;
263			case 1:
264				button = -1;	/* Indicates input box is selected */
265				print_buttons(dialog, height, width, 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(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}