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1/*
2 * textbox.c -- implements the text box
3 *
4 * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
5 * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version 2
10 * of the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 */
21
22#include "dialog.h"
23
24static void back_lines(int n);
25static void print_page(WINDOW *win, int height, int width, update_text_fn
26 update_text, void *data);
27static void print_line(WINDOW *win, int row, int width);
28static char *get_line(void);
29static void print_position(WINDOW * win);
30
31static int hscroll;
32static int begin_reached, end_reached, page_length;
33static char *buf;
34static char *page;
35
36/*
37 * refresh window content
38 */
39static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
40 int cur_y, int cur_x, update_text_fn update_text,
41 void *data)
42{
43 print_page(box, boxh, boxw, update_text, data);
44 print_position(dialog);
45 wmove(dialog, cur_y, cur_x); /* Restore cursor position */
46 wrefresh(dialog);
47}
48
49
50/*
51 * Display text from a file in a dialog box.
52 *
53 * keys is a null-terminated array
54 * update_text() may not add or remove any '\n' or '\0' in tbuf
55 */
56int dialog_textbox(const char *title, char *tbuf, int initial_height,
57 int initial_width, int *keys, int *_vscroll, int *_hscroll,
58 update_text_fn update_text, void *data)
59{
60 int i, x, y, cur_x, cur_y, key = 0;
61 int height, width, boxh, boxw;
62 WINDOW *dialog, *box;
63 bool done = false;
64
65 begin_reached = 1;
66 end_reached = 0;
67 page_length = 0;
68 hscroll = 0;
69 buf = tbuf;
70 page = buf; /* page is pointer to start of page to be displayed */
71
72 if (_vscroll && *_vscroll) {
73 begin_reached = 0;
74
75 for (i = 0; i < *_vscroll; i++)
76 get_line();
77 }
78 if (_hscroll)
79 hscroll = *_hscroll;
80
81do_resize:
82 getmaxyx(stdscr, height, width);
83 if (height < TEXTBOX_HEIGTH_MIN || width < TEXTBOX_WIDTH_MIN)
84 return -ERRDISPLAYTOOSMALL;
85 if (initial_height != 0)
86 height = initial_height;
87 else
88 if (height > 4)
89 height -= 4;
90 else
91 height = 0;
92 if (initial_width != 0)
93 width = initial_width;
94 else
95 if (width > 5)
96 width -= 5;
97 else
98 width = 0;
99
100 /* center dialog box on screen */
101 x = (getmaxx(stdscr) - width) / 2;
102 y = (getmaxy(stdscr) - height) / 2;
103
104 draw_shadow(stdscr, y, x, height, width);
105
106 dialog = newwin(height, width, y, x);
107 keypad(dialog, TRUE);
108
109 /* Create window for box region, used for scrolling text */
110 boxh = height - 4;
111 boxw = width - 2;
112 box = subwin(dialog, boxh, boxw, y + 1, x + 1);
113 wattrset(box, dlg.dialog.atr);
114 wbkgdset(box, dlg.dialog.atr & A_COLOR);
115
116 keypad(box, TRUE);
117
118 /* register the new window, along with its borders */
119 draw_box(dialog, 0, 0, height, width,
120 dlg.dialog.atr, dlg.border.atr);
121
122 wattrset(dialog, dlg.border.atr);
123 mvwaddch(dialog, height - 3, 0, ACS_LTEE);
124 for (i = 0; i < width - 2; i++)
125 waddch(dialog, ACS_HLINE);
126 wattrset(dialog, dlg.dialog.atr);
127 wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
128 waddch(dialog, ACS_RTEE);
129
130 print_title(dialog, title, width);
131
132 print_button(dialog, gettext(" Exit "), height - 2, width / 2 - 4, TRUE);
133 wnoutrefresh(dialog);
134 getyx(dialog, cur_y, cur_x); /* Save cursor position */
135
136 /* Print first page of text */
137 attr_clear(box, boxh, boxw, dlg.dialog.atr);
138 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text,
139 data);
140
141 while (!done) {
142 key = wgetch(dialog);
143 switch (key) {
144 case 'E': /* Exit */
145 case 'e':
146 case 'X':
147 case 'x':
148 case 'q':
149 case '\n':
150 done = true;
151 break;
152 case 'g': /* First page */
153 case KEY_HOME:
154 if (!begin_reached) {
155 begin_reached = 1;
156 page = buf;
157 refresh_text_box(dialog, box, boxh, boxw,
158 cur_y, cur_x, update_text,
159 data);
160 }
161 break;
162 case 'G': /* Last page */
163 case KEY_END:
164
165 end_reached = 1;
166 /* point to last char in buf */
167 page = buf + strlen(buf);
168 back_lines(boxh);
169 refresh_text_box(dialog, box, boxh, boxw, cur_y,
170 cur_x, update_text, data);
171 break;
172 case 'K': /* Previous line */
173 case 'k':
174 case KEY_UP:
175 if (begin_reached)
176 break;
177
178 back_lines(page_length + 1);
179 refresh_text_box(dialog, box, boxh, boxw, cur_y,
180 cur_x, update_text, data);
181 break;
182 case 'B': /* Previous page */
183 case 'b':
184 case 'u':
185 case KEY_PPAGE:
186 if (begin_reached)
187 break;
188 back_lines(page_length + boxh);
189 refresh_text_box(dialog, box, boxh, boxw, cur_y,
190 cur_x, update_text, data);
191 break;
192 case 'J': /* Next line */
193 case 'j':
194 case KEY_DOWN:
195 if (end_reached)
196 break;
197
198 back_lines(page_length - 1);
199 refresh_text_box(dialog, box, boxh, boxw, cur_y,
200 cur_x, update_text, data);
201 break;
202 case KEY_NPAGE: /* Next page */
203 case ' ':
204 case 'd':
205 if (end_reached)
206 break;
207
208 begin_reached = 0;
209 refresh_text_box(dialog, box, boxh, boxw, cur_y,
210 cur_x, update_text, data);
211 break;
212 case '0': /* Beginning of line */
213 case 'H': /* Scroll left */
214 case 'h':
215 case KEY_LEFT:
216 if (hscroll <= 0)
217 break;
218
219 if (key == '0')
220 hscroll = 0;
221 else
222 hscroll--;
223 /* Reprint current page to scroll horizontally */
224 back_lines(page_length);
225 refresh_text_box(dialog, box, boxh, boxw, cur_y,
226 cur_x, update_text, data);
227 break;
228 case 'L': /* Scroll right */
229 case 'l':
230 case KEY_RIGHT:
231 if (hscroll >= MAX_LEN)
232 break;
233 hscroll++;
234 /* Reprint current page to scroll horizontally */
235 back_lines(page_length);
236 refresh_text_box(dialog, box, boxh, boxw, cur_y,
237 cur_x, update_text, data);
238 break;
239 case KEY_ESC:
240 if (on_key_esc(dialog) == KEY_ESC)
241 done = true;
242 break;
243 case KEY_RESIZE:
244 back_lines(height);
245 delwin(box);
246 delwin(dialog);
247 on_key_resize();
248 goto do_resize;
249 default:
250 for (i = 0; keys[i]; i++) {
251 if (key == keys[i]) {
252 done = true;
253 break;
254 }
255 }
256 }
257 }
258 delwin(box);
259 delwin(dialog);
260 if (_vscroll) {
261 const char *s;
262
263 s = buf;
264 *_vscroll = 0;
265 back_lines(page_length);
266 while (s < page && (s = strchr(s, '\n'))) {
267 (*_vscroll)++;
268 s++;
269 }
270 }
271 if (_hscroll)
272 *_hscroll = hscroll;
273 return key;
274}
275
276/*
277 * Go back 'n' lines in text. Called by dialog_textbox().
278 * 'page' will be updated to point to the desired line in 'buf'.
279 */
280static void back_lines(int n)
281{
282 int i;
283
284 begin_reached = 0;
285 /* Go back 'n' lines */
286 for (i = 0; i < n; i++) {
287 if (*page == '\0') {
288 if (end_reached) {
289 end_reached = 0;
290 continue;
291 }
292 }
293 if (page == buf) {
294 begin_reached = 1;
295 return;
296 }
297 page--;
298 do {
299 if (page == buf) {
300 begin_reached = 1;
301 return;
302 }
303 page--;
304 } while (*page != '\n');
305 page++;
306 }
307}
308
309/*
310 * Print a new page of text.
311 */
312static void print_page(WINDOW *win, int height, int width, update_text_fn
313 update_text, void *data)
314{
315 int i, passed_end = 0;
316
317 if (update_text) {
318 char *end;
319
320 for (i = 0; i < height; i++)
321 get_line();
322 end = page;
323 back_lines(height);
324 update_text(buf, page - buf, end - buf, data);
325 }
326
327 page_length = 0;
328 for (i = 0; i < height; i++) {
329 print_line(win, i, width);
330 if (!passed_end)
331 page_length++;
332 if (end_reached && !passed_end)
333 passed_end = 1;
334 }
335 wnoutrefresh(win);
336}
337
338/*
339 * Print a new line of text.
340 */
341static void print_line(WINDOW * win, int row, int width)
342{
343 char *line;
344
345 line = get_line();
346 line += MIN(strlen(line), hscroll); /* Scroll horizontally */
347 wmove(win, row, 0); /* move cursor to correct line */
348 waddch(win, ' ');
349 waddnstr(win, line, MIN(strlen(line), width - 2));
350
351 /* Clear 'residue' of previous line */
352#if OLD_NCURSES
353 {
354 int x = getcurx(win);
355 int i;
356 for (i = 0; i < width - x; i++)
357 waddch(win, ' ');
358 }
359#else
360 wclrtoeol(win);
361#endif
362}
363
364/*
365 * Return current line of text. Called by dialog_textbox() and print_line().
366 * 'page' should point to start of current line before calling, and will be
367 * updated to point to start of next line.
368 */
369static char *get_line(void)
370{
371 int i = 0;
372 static char line[MAX_LEN + 1];
373
374 end_reached = 0;
375 while (*page != '\n') {
376 if (*page == '\0') {
377 end_reached = 1;
378 break;
379 } else if (i < MAX_LEN)
380 line[i++] = *(page++);
381 else {
382 /* Truncate lines longer than MAX_LEN characters */
383 if (i == MAX_LEN)
384 line[i++] = '\0';
385 page++;
386 }
387 }
388 if (i <= MAX_LEN)
389 line[i] = '\0';
390 if (!end_reached)
391 page++; /* move past '\n' */
392
393 return line;
394}
395
396/*
397 * Print current position
398 */
399static void print_position(WINDOW * win)
400{
401 int percent;
402
403 wattrset(win, dlg.position_indicator.atr);
404 wbkgdset(win, dlg.position_indicator.atr & A_COLOR);
405 percent = (page - buf) * 100 / strlen(buf);
406 wmove(win, getmaxy(win) - 3, getmaxx(win) - 9);
407 wprintw(win, "(%3d%%)", percent);
408}
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * textbox.c -- implements the text 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
11static int hscroll;
12static int begin_reached, end_reached, page_length;
13static const char *buf, *page;
14static size_t start, end;
15
16/*
17 * Go back 'n' lines in text. Called by dialog_textbox().
18 * 'page' will be updated to point to the desired line in 'buf'.
19 */
20static void back_lines(int n)
21{
22 int i;
23
24 begin_reached = 0;
25 /* Go back 'n' lines */
26 for (i = 0; i < n; i++) {
27 if (*page == '\0') {
28 if (end_reached) {
29 end_reached = 0;
30 continue;
31 }
32 }
33 if (page == buf) {
34 begin_reached = 1;
35 return;
36 }
37 page--;
38 do {
39 if (page == buf) {
40 begin_reached = 1;
41 return;
42 }
43 page--;
44 } while (*page != '\n');
45 page++;
46 }
47}
48
49/*
50 * Return current line of text. Called by dialog_textbox() and print_line().
51 * 'page' should point to start of current line before calling, and will be
52 * updated to point to start of next line.
53 */
54static char *get_line(void)
55{
56 int i = 0;
57 static char line[MAX_LEN + 1];
58
59 end_reached = 0;
60 while (*page != '\n') {
61 if (*page == '\0') {
62 end_reached = 1;
63 break;
64 } else if (i < MAX_LEN)
65 line[i++] = *(page++);
66 else {
67 /* Truncate lines longer than MAX_LEN characters */
68 if (i == MAX_LEN)
69 line[i++] = '\0';
70 page++;
71 }
72 }
73 if (i <= MAX_LEN)
74 line[i] = '\0';
75 if (!end_reached)
76 page++; /* move past '\n' */
77
78 return line;
79}
80
81/*
82 * Print a new line of text.
83 */
84static void print_line(WINDOW *win, int row, int width)
85{
86 char *line;
87
88 line = get_line();
89 line += MIN(strlen(line), hscroll); /* Scroll horizontally */
90 wmove(win, row, 0); /* move cursor to correct line */
91 waddch(win, ' ');
92 waddnstr(win, line, MIN(strlen(line), width - 2));
93
94 /* Clear 'residue' of previous line */
95 wclrtoeol(win);
96}
97
98/*
99 * Print a new page of text.
100 */
101static void print_page(WINDOW *win, int height, int width)
102{
103 int i, passed_end = 0;
104
105 page_length = 0;
106 for (i = 0; i < height; i++) {
107 print_line(win, i, width);
108 if (!passed_end)
109 page_length++;
110 if (end_reached && !passed_end)
111 passed_end = 1;
112 }
113 wnoutrefresh(win);
114}
115
116/*
117 * Print current position
118 */
119static void print_position(WINDOW *win)
120{
121 int percent;
122
123 wattrset(win, dlg.position_indicator.atr);
124 wbkgdset(win, dlg.position_indicator.atr & A_COLOR);
125 percent = (page - buf) * 100 / strlen(buf);
126 wmove(win, getmaxy(win) - 3, getmaxx(win) - 9);
127 wprintw(win, "(%3d%%)", percent);
128}
129
130/*
131 * refresh window content
132 */
133static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
134 int cur_y, int cur_x)
135{
136 start = page - buf;
137
138 print_page(box, boxh, boxw);
139 print_position(dialog);
140 wmove(dialog, cur_y, cur_x); /* Restore cursor position */
141 wrefresh(dialog);
142
143 end = page - buf;
144}
145
146/*
147 * Display text from a file in a dialog box.
148 *
149 * keys is a null-terminated array
150 */
151int dialog_textbox(const char *title, const char *tbuf, int initial_height,
152 int initial_width, int *_vscroll, int *_hscroll,
153 int (*extra_key_cb)(int, size_t, size_t, void *), void *data)
154{
155 int i, x, y, cur_x, cur_y, key = 0;
156 int height, width, boxh, boxw;
157 WINDOW *dialog, *box;
158 bool done = false;
159
160 begin_reached = 1;
161 end_reached = 0;
162 page_length = 0;
163 hscroll = 0;
164 buf = tbuf;
165 page = buf; /* page is pointer to start of page to be displayed */
166
167 if (_vscroll && *_vscroll) {
168 begin_reached = 0;
169
170 for (i = 0; i < *_vscroll; i++)
171 get_line();
172 }
173 if (_hscroll)
174 hscroll = *_hscroll;
175
176do_resize:
177 getmaxyx(stdscr, height, width);
178 if (height < TEXTBOX_HEIGHT_MIN || width < TEXTBOX_WIDTH_MIN)
179 return -ERRDISPLAYTOOSMALL;
180 if (initial_height != 0)
181 height = initial_height;
182 else
183 if (height > 4)
184 height -= 4;
185 else
186 height = 0;
187 if (initial_width != 0)
188 width = initial_width;
189 else
190 if (width > 5)
191 width -= 5;
192 else
193 width = 0;
194
195 /* center dialog box on screen */
196 x = (getmaxx(stdscr) - width) / 2;
197 y = (getmaxy(stdscr) - height) / 2;
198
199 draw_shadow(stdscr, y, x, height, width);
200
201 dialog = newwin(height, width, y, x);
202 keypad(dialog, TRUE);
203
204 /* Create window for box region, used for scrolling text */
205 boxh = height - 4;
206 boxw = width - 2;
207 box = subwin(dialog, boxh, boxw, y + 1, x + 1);
208 wattrset(box, dlg.dialog.atr);
209 wbkgdset(box, dlg.dialog.atr & A_COLOR);
210
211 keypad(box, TRUE);
212
213 /* register the new window, along with its borders */
214 draw_box(dialog, 0, 0, height, width,
215 dlg.dialog.atr, dlg.border.atr);
216
217 wattrset(dialog, dlg.border.atr);
218 mvwaddch(dialog, height - 3, 0, ACS_LTEE);
219 for (i = 0; i < width - 2; i++)
220 waddch(dialog, ACS_HLINE);
221 wattrset(dialog, dlg.dialog.atr);
222 wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
223 waddch(dialog, ACS_RTEE);
224
225 print_title(dialog, title, width);
226
227 print_button(dialog, " Exit ", height - 2, width / 2 - 4, TRUE);
228 wnoutrefresh(dialog);
229 getyx(dialog, cur_y, cur_x); /* Save cursor position */
230
231 /* Print first page of text */
232 attr_clear(box, boxh, boxw, dlg.dialog.atr);
233 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
234
235 while (!done) {
236 key = wgetch(dialog);
237 switch (key) {
238 case 'E': /* Exit */
239 case 'e':
240 case 'X':
241 case 'x':
242 case 'q':
243 case '\n':
244 done = true;
245 break;
246 case 'g': /* First page */
247 case KEY_HOME:
248 if (!begin_reached) {
249 begin_reached = 1;
250 page = buf;
251 refresh_text_box(dialog, box, boxh, boxw,
252 cur_y, cur_x);
253 }
254 break;
255 case 'G': /* Last page */
256 case KEY_END:
257
258 end_reached = 1;
259 /* point to last char in buf */
260 page = buf + strlen(buf);
261 back_lines(boxh);
262 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
263 break;
264 case 'K': /* Previous line */
265 case 'k':
266 case KEY_UP:
267 if (begin_reached)
268 break;
269
270 back_lines(page_length + 1);
271 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
272 break;
273 case 'B': /* Previous page */
274 case 'b':
275 case 'u':
276 case KEY_PPAGE:
277 if (begin_reached)
278 break;
279 back_lines(page_length + boxh);
280 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
281 break;
282 case 'J': /* Next line */
283 case 'j':
284 case KEY_DOWN:
285 if (end_reached)
286 break;
287
288 back_lines(page_length - 1);
289 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
290 break;
291 case KEY_NPAGE: /* Next page */
292 case ' ':
293 case 'd':
294 if (end_reached)
295 break;
296
297 begin_reached = 0;
298 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
299 break;
300 case '0': /* Beginning of line */
301 case 'H': /* Scroll left */
302 case 'h':
303 case KEY_LEFT:
304 if (hscroll <= 0)
305 break;
306
307 if (key == '0')
308 hscroll = 0;
309 else
310 hscroll--;
311 /* Reprint current page to scroll horizontally */
312 back_lines(page_length);
313 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
314 break;
315 case 'L': /* Scroll right */
316 case 'l':
317 case KEY_RIGHT:
318 if (hscroll >= MAX_LEN)
319 break;
320 hscroll++;
321 /* Reprint current page to scroll horizontally */
322 back_lines(page_length);
323 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
324 break;
325 case KEY_ESC:
326 if (on_key_esc(dialog) == KEY_ESC)
327 done = true;
328 break;
329 case KEY_RESIZE:
330 back_lines(height);
331 delwin(box);
332 delwin(dialog);
333 on_key_resize();
334 goto do_resize;
335 default:
336 if (extra_key_cb && extra_key_cb(key, start, end, data)) {
337 done = true;
338 break;
339 }
340 }
341 }
342 delwin(box);
343 delwin(dialog);
344 if (_vscroll) {
345 const char *s;
346
347 s = buf;
348 *_vscroll = 0;
349 back_lines(page_length);
350 while (s < page && (s = strchr(s, '\n'))) {
351 (*_vscroll)++;
352 s++;
353 }
354 }
355 if (_hscroll)
356 *_hscroll = hscroll;
357 return key;
358}