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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);
26static void print_line(WINDOW * win, int row, int width);
27static char *get_line(void);
28static void print_position(WINDOW * win);
29
30static int hscroll;
31static int begin_reached, end_reached, page_length;
32static const char *buf;
33static const char *page;
34
35/*
36 * refresh window content
37 */
38static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
39 int cur_y, int cur_x)
40{
41 print_page(box, boxh, boxw);
42 print_position(dialog);
43 wmove(dialog, cur_y, cur_x); /* Restore cursor position */
44 wrefresh(dialog);
45}
46
47
48/*
49 * Display text from a file in a dialog box.
50 */
51int dialog_textbox(const char *title, const char *tbuf,
52 int initial_height, int initial_width)
53{
54 int i, x, y, cur_x, cur_y, key = 0;
55 int height, width, boxh, boxw;
56 int passed_end;
57 WINDOW *dialog, *box;
58
59 begin_reached = 1;
60 end_reached = 0;
61 page_length = 0;
62 hscroll = 0;
63 buf = tbuf;
64 page = buf; /* page is pointer to start of page to be displayed */
65
66do_resize:
67 getmaxyx(stdscr, height, width);
68 if (height < 8 || width < 8)
69 return -ERRDISPLAYTOOSMALL;
70 if (initial_height != 0)
71 height = initial_height;
72 else
73 if (height > 4)
74 height -= 4;
75 else
76 height = 0;
77 if (initial_width != 0)
78 width = initial_width;
79 else
80 if (width > 5)
81 width -= 5;
82 else
83 width = 0;
84
85 /* center dialog box on screen */
86 x = (COLS - width) / 2;
87 y = (LINES - height) / 2;
88
89 draw_shadow(stdscr, y, x, height, width);
90
91 dialog = newwin(height, width, y, x);
92 keypad(dialog, TRUE);
93
94 /* Create window for box region, used for scrolling text */
95 boxh = height - 4;
96 boxw = width - 2;
97 box = subwin(dialog, boxh, boxw, y + 1, x + 1);
98 wattrset(box, dlg.dialog.atr);
99 wbkgdset(box, dlg.dialog.atr & A_COLOR);
100
101 keypad(box, TRUE);
102
103 /* register the new window, along with its borders */
104 draw_box(dialog, 0, 0, height, width,
105 dlg.dialog.atr, dlg.border.atr);
106
107 wattrset(dialog, dlg.border.atr);
108 mvwaddch(dialog, height - 3, 0, ACS_LTEE);
109 for (i = 0; i < width - 2; i++)
110 waddch(dialog, ACS_HLINE);
111 wattrset(dialog, dlg.dialog.atr);
112 wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
113 waddch(dialog, ACS_RTEE);
114
115 print_title(dialog, title, width);
116
117 print_button(dialog, gettext(" Exit "), height - 2, width / 2 - 4, TRUE);
118 wnoutrefresh(dialog);
119 getyx(dialog, cur_y, cur_x); /* Save cursor position */
120
121 /* Print first page of text */
122 attr_clear(box, boxh, boxw, dlg.dialog.atr);
123 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
124
125 while ((key != KEY_ESC) && (key != '\n')) {
126 key = wgetch(dialog);
127 switch (key) {
128 case 'E': /* Exit */
129 case 'e':
130 case 'X':
131 case 'x':
132 delwin(box);
133 delwin(dialog);
134 return 0;
135 case 'g': /* First page */
136 case KEY_HOME:
137 if (!begin_reached) {
138 begin_reached = 1;
139 page = buf;
140 refresh_text_box(dialog, box, boxh, boxw,
141 cur_y, cur_x);
142 }
143 break;
144 case 'G': /* Last page */
145 case KEY_END:
146
147 end_reached = 1;
148 /* point to last char in buf */
149 page = buf + strlen(buf);
150 back_lines(boxh);
151 refresh_text_box(dialog, box, boxh, boxw,
152 cur_y, cur_x);
153 break;
154 case 'K': /* Previous line */
155 case 'k':
156 case KEY_UP:
157 if (!begin_reached) {
158 back_lines(page_length + 1);
159
160 /* We don't call print_page() here but use
161 * scrolling to ensure faster screen update.
162 * However, 'end_reached' and 'page_length'
163 * should still be updated, and 'page' should
164 * point to start of next page. This is done
165 * by calling get_line() in the following
166 * 'for' loop. */
167 scrollok(box, TRUE);
168 wscrl(box, -1); /* Scroll box region down one line */
169 scrollok(box, FALSE);
170 page_length = 0;
171 passed_end = 0;
172 for (i = 0; i < boxh; i++) {
173 if (!i) {
174 /* print first line of page */
175 print_line(box, 0, boxw);
176 wnoutrefresh(box);
177 } else
178 /* Called to update 'end_reached' and 'page' */
179 get_line();
180 if (!passed_end)
181 page_length++;
182 if (end_reached && !passed_end)
183 passed_end = 1;
184 }
185
186 print_position(dialog);
187 wmove(dialog, cur_y, cur_x); /* Restore cursor position */
188 wrefresh(dialog);
189 }
190 break;
191 case 'B': /* Previous page */
192 case 'b':
193 case KEY_PPAGE:
194 if (begin_reached)
195 break;
196 back_lines(page_length + boxh);
197 refresh_text_box(dialog, box, boxh, boxw,
198 cur_y, cur_x);
199 break;
200 case 'J': /* Next line */
201 case 'j':
202 case KEY_DOWN:
203 if (!end_reached) {
204 begin_reached = 0;
205 scrollok(box, TRUE);
206 scroll(box); /* Scroll box region up one line */
207 scrollok(box, FALSE);
208 print_line(box, boxh - 1, boxw);
209 wnoutrefresh(box);
210 print_position(dialog);
211 wmove(dialog, cur_y, cur_x); /* Restore cursor position */
212 wrefresh(dialog);
213 }
214 break;
215 case KEY_NPAGE: /* Next page */
216 case ' ':
217 if (end_reached)
218 break;
219
220 begin_reached = 0;
221 refresh_text_box(dialog, box, boxh, boxw,
222 cur_y, cur_x);
223 break;
224 case '0': /* Beginning of line */
225 case 'H': /* Scroll left */
226 case 'h':
227 case KEY_LEFT:
228 if (hscroll <= 0)
229 break;
230
231 if (key == '0')
232 hscroll = 0;
233 else
234 hscroll--;
235 /* Reprint current page to scroll horizontally */
236 back_lines(page_length);
237 refresh_text_box(dialog, box, boxh, boxw,
238 cur_y, cur_x);
239 break;
240 case 'L': /* Scroll right */
241 case 'l':
242 case KEY_RIGHT:
243 if (hscroll >= MAX_LEN)
244 break;
245 hscroll++;
246 /* Reprint current page to scroll horizontally */
247 back_lines(page_length);
248 refresh_text_box(dialog, box, boxh, boxw,
249 cur_y, cur_x);
250 break;
251 case KEY_ESC:
252 key = on_key_esc(dialog);
253 break;
254 case KEY_RESIZE:
255 back_lines(height);
256 delwin(box);
257 delwin(dialog);
258 on_key_resize();
259 goto do_resize;
260 }
261 }
262 delwin(box);
263 delwin(dialog);
264 return key; /* ESC pressed */
265}
266
267/*
268 * Go back 'n' lines in text. Called by dialog_textbox().
269 * 'page' will be updated to point to the desired line in 'buf'.
270 */
271static void back_lines(int n)
272{
273 int i;
274
275 begin_reached = 0;
276 /* Go back 'n' lines */
277 for (i = 0; i < n; i++) {
278 if (*page == '\0') {
279 if (end_reached) {
280 end_reached = 0;
281 continue;
282 }
283 }
284 if (page == buf) {
285 begin_reached = 1;
286 return;
287 }
288 page--;
289 do {
290 if (page == buf) {
291 begin_reached = 1;
292 return;
293 }
294 page--;
295 } while (*page != '\n');
296 page++;
297 }
298}
299
300/*
301 * Print a new page of text. Called by dialog_textbox().
302 */
303static void print_page(WINDOW * win, int height, int width)
304{
305 int i, passed_end = 0;
306
307 page_length = 0;
308 for (i = 0; i < height; i++) {
309 print_line(win, i, width);
310 if (!passed_end)
311 page_length++;
312 if (end_reached && !passed_end)
313 passed_end = 1;
314 }
315 wnoutrefresh(win);
316}
317
318/*
319 * Print a new line of text. Called by dialog_textbox() and print_page().
320 */
321static void print_line(WINDOW * win, int row, int width)
322{
323 int y, x;
324 char *line;
325
326 line = get_line();
327 line += MIN(strlen(line), hscroll); /* Scroll horizontally */
328 wmove(win, row, 0); /* move cursor to correct line */
329 waddch(win, ' ');
330 waddnstr(win, line, MIN(strlen(line), width - 2));
331
332 getyx(win, y, x);
333 /* Clear 'residue' of previous line */
334#if OLD_NCURSES
335 {
336 int i;
337 for (i = 0; i < width - x; i++)
338 waddch(win, ' ');
339 }
340#else
341 wclrtoeol(win);
342#endif
343}
344
345/*
346 * Return current line of text. Called by dialog_textbox() and print_line().
347 * 'page' should point to start of current line before calling, and will be
348 * updated to point to start of next line.
349 */
350static char *get_line(void)
351{
352 int i = 0;
353 static char line[MAX_LEN + 1];
354
355 end_reached = 0;
356 while (*page != '\n') {
357 if (*page == '\0') {
358 if (!end_reached) {
359 end_reached = 1;
360 break;
361 }
362 } else if (i < MAX_LEN)
363 line[i++] = *(page++);
364 else {
365 /* Truncate lines longer than MAX_LEN characters */
366 if (i == MAX_LEN)
367 line[i++] = '\0';
368 page++;
369 }
370 }
371 if (i <= MAX_LEN)
372 line[i] = '\0';
373 if (!end_reached)
374 page++; /* move pass '\n' */
375
376 return line;
377}
378
379/*
380 * Print current position
381 */
382static void print_position(WINDOW * win)
383{
384 int percent;
385
386 wattrset(win, dlg.position_indicator.atr);
387 wbkgdset(win, dlg.position_indicator.atr & A_COLOR);
388 percent = (page - buf) * 100 / strlen(buf);
389 wmove(win, getmaxy(win) - 3, getmaxx(win) - 9);
390 wprintw(win, "(%3d%%)", percent);
391}
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}