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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 void back_lines(int n);
12static void print_page(WINDOW *win, int height, int width, update_text_fn
13 update_text, void *data);
14static void print_line(WINDOW *win, int row, int width);
15static char *get_line(void);
16static void print_position(WINDOW * win);
17
18static int hscroll;
19static int begin_reached, end_reached, page_length;
20static char *buf;
21static char *page;
22
23/*
24 * refresh window content
25 */
26static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
27 int cur_y, int cur_x, update_text_fn update_text,
28 void *data)
29{
30 print_page(box, boxh, boxw, update_text, data);
31 print_position(dialog);
32 wmove(dialog, cur_y, cur_x); /* Restore cursor position */
33 wrefresh(dialog);
34}
35
36
37/*
38 * Display text from a file in a dialog box.
39 *
40 * keys is a null-terminated array
41 * update_text() may not add or remove any '\n' or '\0' in tbuf
42 */
43int dialog_textbox(const char *title, char *tbuf, int initial_height,
44 int initial_width, int *keys, int *_vscroll, int *_hscroll,
45 update_text_fn update_text, void *data)
46{
47 int i, x, y, cur_x, cur_y, key = 0;
48 int height, width, boxh, boxw;
49 WINDOW *dialog, *box;
50 bool done = false;
51
52 begin_reached = 1;
53 end_reached = 0;
54 page_length = 0;
55 hscroll = 0;
56 buf = tbuf;
57 page = buf; /* page is pointer to start of page to be displayed */
58
59 if (_vscroll && *_vscroll) {
60 begin_reached = 0;
61
62 for (i = 0; i < *_vscroll; i++)
63 get_line();
64 }
65 if (_hscroll)
66 hscroll = *_hscroll;
67
68do_resize:
69 getmaxyx(stdscr, height, width);
70 if (height < TEXTBOX_HEIGTH_MIN || width < TEXTBOX_WIDTH_MIN)
71 return -ERRDISPLAYTOOSMALL;
72 if (initial_height != 0)
73 height = initial_height;
74 else
75 if (height > 4)
76 height -= 4;
77 else
78 height = 0;
79 if (initial_width != 0)
80 width = initial_width;
81 else
82 if (width > 5)
83 width -= 5;
84 else
85 width = 0;
86
87 /* center dialog box on screen */
88 x = (getmaxx(stdscr) - width) / 2;
89 y = (getmaxy(stdscr) - height) / 2;
90
91 draw_shadow(stdscr, y, x, height, width);
92
93 dialog = newwin(height, width, y, x);
94 keypad(dialog, TRUE);
95
96 /* Create window for box region, used for scrolling text */
97 boxh = height - 4;
98 boxw = width - 2;
99 box = subwin(dialog, boxh, boxw, y + 1, x + 1);
100 wattrset(box, dlg.dialog.atr);
101 wbkgdset(box, dlg.dialog.atr & A_COLOR);
102
103 keypad(box, TRUE);
104
105 /* register the new window, along with its borders */
106 draw_box(dialog, 0, 0, height, width,
107 dlg.dialog.atr, dlg.border.atr);
108
109 wattrset(dialog, dlg.border.atr);
110 mvwaddch(dialog, height - 3, 0, ACS_LTEE);
111 for (i = 0; i < width - 2; i++)
112 waddch(dialog, ACS_HLINE);
113 wattrset(dialog, dlg.dialog.atr);
114 wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
115 waddch(dialog, ACS_RTEE);
116
117 print_title(dialog, title, width);
118
119 print_button(dialog, " Exit ", height - 2, width / 2 - 4, TRUE);
120 wnoutrefresh(dialog);
121 getyx(dialog, cur_y, cur_x); /* Save cursor position */
122
123 /* Print first page of text */
124 attr_clear(box, boxh, boxw, dlg.dialog.atr);
125 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text,
126 data);
127
128 while (!done) {
129 key = wgetch(dialog);
130 switch (key) {
131 case 'E': /* Exit */
132 case 'e':
133 case 'X':
134 case 'x':
135 case 'q':
136 case '\n':
137 done = true;
138 break;
139 case 'g': /* First page */
140 case KEY_HOME:
141 if (!begin_reached) {
142 begin_reached = 1;
143 page = buf;
144 refresh_text_box(dialog, box, boxh, boxw,
145 cur_y, cur_x, update_text,
146 data);
147 }
148 break;
149 case 'G': /* Last page */
150 case KEY_END:
151
152 end_reached = 1;
153 /* point to last char in buf */
154 page = buf + strlen(buf);
155 back_lines(boxh);
156 refresh_text_box(dialog, box, boxh, boxw, cur_y,
157 cur_x, update_text, data);
158 break;
159 case 'K': /* Previous line */
160 case 'k':
161 case KEY_UP:
162 if (begin_reached)
163 break;
164
165 back_lines(page_length + 1);
166 refresh_text_box(dialog, box, boxh, boxw, cur_y,
167 cur_x, update_text, data);
168 break;
169 case 'B': /* Previous page */
170 case 'b':
171 case 'u':
172 case KEY_PPAGE:
173 if (begin_reached)
174 break;
175 back_lines(page_length + boxh);
176 refresh_text_box(dialog, box, boxh, boxw, cur_y,
177 cur_x, update_text, data);
178 break;
179 case 'J': /* Next line */
180 case 'j':
181 case KEY_DOWN:
182 if (end_reached)
183 break;
184
185 back_lines(page_length - 1);
186 refresh_text_box(dialog, box, boxh, boxw, cur_y,
187 cur_x, update_text, data);
188 break;
189 case KEY_NPAGE: /* Next page */
190 case ' ':
191 case 'd':
192 if (end_reached)
193 break;
194
195 begin_reached = 0;
196 refresh_text_box(dialog, box, boxh, boxw, cur_y,
197 cur_x, update_text, data);
198 break;
199 case '0': /* Beginning of line */
200 case 'H': /* Scroll left */
201 case 'h':
202 case KEY_LEFT:
203 if (hscroll <= 0)
204 break;
205
206 if (key == '0')
207 hscroll = 0;
208 else
209 hscroll--;
210 /* Reprint current page to scroll horizontally */
211 back_lines(page_length);
212 refresh_text_box(dialog, box, boxh, boxw, cur_y,
213 cur_x, update_text, data);
214 break;
215 case 'L': /* Scroll right */
216 case 'l':
217 case KEY_RIGHT:
218 if (hscroll >= MAX_LEN)
219 break;
220 hscroll++;
221 /* Reprint current page to scroll horizontally */
222 back_lines(page_length);
223 refresh_text_box(dialog, box, boxh, boxw, cur_y,
224 cur_x, update_text, data);
225 break;
226 case KEY_ESC:
227 if (on_key_esc(dialog) == KEY_ESC)
228 done = true;
229 break;
230 case KEY_RESIZE:
231 back_lines(height);
232 delwin(box);
233 delwin(dialog);
234 on_key_resize();
235 goto do_resize;
236 default:
237 for (i = 0; keys[i]; i++) {
238 if (key == keys[i]) {
239 done = true;
240 break;
241 }
242 }
243 }
244 }
245 delwin(box);
246 delwin(dialog);
247 if (_vscroll) {
248 const char *s;
249
250 s = buf;
251 *_vscroll = 0;
252 back_lines(page_length);
253 while (s < page && (s = strchr(s, '\n'))) {
254 (*_vscroll)++;
255 s++;
256 }
257 }
258 if (_hscroll)
259 *_hscroll = hscroll;
260 return key;
261}
262
263/*
264 * Go back 'n' lines in text. Called by dialog_textbox().
265 * 'page' will be updated to point to the desired line in 'buf'.
266 */
267static void back_lines(int n)
268{
269 int i;
270
271 begin_reached = 0;
272 /* Go back 'n' lines */
273 for (i = 0; i < n; i++) {
274 if (*page == '\0') {
275 if (end_reached) {
276 end_reached = 0;
277 continue;
278 }
279 }
280 if (page == buf) {
281 begin_reached = 1;
282 return;
283 }
284 page--;
285 do {
286 if (page == buf) {
287 begin_reached = 1;
288 return;
289 }
290 page--;
291 } while (*page != '\n');
292 page++;
293 }
294}
295
296/*
297 * Print a new page of text.
298 */
299static void print_page(WINDOW *win, int height, int width, update_text_fn
300 update_text, void *data)
301{
302 int i, passed_end = 0;
303
304 if (update_text) {
305 char *end;
306
307 for (i = 0; i < height; i++)
308 get_line();
309 end = page;
310 back_lines(height);
311 update_text(buf, page - buf, end - buf, data);
312 }
313
314 page_length = 0;
315 for (i = 0; i < height; i++) {
316 print_line(win, i, width);
317 if (!passed_end)
318 page_length++;
319 if (end_reached && !passed_end)
320 passed_end = 1;
321 }
322 wnoutrefresh(win);
323}
324
325/*
326 * Print a new line of text.
327 */
328static void print_line(WINDOW * win, int row, int width)
329{
330 char *line;
331
332 line = get_line();
333 line += MIN(strlen(line), hscroll); /* Scroll horizontally */
334 wmove(win, row, 0); /* move cursor to correct line */
335 waddch(win, ' ');
336 waddnstr(win, line, MIN(strlen(line), width - 2));
337
338 /* Clear 'residue' of previous line */
339#if OLD_NCURSES
340 {
341 int x = getcurx(win);
342 int i;
343 for (i = 0; i < width - x; i++)
344 waddch(win, ' ');
345 }
346#else
347 wclrtoeol(win);
348#endif
349}
350
351/*
352 * Return current line of text. Called by dialog_textbox() and print_line().
353 * 'page' should point to start of current line before calling, and will be
354 * updated to point to start of next line.
355 */
356static char *get_line(void)
357{
358 int i = 0;
359 static char line[MAX_LEN + 1];
360
361 end_reached = 0;
362 while (*page != '\n') {
363 if (*page == '\0') {
364 end_reached = 1;
365 break;
366 } else if (i < MAX_LEN)
367 line[i++] = *(page++);
368 else {
369 /* Truncate lines longer than MAX_LEN characters */
370 if (i == MAX_LEN)
371 line[i++] = '\0';
372 page++;
373 }
374 }
375 if (i <= MAX_LEN)
376 line[i] = '\0';
377 if (!end_reached)
378 page++; /* move past '\n' */
379
380 return line;
381}
382
383/*
384 * Print current position
385 */
386static void print_position(WINDOW * win)
387{
388 int percent;
389
390 wattrset(win, dlg.position_indicator.atr);
391 wbkgdset(win, dlg.position_indicator.atr & A_COLOR);
392 percent = (page - buf) * 100 / strlen(buf);
393 wmove(win, getmaxy(win) - 3, getmaxx(win) - 9);
394 wprintw(win, "(%3d%%)", percent);
395}