Commit | Line | Data |
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1da177e4 LT |
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 | ||
b1c5f1c6 SR |
24 | static void back_lines(int n); |
25 | static void print_page(WINDOW * win, int height, int width); | |
26 | static void print_line(WINDOW * win, int row, int width); | |
27 | static char *get_line(void); | |
28 | static void print_position(WINDOW * win, int height, int width); | |
1da177e4 LT |
29 | |
30 | static int hscroll, fd, file_size, bytes_read; | |
31 | static int begin_reached = 1, end_reached, page_length; | |
32 | static char *buf, *page; | |
33 | ||
34 | /* | |
35 | * Display text from a file in a dialog box. | |
36 | */ | |
b1c5f1c6 | 37 | int dialog_textbox(const char *title, const char *file, int height, int width) |
1da177e4 | 38 | { |
b1c5f1c6 SR |
39 | int i, x, y, cur_x, cur_y, fpos, key = 0; |
40 | int passed_end; | |
41 | char search_term[MAX_LEN + 1]; | |
42 | WINDOW *dialog, *text; | |
43 | ||
44 | search_term[0] = '\0'; /* no search term entered yet */ | |
45 | ||
46 | /* Open input file for reading */ | |
47 | if ((fd = open(file, O_RDONLY)) == -1) { | |
48 | endwin(); | |
dec69da8 | 49 | fprintf(stderr, "\nCan't open input file in dialog_textbox().\n"); |
b1c5f1c6 SR |
50 | exit(-1); |
51 | } | |
52 | /* Get file size. Actually, 'file_size' is the real file size - 1, | |
53 | since it's only the last byte offset from the beginning */ | |
54 | if ((file_size = lseek(fd, 0, SEEK_END)) == -1) { | |
55 | endwin(); | |
dec69da8 | 56 | fprintf(stderr, "\nError getting file size in dialog_textbox().\n"); |
b1c5f1c6 SR |
57 | exit(-1); |
58 | } | |
59 | /* Restore file pointer to beginning of file after getting file size */ | |
60 | if (lseek(fd, 0, SEEK_SET) == -1) { | |
61 | endwin(); | |
dec69da8 | 62 | fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n"); |
b1c5f1c6 SR |
63 | exit(-1); |
64 | } | |
65 | /* Allocate space for read buffer */ | |
66 | if ((buf = malloc(BUF_SIZE + 1)) == NULL) { | |
67 | endwin(); | |
dec69da8 | 68 | fprintf(stderr, "\nCan't allocate memory in dialog_textbox().\n"); |
b1c5f1c6 SR |
69 | exit(-1); |
70 | } | |
71 | if ((bytes_read = read(fd, buf, BUF_SIZE)) == -1) { | |
72 | endwin(); | |
73 | fprintf(stderr, "\nError reading file in dialog_textbox().\n"); | |
74 | exit(-1); | |
75 | } | |
76 | buf[bytes_read] = '\0'; /* mark end of valid data */ | |
77 | page = buf; /* page is pointer to start of page to be displayed */ | |
78 | ||
79 | /* center dialog box on screen */ | |
80 | x = (COLS - width) / 2; | |
81 | y = (LINES - height) / 2; | |
82 | ||
83 | draw_shadow(stdscr, y, x, height, width); | |
84 | ||
85 | dialog = newwin(height, width, y, x); | |
86 | keypad(dialog, TRUE); | |
87 | ||
88 | /* Create window for text region, used for scrolling text */ | |
89 | text = subwin(dialog, height - 4, width - 2, y + 1, x + 1); | |
90 | wattrset(text, dialog_attr); | |
91 | wbkgdset(text, dialog_attr & A_COLOR); | |
92 | ||
93 | keypad(text, TRUE); | |
94 | ||
95 | /* register the new window, along with its borders */ | |
96 | draw_box(dialog, 0, 0, height, width, dialog_attr, border_attr); | |
97 | ||
98 | wattrset(dialog, border_attr); | |
99 | mvwaddch(dialog, height - 3, 0, ACS_LTEE); | |
100 | for (i = 0; i < width - 2; i++) | |
101 | waddch(dialog, ACS_HLINE); | |
102 | wattrset(dialog, dialog_attr); | |
103 | wbkgdset(dialog, dialog_attr & A_COLOR); | |
104 | waddch(dialog, ACS_RTEE); | |
105 | ||
fa7009d5 | 106 | print_title(dialog, title, width); |
1da177e4 | 107 | |
b1c5f1c6 SR |
108 | print_button(dialog, " Exit ", height - 2, width / 2 - 4, TRUE); |
109 | wnoutrefresh(dialog); | |
110 | getyx(dialog, cur_y, cur_x); /* Save cursor position */ | |
111 | ||
112 | /* Print first page of text */ | |
113 | attr_clear(text, height - 4, width - 2, dialog_attr); | |
114 | print_page(text, height - 4, width - 2); | |
115 | print_position(dialog, height, width); | |
116 | wmove(dialog, cur_y, cur_x); /* Restore cursor position */ | |
117 | wrefresh(dialog); | |
118 | ||
119 | while ((key != ESC) && (key != '\n')) { | |
120 | key = wgetch(dialog); | |
121 | switch (key) { | |
122 | case 'E': /* Exit */ | |
123 | case 'e': | |
124 | case 'X': | |
125 | case 'x': | |
126 | delwin(dialog); | |
127 | free(buf); | |
128 | close(fd); | |
129 | return 0; | |
130 | case 'g': /* First page */ | |
131 | case KEY_HOME: | |
132 | if (!begin_reached) { | |
133 | begin_reached = 1; | |
134 | /* First page not in buffer? */ | |
135 | if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) { | |
136 | endwin(); | |
dec69da8 | 137 | fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n"); |
b1c5f1c6 SR |
138 | exit(-1); |
139 | } | |
140 | if (fpos > bytes_read) { /* Yes, we have to read it in */ | |
141 | if (lseek(fd, 0, SEEK_SET) == -1) { | |
142 | endwin(); | |
dec69da8 SR |
143 | fprintf(stderr, "\nError moving file pointer in " |
144 | "dialog_textbox().\n"); | |
b1c5f1c6 SR |
145 | exit(-1); |
146 | } | |
147 | if ((bytes_read = | |
148 | read(fd, buf, BUF_SIZE)) == -1) { | |
149 | endwin(); | |
dec69da8 | 150 | fprintf(stderr, "\nError reading file in dialog_textbox().\n"); |
b1c5f1c6 SR |
151 | exit(-1); |
152 | } | |
153 | buf[bytes_read] = '\0'; | |
154 | } | |
155 | page = buf; | |
156 | print_page(text, height - 4, width - 2); | |
157 | print_position(dialog, height, width); | |
158 | wmove(dialog, cur_y, cur_x); /* Restore cursor position */ | |
159 | wrefresh(dialog); | |
160 | } | |
161 | break; | |
162 | case 'G': /* Last page */ | |
163 | case KEY_END: | |
164 | ||
165 | end_reached = 1; | |
166 | /* Last page not in buffer? */ | |
167 | if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) { | |
168 | endwin(); | |
dec69da8 | 169 | fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n"); |
b1c5f1c6 SR |
170 | exit(-1); |
171 | } | |
172 | if (fpos < file_size) { /* Yes, we have to read it in */ | |
173 | if (lseek(fd, -BUF_SIZE, SEEK_END) == -1) { | |
174 | endwin(); | |
dec69da8 | 175 | fprintf(stderr, "\nError moving file pointer in dialog_textbox().\n"); |
b1c5f1c6 SR |
176 | exit(-1); |
177 | } | |
178 | if ((bytes_read = | |
179 | read(fd, buf, BUF_SIZE)) == -1) { | |
180 | endwin(); | |
dec69da8 | 181 | fprintf(stderr, "\nError reading file in dialog_textbox().\n"); |
b1c5f1c6 SR |
182 | exit(-1); |
183 | } | |
184 | buf[bytes_read] = '\0'; | |
185 | } | |
186 | page = buf + bytes_read; | |
187 | back_lines(height - 4); | |
188 | print_page(text, height - 4, width - 2); | |
189 | print_position(dialog, height, width); | |
190 | wmove(dialog, cur_y, cur_x); /* Restore cursor position */ | |
191 | wrefresh(dialog); | |
192 | break; | |
193 | case 'K': /* Previous line */ | |
194 | case 'k': | |
195 | case KEY_UP: | |
196 | if (!begin_reached) { | |
197 | back_lines(page_length + 1); | |
198 | ||
199 | /* We don't call print_page() here but use scrolling to ensure | |
200 | faster screen update. However, 'end_reached' and | |
201 | 'page_length' should still be updated, and 'page' should | |
202 | point to start of next page. This is done by calling | |
203 | get_line() in the following 'for' loop. */ | |
204 | scrollok(text, TRUE); | |
205 | wscrl(text, -1); /* Scroll text region down one line */ | |
206 | scrollok(text, FALSE); | |
207 | page_length = 0; | |
208 | passed_end = 0; | |
209 | for (i = 0; i < height - 4; i++) { | |
210 | if (!i) { | |
211 | /* print first line of page */ | |
212 | print_line(text, 0, width - 2); | |
213 | wnoutrefresh(text); | |
214 | } else | |
215 | /* Called to update 'end_reached' and 'page' */ | |
216 | get_line(); | |
217 | if (!passed_end) | |
218 | page_length++; | |
219 | if (end_reached && !passed_end) | |
220 | passed_end = 1; | |
221 | } | |
222 | ||
223 | print_position(dialog, height, width); | |
224 | wmove(dialog, cur_y, cur_x); /* Restore cursor position */ | |
225 | wrefresh(dialog); | |
226 | } | |
227 | break; | |
228 | case 'B': /* Previous page */ | |
229 | case 'b': | |
230 | case KEY_PPAGE: | |
231 | if (begin_reached) | |
232 | break; | |
233 | back_lines(page_length + height - 4); | |
234 | print_page(text, height - 4, width - 2); | |
235 | print_position(dialog, height, width); | |
236 | wmove(dialog, cur_y, cur_x); | |
237 | wrefresh(dialog); | |
238 | break; | |
239 | case 'J': /* Next line */ | |
240 | case 'j': | |
241 | case KEY_DOWN: | |
242 | if (!end_reached) { | |
243 | begin_reached = 0; | |
244 | scrollok(text, TRUE); | |
245 | scroll(text); /* Scroll text region up one line */ | |
246 | scrollok(text, FALSE); | |
247 | print_line(text, height - 5, width - 2); | |
248 | wnoutrefresh(text); | |
249 | print_position(dialog, height, width); | |
250 | wmove(dialog, cur_y, cur_x); /* Restore cursor position */ | |
251 | wrefresh(dialog); | |
252 | } | |
253 | break; | |
254 | case KEY_NPAGE: /* Next page */ | |
255 | case ' ': | |
256 | if (end_reached) | |
257 | break; | |
258 | ||
259 | begin_reached = 0; | |
260 | print_page(text, height - 4, width - 2); | |
261 | print_position(dialog, height, width); | |
262 | wmove(dialog, cur_y, cur_x); | |
263 | wrefresh(dialog); | |
264 | break; | |
265 | case '0': /* Beginning of line */ | |
266 | case 'H': /* Scroll left */ | |
267 | case 'h': | |
268 | case KEY_LEFT: | |
269 | if (hscroll <= 0) | |
270 | break; | |
271 | ||
272 | if (key == '0') | |
273 | hscroll = 0; | |
274 | else | |
275 | hscroll--; | |
276 | /* Reprint current page to scroll horizontally */ | |
277 | back_lines(page_length); | |
278 | print_page(text, height - 4, width - 2); | |
279 | wmove(dialog, cur_y, cur_x); | |
280 | wrefresh(dialog); | |
281 | break; | |
282 | case 'L': /* Scroll right */ | |
283 | case 'l': | |
284 | case KEY_RIGHT: | |
285 | if (hscroll >= MAX_LEN) | |
286 | break; | |
287 | hscroll++; | |
288 | /* Reprint current page to scroll horizontally */ | |
289 | back_lines(page_length); | |
290 | print_page(text, height - 4, width - 2); | |
291 | wmove(dialog, cur_y, cur_x); | |
292 | wrefresh(dialog); | |
293 | break; | |
294 | case ESC: | |
295 | break; | |
296 | } | |
1da177e4 | 297 | } |
1da177e4 | 298 | |
b1c5f1c6 SR |
299 | delwin(dialog); |
300 | free(buf); | |
301 | close(fd); | |
302 | return -1; /* ESC pressed */ | |
1da177e4 LT |
303 | } |
304 | ||
305 | /* | |
306 | * Go back 'n' lines in text file. Called by dialog_textbox(). | |
307 | * 'page' will be updated to point to the desired line in 'buf'. | |
308 | */ | |
b1c5f1c6 | 309 | static void back_lines(int n) |
1da177e4 | 310 | { |
b1c5f1c6 SR |
311 | int i, fpos; |
312 | ||
313 | begin_reached = 0; | |
314 | /* We have to distinguish between end_reached and !end_reached | |
315 | since at end of file, the line is not ended by a '\n'. | |
316 | The code inside 'if' basically does a '--page' to move one | |
317 | character backward so as to skip '\n' of the previous line */ | |
318 | if (!end_reached) { | |
319 | /* Either beginning of buffer or beginning of file reached? */ | |
320 | if (page == buf) { | |
321 | if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) { | |
322 | endwin(); | |
dec69da8 SR |
323 | fprintf(stderr, "\nError moving file pointer in " |
324 | "back_lines().\n"); | |
b1c5f1c6 SR |
325 | exit(-1); |
326 | } | |
327 | if (fpos > bytes_read) { /* Not beginning of file yet */ | |
328 | /* We've reached beginning of buffer, but not beginning of | |
329 | file yet, so read previous part of file into buffer. | |
330 | Note that we only move backward for BUF_SIZE/2 bytes, | |
331 | but not BUF_SIZE bytes to avoid re-reading again in | |
332 | print_page() later */ | |
333 | /* Really possible to move backward BUF_SIZE/2 bytes? */ | |
334 | if (fpos < BUF_SIZE / 2 + bytes_read) { | |
335 | /* No, move less then */ | |
336 | if (lseek(fd, 0, SEEK_SET) == -1) { | |
337 | endwin(); | |
dec69da8 SR |
338 | fprintf(stderr, "\nError moving file pointer in " |
339 | "back_lines().\n"); | |
b1c5f1c6 SR |
340 | exit(-1); |
341 | } | |
342 | page = buf + fpos - bytes_read; | |
343 | } else { /* Move backward BUF_SIZE/2 bytes */ | |
dec69da8 | 344 | if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR) == -1) { |
b1c5f1c6 | 345 | endwin(); |
dec69da8 SR |
346 | fprintf(stderr, "\nError moving file pointer " |
347 | "in back_lines().\n"); | |
b1c5f1c6 SR |
348 | exit(-1); |
349 | } | |
350 | page = buf + BUF_SIZE / 2; | |
351 | } | |
352 | if ((bytes_read = | |
353 | read(fd, buf, BUF_SIZE)) == -1) { | |
354 | endwin(); | |
dec69da8 | 355 | fprintf(stderr, "\nError reading file in back_lines().\n"); |
b1c5f1c6 SR |
356 | exit(-1); |
357 | } | |
358 | buf[bytes_read] = '\0'; | |
359 | } else { /* Beginning of file reached */ | |
360 | begin_reached = 1; | |
361 | return; | |
362 | } | |
1da177e4 | 363 | } |
b1c5f1c6 SR |
364 | if (*(--page) != '\n') { /* '--page' here */ |
365 | /* Something's wrong... */ | |
366 | endwin(); | |
367 | fprintf(stderr, "\nInternal error in back_lines().\n"); | |
368 | exit(-1); | |
1da177e4 | 369 | } |
1da177e4 | 370 | } |
b1c5f1c6 SR |
371 | /* Go back 'n' lines */ |
372 | for (i = 0; i < n; i++) | |
373 | do { | |
374 | if (page == buf) { | |
375 | if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) { | |
376 | endwin(); | |
dec69da8 | 377 | fprintf(stderr, "\nError moving file pointer in back_lines().\n"); |
b1c5f1c6 SR |
378 | exit(-1); |
379 | } | |
380 | if (fpos > bytes_read) { | |
381 | /* Really possible to move backward BUF_SIZE/2 bytes? */ | |
382 | if (fpos < BUF_SIZE / 2 + bytes_read) { | |
383 | /* No, move less then */ | |
dec69da8 | 384 | if (lseek(fd, 0, SEEK_SET) == -1) { |
b1c5f1c6 | 385 | endwin(); |
dec69da8 SR |
386 | fprintf(stderr, "\nError moving file pointer " |
387 | "in back_lines().\n"); | |
b1c5f1c6 SR |
388 | exit(-1); |
389 | } | |
390 | page = buf + fpos - bytes_read; | |
391 | } else { /* Move backward BUF_SIZE/2 bytes */ | |
dec69da8 | 392 | if (lseek (fd, -(BUF_SIZE / 2 + bytes_read), SEEK_CUR) == -1) { |
b1c5f1c6 | 393 | endwin(); |
dec69da8 SR |
394 | fprintf(stderr, "\nError moving file pointer" |
395 | " in back_lines().\n"); | |
b1c5f1c6 SR |
396 | exit(-1); |
397 | } | |
398 | page = buf + BUF_SIZE / 2; | |
399 | } | |
400 | if ((bytes_read = | |
401 | read(fd, buf, BUF_SIZE)) == -1) { | |
402 | endwin(); | |
dec69da8 SR |
403 | fprintf(stderr, "\nError reading file in " |
404 | "back_lines().\n"); | |
b1c5f1c6 SR |
405 | exit(-1); |
406 | } | |
407 | buf[bytes_read] = '\0'; | |
408 | } else { /* Beginning of file reached */ | |
409 | begin_reached = 1; | |
410 | return; | |
411 | } | |
1da177e4 | 412 | } |
b1c5f1c6 SR |
413 | } while (*(--page) != '\n'); |
414 | page++; | |
1da177e4 LT |
415 | } |
416 | ||
417 | /* | |
418 | * Print a new page of text. Called by dialog_textbox(). | |
419 | */ | |
b1c5f1c6 | 420 | static void print_page(WINDOW * win, int height, int width) |
1da177e4 | 421 | { |
b1c5f1c6 SR |
422 | int i, passed_end = 0; |
423 | ||
424 | page_length = 0; | |
425 | for (i = 0; i < height; i++) { | |
426 | print_line(win, i, width); | |
427 | if (!passed_end) | |
428 | page_length++; | |
429 | if (end_reached && !passed_end) | |
430 | passed_end = 1; | |
431 | } | |
432 | wnoutrefresh(win); | |
1da177e4 LT |
433 | } |
434 | ||
435 | /* | |
436 | * Print a new line of text. Called by dialog_textbox() and print_page(). | |
437 | */ | |
b1c5f1c6 | 438 | static void print_line(WINDOW * win, int row, int width) |
1da177e4 | 439 | { |
b1c5f1c6 SR |
440 | int y, x; |
441 | char *line; | |
1da177e4 | 442 | |
b1c5f1c6 SR |
443 | line = get_line(); |
444 | line += MIN(strlen(line), hscroll); /* Scroll horizontally */ | |
445 | wmove(win, row, 0); /* move cursor to correct line */ | |
446 | waddch(win, ' '); | |
447 | waddnstr(win, line, MIN(strlen(line), width - 2)); | |
1da177e4 | 448 | |
b1c5f1c6 SR |
449 | getyx(win, y, x); |
450 | /* Clear 'residue' of previous line */ | |
1da177e4 | 451 | #if OLD_NCURSES |
b1c5f1c6 SR |
452 | { |
453 | int i; | |
454 | for (i = 0; i < width - x; i++) | |
455 | waddch(win, ' '); | |
456 | } | |
1da177e4 | 457 | #else |
b1c5f1c6 | 458 | wclrtoeol(win); |
1da177e4 LT |
459 | #endif |
460 | } | |
461 | ||
462 | /* | |
463 | * Return current line of text. Called by dialog_textbox() and print_line(). | |
464 | * 'page' should point to start of current line before calling, and will be | |
465 | * updated to point to start of next line. | |
466 | */ | |
b1c5f1c6 | 467 | static char *get_line(void) |
1da177e4 | 468 | { |
b1c5f1c6 SR |
469 | int i = 0, fpos; |
470 | static char line[MAX_LEN + 1]; | |
471 | ||
472 | end_reached = 0; | |
473 | while (*page != '\n') { | |
474 | if (*page == '\0') { | |
475 | /* Either end of file or end of buffer reached */ | |
476 | if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) { | |
477 | endwin(); | |
dec69da8 SR |
478 | fprintf(stderr, "\nError moving file pointer in " |
479 | "get_line().\n"); | |
b1c5f1c6 SR |
480 | exit(-1); |
481 | } | |
482 | if (fpos < file_size) { /* Not end of file yet */ | |
483 | /* We've reached end of buffer, but not end of file yet, | |
484 | so read next part of file into buffer */ | |
485 | if ((bytes_read = | |
486 | read(fd, buf, BUF_SIZE)) == -1) { | |
487 | endwin(); | |
dec69da8 | 488 | fprintf(stderr, "\nError reading file in get_line().\n"); |
b1c5f1c6 SR |
489 | exit(-1); |
490 | } | |
491 | buf[bytes_read] = '\0'; | |
492 | page = buf; | |
493 | } else { | |
494 | if (!end_reached) | |
495 | end_reached = 1; | |
496 | break; | |
497 | } | |
498 | } else if (i < MAX_LEN) | |
499 | line[i++] = *(page++); | |
500 | else { | |
501 | /* Truncate lines longer than MAX_LEN characters */ | |
502 | if (i == MAX_LEN) | |
503 | line[i++] = '\0'; | |
504 | page++; | |
1da177e4 | 505 | } |
1da177e4 | 506 | } |
b1c5f1c6 SR |
507 | if (i <= MAX_LEN) |
508 | line[i] = '\0'; | |
509 | if (!end_reached) | |
510 | page++; /* move pass '\n' */ | |
1da177e4 | 511 | |
b1c5f1c6 | 512 | return line; |
1da177e4 LT |
513 | } |
514 | ||
515 | /* | |
516 | * Print current position | |
517 | */ | |
b1c5f1c6 | 518 | static void print_position(WINDOW * win, int height, int width) |
1da177e4 | 519 | { |
b1c5f1c6 SR |
520 | int fpos, percent; |
521 | ||
522 | if ((fpos = lseek(fd, 0, SEEK_CUR)) == -1) { | |
523 | endwin(); | |
dec69da8 | 524 | fprintf(stderr, "\nError moving file pointer in print_position().\n"); |
b1c5f1c6 SR |
525 | exit(-1); |
526 | } | |
527 | wattrset(win, position_indicator_attr); | |
528 | wbkgdset(win, position_indicator_attr & A_COLOR); | |
529 | percent = !file_size ? | |
530 | 100 : ((fpos - bytes_read + page - buf) * 100) / file_size; | |
531 | wmove(win, height - 3, width - 9); | |
532 | wprintw(win, "(%3d%%)", percent); | |
1da177e4 | 533 | } |