1 /****************************************************************************
2 * Copyright 2019-2021,2022 Thomas E. Dickey *
3 * Copyright 2017 Free Software Foundation, Inc. *
4 * *
5 * Permission is hereby granted, free of charge, to any person obtaining a *
6 * copy of this software and associated documentation files (the *
7 * "Software"), to deal in the Software without restriction, including *
8 * without limitation the rights to use, copy, modify, merge, publish, *
9 * distribute, distribute with modifications, sublicense, and/or sell *
10 * copies of the Software, and to permit persons to whom the Software is *
11 * furnished to do so, subject to the following conditions: *
12 * *
13 * The above copyright notice and this permission notice shall be included *
14 * in all copies or substantial portions of the Software. *
15 * *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
19 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
20 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
21 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
22 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
23 * *
24 * Except as contained in this notice, the name(s) of the above copyright *
25 * holders shall not be used in advertising or otherwise to promote the *
26 * sale, use or other dealings in this Software without prior written *
27 * authorization. *
28 ****************************************************************************/
29 /*
30 * clone of view.c, using pads
31 *
32 * $Id: padview.c,v 1.22 2022/12/04 00:40:11 tom Exp $
33 */
34
35 #include <test.priv.h>
36 #include <widechars.h>
37 #include <popup_msg.h>
38
39 #include <sys/stat.h>
40 #include <time.h>
41
42 #if HAVE_NEWPAD
43
44 static GCC_NORETURN void finish(int sig);
45
46 #define my_pair 1
47
48 static WINDOW *global_pad;
49 static int shift = 0;
50 static bool try_color = FALSE;
51
52 static char *fname;
53 static int num_lines;
54
55 #if USE_WIDEC_SUPPORT
56 static bool n_option = FALSE;
57 #endif
58
59 static void
failed(const char * msg)60 failed(const char *msg)
61 {
62 endwin();
63 fprintf(stderr, "%s\n", msg);
64 ExitProgram(EXIT_FAILURE);
65 }
66
67 static void
finish(int sig)68 finish(int sig)
69 {
70 endwin();
71 if (global_pad != NULL)
72 delwin(global_pad);
73 ExitProgram(sig != 0 ? EXIT_FAILURE : EXIT_SUCCESS);
74 }
75
76 static void
show_all(const char * tag,WINDOW * my_pad,int my_row)77 show_all(const char *tag, WINDOW *my_pad, int my_row)
78 {
79 int i;
80 int digits;
81 char temp[BUFSIZ];
82 time_t this_time;
83
84 for (digits = 1, i = num_lines; i > 0; i /= 10) {
85 ++digits;
86 }
87
88 wattrset(stdscr, COLOR_PAIR(my_pair));
89 clear();
90
91 _nc_SPRINTF(temp, _nc_SLIMIT(sizeof(temp))
92 "view %.*s", (int) strlen(tag), tag);
93 i = (int) strlen(temp);
94 _nc_SPRINTF(temp + i, _nc_SLIMIT(sizeof(temp) - (size_t) i)
95 " %.*s", (int) sizeof(temp) - i - 2, fname);
96 mvprintw(0, 0, "%.*s", COLS, temp);
97 this_time = time((time_t *) 0);
98 _nc_STRNCPY(temp, ctime(&this_time), (size_t) 30);
99 if ((i = (int) strlen(temp)) != 0) {
100 temp[--i] = 0;
101 mvprintw(0, COLS - i - 2, " %s", temp);
102 }
103
104 for (i = 1; i < LINES; i++) {
105 int actual = my_row + i;
106 if (actual > num_lines) {
107 break;
108 }
109 mvprintw(i, 0, "%*d:", digits, actual);
110 }
111 wnoutrefresh(stdscr);
112 pnoutrefresh(my_pad, my_row, shift, 1, digits + 1, LINES - 1, COLS - 1);
113 doupdate();
114 }
115
116 static WINDOW *
read_file(const char * filename)117 read_file(const char *filename)
118 {
119 FILE *fp;
120 int pass;
121 int k;
122 int height, width;
123 size_t j;
124 size_t len;
125 struct stat sb;
126 char *my_blob;
127 char **my_vec = 0;
128 WINDOW *my_pad;
129
130 if (stat(filename, &sb) != 0
131 || (sb.st_mode & S_IFMT) != S_IFREG) {
132 failed("input is not a file");
133 }
134
135 if (sb.st_size == 0) {
136 failed("input is empty");
137 }
138
139 if ((fp = fopen(filename, "r")) == 0) {
140 failed("cannot open input-file");
141 }
142
143 if ((my_blob = malloc((size_t) sb.st_size + 1)) == 0) {
144 failed("cannot allocate memory for input-file");
145 }
146
147 len = fread(my_blob, sizeof(char), (size_t) sb.st_size, fp);
148 fclose(fp);
149
150 if (len > (size_t) sb.st_size)
151 len = (size_t) sb.st_size;
152 my_blob[len] = '\0';
153
154 for (pass = 0; pass < 2; ++pass) {
155 char *base = my_blob;
156 k = 0;
157 for (j = 0; j < len; ++j) {
158 if (my_blob[j] == '\n') {
159 if (pass) {
160 my_vec[k] = base;
161 my_blob[j] = '\0';
162 }
163 base = my_blob + j + 1;
164 ++k;
165 }
166 }
167 if (base != (my_blob + j)) {
168 if (pass)
169 my_vec[k] = base;
170 ++k;
171 }
172 num_lines = k;
173 if (pass == 0) {
174 if (((my_vec = typeCalloc(char *, (size_t) k + 2)) == 0)) {
175 failed("cannot allocate line-vector #1");
176 }
177 } else {
178 if (my_vec[0] == NULL)
179 my_vec[0] = my_blob;
180 }
181 }
182
183 #if USE_WIDEC_SUPPORT
184 if (!memcmp("\357\273\277", my_blob, 3)) {
185 char *s = my_blob + 3;
186 char *d = my_blob;
187 Trace(("trim BOM"));
188 do {
189 } while ((*d++ = *s++) != '\0');
190 }
191 #endif
192
193 height = num_lines;
194 width = (int) strlen(my_vec[0]);
195 for (k = 1; my_vec[k]; ++k) {
196 int check = (int) (my_vec[k] - my_vec[k - 1]);
197 if (width < check)
198 width = check;
199 }
200 width = (width + 1) * 5;
201 my_pad = newpad(height, width);
202 if (my_pad == 0)
203 failed("cannot allocate pad workspace");
204 if (try_color) {
205 wattrset(my_pad, COLOR_PAIR(my_pair));
206 wbkgd(my_pad, (chtype) (' ' | COLOR_PAIR(my_pair)));
207 }
208
209 /*
210 * Use the curses library for rendering, including tab-conversion.
211 */
212 Trace(("slurp the file"));
213 for (k = 0; my_vec[k]; ++k) {
214 char *s;
215 #if USE_WIDEC_SUPPORT
216 char *last = my_vec[k] + (int) strlen(my_vec[k]);
217 wchar_t wch[2];
218 size_t rc;
219 #ifndef state_unused
220 mbstate_t state;
221 #endif
222 #endif /* USE_WIDEC_SUPPORT */
223
224 wmove(my_pad, k, 0);
225 #if USE_WIDEC_SUPPORT
226 wch[1] = 0;
227 reset_mbytes(state);
228 #endif
229 for (s = my_vec[k]; *s != '\0'; ++s) {
230 #if USE_WIDEC_SUPPORT
231 if (!n_option) {
232 rc = (size_t) check_mbytes(wch[0], s, (size_t) (last - s), state);
233 if ((long) rc == -1 || (long) rc == -2) {
234 break;
235 }
236 s += rc - 1;
237 waddwstr(my_pad, wch);
238 } else
239 #endif
240 waddch(my_pad, *s & 0xff);
241 }
242 }
243
244 free(my_vec);
245 free(my_blob);
246
247 return my_pad;
248 }
249
250 static void
usage(int ok)251 usage(int ok)
252 {
253 static const char *msg[] =
254 {
255 "Usage: view [options] file"
256 ,""
257 ,USAGE_COMMON
258 ,"Options:"
259 ," -c use color if terminal supports it"
260 ," -i ignore INT, QUIT, TERM signals"
261 #if USE_WIDEC_SUPPORT
262 ," -n use waddch (bytes) rather then wadd_wch (wide-chars)"
263 #endif
264 ," -s start in single-step mode, waiting for input"
265 #ifdef TRACE
266 ," -t trace screen updates"
267 ," -T NUM specify trace mask"
268 #endif
269 };
270 size_t n;
271 for (n = 0; n < SIZEOF(msg); n++)
272 fprintf(stderr, "%s\n", msg[n]);
273 ExitProgram(ok ? EXIT_SUCCESS : EXIT_FAILURE);
274 }
275 /* *INDENT-OFF* */
VERSION_COMMON()276 VERSION_COMMON()
277 /* *INDENT-ON* */
278
279 int
280 main(int argc, char *argv[])
281 {
282 static const char *help[] =
283 {
284 "Commands:",
285 " q,^Q,ESC - quit this program",
286 "",
287 " p,<Up> - scroll the viewport up by one row",
288 " n,<Down> - scroll the viewport down by one row",
289 " l,<Left> - scroll the viewport left by one column",
290 " r,<Right> - scroll the viewport right by one column",
291 " <,> - scroll the viewport left/right by 8 columns",
292 "",
293 " h,<Home> - scroll the viewport to top of file",
294 " ^F,<PageDn> - scroll to the next page",
295 " ^B,<PageUp> - scroll to the previous page",
296 " e,<End> - scroll the viewport to end of file",
297 "",
298 " ^L - repaint using redrawwin()",
299 "",
300 " 0 through 9 - enter digits for count",
301 " s - use entered count for halfdelay() parameter",
302 " - if no entered count, stop nodelay()",
303 " <space> - begin nodelay()",
304 0
305 };
306
307 int ch;
308 int i;
309 int my_delay = 0;
310 WINDOW *my_pad;
311 int my_row = 0;
312 int value = 0;
313 bool done = FALSE;
314 bool got_number = FALSE;
315 bool ignore_sigs = FALSE;
316 bool single_step = FALSE;
317 const char *my_label = "Input";
318
319 setlocale(LC_ALL, "");
320
321 while ((ch = getopt(argc, argv, OPTS_COMMON "cinstT:")) != -1) {
322 switch (ch) {
323 case 'c':
324 try_color = TRUE;
325 break;
326 case 'i':
327 ignore_sigs = TRUE;
328 break;
329 #if USE_WIDEC_SUPPORT
330 case 'n':
331 n_option = TRUE;
332 break;
333 #endif
334 case 's':
335 single_step = TRUE;
336 break;
337 #ifdef TRACE
338 case 'T':
339 {
340 char *next = 0;
341 int tvalue = (int) strtol(optarg, &next, 0);
342 if (tvalue < 0 || (next != 0 && *next != 0))
343 usage(FALSE);
344 curses_trace((unsigned) tvalue);
345 }
346 break;
347 case 't':
348 curses_trace(TRACE_CALLS);
349 break;
350 #endif
351 case OPTS_VERSION:
352 show_version(argv);
353 ExitProgram(EXIT_SUCCESS);
354 default:
355 usage(ch == OPTS_USAGE);
356 /* NOTREACHED */
357 }
358 }
359 if (optind + 1 != argc)
360 usage(FALSE);
361
362 InitAndCatch(initscr(), ignore_sigs ? SIG_IGN : finish);
363 keypad(stdscr, TRUE); /* enable keyboard mapping */
364 (void) nonl(); /* tell curses not to do NL->CR/NL on output */
365 (void) cbreak(); /* take input chars one at a time, no wait for \n */
366 (void) noecho(); /* don't echo input */
367 if (!single_step)
368 nodelay(stdscr, TRUE);
369 idlok(stdscr, TRUE); /* allow use of insert/delete line */
370
371 if (try_color) {
372 if (has_colors()) {
373 start_color();
374 init_pair(my_pair, COLOR_WHITE, COLOR_BLUE);
375 bkgd((chtype) (' ' | COLOR_PAIR(my_pair)));
376 } else {
377 try_color = FALSE;
378 }
379 }
380
381 /*
382 * Do this after starting color, otherwise the pad's background will be
383 * uncolored after the ncurses 6.1.20181208 fixes.
384 */
385 global_pad =
386 my_pad = read_file(fname = argv[optind]);
387
388 my_row = 0;
389 while (!done) {
390 int n, c;
391
392 if (!got_number)
393 show_all(my_label, my_pad, my_row);
394
395 for (;;) {
396 c = getch();
397 if ((c < 127) && isdigit(c)) {
398 if (!got_number) {
399 MvPrintw(0, 0, "Count: ");
400 clrtoeol();
401 }
402 addch(UChar(c));
403 value = 10 * value + (c - '0');
404 got_number = TRUE;
405 } else
406 break;
407 }
408 if (got_number && value) {
409 n = value;
410 } else {
411 n = 1;
412 }
413
414 if (c != ERR)
415 my_label = keyname(c);
416 switch (c) {
417 case KEY_DOWN:
418 case 'n':
419 for (i = 0; i < n; i++)
420 if (my_row < (num_lines - LINES + 1))
421 my_row++;
422 else
423 break;
424 break;
425
426 case KEY_UP:
427 case 'p':
428 for (i = 0; i < n; i++)
429 if (my_row > 0)
430 my_row--;
431 else
432 break;
433 break;
434
435 case 'h':
436 /* FALLTHRU */
437 case KEY_HOME:
438 my_row = 0;
439 break;
440
441 case '<':
442 if ((shift -= 8) < 0)
443 shift = 0;
444 break;
445 case '>':
446 shift += 8;
447 break;
448
449 case 'e':
450 /* FALLTHRU */
451 case KEY_END:
452 if (num_lines > LINES)
453 my_row = (num_lines - LINES + 1);
454 else
455 my_row = (num_lines - 2);
456 break;
457
458 case CTRL('F'):
459 /* FALLTHRU */
460 case KEY_NPAGE:
461 for (i = 0; i < n; i++) {
462 if (my_row < (num_lines - 5))
463 my_row += (LINES - 1);
464 else
465 my_row = (num_lines - 2);
466 }
467 break;
468
469 case CTRL('B'):
470 /* FALLTHRU */
471 case KEY_PPAGE:
472 for (i = 0; i < n; i++) {
473 if (my_row >= LINES)
474 my_row -= (LINES - 1);
475 else
476 my_row = 0;
477 }
478 break;
479
480 case 'r':
481 case KEY_RIGHT:
482 shift += n;
483 break;
484
485 case 'l':
486 case KEY_LEFT:
487 shift -= n;
488 if (shift < 0) {
489 shift = 0;
490 beep();
491 }
492 break;
493
494 case 'q':
495 case QUIT:
496 case ESCAPE:
497 done = TRUE;
498 break;
499
500 #ifdef KEY_RESIZE
501 case KEY_RESIZE: /* ignore this; ncurses will repaint */
502 break;
503 #endif
504 case 's':
505 #if HAVE_HALFDELAY
506 if (got_number) {
507 halfdelay(my_delay = n);
508 } else {
509 nodelay(stdscr, FALSE);
510 my_delay = -1;
511 }
512 #else
513 nodelay(stdscr, FALSE);
514 my_delay = -1;
515 #endif
516 break;
517 case ' ':
518 nodelay(stdscr, TRUE);
519 my_delay = 0;
520 break;
521 case CTRL('L'):
522 redrawwin(stdscr);
523 break;
524 case ERR:
525 if (!my_delay)
526 napms(50);
527 break;
528 case HELP_KEY_1:
529 popup_msg(stdscr, help);
530 break;
531 default:
532 beep();
533 break;
534 }
535 if (c >= KEY_MIN || (c > 0 && !isdigit(c))) {
536 got_number = FALSE;
537 value = 0;
538 }
539 }
540
541 finish(0); /* we're done */
542 }
543 #else
544 int
main(void)545 main(void)
546 {
547 printf("This program requires the curses pad functions\n");
548 ExitProgram(EXIT_FAILURE);
549 }
550 #endif
551