1 /*
2 * $Id: tailbox.c,v 1.72 2018/06/19 22:57:01 tom Exp $
3 *
4 * tailbox.c -- implements the tail box
5 *
6 * Copyright 2000-2012,2018 Thomas E. Dickey
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU Lesser General Public License, version 2.1
10 * as published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this program; if not, write to
19 * Free Software Foundation, Inc.
20 * 51 Franklin St., Fifth Floor
21 * Boston, MA 02110, USA.
22 *
23 * An earlier version of this program lists as authors
24 * Pasquale De Marco ([email protected])
25 */
26
27 #include <dialog.h>
28 #include <dlg_keys.h>
29 #include <sys/stat.h>
30
31 typedef struct {
32 DIALOG_CALLBACK obj;
33 WINDOW *text;
34 const char **buttons;
35 int hscroll;
36 int old_hscroll;
37 char line[MAX_LEN + 2];
38 off_t last_pos;
39 } MY_OBJ;
40
41 /*
42 * Return current line of text.
43 */
44 static char *
get_line(MY_OBJ * obj)45 get_line(MY_OBJ * obj)
46 {
47 FILE *fp = obj->obj.input;
48 int col = -(obj->hscroll);
49 int j, tmpint, ch;
50
51 do {
52 if (((ch = getc(fp)) == EOF) && !feof(fp))
53 dlg_exiterr("Error moving file pointer in get_line().");
54 else if (!feof(fp) && (ch != '\n')) {
55 if ((ch == TAB) && (dialog_vars.tab_correct)) {
56 tmpint = dialog_state.tab_len
57 - ((col + obj->hscroll) % dialog_state.tab_len);
58 for (j = 0; j < tmpint; j++) {
59 if (col >= 0 && col < MAX_LEN)
60 obj->line[col] = ' ';
61 ++col;
62 }
63 } else {
64 if (col >= 0)
65 obj->line[col] = (char) ch;
66 ++col;
67 }
68 if (col >= MAX_LEN)
69 break;
70 }
71 } while (!feof(fp) && (ch != '\n'));
72
73 if (col < 0)
74 col = 0;
75 obj->line[col] = '\0';
76
77 return obj->line;
78 }
79
80 /*
81 * Print a new line of text.
82 */
83 static void
print_line(MY_OBJ * obj,WINDOW * win,int row,int width)84 print_line(MY_OBJ * obj, WINDOW *win, int row, int width)
85 {
86 int i, y, x;
87 char *line = get_line(obj);
88
89 (void) wmove(win, row, 0); /* move cursor to correct line */
90 (void) waddch(win, ' ');
91 (void) waddnstr(win, line, MIN((int) strlen(line), width - 2));
92
93 getyx(win, y, x);
94 (void) y;
95 /* Clear 'residue' of previous line */
96 for (i = 0; i < width - x; i++)
97 (void) waddch(win, ' ');
98 }
99
100 /*
101 * Go back 'target' lines in text file. BUFSIZ has to be in 'size_t' range.
102 */
103 static void
last_lines(MY_OBJ * obj,int target)104 last_lines(MY_OBJ * obj, int target)
105 {
106 FILE *fp = obj->obj.input;
107 size_t inx;
108 int count = 0;
109 char buf[BUFSIZ + 1];
110 size_t size_to_read;
111 size_t size_as_read;
112 long offset = 0;
113 long fpos = 0;
114
115 if (fseek(fp, 0L, SEEK_END) == -1
116 || (fpos = ftell(fp)) < 0)
117 dlg_exiterr("Error moving file pointer in last_lines().");
118
119 if (fpos != 0) {
120 ++target;
121 for (;;) {
122 if (fpos >= BUFSIZ) {
123 size_to_read = BUFSIZ;
124 } else {
125 size_to_read = (size_t) fpos;
126 }
127 fpos = fpos - (long) size_to_read;
128 if (fseek(fp, fpos, SEEK_SET) == -1)
129 dlg_exiterr("Error moving file pointer in last_lines().");
130 size_as_read = fread(buf, sizeof(char), size_to_read, fp);
131 if (ferror(fp))
132 dlg_exiterr("Error reading file in last_lines().");
133
134 if (size_as_read == 0) {
135 fpos = 0;
136 offset = 0;
137 break;
138 }
139
140 offset += (long) size_as_read;
141 for (inx = size_as_read - 1; inx != 0; --inx) {
142 if (buf[inx] == '\n') {
143 if (++count > target)
144 break;
145 offset = (long) (inx + 1);
146 }
147 }
148
149 if (count > target) {
150 break;
151 } else if (fpos == 0) {
152 offset = 0;
153 break;
154 }
155 }
156
157 if (fseek(fp, fpos + offset, SEEK_SET) == -1)
158 dlg_exiterr("Error moving file pointer in last_lines().");
159 }
160 }
161
162 /*
163 * Print a new page of text.
164 */
165 static void
print_page(MY_OBJ * obj,int height,int width)166 print_page(MY_OBJ * obj, int height, int width)
167 {
168 int i;
169
170 for (i = 0; i < height; i++) {
171 print_line(obj, obj->text, i, width);
172 }
173 (void) wnoutrefresh(obj->text);
174 }
175
176 static void
print_last_page(MY_OBJ * obj)177 print_last_page(MY_OBJ * obj)
178 {
179 int high = getmaxy(obj->obj.win) - (2 * MARGIN + (obj->obj.bg_task ? 1 : 3));
180 int wide = getmaxx(obj->text);
181
182 last_lines(obj, high);
183 print_page(obj, high, wide);
184 }
185
186 static void
repaint_text(MY_OBJ * obj)187 repaint_text(MY_OBJ * obj)
188 {
189 FILE *fp = obj->obj.input;
190 int cur_y, cur_x;
191
192 getyx(obj->obj.win, cur_y, cur_x);
193 obj->old_hscroll = obj->hscroll;
194
195 print_last_page(obj);
196 obj->last_pos = ftell(fp);
197
198 (void) wmove(obj->obj.win, cur_y, cur_x); /* Restore cursor position */
199 wrefresh(obj->obj.win);
200 }
201
202 static bool
handle_input(DIALOG_CALLBACK * cb)203 handle_input(DIALOG_CALLBACK * cb)
204 {
205 MY_OBJ *obj = (MY_OBJ *) cb;
206 FILE *fp = obj->obj.input;
207 struct stat sb;
208
209 if (fstat(fileno(fp), &sb) == 0
210 && sb.st_size != obj->last_pos) {
211 repaint_text(obj);
212 }
213
214 return TRUE;
215 }
216
217 static bool
valid_callback(DIALOG_CALLBACK * cb)218 valid_callback(DIALOG_CALLBACK * cb)
219 {
220 bool valid = FALSE;
221 DIALOG_CALLBACK *p;
222 for (p = dialog_state.getc_callbacks; p != 0; p = p->next) {
223 if (p == cb) {
224 valid = TRUE;
225 break;
226 }
227 }
228 return valid;
229 }
230
231 static bool
handle_my_getc(DIALOG_CALLBACK * cb,int ch,int fkey,int * result)232 handle_my_getc(DIALOG_CALLBACK * cb, int ch, int fkey, int *result)
233 {
234 MY_OBJ *obj = (MY_OBJ *) cb;
235 bool done = FALSE;
236
237 if (!valid_callback(cb))
238 return FALSE;
239
240 if (!fkey && dlg_char_to_button(ch, obj->buttons) == 0) {
241 ch = DLGK_ENTER;
242 fkey = TRUE;
243 }
244
245 if (fkey) {
246 switch (ch) {
247 case DLGK_ENTER:
248 *result = DLG_EXIT_OK;
249 done = TRUE;
250 break;
251 case DLGK_BEGIN: /* Beginning of line */
252 obj->hscroll = 0;
253 break;
254 case DLGK_GRID_LEFT: /* Scroll left */
255 if (obj->hscroll > 0) {
256 obj->hscroll -= 1;
257 }
258 break;
259 case DLGK_GRID_RIGHT: /* Scroll right */
260 if (obj->hscroll < MAX_LEN)
261 obj->hscroll += 1;
262 break;
263 default:
264 beep();
265 break;
266 }
267 if ((obj->hscroll != obj->old_hscroll))
268 repaint_text(obj);
269 } else {
270 switch (ch) {
271 case ERR:
272 clearerr(cb->input);
273 ch = getc(cb->input);
274 (void) ungetc(ch, cb->input);
275 if (ch != EOF) {
276 handle_input(cb);
277 }
278 break;
279 case ESC:
280 done = TRUE;
281 *result = DLG_EXIT_ESC;
282 break;
283 default:
284 beep();
285 break;
286 }
287 }
288
289 return !done;
290 }
291
292 /*
293 * Display text from a file in a dialog box, like in a "tail -f".
294 */
295 int
dialog_tailbox(const char * title,const char * filename,int height,int width,int bg_task)296 dialog_tailbox(const char *title,
297 const char *filename,
298 int height,
299 int width,
300 int bg_task)
301 {
302 /* *INDENT-OFF* */
303 static DLG_KEYS_BINDING binding[] = {
304 HELPKEY_BINDINGS,
305 ENTERKEY_BINDINGS,
306 DLG_KEYS_DATA( DLGK_BEGIN, '0' ),
307 DLG_KEYS_DATA( DLGK_BEGIN, KEY_BEG ),
308 DLG_KEYS_DATA( DLGK_GRID_LEFT, 'H' ),
309 DLG_KEYS_DATA( DLGK_GRID_LEFT, 'h' ),
310 DLG_KEYS_DATA( DLGK_GRID_LEFT, KEY_LEFT ),
311 DLG_KEYS_DATA( DLGK_GRID_RIGHT, 'L' ),
312 DLG_KEYS_DATA( DLGK_GRID_RIGHT, 'l' ),
313 DLG_KEYS_DATA( DLGK_GRID_RIGHT, KEY_RIGHT ),
314 END_KEYS_BINDING
315 };
316 /* *INDENT-ON* */
317
318 #ifdef KEY_RESIZE
319 int old_height = height;
320 int old_width = width;
321 #endif
322 int fkey;
323 int x, y, result, thigh;
324 WINDOW *dialog, *text;
325 const char **buttons = 0;
326 MY_OBJ *obj;
327 FILE *fd;
328 int min_width = 12;
329
330 DLG_TRACE(("# tailbox args:\n"));
331 DLG_TRACE2S("title", title);
332 DLG_TRACE2S("filename", filename);
333 DLG_TRACE2N("height", height);
334 DLG_TRACE2N("width", width);
335 DLG_TRACE2N("bg_task", bg_task);
336
337 /* Open input file for reading */
338 if ((fd = fopen(filename, "rb")) == NULL)
339 dlg_exiterr("Can't open input file in dialog_tailbox().");
340
341 #ifdef KEY_RESIZE
342 retry:
343 #endif
344 dlg_auto_sizefile(title, filename, &height, &width, 2, min_width);
345 dlg_print_size(height, width);
346 dlg_ctl_size(height, width);
347
348 x = dlg_box_x_ordinate(width);
349 y = dlg_box_y_ordinate(height);
350 thigh = height - ((2 * MARGIN) + (bg_task ? 0 : 2));
351
352 dialog = dlg_new_window(height, width, y, x);
353
354 dlg_mouse_setbase(x, y);
355
356 /* Create window for text region, used for scrolling text */
357 text = dlg_sub_window(dialog,
358 thigh,
359 width - (2 * MARGIN),
360 y + MARGIN,
361 x + MARGIN);
362
363 dlg_draw_box2(dialog, 0, 0, height, width, dialog_attr, border_attr, border2_attr);
364 dlg_draw_bottom_box2(dialog, border_attr, border2_attr, dialog_attr);
365 dlg_draw_title(dialog, title);
366 dlg_draw_helpline(dialog, FALSE);
367
368 if (!bg_task) {
369 buttons = dlg_exit_label();
370 dlg_button_layout(buttons, &min_width);
371 dlg_draw_buttons(dialog, height - (2 * MARGIN), 0, buttons, FALSE,
372 FALSE, width);
373 }
374
375 (void) wmove(dialog, thigh, (MARGIN + 1));
376 (void) wnoutrefresh(dialog);
377
378 obj = dlg_calloc(MY_OBJ, 1);
379 assert_ptr(obj, "dialog_tailbox");
380
381 obj->obj.input = fd;
382 obj->obj.win = dialog;
383 obj->obj.handle_getc = handle_my_getc;
384 obj->obj.handle_input = bg_task ? handle_input : 0;
385 obj->obj.keep_bg = bg_task && dialog_vars.cant_kill;
386 obj->obj.bg_task = bg_task;
387 obj->text = text;
388 obj->buttons = buttons;
389 dlg_add_callback(&(obj->obj));
390
391 dlg_register_window(dialog, "tailbox", binding);
392 dlg_register_buttons(dialog, "tailbox", buttons);
393
394 /* Print last page of text */
395 dlg_attr_clear(text, thigh, getmaxx(text), dialog_attr);
396 repaint_text(obj);
397
398 dlg_trace_win(dialog);
399 if (bg_task) {
400 result = DLG_EXIT_OK;
401 } else {
402 int ch;
403 do {
404 ch = dlg_getc(dialog, &fkey);
405 #ifdef KEY_RESIZE
406 if (fkey && ch == KEY_RESIZE) {
407 dlg_will_resize(dialog);
408 /* reset data */
409 height = old_height;
410 width = old_width;
411 /* repaint */
412 dlg_clear();
413 dlg_del_window(dialog);
414 refresh();
415 dlg_mouse_free_regions();
416 dlg_button_layout(buttons, &min_width);
417 goto retry;
418 }
419 #endif
420 }
421 while (handle_my_getc(&(obj->obj), ch, fkey, &result));
422 }
423 dlg_mouse_free_regions();
424 return result;
425 }
426