1 // SPDX-License-Identifier: GPL-2.0+
3 * textbox.c -- implements the text box
5 * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
6 * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
11 static void back_lines(int n);
12 static void print_page(WINDOW *win, int height, int width, update_text_fn
13 update_text, void *data);
14 static void print_line(WINDOW *win, int row, int width);
15 static char *get_line(void);
16 static void print_position(WINDOW * win);
19 static int begin_reached, end_reached, page_length;
24 * refresh window content
26 static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
27 int cur_y, int cur_x, update_text_fn update_text,
30 print_page(box, boxh, boxw, update_text, data);
31 print_position(dialog);
32 wmove(dialog, cur_y, cur_x); /* Restore cursor position */
38 * Display text from a file in a dialog box.
40 * keys is a null-terminated array
41 * update_text() may not add or remove any '\n' or '\0' in tbuf
43 int 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)
47 int i, x, y, cur_x, cur_y, key = 0;
48 int height, width, boxh, boxw;
57 page = buf; /* page is pointer to start of page to be displayed */
59 if (_vscroll && *_vscroll) {
62 for (i = 0; i < *_vscroll; i++)
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;
79 if (initial_width != 0)
80 width = initial_width;
87 /* center dialog box on screen */
88 x = (getmaxx(stdscr) - width) / 2;
89 y = (getmaxy(stdscr) - height) / 2;
91 draw_shadow(stdscr, y, x, height, width);
93 dialog = newwin(height, width, y, x);
96 /* Create window for box region, used for scrolling text */
99 box = subwin(dialog, boxh, boxw, y + 1, x + 1);
100 wattrset(box, dlg.dialog.atr);
101 wbkgdset(box, dlg.dialog.atr & A_COLOR);
105 /* register the new window, along with its borders */
106 draw_box(dialog, 0, 0, height, width,
107 dlg.dialog.atr, dlg.border.atr);
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);
117 print_title(dialog, title, width);
119 print_button(dialog, " Exit ", height - 2, width / 2 - 4, TRUE);
120 wnoutrefresh(dialog);
121 getyx(dialog, cur_y, cur_x); /* Save cursor position */
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,
129 key = wgetch(dialog);
139 case 'g': /* First page */
141 if (!begin_reached) {
144 refresh_text_box(dialog, box, boxh, boxw,
145 cur_y, cur_x, update_text,
149 case 'G': /* Last page */
153 /* point to last char in buf */
154 page = buf + strlen(buf);
156 refresh_text_box(dialog, box, boxh, boxw, cur_y,
157 cur_x, update_text, data);
159 case 'K': /* Previous line */
165 back_lines(page_length + 1);
166 refresh_text_box(dialog, box, boxh, boxw, cur_y,
167 cur_x, update_text, data);
169 case 'B': /* Previous page */
175 back_lines(page_length + boxh);
176 refresh_text_box(dialog, box, boxh, boxw, cur_y,
177 cur_x, update_text, data);
179 case 'J': /* Next line */
185 back_lines(page_length - 1);
186 refresh_text_box(dialog, box, boxh, boxw, cur_y,
187 cur_x, update_text, data);
189 case KEY_NPAGE: /* Next page */
196 refresh_text_box(dialog, box, boxh, boxw, cur_y,
197 cur_x, update_text, data);
199 case '0': /* Beginning of line */
200 case 'H': /* Scroll left */
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);
215 case 'L': /* Scroll right */
218 if (hscroll >= MAX_LEN)
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);
227 if (on_key_esc(dialog) == KEY_ESC)
237 for (i = 0; keys[i]; i++) {
238 if (key == keys[i]) {
252 back_lines(page_length);
253 while (s < page && (s = strchr(s, '\n'))) {
264 * Go back 'n' lines in text. Called by dialog_textbox().
265 * 'page' will be updated to point to the desired line in 'buf'.
267 static void back_lines(int n)
272 /* Go back 'n' lines */
273 for (i = 0; i < n; i++) {
291 } while (*page != '\n');
297 * Print a new page of text.
299 static void print_page(WINDOW *win, int height, int width, update_text_fn
300 update_text, void *data)
302 int i, passed_end = 0;
307 for (i = 0; i < height; i++)
311 update_text(buf, page - buf, end - buf, data);
315 for (i = 0; i < height; i++) {
316 print_line(win, i, width);
319 if (end_reached && !passed_end)
326 * Print a new line of text.
328 static void print_line(WINDOW * win, int row, int width)
333 line += MIN(strlen(line), hscroll); /* Scroll horizontally */
334 wmove(win, row, 0); /* move cursor to correct line */
336 waddnstr(win, line, MIN(strlen(line), width - 2));
338 /* Clear 'residue' of previous line */
341 int x = getcurx(win);
343 for (i = 0; i < width - x; i++)
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.
356 static char *get_line(void)
359 static char line[MAX_LEN + 1];
362 while (*page != '\n') {
366 } else if (i < MAX_LEN)
367 line[i++] = *(page++);
369 /* Truncate lines longer than MAX_LEN characters */
378 page++; /* move past '\n' */
384 * Print current position
386 static void print_position(WINDOW * win)
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);