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)
12 static int begin_reached, end_reached, page_length;
13 static const char *buf, *page;
14 static size_t start, end;
17 * Go back 'n' lines in text. Called by dialog_textbox().
18 * 'page' will be updated to point to the desired line in 'buf'.
20 static void back_lines(int n)
25 /* Go back 'n' lines */
26 for (i = 0; i < n; i++) {
44 } while (*page != '\n');
50 * Return current line of text. Called by dialog_textbox() and print_line().
51 * 'page' should point to start of current line before calling, and will be
52 * updated to point to start of next line.
54 static char *get_line(void)
57 static char line[MAX_LEN + 1];
60 while (*page != '\n') {
64 } else if (i < MAX_LEN)
65 line[i++] = *(page++);
67 /* Truncate lines longer than MAX_LEN characters */
76 page++; /* move past '\n' */
82 * Print a new line of text.
84 static void print_line(WINDOW *win, int row, int width)
89 line += MIN(strlen(line), hscroll); /* Scroll horizontally */
90 wmove(win, row, 0); /* move cursor to correct line */
92 waddnstr(win, line, MIN(strlen(line), width - 2));
94 /* Clear 'residue' of previous line */
99 * Print a new page of text.
101 static void print_page(WINDOW *win, int height, int width)
103 int i, passed_end = 0;
106 for (i = 0; i < height; i++) {
107 print_line(win, i, width);
110 if (end_reached && !passed_end)
117 * Print current position
119 static void print_position(WINDOW *win)
123 wattrset(win, dlg.position_indicator.atr);
124 wbkgdset(win, dlg.position_indicator.atr & A_COLOR);
125 percent = (page - buf) * 100 / strlen(buf);
126 wmove(win, getmaxy(win) - 3, getmaxx(win) - 9);
127 wprintw(win, "(%3d%%)", percent);
131 * refresh window content
133 static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
134 int cur_y, int cur_x)
138 print_page(box, boxh, boxw);
139 print_position(dialog);
140 wmove(dialog, cur_y, cur_x); /* Restore cursor position */
147 * Display text from a file in a dialog box.
149 * keys is a null-terminated array
151 int dialog_textbox(const char *title, const char *tbuf, int initial_height,
152 int initial_width, int *_vscroll, int *_hscroll,
153 int (*extra_key_cb)(int, size_t, size_t, void *), void *data)
155 int i, x, y, cur_x, cur_y, key = 0;
156 int height, width, boxh, boxw;
157 WINDOW *dialog, *box;
165 page = buf; /* page is pointer to start of page to be displayed */
167 if (_vscroll && *_vscroll) {
170 for (i = 0; i < *_vscroll; i++)
177 getmaxyx(stdscr, height, width);
178 if (height < TEXTBOX_HEIGTH_MIN || width < TEXTBOX_WIDTH_MIN)
179 return -ERRDISPLAYTOOSMALL;
180 if (initial_height != 0)
181 height = initial_height;
187 if (initial_width != 0)
188 width = initial_width;
195 /* center dialog box on screen */
196 x = (getmaxx(stdscr) - width) / 2;
197 y = (getmaxy(stdscr) - height) / 2;
199 draw_shadow(stdscr, y, x, height, width);
201 dialog = newwin(height, width, y, x);
202 keypad(dialog, TRUE);
204 /* Create window for box region, used for scrolling text */
207 box = subwin(dialog, boxh, boxw, y + 1, x + 1);
208 wattrset(box, dlg.dialog.atr);
209 wbkgdset(box, dlg.dialog.atr & A_COLOR);
213 /* register the new window, along with its borders */
214 draw_box(dialog, 0, 0, height, width,
215 dlg.dialog.atr, dlg.border.atr);
217 wattrset(dialog, dlg.border.atr);
218 mvwaddch(dialog, height - 3, 0, ACS_LTEE);
219 for (i = 0; i < width - 2; i++)
220 waddch(dialog, ACS_HLINE);
221 wattrset(dialog, dlg.dialog.atr);
222 wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
223 waddch(dialog, ACS_RTEE);
225 print_title(dialog, title, width);
227 print_button(dialog, " Exit ", height - 2, width / 2 - 4, TRUE);
228 wnoutrefresh(dialog);
229 getyx(dialog, cur_y, cur_x); /* Save cursor position */
231 /* Print first page of text */
232 attr_clear(box, boxh, boxw, dlg.dialog.atr);
233 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
236 key = wgetch(dialog);
246 case 'g': /* First page */
248 if (!begin_reached) {
251 refresh_text_box(dialog, box, boxh, boxw,
255 case 'G': /* Last page */
259 /* point to last char in buf */
260 page = buf + strlen(buf);
262 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
264 case 'K': /* Previous line */
270 back_lines(page_length + 1);
271 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
273 case 'B': /* Previous page */
279 back_lines(page_length + boxh);
280 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
282 case 'J': /* Next line */
288 back_lines(page_length - 1);
289 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
291 case KEY_NPAGE: /* Next page */
298 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
300 case '0': /* Beginning of line */
301 case 'H': /* Scroll left */
311 /* Reprint current page to scroll horizontally */
312 back_lines(page_length);
313 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
315 case 'L': /* Scroll right */
318 if (hscroll >= MAX_LEN)
321 /* Reprint current page to scroll horizontally */
322 back_lines(page_length);
323 refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x);
326 if (on_key_esc(dialog) == KEY_ESC)
336 if (extra_key_cb && extra_key_cb(key, start, end, data)) {
349 back_lines(page_length);
350 while (s < page && (s = strchr(s, '\n'))) {