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-rw-r--r--scripts/kconfig/lxdialog/textbox.c395
1 files changed, 395 insertions, 0 deletions
diff --git a/scripts/kconfig/lxdialog/textbox.c b/scripts/kconfig/lxdialog/textbox.c
new file mode 100644
index 000000000..4e339b126
--- /dev/null
+++ b/scripts/kconfig/lxdialog/textbox.c
@@ -0,0 +1,395 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * textbox.c -- implements the text box
+ *
+ * ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
+ * MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
+ */
+
+#include "dialog.h"
+
+static void back_lines(int n);
+static void print_page(WINDOW *win, int height, int width, update_text_fn
+ update_text, void *data);
+static void print_line(WINDOW *win, int row, int width);
+static char *get_line(void);
+static void print_position(WINDOW * win);
+
+static int hscroll;
+static int begin_reached, end_reached, page_length;
+static char *buf;
+static char *page;
+
+/*
+ * refresh window content
+ */
+static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
+ int cur_y, int cur_x, update_text_fn update_text,
+ void *data)
+{
+ print_page(box, boxh, boxw, update_text, data);
+ print_position(dialog);
+ wmove(dialog, cur_y, cur_x); /* Restore cursor position */
+ wrefresh(dialog);
+}
+
+
+/*
+ * Display text from a file in a dialog box.
+ *
+ * keys is a null-terminated array
+ * update_text() may not add or remove any '\n' or '\0' in tbuf
+ */
+int dialog_textbox(const char *title, char *tbuf, int initial_height,
+ int initial_width, int *keys, int *_vscroll, int *_hscroll,
+ update_text_fn update_text, void *data)
+{
+ int i, x, y, cur_x, cur_y, key = 0;
+ int height, width, boxh, boxw;
+ WINDOW *dialog, *box;
+ bool done = false;
+
+ begin_reached = 1;
+ end_reached = 0;
+ page_length = 0;
+ hscroll = 0;
+ buf = tbuf;
+ page = buf; /* page is pointer to start of page to be displayed */
+
+ if (_vscroll && *_vscroll) {
+ begin_reached = 0;
+
+ for (i = 0; i < *_vscroll; i++)
+ get_line();
+ }
+ if (_hscroll)
+ hscroll = *_hscroll;
+
+do_resize:
+ getmaxyx(stdscr, height, width);
+ if (height < TEXTBOX_HEIGTH_MIN || width < TEXTBOX_WIDTH_MIN)
+ return -ERRDISPLAYTOOSMALL;
+ if (initial_height != 0)
+ height = initial_height;
+ else
+ if (height > 4)
+ height -= 4;
+ else
+ height = 0;
+ if (initial_width != 0)
+ width = initial_width;
+ else
+ if (width > 5)
+ width -= 5;
+ else
+ width = 0;
+
+ /* center dialog box on screen */
+ x = (getmaxx(stdscr) - width) / 2;
+ y = (getmaxy(stdscr) - height) / 2;
+
+ draw_shadow(stdscr, y, x, height, width);
+
+ dialog = newwin(height, width, y, x);
+ keypad(dialog, TRUE);
+
+ /* Create window for box region, used for scrolling text */
+ boxh = height - 4;
+ boxw = width - 2;
+ box = subwin(dialog, boxh, boxw, y + 1, x + 1);
+ wattrset(box, dlg.dialog.atr);
+ wbkgdset(box, dlg.dialog.atr & A_COLOR);
+
+ keypad(box, TRUE);
+
+ /* register the new window, along with its borders */
+ draw_box(dialog, 0, 0, height, width,
+ dlg.dialog.atr, dlg.border.atr);
+
+ wattrset(dialog, dlg.border.atr);
+ mvwaddch(dialog, height - 3, 0, ACS_LTEE);
+ for (i = 0; i < width - 2; i++)
+ waddch(dialog, ACS_HLINE);
+ wattrset(dialog, dlg.dialog.atr);
+ wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
+ waddch(dialog, ACS_RTEE);
+
+ print_title(dialog, title, width);
+
+ print_button(dialog, " Exit ", height - 2, width / 2 - 4, TRUE);
+ wnoutrefresh(dialog);
+ getyx(dialog, cur_y, cur_x); /* Save cursor position */
+
+ /* Print first page of text */
+ attr_clear(box, boxh, boxw, dlg.dialog.atr);
+ refresh_text_box(dialog, box, boxh, boxw, cur_y, cur_x, update_text,
+ data);
+
+ while (!done) {
+ key = wgetch(dialog);
+ switch (key) {
+ case 'E': /* Exit */
+ case 'e':
+ case 'X':
+ case 'x':
+ case 'q':
+ case '\n':
+ done = true;
+ break;
+ case 'g': /* First page */
+ case KEY_HOME:
+ if (!begin_reached) {
+ begin_reached = 1;
+ page = buf;
+ refresh_text_box(dialog, box, boxh, boxw,
+ cur_y, cur_x, update_text,
+ data);
+ }
+ break;
+ case 'G': /* Last page */
+ case KEY_END:
+
+ end_reached = 1;
+ /* point to last char in buf */
+ page = buf + strlen(buf);
+ back_lines(boxh);
+ refresh_text_box(dialog, box, boxh, boxw, cur_y,
+ cur_x, update_text, data);
+ break;
+ case 'K': /* Previous line */
+ case 'k':
+ case KEY_UP:
+ if (begin_reached)
+ break;
+
+ back_lines(page_length + 1);
+ refresh_text_box(dialog, box, boxh, boxw, cur_y,
+ cur_x, update_text, data);
+ break;
+ case 'B': /* Previous page */
+ case 'b':
+ case 'u':
+ case KEY_PPAGE:
+ if (begin_reached)
+ break;
+ back_lines(page_length + boxh);
+ refresh_text_box(dialog, box, boxh, boxw, cur_y,
+ cur_x, update_text, data);
+ break;
+ case 'J': /* Next line */
+ case 'j':
+ case KEY_DOWN:
+ if (end_reached)
+ break;
+
+ back_lines(page_length - 1);
+ refresh_text_box(dialog, box, boxh, boxw, cur_y,
+ cur_x, update_text, data);
+ break;
+ case KEY_NPAGE: /* Next page */
+ case ' ':
+ case 'd':
+ if (end_reached)
+ break;
+
+ begin_reached = 0;
+ refresh_text_box(dialog, box, boxh, boxw, cur_y,
+ cur_x, update_text, data);
+ break;
+ case '0': /* Beginning of line */
+ case 'H': /* Scroll left */
+ case 'h':
+ case KEY_LEFT:
+ if (hscroll <= 0)
+ break;
+
+ if (key == '0')
+ hscroll = 0;
+ else
+ hscroll--;
+ /* Reprint current page to scroll horizontally */
+ back_lines(page_length);
+ refresh_text_box(dialog, box, boxh, boxw, cur_y,
+ cur_x, update_text, data);
+ break;
+ case 'L': /* Scroll right */
+ case 'l':
+ case KEY_RIGHT:
+ if (hscroll >= MAX_LEN)
+ break;
+ hscroll++;
+ /* Reprint current page to scroll horizontally */
+ back_lines(page_length);
+ refresh_text_box(dialog, box, boxh, boxw, cur_y,
+ cur_x, update_text, data);
+ break;
+ case KEY_ESC:
+ if (on_key_esc(dialog) == KEY_ESC)
+ done = true;
+ break;
+ case KEY_RESIZE:
+ back_lines(height);
+ delwin(box);
+ delwin(dialog);
+ on_key_resize();
+ goto do_resize;
+ default:
+ for (i = 0; keys[i]; i++) {
+ if (key == keys[i]) {
+ done = true;
+ break;
+ }
+ }
+ }
+ }
+ delwin(box);
+ delwin(dialog);
+ if (_vscroll) {
+ const char *s;
+
+ s = buf;
+ *_vscroll = 0;
+ back_lines(page_length);
+ while (s < page && (s = strchr(s, '\n'))) {
+ (*_vscroll)++;
+ s++;
+ }
+ }
+ if (_hscroll)
+ *_hscroll = hscroll;
+ return key;
+}
+
+/*
+ * Go back 'n' lines in text. Called by dialog_textbox().
+ * 'page' will be updated to point to the desired line in 'buf'.
+ */
+static void back_lines(int n)
+{
+ int i;
+
+ begin_reached = 0;
+ /* Go back 'n' lines */
+ for (i = 0; i < n; i++) {
+ if (*page == '\0') {
+ if (end_reached) {
+ end_reached = 0;
+ continue;
+ }
+ }
+ if (page == buf) {
+ begin_reached = 1;
+ return;
+ }
+ page--;
+ do {
+ if (page == buf) {
+ begin_reached = 1;
+ return;
+ }
+ page--;
+ } while (*page != '\n');
+ page++;
+ }
+}
+
+/*
+ * Print a new page of text.
+ */
+static void print_page(WINDOW *win, int height, int width, update_text_fn
+ update_text, void *data)
+{
+ int i, passed_end = 0;
+
+ if (update_text) {
+ char *end;
+
+ for (i = 0; i < height; i++)
+ get_line();
+ end = page;
+ back_lines(height);
+ update_text(buf, page - buf, end - buf, data);
+ }
+
+ page_length = 0;
+ for (i = 0; i < height; i++) {
+ print_line(win, i, width);
+ if (!passed_end)
+ page_length++;
+ if (end_reached && !passed_end)
+ passed_end = 1;
+ }
+ wnoutrefresh(win);
+}
+
+/*
+ * Print a new line of text.
+ */
+static void print_line(WINDOW * win, int row, int width)
+{
+ char *line;
+
+ line = get_line();
+ line += MIN(strlen(line), hscroll); /* Scroll horizontally */
+ wmove(win, row, 0); /* move cursor to correct line */
+ waddch(win, ' ');
+ waddnstr(win, line, MIN(strlen(line), width - 2));
+
+ /* Clear 'residue' of previous line */
+#if OLD_NCURSES
+ {
+ int x = getcurx(win);
+ int i;
+ for (i = 0; i < width - x; i++)
+ waddch(win, ' ');
+ }
+#else
+ wclrtoeol(win);
+#endif
+}
+
+/*
+ * Return current line of text. Called by dialog_textbox() and print_line().
+ * 'page' should point to start of current line before calling, and will be
+ * updated to point to start of next line.
+ */
+static char *get_line(void)
+{
+ int i = 0;
+ static char line[MAX_LEN + 1];
+
+ end_reached = 0;
+ while (*page != '\n') {
+ if (*page == '\0') {
+ end_reached = 1;
+ break;
+ } else if (i < MAX_LEN)
+ line[i++] = *(page++);
+ else {
+ /* Truncate lines longer than MAX_LEN characters */
+ if (i == MAX_LEN)
+ line[i++] = '\0';
+ page++;
+ }
+ }
+ if (i <= MAX_LEN)
+ line[i] = '\0';
+ if (!end_reached)
+ page++; /* move past '\n' */
+
+ return line;
+}
+
+/*
+ * Print current position
+ */
+static void print_position(WINDOW * win)
+{
+ int percent;
+
+ wattrset(win, dlg.position_indicator.atr);
+ wbkgdset(win, dlg.position_indicator.atr & A_COLOR);
+ percent = (page - buf) * 100 / strlen(buf);
+ wmove(win, getmaxy(win) - 3, getmaxx(win) - 9);
+ wprintw(win, "(%3d%%)", percent);
+}
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