cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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menubox.c (10522B)


      1// SPDX-License-Identifier: GPL-2.0+
      2/*
      3 *  menubox.c -- implements the menu box
      4 *
      5 *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
      6 *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@cfw.com)
      7 */
      8
      9/*
     10 *  Changes by Clifford Wolf (god@clifford.at)
     11 *
     12 *  [ 1998-06-13 ]
     13 *
     14 *    *)  A bugfix for the Page-Down problem
     15 *
     16 *    *)  Formerly when I used Page Down and Page Up, the cursor would be set
     17 *        to the first position in the menu box.  Now lxdialog is a bit
     18 *        smarter and works more like other menu systems (just have a look at
     19 *        it).
     20 *
     21 *    *)  Formerly if I selected something my scrolling would be broken because
     22 *        lxdialog is re-invoked by the Menuconfig shell script, can't
     23 *        remember the last scrolling position, and just sets it so that the
     24 *        cursor is at the bottom of the box.  Now it writes the temporary file
     25 *        lxdialog.scrltmp which contains this information. The file is
     26 *        deleted by lxdialog if the user leaves a submenu or enters a new
     27 *        one, but it would be nice if Menuconfig could make another "rm -f"
     28 *        just to be sure.  Just try it out - you will recognise a difference!
     29 *
     30 *  [ 1998-06-14 ]
     31 *
     32 *    *)  Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files
     33 *        and menus change their size on the fly.
     34 *
     35 *    *)  If for some reason the last scrolling position is not saved by
     36 *        lxdialog, it sets the scrolling so that the selected item is in the
     37 *        middle of the menu box, not at the bottom.
     38 *
     39 * 02 January 1999, Michael Elizabeth Chastain (mec@shout.net)
     40 * Reset 'scroll' to 0 if the value from lxdialog.scrltmp is bogus.
     41 * This fixes a bug in Menuconfig where using ' ' to descend into menus
     42 * would leave mis-synchronized lxdialog.scrltmp files lying around,
     43 * fscanf would read in 'scroll', and eventually that value would get used.
     44 */
     45
     46#include "dialog.h"
     47
     48static int menu_width, item_x;
     49
     50/*
     51 * Print menu item
     52 */
     53static void do_print_item(WINDOW * win, const char *item, int line_y,
     54			  int selected, int hotkey)
     55{
     56	int j;
     57	char *menu_item = malloc(menu_width + 1);
     58
     59	strncpy(menu_item, item, menu_width - item_x);
     60	menu_item[menu_width - item_x] = '\0';
     61	j = first_alpha(menu_item, "YyNnMmHh");
     62
     63	/* Clear 'residue' of last item */
     64	wattrset(win, dlg.menubox.atr);
     65	wmove(win, line_y, 0);
     66#if OLD_NCURSES
     67	{
     68		int i;
     69		for (i = 0; i < menu_width; i++)
     70			waddch(win, ' ');
     71	}
     72#else
     73	wclrtoeol(win);
     74#endif
     75	wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
     76	mvwaddstr(win, line_y, item_x, menu_item);
     77	if (hotkey) {
     78		wattrset(win, selected ? dlg.tag_key_selected.atr
     79			 : dlg.tag_key.atr);
     80		mvwaddch(win, line_y, item_x + j, menu_item[j]);
     81	}
     82	if (selected) {
     83		wmove(win, line_y, item_x + 1);
     84	}
     85	free(menu_item);
     86	wrefresh(win);
     87}
     88
     89#define print_item(index, choice, selected)				\
     90do {									\
     91	item_set(index);						\
     92	do_print_item(menu, item_str(), choice, selected, !item_is_tag(':')); \
     93} while (0)
     94
     95/*
     96 * Print the scroll indicators.
     97 */
     98static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
     99			 int height)
    100{
    101	int cur_y, cur_x;
    102
    103	getyx(win, cur_y, cur_x);
    104
    105	wmove(win, y, x);
    106
    107	if (scroll > 0) {
    108		wattrset(win, dlg.uarrow.atr);
    109		waddch(win, ACS_UARROW);
    110		waddstr(win, "(-)");
    111	} else {
    112		wattrset(win, dlg.menubox.atr);
    113		waddch(win, ACS_HLINE);
    114		waddch(win, ACS_HLINE);
    115		waddch(win, ACS_HLINE);
    116		waddch(win, ACS_HLINE);
    117	}
    118
    119	y = y + height + 1;
    120	wmove(win, y, x);
    121	wrefresh(win);
    122
    123	if ((height < item_no) && (scroll + height < item_no)) {
    124		wattrset(win, dlg.darrow.atr);
    125		waddch(win, ACS_DARROW);
    126		waddstr(win, "(+)");
    127	} else {
    128		wattrset(win, dlg.menubox_border.atr);
    129		waddch(win, ACS_HLINE);
    130		waddch(win, ACS_HLINE);
    131		waddch(win, ACS_HLINE);
    132		waddch(win, ACS_HLINE);
    133	}
    134
    135	wmove(win, cur_y, cur_x);
    136	wrefresh(win);
    137}
    138
    139/*
    140 * Display the termination buttons.
    141 */
    142static void print_buttons(WINDOW * win, int height, int width, int selected)
    143{
    144	int x = width / 2 - 28;
    145	int y = height - 2;
    146
    147	print_button(win, "Select", y, x, selected == 0);
    148	print_button(win, " Exit ", y, x + 12, selected == 1);
    149	print_button(win, " Help ", y, x + 24, selected == 2);
    150	print_button(win, " Save ", y, x + 36, selected == 3);
    151	print_button(win, " Load ", y, x + 48, selected == 4);
    152
    153	wmove(win, y, x + 1 + 12 * selected);
    154	wrefresh(win);
    155}
    156
    157/* scroll up n lines (n may be negative) */
    158static void do_scroll(WINDOW *win, int *scroll, int n)
    159{
    160	/* Scroll menu up */
    161	scrollok(win, TRUE);
    162	wscrl(win, n);
    163	scrollok(win, FALSE);
    164	*scroll = *scroll + n;
    165	wrefresh(win);
    166}
    167
    168/*
    169 * Display a menu for choosing among a number of options
    170 */
    171int dialog_menu(const char *title, const char *prompt,
    172		const void *selected, int *s_scroll)
    173{
    174	int i, j, x, y, box_x, box_y;
    175	int height, width, menu_height;
    176	int key = 0, button = 0, scroll = 0, choice = 0;
    177	int first_item =  0, max_choice;
    178	WINDOW *dialog, *menu;
    179
    180do_resize:
    181	height = getmaxy(stdscr);
    182	width = getmaxx(stdscr);
    183	if (height < MENUBOX_HEIGTH_MIN || width < MENUBOX_WIDTH_MIN)
    184		return -ERRDISPLAYTOOSMALL;
    185
    186	height -= 4;
    187	width  -= 5;
    188	menu_height = height - 10;
    189
    190	max_choice = MIN(menu_height, item_count());
    191
    192	/* center dialog box on screen */
    193	x = (getmaxx(stdscr) - width) / 2;
    194	y = (getmaxy(stdscr) - height) / 2;
    195
    196	draw_shadow(stdscr, y, x, height, width);
    197
    198	dialog = newwin(height, width, y, x);
    199	keypad(dialog, TRUE);
    200
    201	draw_box(dialog, 0, 0, height, width,
    202		 dlg.dialog.atr, dlg.border.atr);
    203	wattrset(dialog, dlg.border.atr);
    204	mvwaddch(dialog, height - 3, 0, ACS_LTEE);
    205	for (i = 0; i < width - 2; i++)
    206		waddch(dialog, ACS_HLINE);
    207	wattrset(dialog, dlg.dialog.atr);
    208	wbkgdset(dialog, dlg.dialog.atr & A_COLOR);
    209	waddch(dialog, ACS_RTEE);
    210
    211	print_title(dialog, title, width);
    212
    213	wattrset(dialog, dlg.dialog.atr);
    214	print_autowrap(dialog, prompt, width - 2, 1, 3);
    215
    216	menu_width = width - 6;
    217	box_y = height - menu_height - 5;
    218	box_x = (width - menu_width) / 2 - 1;
    219
    220	/* create new window for the menu */
    221	menu = subwin(dialog, menu_height, menu_width,
    222		      y + box_y + 1, x + box_x + 1);
    223	keypad(menu, TRUE);
    224
    225	/* draw a box around the menu items */
    226	draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
    227		 dlg.menubox_border.atr, dlg.menubox.atr);
    228
    229	if (menu_width >= 80)
    230		item_x = (menu_width - 70) / 2;
    231	else
    232		item_x = 4;
    233
    234	/* Set choice to default item */
    235	item_foreach()
    236		if (selected && (selected == item_data()))
    237			choice = item_n();
    238	/* get the saved scroll info */
    239	scroll = *s_scroll;
    240	if ((scroll <= choice) && (scroll + max_choice > choice) &&
    241	   (scroll >= 0) && (scroll + max_choice <= item_count())) {
    242		first_item = scroll;
    243		choice = choice - scroll;
    244	} else {
    245		scroll = 0;
    246	}
    247	if ((choice >= max_choice)) {
    248		if (choice >= item_count() - max_choice / 2)
    249			scroll = first_item = item_count() - max_choice;
    250		else
    251			scroll = first_item = choice - max_choice / 2;
    252		choice = choice - scroll;
    253	}
    254
    255	/* Print the menu */
    256	for (i = 0; i < max_choice; i++) {
    257		print_item(first_item + i, i, i == choice);
    258	}
    259
    260	wnoutrefresh(menu);
    261
    262	print_arrows(dialog, item_count(), scroll,
    263		     box_y, box_x + item_x + 1, menu_height);
    264
    265	print_buttons(dialog, height, width, 0);
    266	wmove(menu, choice, item_x + 1);
    267	wrefresh(menu);
    268
    269	while (key != KEY_ESC) {
    270		key = wgetch(menu);
    271
    272		if (key < 256 && isalpha(key))
    273			key = tolower(key);
    274
    275		if (strchr("ynmh", key))
    276			i = max_choice;
    277		else {
    278			for (i = choice + 1; i < max_choice; i++) {
    279				item_set(scroll + i);
    280				j = first_alpha(item_str(), "YyNnMmHh");
    281				if (key == tolower(item_str()[j]))
    282					break;
    283			}
    284			if (i == max_choice)
    285				for (i = 0; i < max_choice; i++) {
    286					item_set(scroll + i);
    287					j = first_alpha(item_str(), "YyNnMmHh");
    288					if (key == tolower(item_str()[j]))
    289						break;
    290				}
    291		}
    292
    293		if (item_count() != 0 &&
    294		    (i < max_choice ||
    295		     key == KEY_UP || key == KEY_DOWN ||
    296		     key == '-' || key == '+' ||
    297		     key == KEY_PPAGE || key == KEY_NPAGE)) {
    298			/* Remove highligt of current item */
    299			print_item(scroll + choice, choice, FALSE);
    300
    301			if (key == KEY_UP || key == '-') {
    302				if (choice < 2 && scroll) {
    303					/* Scroll menu down */
    304					do_scroll(menu, &scroll, -1);
    305
    306					print_item(scroll, 0, FALSE);
    307				} else
    308					choice = MAX(choice - 1, 0);
    309
    310			} else if (key == KEY_DOWN || key == '+') {
    311				print_item(scroll+choice, choice, FALSE);
    312
    313				if ((choice > max_choice - 3) &&
    314				    (scroll + max_choice < item_count())) {
    315					/* Scroll menu up */
    316					do_scroll(menu, &scroll, 1);
    317
    318					print_item(scroll+max_choice - 1,
    319						   max_choice - 1, FALSE);
    320				} else
    321					choice = MIN(choice + 1, max_choice - 1);
    322
    323			} else if (key == KEY_PPAGE) {
    324				scrollok(menu, TRUE);
    325				for (i = 0; (i < max_choice); i++) {
    326					if (scroll > 0) {
    327						do_scroll(menu, &scroll, -1);
    328						print_item(scroll, 0, FALSE);
    329					} else {
    330						if (choice > 0)
    331							choice--;
    332					}
    333				}
    334
    335			} else if (key == KEY_NPAGE) {
    336				for (i = 0; (i < max_choice); i++) {
    337					if (scroll + max_choice < item_count()) {
    338						do_scroll(menu, &scroll, 1);
    339						print_item(scroll+max_choice-1,
    340							   max_choice - 1, FALSE);
    341					} else {
    342						if (choice + 1 < max_choice)
    343							choice++;
    344					}
    345				}
    346			} else
    347				choice = i;
    348
    349			print_item(scroll + choice, choice, TRUE);
    350
    351			print_arrows(dialog, item_count(), scroll,
    352				     box_y, box_x + item_x + 1, menu_height);
    353
    354			wnoutrefresh(dialog);
    355			wrefresh(menu);
    356
    357			continue;	/* wait for another key press */
    358		}
    359
    360		switch (key) {
    361		case KEY_LEFT:
    362		case TAB:
    363		case KEY_RIGHT:
    364			button = ((key == KEY_LEFT ? --button : ++button) < 0)
    365			    ? 4 : (button > 4 ? 0 : button);
    366
    367			print_buttons(dialog, height, width, button);
    368			wrefresh(menu);
    369			break;
    370		case ' ':
    371		case 's':
    372		case 'y':
    373		case 'n':
    374		case 'm':
    375		case '/':
    376		case 'h':
    377		case '?':
    378		case 'z':
    379		case '\n':
    380			/* save scroll info */
    381			*s_scroll = scroll;
    382			delwin(menu);
    383			delwin(dialog);
    384			item_set(scroll + choice);
    385			item_set_selected(1);
    386			switch (key) {
    387			case 'h':
    388			case '?':
    389				return 2;
    390			case 's':
    391			case 'y':
    392				return 5;
    393			case 'n':
    394				return 6;
    395			case 'm':
    396				return 7;
    397			case ' ':
    398				return 8;
    399			case '/':
    400				return 9;
    401			case 'z':
    402				return 10;
    403			case '\n':
    404				return button;
    405			}
    406			return 0;
    407		case 'e':
    408		case 'x':
    409			key = KEY_ESC;
    410			break;
    411		case KEY_ESC:
    412			key = on_key_esc(menu);
    413			break;
    414		case KEY_RESIZE:
    415			on_key_resize();
    416			delwin(menu);
    417			delwin(dialog);
    418			goto do_resize;
    419		}
    420	}
    421	delwin(menu);
    422	delwin(dialog);
    423	return key;		/* ESC pressed */
    424}