/*
   * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
   * Released under the terms of the GNU GPL v2.0.
   *
   * Introduced single menu mode (show all sub-menus in one large tree).
   * 2002-11-06 Petr Baudis <pasky@ucw.cz>
   *
   * i18n, 2005, Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   */
  
  #include <ctype.h>
  #include <errno.h>
  #include <fcntl.h>
  #include <limits.h>
  #include <stdarg.h>
  #include <stdlib.h>
  #include <string.h>
  #include <signal.h>
  #include <unistd.h>
  #include <locale.h>
  
  #include "lkc.h"
  #include "lxdialog/dialog.h"
  
  static const char mconf_readme[] = N_(
  "Overview
  "
  "--------
  "
  "This interface lets you select features and parameters for the build.
  "
  "Features can either be built-in, modularized, or ignored. Parameters
  "
  "must be entered in as decimal or hexadecimal numbers or text.
  "
  "
  "
  "Menu items beginning with following braces represent features that
  "
  "  [ ] can be built in or removed
  "
  "  < > can be built in, modularized or removed
  "
  "  { } can be built in or modularized (selected by other feature)
  "
  "  - - are selected by other feature,
  "
  "while *, M or whitespace inside braces means to build in, build as
  "
  "a module or to exclude the feature respectively.
  "
  "
  "
  "To change any of these features, highlight it with the cursor
  "
  "keys and press <Y> to build it in, <M> to make it a module or
  "
  "<N> to remove it.  You may also press the <Space Bar> to cycle
  "
  "through the available options (i.e. Y->N->M->Y).
  "
  "
  "
  "Some additional keyboard hints:
  "
  "
  "
  "Menus
  "
  "----------
  "
  "o  Use the Up/Down arrow keys (cursor keys) to highlight the item you
  "
  "   wish to change or the submenu you wish to select and press <Enter>.
  "
  "   Submenus are designated by \"--->\", empty ones by \"----\".
  "
  "
  "
  "   Shortcut: Press the option's highlighted letter (hotkey).
  "
  "             Pressing a hotkey more than once will sequence
  "
  "             through all visible items which use that hotkey.
  "
  "
  "
  "   You may also use the <PAGE UP> and <PAGE DOWN> keys to scroll
  "
  "   unseen options into view.
  "
  "
  "
  "o  To exit a menu use the cursor keys to highlight the <Exit> button
  "
  "   and press <ENTER>.
  "
  "
  "
  "   Shortcut: Press <ESC><ESC> or <E> or <X> if there is no hotkey
  "
  "             using those letters.  You may press a single <ESC>, but
  "
  "             there is a delayed response which you may find annoying.
  "
  "
  "
  "   Also, the <TAB> and cursor keys will cycle between <Select>,
  "
  "   <Exit>, <Help>, <Save>, and <Load>.
  "
  "
  "
  "o  To get help with an item, use the cursor keys to highlight <Help>
  "
  "   and press <ENTER>.
  "
  "
  "
  "   Shortcut: Press <H> or <?>.
  "
  "
  "
  "o  To toggle the display of hidden options, press <Z>.
  "
  "
  "
  "
  "
  "Radiolists  (Choice lists)
  "
  "-----------
  "
  "o  Use the cursor keys to select the option you wish to set and press
  "
  "   <S> or the <SPACE BAR>.
  "
  "
  "
  "   Shortcut: Press the first letter of the option you wish to set then
  "
  "             press <S> or <SPACE BAR>.
  "
  "
  "
  "o  To see available help for the item, use the cursor keys to highlight
  "
  "   <Help> and Press <ENTER>.
  "
  "
  "
  "   Shortcut: Press <H> or <?>.
  "
  "
  "
  "   Also, the <TAB> and cursor keys will cycle between <Select> and
  "
  "   <Help>
  "
  "
  "
  "
  "
  "Data Entry
  "
  "-----------
  "
  "o  Enter the requested information and press <ENTER>
  "
  "   If you are entering hexadecimal values, it is not necessary to
  "
  "   add the '0x' prefix to the entry.
  "
  "
  "
  "o  For help, use the <TAB> or cursor keys to highlight the help option
  "
  "   and press <ENTER>.  You can try <TAB><H> as well.
  "
  "
  "
  "
  "
  "Text Box    (Help Window)
  "
  "--------
  "
  "o  Use the cursor keys to scroll up/down/left/right.  The VI editor
  "
  "   keys h,j,k,l function here as do <u>, <d>, <SPACE BAR> and <B> for
  "
  "   those who are familiar with less and lynx.
  "
  "
  "
  "o  Press <E>, <X>, <q>, <Enter> or <Esc><Esc> to exit.
  "
  "
  "
  "
  "
  "Alternate Configuration Files
  "
  "-----------------------------
  "
  "Menuconfig supports the use of alternate configuration files for
  "
  "those who, for various reasons, find it necessary to switch
  "
  "between different configurations.
  "
  "
  "
  "The <Save> button will let you save the current configuration to
  "
  "a file of your choosing.  Use the <Load> button to load a previously
  "
  "saved alternate configuration.
  "
  "
  "
  "Even if you don't use alternate configuration files, but you find
  "
  "during a Menuconfig session that you have completely messed up your
  "
  "settings, you may use the <Load> button to restore your previously
  "
  "saved settings from \".config\" without restarting Menuconfig.
  "
  "
  "
  "Other information
  "
  "-----------------
  "
  "If you use Menuconfig in an XTERM window, make sure you have your
  "
  "$TERM variable set to point to an xterm definition which supports
  "
  "color.  Otherwise, Menuconfig will look rather bad.  Menuconfig will
  "
  "not display correctly in an RXVT window because rxvt displays only one
  "
  "intensity of color, bright.
  "
  "
  "
  "Menuconfig will display larger menus on screens or xterms which are
  "
  "set to display more than the standard 25 row by 80 column geometry.
  "
  "In order for this to work, the \"stty size\" command must be able to
  "
  "display the screen's current row and column geometry.  I STRONGLY
  "
  "RECOMMEND that you make sure you do NOT have the shell variables
  "
  "LINES and COLUMNS exported into your environment.  Some distributions
  "
  "export those variables via /etc/profile.  Some ncurses programs can
  "
  "become confused when those variables (LINES & COLUMNS) don't reflect
  "
  "the true screen size.
  "
  "
  "
  "Optional personality available
  "
  "------------------------------
  "
  "If you prefer to have all of the options listed in a single menu,
  "
  "rather than the default multimenu hierarchy, run the menuconfig with
  "
  "MENUCONFIG_MODE environment variable set to single_menu. Example:
  "
  "
  "
  "make MENUCONFIG_MODE=single_menu menuconfig
  "
  "
  "
  "<Enter> will then unroll the appropriate category, or enfold it if it
  "
  "is already unrolled.
  "
  "
  "
  "Note that this mode can eventually be a little more CPU expensive
  "
  "(especially with a larger number of unrolled categories) than the
  "
  "default mode.
  "
  "
  "
  "Different color themes available
  "
  "--------------------------------
  "
  "It is possible to select different color themes using the variable
  "
  "MENUCONFIG_COLOR. To select a theme use:
  "
  "
  "
  "make MENUCONFIG_COLOR=<theme> menuconfig
  "
  "
  "
  "Available themes are
  "
  " mono       => selects colors suitable for monochrome displays
  "
  " blackbg    => selects a color scheme with black background
  "
  " classic    => theme with blue background. The classic look
  "
  " bluetitle  => an LCD friendly version of classic. (default)
  "
  "
  "),
  menu_instructions[] = N_(
  	"Arrow keys navigate the menu.  "
  	"<Enter> selects submenus ---> (or empty submenus ----).  "
  	"Highlighted letters are hotkeys.  "
  	"Pressing <Y> includes, <N> excludes, <M> modularizes features.  "
  	"Press <Esc><Esc> to exit, <?> for Help, </> for Search.  "
  	"Legend: [*] built-in  [ ] excluded  <M> module  < > module capable"),
  radiolist_instructions[] = N_(
  	"Use the arrow keys to navigate this window or "
  	"press the hotkey of the item you wish to select "
  	"followed by the <SPACE BAR>. "
  	"Press <?> for additional information about this option."),
  inputbox_instructions_int[] = N_(
  	"Please enter a decimal value. "
  	"Fractions will not be accepted.  "
  	"Use the <TAB> key to move from the input field to the buttons below it."),
  inputbox_instructions_hex[] = N_(
  	"Please enter a hexadecimal value. "
  	"Use the <TAB> key to move from the input field to the buttons below it."),
  inputbox_instructions_string[] = N_(
  	"Please enter a string value. "
  	"Use the <TAB> key to move from the input field to the buttons below it."),
  setmod_text[] = N_(
  	"This feature depends on another which has been configured as a module.
  "
  	"As a result, this feature will be built as a module."),
  load_config_text[] = N_(
  	"Enter the name of the configuration file you wish to load.  "
  	"Accept the name shown to restore the configuration you "
  	"last retrieved.  Leave blank to abort."),
  load_config_help[] = N_(
  	"
  "
  	"For various reasons, one may wish to keep several different
  "
  	"configurations available on a single machine.
  "
  	"
  "
  	"If you have saved a previous configuration in a file other than the
  "
  	"default one, entering its name here will allow you to modify that
  "
  	"configuration.
  "
  	"
  "
  	"If you are uncertain, then you have probably never used alternate
  "
  	"configuration files. You should therefore leave this blank to abort.
  "),
  save_config_text[] = N_(
  	"Enter a filename to which this configuration should be saved "
  	"as an alternate.  Leave blank to abort."),
  save_config_help[] = N_(
  	"
  "
  	"For various reasons, one may wish to keep different configurations
  "
  	"available on a single machine.
  "
  	"
  "
  	"Entering a file name here will allow you to later retrieve, modify
  "
  	"and use the current configuration as an alternate to whatever
  "
  	"configuration options you have selected at that time.
  "
  	"
  "
  	"If you are uncertain what all this means then you should probably
  "
  	"leave this blank.
  "),
  search_help[] = N_(
  	"
  "
  	"Search for symbols and display their relations.
  "
  	"Regular expressions are allowed.
  "
  	"Example: search for \"^FOO\"
  "
  	"Result:
  "
  	"-----------------------------------------------------------------
  "
  	"Symbol: FOO [=m]
  "
  	"Type  : tristate
  "
  	"Prompt: Foo bus is used to drive the bar HW
  "
  	"  Location:
  "
  	"    -> Bus options (PCI, PCMCIA, EISA, ISA)
  "
  	"      -> PCI support (PCI [=y])
  "
  	"(1)     -> PCI access mode (<choice> [=y])
  "
  	"  Defined at drivers/pci/Kconfig:47
  "
  	"  Depends on: X86_LOCAL_APIC && X86_IO_APIC || IA64
  "
  	"  Selects: LIBCRC32
  "
  	"  Selected by: BAR [=n]
  "
  	"-----------------------------------------------------------------
  "
  	"o The line 'Type:' shows the type of the configuration option for
  "
  	"  this symbol (boolean, tristate, string, ...)
  "
  	"o The line 'Prompt:' shows the text used in the menu structure for
  "
  	"  this symbol
  "
  	"o The 'Defined at' line tells at what file / line number the symbol
  "
  	"  is defined
  "
  	"o The 'Depends on:' line tells what symbols need to be defined for
  "
  	"  this symbol to be visible in the menu (selectable)
  "
  	"o The 'Location:' lines tells where in the menu structure this symbol
  "
  	"  is located
  "
  	"    A location followed by a [=y] indicates that this is a
  "
  	"    selectable menu item - and the current value is displayed inside
  "
  	"    brackets.
  "
  	"    Press the key in the (#) prefix to jump directly to that
  "
  	"    location. You will be returned to the current search results
  "
  	"    after exiting this new menu.
  "
  	"o The 'Selects:' line tells what symbols will be automatically
  "
  	"  selected if this symbol is selected (y or m)
  "
  	"o The 'Selected by' line tells what symbol has selected this symbol
  "
  	"
  "
  	"Only relevant lines are shown.
  "
  	"
  
  "
  	"Search examples:
  "
  	"Examples: USB	=> find all symbols containing USB
  "
  	"          ^USB => find all symbols starting with USB
  "
  	"          USB$ => find all symbols ending with USB
  "
  	"
  ");
  
  static int indent;
  static struct menu *current_menu;
  static int child_count;
  static int single_menu_mode;
  static int show_all_options;
  static int save_and_exit;
  
  static void conf(struct menu *menu, struct menu *active_menu);
  static void conf_choice(struct menu *menu);
  static void conf_string(struct menu *menu);
  static void conf_load(void);
  static void conf_save(void);
  static int show_textbox_ext(const char *title, char *text, int r, int c,
  			    int *keys, int *vscroll, int *hscroll,
  			    update_text_fn update_text, void *data);
  static void show_textbox(const char *title, const char *text, int r, int c);
  static void show_helptext(const char *title, const char *text);
  static void show_help(struct menu *menu);
  
  static char filename[PATH_MAX+1];
  static void set_config_filename(const char *config_filename)
  {
  	static char menu_backtitle[PATH_MAX+128];
  	int size;
  
  	size = snprintf(menu_backtitle, sizeof(menu_backtitle),
  			"%s - %s", config_filename, rootmenu.prompt->text);
  	if (size >= sizeof(menu_backtitle))
  		menu_backtitle[sizeof(menu_backtitle)-1] = '\0';
  	set_dialog_backtitle(menu_backtitle);
  
  	size = snprintf(filename, sizeof(filename), "%s", config_filename);
  	if (size >= sizeof(filename))
  		filename[sizeof(filename)-1] = '\0';
  }
  
  struct subtitle_part {
  	struct list_head entries;
  	const char *text;
  };
  static LIST_HEAD(trail);
  
  static struct subtitle_list *subtitles;
  static void set_subtitle(void)
  {
  	struct subtitle_part *sp;
  	struct subtitle_list *pos, *tmp;
  
  	for (pos = subtitles; pos != NULL; pos = tmp) {
  		tmp = pos->next;
  		free(pos);
  	}
  
  	subtitles = NULL;
  	list_for_each_entry(sp, &trail, entries) {
  		if (sp->text) {
  			if (pos) {
  				pos->next = xcalloc(sizeof(*pos), 1);
  				pos = pos->next;
  			} else {
  				subtitles = pos = xcalloc(sizeof(*pos), 1);
  			}
  			pos->text = sp->text;
  		}
  	}
  
  	set_dialog_subtitles(subtitles);
  }
  
  static void reset_subtitle(void)
  {
  	struct subtitle_list *pos, *tmp;
  
  	for (pos = subtitles; pos != NULL; pos = tmp) {
  		tmp = pos->next;
  		free(pos);
  	}
  	subtitles = NULL;
  	set_dialog_subtitles(subtitles);
  }
  
  struct search_data {
  	struct list_head *head;
  	struct menu **targets;
  	int *keys;
  };
  
  static void update_text(char *buf, size_t start, size_t end, void *_data)
  {
  	struct search_data *data = _data;
  	struct jump_key *pos;
  	int k = 0;
  
  	list_for_each_entry(pos, data->head, entries) {
  		if (pos->offset >= start && pos->offset < end) {
  			char header[4];
  
  			if (k < JUMP_NB) {
  				int key = '0' + (pos->index % JUMP_NB) + 1;
  
  				sprintf(header, "(%c)", key);
  				data->keys[k] = key;
  				data->targets[k] = pos->target;
  				k++;
  			} else {
  				sprintf(header, "   ");
  			}
  
  			memcpy(buf + pos->offset, header, sizeof(header) - 1);
  		}
  	}
  	data->keys[k] = 0;
  }
  
  static void search_conf(void)
  {
  	struct symbol **sym_arr;
  	struct gstr res;
  	struct gstr title;
  	char *dialog_input;
  	int dres, vscroll = 0, hscroll = 0;
  	bool again;
  	struct gstr sttext;
  	struct subtitle_part stpart;
  
  	title = str_new();
  	str_printf( &title, _("Enter (sub)string or regexp to search for "
  			      "(with or without \"%s\")"), CONFIG_);
  
  again:
  	dialog_clear();
  	dres = dialog_inputbox(_("Search Configuration Parameter"),
  			      str_get(&title),
  			      10, 75, "");
  	switch (dres) {
  	case 0:
  		break;
  	case 1:
  		show_helptext(_("Search Configuration"), search_help);
  		goto again;
  	default:
  		str_free(&title);
  		return;
  	}
  
  	/* strip the prefix if necessary */
  	dialog_input = dialog_input_result;
  	if (strncasecmp(dialog_input_result, CONFIG_, strlen(CONFIG_)) == 0)
  		dialog_input += strlen(CONFIG_);
  
  	sttext = str_new();
  	str_printf(&sttext, "Search (%s)", dialog_input_result);
  	stpart.text = str_get(&sttext);
  	list_add_tail(&stpart.entries, &trail);
  
  	sym_arr = sym_re_search(dialog_input);
  	do {
  		LIST_HEAD(head);
  		struct menu *targets[JUMP_NB];
  		int keys[JUMP_NB + 1], i;
  		struct search_data data = {
  			.head = &head,
  			.targets = targets,
  			.keys = keys,
  		};
  		struct jump_key *pos, *tmp;
  
  		res = get_relations_str(sym_arr, &head);
  		set_subtitle();
  		dres = show_textbox_ext(_("Search Results"), (char *)
  					str_get(&res), 0, 0, keys, &vscroll,
  					&hscroll, &update_text, (void *)
  					&data);
  		again = false;
  		for (i = 0; i < JUMP_NB && keys[i]; i++)
  			if (dres == keys[i]) {
  				conf(targets[i]->parent, targets[i]);
  				again = true;
  			}
  		str_free(&res);
  		list_for_each_entry_safe(pos, tmp, &head, entries)
  			free(pos);
  	} while (again);
  	free(sym_arr);
  	str_free(&title);
  	list_del(trail.prev);
  	str_free(&sttext);
  }
  
  static void build_conf(struct menu *menu)
  {
  	struct symbol *sym;
  	struct property *prop;
  	struct menu *child;
  	int type, tmp, doint = 2;
  	tristate val;
  	char ch;
  	bool visible;
  
  	/*
  	 * note: menu_is_visible() has side effect that it will
  	 * recalc the value of the symbol.
  	 */
  	visible = menu_is_visible(menu);
  	if (show_all_options && !menu_has_prompt(menu))
  		return;
  	else if (!show_all_options && !visible)
  		return;
  
  	sym = menu->sym;
  	prop = menu->prompt;
  	if (!sym) {
  		if (prop && menu != current_menu) {
  			const char *prompt = menu_get_prompt(menu);
  			switch (prop->type) {
  			case P_MENU:
  				child_count++;
  				prompt = _(prompt);
  				if (single_menu_mode) {
  					item_make("%s%*c%s",
  						  menu->data ? "-->" : "++>",
  						  indent + 1, ' ', prompt);
  				} else
  					item_make("   %*c%s  %s",
  						  indent + 1, ' ', prompt,
  						  menu_is_empty(menu) ? "----" : "--->");
  				item_set_tag('m');
  				item_set_data(menu);
  				if (single_menu_mode && menu->data)
  					goto conf_childs;
  				return;
  			case P_COMMENT:
  				if (prompt) {
  					child_count++;
  					item_make("   %*c*** %s ***", indent + 1, ' ', _(prompt));
  					item_set_tag(':');
  					item_set_data(menu);
  				}
  				break;
  			default:
  				if (prompt) {
  					child_count++;
  					item_make("---%*c%s", indent + 1, ' ', _(prompt));
  					item_set_tag(':');
  					item_set_data(menu);
  				}
  			}
  		} else
  			doint = 0;
  		goto conf_childs;
  	}
  
  	type = sym_get_type(sym);
  	if (sym_is_choice(sym)) {
  		struct symbol *def_sym = sym_get_choice_value(sym);
  		struct menu *def_menu = NULL;
  
  		child_count++;
  		for (child = menu->list; child; child = child->next) {
  			if (menu_is_visible(child) && child->sym == def_sym)
  				def_menu = child;
  		}
  
  		val = sym_get_tristate_value(sym);
  		if (sym_is_changable(sym)) {
  			switch (type) {
  			case S_BOOLEAN:
  				item_make("[%c]", val == no ? ' ' : '*');
  				break;
  			case S_TRISTATE:
  				switch (val) {
  				case yes: ch = '*'; break;
  				case mod: ch = 'M'; break;
  				default:  ch = ' '; break;
  				}
  				item_make("<%c>", ch);
  				break;
  			}
  			item_set_tag('t');
  			item_set_data(menu);
  		} else {
  			item_make("   ");
  			item_set_tag(def_menu ? 't' : ':');
  			item_set_data(menu);
  		}
  
  		item_add_str("%*c%s", indent + 1, ' ', _(menu_get_prompt(menu)));
  		if (val == yes) {
  			if (def_menu) {
  				item_add_str(" (%s)", _(menu_get_prompt(def_menu)));
  				item_add_str("  --->");
  				if (def_menu->list) {
  					indent += 2;
  					build_conf(def_menu);
  					indent -= 2;
  				}
  			}
  			return;
  		}
  	} else {
  		if (menu == current_menu) {
  			item_make("---%*c%s", indent + 1, ' ', _(menu_get_prompt(menu)));
  			item_set_tag(':');
  			item_set_data(menu);
  			goto conf_childs;
  		}
  		child_count++;
  		val = sym_get_tristate_value(sym);
  		if (sym_is_choice_value(sym) && val == yes) {
  			item_make("   ");
  			item_set_tag(':');
  			item_set_data(menu);
  		} else {
  			switch (type) {
  			case S_BOOLEAN:
  				if (sym_is_changable(sym))
  					item_make("[%c]", val == no ? ' ' : '*');
  				else
  					item_make("-%c-", val == no ? ' ' : '*');
  				item_set_tag('t');
  				item_set_data(menu);
  				break;
  			case S_TRISTATE:
  				switch (val) {
  				case yes: ch = '*'; break;
  				case mod: ch = 'M'; break;
  				default:  ch = ' '; break;
  				}
  				if (sym_is_changable(sym)) {
  					if (sym->rev_dep.tri == mod)
  						item_make("{%c}", ch);
  					else
  						item_make("<%c>", ch);
  				} else
  					item_make("-%c-", ch);
  				item_set_tag('t');
  				item_set_data(menu);
  				break;
  			default:
  				tmp = 2 + strlen(sym_get_string_value(sym)); /* () = 2 */
  				item_make("(%s)", sym_get_string_value(sym));
  				tmp = indent - tmp + 4;
  				if (tmp < 0)
  					tmp = 0;
  				item_add_str("%*c%s%s", tmp, ' ', _(menu_get_prompt(menu)),
  					     (sym_has_value(sym) || !sym_is_changable(sym)) ?
  					     "" : _(" (NEW)"));
  				item_set_tag('s');
  				item_set_data(menu);
  				goto conf_childs;
  			}
  		}
  		item_add_str("%*c%s%s", indent + 1, ' ', _(menu_get_prompt(menu)),
  			  (sym_has_value(sym) || !sym_is_changable(sym)) ?
  			  "" : _(" (NEW)"));
  		if (menu->prompt->type == P_MENU) {
  			item_add_str("  %s", menu_is_empty(menu) ? "----" : "--->");
  			return;
  		}
  	}
  
  conf_childs:
  	indent += doint;
  	for (child = menu->list; child; child = child->next)
  		build_conf(child);
  	indent -= doint;
  }
  
  static void conf(struct menu *menu, struct menu *active_menu)
  {
  	struct menu *submenu;
  	const char *prompt = menu_get_prompt(menu);
  	struct subtitle_part stpart;
  	struct symbol *sym;
  	int res;
  	int s_scroll = 0;
  
  	if (menu != &rootmenu)
  		stpart.text = menu_get_prompt(menu);
  	else
  		stpart.text = NULL;
  	list_add_tail(&stpart.entries, &trail);
  
  	while (1) {
  		item_reset();
  		current_menu = menu;
  		build_conf(menu);
  		if (!child_count)
  			break;
  		set_subtitle();
  		dialog_clear();
  		res = dialog_menu(prompt ? _(prompt) : _("Main Menu"),
  				  _(menu_instructions),
  				  active_menu, &s_scroll);
  		if (res == 1 || res == KEY_ESC || res == -ERRDISPLAYTOOSMALL)
  			break;
  		if (item_count() != 0) {
  			if (!item_activate_selected())
  				continue;
  			if (!item_tag())
  				continue;
  		}
  		submenu = item_data();
  		active_menu = item_data();
  		if (submenu)
  			sym = submenu->sym;
  		else
  			sym = NULL;
  
  		switch (res) {
  		case 0:
  			switch (item_tag()) {
  			case 'm':
  				if (single_menu_mode)
  					submenu->data = (void *) (long) !submenu->data;
  				else
  					conf(submenu, NULL);
  				break;
  			case 't':
  				if (sym_is_choice(sym) && sym_get_tristate_value(sym) == yes)
  					conf_choice(submenu);
  				else if (submenu->prompt->type == P_MENU)
  					conf(submenu, NULL);
  				break;
  			case 's':
  				conf_string(submenu);
  				break;
  			}
  			break;
  		case 2:
  			if (sym)
  				show_help(submenu);
  			else {
  				reset_subtitle();
  				show_helptext(_("README"), _(mconf_readme));
  			}
  			break;
  		case 3:
  			reset_subtitle();
  			conf_save();
  			break;
  		case 4:
  			reset_subtitle();
  			conf_load();
  			break;
  		case 5:
  			if (item_is_tag('t')) {
  				if (sym_set_tristate_value(sym, yes))
  					break;
  				if (sym_set_tristate_value(sym, mod))
  					show_textbox(NULL, setmod_text, 6, 74);
  			}
  			break;
  		case 6:
  			if (item_is_tag('t'))
  				sym_set_tristate_value(sym, no);
  			break;
  		case 7:
  			if (item_is_tag('t'))
  				sym_set_tristate_value(sym, mod);
  			break;
  		case 8:
  			if (item_is_tag('t'))
  				sym_toggle_tristate_value(sym);
  			else if (item_is_tag('m'))
  				conf(submenu, NULL);
  			break;
  		case 9:
  			search_conf();
  			break;
  		case 10:
  			show_all_options = !show_all_options;
  			break;
  		}
  	}
  
  	list_del(trail.prev);
  }
  
  static int show_textbox_ext(const char *title, char *text, int r, int c, int
  			    *keys, int *vscroll, int *hscroll, update_text_fn
  			    update_text, void *data)
  {
  	dialog_clear();
  	return dialog_textbox(title, text, r, c, keys, vscroll, hscroll,
  			      update_text, data);
  }
  
  static void show_textbox(const char *title, const char *text, int r, int c)
  {
  	show_textbox_ext(title, (char *) text, r, c, (int []) {0}, NULL, NULL,
  			 NULL, NULL);
  }
  
  static void show_helptext(const char *title, const char *text)
  {
  	show_textbox(title, text, 0, 0);
  }
  
  static void conf_message_callback(const char *fmt, va_list ap)
  {
  	char buf[PATH_MAX+1];
  
  	vsnprintf(buf, sizeof(buf), fmt, ap);
  	if (save_and_exit)
  		printf("%s", buf);
  	else
  		show_textbox(NULL, buf, 6, 60);
  }
  
  static void show_help(struct menu *menu)
  {
  	struct gstr help = str_new();
  
  	help.max_width = getmaxx(stdscr) - 10;
  	menu_get_ext_help(menu, &help);
  
  	show_helptext(_(menu_get_prompt(menu)), str_get(&help));
  	str_free(&help);
  }
  
  static void conf_choice(struct menu *menu)
  {
  	const char *prompt = _(menu_get_prompt(menu));
  	struct menu *child;
  	struct symbol *active;
  
  	active = sym_get_choice_value(menu->sym);
  	while (1) {
  		int res;
  		int selected;
  		item_reset();
  
  		current_menu = menu;
  		for (child = menu->list; child; child = child->next) {
  			if (!menu_is_visible(child))
  				continue;
  			if (child->sym)
  				item_make("%s", _(menu_get_prompt(child)));
  			else {
  				item_make("*** %s ***", _(menu_get_prompt(child)));
  				item_set_tag(':');
  			}
  			item_set_data(child);
  			if (child->sym == active)
  				item_set_selected(1);
  			if (child->sym == sym_get_choice_value(menu->sym))
  				item_set_tag('X');
  		}
  		dialog_clear();
  		res = dialog_checklist(prompt ? _(prompt) : _("Main Menu"),
  					_(radiolist_instructions),
  					MENUBOX_HEIGTH_MIN,
  					MENUBOX_WIDTH_MIN,
  					CHECKLIST_HEIGTH_MIN);
  		selected = item_activate_selected();
  		switch (res) {
  		case 0:
  			if (selected) {
  				child = item_data();
  				if (!child->sym)
  					break;
  
  				sym_set_tristate_value(child->sym, yes);
  			}
  			return;
  		case 1:
  			if (selected) {
  				child = item_data();
  				show_help(child);
  				active = child->sym;
  			} else
  				show_help(menu);
  			break;
  		case KEY_ESC:
  			return;
  		case -ERRDISPLAYTOOSMALL:
  			return;
  		}
  	}
  }
  
  static void conf_string(struct menu *menu)
  {
  	const char *prompt = menu_get_prompt(menu);
  
  	while (1) {
  		int res;
  		const char *heading;
  
  		switch (sym_get_type(menu->sym)) {
  		case S_INT:
  			heading = _(inputbox_instructions_int);
  			break;
  		case S_HEX:
  			heading = _(inputbox_instructions_hex);
  			break;
  		case S_STRING:
  			heading = _(inputbox_instructions_string);
  			break;
  		default:
  			heading = _("Internal mconf error!");
  		}
  		dialog_clear();
  		res = dialog_inputbox(prompt ? _(prompt) : _("Main Menu"),
  				      heading, 10, 75,
  				      sym_get_string_value(menu->sym));
  		switch (res) {
  		case 0:
  			if (sym_set_string_value(menu->sym, dialog_input_result))
  				return;
  			show_textbox(NULL, _("You have made an invalid entry."), 5, 43);
  			break;
  		case 1:
  			show_help(menu);
  			break;
  		case KEY_ESC:
  			return;
  		}
  	}
  }
  
  static void conf_load(void)
  {
  
  	while (1) {
  		int res;
  		dialog_clear();
  		res = dialog_inputbox(NULL, load_config_text,
  				      11, 55, filename);
  		switch(res) {
  		case 0:
  			if (!dialog_input_result[0])
  				return;
  			if (!conf_read(dialog_input_result)) {
  				set_config_filename(dialog_input_result);
  				sym_set_change_count(1);
  				return;
  			}
  			show_textbox(NULL, _("File does not exist!"), 5, 38);
  			break;
  		case 1:
  			show_helptext(_("Load Alternate Configuration"), load_config_help);
  			break;
  		case KEY_ESC:
  			return;
  		}
  	}
  }
  
  static void conf_save(void)
  {
  	while (1) {
  		int res;
  		dialog_clear();
  		res = dialog_inputbox(NULL, save_config_text,
  				      11, 55, filename);
  		switch(res) {
  		case 0:
  			if (!dialog_input_result[0])
  				return;
  			if (!conf_write(dialog_input_result)) {
  				set_config_filename(dialog_input_result);
  				return;
  			}
  			show_textbox(NULL, _("Can't create file!  Probably a nonexistent directory."), 5, 60);
  			break;
  		case 1:
  			show_helptext(_("Save Alternate Configuration"), save_config_help);
  			break;
  		case KEY_ESC:
  			return;
  		}
  	}
  }
  
  static int handle_exit(void)
  {
  	int res;
  
  	save_and_exit = 1;
  	reset_subtitle();
  	dialog_clear();
  	if (conf_get_changed())
  		res = dialog_yesno(NULL,
  				   _("Do you wish to save your new configuration?
  "
  				     "(Press <ESC><ESC> to continue kernel configuration.)"),
  				   6, 60);
  	else
  		res = -1;
  
  	end_dialog(saved_x, saved_y);
  
  	switch (res) {
  	case 0:
  		if (conf_write(filename)) {
  			fprintf(stderr, _("
  
  "
  					  "Error while writing of the configuration.
  "
  					  "Your configuration changes were NOT saved."
  					  "
  
  "));
  			return 1;
  		}
  		/* fall through */
  	case -1:
  		printf(_("
  
  "
  			 "*** End of the configuration.
  "
  			 "*** Execute 'make' to start the build or try 'make help'."
  			 "
  
  "));
  		res = 0;
  		break;
  	default:
  		fprintf(stderr, _("
  
  "
  				  "Your configuration changes were NOT saved."
  				  "
  
  "));
  		if (res != KEY_ESC)
  			res = 0;
  	}
  
  	return res;
  }
  
  static void sig_handler(int signo)
  {
  	exit(handle_exit());
  }
  
  int main(int ac, char **av)
  {
  	char *mode;
  	int res;
  
  	setlocale(LC_ALL, "");
  	bindtextdomain(PACKAGE, LOCALEDIR);
  	textdomain(PACKAGE);
  
  	signal(SIGINT, sig_handler);
  
  	conf_parse(av[1]);
  	conf_read(NULL);
  
  	mode = getenv("MENUCONFIG_MODE");
  	if (mode) {
  		if (!strcasecmp(mode, "single_menu"))
  			single_menu_mode = 1;
  	}
  
  	if (init_dialog(NULL)) {
  		fprintf(stderr, N_("Your display is too small to run Menuconfig!
  "));
  		fprintf(stderr, N_("It must be at least 19 lines by 80 columns.
  "));
  		return 1;
  	}
  
  	set_config_filename(conf_get_configname());
  	conf_set_message_callback(conf_message_callback);
  	do {
  		conf(&rootmenu, NULL);
  		res = handle_exit();
  	} while (res == KEY_ESC);
  
  	return res;
  }