mconf.c

這是一個實時嵌入式作業系統 實作了MCS51 ARM等MCU

			switch (prop->type) {
			case P_MENU:
				child_count++;
				cmake();
				cprint_tag("m%p", menu);

				if (single_menu_mode) {
					cprint_name("%s%*c%s",
						menu->data ? "-->" : "++>",
						indent + 1, ' ', prompt);
				} else {
					cprint_name("   %*c%s  --->", indent + 1, ' ', prompt);
				}

				if (single_menu_mode && menu->data)
					goto conf_childs;
				return;
			default:
				if (prompt) {
					child_count++;
					cmake();
					cprint_tag(":%p", menu);
					cprint_name("---%*c%s", indent + 1, ' ', prompt);
				}
			}
		} else
			doint = 0;
		goto conf_childs;
	}

	cmake();
	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)) {
			cprint_tag("t%p", menu);
			switch (type) {
			case S_BOOLEAN:
				cprint_name("[%c]", val == no ? ' ' : '*');
				break;
			case S_TRISTATE:
				switch (val) {
				case yes: ch = '*'; break;
				case mod: ch = 'M'; break;
				default:  ch = ' '; break;
				}
				cprint_name("<%c>", ch);
				break;
			}
		} else {
			cprint_tag("%c%p", def_menu ? 't' : ':', menu);
			cprint_name("   ");
		}

		cprint_name("%*c%s", indent + 1, ' ', menu_get_prompt(menu));
		if (val == yes) {
			if (def_menu) {
				cprint_name(" (%s)", menu_get_prompt(def_menu));
				cprint_name("  --->");
				if (def_menu->list) {
					indent += 2;
					build_conf(def_menu);
					indent -= 2;
				}
			}
			return;
		}
	} else {
		if (menu == current_menu) {
			cprint_tag(":%p", menu);
			cprint_name("---%*c%s", indent + 1, ' ', menu_get_prompt(menu));
			goto conf_childs;
		}
		child_count++;
		val = sym_get_tristate_value(sym);
		if (sym_is_choice_value(sym) && val == yes) {
			cprint_tag(":%p", menu);
			cprint_name("   ");
		} else {
			switch (type) {
			case S_BOOLEAN:
				cprint_tag("t%p", menu);
				if (sym_is_changable(sym))
					cprint_name("[%c]", val == no ? ' ' : '*');
				else
					cprint_name("---");
				break;
			case S_TRISTATE:
				cprint_tag("t%p", menu);
				switch (val) {
				case yes: ch = '*'; break;
				case mod: ch = 'M'; break;
				default:  ch = ' '; break;
				}
				if (sym_is_changable(sym))
					cprint_name("<%c>", ch);
				else
					cprint_name("---");
				break;
			default:
				cprint_tag("s%p", menu);
				tmp = cprint_name("(%s)", sym_get_string_value(sym));
				tmp = indent - tmp + 4;
				if (tmp < 0)
					tmp = 0;
				cprint_name("%*c%s%s", tmp, ' ', menu_get_prompt(menu),
					(sym_has_value(sym) || !sym_is_changable(sym)) ?
					"" : " (NEW)");
				goto conf_childs;
			}
		}
		cprint_name("%*c%s%s", indent + 1, ' ', menu_get_prompt(menu),
			(sym_has_value(sym) || !sym_is_changable(sym)) ?
			"" : " (NEW)");
		if (menu->prompt->type == P_MENU) {
			cprint_name("  --->");
			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 dialog_list_item *active_item = NULL;
	struct menu *submenu;
	const char *prompt = menu_get_prompt(menu);
	struct symbol *sym;
	char active_entry[40];
	int stat, type;

	unlink("lxdialog.scrltmp");
	active_entry[0] = 0;
	while (1) {
		indent = 0;
		child_count = 0;
		current_menu = menu;
		cdone(); cinit();
		build_conf(menu);
		if (!child_count)
			break;
		if (menu == &rootmenu) {
			cmake(); cprint_tag(":"); cprint_name("--- ");
			cmake(); cprint_tag("L"); cprint_name("Load an Alternate Configuration File");
			cmake(); cprint_tag("S"); cprint_name("Save Configuration to an Alternate File");
		}
		dialog_clear();
		stat = dialog_menu(prompt ? prompt : "Main Menu",
				menu_instructions, rows, cols, rows - 10,
				active_entry, item_no, items);
		if (stat < 0)
			return;

		if (stat == 1 || stat == 255)
			break;

		active_item = first_sel_item(item_no, items);
		if (!active_item)
			continue;
		active_item->selected = 0;
		strncpy(active_entry, active_item->tag, sizeof(active_entry));
		active_entry[sizeof(active_entry)-1] = 0;
		type = active_entry[0];
		if (!type)
			continue;

		sym = NULL;
		submenu = NULL;
		if (sscanf(active_entry + 1, "%p", &submenu) == 1)
			sym = submenu->sym;

		switch (stat) {
		case 0:
			switch (type) {
			case 'm':
				if (single_menu_mode)
					submenu->data = (void *) (long) !submenu->data;
				else
					conf(submenu);
				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);
				break;
			case 's':
				conf_string(submenu);
				break;
			case 'L':
				conf_load();
				break;
			case 'S':
				conf_save();
				break;
			}
			break;
		case 2:
			if (sym)
				show_help(submenu);
			else
				show_helptext("README", mconf_readme);
			break;
		case 3:
			if (type == '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 4:
			if (type == 't')
				sym_set_tristate_value(sym, no);
			break;
		case 5:
			if (type == 't')
				sym_set_tristate_value(sym, mod);
			break;
		case 6:
			if (type == 't')
				sym_toggle_tristate_value(sym);
			else if (type == 'm')
				conf(submenu);
			break;
		case 7:
			search_conf();
			break;
		}
	}
}

static void show_textbox(const char *title, const char *text, int r, int c)
{
	int fd;

	fd = creat(".help.tmp", 0777);
	write(fd, text, strlen(text));
	close(fd);
	show_file(".help.tmp", title, r, c);
	unlink(".help.tmp");
}

static void show_helptext(const char *title, const char *text)
{
	show_textbox(title, text, 0, 0);
}

static void show_help(struct menu *menu)
{
	struct gstr help = str_new();
	struct symbol *sym = menu->sym;

	if (sym->help)
	{
		if (sym->name) {
			str_printf(&help, "%s:\n\n", sym->name);
			str_append(&help, sym->help);
			str_append(&help, "\n");
		}
	} else {
		str_append(&help, nohelp_text);
	}
	get_symbol_str(&help, sym);
	show_helptext(menu_get_prompt(menu), str_get(&help));
	str_free(&help);
}

static void show_file(const char *filename, const char *title, int r, int c)
{
	while (dialog_textbox(title, filename, r ? r : rows, c ? c : cols) < 0)
		;
}

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) {
		current_menu = menu;
		cdone(); cinit();
		for (child = menu->list; child; child = child->next) {
			if (!menu_is_visible(child))
				continue;
			cmake();
			cprint_tag("%p", child);
			cprint_name("%s", menu_get_prompt(child));
			if (child->sym == sym_get_choice_value(menu->sym))
				items[item_no - 1]->selected = 1; /* ON */
			else if (child->sym == active)
				items[item_no - 1]->selected = 2; /* SELECTED */
			else
				items[item_no - 1]->selected = 0; /* OFF */
		}

		switch (dialog_checklist(prompt ? prompt : "Main Menu",
					radiolist_instructions, 15, 70, 6,
					item_no, items, FLAG_RADIO)) {
		case 0:
			if (sscanf(first_sel_item(item_no, items)->tag, "%p", &child) != 1)
				break;
			sym_set_tristate_value(child->sym, yes);
			return;
		case 1:
			if (sscanf(first_sel_item(item_no, items)->tag, "%p", &child) == 1) {
				show_help(child);
				active = child->sym;
			} else
				show_help(menu);
			break;
		case 255:
			return;
		}
	}
}

static void conf_string(struct menu *menu)
{
	const char *prompt = menu_get_prompt(menu);

	while (1) {
		char *heading;

		switch (sym_get_type(menu->sym)) {
		case S_INT:
			heading = (char *) inputbox_instructions_int;
			break;
		case S_HEX:
			heading = (char *) inputbox_instructions_hex;
			break;
		case S_STRING:
			heading = (char *) inputbox_instructions_string;
			break;
		default:
			heading = "Internal mconf error!";
			/* panic? */;
		}

		switch (dialog_inputbox(prompt ? prompt : "Main Menu",
					heading, 10, 75,
					sym_get_string_value(menu->sym))) {
		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 255:
			return;
		}
	}
}

static void conf_load(void)
{
	while (1) {
		switch (dialog_inputbox(NULL, load_config_text, 11, 55,
					filename)) {
		case 0:
			if (!dialog_input_result[0])
				return;
			if (!conf_read(dialog_input_result))
				return;
			show_textbox(NULL, "File does not exist!", 5, 38);
			break;
		case 1:
			show_helptext("Load Alternate Configuration", load_config_help);
			break;
		case 255:
			return;
		}
	}
}

static void conf_save(void)
{
	while (1) {
		switch (dialog_inputbox(NULL, save_config_text, 11, 55,
					filename)) {
		case 0:
			if (!dialog_input_result[0])
				return;
			if (!conf_write(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 255:
			return;
		}
	}
}

static void conf_cleanup(void)
{
	tcsetattr(1, TCSAFLUSH, &ios_org);
	unlink(".help.tmp");
}

static void winch_handler(int sig)
{
	struct winsize ws;

	if (ioctl(1, TIOCGWINSZ, &ws) == -1) {
		rows = 24;
		cols = 80;
	} else {
		rows = ws.ws_row;
		cols = ws.ws_col;
	}

	if (rows < 19 || cols < 80) {
		end_dialog();
		fprintf(stderr, "Your display is too small to run Menuconfig!\n");
		fprintf(stderr, "It must be at least 19 lines by 80 columns.\n");
		exit(1);
	}

	rows -= 4;
	cols -= 5;

}

int main(int ac, char **av)
{
	char *mode;
	int stat;

	conf_parse(av[1]);
	conf_read(NULL);

	snprintf(menu_backtitle, 128, "Buildroot Configuration");

	mode = getenv("MENUCONFIG_MODE");
	if (mode) {
		if (!strcasecmp(mode, "single_menu"))
			single_menu_mode = 1;
	}

	tcgetattr(1, &ios_org);
	atexit(conf_cleanup);
	init_wsize();
	init_dialog();
	signal(SIGWINCH, winch_handler);
	conf(&rootmenu);
	end_dialog();

	/* Restart dialog to act more like when lxdialog was still separate */
	init_dialog();
	do {
		stat = dialog_yesno(NULL,
				    "Do you wish to save your new Buildroot configuration?", 5, 60);
	} while (stat < 0);
	end_dialog();

	if (stat == 0) {
		conf_write(NULL);
		printf("\n\n"
			"*** End of Buildroot configuration.\n"
			"*** Check the top-level Makefile for additional configuration options.\n\n");
	} else
		printf("\n\nYour Buildroot configuration changes were NOT saved.\n\n");

	return 0;
}