NJU-ProjectN/nemu ics2023 initialized

NJU-ProjectN/nemu eb63cf3568dbf4e0c3c6ef462e6ec685550fabbc Merge pull request #76 from rijuyuezhu/master

nemu/tools/kconfig/.gitignore

@@ -0,0 +1,3 @@
+build/
+!lexer.l
+!parser.y

nemu/tools/kconfig/Makefile

@@ -0,0 +1,40 @@
+NAME = conf
+obj := build
+SRCS += confdata.c expr.c preprocess.c symbol.c util.c
+SRCS += $(obj)/lexer.lex.c $(obj)/parser.tab.c
+CC = gcc
+CFLAGS += -DYYDEBUG
+INC_PATH += .
+DISTRO = $(shell cat /etc/os-release | grep PRETTY_NAME | sed 's/PRETTY_NAME=//')
+
+ifeq ($(DISTRO),"Gentoo Linux")
+LIBS += -ltinfo
+endif
+
+ifeq ($(NAME),conf)
+SRCS += conf.c
+else ifeq ($(NAME),mconf)
+SRCS += mconf.c $(shell find lxdialog/ -name "*.c")
+LIBS += -lncurses
+else
+$(error bad target=$(NAME))
+endif
+
+include $(NEMU_HOME)/scripts/build.mk
+
+$(obj)/lexer.lex.o: $(obj)/parser.tab.h
+$(obj)/lexer.lex.c: lexer.l $(obj)/parser.tab.h
+	@echo + LEX $@
+	@flex -o $@ $<
+
+$(obj)/parser.tab.c $(obj)/parser.tab.h: parser.y
+	@echo + YACC $@
+	@bison -v $< --defines=$(obj)/parser.tab.h -o $(obj)/parser.tab.c
+
+conf:
+	@$(MAKE) -s
+
+mconf:
+	@$(MAKE) -s NAME=mconf
+
+.PHONY: conf mconf

nemu/tools/kconfig/conf.c

@@ -0,0 +1,727 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
+ */
+
+#include <ctype.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <getopt.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <errno.h>
+
+#include "lkc.h"
+
+static void conf(struct menu *menu);
+static void check_conf(struct menu *menu);
+
+enum input_mode {
+	oldaskconfig,
+	syncconfig,
+	oldconfig,
+	allnoconfig,
+	allyesconfig,
+	allmodconfig,
+	alldefconfig,
+	randconfig,
+	defconfig,
+	savedefconfig,
+	listnewconfig,
+	helpnewconfig,
+	olddefconfig,
+	yes2modconfig,
+	mod2yesconfig,
+};
+static enum input_mode input_mode = oldaskconfig;
+
+static int indent = 1;
+static int tty_stdio;
+static int sync_kconfig;
+static int conf_cnt;
+static char line[PATH_MAX];
+static struct menu *rootEntry;
+
+static void print_help(struct menu *menu)
+{
+	struct gstr help = str_new();
+
+	menu_get_ext_help(menu, &help);
+
+	printf("\n%s\n", str_get(&help));
+	str_free(&help);
+}
+
+static void strip(char *str)
+{
+	char *p = str;
+	int l;
+
+	while ((isspace(*p)))
+		p++;
+	l = strlen(p);
+	if (p != str)
+		memmove(str, p, l + 1);
+	if (!l)
+		return;
+	p = str + l - 1;
+	while ((isspace(*p)))
+		*p-- = 0;
+}
+
+/* Helper function to facilitate fgets() by Jean Sacren. */
+static void xfgets(char *str, int size, FILE *in)
+{
+	if (!fgets(str, size, in))
+		fprintf(stderr, "\nError in reading or end of file.\n");
+
+	if (!tty_stdio)
+		printf("%s", str);
+}
+
+static int conf_askvalue(struct symbol *sym, const char *def)
+{
+	enum symbol_type type = sym_get_type(sym);
+
+	if (!sym_has_value(sym))
+		printf("(NEW) ");
+
+	line[0] = '\n';
+	line[1] = 0;
+
+	if (!sym_is_changeable(sym)) {
+		printf("%s\n", def);
+		line[0] = '\n';
+		line[1] = 0;
+		return 0;
+	}
+
+	switch (input_mode) {
+	case oldconfig:
+	case syncconfig:
+		if (sym_has_value(sym)) {
+			printf("%s\n", def);
+			return 0;
+		}
+		/* fall through */
+	case oldaskconfig:
+		fflush(stdout);
+		xfgets(line, sizeof(line), stdin);
+		return 1;
+	default:
+		break;
+	}
+
+	switch (type) {
+	case S_INT:
+	case S_HEX:
+	case S_STRING:
+		printf("%s\n", def);
+		return 1;
+	default:
+		;
+	}
+	printf("%s", line);
+	return 1;
+}
+
+static int conf_string(struct menu *menu)
+{
+	struct symbol *sym = menu->sym;
+	const char *def;
+
+	while (1) {
+		printf("%*s%s ", indent - 1, "", menu->prompt->text);
+		printf("(%s) ", sym->name);
+		def = sym_get_string_value(sym);
+		if (sym_get_string_value(sym))
+			printf("[%s] ", def);
+		if (!conf_askvalue(sym, def))
+			return 0;
+		switch (line[0]) {
+		case '\n':
+			break;
+		case '?':
+			/* print help */
+			if (line[1] == '\n') {
+				print_help(menu);
+				def = NULL;
+				break;
+			}
+			/* fall through */
+		default:
+			line[strlen(line)-1] = 0;
+			def = line;
+		}
+		if (def && sym_set_string_value(sym, def))
+			return 0;
+	}
+}
+
+static int conf_sym(struct menu *menu)
+{
+	struct symbol *sym = menu->sym;
+	tristate oldval, newval;
+
+	while (1) {
+		printf("%*s%s ", indent - 1, "", menu->prompt->text);
+		if (sym->name)
+			printf("(%s) ", sym->name);
+		putchar('[');
+		oldval = sym_get_tristate_value(sym);
+		switch (oldval) {
+		case no:
+			putchar('N');
+			break;
+		case mod:
+			putchar('M');
+			break;
+		case yes:
+			putchar('Y');
+			break;
+		}
+		if (oldval != no && sym_tristate_within_range(sym, no))
+			printf("/n");
+		if (oldval != mod && sym_tristate_within_range(sym, mod))
+			printf("/m");
+		if (oldval != yes && sym_tristate_within_range(sym, yes))
+			printf("/y");
+		printf("/?] ");
+		if (!conf_askvalue(sym, sym_get_string_value(sym)))
+			return 0;
+		strip(line);
+
+		switch (line[0]) {
+		case 'n':
+		case 'N':
+			newval = no;
+			if (!line[1] || !strcmp(&line[1], "o"))
+				break;
+			continue;
+		case 'm':
+		case 'M':
+			newval = mod;
+			if (!line[1])
+				break;
+			continue;
+		case 'y':
+		case 'Y':
+			newval = yes;
+			if (!line[1] || !strcmp(&line[1], "es"))
+				break;
+			continue;
+		case 0:
+			newval = oldval;
+			break;
+		case '?':
+			goto help;
+		default:
+			continue;
+		}
+		if (sym_set_tristate_value(sym, newval))
+			return 0;
+help:
+		print_help(menu);
+	}
+}
+
+static int conf_choice(struct menu *menu)
+{
+	struct symbol *sym, *def_sym;
+	struct menu *child;
+	bool is_new;
+
+	sym = menu->sym;
+	is_new = !sym_has_value(sym);
+	if (sym_is_changeable(sym)) {
+		conf_sym(menu);
+		sym_calc_value(sym);
+		switch (sym_get_tristate_value(sym)) {
+		case no:
+			return 1;
+		case mod:
+			return 0;
+		case yes:
+			break;
+		}
+	} else {
+		switch (sym_get_tristate_value(sym)) {
+		case no:
+			return 1;
+		case mod:
+			printf("%*s%s\n", indent - 1, "", menu_get_prompt(menu));
+			return 0;
+		case yes:
+			break;
+		}
+	}
+
+	while (1) {
+		int cnt, def;
+
+		printf("%*s%s\n", indent - 1, "", menu_get_prompt(menu));
+		def_sym = sym_get_choice_value(sym);
+		cnt = def = 0;
+		line[0] = 0;
+		for (child = menu->list; child; child = child->next) {
+			if (!menu_is_visible(child))
+				continue;
+			if (!child->sym) {
+				printf("%*c %s\n", indent, '*', menu_get_prompt(child));
+				continue;
+			}
+			cnt++;
+			if (child->sym == def_sym) {
+				def = cnt;
+				printf("%*c", indent, '>');
+			} else
+				printf("%*c", indent, ' ');
+			printf(" %d. %s", cnt, menu_get_prompt(child));
+			if (child->sym->name)
+				printf(" (%s)", child->sym->name);
+			if (!sym_has_value(child->sym))
+				printf(" (NEW)");
+			printf("\n");
+		}
+		printf("%*schoice", indent - 1, "");
+		if (cnt == 1) {
+			printf("[1]: 1\n");
+			goto conf_childs;
+		}
+		printf("[1-%d?]: ", cnt);
+		switch (input_mode) {
+		case oldconfig:
+		case syncconfig:
+			if (!is_new) {
+				cnt = def;
+				printf("%d\n", cnt);
+				break;
+			}
+			/* fall through */
+		case oldaskconfig:
+			fflush(stdout);
+			xfgets(line, sizeof(line), stdin);
+			strip(line);
+			if (line[0] == '?') {
+				print_help(menu);
+				continue;
+			}
+			if (!line[0])
+				cnt = def;
+			else if (isdigit(line[0]))
+				cnt = atoi(line);
+			else
+				continue;
+			break;
+		default:
+			break;
+		}
+
+	conf_childs:
+		for (child = menu->list; child; child = child->next) {
+			if (!child->sym || !menu_is_visible(child))
+				continue;
+			if (!--cnt)
+				break;
+		}
+		if (!child)
+			continue;
+		if (line[0] && line[strlen(line) - 1] == '?') {
+			print_help(child);
+			continue;
+		}
+		sym_set_choice_value(sym, child->sym);
+		for (child = child->list; child; child = child->next) {
+			indent += 2;
+			conf(child);
+			indent -= 2;
+		}
+		return 1;
+	}
+}
+
+static void conf(struct menu *menu)
+{
+	struct symbol *sym;
+	struct property *prop;
+	struct menu *child;
+
+	if (!menu_is_visible(menu))
+		return;
+
+	sym = menu->sym;
+	prop = menu->prompt;
+	if (prop) {
+		const char *prompt;
+
+		switch (prop->type) {
+		case P_MENU:
+			/*
+			 * Except in oldaskconfig mode, we show only menus that
+			 * contain new symbols.
+			 */
+			if (input_mode != oldaskconfig && rootEntry != menu) {
+				check_conf(menu);
+				return;
+			}
+			/* fall through */
+		case P_COMMENT:
+			prompt = menu_get_prompt(menu);
+			if (prompt)
+				printf("%*c\n%*c %s\n%*c\n",
+					indent, '*',
+					indent, '*', prompt,
+					indent, '*');
+		default:
+			;
+		}
+	}
+
+	if (!sym)
+		goto conf_childs;
+
+	if (sym_is_choice(sym)) {
+		conf_choice(menu);
+		if (sym->curr.tri != mod)
+			return;
+		goto conf_childs;
+	}
+
+	switch (sym->type) {
+	case S_INT:
+	case S_HEX:
+	case S_STRING:
+		conf_string(menu);
+		break;
+	default:
+		conf_sym(menu);
+		break;
+	}
+
+conf_childs:
+	if (sym)
+		indent += 2;
+	for (child = menu->list; child; child = child->next)
+		conf(child);
+	if (sym)
+		indent -= 2;
+}
+
+static void check_conf(struct menu *menu)
+{
+	struct symbol *sym;
+	struct menu *child;
+
+	if (!menu_is_visible(menu))
+		return;
+
+	sym = menu->sym;
+	if (sym && !sym_has_value(sym)) {
+		if (sym_is_changeable(sym) ||
+		    (sym_is_choice(sym) && sym_get_tristate_value(sym) == yes)) {
+			if (input_mode == listnewconfig) {
+				if (sym->name) {
+					const char *str;
+
+					if (sym->type == S_STRING) {
+						str = sym_get_string_value(sym);
+						str = sym_escape_string_value(str);
+						printf("%s%s=%s\n", CONFIG_, sym->name, str);
+						free((void *)str);
+					} else {
+						str = sym_get_string_value(sym);
+						printf("%s%s=%s\n", CONFIG_, sym->name, str);
+					}
+				}
+			} else if (input_mode == helpnewconfig) {
+				printf("-----\n");
+				print_help(menu);
+				printf("-----\n");
+
+			} else {
+				if (!conf_cnt++)
+					printf("*\n* Restart config...\n*\n");
+				rootEntry = menu_get_parent_menu(menu);
+				conf(rootEntry);
+			}
+		}
+	}
+
+	for (child = menu->list; child; child = child->next)
+		check_conf(child);
+}
+
+static struct option long_opts[] = {
+	{"oldaskconfig",    no_argument,       NULL, oldaskconfig},
+	{"oldconfig",       no_argument,       NULL, oldconfig},
+	{"syncconfig",      no_argument,       NULL, syncconfig},
+	{"defconfig",       required_argument, NULL, defconfig},
+	{"savedefconfig",   required_argument, NULL, savedefconfig},
+	{"allnoconfig",     no_argument,       NULL, allnoconfig},
+	{"allyesconfig",    no_argument,       NULL, allyesconfig},
+	{"allmodconfig",    no_argument,       NULL, allmodconfig},
+	{"alldefconfig",    no_argument,       NULL, alldefconfig},
+	{"randconfig",      no_argument,       NULL, randconfig},
+	{"listnewconfig",   no_argument,       NULL, listnewconfig},
+	{"helpnewconfig",   no_argument,       NULL, helpnewconfig},
+	{"olddefconfig",    no_argument,       NULL, olddefconfig},
+	{"yes2modconfig",   no_argument,       NULL, yes2modconfig},
+	{"mod2yesconfig",   no_argument,       NULL, mod2yesconfig},
+	{NULL, 0, NULL, 0}
+};
+
+static void conf_usage(const char *progname)
+{
+
+	printf("Usage: %s [-s] [option] <kconfig-file>\n", progname);
+	printf("[option] is _one_ of the following:\n");
+	printf("  --listnewconfig         List new options\n");
+	printf("  --helpnewconfig         List new options and help text\n");
+	printf("  --oldaskconfig          Start a new configuration using a line-oriented program\n");
+	printf("  --oldconfig             Update a configuration using a provided .config as base\n");
+	printf("  --syncconfig            Similar to oldconfig but generates configuration in\n"
+	       "                          include/{generated/,config/}\n");
+	printf("  --olddefconfig          Same as oldconfig but sets new symbols to their default value\n");
+	printf("  --defconfig <file>      New config with default defined in <file>\n");
+	printf("  --savedefconfig <file>  Save the minimal current configuration to <file>\n");
+	printf("  --allnoconfig           New config where all options are answered with no\n");
+	printf("  --allyesconfig          New config where all options are answered with yes\n");
+	printf("  --allmodconfig          New config where all options are answered with mod\n");
+	printf("  --alldefconfig          New config with all symbols set to default\n");
+	printf("  --randconfig            New config with random answer to all options\n");
+	printf("  --yes2modconfig         Change answers from yes to mod if possible\n");
+	printf("  --mod2yesconfig         Change answers from mod to yes if possible\n");
+}
+
+int main(int ac, char **av)
+{
+	const char *progname = av[0];
+	int opt;
+	const char *name, *defconfig_file = NULL /* gcc uninit */;
+	int no_conf_write = 0;
+
+	tty_stdio = isatty(0) && isatty(1);
+
+	while ((opt = getopt_long(ac, av, "s", long_opts, NULL)) != -1) {
+		if (opt == 's') {
+			conf_set_message_callback(NULL);
+			continue;
+		}
+		input_mode = (enum input_mode)opt;
+		switch (opt) {
+		case syncconfig:
+			/*
+			 * syncconfig is invoked during the build stage.
+			 * Suppress distracting "configuration written to ..."
+			 */
+			conf_set_message_callback(NULL);
+			sync_kconfig = 1;
+			break;
+		case defconfig:
+		case savedefconfig:
+			defconfig_file = optarg;
+			break;
+		case randconfig:
+		{
+			struct timeval now;
+			unsigned int seed;
+			char *seed_env;
+
+			/*
+			 * Use microseconds derived seed,
+			 * compensate for systems where it may be zero
+			 */
+			gettimeofday(&now, NULL);
+			seed = (unsigned int)((now.tv_sec + 1) * (now.tv_usec + 1));
+
+			seed_env = getenv("KCONFIG_SEED");
+			if( seed_env && *seed_env ) {
+				char *endp;
+				int tmp = (int)strtol(seed_env, &endp, 0);
+				if (*endp == '\0') {
+					seed = tmp;
+				}
+			}
+			fprintf( stderr, "KCONFIG_SEED=0x%X\n", seed );
+			srand(seed);
+			break;
+		}
+		case oldaskconfig:
+		case oldconfig:
+		case allnoconfig:
+		case allyesconfig:
+		case allmodconfig:
+		case alldefconfig:
+		case listnewconfig:
+		case helpnewconfig:
+		case olddefconfig:
+		case yes2modconfig:
+		case mod2yesconfig:
+			break;
+		case '?':
+			conf_usage(progname);
+			exit(1);
+			break;
+		}
+	}
+	if (ac == optind) {
+		fprintf(stderr, "%s: Kconfig file missing\n", av[0]);
+		conf_usage(progname);
+		exit(1);
+	}
+	name = av[optind];
+	conf_parse(name);
+	//zconfdump(stdout);
+
+	switch (input_mode) {
+	case defconfig:
+		if (conf_read(defconfig_file)) {
+			fprintf(stderr,
+				"***\n"
+				  "*** Can't find default configuration \"%s\"!\n"
+				  "***\n",
+				defconfig_file);
+			exit(1);
+		}
+		break;
+	case savedefconfig:
+	case syncconfig:
+	case oldaskconfig:
+	case oldconfig:
+	case listnewconfig:
+	case helpnewconfig:
+	case olddefconfig:
+	case yes2modconfig:
+	case mod2yesconfig:
+		conf_read(NULL);
+		break;
+	case allnoconfig:
+	case allyesconfig:
+	case allmodconfig:
+	case alldefconfig:
+	case randconfig:
+		name = getenv("KCONFIG_ALLCONFIG");
+		if (!name)
+			break;
+		if ((strcmp(name, "") != 0) && (strcmp(name, "1") != 0)) {
+			if (conf_read_simple(name, S_DEF_USER)) {
+				fprintf(stderr,
+					"*** Can't read seed configuration \"%s\"!\n",
+					name);
+				exit(1);
+			}
+			break;
+		}
+		switch (input_mode) {
+		case allnoconfig:	name = "allno.config"; break;
+		case allyesconfig:	name = "allyes.config"; break;
+		case allmodconfig:	name = "allmod.config"; break;
+		case alldefconfig:	name = "alldef.config"; break;
+		case randconfig:	name = "allrandom.config"; break;
+		default: break;
+		}
+		if (conf_read_simple(name, S_DEF_USER) &&
+		    conf_read_simple("all.config", S_DEF_USER)) {
+			fprintf(stderr,
+				"*** KCONFIG_ALLCONFIG set, but no \"%s\" or \"all.config\" file found\n",
+				name);
+			exit(1);
+		}
+		break;
+	default:
+		break;
+	}
+
+	if (sync_kconfig) {
+		name = getenv("KCONFIG_NOSILENTUPDATE");
+		if (name && *name) {
+			if (conf_get_changed()) {
+				fprintf(stderr,
+					"\n*** The configuration requires explicit update.\n\n");
+				return 1;
+			}
+			no_conf_write = 1;
+		}
+	}
+
+	switch (input_mode) {
+	case allnoconfig:
+		conf_set_all_new_symbols(def_no);
+		break;
+	case allyesconfig:
+		conf_set_all_new_symbols(def_yes);
+		break;
+	case allmodconfig:
+		conf_set_all_new_symbols(def_mod);
+		break;
+	case alldefconfig:
+		conf_set_all_new_symbols(def_default);
+		break;
+	case randconfig:
+		/* Really nothing to do in this loop */
+		while (conf_set_all_new_symbols(def_random)) ;
+		break;
+	case defconfig:
+		conf_set_all_new_symbols(def_default);
+		break;
+	case savedefconfig:
+		break;
+	case yes2modconfig:
+		conf_rewrite_mod_or_yes(def_y2m);
+		break;
+	case mod2yesconfig:
+		conf_rewrite_mod_or_yes(def_m2y);
+		break;
+	case oldaskconfig:
+		rootEntry = &rootmenu;
+		conf(&rootmenu);
+		input_mode = oldconfig;
+		/* fall through */
+	case oldconfig:
+	case listnewconfig:
+	case helpnewconfig:
+	case syncconfig:
+		/* Update until a loop caused no more changes */
+		do {
+			conf_cnt = 0;
+			check_conf(&rootmenu);
+		} while (conf_cnt);
+		break;
+	case olddefconfig:
+	default:
+		break;
+	}
+
+	if (input_mode == savedefconfig) {
+		if (conf_write_defconfig(defconfig_file)) {
+			fprintf(stderr, "n*** Error while saving defconfig to: %s\n\n",
+				defconfig_file);
+			return 1;
+		}
+	} else if (input_mode != listnewconfig && input_mode != helpnewconfig) {
+		if (!no_conf_write && conf_write(NULL)) {
+			fprintf(stderr, "\n*** Error during writing of the configuration.\n\n");
+			exit(1);
+		}
+
+		/*
+		 * Create auto.conf if it does not exist.
+		 * This prevents GNU Make 4.1 or older from emitting
+		 * "include/config/auto.conf: No such file or directory"
+		 * in the top-level Makefile
+		 *
+		 * syncconfig always creates or updates auto.conf because it is
+		 * used during the build.
+		 */
+		if (conf_write_autoconf(sync_kconfig) && sync_kconfig) {
+			fprintf(stderr,
+				"\n*** Error during sync of the configuration.\n\n");
+			return 1;
+		}
+	}
+	return 0;
+}

nemu/tools/kconfig/expr.h

@@ -0,0 +1,332 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
+ */
+
+#ifndef EXPR_H
+#define EXPR_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <assert.h>
+#include <stdio.h>
+#include "list.h"
+#ifndef __cplusplus
+#include <stdbool.h>
+#endif
+
+struct file {
+	struct file *next;
+	struct file *parent;
+	const char *name;
+	int lineno;
+};
+
+typedef enum tristate {
+	no, mod, yes
+} tristate;
+
+enum expr_type {
+	E_NONE, E_OR, E_AND, E_NOT,
+	E_EQUAL, E_UNEQUAL, E_LTH, E_LEQ, E_GTH, E_GEQ,
+	E_LIST, E_SYMBOL, E_RANGE
+};
+
+union expr_data {
+	struct expr *expr;
+	struct symbol *sym;
+};
+
+struct expr {
+	enum expr_type type;
+	union expr_data left, right;
+};
+
+#define EXPR_OR(dep1, dep2)	(((dep1)>(dep2))?(dep1):(dep2))
+#define EXPR_AND(dep1, dep2)	(((dep1)<(dep2))?(dep1):(dep2))
+#define EXPR_NOT(dep)		(2-(dep))
+
+#define expr_list_for_each_sym(l, e, s) \
+	for (e = (l); e && (s = e->right.sym); e = e->left.expr)
+
+struct expr_value {
+	struct expr *expr;
+	tristate tri;
+};
+
+struct symbol_value {
+	void *val;
+	tristate tri;
+};
+
+enum symbol_type {
+	S_UNKNOWN, S_BOOLEAN, S_TRISTATE, S_INT, S_HEX, S_STRING
+};
+
+/* enum values are used as index to symbol.def[] */
+enum {
+	S_DEF_USER,		/* main user value */
+	S_DEF_AUTO,		/* values read from auto.conf */
+	S_DEF_DEF3,		/* Reserved for UI usage */
+	S_DEF_DEF4,		/* Reserved for UI usage */
+	S_DEF_COUNT
+};
+
+/*
+ * Represents a configuration symbol.
+ *
+ * Choices are represented as a special kind of symbol and have the
+ * SYMBOL_CHOICE bit set in 'flags'.
+ */
+struct symbol {
+	/* The next symbol in the same bucket in the symbol hash table */
+	struct symbol *next;
+
+	/* The name of the symbol, e.g. "FOO" for 'config FOO' */
+	char *name;
+
+	/* S_BOOLEAN, S_TRISTATE, ... */
+	enum symbol_type type;
+
+	/*
+	 * The calculated value of the symbol. The SYMBOL_VALID bit is set in
+	 * 'flags' when this is up to date. Note that this value might differ
+	 * from the user value set in e.g. a .config file, due to visibility.
+	 */
+	struct symbol_value curr;
+
+	/*
+	 * Values for the symbol provided from outside. def[S_DEF_USER] holds
+	 * the .config value.
+	 */
+	struct symbol_value def[S_DEF_COUNT];
+
+	/*
+	 * An upper bound on the tristate value the user can set for the symbol
+	 * if it is a boolean or tristate. Calculated from prompt dependencies,
+	 * which also inherit dependencies from enclosing menus, choices, and
+	 * ifs. If 'n', the user value will be ignored.
+	 *
+	 * Symbols lacking prompts always have visibility 'n'.
+	 */
+	tristate visible;
+
+	/* SYMBOL_* flags */
+	int flags;
+
+	/* List of properties. See prop_type. */
+	struct property *prop;
+
+	/* Dependencies from enclosing menus, choices, and ifs */
+	struct expr_value dir_dep;
+
+	/* Reverse dependencies through being selected by other symbols */
+	struct expr_value rev_dep;
+
+	/*
+	 * "Weak" reverse dependencies through being implied by other symbols
+	 */
+	struct expr_value implied;
+};
+
+#define for_all_symbols(i, sym) for (i = 0; i < SYMBOL_HASHSIZE; i++) for (sym = symbol_hash[i]; sym; sym = sym->next)
+
+#define SYMBOL_CONST      0x0001  /* symbol is const */
+#define SYMBOL_CHECK      0x0008  /* used during dependency checking */
+#define SYMBOL_CHOICE     0x0010  /* start of a choice block (null name) */
+#define SYMBOL_CHOICEVAL  0x0020  /* used as a value in a choice block */
+#define SYMBOL_VALID      0x0080  /* set when symbol.curr is calculated */
+#define SYMBOL_OPTIONAL   0x0100  /* choice is optional - values can be 'n' */
+#define SYMBOL_WRITE      0x0200  /* write symbol to file (KCONFIG_CONFIG) */
+#define SYMBOL_CHANGED    0x0400  /* ? */
+#define SYMBOL_WRITTEN    0x0800  /* track info to avoid double-write to .config */
+#define SYMBOL_NO_WRITE   0x1000  /* Symbol for internal use only; it will not be written */
+#define SYMBOL_CHECKED    0x2000  /* used during dependency checking */
+#define SYMBOL_WARNED     0x8000  /* warning has been issued */
+
+/* Set when symbol.def[] is used */
+#define SYMBOL_DEF        0x10000  /* First bit of SYMBOL_DEF */
+#define SYMBOL_DEF_USER   0x10000  /* symbol.def[S_DEF_USER] is valid */
+#define SYMBOL_DEF_AUTO   0x20000  /* symbol.def[S_DEF_AUTO] is valid */
+#define SYMBOL_DEF3       0x40000  /* symbol.def[S_DEF_3] is valid */
+#define SYMBOL_DEF4       0x80000  /* symbol.def[S_DEF_4] is valid */
+
+/* choice values need to be set before calculating this symbol value */
+#define SYMBOL_NEED_SET_CHOICE_VALUES  0x100000
+
+/* Set symbol to y if allnoconfig; used for symbols that hide others */
+#define SYMBOL_ALLNOCONFIG_Y 0x200000
+
+#define SYMBOL_MAXLENGTH	256
+#define SYMBOL_HASHSIZE		9973
+
+/* A property represent the config options that can be associated
+ * with a config "symbol".
+ * Sample:
+ * config FOO
+ *         default y
+ *         prompt "foo prompt"
+ *         select BAR
+ * config BAZ
+ *         int "BAZ Value"
+ *         range 1..255
+ *
+ * Please, also check parser.y:print_symbol() when modifying the
+ * list of property types!
+ */
+enum prop_type {
+	P_UNKNOWN,
+	P_PROMPT,   /* prompt "foo prompt" or "BAZ Value" */
+	P_COMMENT,  /* text associated with a comment */
+	P_MENU,     /* prompt associated with a menu or menuconfig symbol */
+	P_DEFAULT,  /* default y */
+	P_CHOICE,   /* choice value */
+	P_SELECT,   /* select BAR */
+	P_IMPLY,    /* imply BAR */
+	P_RANGE,    /* range 7..100 (for a symbol) */
+	P_SYMBOL,   /* where a symbol is defined */
+};
+
+struct property {
+	struct property *next;     /* next property - null if last */
+	enum prop_type type;       /* type of property */
+	const char *text;          /* the prompt value - P_PROMPT, P_MENU, P_COMMENT */
+	struct expr_value visible;
+	struct expr *expr;         /* the optional conditional part of the property */
+	struct menu *menu;         /* the menu the property are associated with
+	                            * valid for: P_SELECT, P_RANGE, P_CHOICE,
+	                            * P_PROMPT, P_DEFAULT, P_MENU, P_COMMENT */
+	struct file *file;         /* what file was this property defined */
+	int lineno;                /* what lineno was this property defined */
+};
+
+#define for_all_properties(sym, st, tok) \
+	for (st = sym->prop; st; st = st->next) \
+		if (st->type == (tok))
+#define for_all_defaults(sym, st) for_all_properties(sym, st, P_DEFAULT)
+#define for_all_choices(sym, st) for_all_properties(sym, st, P_CHOICE)
+#define for_all_prompts(sym, st) \
+	for (st = sym->prop; st; st = st->next) \
+		if (st->text)
+
+/*
+ * Represents a node in the menu tree, as seen in e.g. menuconfig (though used
+ * for all front ends). Each symbol, menu, etc. defined in the Kconfig files
+ * gets a node. A symbol defined in multiple locations gets one node at each
+ * location.
+ */
+struct menu {
+	/* The next menu node at the same level */
+	struct menu *next;
+
+	/* The parent menu node, corresponding to e.g. a menu or choice */
+	struct menu *parent;
+
+	/* The first child menu node, for e.g. menus and choices */
+	struct menu *list;
+
+	/*
+	 * The symbol associated with the menu node. Choices are implemented as
+	 * a special kind of symbol. NULL for menus, comments, and ifs.
+	 */
+	struct symbol *sym;
+
+	/*
+	 * The prompt associated with the node. This holds the prompt for a
+	 * symbol as well as the text for a menu or comment, along with the
+	 * type (P_PROMPT, P_MENU, etc.)
+	 */
+	struct property *prompt;
+
+	/*
+	 * 'visible if' dependencies. If more than one is given, they will be
+	 * ANDed together.
+	 */
+	struct expr *visibility;
+
+	/*
+	 * Ordinary dependencies from e.g. 'depends on' and 'if', ANDed
+	 * together
+	 */
+	struct expr *dep;
+
+	/* MENU_* flags */
+	unsigned int flags;
+
+	/* Any help text associated with the node */
+	char *help;
+
+	/* The location where the menu node appears in the Kconfig files */
+	struct file *file;
+	int lineno;
+
+	/* For use by front ends that need to store auxiliary data */
+	void *data;
+};
+
+/*
+ * Set on a menu node when the corresponding symbol changes state in some way.
+ * Can be checked by front ends.
+ */
+#define MENU_CHANGED		0x0001
+
+#define MENU_ROOT		0x0002
+
+struct jump_key {
+	struct list_head entries;
+	size_t offset;
+	struct menu *target;
+	int index;
+};
+
+#define JUMP_NB			9
+
+extern struct file *file_list;
+extern struct file *current_file;
+struct file *lookup_file(const char *name);
+
+extern struct symbol symbol_yes, symbol_no, symbol_mod;
+extern struct symbol *modules_sym;
+extern struct symbol *sym_defconfig_list;
+extern int cdebug;
+struct expr *expr_alloc_symbol(struct symbol *sym);
+struct expr *expr_alloc_one(enum expr_type type, struct expr *ce);
+struct expr *expr_alloc_two(enum expr_type type, struct expr *e1, struct expr *e2);
+struct expr *expr_alloc_comp(enum expr_type type, struct symbol *s1, struct symbol *s2);
+struct expr *expr_alloc_and(struct expr *e1, struct expr *e2);
+struct expr *expr_alloc_or(struct expr *e1, struct expr *e2);
+struct expr *expr_copy(const struct expr *org);
+void expr_free(struct expr *e);
+void expr_eliminate_eq(struct expr **ep1, struct expr **ep2);
+int expr_eq(struct expr *e1, struct expr *e2);
+tristate expr_calc_value(struct expr *e);
+struct expr *expr_trans_bool(struct expr *e);
+struct expr *expr_eliminate_dups(struct expr *e);
+struct expr *expr_transform(struct expr *e);
+int expr_contains_symbol(struct expr *dep, struct symbol *sym);
+bool expr_depends_symbol(struct expr *dep, struct symbol *sym);
+struct expr *expr_trans_compare(struct expr *e, enum expr_type type, struct symbol *sym);
+
+void expr_fprint(struct expr *e, FILE *out);
+struct gstr; /* forward */
+void expr_gstr_print(struct expr *e, struct gstr *gs);
+void expr_gstr_print_revdep(struct expr *e, struct gstr *gs,
+			    tristate pr_type, const char *title);
+
+static inline int expr_is_yes(struct expr *e)
+{
+	return !e || (e->type == E_SYMBOL && e->left.sym == &symbol_yes);
+}
+
+static inline int expr_is_no(struct expr *e)
+{
+	return e && (e->type == E_SYMBOL && e->left.sym == &symbol_no);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* EXPR_H */

nemu/tools/kconfig/lexer.l

@@ -0,0 +1,471 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
+ */
+%option nostdinit noyywrap never-interactive full ecs
+%option 8bit nodefault yylineno
+%x ASSIGN_VAL HELP STRING
+%{
+
+#include <assert.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "lkc.h"
+#include "parser.tab.h"
+
+#define YY_DECL		static int yylex1(void)
+
+#define START_STRSIZE	16
+
+static struct {
+	struct file *file;
+	int lineno;
+} current_pos;
+
+static int prev_prev_token = T_EOL;
+static int prev_token = T_EOL;
+static char *text;
+static int text_size, text_asize;
+
+struct buffer {
+	struct buffer *parent;
+	YY_BUFFER_STATE state;
+};
+
+static struct buffer *current_buf;
+
+static int last_ts, first_ts;
+
+static char *expand_token(const char *in, size_t n);
+static void append_expanded_string(const char *in);
+static void zconf_endhelp(void);
+static void zconf_endfile(void);
+
+static void new_string(void)
+{
+	text = xmalloc(START_STRSIZE);
+	text_asize = START_STRSIZE;
+	text_size = 0;
+	*text = 0;
+}
+
+static void append_string(const char *str, int size)
+{
+	int new_size = text_size + size + 1;
+	if (new_size > text_asize) {
+		new_size += START_STRSIZE - 1;
+		new_size &= -START_STRSIZE;
+		text = xrealloc(text, new_size);
+		text_asize = new_size;
+	}
+	memcpy(text + text_size, str, size);
+	text_size += size;
+	text[text_size] = 0;
+}
+
+static void alloc_string(const char *str, int size)
+{
+	text = xmalloc(size + 1);
+	memcpy(text, str, size);
+	text[size] = 0;
+}
+
+static void warn_ignored_character(char chr)
+{
+	fprintf(stderr,
+	        "%s:%d:warning: ignoring unsupported character '%c'\n",
+	        current_file->name, yylineno, chr);
+}
+%}
+
+n	[A-Za-z0-9_-]
+
+%%
+	int str = 0;
+	int ts, i;
+
+#.*			/* ignore comment */
+[ \t]*			/* whitespaces */
+\\\n			/* escaped new line */
+\n			return T_EOL;
+"allnoconfig_y"		return T_ALLNOCONFIG_Y;
+"bool"			return T_BOOL;
+"choice"		return T_CHOICE;
+"comment"		return T_COMMENT;
+"config"		return T_CONFIG;
+"def_bool"		return T_DEF_BOOL;
+"def_tristate"		return T_DEF_TRISTATE;
+"default"		return T_DEFAULT;
+"defconfig_list"	return T_DEFCONFIG_LIST;
+"depends"		return T_DEPENDS;
+"endchoice"		return T_ENDCHOICE;
+"endif"			return T_ENDIF;
+"endmenu"		return T_ENDMENU;
+"help"			return T_HELP;
+"hex"			return T_HEX;
+"if"			return T_IF;
+"imply"			return T_IMPLY;
+"int"			return T_INT;
+"mainmenu"		return T_MAINMENU;
+"menu"			return T_MENU;
+"menuconfig"		return T_MENUCONFIG;
+"modules"		return T_MODULES;
+"on"			return T_ON;
+"option"		return T_OPTION;
+"optional"		return T_OPTIONAL;
+"prompt"		return T_PROMPT;
+"range"			return T_RANGE;
+"select"		return T_SELECT;
+"source"		return T_SOURCE;
+"string"		return T_STRING;
+"tristate"		return T_TRISTATE;
+"visible"		return T_VISIBLE;
+"||"			return T_OR;
+"&&"			return T_AND;
+"="			return T_EQUAL;
+"!="			return T_UNEQUAL;
+"<"			return T_LESS;
+"<="			return T_LESS_EQUAL;
+">"			return T_GREATER;
+">="			return T_GREATER_EQUAL;
+"!"			return T_NOT;
+"("			return T_OPEN_PAREN;
+")"			return T_CLOSE_PAREN;
+":="			return T_COLON_EQUAL;
+"+="			return T_PLUS_EQUAL;
+\"|\'			{
+				str = yytext[0];
+				new_string();
+				BEGIN(STRING);
+			}
+{n}+			{
+				alloc_string(yytext, yyleng);
+				yylval.string = text;
+				return T_WORD;
+			}
+({n}|$)+		{
+				/* this token includes at least one '$' */
+				yylval.string = expand_token(yytext, yyleng);
+				if (strlen(yylval.string))
+					return T_WORD;
+				free(yylval.string);
+			}
+.			warn_ignored_character(*yytext);
+
+<ASSIGN_VAL>{
+	[^[:blank:]\n]+.*	{
+		alloc_string(yytext, yyleng);
+		yylval.string = text;
+		return T_ASSIGN_VAL;
+	}
+	\n	{ BEGIN(INITIAL); return T_EOL; }
+	.
+}
+
+<STRING>{
+	"$".*	append_expanded_string(yytext);
+	[^$'"\\\n]+	{
+		append_string(yytext, yyleng);
+	}
+	\\.?	{
+		append_string(yytext + 1, yyleng - 1);
+	}
+	\'|\"	{
+		if (str == yytext[0]) {
+			BEGIN(INITIAL);
+			yylval.string = text;
+			return T_WORD_QUOTE;
+		} else
+			append_string(yytext, 1);
+	}
+	\n	{
+		fprintf(stderr,
+			"%s:%d:warning: multi-line strings not supported\n",
+			zconf_curname(), zconf_lineno());
+		unput('\n');
+		BEGIN(INITIAL);
+		yylval.string = text;
+		return T_WORD_QUOTE;
+	}
+	<<EOF>>	{
+		BEGIN(INITIAL);
+		yylval.string = text;
+		return T_WORD_QUOTE;
+	}
+}
+
+<HELP>{
+	[ \t]+	{
+		ts = 0;
+		for (i = 0; i < yyleng; i++) {
+			if (yytext[i] == '\t')
+				ts = (ts & ~7) + 8;
+			else
+				ts++;
+		}
+		last_ts = ts;
+		if (first_ts) {
+			if (ts < first_ts) {
+				zconf_endhelp();
+				return T_HELPTEXT;
+			}
+			ts -= first_ts;
+			while (ts > 8) {
+				append_string("        ", 8);
+				ts -= 8;
+			}
+			append_string("        ", ts);
+		}
+	}
+	[ \t]*\n/[^ \t\n] {
+		zconf_endhelp();
+		return T_HELPTEXT;
+	}
+	[ \t]*\n	{
+		append_string("\n", 1);
+	}
+	[^ \t\n].* {
+		while (yyleng) {
+			if ((yytext[yyleng-1] != ' ') && (yytext[yyleng-1] != '\t'))
+				break;
+			yyleng--;
+		}
+		append_string(yytext, yyleng);
+		if (!first_ts)
+			first_ts = last_ts;
+	}
+	<<EOF>>	{
+		zconf_endhelp();
+		return T_HELPTEXT;
+	}
+}
+
+<<EOF>>	{
+	BEGIN(INITIAL);
+
+	if (prev_token != T_EOL && prev_token != T_HELPTEXT)
+		fprintf(stderr, "%s:%d:warning: no new line at end of file\n",
+			current_file->name, yylineno);
+
+	if (current_file) {
+		zconf_endfile();
+		return T_EOL;
+	}
+	fclose(yyin);
+	yyterminate();
+}
+
+%%
+
+/* second stage lexer */
+int yylex(void)
+{
+	int token;
+
+repeat:
+	token = yylex1();
+
+	if (prev_token == T_EOL || prev_token == T_HELPTEXT) {
+		if (token == T_EOL) {
+			/* Do not pass unneeded T_EOL to the parser. */
+			goto repeat;
+		} else {
+			/*
+			 * For the parser, update file/lineno at the first token
+			 * of each statement. Generally, \n is a statement
+			 * terminator in Kconfig, but it is not always true
+			 * because \n could be escaped by a backslash.
+			 */
+			current_pos.file = current_file;
+			current_pos.lineno = yylineno;
+		}
+	}
+
+	if (prev_prev_token == T_EOL && prev_token == T_WORD &&
+	    (token == T_EQUAL || token == T_COLON_EQUAL || token == T_PLUS_EQUAL))
+		BEGIN(ASSIGN_VAL);
+
+	prev_prev_token = prev_token;
+	prev_token = token;
+
+	return token;
+}
+
+static char *expand_token(const char *in, size_t n)
+{
+	char *out;
+	int c;
+	char c2;
+	const char *rest, *end;
+
+	new_string();
+	append_string(in, n);
+
+	/* get the whole line because we do not know the end of token. */
+	while ((c = input()) != EOF) {
+		if (c == '\n') {
+			unput(c);
+			break;
+		}
+		c2 = c;
+		append_string(&c2, 1);
+	}
+
+	rest = text;
+	out = expand_one_token(&rest);
+
+	/* push back unused characters to the input stream */
+	end = rest + strlen(rest);
+	while (end > rest)
+		unput(*--end);
+
+	free(text);
+
+	return out;
+}
+
+static void append_expanded_string(const char *str)
+{
+	const char *end;
+	char *res;
+
+	str++;
+
+	res = expand_dollar(&str);
+
+	/* push back unused characters to the input stream */
+	end = str + strlen(str);
+	while (end > str)
+		unput(*--end);
+
+	append_string(res, strlen(res));
+
+	free(res);
+}
+
+void zconf_starthelp(void)
+{
+	new_string();
+	last_ts = first_ts = 0;
+	BEGIN(HELP);
+}
+
+static void zconf_endhelp(void)
+{
+	yylval.string = text;
+	BEGIN(INITIAL);
+}
+
+
+/*
+ * Try to open specified file with following names:
+ * ./name
+ * $(srctree)/name
+ * The latter is used when srctree is separate from objtree
+ * when compiling the kernel.
+ * Return NULL if file is not found.
+ */
+FILE *zconf_fopen(const char *name)
+{
+	char *env, fullname[PATH_MAX+1];
+	FILE *f;
+
+	f = fopen(name, "r");
+	if (!f && name != NULL && name[0] != '/') {
+		env = getenv(SRCTREE);
+		if (env) {
+			snprintf(fullname, sizeof(fullname),
+				 "%s/%s", env, name);
+			f = fopen(fullname, "r");
+		}
+	}
+	return f;
+}
+
+void zconf_initscan(const char *name)
+{
+	yyin = zconf_fopen(name);
+	if (!yyin) {
+		fprintf(stderr, "can't find file %s\n", name);
+		exit(1);
+	}
+
+	current_buf = xmalloc(sizeof(*current_buf));
+	memset(current_buf, 0, sizeof(*current_buf));
+
+	current_file = file_lookup(name);
+	yylineno = 1;
+}
+
+void zconf_nextfile(const char *name)
+{
+	struct file *iter;
+	struct file *file = file_lookup(name);
+	struct buffer *buf = xmalloc(sizeof(*buf));
+	memset(buf, 0, sizeof(*buf));
+
+	current_buf->state = YY_CURRENT_BUFFER;
+	yyin = zconf_fopen(file->name);
+	if (!yyin) {
+		fprintf(stderr, "%s:%d: can't open file \"%s\"\n",
+			zconf_curname(), zconf_lineno(), file->name);
+		exit(1);
+	}
+	yy_switch_to_buffer(yy_create_buffer(yyin, YY_BUF_SIZE));
+	buf->parent = current_buf;
+	current_buf = buf;
+
+	current_file->lineno = yylineno;
+	file->parent = current_file;
+
+	for (iter = current_file; iter; iter = iter->parent) {
+		if (!strcmp(iter->name, file->name)) {
+			fprintf(stderr,
+				"Recursive inclusion detected.\n"
+				"Inclusion path:\n"
+				"  current file : %s\n", file->name);
+			iter = file;
+			do {
+				iter = iter->parent;
+				fprintf(stderr, "  included from: %s:%d\n",
+					iter->name, iter->lineno - 1);
+			} while (strcmp(iter->name, file->name));
+			exit(1);
+		}
+	}
+
+	yylineno = 1;
+	current_file = file;
+}
+
+static void zconf_endfile(void)
+{
+	struct buffer *parent;
+
+	current_file = current_file->parent;
+	if (current_file)
+		yylineno = current_file->lineno;
+
+	parent = current_buf->parent;
+	if (parent) {
+		fclose(yyin);
+		yy_delete_buffer(YY_CURRENT_BUFFER);
+		yy_switch_to_buffer(parent->state);
+	}
+	free(current_buf);
+	current_buf = parent;
+}
+
+int zconf_lineno(void)
+{
+	return current_pos.lineno;
+}
+
+const char *zconf_curname(void)
+{
+	return current_pos.file ? current_pos.file->name : "<none>";
+}

nemu/tools/kconfig/list.h

@@ -0,0 +1,132 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef LIST_H
+#define LIST_H
+
+/*
+ * Copied from include/linux/...
+ */
+
+#undef offsetof
+#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+
+/**
+ * container_of - cast a member of a structure out to the containing structure
+ * @ptr:        the pointer to the member.
+ * @type:       the type of the container struct this is embedded in.
+ * @member:     the name of the member within the struct.
+ *
+ */
+#define container_of(ptr, type, member) ({                      \
+	const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
+	(type *)( (char *)__mptr - offsetof(type,member) );})
+
+
+struct list_head {
+	struct list_head *next, *prev;
+};
+
+
+#define LIST_HEAD_INIT(name) { &(name), &(name) }
+
+#define LIST_HEAD(name) \
+	struct list_head name = LIST_HEAD_INIT(name)
+
+/**
+ * list_entry - get the struct for this entry
+ * @ptr:	the &struct list_head pointer.
+ * @type:	the type of the struct this is embedded in.
+ * @member:	the name of the list_head within the struct.
+ */
+#define list_entry(ptr, type, member) \
+	container_of(ptr, type, member)
+
+/**
+ * list_for_each_entry	-	iterate over list of given type
+ * @pos:	the type * to use as a loop cursor.
+ * @head:	the head for your list.
+ * @member:	the name of the list_head within the struct.
+ */
+#define list_for_each_entry(pos, head, member)				\
+	for (pos = list_entry((head)->next, typeof(*pos), member);	\
+	     &pos->member != (head); 	\
+	     pos = list_entry(pos->member.next, typeof(*pos), member))
+
+/**
+ * list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
+ * @pos:	the type * to use as a loop cursor.
+ * @n:		another type * to use as temporary storage
+ * @head:	the head for your list.
+ * @member:	the name of the list_head within the struct.
+ */
+#define list_for_each_entry_safe(pos, n, head, member)			\
+	for (pos = list_entry((head)->next, typeof(*pos), member),	\
+		n = list_entry(pos->member.next, typeof(*pos), member);	\
+	     &pos->member != (head);					\
+	     pos = n, n = list_entry(n->member.next, typeof(*n), member))
+
+/**
+ * list_empty - tests whether a list is empty
+ * @head: the list to test.
+ */
+static inline int list_empty(const struct list_head *head)
+{
+	return head->next == head;
+}
+
+/*
+ * Insert a new entry between two known consecutive entries.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static inline void __list_add(struct list_head *_new,
+			      struct list_head *prev,
+			      struct list_head *next)
+{
+	next->prev = _new;
+	_new->next = next;
+	_new->prev = prev;
+	prev->next = _new;
+}
+
+/**
+ * list_add_tail - add a new entry
+ * @new: new entry to be added
+ * @head: list head to add it before
+ *
+ * Insert a new entry before the specified head.
+ * This is useful for implementing queues.
+ */
+static inline void list_add_tail(struct list_head *_new, struct list_head *head)
+{
+	__list_add(_new, head->prev, head);
+}
+
+/*
+ * Delete a list entry by making the prev/next entries
+ * point to each other.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static inline void __list_del(struct list_head *prev, struct list_head *next)
+{
+	next->prev = prev;
+	prev->next = next;
+}
+
+#define LIST_POISON1  ((void *) 0x00100100)
+#define LIST_POISON2  ((void *) 0x00200200)
+/**
+ * list_del - deletes entry from list.
+ * @entry: the element to delete from the list.
+ * Note: list_empty() on entry does not return true after this, the entry is
+ * in an undefined state.
+ */
+static inline void list_del(struct list_head *entry)
+{
+	__list_del(entry->prev, entry->next);
+	entry->next = (struct list_head*)LIST_POISON1;
+	entry->prev = (struct list_head*)LIST_POISON2;
+}
+#endif

nemu/tools/kconfig/lkc.h

@@ -0,0 +1,173 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
+ */
+
+#ifndef LKC_H
+#define LKC_H
+
+#include "expr.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "lkc_proto.h"
+
+#define SRCTREE "srctree"
+
+#ifndef PACKAGE
+#define PACKAGE "linux"
+#endif
+
+#ifndef CONFIG_
+#define CONFIG_ "CONFIG_"
+#endif
+static inline const char *CONFIG_prefix(void)
+{
+	return getenv( "CONFIG_" ) ?: CONFIG_;
+}
+#undef CONFIG_
+#define CONFIG_ CONFIG_prefix()
+
+enum conf_def_mode {
+	def_default,
+	def_yes,
+	def_mod,
+	def_y2m,
+	def_m2y,
+	def_no,
+	def_random
+};
+
+extern int yylineno;
+void zconfdump(FILE *out);
+void zconf_starthelp(void);
+FILE *zconf_fopen(const char *name);
+void zconf_initscan(const char *name);
+void zconf_nextfile(const char *name);
+int zconf_lineno(void);
+const char *zconf_curname(void);
+
+/* confdata.c */
+const char *conf_get_configname(void);
+void sym_set_change_count(int count);
+void sym_add_change_count(int count);
+bool conf_set_all_new_symbols(enum conf_def_mode mode);
+void conf_rewrite_mod_or_yes(enum conf_def_mode mode);
+void set_all_choice_values(struct symbol *csym);
+
+/* confdata.c and expr.c */
+static inline void xfwrite(const void *str, size_t len, size_t count, FILE *out)
+{
+	assert(len != 0);
+
+	if (fwrite(str, len, count, out) != count)
+		fprintf(stderr, "Error in writing or end of file.\n");
+}
+
+/* util.c */
+struct file *file_lookup(const char *name);
+void *xmalloc(size_t size);
+void *xcalloc(size_t nmemb, size_t size);
+void *xrealloc(void *p, size_t size);
+char *xstrdup(const char *s);
+char *xstrndup(const char *s, size_t n);
+
+/* lexer.l */
+int yylex(void);
+
+struct gstr {
+	size_t len;
+	char  *s;
+	/*
+	* when max_width is not zero long lines in string s (if any) get
+	* wrapped not to exceed the max_width value
+	*/
+	int max_width;
+};
+struct gstr str_new(void);
+void str_free(struct gstr *gs);
+void str_append(struct gstr *gs, const char *s);
+void str_printf(struct gstr *gs, const char *fmt, ...);
+const char *str_get(struct gstr *gs);
+
+/* menu.c */
+void _menu_init(void);
+void menu_warn(struct menu *menu, const char *fmt, ...);
+struct menu *menu_add_menu(void);
+void menu_end_menu(void);
+void menu_add_entry(struct symbol *sym);
+void menu_add_dep(struct expr *dep);
+void menu_add_visibility(struct expr *dep);
+struct property *menu_add_prompt(enum prop_type type, char *prompt, struct expr *dep);
+void menu_add_expr(enum prop_type type, struct expr *expr, struct expr *dep);
+void menu_add_symbol(enum prop_type type, struct symbol *sym, struct expr *dep);
+void menu_add_option_modules(void);
+void menu_add_option_defconfig_list(void);
+void menu_add_option_allnoconfig_y(void);
+void menu_finalize(struct menu *parent);
+void menu_set_type(int type);
+
+extern struct menu rootmenu;
+
+bool menu_is_empty(struct menu *menu);
+bool menu_is_visible(struct menu *menu);
+bool menu_has_prompt(struct menu *menu);
+const char *menu_get_prompt(struct menu *menu);
+struct menu *menu_get_root_menu(struct menu *menu);
+struct menu *menu_get_parent_menu(struct menu *menu);
+bool menu_has_help(struct menu *menu);
+const char *menu_get_help(struct menu *menu);
+struct gstr get_relations_str(struct symbol **sym_arr, struct list_head *head);
+void menu_get_ext_help(struct menu *menu, struct gstr *help);
+
+/* symbol.c */
+void sym_clear_all_valid(void);
+struct symbol *sym_choice_default(struct symbol *sym);
+struct property *sym_get_range_prop(struct symbol *sym);
+const char *sym_get_string_default(struct symbol *sym);
+struct symbol *sym_check_deps(struct symbol *sym);
+struct symbol *prop_get_symbol(struct property *prop);
+
+static inline tristate sym_get_tristate_value(struct symbol *sym)
+{
+	return sym->curr.tri;
+}
+
+
+static inline struct symbol *sym_get_choice_value(struct symbol *sym)
+{
+	return (struct symbol *)sym->curr.val;
+}
+
+static inline bool sym_set_choice_value(struct symbol *ch, struct symbol *chval)
+{
+	return sym_set_tristate_value(chval, yes);
+}
+
+static inline bool sym_is_choice(struct symbol *sym)
+{
+	return sym->flags & SYMBOL_CHOICE ? true : false;
+}
+
+static inline bool sym_is_choice_value(struct symbol *sym)
+{
+	return sym->flags & SYMBOL_CHOICEVAL ? true : false;
+}
+
+static inline bool sym_is_optional(struct symbol *sym)
+{
+	return sym->flags & SYMBOL_OPTIONAL ? true : false;
+}
+
+static inline bool sym_has_value(struct symbol *sym)
+{
+	return sym->flags & SYMBOL_DEF_USER ? true : false;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LKC_H */

nemu/tools/kconfig/lkc_proto.h

@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#include <stdarg.h>
+
+/* confdata.c */
+void conf_parse(const char *name);
+int conf_read(const char *name);
+int conf_read_simple(const char *name, int);
+int conf_write_defconfig(const char *name);
+int conf_write(const char *name);
+int conf_write_autoconf(int overwrite);
+bool conf_get_changed(void);
+void conf_set_changed_callback(void (*fn)(void));
+void conf_set_message_callback(void (*fn)(const char *s));
+
+/* symbol.c */
+extern struct symbol * symbol_hash[SYMBOL_HASHSIZE];
+
+struct symbol * sym_lookup(const char *name, int flags);
+struct symbol * sym_find(const char *name);
+const char * sym_escape_string_value(const char *in);
+struct symbol ** sym_re_search(const char *pattern);
+const char * sym_type_name(enum symbol_type type);
+void sym_calc_value(struct symbol *sym);
+enum symbol_type sym_get_type(struct symbol *sym);
+bool sym_tristate_within_range(struct symbol *sym,tristate tri);
+bool sym_set_tristate_value(struct symbol *sym,tristate tri);
+tristate sym_toggle_tristate_value(struct symbol *sym);
+bool sym_string_valid(struct symbol *sym, const char *newval);
+bool sym_string_within_range(struct symbol *sym, const char *str);
+bool sym_set_string_value(struct symbol *sym, const char *newval);
+bool sym_is_changeable(struct symbol *sym);
+struct property * sym_get_choice_prop(struct symbol *sym);
+const char * sym_get_string_value(struct symbol *sym);
+
+const char * prop_get_type_name(enum prop_type type);
+
+/* preprocess.c */
+enum variable_flavor {
+	VAR_SIMPLE,
+	VAR_RECURSIVE,
+	VAR_APPEND,
+};
+void env_write_dep(FILE *f, const char *auto_conf_name);
+void variable_add(const char *name, const char *value,
+		  enum variable_flavor flavor);
+void variable_all_del(void);
+char *expand_dollar(const char **str);
+char *expand_one_token(const char **str);
+
+/* expr.c */
+void expr_print(struct expr *e, void (*fn)(void *, struct symbol *, const char *), void *data, int prevtoken);

nemu/tools/kconfig/lxdialog/checklist.c

@@ -0,0 +1,319 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  checklist.c -- implements the checklist box
+ *
+ *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
+ *     Stuart Herbert - S.Herbert@sheffield.ac.uk: radiolist extension
+ *     Alessandro Rubini - rubini@ipvvis.unipv.it: merged the two
+ *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
+ */
+
+#include "dialog.h"
+
+static int list_width, check_x, item_x;
+
+/*
+ * Print list item
+ */
+static void print_item(WINDOW * win, int choice, int selected)
+{
+	int i;
+	char *list_item = malloc(list_width + 1);
+
+	strncpy(list_item, item_str(), list_width - item_x);
+	list_item[list_width - item_x] = '\0';
+
+	/* Clear 'residue' of last item */
+	wattrset(win, dlg.menubox.atr);
+	wmove(win, choice, 0);
+	for (i = 0; i < list_width; i++)
+		waddch(win, ' ');
+
+	wmove(win, choice, check_x);
+	wattrset(win, selected ? dlg.check_selected.atr
+		 : dlg.check.atr);
+	if (!item_is_tag(':'))
+		wprintw(win, "(%c)", item_is_tag('X') ? 'X' : ' ');
+
+	wattrset(win, selected ? dlg.tag_selected.atr : dlg.tag.atr);
+	mvwaddch(win, choice, item_x, list_item[0]);
+	wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
+	waddstr(win, list_item + 1);
+	if (selected) {
+		wmove(win, choice, check_x + 1);
+		wrefresh(win);
+	}
+	free(list_item);
+}
+
+/*
+ * Print the scroll indicators.
+ */
+static void print_arrows(WINDOW * win, int choice, int item_no, int scroll,
+	     int y, int x, int height)
+{
+	wmove(win, y, x);
+
+	if (scroll > 0) {
+		wattrset(win, dlg.uarrow.atr);
+		waddch(win, ACS_UARROW);
+		waddstr(win, "(-)");
+	} else {
+		wattrset(win, dlg.menubox.atr);
+		waddch(win, ACS_HLINE);
+		waddch(win, ACS_HLINE);
+		waddch(win, ACS_HLINE);
+		waddch(win, ACS_HLINE);
+	}
+
+	y = y + height + 1;
+	wmove(win, y, x);
+
+	if ((height < item_no) && (scroll + choice < item_no - 1)) {
+		wattrset(win, dlg.darrow.atr);
+		waddch(win, ACS_DARROW);
+		waddstr(win, "(+)");
+	} else {
+		wattrset(win, dlg.menubox_border.atr);
+		waddch(win, ACS_HLINE);
+		waddch(win, ACS_HLINE);
+		waddch(win, ACS_HLINE);
+		waddch(win, ACS_HLINE);
+	}
+}
+
+/*
+ *  Display the termination buttons
+ */
+static void print_buttons(WINDOW * dialog, int height, int width, int selected)
+{
+	int x = width / 2 - 11;
+	int y = height - 2;
+
+	print_button(dialog, "Select", y, x, selected == 0);
+	print_button(dialog, " Help ", y, x + 14, selected == 1);
+
+	wmove(dialog, y, x + 1 + 14 * selected);
+	wrefresh(dialog);
+}
+
+/*
+ * Display a dialog box with a list of options that can be turned on or off
+ * in the style of radiolist (only one option turned on at a time).
+ */
+int dialog_checklist(const char *title, const char *prompt, int height,
+		     int width, int list_height)
+{
+	int i, x, y, box_x, box_y;
+	int key = 0, button = 0, choice = 0, scroll = 0, max_choice;
+	WINDOW *dialog, *list;
+
+	/* which item to highlight */
+	item_foreach() {
+		if (item_is_tag('X'))
+			choice = item_n();
+		if (item_is_selected()) {
+			choice = item_n();
+			break;
+		}
+	}
+
+do_resize:
+	if (getmaxy(stdscr) < (height + CHECKLIST_HEIGTH_MIN))
+		return -ERRDISPLAYTOOSMALL;
+	if (getmaxx(stdscr) < (width + CHECKLIST_WIDTH_MIN))
+		return -ERRDISPLAYTOOSMALL;
+
+	max_choice = MIN(list_height, item_count());
+
+	/* 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);
+
+	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);
+	waddch(dialog, ACS_RTEE);
+
+	print_title(dialog, title, width);
+
+	wattrset(dialog, dlg.dialog.atr);
+	print_autowrap(dialog, prompt, width - 2, 1, 3);
+
+	list_width = width - 6;
+	box_y = height - list_height - 5;
+	box_x = (width - list_width) / 2 - 1;
+
+	/* create new window for the list */
+	list = subwin(dialog, list_height, list_width, y + box_y + 1,
+		      x + box_x + 1);
+
+	keypad(list, TRUE);
+
+	/* draw a box around the list items */
+	draw_box(dialog, box_y, box_x, list_height + 2, list_width + 2,
+		 dlg.menubox_border.atr, dlg.menubox.atr);
+
+	/* Find length of longest item in order to center checklist */
+	check_x = 0;
+	item_foreach()
+		check_x = MAX(check_x, strlen(item_str()) + 4);
+	check_x = MIN(check_x, list_width);
+
+	check_x = (list_width - check_x) / 2;
+	item_x = check_x + 4;
+
+	if (choice >= list_height) {
+		scroll = choice - list_height + 1;
+		choice -= scroll;
+	}
+
+	/* Print the list */
+	for (i = 0; i < max_choice; i++) {
+		item_set(scroll + i);
+		print_item(list, i, i == choice);
+	}
+
+	print_arrows(dialog, choice, item_count(), scroll,
+		     box_y, box_x + check_x + 5, list_height);
+
+	print_buttons(dialog, height, width, 0);
+
+	wnoutrefresh(dialog);
+	wnoutrefresh(list);
+	doupdate();
+
+	while (key != KEY_ESC) {
+		key = wgetch(dialog);
+
+		for (i = 0; i < max_choice; i++) {
+			item_set(i + scroll);
+			if (toupper(key) == toupper(item_str()[0]))
+				break;
+		}
+
+		if (i < max_choice || key == KEY_UP || key == KEY_DOWN ||
+		    key == '+' || key == '-') {
+			if (key == KEY_UP || key == '-') {
+				if (!choice) {
+					if (!scroll)
+						continue;
+					/* Scroll list down */
+					if (list_height > 1) {
+						/* De-highlight current first item */
+						item_set(scroll);
+						print_item(list, 0, FALSE);
+						scrollok(list, TRUE);
+						wscrl(list, -1);
+						scrollok(list, FALSE);
+					}
+					scroll--;
+					item_set(scroll);
+					print_item(list, 0, TRUE);
+					print_arrows(dialog, choice, item_count(),
+						     scroll, box_y, box_x + check_x + 5, list_height);
+
+					wnoutrefresh(dialog);
+					wrefresh(list);
+
+					continue;	/* wait for another key press */
+				} else
+					i = choice - 1;
+			} else if (key == KEY_DOWN || key == '+') {
+				if (choice == max_choice - 1) {
+					if (scroll + choice >= item_count() - 1)
+						continue;
+					/* Scroll list up */
+					if (list_height > 1) {
+						/* De-highlight current last item before scrolling up */
+						item_set(scroll + max_choice - 1);
+						print_item(list,
+							    max_choice - 1,
+							    FALSE);
+						scrollok(list, TRUE);
+						wscrl(list, 1);
+						scrollok(list, FALSE);
+					}
+					scroll++;
+					item_set(scroll + max_choice - 1);
+					print_item(list, max_choice - 1, TRUE);
+
+					print_arrows(dialog, choice, item_count(),
+						     scroll, box_y, box_x + check_x + 5, list_height);
+
+					wnoutrefresh(dialog);
+					wrefresh(list);
+
+					continue;	/* wait for another key press */
+				} else
+					i = choice + 1;
+			}
+			if (i != choice) {
+				/* De-highlight current item */
+				item_set(scroll + choice);
+				print_item(list, choice, FALSE);
+				/* Highlight new item */
+				choice = i;
+				item_set(scroll + choice);
+				print_item(list, choice, TRUE);
+				wnoutrefresh(dialog);
+				wrefresh(list);
+			}
+			continue;	/* wait for another key press */
+		}
+		switch (key) {
+		case 'H':
+		case 'h':
+		case '?':
+			button = 1;
+			/* fall-through */
+		case 'S':
+		case 's':
+		case ' ':
+		case '\n':
+			item_foreach()
+				item_set_selected(0);
+			item_set(scroll + choice);
+			item_set_selected(1);
+			delwin(list);
+			delwin(dialog);
+			return button;
+		case TAB:
+		case KEY_LEFT:
+		case KEY_RIGHT:
+			button = ((key == KEY_LEFT ? --button : ++button) < 0)
+			    ? 1 : (button > 1 ? 0 : button);
+
+			print_buttons(dialog, height, width, button);
+			wrefresh(dialog);
+			break;
+		case 'X':
+		case 'x':
+			key = KEY_ESC;
+			break;
+		case KEY_ESC:
+			key = on_key_esc(dialog);
+			break;
+		case KEY_RESIZE:
+			delwin(list);
+			delwin(dialog);
+			on_key_resize();
+			goto do_resize;
+		}
+
+		/* Now, update everything... */
+		doupdate();
+	}
+	delwin(list);
+	delwin(dialog);
+	return key;		/* ESC pressed */
+}

nemu/tools/kconfig/lxdialog/dialog.h

@@ -0,0 +1,238 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ *  dialog.h -- common declarations for all dialog modules
+ *
+ *  AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
+ */
+
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+
+#ifdef __sun__
+#define CURS_MACROS
+#endif
+#include <ncurses.h>
+
+/*
+ * Colors in ncurses 1.9.9e do not work properly since foreground and
+ * background colors are OR'd rather than separately masked.  This version
+ * of dialog was hacked to work with ncurses 1.9.9e, making it incompatible
+ * with standard curses.  The simplest fix (to make this work with standard
+ * curses) uses the wbkgdset() function, not used in the original hack.
+ * Turn it off if we're building with 1.9.9e, since it just confuses things.
+ */
+#if defined(NCURSES_VERSION) && defined(_NEED_WRAP) && !defined(GCC_PRINTFLIKE)
+#define OLD_NCURSES 1
+#undef  wbkgdset
+#define wbkgdset(w,p)		/*nothing */
+#else
+#define OLD_NCURSES 0
+#endif
+
+#define TR(params) _tracef params
+
+#define KEY_ESC 27
+#define TAB 9
+#define MAX_LEN 2048
+#define BUF_SIZE (10*1024)
+#define MIN(x,y) (x < y ? x : y)
+#define MAX(x,y) (x > y ? x : y)
+
+#ifndef ACS_ULCORNER
+#define ACS_ULCORNER '+'
+#endif
+#ifndef ACS_LLCORNER
+#define ACS_LLCORNER '+'
+#endif
+#ifndef ACS_URCORNER
+#define ACS_URCORNER '+'
+#endif
+#ifndef ACS_LRCORNER
+#define ACS_LRCORNER '+'
+#endif
+#ifndef ACS_HLINE
+#define ACS_HLINE '-'
+#endif
+#ifndef ACS_VLINE
+#define ACS_VLINE '|'
+#endif
+#ifndef ACS_LTEE
+#define ACS_LTEE '+'
+#endif
+#ifndef ACS_RTEE
+#define ACS_RTEE '+'
+#endif
+#ifndef ACS_UARROW
+#define ACS_UARROW '^'
+#endif
+#ifndef ACS_DARROW
+#define ACS_DARROW 'v'
+#endif
+
+/* error return codes */
+#define ERRDISPLAYTOOSMALL (KEY_MAX + 1)
+
+/*
+ *   Color definitions
+ */
+struct dialog_color {
+	chtype atr;	/* Color attribute */
+	int fg;		/* foreground */
+	int bg;		/* background */
+	int hl;		/* highlight this item */
+};
+
+struct subtitle_list {
+	struct subtitle_list *next;
+	const char *text;
+};
+
+struct dialog_info {
+	const char *backtitle;
+	struct subtitle_list *subtitles;
+	struct dialog_color screen;
+	struct dialog_color shadow;
+	struct dialog_color dialog;
+	struct dialog_color title;
+	struct dialog_color border;
+	struct dialog_color button_active;
+	struct dialog_color button_inactive;
+	struct dialog_color button_key_active;
+	struct dialog_color button_key_inactive;
+	struct dialog_color button_label_active;
+	struct dialog_color button_label_inactive;
+	struct dialog_color inputbox;
+	struct dialog_color inputbox_border;
+	struct dialog_color searchbox;
+	struct dialog_color searchbox_title;
+	struct dialog_color searchbox_border;
+	struct dialog_color position_indicator;
+	struct dialog_color menubox;
+	struct dialog_color menubox_border;
+	struct dialog_color item;
+	struct dialog_color item_selected;
+	struct dialog_color tag;
+	struct dialog_color tag_selected;
+	struct dialog_color tag_key;
+	struct dialog_color tag_key_selected;
+	struct dialog_color check;
+	struct dialog_color check_selected;
+	struct dialog_color uarrow;
+	struct dialog_color darrow;
+};
+
+/*
+ * Global variables
+ */
+extern struct dialog_info dlg;
+extern char dialog_input_result[];
+extern int saved_x, saved_y;		/* Needed in signal handler in mconf.c */
+
+/*
+ * Function prototypes
+ */
+
+/* item list as used by checklist and menubox */
+void item_reset(void);
+void item_make(const char *fmt, ...);
+void item_add_str(const char *fmt, ...);
+void item_set_tag(char tag);
+void item_set_data(void *p);
+void item_set_selected(int val);
+int item_activate_selected(void);
+void *item_data(void);
+char item_tag(void);
+
+/* item list manipulation for lxdialog use */
+#define MAXITEMSTR 200
+struct dialog_item {
+	char str[MAXITEMSTR];	/* prompt displayed */
+	char tag;
+	void *data;	/* pointer to menu item - used by menubox+checklist */
+	int selected;	/* Set to 1 by dialog_*() function if selected. */
+};
+
+/* list of lialog_items */
+struct dialog_list {
+	struct dialog_item node;
+	struct dialog_list *next;
+};
+
+extern struct dialog_list *item_cur;
+extern struct dialog_list item_nil;
+extern struct dialog_list *item_head;
+
+int item_count(void);
+void item_set(int n);
+int item_n(void);
+const char *item_str(void);
+int item_is_selected(void);
+int item_is_tag(char tag);
+#define item_foreach() \
+	for (item_cur = item_head ? item_head: item_cur; \
+	     item_cur && (item_cur != &item_nil); item_cur = item_cur->next)
+
+/* generic key handlers */
+int on_key_esc(WINDOW *win);
+int on_key_resize(void);
+
+/* minimum (re)size values */
+#define CHECKLIST_HEIGTH_MIN 6	/* For dialog_checklist() */
+#define CHECKLIST_WIDTH_MIN 6
+#define INPUTBOX_HEIGTH_MIN 2	/* For dialog_inputbox() */
+#define INPUTBOX_WIDTH_MIN 2
+#define MENUBOX_HEIGTH_MIN 15	/* For dialog_menu() */
+#define MENUBOX_WIDTH_MIN 65
+#define TEXTBOX_HEIGTH_MIN 8	/* For dialog_textbox() */
+#define TEXTBOX_WIDTH_MIN 8
+#define YESNO_HEIGTH_MIN 4	/* For dialog_yesno() */
+#define YESNO_WIDTH_MIN 4
+#define WINDOW_HEIGTH_MIN 19	/* For init_dialog() */
+#define WINDOW_WIDTH_MIN 80
+
+int init_dialog(const char *backtitle);
+void set_dialog_backtitle(const char *backtitle);
+void set_dialog_subtitles(struct subtitle_list *subtitles);
+void end_dialog(int x, int y);
+void attr_clear(WINDOW * win, int height, int width, chtype attr);
+void dialog_clear(void);
+void print_autowrap(WINDOW * win, const char *prompt, int width, int y, int x);
+void print_button(WINDOW * win, const char *label, int y, int x, int selected);
+void print_title(WINDOW *dialog, const char *title, int width);
+void draw_box(WINDOW * win, int y, int x, int height, int width, chtype box,
+	      chtype border);
+void draw_shadow(WINDOW * win, int y, int x, int height, int width);
+
+int first_alpha(const char *string, const char *exempt);
+int dialog_yesno(const char *title, const char *prompt, int height, int width);
+int dialog_msgbox(const char *title, const char *prompt, int height,
+		  int width, int pause);
+
+
+typedef void (*update_text_fn)(char *buf, size_t start, size_t end, void
+			       *_data);
+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 dialog_menu(const char *title, const char *prompt,
+		const void *selected, int *s_scroll);
+int dialog_checklist(const char *title, const char *prompt, int height,
+		     int width, int list_height);
+int dialog_inputbox(const char *title, const char *prompt, int height,
+		    int width, const char *init);
+
+/*
+ * This is the base for fictitious keys, which activate
+ * the buttons.
+ *
+ * Mouse-generated keys are the following:
+ *   -- the first 32 are used as numbers, in addition to '0'-'9'
+ *   -- the lowercase are used to signal mouse-enter events (M_EVENT + 'o')
+ *   -- uppercase chars are used to invoke the button (M_EVENT + 'O')
+ */
+#define M_EVENT (KEY_MAX+1)

nemu/tools/kconfig/lxdialog/inputbox.c

@@ -0,0 +1,289 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  inputbox.c -- implements the input box
+ *
+ *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
+ *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
+ */
+
+#include "dialog.h"
+
+char dialog_input_result[MAX_LEN + 1];
+
+/*
+ *  Print the termination buttons
+ */
+static void print_buttons(WINDOW * dialog, int height, int width, int selected)
+{
+	int x = width / 2 - 11;
+	int y = height - 2;
+
+	print_button(dialog, "  Ok  ", y, x, selected == 0);
+	print_button(dialog, " Help ", y, x + 14, selected == 1);
+
+	wmove(dialog, y, x + 1 + 14 * selected);
+	wrefresh(dialog);
+}
+
+/*
+ * Display a dialog box for inputing a string
+ */
+int dialog_inputbox(const char *title, const char *prompt, int height, int width,
+		    const char *init)
+{
+	int i, x, y, box_y, box_x, box_width;
+	int input_x = 0, key = 0, button = -1;
+	int show_x, len, pos;
+	char *instr = dialog_input_result;
+	WINDOW *dialog;
+
+	if (!init)
+		instr[0] = '\0';
+	else
+		strcpy(instr, init);
+
+do_resize:
+	if (getmaxy(stdscr) <= (height - INPUTBOX_HEIGTH_MIN))
+		return -ERRDISPLAYTOOSMALL;
+	if (getmaxx(stdscr) <= (width - INPUTBOX_WIDTH_MIN))
+		return -ERRDISPLAYTOOSMALL;
+
+	/* 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);
+
+	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);
+	waddch(dialog, ACS_RTEE);
+
+	print_title(dialog, title, width);
+
+	wattrset(dialog, dlg.dialog.atr);
+	print_autowrap(dialog, prompt, width - 2, 1, 3);
+
+	/* Draw the input field box */
+	box_width = width - 6;
+	getyx(dialog, y, x);
+	box_y = y + 2;
+	box_x = (width - box_width) / 2;
+	draw_box(dialog, y + 1, box_x - 1, 3, box_width + 2,
+		 dlg.dialog.atr, dlg.border.atr);
+
+	print_buttons(dialog, height, width, 0);
+
+	/* Set up the initial value */
+	wmove(dialog, box_y, box_x);
+	wattrset(dialog, dlg.inputbox.atr);
+
+	len = strlen(instr);
+	pos = len;
+
+	if (len >= box_width) {
+		show_x = len - box_width + 1;
+		input_x = box_width - 1;
+		for (i = 0; i < box_width - 1; i++)
+			waddch(dialog, instr[show_x + i]);
+	} else {
+		show_x = 0;
+		input_x = len;
+		waddstr(dialog, instr);
+	}
+
+	wmove(dialog, box_y, box_x + input_x);
+
+	wrefresh(dialog);
+
+	while (key != KEY_ESC) {
+		key = wgetch(dialog);
+
+		if (button == -1) {	/* Input box selected */
+			switch (key) {
+			case TAB:
+			case KEY_UP:
+			case KEY_DOWN:
+				break;
+			case KEY_BACKSPACE:
+			case 8:   /* ^H */
+			case 127: /* ^? */
+				if (pos) {
+					wattrset(dialog, dlg.inputbox.atr);
+					if (input_x == 0) {
+						show_x--;
+					} else
+						input_x--;
+
+					if (pos < len) {
+						for (i = pos - 1; i < len; i++) {
+							instr[i] = instr[i+1];
+						}
+					}
+
+					pos--;
+					len--;
+					instr[len] = '\0';
+					wmove(dialog, box_y, box_x);
+					for (i = 0; i < box_width; i++) {
+						if (!instr[show_x + i]) {
+							waddch(dialog, ' ');
+							break;
+						}
+						waddch(dialog, instr[show_x + i]);
+					}
+					wmove(dialog, box_y, input_x + box_x);
+					wrefresh(dialog);
+				}
+				continue;
+			case KEY_LEFT:
+				if (pos > 0) {
+					if (input_x > 0) {
+						wmove(dialog, box_y, --input_x + box_x);
+					} else if (input_x == 0) {
+						show_x--;
+						wmove(dialog, box_y, box_x);
+						for (i = 0; i < box_width; i++) {
+							if (!instr[show_x + i]) {
+								waddch(dialog, ' ');
+								break;
+							}
+							waddch(dialog, instr[show_x + i]);
+						}
+						wmove(dialog, box_y, box_x);
+					}
+					pos--;
+				}
+				continue;
+			case KEY_RIGHT:
+				if (pos < len) {
+					if (input_x < box_width - 1) {
+						wmove(dialog, box_y, ++input_x + box_x);
+					} else if (input_x == box_width - 1) {
+						show_x++;
+						wmove(dialog, box_y, box_x);
+						for (i = 0; i < box_width; i++) {
+							if (!instr[show_x + i]) {
+								waddch(dialog, ' ');
+								break;
+							}
+							waddch(dialog, instr[show_x + i]);
+						}
+						wmove(dialog, box_y, input_x + box_x);
+					}
+					pos++;
+				}
+				continue;
+			default:
+				if (key < 0x100 && isprint(key)) {
+					if (len < MAX_LEN) {
+						wattrset(dialog, dlg.inputbox.atr);
+						if (pos < len) {
+							for (i = len; i > pos; i--)
+								instr[i] = instr[i-1];
+							instr[pos] = key;
+						} else {
+							instr[len] = key;
+						}
+						pos++;
+						len++;
+						instr[len] = '\0';
+
+						if (input_x == box_width - 1) {
+							show_x++;
+						} else {
+							input_x++;
+						}
+
+						wmove(dialog, box_y, box_x);
+						for (i = 0; i < box_width; i++) {
+							if (!instr[show_x + i]) {
+								waddch(dialog, ' ');
+								break;
+							}
+							waddch(dialog, instr[show_x + i]);
+						}
+						wmove(dialog, box_y, input_x + box_x);
+						wrefresh(dialog);
+					} else
+						flash();	/* Alarm user about overflow */
+					continue;
+				}
+			}
+		}
+		switch (key) {
+		case 'O':
+		case 'o':
+			delwin(dialog);
+			return 0;
+		case 'H':
+		case 'h':
+			delwin(dialog);
+			return 1;
+		case KEY_UP:
+		case KEY_LEFT:
+			switch (button) {
+			case -1:
+				button = 1;	/* Indicates "Help" button is selected */
+				print_buttons(dialog, height, width, 1);
+				break;
+			case 0:
+				button = -1;	/* Indicates input box is selected */
+				print_buttons(dialog, height, width, 0);
+				wmove(dialog, box_y, box_x + input_x);
+				wrefresh(dialog);
+				break;
+			case 1:
+				button = 0;	/* Indicates "OK" button is selected */
+				print_buttons(dialog, height, width, 0);
+				break;
+			}
+			break;
+		case TAB:
+		case KEY_DOWN:
+		case KEY_RIGHT:
+			switch (button) {
+			case -1:
+				button = 0;	/* Indicates "OK" button is selected */
+				print_buttons(dialog, height, width, 0);
+				break;
+			case 0:
+				button = 1;	/* Indicates "Help" button is selected */
+				print_buttons(dialog, height, width, 1);
+				break;
+			case 1:
+				button = -1;	/* Indicates input box is selected */
+				print_buttons(dialog, height, width, 0);
+				wmove(dialog, box_y, box_x + input_x);
+				wrefresh(dialog);
+				break;
+			}
+			break;
+		case ' ':
+		case '\n':
+			delwin(dialog);
+			return (button == -1 ? 0 : button);
+		case 'X':
+		case 'x':
+			key = KEY_ESC;
+			break;
+		case KEY_ESC:
+			key = on_key_esc(dialog);
+			break;
+		case KEY_RESIZE:
+			delwin(dialog);
+			on_key_resize();
+			goto do_resize;
+		}
+	}
+
+	delwin(dialog);
+	return KEY_ESC;		/* ESC pressed */
+}

nemu/tools/kconfig/lxdialog/menubox.c

@@ -0,0 +1,424 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  menubox.c -- implements the menu box
+ *
+ *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
+ *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcapw@cfw.com)
+ */
+
+/*
+ *  Changes by Clifford Wolf (god@clifford.at)
+ *
+ *  [ 1998-06-13 ]
+ *
+ *    *)  A bugfix for the Page-Down problem
+ *
+ *    *)  Formerly when I used Page Down and Page Up, the cursor would be set
+ *        to the first position in the menu box.  Now lxdialog is a bit
+ *        smarter and works more like other menu systems (just have a look at
+ *        it).
+ *
+ *    *)  Formerly if I selected something my scrolling would be broken because
+ *        lxdialog is re-invoked by the Menuconfig shell script, can't
+ *        remember the last scrolling position, and just sets it so that the
+ *        cursor is at the bottom of the box.  Now it writes the temporary file
+ *        lxdialog.scrltmp which contains this information. The file is
+ *        deleted by lxdialog if the user leaves a submenu or enters a new
+ *        one, but it would be nice if Menuconfig could make another "rm -f"
+ *        just to be sure.  Just try it out - you will recognise a difference!
+ *
+ *  [ 1998-06-14 ]
+ *
+ *    *)  Now lxdialog is crash-safe against broken "lxdialog.scrltmp" files
+ *        and menus change their size on the fly.
+ *
+ *    *)  If for some reason the last scrolling position is not saved by
+ *        lxdialog, it sets the scrolling so that the selected item is in the
+ *        middle of the menu box, not at the bottom.
+ *
+ * 02 January 1999, Michael Elizabeth Chastain (mec@shout.net)
+ * Reset 'scroll' to 0 if the value from lxdialog.scrltmp is bogus.
+ * This fixes a bug in Menuconfig where using ' ' to descend into menus
+ * would leave mis-synchronized lxdialog.scrltmp files lying around,
+ * fscanf would read in 'scroll', and eventually that value would get used.
+ */
+
+#include "dialog.h"
+
+static int menu_width, item_x;
+
+/*
+ * Print menu item
+ */
+static void do_print_item(WINDOW * win, const char *item, int line_y,
+			  int selected, int hotkey)
+{
+	int j;
+	char *menu_item = malloc(menu_width + 1);
+
+	strncpy(menu_item, item, menu_width - item_x);
+	menu_item[menu_width - item_x] = '\0';
+	j = first_alpha(menu_item, "YyNnMmHh");
+
+	/* Clear 'residue' of last item */
+	wattrset(win, dlg.menubox.atr);
+	wmove(win, line_y, 0);
+#if OLD_NCURSES
+	{
+		int i;
+		for (i = 0; i < menu_width; i++)
+			waddch(win, ' ');
+	}
+#else
+	wclrtoeol(win);
+#endif
+	wattrset(win, selected ? dlg.item_selected.atr : dlg.item.atr);
+	mvwaddstr(win, line_y, item_x, menu_item);
+	if (hotkey) {
+		wattrset(win, selected ? dlg.tag_key_selected.atr
+			 : dlg.tag_key.atr);
+		mvwaddch(win, line_y, item_x + j, menu_item[j]);
+	}
+	if (selected) {
+		wmove(win, line_y, item_x + 1);
+	}
+	free(menu_item);
+	wrefresh(win);
+}
+
+#define print_item(index, choice, selected)				\
+do {									\
+	item_set(index);						\
+	do_print_item(menu, item_str(), choice, selected, !item_is_tag(':')); \
+} while (0)
+
+/*
+ * Print the scroll indicators.
+ */
+static void print_arrows(WINDOW * win, int item_no, int scroll, int y, int x,
+			 int height)
+{
+	int cur_y, cur_x;
+
+	getyx(win, cur_y, cur_x);
+
+	wmove(win, y, x);
+
+	if (scroll > 0) {
+		wattrset(win, dlg.uarrow.atr);
+		waddch(win, ACS_UARROW);
+		waddstr(win, "(-)");
+	} else {
+		wattrset(win, dlg.menubox.atr);
+		waddch(win, ACS_HLINE);
+		waddch(win, ACS_HLINE);
+		waddch(win, ACS_HLINE);
+		waddch(win, ACS_HLINE);
+	}
+
+	y = y + height + 1;
+	wmove(win, y, x);
+	wrefresh(win);
+
+	if ((height < item_no) && (scroll + height < item_no)) {
+		wattrset(win, dlg.darrow.atr);
+		waddch(win, ACS_DARROW);
+		waddstr(win, "(+)");
+	} else {
+		wattrset(win, dlg.menubox_border.atr);
+		waddch(win, ACS_HLINE);
+		waddch(win, ACS_HLINE);
+		waddch(win, ACS_HLINE);
+		waddch(win, ACS_HLINE);
+	}
+
+	wmove(win, cur_y, cur_x);
+	wrefresh(win);
+}
+
+/*
+ * Display the termination buttons.
+ */
+static void print_buttons(WINDOW * win, int height, int width, int selected)
+{
+	int x = width / 2 - 28;
+	int y = height - 2;
+
+	print_button(win, "Select", y, x, selected == 0);
+	print_button(win, " Exit ", y, x + 12, selected == 1);
+	print_button(win, " Help ", y, x + 24, selected == 2);
+	print_button(win, " Save ", y, x + 36, selected == 3);
+	print_button(win, " Load ", y, x + 48, selected == 4);
+
+	wmove(win, y, x + 1 + 12 * selected);
+	wrefresh(win);
+}
+
+/* scroll up n lines (n may be negative) */
+static void do_scroll(WINDOW *win, int *scroll, int n)
+{
+	/* Scroll menu up */
+	scrollok(win, TRUE);
+	wscrl(win, n);
+	scrollok(win, FALSE);
+	*scroll = *scroll + n;
+	wrefresh(win);
+}
+
+/*
+ * Display a menu for choosing among a number of options
+ */
+int dialog_menu(const char *title, const char *prompt,
+		const void *selected, int *s_scroll)
+{
+	int i, j, x, y, box_x, box_y;
+	int height, width, menu_height;
+	int key = 0, button = 0, scroll = 0, choice = 0;
+	int first_item =  0, max_choice;
+	WINDOW *dialog, *menu;
+
+do_resize:
+	height = getmaxy(stdscr);
+	width = getmaxx(stdscr);
+	if (height < MENUBOX_HEIGTH_MIN || width < MENUBOX_WIDTH_MIN)
+		return -ERRDISPLAYTOOSMALL;
+
+	height -= 4;
+	width  -= 5;
+	menu_height = height - 10;
+
+	max_choice = MIN(menu_height, item_count());
+
+	/* 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);
+
+	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);
+
+	wattrset(dialog, dlg.dialog.atr);
+	print_autowrap(dialog, prompt, width - 2, 1, 3);
+
+	menu_width = width - 6;
+	box_y = height - menu_height - 5;
+	box_x = (width - menu_width) / 2 - 1;
+
+	/* create new window for the menu */
+	menu = subwin(dialog, menu_height, menu_width,
+		      y + box_y + 1, x + box_x + 1);
+	keypad(menu, TRUE);
+
+	/* draw a box around the menu items */
+	draw_box(dialog, box_y, box_x, menu_height + 2, menu_width + 2,
+		 dlg.menubox_border.atr, dlg.menubox.atr);
+
+	if (menu_width >= 80)
+		item_x = (menu_width - 70) / 2;
+	else
+		item_x = 4;
+
+	/* Set choice to default item */
+	item_foreach()
+		if (selected && (selected == item_data()))
+			choice = item_n();
+	/* get the saved scroll info */
+	scroll = *s_scroll;
+	if ((scroll <= choice) && (scroll + max_choice > choice) &&
+	   (scroll >= 0) && (scroll + max_choice <= item_count())) {
+		first_item = scroll;
+		choice = choice - scroll;
+	} else {
+		scroll = 0;
+	}
+	if ((choice >= max_choice)) {
+		if (choice >= item_count() - max_choice / 2)
+			scroll = first_item = item_count() - max_choice;
+		else
+			scroll = first_item = choice - max_choice / 2;
+		choice = choice - scroll;
+	}
+
+	/* Print the menu */
+	for (i = 0; i < max_choice; i++) {
+		print_item(first_item + i, i, i == choice);
+	}
+
+	wnoutrefresh(menu);
+
+	print_arrows(dialog, item_count(), scroll,
+		     box_y, box_x + item_x + 1, menu_height);
+
+	print_buttons(dialog, height, width, 0);
+	wmove(menu, choice, item_x + 1);
+	wrefresh(menu);
+
+	while (key != KEY_ESC) {
+		key = wgetch(menu);
+
+		if (key < 256 && isalpha(key))
+			key = tolower(key);
+
+		if (strchr("ynmh", key))
+			i = max_choice;
+		else {
+			for (i = choice + 1; i < max_choice; i++) {
+				item_set(scroll + i);
+				j = first_alpha(item_str(), "YyNnMmHh");
+				if (key == tolower(item_str()[j]))
+					break;
+			}
+			if (i == max_choice)
+				for (i = 0; i < max_choice; i++) {
+					item_set(scroll + i);
+					j = first_alpha(item_str(), "YyNnMmHh");
+					if (key == tolower(item_str()[j]))
+						break;
+				}
+		}
+
+		if (item_count() != 0 &&
+		    (i < max_choice ||
+		     key == KEY_UP || key == KEY_DOWN ||
+		     key == '-' || key == '+' ||
+		     key == KEY_PPAGE || key == KEY_NPAGE)) {
+			/* Remove highligt of current item */
+			print_item(scroll + choice, choice, FALSE);
+
+			if (key == KEY_UP || key == '-') {
+				if (choice < 2 && scroll) {
+					/* Scroll menu down */
+					do_scroll(menu, &scroll, -1);
+
+					print_item(scroll, 0, FALSE);
+				} else
+					choice = MAX(choice - 1, 0);
+
+			} else if (key == KEY_DOWN || key == '+') {
+				print_item(scroll+choice, choice, FALSE);
+
+				if ((choice > max_choice - 3) &&
+				    (scroll + max_choice < item_count())) {
+					/* Scroll menu up */
+					do_scroll(menu, &scroll, 1);
+
+					print_item(scroll+max_choice - 1,
+						   max_choice - 1, FALSE);
+				} else
+					choice = MIN(choice + 1, max_choice - 1);
+
+			} else if (key == KEY_PPAGE) {
+				scrollok(menu, TRUE);
+				for (i = 0; (i < max_choice); i++) {
+					if (scroll > 0) {
+						do_scroll(menu, &scroll, -1);
+						print_item(scroll, 0, FALSE);
+					} else {
+						if (choice > 0)
+							choice--;
+					}
+				}
+
+			} else if (key == KEY_NPAGE) {
+				for (i = 0; (i < max_choice); i++) {
+					if (scroll + max_choice < item_count()) {
+						do_scroll(menu, &scroll, 1);
+						print_item(scroll+max_choice-1,
+							   max_choice - 1, FALSE);
+					} else {
+						if (choice + 1 < max_choice)
+							choice++;
+					}
+				}
+			} else
+				choice = i;
+
+			print_item(scroll + choice, choice, TRUE);
+
+			print_arrows(dialog, item_count(), scroll,
+				     box_y, box_x + item_x + 1, menu_height);
+
+			wnoutrefresh(dialog);
+			wrefresh(menu);
+
+			continue;	/* wait for another key press */
+		}
+
+		switch (key) {
+		case KEY_LEFT:
+		case TAB:
+		case KEY_RIGHT:
+			button = ((key == KEY_LEFT ? --button : ++button) < 0)
+			    ? 4 : (button > 4 ? 0 : button);
+
+			print_buttons(dialog, height, width, button);
+			wrefresh(menu);
+			break;
+		case ' ':
+		case 's':
+		case 'y':
+		case 'n':
+		case 'm':
+		case '/':
+		case 'h':
+		case '?':
+		case 'z':
+		case '\n':
+			/* save scroll info */
+			*s_scroll = scroll;
+			delwin(menu);
+			delwin(dialog);
+			item_set(scroll + choice);
+			item_set_selected(1);
+			switch (key) {
+			case 'h':
+			case '?':
+				return 2;
+			case 's':
+			case 'y':
+				return 5;
+			case 'n':
+				return 6;
+			case 'm':
+				return 7;
+			case ' ':
+				return 8;
+			case '/':
+				return 9;
+			case 'z':
+				return 10;
+			case '\n':
+				return button;
+			}
+			return 0;
+		case 'e':
+		case 'x':
+			key = KEY_ESC;
+			break;
+		case KEY_ESC:
+			key = on_key_esc(menu);
+			break;
+		case KEY_RESIZE:
+			on_key_resize();
+			delwin(menu);
+			delwin(dialog);
+			goto do_resize;
+		}
+	}
+	delwin(menu);
+	delwin(dialog);
+	return key;		/* ESC pressed */
+}

nemu/tools/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);
+}

nemu/tools/kconfig/lxdialog/util.c

@@ -0,0 +1,700 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  util.c
+ *
+ *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
+ *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
+ */
+
+#include <stdarg.h>
+
+#include "dialog.h"
+
+/* Needed in signal handler in mconf.c */
+int saved_x, saved_y;
+
+struct dialog_info dlg;
+
+static void set_mono_theme(void)
+{
+	dlg.screen.atr = A_NORMAL;
+	dlg.shadow.atr = A_NORMAL;
+	dlg.dialog.atr = A_NORMAL;
+	dlg.title.atr = A_BOLD;
+	dlg.border.atr = A_NORMAL;
+	dlg.button_active.atr = A_REVERSE;
+	dlg.button_inactive.atr = A_DIM;
+	dlg.button_key_active.atr = A_REVERSE;
+	dlg.button_key_inactive.atr = A_BOLD;
+	dlg.button_label_active.atr = A_REVERSE;
+	dlg.button_label_inactive.atr = A_NORMAL;
+	dlg.inputbox.atr = A_NORMAL;
+	dlg.inputbox_border.atr = A_NORMAL;
+	dlg.searchbox.atr = A_NORMAL;
+	dlg.searchbox_title.atr = A_BOLD;
+	dlg.searchbox_border.atr = A_NORMAL;
+	dlg.position_indicator.atr = A_BOLD;
+	dlg.menubox.atr = A_NORMAL;
+	dlg.menubox_border.atr = A_NORMAL;
+	dlg.item.atr = A_NORMAL;
+	dlg.item_selected.atr = A_REVERSE;
+	dlg.tag.atr = A_BOLD;
+	dlg.tag_selected.atr = A_REVERSE;
+	dlg.tag_key.atr = A_BOLD;
+	dlg.tag_key_selected.atr = A_REVERSE;
+	dlg.check.atr = A_BOLD;
+	dlg.check_selected.atr = A_REVERSE;
+	dlg.uarrow.atr = A_BOLD;
+	dlg.darrow.atr = A_BOLD;
+}
+
+#define DLG_COLOR(dialog, f, b, h) \
+do {                               \
+	dlg.dialog.fg = (f);       \
+	dlg.dialog.bg = (b);       \
+	dlg.dialog.hl = (h);       \
+} while (0)
+
+static void set_classic_theme(void)
+{
+	DLG_COLOR(screen,                COLOR_CYAN,   COLOR_BLUE,   true);
+	DLG_COLOR(shadow,                COLOR_BLACK,  COLOR_BLACK,  true);
+	DLG_COLOR(dialog,                COLOR_BLACK,  COLOR_WHITE,  false);
+	DLG_COLOR(title,                 COLOR_YELLOW, COLOR_WHITE,  true);
+	DLG_COLOR(border,                COLOR_WHITE,  COLOR_WHITE,  true);
+	DLG_COLOR(button_active,         COLOR_WHITE,  COLOR_BLUE,   true);
+	DLG_COLOR(button_inactive,       COLOR_BLACK,  COLOR_WHITE,  false);
+	DLG_COLOR(button_key_active,     COLOR_WHITE,  COLOR_BLUE,   true);
+	DLG_COLOR(button_key_inactive,   COLOR_RED,    COLOR_WHITE,  false);
+	DLG_COLOR(button_label_active,   COLOR_YELLOW, COLOR_BLUE,   true);
+	DLG_COLOR(button_label_inactive, COLOR_BLACK,  COLOR_WHITE,  true);
+	DLG_COLOR(inputbox,              COLOR_BLACK,  COLOR_WHITE,  false);
+	DLG_COLOR(inputbox_border,       COLOR_BLACK,  COLOR_WHITE,  false);
+	DLG_COLOR(searchbox,             COLOR_BLACK,  COLOR_WHITE,  false);
+	DLG_COLOR(searchbox_title,       COLOR_YELLOW, COLOR_WHITE,  true);
+	DLG_COLOR(searchbox_border,      COLOR_WHITE,  COLOR_WHITE,  true);
+	DLG_COLOR(position_indicator,    COLOR_YELLOW, COLOR_WHITE,  true);
+	DLG_COLOR(menubox,               COLOR_BLACK,  COLOR_WHITE,  false);
+	DLG_COLOR(menubox_border,        COLOR_WHITE,  COLOR_WHITE,  true);
+	DLG_COLOR(item,                  COLOR_BLACK,  COLOR_WHITE,  false);
+	DLG_COLOR(item_selected,         COLOR_WHITE,  COLOR_BLUE,   true);
+	DLG_COLOR(tag,                   COLOR_YELLOW, COLOR_WHITE,  true);
+	DLG_COLOR(tag_selected,          COLOR_YELLOW, COLOR_BLUE,   true);
+	DLG_COLOR(tag_key,               COLOR_YELLOW, COLOR_WHITE,  true);
+	DLG_COLOR(tag_key_selected,      COLOR_YELLOW, COLOR_BLUE,   true);
+	DLG_COLOR(check,                 COLOR_BLACK,  COLOR_WHITE,  false);
+	DLG_COLOR(check_selected,        COLOR_WHITE,  COLOR_BLUE,   true);
+	DLG_COLOR(uarrow,                COLOR_GREEN,  COLOR_WHITE,  true);
+	DLG_COLOR(darrow,                COLOR_GREEN,  COLOR_WHITE,  true);
+}
+
+static void set_blackbg_theme(void)
+{
+	DLG_COLOR(screen, COLOR_RED,   COLOR_BLACK, true);
+	DLG_COLOR(shadow, COLOR_BLACK, COLOR_BLACK, false);
+	DLG_COLOR(dialog, COLOR_WHITE, COLOR_BLACK, false);
+	DLG_COLOR(title,  COLOR_RED,   COLOR_BLACK, false);
+	DLG_COLOR(border, COLOR_BLACK, COLOR_BLACK, true);
+
+	DLG_COLOR(button_active,         COLOR_YELLOW, COLOR_RED,   false);
+	DLG_COLOR(button_inactive,       COLOR_YELLOW, COLOR_BLACK, false);
+	DLG_COLOR(button_key_active,     COLOR_YELLOW, COLOR_RED,   true);
+	DLG_COLOR(button_key_inactive,   COLOR_RED,    COLOR_BLACK, false);
+	DLG_COLOR(button_label_active,   COLOR_WHITE,  COLOR_RED,   false);
+	DLG_COLOR(button_label_inactive, COLOR_BLACK,  COLOR_BLACK, true);
+
+	DLG_COLOR(inputbox,         COLOR_YELLOW, COLOR_BLACK, false);
+	DLG_COLOR(inputbox_border,  COLOR_YELLOW, COLOR_BLACK, false);
+
+	DLG_COLOR(searchbox,        COLOR_YELLOW, COLOR_BLACK, false);
+	DLG_COLOR(searchbox_title,  COLOR_YELLOW, COLOR_BLACK, true);
+	DLG_COLOR(searchbox_border, COLOR_BLACK,  COLOR_BLACK, true);
+
+	DLG_COLOR(position_indicator, COLOR_RED, COLOR_BLACK,  false);
+
+	DLG_COLOR(menubox,          COLOR_YELLOW, COLOR_BLACK, false);
+	DLG_COLOR(menubox_border,   COLOR_BLACK,  COLOR_BLACK, true);
+
+	DLG_COLOR(item,             COLOR_WHITE, COLOR_BLACK, false);
+	DLG_COLOR(item_selected,    COLOR_WHITE, COLOR_RED,   false);
+
+	DLG_COLOR(tag,              COLOR_RED,    COLOR_BLACK, false);
+	DLG_COLOR(tag_selected,     COLOR_YELLOW, COLOR_RED,   true);
+	DLG_COLOR(tag_key,          COLOR_RED,    COLOR_BLACK, false);
+	DLG_COLOR(tag_key_selected, COLOR_YELLOW, COLOR_RED,   true);
+
+	DLG_COLOR(check,            COLOR_YELLOW, COLOR_BLACK, false);
+	DLG_COLOR(check_selected,   COLOR_YELLOW, COLOR_RED,   true);
+
+	DLG_COLOR(uarrow, COLOR_RED, COLOR_BLACK, false);
+	DLG_COLOR(darrow, COLOR_RED, COLOR_BLACK, false);
+}
+
+static void set_bluetitle_theme(void)
+{
+	set_classic_theme();
+	DLG_COLOR(title,               COLOR_BLUE,   COLOR_WHITE, true);
+	DLG_COLOR(button_key_active,   COLOR_YELLOW, COLOR_BLUE,  true);
+	DLG_COLOR(button_label_active, COLOR_WHITE,  COLOR_BLUE,  true);
+	DLG_COLOR(searchbox_title,     COLOR_BLUE,   COLOR_WHITE, true);
+	DLG_COLOR(position_indicator,  COLOR_BLUE,   COLOR_WHITE, true);
+	DLG_COLOR(tag,                 COLOR_BLUE,   COLOR_WHITE, true);
+	DLG_COLOR(tag_key,             COLOR_BLUE,   COLOR_WHITE, true);
+
+}
+
+/*
+ * Select color theme
+ */
+static int set_theme(const char *theme)
+{
+	int use_color = 1;
+	if (!theme)
+		set_bluetitle_theme();
+	else if (strcmp(theme, "classic") == 0)
+		set_classic_theme();
+	else if (strcmp(theme, "bluetitle") == 0)
+		set_bluetitle_theme();
+	else if (strcmp(theme, "blackbg") == 0)
+		set_blackbg_theme();
+	else if (strcmp(theme, "mono") == 0)
+		use_color = 0;
+
+	return use_color;
+}
+
+static void init_one_color(struct dialog_color *color)
+{
+	static int pair = 0;
+
+	pair++;
+	init_pair(pair, color->fg, color->bg);
+	if (color->hl)
+		color->atr = A_BOLD | COLOR_PAIR(pair);
+	else
+		color->atr = COLOR_PAIR(pair);
+}
+
+static void init_dialog_colors(void)
+{
+	init_one_color(&dlg.screen);
+	init_one_color(&dlg.shadow);
+	init_one_color(&dlg.dialog);
+	init_one_color(&dlg.title);
+	init_one_color(&dlg.border);
+	init_one_color(&dlg.button_active);
+	init_one_color(&dlg.button_inactive);
+	init_one_color(&dlg.button_key_active);
+	init_one_color(&dlg.button_key_inactive);
+	init_one_color(&dlg.button_label_active);
+	init_one_color(&dlg.button_label_inactive);
+	init_one_color(&dlg.inputbox);
+	init_one_color(&dlg.inputbox_border);
+	init_one_color(&dlg.searchbox);
+	init_one_color(&dlg.searchbox_title);
+	init_one_color(&dlg.searchbox_border);
+	init_one_color(&dlg.position_indicator);
+	init_one_color(&dlg.menubox);
+	init_one_color(&dlg.menubox_border);
+	init_one_color(&dlg.item);
+	init_one_color(&dlg.item_selected);
+	init_one_color(&dlg.tag);
+	init_one_color(&dlg.tag_selected);
+	init_one_color(&dlg.tag_key);
+	init_one_color(&dlg.tag_key_selected);
+	init_one_color(&dlg.check);
+	init_one_color(&dlg.check_selected);
+	init_one_color(&dlg.uarrow);
+	init_one_color(&dlg.darrow);
+}
+
+/*
+ * Setup for color display
+ */
+static void color_setup(const char *theme)
+{
+	int use_color;
+
+	use_color = set_theme(theme);
+	if (use_color && has_colors()) {
+		start_color();
+		init_dialog_colors();
+	} else
+		set_mono_theme();
+}
+
+/*
+ * Set window to attribute 'attr'
+ */
+void attr_clear(WINDOW * win, int height, int width, chtype attr)
+{
+	int i, j;
+
+	wattrset(win, attr);
+	for (i = 0; i < height; i++) {
+		wmove(win, i, 0);
+		for (j = 0; j < width; j++)
+			waddch(win, ' ');
+	}
+	touchwin(win);
+}
+
+void dialog_clear(void)
+{
+	int lines, columns;
+
+	lines = getmaxy(stdscr);
+	columns = getmaxx(stdscr);
+
+	attr_clear(stdscr, lines, columns, dlg.screen.atr);
+	/* Display background title if it exists ... - SLH */
+	if (dlg.backtitle != NULL) {
+		int i, len = 0, skip = 0;
+		struct subtitle_list *pos;
+
+		wattrset(stdscr, dlg.screen.atr);
+		mvwaddstr(stdscr, 0, 1, (char *)dlg.backtitle);
+
+		for (pos = dlg.subtitles; pos != NULL; pos = pos->next) {
+			/* 3 is for the arrow and spaces */
+			len += strlen(pos->text) + 3;
+		}
+
+		wmove(stdscr, 1, 1);
+		if (len > columns - 2) {
+			const char *ellipsis = "[...] ";
+			waddstr(stdscr, ellipsis);
+			skip = len - (columns - 2 - strlen(ellipsis));
+		}
+
+		for (pos = dlg.subtitles; pos != NULL; pos = pos->next) {
+			if (skip == 0)
+				waddch(stdscr, ACS_RARROW);
+			else
+				skip--;
+
+			if (skip == 0)
+				waddch(stdscr, ' ');
+			else
+				skip--;
+
+			if (skip < strlen(pos->text)) {
+				waddstr(stdscr, pos->text + skip);
+				skip = 0;
+			} else
+				skip -= strlen(pos->text);
+
+			if (skip == 0)
+				waddch(stdscr, ' ');
+			else
+				skip--;
+		}
+
+		for (i = len + 1; i < columns - 1; i++)
+			waddch(stdscr, ACS_HLINE);
+	}
+	wnoutrefresh(stdscr);
+}
+
+/*
+ * Do some initialization for dialog
+ */
+int init_dialog(const char *backtitle)
+{
+	int height, width;
+
+	initscr();		/* Init curses */
+
+	/* Get current cursor position for signal handler in mconf.c */
+	getyx(stdscr, saved_y, saved_x);
+
+	getmaxyx(stdscr, height, width);
+	if (height < WINDOW_HEIGTH_MIN || width < WINDOW_WIDTH_MIN) {
+		endwin();
+		return -ERRDISPLAYTOOSMALL;
+	}
+
+	dlg.backtitle = backtitle;
+	color_setup(getenv("MENUCONFIG_COLOR"));
+
+	keypad(stdscr, TRUE);
+	cbreak();
+	noecho();
+	dialog_clear();
+
+	return 0;
+}
+
+void set_dialog_backtitle(const char *backtitle)
+{
+	dlg.backtitle = backtitle;
+}
+
+void set_dialog_subtitles(struct subtitle_list *subtitles)
+{
+	dlg.subtitles = subtitles;
+}
+
+/*
+ * End using dialog functions.
+ */
+void end_dialog(int x, int y)
+{
+	/* move cursor back to original position */
+	move(y, x);
+	refresh();
+	endwin();
+}
+
+/* Print the title of the dialog. Center the title and truncate
+ * tile if wider than dialog (- 2 chars).
+ **/
+void print_title(WINDOW *dialog, const char *title, int width)
+{
+	if (title) {
+		int tlen = MIN(width - 2, strlen(title));
+		wattrset(dialog, dlg.title.atr);
+		mvwaddch(dialog, 0, (width - tlen) / 2 - 1, ' ');
+		mvwaddnstr(dialog, 0, (width - tlen)/2, title, tlen);
+		waddch(dialog, ' ');
+	}
+}
+
+/*
+ * Print a string of text in a window, automatically wrap around to the
+ * next line if the string is too long to fit on one line. Newline
+ * characters '\n' are propperly processed.  We start on a new line
+ * if there is no room for at least 4 nonblanks following a double-space.
+ */
+void print_autowrap(WINDOW * win, const char *prompt, int width, int y, int x)
+{
+	int newl, cur_x, cur_y;
+	int prompt_len, room, wlen;
+	char tempstr[MAX_LEN + 1], *word, *sp, *sp2, *newline_separator = 0;
+
+	strcpy(tempstr, prompt);
+
+	prompt_len = strlen(tempstr);
+
+	if (prompt_len <= width - x * 2) {	/* If prompt is short */
+		wmove(win, y, (width - prompt_len) / 2);
+		waddstr(win, tempstr);
+	} else {
+		cur_x = x;
+		cur_y = y;
+		newl = 1;
+		word = tempstr;
+		while (word && *word) {
+			sp = strpbrk(word, "\n ");
+			if (sp && *sp == '\n')
+				newline_separator = sp;
+
+			if (sp)
+				*sp++ = 0;
+
+			/* Wrap to next line if either the word does not fit,
+			   or it is the first word of a new sentence, and it is
+			   short, and the next word does not fit. */
+			room = width - cur_x;
+			wlen = strlen(word);
+			if (wlen > room ||
+			    (newl && wlen < 4 && sp
+			     && wlen + 1 + strlen(sp) > room
+			     && (!(sp2 = strpbrk(sp, "\n "))
+				 || wlen + 1 + (sp2 - sp) > room))) {
+				cur_y++;
+				cur_x = x;
+			}
+			wmove(win, cur_y, cur_x);
+			waddstr(win, word);
+			getyx(win, cur_y, cur_x);
+
+			/* Move to the next line if the word separator was a newline */
+			if (newline_separator) {
+				cur_y++;
+				cur_x = x;
+				newline_separator = 0;
+			} else
+				cur_x++;
+
+			if (sp && *sp == ' ') {
+				cur_x++;	/* double space */
+				while (*++sp == ' ') ;
+				newl = 1;
+			} else
+				newl = 0;
+			word = sp;
+		}
+	}
+}
+
+/*
+ * Print a button
+ */
+void print_button(WINDOW * win, const char *label, int y, int x, int selected)
+{
+	int i, temp;
+
+	wmove(win, y, x);
+	wattrset(win, selected ? dlg.button_active.atr
+		 : dlg.button_inactive.atr);
+	waddstr(win, "<");
+	temp = strspn(label, " ");
+	label += temp;
+	wattrset(win, selected ? dlg.button_label_active.atr
+		 : dlg.button_label_inactive.atr);
+	for (i = 0; i < temp; i++)
+		waddch(win, ' ');
+	wattrset(win, selected ? dlg.button_key_active.atr
+		 : dlg.button_key_inactive.atr);
+	waddch(win, label[0]);
+	wattrset(win, selected ? dlg.button_label_active.atr
+		 : dlg.button_label_inactive.atr);
+	waddstr(win, (char *)label + 1);
+	wattrset(win, selected ? dlg.button_active.atr
+		 : dlg.button_inactive.atr);
+	waddstr(win, ">");
+	wmove(win, y, x + temp + 1);
+}
+
+/*
+ * Draw a rectangular box with line drawing characters
+ */
+void
+draw_box(WINDOW * win, int y, int x, int height, int width,
+	 chtype box, chtype border)
+{
+	int i, j;
+
+	wattrset(win, 0);
+	for (i = 0; i < height; i++) {
+		wmove(win, y + i, x);
+		for (j = 0; j < width; j++)
+			if (!i && !j)
+				waddch(win, border | ACS_ULCORNER);
+			else if (i == height - 1 && !j)
+				waddch(win, border | ACS_LLCORNER);
+			else if (!i && j == width - 1)
+				waddch(win, box | ACS_URCORNER);
+			else if (i == height - 1 && j == width - 1)
+				waddch(win, box | ACS_LRCORNER);
+			else if (!i)
+				waddch(win, border | ACS_HLINE);
+			else if (i == height - 1)
+				waddch(win, box | ACS_HLINE);
+			else if (!j)
+				waddch(win, border | ACS_VLINE);
+			else if (j == width - 1)
+				waddch(win, box | ACS_VLINE);
+			else
+				waddch(win, box | ' ');
+	}
+}
+
+/*
+ * Draw shadows along the right and bottom edge to give a more 3D look
+ * to the boxes
+ */
+void draw_shadow(WINDOW * win, int y, int x, int height, int width)
+{
+	int i;
+
+	if (has_colors()) {	/* Whether terminal supports color? */
+		wattrset(win, dlg.shadow.atr);
+		wmove(win, y + height, x + 2);
+		for (i = 0; i < width; i++)
+			waddch(win, winch(win) & A_CHARTEXT);
+		for (i = y + 1; i < y + height + 1; i++) {
+			wmove(win, i, x + width);
+			waddch(win, winch(win) & A_CHARTEXT);
+			waddch(win, winch(win) & A_CHARTEXT);
+		}
+		wnoutrefresh(win);
+	}
+}
+
+/*
+ *  Return the position of the first alphabetic character in a string.
+ */
+int first_alpha(const char *string, const char *exempt)
+{
+	int i, in_paren = 0, c;
+
+	for (i = 0; i < strlen(string); i++) {
+		c = tolower(string[i]);
+
+		if (strchr("<[(", c))
+			++in_paren;
+		if (strchr(">])", c) && in_paren > 0)
+			--in_paren;
+
+		if ((!in_paren) && isalpha(c) && strchr(exempt, c) == 0)
+			return i;
+	}
+
+	return 0;
+}
+
+/*
+ * ncurses uses ESC to detect escaped char sequences. This resutl in
+ * a small timeout before ESC is actually delivered to the application.
+ * lxdialog suggest <ESC> <ESC> which is correctly translated to two
+ * times esc. But then we need to ignore the second esc to avoid stepping
+ * out one menu too much. Filter away all escaped key sequences since
+ * keypad(FALSE) turn off ncurses support for escape sequences - and thats
+ * needed to make notimeout() do as expected.
+ */
+int on_key_esc(WINDOW *win)
+{
+	int key;
+	int key2;
+	int key3;
+
+	nodelay(win, TRUE);
+	keypad(win, FALSE);
+	key = wgetch(win);
+	key2 = wgetch(win);
+	do {
+		key3 = wgetch(win);
+	} while (key3 != ERR);
+	nodelay(win, FALSE);
+	keypad(win, TRUE);
+	if (key == KEY_ESC && key2 == ERR)
+		return KEY_ESC;
+	else if (key != ERR && key != KEY_ESC && key2 == ERR)
+		ungetch(key);
+
+	return -1;
+}
+
+/* redraw screen in new size */
+int on_key_resize(void)
+{
+	dialog_clear();
+	return KEY_RESIZE;
+}
+
+struct dialog_list *item_cur;
+struct dialog_list item_nil;
+struct dialog_list *item_head;
+
+void item_reset(void)
+{
+	struct dialog_list *p, *next;
+
+	for (p = item_head; p; p = next) {
+		next = p->next;
+		free(p);
+	}
+	item_head = NULL;
+	item_cur = &item_nil;
+}
+
+void item_make(const char *fmt, ...)
+{
+	va_list ap;
+	struct dialog_list *p = malloc(sizeof(*p));
+
+	if (item_head)
+		item_cur->next = p;
+	else
+		item_head = p;
+	item_cur = p;
+	memset(p, 0, sizeof(*p));
+
+	va_start(ap, fmt);
+	vsnprintf(item_cur->node.str, sizeof(item_cur->node.str), fmt, ap);
+	va_end(ap);
+}
+
+void item_add_str(const char *fmt, ...)
+{
+	va_list ap;
+	size_t avail;
+
+	avail = sizeof(item_cur->node.str) - strlen(item_cur->node.str);
+
+	va_start(ap, fmt);
+	vsnprintf(item_cur->node.str + strlen(item_cur->node.str),
+		  avail, fmt, ap);
+	item_cur->node.str[sizeof(item_cur->node.str) - 1] = '\0';
+	va_end(ap);
+}
+
+void item_set_tag(char tag)
+{
+	item_cur->node.tag = tag;
+}
+void item_set_data(void *ptr)
+{
+	item_cur->node.data = ptr;
+}
+
+void item_set_selected(int val)
+{
+	item_cur->node.selected = val;
+}
+
+int item_activate_selected(void)
+{
+	item_foreach()
+		if (item_is_selected())
+			return 1;
+	return 0;
+}
+
+void *item_data(void)
+{
+	return item_cur->node.data;
+}
+
+char item_tag(void)
+{
+	return item_cur->node.tag;
+}
+
+int item_count(void)
+{
+	int n = 0;
+	struct dialog_list *p;
+
+	for (p = item_head; p; p = p->next)
+		n++;
+	return n;
+}
+
+void item_set(int n)
+{
+	int i = 0;
+	item_foreach()
+		if (i++ == n)
+			return;
+}
+
+int item_n(void)
+{
+	int n = 0;
+	struct dialog_list *p;
+
+	for (p = item_head; p; p = p->next) {
+		if (p == item_cur)
+			return n;
+		n++;
+	}
+	return 0;
+}
+
+const char *item_str(void)
+{
+	return item_cur->node.str;
+}
+
+int item_is_selected(void)
+{
+	return (item_cur->node.selected != 0);
+}
+
+int item_is_tag(char tag)
+{
+	return (item_cur->node.tag == tag);
+}

nemu/tools/kconfig/lxdialog/yesno.c

@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  yesno.c -- implements the yes/no box
+ *
+ *  ORIGINAL AUTHOR: Savio Lam (lam836@cs.cuhk.hk)
+ *  MODIFIED FOR LINUX KERNEL CONFIG BY: William Roadcap (roadcap@cfw.com)
+ */
+
+#include "dialog.h"
+
+/*
+ * Display termination buttons
+ */
+static void print_buttons(WINDOW * dialog, int height, int width, int selected)
+{
+	int x = width / 2 - 10;
+	int y = height - 2;
+
+	print_button(dialog, " Yes ", y, x, selected == 0);
+	print_button(dialog, "  No  ", y, x + 13, selected == 1);
+
+	wmove(dialog, y, x + 1 + 13 * selected);
+	wrefresh(dialog);
+}
+
+/*
+ * Display a dialog box with two buttons - Yes and No
+ */
+int dialog_yesno(const char *title, const char *prompt, int height, int width)
+{
+	int i, x, y, key = 0, button = 0;
+	WINDOW *dialog;
+
+do_resize:
+	if (getmaxy(stdscr) < (height + YESNO_HEIGTH_MIN))
+		return -ERRDISPLAYTOOSMALL;
+	if (getmaxx(stdscr) < (width + YESNO_WIDTH_MIN))
+		return -ERRDISPLAYTOOSMALL;
+
+	/* 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);
+
+	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);
+	waddch(dialog, ACS_RTEE);
+
+	print_title(dialog, title, width);
+
+	wattrset(dialog, dlg.dialog.atr);
+	print_autowrap(dialog, prompt, width - 2, 1, 3);
+
+	print_buttons(dialog, height, width, 0);
+
+	while (key != KEY_ESC) {
+		key = wgetch(dialog);
+		switch (key) {
+		case 'Y':
+		case 'y':
+			delwin(dialog);
+			return 0;
+		case 'N':
+		case 'n':
+			delwin(dialog);
+			return 1;
+
+		case TAB:
+		case KEY_LEFT:
+		case KEY_RIGHT:
+			button = ((key == KEY_LEFT ? --button : ++button) < 0) ? 1 : (button > 1 ? 0 : button);
+
+			print_buttons(dialog, height, width, button);
+			wrefresh(dialog);
+			break;
+		case ' ':
+		case '\n':
+			delwin(dialog);
+			return button;
+		case KEY_ESC:
+			key = on_key_esc(dialog);
+			break;
+		case KEY_RESIZE:
+			delwin(dialog);
+			on_key_resize();
+			goto do_resize;
+		}
+	}
+
+	delwin(dialog);
+	return key;		/* ESC pressed */
+}

nemu/tools/kconfig/menu.c

@@ -0,0 +1,899 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
+ */
+
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "lkc.h"
+
+static const char nohelp_text[] = "There is no help available for this option.";
+
+struct menu rootmenu;
+static struct menu **last_entry_ptr;
+
+struct file *file_list;
+struct file *current_file;
+
+void menu_warn(struct menu *menu, const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	fprintf(stderr, "%s:%d:warning: ", menu->file->name, menu->lineno);
+	vfprintf(stderr, fmt, ap);
+	fprintf(stderr, "\n");
+	va_end(ap);
+}
+
+static void prop_warn(struct property *prop, const char *fmt, ...)
+{
+	va_list ap;
+	va_start(ap, fmt);
+	fprintf(stderr, "%s:%d:warning: ", prop->file->name, prop->lineno);
+	vfprintf(stderr, fmt, ap);
+	fprintf(stderr, "\n");
+	va_end(ap);
+}
+
+void _menu_init(void)
+{
+	current_entry = current_menu = &rootmenu;
+	last_entry_ptr = &rootmenu.list;
+}
+
+void menu_add_entry(struct symbol *sym)
+{
+	struct menu *menu;
+
+	menu = xmalloc(sizeof(*menu));
+	memset(menu, 0, sizeof(*menu));
+	menu->sym = sym;
+	menu->parent = current_menu;
+	menu->file = current_file;
+	menu->lineno = zconf_lineno();
+
+	*last_entry_ptr = menu;
+	last_entry_ptr = &menu->next;
+	current_entry = menu;
+	if (sym)
+		menu_add_symbol(P_SYMBOL, sym, NULL);
+}
+
+struct menu *menu_add_menu(void)
+{
+	last_entry_ptr = &current_entry->list;
+	current_menu = current_entry;
+	return current_menu;
+}
+
+void menu_end_menu(void)
+{
+	last_entry_ptr = &current_menu->next;
+	current_menu = current_menu->parent;
+}
+
+/*
+ * Rewrites 'm' to 'm' && MODULES, so that it evaluates to 'n' when running
+ * without modules
+ */
+static struct expr *rewrite_m(struct expr *e)
+{
+	if (!e)
+		return e;
+
+	switch (e->type) {
+	case E_NOT:
+		e->left.expr = rewrite_m(e->left.expr);
+		break;
+	case E_OR:
+	case E_AND:
+		e->left.expr = rewrite_m(e->left.expr);
+		e->right.expr = rewrite_m(e->right.expr);
+		break;
+	case E_SYMBOL:
+		/* change 'm' into 'm' && MODULES */
+		if (e->left.sym == &symbol_mod)
+			return expr_alloc_and(e, expr_alloc_symbol(modules_sym));
+		break;
+	default:
+		break;
+	}
+	return e;
+}
+
+void menu_add_dep(struct expr *dep)
+{
+	current_entry->dep = expr_alloc_and(current_entry->dep, dep);
+}
+
+void menu_set_type(int type)
+{
+	struct symbol *sym = current_entry->sym;
+
+	if (sym->type == type)
+		return;
+	if (sym->type == S_UNKNOWN) {
+		sym->type = type;
+		return;
+	}
+	menu_warn(current_entry,
+		"ignoring type redefinition of '%s' from '%s' to '%s'",
+		sym->name ? sym->name : "<choice>",
+		sym_type_name(sym->type), sym_type_name(type));
+}
+
+static struct property *menu_add_prop(enum prop_type type, struct expr *expr,
+				      struct expr *dep)
+{
+	struct property *prop;
+
+	prop = xmalloc(sizeof(*prop));
+	memset(prop, 0, sizeof(*prop));
+	prop->type = type;
+	prop->file = current_file;
+	prop->lineno = zconf_lineno();
+	prop->menu = current_entry;
+	prop->expr = expr;
+	prop->visible.expr = dep;
+
+	/* append property to the prop list of symbol */
+	if (current_entry->sym) {
+		struct property **propp;
+
+		for (propp = &current_entry->sym->prop;
+		     *propp;
+		     propp = &(*propp)->next)
+			;
+		*propp = prop;
+	}
+
+	return prop;
+}
+
+struct property *menu_add_prompt(enum prop_type type, char *prompt,
+				 struct expr *dep)
+{
+	struct property *prop = menu_add_prop(type, NULL, dep);
+
+	if (isspace(*prompt)) {
+		prop_warn(prop, "leading whitespace ignored");
+		while (isspace(*prompt))
+			prompt++;
+	}
+	if (current_entry->prompt)
+		prop_warn(prop, "prompt redefined");
+
+	/* Apply all upper menus' visibilities to actual prompts. */
+	if (type == P_PROMPT) {
+		struct menu *menu = current_entry;
+
+		while ((menu = menu->parent) != NULL) {
+			struct expr *dup_expr;
+
+			if (!menu->visibility)
+				continue;
+			/*
+			 * Do not add a reference to the menu's visibility
+			 * expression but use a copy of it. Otherwise the
+			 * expression reduction functions will modify
+			 * expressions that have multiple references which
+			 * can cause unwanted side effects.
+			 */
+			dup_expr = expr_copy(menu->visibility);
+
+			prop->visible.expr = expr_alloc_and(prop->visible.expr,
+							    dup_expr);
+		}
+	}
+
+	current_entry->prompt = prop;
+	prop->text = prompt;
+
+	return prop;
+}
+
+void menu_add_visibility(struct expr *expr)
+{
+	current_entry->visibility = expr_alloc_and(current_entry->visibility,
+	    expr);
+}
+
+void menu_add_expr(enum prop_type type, struct expr *expr, struct expr *dep)
+{
+	menu_add_prop(type, expr, dep);
+}
+
+void menu_add_symbol(enum prop_type type, struct symbol *sym, struct expr *dep)
+{
+	menu_add_prop(type, expr_alloc_symbol(sym), dep);
+}
+
+void menu_add_option_modules(void)
+{
+	if (modules_sym)
+		zconf_error("symbol '%s' redefines option 'modules' already defined by symbol '%s'",
+			    current_entry->sym->name, modules_sym->name);
+	modules_sym = current_entry->sym;
+}
+
+void menu_add_option_defconfig_list(void)
+{
+	if (!sym_defconfig_list)
+		sym_defconfig_list = current_entry->sym;
+	else if (sym_defconfig_list != current_entry->sym)
+		zconf_error("trying to redefine defconfig symbol");
+	sym_defconfig_list->flags |= SYMBOL_NO_WRITE;
+}
+
+void menu_add_option_allnoconfig_y(void)
+{
+	current_entry->sym->flags |= SYMBOL_ALLNOCONFIG_Y;
+}
+
+static int menu_validate_number(struct symbol *sym, struct symbol *sym2)
+{
+	return sym2->type == S_INT || sym2->type == S_HEX ||
+	       (sym2->type == S_UNKNOWN && sym_string_valid(sym, sym2->name));
+}
+
+static void sym_check_prop(struct symbol *sym)
+{
+	struct property *prop;
+	struct symbol *sym2;
+	char *use;
+
+	for (prop = sym->prop; prop; prop = prop->next) {
+		switch (prop->type) {
+		case P_DEFAULT:
+			if ((sym->type == S_STRING || sym->type == S_INT || sym->type == S_HEX) &&
+			    prop->expr->type != E_SYMBOL)
+				prop_warn(prop,
+				    "default for config symbol '%s'"
+				    " must be a single symbol", sym->name);
+			if (prop->expr->type != E_SYMBOL)
+				break;
+			sym2 = prop_get_symbol(prop);
+			if (sym->type == S_HEX || sym->type == S_INT) {
+				if (!menu_validate_number(sym, sym2))
+					prop_warn(prop,
+					    "'%s': number is invalid",
+					    sym->name);
+			}
+			if (sym_is_choice(sym)) {
+				struct property *choice_prop =
+					sym_get_choice_prop(sym2);
+
+				if (!choice_prop ||
+				    prop_get_symbol(choice_prop) != sym)
+					prop_warn(prop,
+						  "choice default symbol '%s' is not contained in the choice",
+						  sym2->name);
+			}
+			break;
+		case P_SELECT:
+		case P_IMPLY:
+			use = prop->type == P_SELECT ? "select" : "imply";
+			sym2 = prop_get_symbol(prop);
+			if (sym->type != S_BOOLEAN && sym->type != S_TRISTATE)
+				prop_warn(prop,
+				    "config symbol '%s' uses %s, but is "
+				    "not bool or tristate", sym->name, use);
+			else if (sym2->type != S_UNKNOWN &&
+				 sym2->type != S_BOOLEAN &&
+				 sym2->type != S_TRISTATE)
+				prop_warn(prop,
+				    "'%s' has wrong type. '%s' only "
+				    "accept arguments of bool and "
+				    "tristate type", sym2->name, use);
+			break;
+		case P_RANGE:
+			if (sym->type != S_INT && sym->type != S_HEX)
+				prop_warn(prop, "range is only allowed "
+						"for int or hex symbols");
+			if (!menu_validate_number(sym, prop->expr->left.sym) ||
+			    !menu_validate_number(sym, prop->expr->right.sym))
+				prop_warn(prop, "range is invalid");
+			break;
+		default:
+			;
+		}
+	}
+}
+
+void menu_finalize(struct menu *parent)
+{
+	struct menu *menu, *last_menu;
+	struct symbol *sym;
+	struct property *prop;
+	struct expr *parentdep, *basedep, *dep, *dep2, **ep;
+
+	sym = parent->sym;
+	if (parent->list) {
+		/*
+		 * This menu node has children. We (recursively) process them
+		 * and propagate parent dependencies before moving on.
+		 */
+
+		if (sym && sym_is_choice(sym)) {
+			if (sym->type == S_UNKNOWN) {
+				/* find the first choice value to find out choice type */
+				current_entry = parent;
+				for (menu = parent->list; menu; menu = menu->next) {
+					if (menu->sym && menu->sym->type != S_UNKNOWN) {
+						menu_set_type(menu->sym->type);
+						break;
+					}
+				}
+			}
+			/* set the type of the remaining choice values */
+			for (menu = parent->list; menu; menu = menu->next) {
+				current_entry = menu;
+				if (menu->sym && menu->sym->type == S_UNKNOWN)
+					menu_set_type(sym->type);
+			}
+
+			/*
+			 * Use the choice itself as the parent dependency of
+			 * the contained items. This turns the mode of the
+			 * choice into an upper bound on the visibility of the
+			 * choice value symbols.
+			 */
+			parentdep = expr_alloc_symbol(sym);
+		} else {
+			/* Menu node for 'menu', 'if' */
+			parentdep = parent->dep;
+		}
+
+		/* For each child menu node... */
+		for (menu = parent->list; menu; menu = menu->next) {
+			/*
+			 * Propagate parent dependencies to the child menu
+			 * node, also rewriting and simplifying expressions
+			 */
+			basedep = rewrite_m(menu->dep);
+			basedep = expr_transform(basedep);
+			basedep = expr_alloc_and(expr_copy(parentdep), basedep);
+			basedep = expr_eliminate_dups(basedep);
+			menu->dep = basedep;
+
+			if (menu->sym)
+				/*
+				 * Note: For symbols, all prompts are included
+				 * too in the symbol's own property list
+				 */
+				prop = menu->sym->prop;
+			else
+				/*
+				 * For non-symbol menu nodes, we just need to
+				 * handle the prompt
+				 */
+				prop = menu->prompt;
+
+			/* For each property... */
+			for (; prop; prop = prop->next) {
+				if (prop->menu != menu)
+					/*
+					 * Two possibilities:
+					 *
+					 * 1. The property lacks dependencies
+					 *    and so isn't location-specific,
+					 *    e.g. an 'option'
+					 *
+					 * 2. The property belongs to a symbol
+					 *    defined in multiple locations and
+					 *    is from some other location. It
+					 *    will be handled there in that
+					 *    case.
+					 *
+					 * Skip the property.
+					 */
+					continue;
+
+				/*
+				 * Propagate parent dependencies to the
+				 * property's condition, rewriting and
+				 * simplifying expressions at the same time
+				 */
+				dep = rewrite_m(prop->visible.expr);
+				dep = expr_transform(dep);
+				dep = expr_alloc_and(expr_copy(basedep), dep);
+				dep = expr_eliminate_dups(dep);
+				if (menu->sym && menu->sym->type != S_TRISTATE)
+					dep = expr_trans_bool(dep);
+				prop->visible.expr = dep;
+
+				/*
+				 * Handle selects and implies, which modify the
+				 * dependencies of the selected/implied symbol
+				 */
+				if (prop->type == P_SELECT) {
+					struct symbol *es = prop_get_symbol(prop);
+					es->rev_dep.expr = expr_alloc_or(es->rev_dep.expr,
+							expr_alloc_and(expr_alloc_symbol(menu->sym), expr_copy(dep)));
+				} else if (prop->type == P_IMPLY) {
+					struct symbol *es = prop_get_symbol(prop);
+					es->implied.expr = expr_alloc_or(es->implied.expr,
+							expr_alloc_and(expr_alloc_symbol(menu->sym), expr_copy(dep)));
+				}
+			}
+		}
+
+		if (sym && sym_is_choice(sym))
+			expr_free(parentdep);
+
+		/*
+		 * Recursively process children in the same fashion before
+		 * moving on
+		 */
+		for (menu = parent->list; menu; menu = menu->next)
+			menu_finalize(menu);
+	} else if (sym) {
+		/*
+		 * Automatic submenu creation. If sym is a symbol and A, B, C,
+		 * ... are consecutive items (symbols, menus, ifs, etc.) that
+		 * all depend on sym, then the following menu structure is
+		 * created:
+		 *
+		 *	sym
+		 *	 +-A
+		 *	 +-B
+		 *	 +-C
+		 *	 ...
+		 *
+		 * This also works recursively, giving the following structure
+		 * if A is a symbol and B depends on A:
+		 *
+		 *	sym
+		 *	 +-A
+		 *	 | +-B
+		 *	 +-C
+		 *	 ...
+		 */
+
+		basedep = parent->prompt ? parent->prompt->visible.expr : NULL;
+		basedep = expr_trans_compare(basedep, E_UNEQUAL, &symbol_no);
+		basedep = expr_eliminate_dups(expr_transform(basedep));
+
+		/* Examine consecutive elements after sym */
+		last_menu = NULL;
+		for (menu = parent->next; menu; menu = menu->next) {
+			dep = menu->prompt ? menu->prompt->visible.expr : menu->dep;
+			if (!expr_contains_symbol(dep, sym))
+				/* No dependency, quit */
+				break;
+			if (expr_depends_symbol(dep, sym))
+				/* Absolute dependency, put in submenu */
+				goto next;
+
+			/*
+			 * Also consider it a dependency on sym if our
+			 * dependencies contain sym and are a "superset" of
+			 * sym's dependencies, e.g. '(sym || Q) && R' when sym
+			 * depends on R.
+			 *
+			 * Note that 'R' might be from an enclosing menu or if,
+			 * making this a more common case than it might seem.
+			 */
+			dep = expr_trans_compare(dep, E_UNEQUAL, &symbol_no);
+			dep = expr_eliminate_dups(expr_transform(dep));
+			dep2 = expr_copy(basedep);
+			expr_eliminate_eq(&dep, &dep2);
+			expr_free(dep);
+			if (!expr_is_yes(dep2)) {
+				/* Not superset, quit */
+				expr_free(dep2);
+				break;
+			}
+			/* Superset, put in submenu */
+			expr_free(dep2);
+		next:
+			menu_finalize(menu);
+			menu->parent = parent;
+			last_menu = menu;
+		}
+		expr_free(basedep);
+		if (last_menu) {
+			parent->list = parent->next;
+			parent->next = last_menu->next;
+			last_menu->next = NULL;
+		}
+
+		sym->dir_dep.expr = expr_alloc_or(sym->dir_dep.expr, parent->dep);
+	}
+	for (menu = parent->list; menu; menu = menu->next) {
+		if (sym && sym_is_choice(sym) &&
+		    menu->sym && !sym_is_choice_value(menu->sym)) {
+			current_entry = menu;
+			menu->sym->flags |= SYMBOL_CHOICEVAL;
+			if (!menu->prompt)
+				menu_warn(menu, "choice value must have a prompt");
+			for (prop = menu->sym->prop; prop; prop = prop->next) {
+				if (prop->type == P_DEFAULT)
+					prop_warn(prop, "defaults for choice "
+						  "values not supported");
+				if (prop->menu == menu)
+					continue;
+				if (prop->type == P_PROMPT &&
+				    prop->menu->parent->sym != sym)
+					prop_warn(prop, "choice value used outside its choice group");
+			}
+			/* Non-tristate choice values of tristate choices must
+			 * depend on the choice being set to Y. The choice
+			 * values' dependencies were propagated to their
+			 * properties above, so the change here must be re-
+			 * propagated.
+			 */
+			if (sym->type == S_TRISTATE && menu->sym->type != S_TRISTATE) {
+				basedep = expr_alloc_comp(E_EQUAL, sym, &symbol_yes);
+				menu->dep = expr_alloc_and(basedep, menu->dep);
+				for (prop = menu->sym->prop; prop; prop = prop->next) {
+					if (prop->menu != menu)
+						continue;
+					prop->visible.expr = expr_alloc_and(expr_copy(basedep),
+									    prop->visible.expr);
+				}
+			}
+			menu_add_symbol(P_CHOICE, sym, NULL);
+			prop = sym_get_choice_prop(sym);
+			for (ep = &prop->expr; *ep; ep = &(*ep)->left.expr)
+				;
+			*ep = expr_alloc_one(E_LIST, NULL);
+			(*ep)->right.sym = menu->sym;
+		}
+
+		/*
+		 * This code serves two purposes:
+		 *
+		 * (1) Flattening 'if' blocks, which do not specify a submenu
+		 *     and only add dependencies.
+		 *
+		 *     (Automatic submenu creation might still create a submenu
+		 *     from an 'if' before this code runs.)
+		 *
+		 * (2) "Undoing" any automatic submenus created earlier below
+		 *     promptless symbols.
+		 *
+		 * Before:
+		 *
+		 *	A
+		 *	if ... (or promptless symbol)
+		 *	 +-B
+		 *	 +-C
+		 *	D
+		 *
+		 * After:
+		 *
+		 *	A
+		 *	if ... (or promptless symbol)
+		 *	B
+		 *	C
+		 *	D
+		 */
+		if (menu->list && (!menu->prompt || !menu->prompt->text)) {
+			for (last_menu = menu->list; ; last_menu = last_menu->next) {
+				last_menu->parent = parent;
+				if (!last_menu->next)
+					break;
+			}
+			last_menu->next = menu->next;
+			menu->next = menu->list;
+			menu->list = NULL;
+		}
+	}
+
+	if (sym && !(sym->flags & SYMBOL_WARNED)) {
+		if (sym->type == S_UNKNOWN)
+			menu_warn(parent, "config symbol defined without type");
+
+		if (sym_is_choice(sym) && !parent->prompt)
+			menu_warn(parent, "choice must have a prompt");
+
+		/* Check properties connected to this symbol */
+		sym_check_prop(sym);
+		sym->flags |= SYMBOL_WARNED;
+	}
+
+	/*
+	 * For non-optional choices, add a reverse dependency (corresponding to
+	 * a select) of '<visibility> && m'. This prevents the user from
+	 * setting the choice mode to 'n' when the choice is visible.
+	 *
+	 * This would also work for non-choice symbols, but only non-optional
+	 * choices clear SYMBOL_OPTIONAL as of writing. Choices are implemented
+	 * as a type of symbol.
+	 */
+	if (sym && !sym_is_optional(sym) && parent->prompt) {
+		sym->rev_dep.expr = expr_alloc_or(sym->rev_dep.expr,
+				expr_alloc_and(parent->prompt->visible.expr,
+					expr_alloc_symbol(&symbol_mod)));
+	}
+}
+
+bool menu_has_prompt(struct menu *menu)
+{
+	if (!menu->prompt)
+		return false;
+	return true;
+}
+
+/*
+ * Determine if a menu is empty.
+ * A menu is considered empty if it contains no or only
+ * invisible entries.
+ */
+bool menu_is_empty(struct menu *menu)
+{
+	struct menu *child;
+
+	for (child = menu->list; child; child = child->next) {
+		if (menu_is_visible(child))
+			return(false);
+	}
+	return(true);
+}
+
+bool menu_is_visible(struct menu *menu)
+{
+	struct menu *child;
+	struct symbol *sym;
+	tristate visible;
+
+	if (!menu->prompt)
+		return false;
+
+	if (menu->visibility) {
+		if (expr_calc_value(menu->visibility) == no)
+			return false;
+	}
+
+	sym = menu->sym;
+	if (sym) {
+		sym_calc_value(sym);
+		visible = menu->prompt->visible.tri;
+	} else
+		visible = menu->prompt->visible.tri = expr_calc_value(menu->prompt->visible.expr);
+
+	if (visible != no)
+		return true;
+
+	if (!sym || sym_get_tristate_value(menu->sym) == no)
+		return false;
+
+	for (child = menu->list; child; child = child->next) {
+		if (menu_is_visible(child)) {
+			if (sym)
+				sym->flags |= SYMBOL_DEF_USER;
+			return true;
+		}
+	}
+
+	return false;
+}
+
+const char *menu_get_prompt(struct menu *menu)
+{
+	if (menu->prompt)
+		return menu->prompt->text;
+	else if (menu->sym)
+		return menu->sym->name;
+	return NULL;
+}
+
+struct menu *menu_get_root_menu(struct menu *menu)
+{
+	return &rootmenu;
+}
+
+struct menu *menu_get_parent_menu(struct menu *menu)
+{
+	enum prop_type type;
+
+	for (; menu != &rootmenu; menu = menu->parent) {
+		type = menu->prompt ? menu->prompt->type : 0;
+		if (type == P_MENU)
+			break;
+	}
+	return menu;
+}
+
+bool menu_has_help(struct menu *menu)
+{
+	return menu->help != NULL;
+}
+
+const char *menu_get_help(struct menu *menu)
+{
+	if (menu->help)
+		return menu->help;
+	else
+		return "";
+}
+
+static void get_def_str(struct gstr *r, struct menu *menu)
+{
+	str_printf(r, "Defined at %s:%d\n",
+		   menu->file->name, menu->lineno);
+}
+
+static void get_dep_str(struct gstr *r, struct expr *expr, const char *prefix)
+{
+	if (!expr_is_yes(expr)) {
+		str_append(r, prefix);
+		expr_gstr_print(expr, r);
+		str_append(r, "\n");
+	}
+}
+
+static void get_prompt_str(struct gstr *r, struct property *prop,
+			   struct list_head *head)
+{
+	int i, j;
+	struct menu *submenu[8], *menu, *location = NULL;
+	struct jump_key *jump = NULL;
+
+	str_printf(r, "  Prompt: %s\n", prop->text);
+
+	get_dep_str(r, prop->menu->dep, "  Depends on: ");
+	/*
+	 * Most prompts in Linux have visibility that exactly matches their
+	 * dependencies. For these, we print only the dependencies to improve
+	 * readability. However, prompts with inline "if" expressions and
+	 * prompts with a parent that has a "visible if" expression have
+	 * differing dependencies and visibility. In these rare cases, we
+	 * print both.
+	 */
+	if (!expr_eq(prop->menu->dep, prop->visible.expr))
+		get_dep_str(r, prop->visible.expr, "  Visible if: ");
+
+	menu = prop->menu->parent;
+	for (i = 0; menu != &rootmenu && i < 8; menu = menu->parent) {
+		bool accessible = menu_is_visible(menu);
+
+		submenu[i++] = menu;
+		if (location == NULL && accessible)
+			location = menu;
+	}
+	if (head && location) {
+		jump = xmalloc(sizeof(struct jump_key));
+
+		if (menu_is_visible(prop->menu)) {
+			/*
+			 * There is not enough room to put the hint at the
+			 * beginning of the "Prompt" line. Put the hint on the
+			 * last "Location" line even when it would belong on
+			 * the former.
+			 */
+			jump->target = prop->menu;
+		} else
+			jump->target = location;
+
+		if (list_empty(head))
+			jump->index = 0;
+		else
+			jump->index = list_entry(head->prev, struct jump_key,
+						 entries)->index + 1;
+
+		list_add_tail(&jump->entries, head);
+	}
+
+	if (i > 0) {
+		str_printf(r, "  Location:\n");
+		for (j = 4; --i >= 0; j += 2) {
+			menu = submenu[i];
+			if (jump && menu == location)
+				jump->offset = strlen(r->s);
+			str_printf(r, "%*c-> %s", j, ' ',
+				   menu_get_prompt(menu));
+			if (menu->sym) {
+				str_printf(r, " (%s [=%s])", menu->sym->name ?
+					menu->sym->name : "<choice>",
+					sym_get_string_value(menu->sym));
+			}
+			str_append(r, "\n");
+		}
+	}
+}
+
+static void get_symbol_props_str(struct gstr *r, struct symbol *sym,
+				 enum prop_type tok, const char *prefix)
+{
+	bool hit = false;
+	struct property *prop;
+
+	for_all_properties(sym, prop, tok) {
+		if (!hit) {
+			str_append(r, prefix);
+			hit = true;
+		} else
+			str_printf(r, " && ");
+		expr_gstr_print(prop->expr, r);
+	}
+	if (hit)
+		str_append(r, "\n");
+}
+
+/*
+ * head is optional and may be NULL
+ */
+static void get_symbol_str(struct gstr *r, struct symbol *sym,
+		    struct list_head *head)
+{
+	struct property *prop;
+
+	if (sym && sym->name) {
+		str_printf(r, "Symbol: %s [=%s]\n", sym->name,
+			   sym_get_string_value(sym));
+		str_printf(r, "Type  : %s\n", sym_type_name(sym->type));
+		if (sym->type == S_INT || sym->type == S_HEX) {
+			prop = sym_get_range_prop(sym);
+			if (prop) {
+				str_printf(r, "Range : ");
+				expr_gstr_print(prop->expr, r);
+				str_append(r, "\n");
+			}
+		}
+	}
+
+	/* Print the definitions with prompts before the ones without */
+	for_all_properties(sym, prop, P_SYMBOL) {
+		if (prop->menu->prompt) {
+			get_def_str(r, prop->menu);
+			get_prompt_str(r, prop->menu->prompt, head);
+		}
+	}
+
+	for_all_properties(sym, prop, P_SYMBOL) {
+		if (!prop->menu->prompt) {
+			get_def_str(r, prop->menu);
+			get_dep_str(r, prop->menu->dep, "  Depends on: ");
+		}
+	}
+
+	get_symbol_props_str(r, sym, P_SELECT, "Selects: ");
+	if (sym->rev_dep.expr) {
+		expr_gstr_print_revdep(sym->rev_dep.expr, r, yes, "Selected by [y]:\n");
+		expr_gstr_print_revdep(sym->rev_dep.expr, r, mod, "Selected by [m]:\n");
+		expr_gstr_print_revdep(sym->rev_dep.expr, r, no, "Selected by [n]:\n");
+	}
+
+	get_symbol_props_str(r, sym, P_IMPLY, "Implies: ");
+	if (sym->implied.expr) {
+		expr_gstr_print_revdep(sym->implied.expr, r, yes, "Implied by [y]:\n");
+		expr_gstr_print_revdep(sym->implied.expr, r, mod, "Implied by [m]:\n");
+		expr_gstr_print_revdep(sym->implied.expr, r, no, "Implied by [n]:\n");
+	}
+
+	str_append(r, "\n\n");
+}
+
+struct gstr get_relations_str(struct symbol **sym_arr, struct list_head *head)
+{
+	struct symbol *sym;
+	struct gstr res = str_new();
+	int i;
+
+	for (i = 0; sym_arr && (sym = sym_arr[i]); i++)
+		get_symbol_str(&res, sym, head);
+	if (!i)
+		str_append(&res, "No matches found.\n");
+	return res;
+}
+
+
+void menu_get_ext_help(struct menu *menu, struct gstr *help)
+{
+	struct symbol *sym = menu->sym;
+	const char *help_text = nohelp_text;
+
+	if (menu_has_help(menu)) {
+		if (sym->name)
+			str_printf(help, "%s%s:\n\n", CONFIG_, sym->name);
+		help_text = menu_get_help(menu);
+	}
+	str_printf(help, "%s\n", help_text);
+	if (sym)
+		get_symbol_str(help, sym, NULL);
+}

nemu/tools/kconfig/parser.y

@@ -0,0 +1,727 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>
+ */
+%{
+
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdbool.h>
+
+#include "lkc.h"
+
+#define printd(mask, fmt...) if (cdebug & (mask)) printf(fmt)
+
+#define PRINTD		0x0001
+#define DEBUG_PARSE	0x0002
+
+int cdebug = PRINTD;
+
+static void yyerror(const char *err);
+static void zconfprint(const char *err, ...);
+static void zconf_error(const char *err, ...);
+static bool zconf_endtoken(const char *tokenname,
+			   const char *expected_tokenname);
+
+struct symbol *symbol_hash[SYMBOL_HASHSIZE];
+
+static struct menu *current_menu, *current_entry;
+
+%}
+
+%union
+{
+	char *string;
+	struct symbol *symbol;
+	struct expr *expr;
+	struct menu *menu;
+	enum symbol_type type;
+	enum variable_flavor flavor;
+}
+
+%token <string> T_HELPTEXT
+%token <string> T_WORD
+%token <string> T_WORD_QUOTE
+%token T_ALLNOCONFIG_Y
+%token T_BOOL
+%token T_CHOICE
+%token T_CLOSE_PAREN
+%token T_COLON_EQUAL
+%token T_COMMENT
+%token T_CONFIG
+%token T_DEFAULT
+%token T_DEFCONFIG_LIST
+%token T_DEF_BOOL
+%token T_DEF_TRISTATE
+%token T_DEPENDS
+%token T_ENDCHOICE
+%token T_ENDIF
+%token T_ENDMENU
+%token T_HELP
+%token T_HEX
+%token T_IF
+%token T_IMPLY
+%token T_INT
+%token T_MAINMENU
+%token T_MENU
+%token T_MENUCONFIG
+%token T_MODULES
+%token T_ON
+%token T_OPEN_PAREN
+%token T_OPTION
+%token T_OPTIONAL
+%token T_PLUS_EQUAL
+%token T_PROMPT
+%token T_RANGE
+%token T_SELECT
+%token T_SOURCE
+%token T_STRING
+%token T_TRISTATE
+%token T_VISIBLE
+%token T_EOL
+%token <string> T_ASSIGN_VAL
+
+%left T_OR
+%left T_AND
+%left T_EQUAL T_UNEQUAL
+%left T_LESS T_LESS_EQUAL T_GREATER T_GREATER_EQUAL
+%nonassoc T_NOT
+
+%type <symbol> nonconst_symbol
+%type <symbol> symbol
+%type <type> type logic_type default
+%type <expr> expr
+%type <expr> if_expr
+%type <string> end
+%type <menu> if_entry menu_entry choice_entry
+%type <string> word_opt assign_val
+%type <flavor> assign_op
+
+%destructor {
+	fprintf(stderr, "%s:%d: missing end statement for this entry\n",
+		$$->file->name, $$->lineno);
+	if (current_menu == $$)
+		menu_end_menu();
+} if_entry menu_entry choice_entry
+
+%%
+input: mainmenu_stmt stmt_list | stmt_list;
+
+/* mainmenu entry */
+
+mainmenu_stmt: T_MAINMENU T_WORD_QUOTE T_EOL
+{
+	menu_add_prompt(P_MENU, $2, NULL);
+};
+
+stmt_list:
+	  /* empty */
+	| stmt_list assignment_stmt
+	| stmt_list choice_stmt
+	| stmt_list comment_stmt
+	| stmt_list config_stmt
+	| stmt_list if_stmt
+	| stmt_list menu_stmt
+	| stmt_list menuconfig_stmt
+	| stmt_list source_stmt
+	| stmt_list T_WORD error T_EOL	{ zconf_error("unknown statement \"%s\"", $2); }
+	| stmt_list error T_EOL		{ zconf_error("invalid statement"); }
+;
+
+stmt_list_in_choice:
+	  /* empty */
+	| stmt_list_in_choice comment_stmt
+	| stmt_list_in_choice config_stmt
+	| stmt_list_in_choice if_stmt_in_choice
+	| stmt_list_in_choice error T_EOL	{ zconf_error("invalid statement"); }
+;
+
+/* config/menuconfig entry */
+
+config_entry_start: T_CONFIG nonconst_symbol T_EOL
+{
+	$2->flags |= SYMBOL_OPTIONAL;
+	menu_add_entry($2);
+	printd(DEBUG_PARSE, "%s:%d:config %s\n", zconf_curname(), zconf_lineno(), $2->name);
+};
+
+config_stmt: config_entry_start config_option_list
+{
+	printd(DEBUG_PARSE, "%s:%d:endconfig\n", zconf_curname(), zconf_lineno());
+};
+
+menuconfig_entry_start: T_MENUCONFIG nonconst_symbol T_EOL
+{
+	$2->flags |= SYMBOL_OPTIONAL;
+	menu_add_entry($2);
+	printd(DEBUG_PARSE, "%s:%d:menuconfig %s\n", zconf_curname(), zconf_lineno(), $2->name);
+};
+
+menuconfig_stmt: menuconfig_entry_start config_option_list
+{
+	if (current_entry->prompt)
+		current_entry->prompt->type = P_MENU;
+	else
+		zconfprint("warning: menuconfig statement without prompt");
+	printd(DEBUG_PARSE, "%s:%d:endconfig\n", zconf_curname(), zconf_lineno());
+};
+
+config_option_list:
+	  /* empty */
+	| config_option_list config_option
+	| config_option_list depends
+	| config_option_list help
+;
+
+config_option: type prompt_stmt_opt T_EOL
+{
+	menu_set_type($1);
+	printd(DEBUG_PARSE, "%s:%d:type(%u)\n",
+		zconf_curname(), zconf_lineno(),
+		$1);
+};
+
+config_option: T_PROMPT T_WORD_QUOTE if_expr T_EOL
+{
+	menu_add_prompt(P_PROMPT, $2, $3);
+	printd(DEBUG_PARSE, "%s:%d:prompt\n", zconf_curname(), zconf_lineno());
+};
+
+config_option: default expr if_expr T_EOL
+{
+	menu_add_expr(P_DEFAULT, $2, $3);
+	if ($1 != S_UNKNOWN)
+		menu_set_type($1);
+	printd(DEBUG_PARSE, "%s:%d:default(%u)\n",
+		zconf_curname(), zconf_lineno(),
+		$1);
+};
+
+config_option: T_SELECT nonconst_symbol if_expr T_EOL
+{
+	menu_add_symbol(P_SELECT, $2, $3);
+	printd(DEBUG_PARSE, "%s:%d:select\n", zconf_curname(), zconf_lineno());
+};
+
+config_option: T_IMPLY nonconst_symbol if_expr T_EOL
+{
+	menu_add_symbol(P_IMPLY, $2, $3);
+	printd(DEBUG_PARSE, "%s:%d:imply\n", zconf_curname(), zconf_lineno());
+};
+
+config_option: T_RANGE symbol symbol if_expr T_EOL
+{
+	menu_add_expr(P_RANGE, expr_alloc_comp(E_RANGE,$2, $3), $4);
+	printd(DEBUG_PARSE, "%s:%d:range\n", zconf_curname(), zconf_lineno());
+};
+
+config_option: T_OPTION T_MODULES T_EOL
+{
+	menu_add_option_modules();
+};
+
+config_option: T_OPTION T_DEFCONFIG_LIST T_EOL
+{
+	menu_add_option_defconfig_list();
+};
+
+config_option: T_OPTION T_ALLNOCONFIG_Y T_EOL
+{
+	menu_add_option_allnoconfig_y();
+};
+
+/* choice entry */
+
+choice: T_CHOICE word_opt T_EOL
+{
+	struct symbol *sym = sym_lookup($2, SYMBOL_CHOICE);
+	sym->flags |= SYMBOL_NO_WRITE;
+	menu_add_entry(sym);
+	menu_add_expr(P_CHOICE, NULL, NULL);
+	free($2);
+	printd(DEBUG_PARSE, "%s:%d:choice\n", zconf_curname(), zconf_lineno());
+};
+
+choice_entry: choice choice_option_list
+{
+	$$ = menu_add_menu();
+};
+
+choice_end: end
+{
+	if (zconf_endtoken($1, "choice")) {
+		menu_end_menu();
+		printd(DEBUG_PARSE, "%s:%d:endchoice\n", zconf_curname(), zconf_lineno());
+	}
+};
+
+choice_stmt: choice_entry stmt_list_in_choice choice_end
+;
+
+choice_option_list:
+	  /* empty */
+	| choice_option_list choice_option
+	| choice_option_list depends
+	| choice_option_list help
+;
+
+choice_option: T_PROMPT T_WORD_QUOTE if_expr T_EOL
+{
+	menu_add_prompt(P_PROMPT, $2, $3);
+	printd(DEBUG_PARSE, "%s:%d:prompt\n", zconf_curname(), zconf_lineno());
+};
+
+choice_option: logic_type prompt_stmt_opt T_EOL
+{
+	menu_set_type($1);
+	printd(DEBUG_PARSE, "%s:%d:type(%u)\n",
+	       zconf_curname(), zconf_lineno(), $1);
+};
+
+choice_option: T_OPTIONAL T_EOL
+{
+	current_entry->sym->flags |= SYMBOL_OPTIONAL;
+	printd(DEBUG_PARSE, "%s:%d:optional\n", zconf_curname(), zconf_lineno());
+};
+
+choice_option: T_DEFAULT nonconst_symbol if_expr T_EOL
+{
+	menu_add_symbol(P_DEFAULT, $2, $3);
+	printd(DEBUG_PARSE, "%s:%d:default\n",
+	       zconf_curname(), zconf_lineno());
+};
+
+type:
+	  logic_type
+	| T_INT			{ $$ = S_INT; }
+	| T_HEX			{ $$ = S_HEX; }
+	| T_STRING		{ $$ = S_STRING; }
+
+logic_type:
+	  T_BOOL		{ $$ = S_BOOLEAN; }
+	| T_TRISTATE		{ $$ = S_TRISTATE; }
+
+default:
+	  T_DEFAULT		{ $$ = S_UNKNOWN; }
+	| T_DEF_BOOL		{ $$ = S_BOOLEAN; }
+	| T_DEF_TRISTATE	{ $$ = S_TRISTATE; }
+
+/* if entry */
+
+if_entry: T_IF expr T_EOL
+{
+	printd(DEBUG_PARSE, "%s:%d:if\n", zconf_curname(), zconf_lineno());
+	menu_add_entry(NULL);
+	menu_add_dep($2);
+	$$ = menu_add_menu();
+};
+
+if_end: end
+{
+	if (zconf_endtoken($1, "if")) {
+		menu_end_menu();
+		printd(DEBUG_PARSE, "%s:%d:endif\n", zconf_curname(), zconf_lineno());
+	}
+};
+
+if_stmt: if_entry stmt_list if_end
+;
+
+if_stmt_in_choice: if_entry stmt_list_in_choice if_end
+;
+
+/* menu entry */
+
+menu: T_MENU T_WORD_QUOTE T_EOL
+{
+	menu_add_entry(NULL);
+	menu_add_prompt(P_MENU, $2, NULL);
+	printd(DEBUG_PARSE, "%s:%d:menu\n", zconf_curname(), zconf_lineno());
+};
+
+menu_entry: menu menu_option_list
+{
+	$$ = menu_add_menu();
+};
+
+menu_end: end
+{
+	if (zconf_endtoken($1, "menu")) {
+		menu_end_menu();
+		printd(DEBUG_PARSE, "%s:%d:endmenu\n", zconf_curname(), zconf_lineno());
+	}
+};
+
+menu_stmt: menu_entry stmt_list menu_end
+;
+
+menu_option_list:
+	  /* empty */
+	| menu_option_list visible
+	| menu_option_list depends
+;
+
+source_stmt: T_SOURCE T_WORD_QUOTE T_EOL
+{
+	printd(DEBUG_PARSE, "%s:%d:source %s\n", zconf_curname(), zconf_lineno(), $2);
+	zconf_nextfile($2);
+	free($2);
+};
+
+/* comment entry */
+
+comment: T_COMMENT T_WORD_QUOTE T_EOL
+{
+	menu_add_entry(NULL);
+	menu_add_prompt(P_COMMENT, $2, NULL);
+	printd(DEBUG_PARSE, "%s:%d:comment\n", zconf_curname(), zconf_lineno());
+};
+
+comment_stmt: comment comment_option_list
+;
+
+comment_option_list:
+	  /* empty */
+	| comment_option_list depends
+;
+
+/* help option */
+
+help_start: T_HELP T_EOL
+{
+	printd(DEBUG_PARSE, "%s:%d:help\n", zconf_curname(), zconf_lineno());
+	zconf_starthelp();
+};
+
+help: help_start T_HELPTEXT
+{
+	if (current_entry->help) {
+		free(current_entry->help);
+		zconfprint("warning: '%s' defined with more than one help text -- only the last one will be used",
+			   current_entry->sym->name ?: "<choice>");
+	}
+
+	/* Is the help text empty or all whitespace? */
+	if ($2[strspn($2, " \f\n\r\t\v")] == '\0')
+		zconfprint("warning: '%s' defined with blank help text",
+			   current_entry->sym->name ?: "<choice>");
+
+	current_entry->help = $2;
+};
+
+/* depends option */
+
+depends: T_DEPENDS T_ON expr T_EOL
+{
+	menu_add_dep($3);
+	printd(DEBUG_PARSE, "%s:%d:depends on\n", zconf_curname(), zconf_lineno());
+};
+
+/* visibility option */
+visible: T_VISIBLE if_expr T_EOL
+{
+	menu_add_visibility($2);
+};
+
+/* prompt statement */
+
+prompt_stmt_opt:
+	  /* empty */
+	| T_WORD_QUOTE if_expr
+{
+	menu_add_prompt(P_PROMPT, $1, $2);
+};
+
+end:	  T_ENDMENU T_EOL	{ $$ = "menu"; }
+	| T_ENDCHOICE T_EOL	{ $$ = "choice"; }
+	| T_ENDIF T_EOL		{ $$ = "if"; }
+;
+
+if_expr:  /* empty */			{ $$ = NULL; }
+	| T_IF expr			{ $$ = $2; }
+;
+
+expr:	  symbol				{ $$ = expr_alloc_symbol($1); }
+	| symbol T_LESS symbol			{ $$ = expr_alloc_comp(E_LTH, $1, $3); }
+	| symbol T_LESS_EQUAL symbol		{ $$ = expr_alloc_comp(E_LEQ, $1, $3); }
+	| symbol T_GREATER symbol		{ $$ = expr_alloc_comp(E_GTH, $1, $3); }
+	| symbol T_GREATER_EQUAL symbol		{ $$ = expr_alloc_comp(E_GEQ, $1, $3); }
+	| symbol T_EQUAL symbol			{ $$ = expr_alloc_comp(E_EQUAL, $1, $3); }
+	| symbol T_UNEQUAL symbol		{ $$ = expr_alloc_comp(E_UNEQUAL, $1, $3); }
+	| T_OPEN_PAREN expr T_CLOSE_PAREN	{ $$ = $2; }
+	| T_NOT expr				{ $$ = expr_alloc_one(E_NOT, $2); }
+	| expr T_OR expr			{ $$ = expr_alloc_two(E_OR, $1, $3); }
+	| expr T_AND expr			{ $$ = expr_alloc_two(E_AND, $1, $3); }
+;
+
+/* For symbol definitions, selects, etc., where quotes are not accepted */
+nonconst_symbol: T_WORD { $$ = sym_lookup($1, 0); free($1); };
+
+symbol:	  nonconst_symbol
+	| T_WORD_QUOTE	{ $$ = sym_lookup($1, SYMBOL_CONST); free($1); }
+;
+
+word_opt: /* empty */			{ $$ = NULL; }
+	| T_WORD
+
+/* assignment statement */
+
+assignment_stmt:  T_WORD assign_op assign_val T_EOL	{ variable_add($1, $3, $2); free($1); free($3); }
+
+assign_op:
+	  T_EQUAL	{ $$ = VAR_RECURSIVE; }
+	| T_COLON_EQUAL	{ $$ = VAR_SIMPLE; }
+	| T_PLUS_EQUAL	{ $$ = VAR_APPEND; }
+;
+
+assign_val:
+	/* empty */		{ $$ = xstrdup(""); };
+	| T_ASSIGN_VAL
+;
+
+%%
+
+void conf_parse(const char *name)
+{
+	struct symbol *sym;
+	int i;
+
+	zconf_initscan(name);
+
+	_menu_init();
+
+	if (getenv("ZCONF_DEBUG"))
+		yydebug = 1;
+	yyparse();
+
+	/* Variables are expanded in the parse phase. We can free them here. */
+	variable_all_del();
+
+	if (yynerrs)
+		exit(1);
+	if (!modules_sym)
+		modules_sym = sym_find( "n" );
+
+	if (!menu_has_prompt(&rootmenu)) {
+		current_entry = &rootmenu;
+		menu_add_prompt(P_MENU, "Main menu", NULL);
+	}
+
+	menu_finalize(&rootmenu);
+	for_all_symbols(i, sym) {
+		if (sym_check_deps(sym))
+			yynerrs++;
+	}
+	if (yynerrs)
+		exit(1);
+	sym_set_change_count(1);
+}
+
+static bool zconf_endtoken(const char *tokenname,
+			   const char *expected_tokenname)
+{
+	if (strcmp(tokenname, expected_tokenname)) {
+		zconf_error("unexpected '%s' within %s block",
+			    tokenname, expected_tokenname);
+		yynerrs++;
+		return false;
+	}
+	if (current_menu->file != current_file) {
+		zconf_error("'%s' in different file than '%s'",
+			    tokenname, expected_tokenname);
+		fprintf(stderr, "%s:%d: location of the '%s'\n",
+			current_menu->file->name, current_menu->lineno,
+			expected_tokenname);
+		yynerrs++;
+		return false;
+	}
+	return true;
+}
+
+static void zconfprint(const char *err, ...)
+{
+	va_list ap;
+
+	fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno());
+	va_start(ap, err);
+	vfprintf(stderr, err, ap);
+	va_end(ap);
+	fprintf(stderr, "\n");
+}
+
+static void zconf_error(const char *err, ...)
+{
+	va_list ap;
+
+	yynerrs++;
+	fprintf(stderr, "%s:%d: ", zconf_curname(), zconf_lineno());
+	va_start(ap, err);
+	vfprintf(stderr, err, ap);
+	va_end(ap);
+	fprintf(stderr, "\n");
+}
+
+static void yyerror(const char *err)
+{
+	fprintf(stderr, "%s:%d: %s\n", zconf_curname(), zconf_lineno() + 1, err);
+}
+
+static void print_quoted_string(FILE *out, const char *str)
+{
+	const char *p;
+	int len;
+
+	putc('"', out);
+	while ((p = strchr(str, '"'))) {
+		len = p - str;
+		if (len)
+			fprintf(out, "%.*s", len, str);
+		fputs("\\\"", out);
+		str = p + 1;
+	}
+	fputs(str, out);
+	putc('"', out);
+}
+
+static void print_symbol(FILE *out, struct menu *menu)
+{
+	struct symbol *sym = menu->sym;
+	struct property *prop;
+
+	if (sym_is_choice(sym))
+		fprintf(out, "\nchoice\n");
+	else
+		fprintf(out, "\nconfig %s\n", sym->name);
+	switch (sym->type) {
+	case S_BOOLEAN:
+		fputs("  bool\n", out);
+		break;
+	case S_TRISTATE:
+		fputs("  tristate\n", out);
+		break;
+	case S_STRING:
+		fputs("  string\n", out);
+		break;
+	case S_INT:
+		fputs("  integer\n", out);
+		break;
+	case S_HEX:
+		fputs("  hex\n", out);
+		break;
+	default:
+		fputs("  ???\n", out);
+		break;
+	}
+	for (prop = sym->prop; prop; prop = prop->next) {
+		if (prop->menu != menu)
+			continue;
+		switch (prop->type) {
+		case P_PROMPT:
+			fputs("  prompt ", out);
+			print_quoted_string(out, prop->text);
+			if (!expr_is_yes(prop->visible.expr)) {
+				fputs(" if ", out);
+				expr_fprint(prop->visible.expr, out);
+			}
+			fputc('\n', out);
+			break;
+		case P_DEFAULT:
+			fputs( "  default ", out);
+			expr_fprint(prop->expr, out);
+			if (!expr_is_yes(prop->visible.expr)) {
+				fputs(" if ", out);
+				expr_fprint(prop->visible.expr, out);
+			}
+			fputc('\n', out);
+			break;
+		case P_CHOICE:
+			fputs("  #choice value\n", out);
+			break;
+		case P_SELECT:
+			fputs( "  select ", out);
+			expr_fprint(prop->expr, out);
+			fputc('\n', out);
+			break;
+		case P_IMPLY:
+			fputs( "  imply ", out);
+			expr_fprint(prop->expr, out);
+			fputc('\n', out);
+			break;
+		case P_RANGE:
+			fputs( "  range ", out);
+			expr_fprint(prop->expr, out);
+			fputc('\n', out);
+			break;
+		case P_MENU:
+			fputs( "  menu ", out);
+			print_quoted_string(out, prop->text);
+			fputc('\n', out);
+			break;
+		case P_SYMBOL:
+			fputs( "  symbol ", out);
+			fprintf(out, "%s\n", prop->menu->sym->name);
+			break;
+		default:
+			fprintf(out, "  unknown prop %d!\n", prop->type);
+			break;
+		}
+	}
+	if (menu->help) {
+		int len = strlen(menu->help);
+		while (menu->help[--len] == '\n')
+			menu->help[len] = 0;
+		fprintf(out, "  help\n%s\n", menu->help);
+	}
+}
+
+void zconfdump(FILE *out)
+{
+	struct property *prop;
+	struct symbol *sym;
+	struct menu *menu;
+
+	menu = rootmenu.list;
+	while (menu) {
+		if ((sym = menu->sym))
+			print_symbol(out, menu);
+		else if ((prop = menu->prompt)) {
+			switch (prop->type) {
+			case P_COMMENT:
+				fputs("\ncomment ", out);
+				print_quoted_string(out, prop->text);
+				fputs("\n", out);
+				break;
+			case P_MENU:
+				fputs("\nmenu ", out);
+				print_quoted_string(out, prop->text);
+				fputs("\n", out);
+				break;
+			default:
+				;
+			}
+			if (!expr_is_yes(prop->visible.expr)) {
+				fputs("  depends ", out);
+				expr_fprint(prop->visible.expr, out);
+				fputc('\n', out);
+			}
+		}
+
+		if (menu->list)
+			menu = menu->list;
+		else if (menu->next)
+			menu = menu->next;
+		else while ((menu = menu->parent)) {
+			if (menu->prompt && menu->prompt->type == P_MENU)
+				fputs("\nendmenu\n", out);
+			if (menu->next) {
+				menu = menu->next;
+				break;
+			}
+		}
+	}
+}
+
+#include "menu.c"

nemu/tools/kconfig/preprocess.c

@@ -0,0 +1,574 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (C) 2018 Masahiro Yamada <yamada.masahiro@socionext.com>
+
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "list.h"
+#include "lkc.h"
+
+#define ARRAY_SIZE(arr)		(sizeof(arr) / sizeof((arr)[0]))
+
+static char *expand_string_with_args(const char *in, int argc, char *argv[]);
+static char *expand_string(const char *in);
+
+static void __attribute__((noreturn)) pperror(const char *format, ...)
+{
+	va_list ap;
+
+	fprintf(stderr, "%s:%d: ", current_file->name, yylineno);
+	va_start(ap, format);
+	vfprintf(stderr, format, ap);
+	va_end(ap);
+	fprintf(stderr, "\n");
+
+	exit(1);
+}
+
+/*
+ * Environment variables
+ */
+static LIST_HEAD(env_list);
+
+struct env {
+	char *name;
+	char *value;
+	struct list_head node;
+};
+
+static void env_add(const char *name, const char *value)
+{
+	struct env *e;
+
+	e = xmalloc(sizeof(*e));
+	e->name = xstrdup(name);
+	e->value = xstrdup(value);
+
+	list_add_tail(&e->node, &env_list);
+}
+
+static void env_del(struct env *e)
+{
+	list_del(&e->node);
+	free(e->name);
+	free(e->value);
+	free(e);
+}
+
+/* The returned pointer must be freed when done */
+static char *env_expand(const char *name)
+{
+	struct env *e;
+	const char *value;
+
+	if (!*name)
+		return NULL;
+
+	list_for_each_entry(e, &env_list, node) {
+		if (!strcmp(name, e->name))
+			return xstrdup(e->value);
+	}
+
+	value = getenv(name);
+	if (!value)
+		return NULL;
+
+	/*
+	 * We need to remember all referenced environment variables.
+	 * They will be written out to include/config/auto.conf.cmd
+	 */
+	env_add(name, value);
+
+	return xstrdup(value);
+}
+
+void env_write_dep(FILE *f, const char *autoconfig_name)
+{
+	struct env *e, *tmp;
+
+	list_for_each_entry_safe(e, tmp, &env_list, node) {
+		fprintf(f, "ifneq \"$(%s)\" \"%s\"\n", e->name, e->value);
+		fprintf(f, "%s: FORCE\n", autoconfig_name);
+		fprintf(f, "endif\n");
+		env_del(e);
+	}
+}
+
+/*
+ * Built-in functions
+ */
+struct function {
+	const char *name;
+	unsigned int min_args;
+	unsigned int max_args;
+	char *(*func)(int argc, char *argv[]);
+};
+
+static char *do_error_if(int argc, char *argv[])
+{
+	if (!strcmp(argv[0], "y"))
+		pperror("%s", argv[1]);
+
+	return xstrdup("");
+}
+
+static char *do_filename(int argc, char *argv[])
+{
+	return xstrdup(current_file->name);
+}
+
+static char *do_info(int argc, char *argv[])
+{
+	printf("%s\n", argv[0]);
+
+	return xstrdup("");
+}
+
+static char *do_lineno(int argc, char *argv[])
+{
+	char buf[16];
+
+	sprintf(buf, "%d", yylineno);
+
+	return xstrdup(buf);
+}
+
+static char *do_shell(int argc, char *argv[])
+{
+	FILE *p;
+	char buf[256];
+	char *cmd;
+	size_t nread;
+	int i;
+
+	cmd = argv[0];
+
+	p = popen(cmd, "r");
+	if (!p) {
+		perror(cmd);
+		exit(1);
+	}
+
+	nread = fread(buf, 1, sizeof(buf), p);
+	if (nread == sizeof(buf))
+		nread--;
+
+	/* remove trailing new lines */
+	while (nread > 0 && buf[nread - 1] == '\n')
+		nread--;
+
+	buf[nread] = 0;
+
+	/* replace a new line with a space */
+	for (i = 0; i < nread; i++) {
+		if (buf[i] == '\n')
+			buf[i] = ' ';
+	}
+
+	if (pclose(p) == -1) {
+		perror(cmd);
+		exit(1);
+	}
+
+	return xstrdup(buf);
+}
+
+static char *do_warning_if(int argc, char *argv[])
+{
+	if (!strcmp(argv[0], "y"))
+		fprintf(stderr, "%s:%d: %s\n",
+			current_file->name, yylineno, argv[1]);
+
+	return xstrdup("");
+}
+
+static const struct function function_table[] = {
+	/* Name		MIN	MAX	Function */
+	{ "error-if",	2,	2,	do_error_if },
+	{ "filename",	0,	0,	do_filename },
+	{ "info",	1,	1,	do_info },
+	{ "lineno",	0,	0,	do_lineno },
+	{ "shell",	1,	1,	do_shell },
+	{ "warning-if",	2,	2,	do_warning_if },
+};
+
+#define FUNCTION_MAX_ARGS		16
+
+static char *function_expand(const char *name, int argc, char *argv[])
+{
+	const struct function *f;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(function_table); i++) {
+		f = &function_table[i];
+		if (strcmp(f->name, name))
+			continue;
+
+		if (argc < f->min_args)
+			pperror("too few function arguments passed to '%s'",
+				name);
+
+		if (argc > f->max_args)
+			pperror("too many function arguments passed to '%s'",
+				name);
+
+		return f->func(argc, argv);
+	}
+
+	return NULL;
+}
+
+/*
+ * Variables (and user-defined functions)
+ */
+static LIST_HEAD(variable_list);
+
+struct variable {
+	char *name;
+	char *value;
+	enum variable_flavor flavor;
+	int exp_count;
+	struct list_head node;
+};
+
+static struct variable *variable_lookup(const char *name)
+{
+	struct variable *v;
+
+	list_for_each_entry(v, &variable_list, node) {
+		if (!strcmp(name, v->name))
+			return v;
+	}
+
+	return NULL;
+}
+
+static char *variable_expand(const char *name, int argc, char *argv[])
+{
+	struct variable *v;
+	char *res;
+
+	v = variable_lookup(name);
+	if (!v)
+		return NULL;
+
+	if (argc == 0 && v->exp_count)
+		pperror("Recursive variable '%s' references itself (eventually)",
+			name);
+
+	if (v->exp_count > 1000)
+		pperror("Too deep recursive expansion");
+
+	v->exp_count++;
+
+	if (v->flavor == VAR_RECURSIVE)
+		res = expand_string_with_args(v->value, argc, argv);
+	else
+		res = xstrdup(v->value);
+
+	v->exp_count--;
+
+	return res;
+}
+
+void variable_add(const char *name, const char *value,
+		  enum variable_flavor flavor)
+{
+	struct variable *v;
+	char *new_value;
+	bool append = false;
+
+	v = variable_lookup(name);
+	if (v) {
+		/* For defined variables, += inherits the existing flavor */
+		if (flavor == VAR_APPEND) {
+			flavor = v->flavor;
+			append = true;
+		} else {
+			free(v->value);
+		}
+	} else {
+		/* For undefined variables, += assumes the recursive flavor */
+		if (flavor == VAR_APPEND)
+			flavor = VAR_RECURSIVE;
+
+		v = xmalloc(sizeof(*v));
+		v->name = xstrdup(name);
+		v->exp_count = 0;
+		list_add_tail(&v->node, &variable_list);
+	}
+
+	v->flavor = flavor;
+
+	if (flavor == VAR_SIMPLE)
+		new_value = expand_string(value);
+	else
+		new_value = xstrdup(value);
+
+	if (append) {
+		v->value = xrealloc(v->value,
+				    strlen(v->value) + strlen(new_value) + 2);
+		strcat(v->value, " ");
+		strcat(v->value, new_value);
+		free(new_value);
+	} else {
+		v->value = new_value;
+	}
+}
+
+static void variable_del(struct variable *v)
+{
+	list_del(&v->node);
+	free(v->name);
+	free(v->value);
+	free(v);
+}
+
+void variable_all_del(void)
+{
+	struct variable *v, *tmp;
+
+	list_for_each_entry_safe(v, tmp, &variable_list, node)
+		variable_del(v);
+}
+
+/*
+ * Evaluate a clause with arguments.  argc/argv are arguments from the upper
+ * function call.
+ *
+ * Returned string must be freed when done
+ */
+static char *eval_clause(const char *str, size_t len, int argc, char *argv[])
+{
+	char *tmp, *name, *res, *endptr, *prev, *p;
+	int new_argc = 0;
+	char *new_argv[FUNCTION_MAX_ARGS];
+	int nest = 0;
+	int i;
+	unsigned long n;
+
+	tmp = xstrndup(str, len);
+
+	/*
+	 * If variable name is '1', '2', etc.  It is generally an argument
+	 * from a user-function call (i.e. local-scope variable).  If not
+	 * available, then look-up global-scope variables.
+	 */
+	n = strtoul(tmp, &endptr, 10);
+	if (!*endptr && n > 0 && n <= argc) {
+		res = xstrdup(argv[n - 1]);
+		goto free_tmp;
+	}
+
+	prev = p = tmp;
+
+	/*
+	 * Split into tokens
+	 * The function name and arguments are separated by a comma.
+	 * For example, if the function call is like this:
+	 *   $(foo,$(x),$(y))
+	 *
+	 * The input string for this helper should be:
+	 *   foo,$(x),$(y)
+	 *
+	 * and split into:
+	 *   new_argv[0] = 'foo'
+	 *   new_argv[1] = '$(x)'
+	 *   new_argv[2] = '$(y)'
+	 */
+	while (*p) {
+		if (nest == 0 && *p == ',') {
+			*p = 0;
+			if (new_argc >= FUNCTION_MAX_ARGS)
+				pperror("too many function arguments");
+			new_argv[new_argc++] = prev;
+			prev = p + 1;
+		} else if (*p == '(') {
+			nest++;
+		} else if (*p == ')') {
+			nest--;
+		}
+
+		p++;
+	}
+	new_argv[new_argc++] = prev;
+
+	/*
+	 * Shift arguments
+	 * new_argv[0] represents a function name or a variable name.  Put it
+	 * into 'name', then shift the rest of the arguments.  This simplifies
+	 * 'const' handling.
+	 */
+	name = expand_string_with_args(new_argv[0], argc, argv);
+	new_argc--;
+	for (i = 0; i < new_argc; i++)
+		new_argv[i] = expand_string_with_args(new_argv[i + 1],
+						      argc, argv);
+
+	/* Search for variables */
+	res = variable_expand(name, new_argc, new_argv);
+	if (res)
+		goto free;
+
+	/* Look for built-in functions */
+	res = function_expand(name, new_argc, new_argv);
+	if (res)
+		goto free;
+
+	/* Last, try environment variable */
+	if (new_argc == 0) {
+		res = env_expand(name);
+		if (res)
+			goto free;
+	}
+
+	res = xstrdup("");
+free:
+	for (i = 0; i < new_argc; i++)
+		free(new_argv[i]);
+	free(name);
+free_tmp:
+	free(tmp);
+
+	return res;
+}
+
+/*
+ * Expand a string that follows '$'
+ *
+ * For example, if the input string is
+ *     ($(FOO)$($(BAR)))$(BAZ)
+ * this helper evaluates
+ *     $($(FOO)$($(BAR)))
+ * and returns a new string containing the expansion (note that the string is
+ * recursively expanded), also advancing 'str' to point to the next character
+ * after the corresponding closing parenthesis, in this case, *str will be
+ *     $(BAR)
+ */
+static char *expand_dollar_with_args(const char **str, int argc, char *argv[])
+{
+	const char *p = *str;
+	const char *q;
+	int nest = 0;
+
+	/*
+	 * In Kconfig, variable/function references always start with "$(".
+	 * Neither single-letter variables as in $A nor curly braces as in ${CC}
+	 * are supported.  '$' not followed by '(' loses its special meaning.
+	 */
+	if (*p != '(') {
+		*str = p;
+		return xstrdup("$");
+	}
+
+	p++;
+	q = p;
+	while (*q) {
+		if (*q == '(') {
+			nest++;
+		} else if (*q == ')') {
+			if (nest-- == 0)
+				break;
+		}
+		q++;
+	}
+
+	if (!*q)
+		pperror("unterminated reference to '%s': missing ')'", p);
+
+	/* Advance 'str' to after the expanded initial portion of the string */
+	*str = q + 1;
+
+	return eval_clause(p, q - p, argc, argv);
+}
+
+char *expand_dollar(const char **str)
+{
+	return expand_dollar_with_args(str, 0, NULL);
+}
+
+static char *__expand_string(const char **str, bool (*is_end)(char c),
+			     int argc, char *argv[])
+{
+	const char *in, *p;
+	char *expansion, *out;
+	size_t in_len, out_len;
+
+	out = xmalloc(1);
+	*out = 0;
+	out_len = 1;
+
+	p = in = *str;
+
+	while (1) {
+		if (*p == '$') {
+			in_len = p - in;
+			p++;
+			expansion = expand_dollar_with_args(&p, argc, argv);
+			out_len += in_len + strlen(expansion);
+			out = xrealloc(out, out_len);
+			strncat(out, in, in_len);
+			strcat(out, expansion);
+			free(expansion);
+			in = p;
+			continue;
+		}
+
+		if (is_end(*p))
+			break;
+
+		p++;
+	}
+
+	in_len = p - in;
+	out_len += in_len;
+	out = xrealloc(out, out_len);
+	strncat(out, in, in_len);
+
+	/* Advance 'str' to the end character */
+	*str = p;
+
+	return out;
+}
+
+static bool is_end_of_str(char c)
+{
+	return !c;
+}
+
+/*
+ * Expand variables and functions in the given string.  Undefined variables
+ * expand to an empty string.
+ * The returned string must be freed when done.
+ */
+static char *expand_string_with_args(const char *in, int argc, char *argv[])
+{
+	return __expand_string(&in, is_end_of_str, argc, argv);
+}
+
+static char *expand_string(const char *in)
+{
+	return expand_string_with_args(in, 0, NULL);
+}
+
+static bool is_end_of_token(char c)
+{
+	return !(isalnum(c) || c == '_' || c == '-');
+}
+
+/*
+ * Expand variables in a token.  The parsing stops when a token separater
+ * (in most cases, it is a whitespace) is encountered.  'str' is updated to
+ * point to the next character.
+ *
+ * The returned string must be freed when done.
+ */
+char *expand_one_token(const char **str)
+{
+	return __expand_string(str, is_end_of_token, 0, NULL);
+}

nemu/tools/kconfig/util.c

@@ -0,0 +1,129 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2002-2005 Roman Zippel <zippel@linux-m68k.org>
+ * Copyright (C) 2002-2005 Sam Ravnborg <sam@ravnborg.org>
+ */
+
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include "lkc.h"
+
+/* file already present in list? If not add it */
+struct file *file_lookup(const char *name)
+{
+	struct file *file;
+
+	for (file = file_list; file; file = file->next) {
+		if (!strcmp(name, file->name)) {
+			return file;
+		}
+	}
+
+	file = xmalloc(sizeof(*file));
+	memset(file, 0, sizeof(*file));
+	file->name = xstrdup(name);
+	file->next = file_list;
+	file_list = file;
+	return file;
+}
+
+/* Allocate initial growable string */
+struct gstr str_new(void)
+{
+	struct gstr gs;
+	gs.s = xmalloc(sizeof(char) * 64);
+	gs.len = 64;
+	gs.max_width = 0;
+	strcpy(gs.s, "\0");
+	return gs;
+}
+
+/* Free storage for growable string */
+void str_free(struct gstr *gs)
+{
+	if (gs->s)
+		free(gs->s);
+	gs->s = NULL;
+	gs->len = 0;
+}
+
+/* Append to growable string */
+void str_append(struct gstr *gs, const char *s)
+{
+	size_t l;
+	if (s) {
+		l = strlen(gs->s) + strlen(s) + 1;
+		if (l > gs->len) {
+			gs->s = xrealloc(gs->s, l);
+			gs->len = l;
+		}
+		strcat(gs->s, s);
+	}
+}
+
+/* Append printf formatted string to growable string */
+void str_printf(struct gstr *gs, const char *fmt, ...)
+{
+	va_list ap;
+	char s[10000]; /* big enough... */
+	va_start(ap, fmt);
+	vsnprintf(s, sizeof(s), fmt, ap);
+	str_append(gs, s);
+	va_end(ap);
+}
+
+/* Retrieve value of growable string */
+const char *str_get(struct gstr *gs)
+{
+	return gs->s;
+}
+
+void *xmalloc(size_t size)
+{
+	void *p = malloc(size);
+	if (p)
+		return p;
+	fprintf(stderr, "Out of memory.\n");
+	exit(1);
+}
+
+void *xcalloc(size_t nmemb, size_t size)
+{
+	void *p = calloc(nmemb, size);
+	if (p)
+		return p;
+	fprintf(stderr, "Out of memory.\n");
+	exit(1);
+}
+
+void *xrealloc(void *p, size_t size)
+{
+	p = realloc(p, size);
+	if (p)
+		return p;
+	fprintf(stderr, "Out of memory.\n");
+	exit(1);
+}
+
+char *xstrdup(const char *s)
+{
+	char *p;
+
+	p = strdup(s);
+	if (p)
+		return p;
+	fprintf(stderr, "Out of memory.\n");
+	exit(1);
+}
+
+char *xstrndup(const char *s, size_t n)
+{
+	char *p;
+
+	p = strndup(s, n);
+	if (p)
+		return p;
+	fprintf(stderr, "Out of memory.\n");
+	exit(1);
+}