/*

 * Copyright (C) 2002 Roman Zippel <zippel@linux-m68k.org>

 * Released under the terms of the GNU GPL v2.0.

 */

#include <ctype.h>

#include <stdlib.h>

#include <string.h>

#include <regex.h>

#include <sys/utsname.h>

#define LKC_DIRECT_LINK

#include "lkc.h"

struct symbol symbol_yes = {

	.name = "y",

	.curr = { "y", yes },

	.flags = SYMBOL_CONST|SYMBOL_VALID,

}, symbol_mod = {

	.name = "m",

	.curr = { "m", mod },

	.flags = SYMBOL_CONST|SYMBOL_VALID,

}, symbol_no = {

	.name = "n",

	.curr = { "n", no },

	.flags = SYMBOL_CONST|SYMBOL_VALID,

}, symbol_empty = {

	.name = "",

	.curr = { "", no },

	.flags = SYMBOL_VALID,

};

struct symbol *sym_defconfig_list;

struct symbol *modules_sym;

tristate modules_val;

struct expr *sym_env_list;

static void sym_add_default(struct symbol *sym, const char *def)

{

	struct property *prop = prop_alloc(P_DEFAULT, sym);

	prop->expr = expr_alloc_symbol(sym_lookup(def, SYMBOL_CONST));

}

void sym_init(void)

{

	struct symbol *sym;

	struct utsname uts;

	static bool inited = false;

	if (inited)

		return;

	inited = true;

	uname(&uts);

	sym = sym_lookup("UNAME_RELEASE", 0);

	sym->type = S_STRING;

	sym->flags |= SYMBOL_AUTO;

	sym_add_default(sym, uts.release);

}

enum symbol_type sym_get_type(struct symbol *sym)

{

	enum symbol_type type = sym->type;

	if (type == S_TRISTATE) {

		if (sym_is_choice_value(sym) && sym->visible == yes)

			type = S_BOOLEAN;

		else if (modules_val == no)

			type = S_BOOLEAN;

	}

	return type;

}

const char *sym_type_name(enum symbol_type type)

{

	switch (type) {

	case S_BOOLEAN:

		return "boolean";

	case S_TRISTATE:

		return "tristate";

	case S_INT:

		return "integer";

	case S_HEX:

		return "hex";

	case S_STRING:

		return "string";

	case S_UNKNOWN:

		return "unknown";

	case S_OTHER:

		break;

	}

	return "???";

}

struct property *sym_get_choice_prop(struct symbol *sym)

{

	struct property *prop;

	for_all_choices(sym, prop)

		return prop;

	return NULL;

}

struct property *sym_get_env_prop(struct symbol *sym)

{

	struct property *prop;

	for_all_properties(sym, prop, P_ENV)

		return prop;

	return NULL;

}

struct property *sym_get_default_prop(struct symbol *sym)

{

	struct property *prop;

	for_all_defaults(sym, prop) {

		prop->visible.tri = expr_calc_value(prop->visible.expr);

		if (prop->visible.tri != no)

			return prop;

	}

	return NULL;

}

static struct property *sym_get_range_prop(struct symbol *sym)

{

	struct property *prop;

	for_all_properties(sym, prop, P_RANGE) {

		prop->visible.tri = expr_calc_value(prop->visible.expr);

		if (prop->visible.tri != no)

			return prop;

	}

	return NULL;

}

static int sym_get_range_val(struct symbol *sym, int base)

{

	sym_calc_value(sym);

	switch (sym->type) {

	case S_INT:

		base = 10;

		break;

	case S_HEX:

		base = 16;

		break;

	default:

		break;

	}

	return strtol(sym->curr.val, NULL, base);

}

static void sym_validate_range(struct symbol *sym)

{

	struct property *prop;

	int base, val, val2;

	char str[64];

	switch (sym->type) {

	case S_INT:

		base = 10;

		break;

	case S_HEX:

		base = 16;

		break;

	default:

		return;

	}

	prop = sym_get_range_prop(sym);

	if (!prop)

		return;

	val = strtol(sym->curr.val, NULL, base);

	val2 = sym_get_range_val(prop->expr->left.sym, base);

	if (val >= val2) {

		val2 = sym_get_range_val(prop->expr->right.sym, base);

		if (val <= val2)

			return;

	}

	if (sym->type == S_INT)

		sprintf(str, "%d", val2);

	else

		sprintf(str, "0x%x", val2);

	sym->curr.val = strdup(str);

}

static void sym_calc_visibility(struct symbol *sym)

{

	struct property *prop;

	tristate tri;

	/* any prompt visible? */

	tri = no;

	for_all_prompts(sym, prop) {

		prop->visible.tri = expr_calc_value(prop->visible.expr);

		tri = EXPR_OR(tri, prop->visible.tri);

	}

	if (tri == mod && (sym->type != S_TRISTATE || modules_val == no))

		tri = yes;

	if (sym->visible != tri) {

		sym->visible = tri;

		sym_set_changed(sym);

	}

	if (sym_is_choice_value(sym))

		return;

	/* defaulting to "yes" if no explicit "depends on" are given */

	tri = yes;

	if (sym->dir_dep.expr)

		tri = expr_calc_value(sym->dir_dep.expr);

	if (tri == mod)

		tri = yes;

	if (sym->dir_dep.tri != tri) {

		sym->dir_dep.tri = tri;

		sym_set_changed(sym);

	}

	tri = no;

	if (sym->rev_dep.expr)

		tri = expr_calc_value(sym->rev_dep.expr);

	if (tri == mod && sym_get_type(sym) == S_BOOLEAN)

		tri = yes;

	if (sym->rev_dep.tri != tri) {

		sym->rev_dep.tri = tri;

		sym_set_changed(sym);

	}

}

/*

 * Find the default symbol for a choice.

 * First try the default values for the choice symbol

 * Next locate the first visible choice value

 * Return NULL if none was found

 */

struct symbol *sym_choice_default(struct symbol *sym)

{

	struct symbol *def_sym;

	struct property *prop;

	struct expr *e;

	/* any of the defaults visible? */

	for_all_defaults(sym, prop) {

		prop->visible.tri = expr_calc_value(prop->visible.expr);

		if (prop->visible.tri == no)

			continue;

		def_sym = prop_get_symbol(prop);

		if (def_sym->visible != no)

			return def_sym;

	}

	/* just get the first visible value */

	prop = sym_get_choice_prop(sym);

	expr_list_for_each_sym(prop->expr, e, def_sym)

		if (def_sym->visible != no)

			return def_sym;

	/* failed to locate any defaults */

	return NULL;

}

static struct symbol *sym_calc_choice(struct symbol *sym)

{

	struct symbol *def_sym;

	struct property *prop;

	struct expr *e;

	/* first calculate all choice values' visibilities */

	prop = sym_get_choice_prop(sym);

	expr_list_for_each_sym(prop->expr, e, def_sym)

		sym_calc_visibility(def_sym);

	/* is the user choice visible? */

	def_sym = sym->def[S_DEF_USER].val;

	if (def_sym && def_sym->visible != no)

		return def_sym;

	def_sym = sym_choice_default(sym);

	if (def_sym == NULL)

		/* no choice? reset tristate value */

		sym->curr.tri = no;

	return def_sym;

}

void sym_calc_value(struct symbol *sym)

{

	struct symbol_value newval, oldval;

	struct property *prop;

	struct expr *e;

	if (!sym)

		return;

	if (sym->flags & SYMBOL_VALID)

		return;

	sym->flags |= SYMBOL_VALID;

	oldval = sym->curr;

	switch (sym->type) {

	case S_INT:

	case S_HEX:

	case S_STRING:

		newval = symbol_empty.curr;

		break;

	case S_BOOLEAN:

	case S_TRISTATE:

		newval = symbol_no.curr;

		break;

	default:

		sym->curr.val = sym->name;

		sym->curr.tri = no;

		return;

	}

	if (!sym_is_choice_value(sym))

		sym->flags &= ~SYMBOL_WRITE;

	sym_calc_visibility(sym);

	/* set default if recursively called */

	sym->curr = newval;

	switch (sym_get_type(sym)) {

	case S_BOOLEAN:

	case S_TRISTATE:

		if (sym_is_choice_value(sym) && sym->visible == yes) {

			prop = sym_get_choice_prop(sym);

			newval.tri = (prop_get_symbol(prop)->curr.val == sym) ? yes : no;

		} else {

			if (sym->visible != no) {

				/* if the symbol is visible use the user value

				 * if available, otherwise try the default value

				 */

				sym->flags |= SYMBOL_WRITE;

				if (sym_has_value(sym)) {

					newval.tri = EXPR_AND(sym->def[S_DEF_USER].tri,

							      sym->visible);

					goto calc_newval;

				}

			}

			if (sym->rev_dep.tri != no)

				sym->flags |= SYMBOL_WRITE;

			if (!sym_is_choice(sym)) {

				prop = sym_get_default_prop(sym);

				if (prop) {

					sym->flags |= SYMBOL_WRITE;

					newval.tri = EXPR_AND(expr_calc_value(prop->expr),

							      prop->visible.tri);

				}

			}

		calc_newval:

			if (sym->dir_dep.tri == no && sym->rev_dep.tri != no) {

				struct expr *e;

				e = expr_simplify_unmet_dep(sym->rev_dep.expr,

				    sym->dir_dep.expr);

				fprintf(stderr, "warning: (");

				expr_fprint(e, stderr);

				fprintf(stderr, ") selects %s which has unmet direct dependencies (",

					sym->name);

				expr_fprint(sym->dir_dep.expr, stderr);

				fprintf(stderr, ")\n");

				expr_free(e);

			}

			newval.tri = EXPR_OR(newval.tri, sym->rev_dep.tri);

		}

		if (newval.tri == mod && sym_get_type(sym) == S_BOOLEAN)

			newval.tri = yes;

		break;

	case S_STRING:

	case S_HEX:

	case S_INT:

		if (sym->visible != no) {

			sym->flags |= SYMBOL_WRITE;

			if (sym_has_value(sym)) {

				newval.val = sym->def[S_DEF_USER].val;

				break;

			}

		}

		prop = sym_get_default_prop(sym);

		if (prop) {

			struct symbol *ds = prop_get_symbol(prop);

			if (ds) {

				sym->flags |= SYMBOL_WRITE;

				sym_calc_value(ds);

				newval.val = ds->curr.val;

			}

		}

		break;

	default:

		;

	}

	sym->curr = newval;

	if (sym_is_choice(sym) && newval.tri == yes)

		sym->curr.val = sym_calc_choice(sym);

	sym_validate_range(sym);

	if (memcmp(&oldval, &sym->curr, sizeof(oldval))) {

		sym_set_changed(sym);

		if (modules_sym == sym) {

			sym_set_all_changed();

			modules_val = modules_sym->curr.tri;

		}

	}

	if (sym_is_choice(sym)) {

		struct symbol *choice_sym;

		prop = sym_get_choice_prop(sym);

		expr_list_for_each_sym(prop->expr, e, choice_sym) {

			if ((sym->flags & SYMBOL_WRITE) &&

			    choice_sym->visible != no)

				choice_sym->flags |= SYMBOL_WRITE;

			if (sym->flags & SYMBOL_CHANGED)

				sym_set_changed(choice_sym);

		}

	}

	if (sym->flags & SYMBOL_AUTO)

		sym->flags &= ~SYMBOL_WRITE;

}

void sym_clear_all_valid(void)

{

	struct symbol *sym;

	int i;

	for_all_symbols(i, sym)

		sym->flags &= ~SYMBOL_VALID;

	sym_add_change_count(1);

	if (modules_sym)

		sym_calc_value(modules_sym);

}

void sym_set_changed(struct symbol *sym)

{

	struct property *prop;

	sym->flags |= SYMBOL_CHANGED;

	for (prop = sym->prop; prop; prop = prop->next) {

		if (prop->menu)

			prop->menu->flags |= MENU_CHANGED;

	}

}

void sym_set_all_changed(void)

{

	struct symbol *sym;

	int i;

	for_all_symbols(i, sym)

		sym_set_changed(sym);

}

bool sym_tristate_within_range(struct symbol *sym, tristate val)

{

	int type = sym_get_type(sym);

	if (sym->visible == no)

		return false;

	if (type != S_BOOLEAN && type != S_TRISTATE)

		return false;

	if (type == S_BOOLEAN && val == mod)

		return false;

	if (sym->visible <= sym->rev_dep.tri)

		return false;

	if (sym_is_choice_value(sym) && sym->visible == yes)

		return val == yes;

	return val >= sym->rev_dep.tri && val <= sym->visible;

}

bool sym_set_tristate_value(struct symbol *sym, tristate val)

{

	tristate oldval = sym_get_tristate_value(sym);

	if (oldval != val && !sym_tristate_within_range(sym, val))

		return false;

	if (!(sym->flags & SYMBOL_DEF_USER)) {

		sym->flags |= SYMBOL_DEF_USER;

		sym_set_changed(sym);

	}

	/*

	 * setting a choice value also resets the new flag of the choice

	 * symbol and all other choice values.

	 */

	if (sym_is_choice_value(sym) && val == yes) {

		struct symbol *cs = prop_get_symbol(sym_get_choice_prop(sym));

		struct property *prop;

		struct expr *e;

		cs->def[S_DEF_USER].val = sym;

		cs->flags |= SYMBOL_DEF_USER;

		prop = sym_get_choice_prop(cs);

		for (e = prop->expr; e; e = e->left.expr) {

			if (e->right.sym->visible != no)

				e->right.sym->flags |= SYMBOL_DEF_USER;

		}

	}

	sym->def[S_DEF_USER].tri = val;

	if (oldval != val)

		sym_clear_all_valid();

	return true;

}

tristate sym_toggle_tristate_value(struct symbol *sym)

{

	tristate oldval, newval;

	oldval = newval = sym_get_tristate_value(sym);

	do {

		switch (newval) {

		case no:

			newval = mod;

			break;

		case mod:

			newval = yes;

			break;

		case yes:

			newval = no;

			break;

		}

		if (sym_set_tristate_value(sym, newval))

			break;

	} while (oldval != newval);

	return newval;

}

bool sym_string_valid(struct symbol *sym, const char *str)

{

	signed char ch;

	switch (sym->type) {

	case S_STRING:

		return true;

	case S_INT:

		ch = *str++;

		if (ch == '-')

			ch = *str++;

		if (!isdigit(ch))

			return false;

		if (ch == '0' && *str != 0)

			return false;

		while ((ch = *str++)) {

			if (!isdigit(ch))

				return false;

		}

		return true;

	case S_HEX:

		if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X'))

			str += 2;

		ch = *str++;

		do {

			if (!isxdigit(ch))

				return false;

		} while ((ch = *str++));

		return true;

	case S_BOOLEAN:

	case S_TRISTATE:

		switch (str[0]) {

		case 'y': case 'Y':

		case 'm': case 'M':

		case 'n': case 'N':

			return true;

		}

		return false;

	default:

		return false;

	}

}

bool sym_string_within_range(struct symbol *sym, const char *str)

{

	struct property *prop;

	int val;

	switch (sym->type) {

	case S_STRING:

		return sym_string_valid(sym, str);

	case S_INT:

		if (!sym_string_valid(sym, str))

			return false;

		prop = sym_get_range_prop(sym);

		if (!prop)

			return true;

		val = strtol(str, NULL, 10);

		return val >= sym_get_range_val(prop->expr->left.sym, 10) &&

		       val <= sym_get_range_val(prop->expr->right.sym, 10);

	case S_HEX:

		if (!sym_string_valid(sym, str))

			return false;

		prop = sym_get_range_prop(sym);

		if (!prop)

			return true;

		val = strtol(str, NULL, 16);

		return val >= sym_get_range_val(prop->expr->left.sym, 16) &&

		       val <= sym_get_range_val(prop->expr->right.sym, 16);

	case S_BOOLEAN:

	case S_TRISTATE:

		switch (str[0]) {

		case 'y': case 'Y':

			return sym_tristate_within_range(sym, yes);

		case 'm': case 'M':

			return sym_tristate_within_range(sym, mod);

		case 'n': case 'N':

			return sym_tristate_within_range(sym, no);

		}

		return false;

	default:

		return false;

	}

}

bool sym_set_string_value(struct symbol *sym, const char *newval)

{

	const char *oldval;

	char *val;

	int size;

	switch (sym->type) {

	case S_BOOLEAN:

	case S_TRISTATE:

		switch (newval[0]) {

		case 'y': case 'Y':

			return sym_set_tristate_value(sym, yes);

		case 'm': case 'M':

			return sym_set_tristate_value(sym, mod);

		case 'n': case 'N':

			return sym_set_tristate_value(sym, no);

		}

		return false;

	default:

		;

	}

	if (!sym_string_within_range(sym, newval))

		return false;

	if (!(sym->flags & SYMBOL_DEF_USER)) {

		sym->flags |= SYMBOL_DEF_USER;

		sym_set_changed(sym);

	}

	oldval = sym->def[S_DEF_USER].val;

	size = strlen(newval) + 1;

	if (sym->type == S_HEX && (newval[0] != '0' || (newval[1] != 'x' && newval[1] != 'X'))) {

		size += 2;

		sym->def[S_DEF_USER].val = val = malloc(size);

		*val++ = '0';

		*val++ = 'x';

	} else if (!oldval || strcmp(oldval, newval))

		sym->def[S_DEF_USER].val = val = malloc(size);

	else

		return true;

	strcpy(val, newval);

	free((void *)oldval);

	sym_clear_all_valid();

	return true;

}

/*

 * Find the default value associated to a symbol.

 * For tristate symbol handle the modules=n case

 * in which case "m" becomes "y".

 * If the symbol does not have any default then fallback

 * to the fixed default values.

 */

const char *sym_get_string_default(struct symbol *sym)

{

	struct property *prop;

	struct symbol *ds;

	const char *str;

	tristate val;

	sym_calc_visibility(sym);

	sym_calc_value(modules_sym);

	val = symbol_no.curr.tri;

	str = symbol_empty.curr.val;

	/* If symbol has a default value look it up */

	prop = sym_get_default_prop(sym);

	if (prop != NULL) {

		switch (sym->type) {

		case S_BOOLEAN:

		case S_TRISTATE:

			/* The visibility may limit the value from yes => mod */

			val = EXPR_AND(expr_calc_value(prop->expr), prop->visible.tri);

			break;

		default:

			/*

			 * The following fails to handle the situation

			 * where a default value is further limited by

			 * the valid range.

			 */

			ds = prop_get_symbol(prop);

			if (ds != NULL) {

				sym_calc_value(ds);

				str = (const char *)ds->curr.val;

			}

		}

	}

	/* Handle select statements */

	val = EXPR_OR(val, sym->rev_dep.tri);

	/* transpose mod to yes if modules are not enabled */

	if (val == mod)

		if (!sym_is_choice_value(sym) && modules_sym->curr.tri == no)

			val = yes;

	/* transpose mod to yes if type is bool */

	if (sym->type == S_BOOLEAN && val == mod)

		val = yes;

	switch (sym->type) {

	case S_BOOLEAN:

	case S_TRISTATE:

		switch (val) {

		case no: return "n";

		case mod: return "m";

		case yes: return "y";

		}

	case S_INT:

	case S_HEX:

		return str;

	case S_STRING:

		return str;

	case S_OTHER:

	case S_UNKNOWN:

		break;

	}

	return "";

}

const char *sym_get_string_value(struct symbol *sym)

{

	tristate val;

	switch (sym->type) {

	case S_BOOLEAN:

	case S_TRISTATE:

		val = sym_get_tristate_value(sym);

		switch (val) {

		case no:

			return "n";

		case mod:

			return "m";

		case yes:

			return "y";

		}

		break;

	default:

		;

	}

	return (const char *)sym->curr.val;

}

bool sym_is_changable(struct symbol *sym)

{

	return sym->visible > sym->rev_dep.tri;

}

static unsigned strhash(const char *s)

{

	/* fnv32 hash */

	unsigned hash = 2166136261U;

	for (; *s; s++)

		hash = (hash ^ *s) * 0x01000193;

	return hash;

}

struct symbol *sym_lookup(const char *name, int flags)

{

	struct symbol *symbol;

	char *new_name;

	int hash;

	if (name) {

		if (name[0] && !name[1]) {

			switch (name[0]) {

			case 'y': return &symbol_yes;

			case 'm': return &symbol_mod;

			case 'n': return &symbol_no;

			}

		}

		hash = strhash(name) % SYMBOL_HASHSIZE;

		for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {

			if (symbol->name &&

			    !strcmp(symbol->name, name) &&

			    (flags ? symbol->flags & flags

				   : !(symbol->flags & (SYMBOL_CONST|SYMBOL_CHOICE))))

				return symbol;

		}

		new_name = strdup(name);

	} else {

		new_name = NULL;

		hash = 0;

	}

	symbol = malloc(sizeof(*symbol));

	memset(symbol, 0, sizeof(*symbol));

	symbol->name = new_name;

	symbol->type = S_UNKNOWN;

	symbol->flags |= flags;

	symbol->next = symbol_hash[hash];

	symbol_hash[hash] = symbol;

	return symbol;

}

struct symbol *sym_find(const char *name)

{

	struct symbol *symbol = NULL;

	int hash = 0;

	if (!name)

		return NULL;

	if (name[0] && !name[1]) {

		switch (name[0]) {

		case 'y': return &symbol_yes;

		case 'm': return &symbol_mod;

		case 'n': return &symbol_no;

		}

	}

	hash = strhash(name) % SYMBOL_HASHSIZE;

	for (symbol = symbol_hash[hash]; symbol; symbol = symbol->next) {

		if (symbol->name &&

		    !strcmp(symbol->name, name) &&

		    !(symbol->flags & SYMBOL_CONST))

				break;

	}

	return symbol;

}

/*

 * Expand symbol's names embedded in the string given in argument. Symbols'

 * name to be expanded shall be prefixed by a '$'. Unknown symbol expands to

 * the empty string.

 */

const char *sym_expand_string_value(const char *in)

{

	const char *src;

	char *res;

	size_t reslen;

	reslen = strlen(in) + 1;

	res = malloc(reslen);

	res[0] = '\0';

	while ((src = strchr(in, '$'))) {

		char *p, name[SYMBOL_MAXLENGTH];

		const char *symval = "";

		struct symbol *sym;

		size_t newlen;

		strncat(res, in, src - in);

		src++;

		p = name;

		while (isalnum(*src) || *src == '_')

			*p++ = *src++;

		*p = '\0';

		sym = sym_find(name);

		if (sym != NULL) {

			sym_calc_value(sym);

			symval = sym_get_string_value(sym);

		}

		newlen = strlen(res) + strlen(symval) + strlen(src) + 1;

		if (newlen > reslen) {

			reslen = newlen;

			res = realloc(res, reslen);

		}

		strcat(res, symval);

		in = src;

	}

	strcat(res, in);

	return res;

}

struct symbol **sym_re_search(const char *pattern)

{

	struct symbol *sym, **sym_arr = NULL;

	int i, cnt, size;

	regex_t re;

	cnt = size = 0;

	/* Skip if empty */

	if (strlen(pattern) == 0)

		return NULL;

	if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))

		return NULL;

	for_all_symbols(i, sym) {

		if (sym->flags & SYMBOL_CONST || !sym->name)

			continue;

		if (regexec(&re, sym->name, 0, NULL, 0))

			continue;

		if (cnt + 1 >= size) {

			void *tmp = sym_arr;

			size += 16;

			sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));

			if (!sym_arr) {

				free(tmp);

				return NULL;

			}

		}

		sym_calc_value(sym);

		sym_arr[cnt++] = sym;

	}

	if (sym_arr)

		sym_arr[cnt] = NULL;

	regfree(&re);

	return sym_arr;

}

/*

 * When we check for recursive dependencies we use a stack to save

 * current state so we can print out relevant info to user.

 * The entries are located on the call stack so no need to free memory.

 * Note inser() remove() must always match to properly clear the stack.

 */

static struct dep_stack {

	struct dep_stack *prev, *next;

	struct symbol *sym;

	struct property *prop;

	struct expr *expr;

} *check_top;

static void dep_stack_insert(struct dep_stack *stack, struct symbol *sym)

{

	memset(stack, 0, sizeof(*stack));

	if (check_top)

		check_top->next = stack;

	stack->prev = check_top;

	stack->sym = sym;

	check_top = stack;

}

static void dep_stack_remove(void)

{

	check_top = check_top->prev;

	if (check_top)

		check_top->next = NULL;

}

/*

 * Called when we have detected a recursive dependency.

 * check_top point to the top of the stact so we use

 * the ->prev pointer to locate the bottom of the stack.

 */

static void sym_check_print_recursive(struct symbol *last_sym)

{

	struct dep_stack *stack;

	struct symbol *sym, *next_sym;

	struct menu *menu = NULL;

	struct property *prop;

	struct dep_stack cv_stack;

	if (sym_is_choice_value(last_sym)) {

		dep_stack_insert(&cv_stack, last_sym);

		last_sym = prop_get_symbol(sym_get_choice_prop(last_sym));

	}

	for (stack = check_top; stack != NULL; stack = stack->prev)

		if (stack->sym == last_sym)

			break;

	if (!stack) {

		fprintf(stderr, "unexpected recursive dependency error\n");

		return;

	}

	for (; stack; stack = stack->next) {

		sym = stack->sym;

		next_sym = stack->next ? stack->next->sym : last_sym;

		prop = stack->prop;