confdata.c

	if (!name)
		name = "include/config/tristate.conf";
	if (rename(".tmpconfig_tristate", name))
		return 1;
	name = conf_get_autoconfig_name();
	/*
	 * This must be the last step, kbuild has a dependency on auto.conf
	 * and this marks the successful completion of the previous steps.
	 */
	if (rename(".tmpconfig", name))
		return 1;

	return 0;
}

static int sym_change_count;
static void (*conf_changed_callback)(void);

void sym_set_change_count(int count)
{
	int _sym_change_count = sym_change_count;
	sym_change_count = count;
	if (conf_changed_callback &&
	    (bool)_sym_change_count != (bool)count)
		conf_changed_callback();
}

void sym_add_change_count(int count)
{
	sym_set_change_count(count + sym_change_count);
}

bool conf_get_changed(void)
{
	return sym_change_count;
}

void conf_set_changed_callback(void (*fn)(void))
{
	conf_changed_callback = fn;
}

static void randomize_choice_values(struct symbol *csym)
{
	struct property *prop;
	struct symbol *sym;
	struct expr *e;
	int cnt, def;

	/*
	 * If choice is mod then we may have more items selected
	 * and if no then no-one.
	 * In both cases stop.
	 */
	if (csym->curr.tri != yes)
		return;

	prop = sym_get_choice_prop(csym);

	/* count entries in choice block */
	cnt = 0;
	expr_list_for_each_sym(prop->expr, e, sym)
		cnt++;

	/*
	 * find a random value and set it to yes,
	 * set the rest to no so we have only one set
	 */
	def = (rand() % cnt);

	cnt = 0;
	expr_list_for_each_sym(prop->expr, e, sym) {
		if (def == cnt++) {
			sym->def[S_DEF_USER].tri = yes;
			csym->def[S_DEF_USER].val = sym;
		}
		else {
			sym->def[S_DEF_USER].tri = no;
		}
	}
	csym->flags |= SYMBOL_DEF_USER;
	/* clear VALID to get value calculated */
	csym->flags &= ~(SYMBOL_VALID);
}

static void set_all_choice_values(struct symbol *csym)
{
	struct property *prop;
	struct symbol *sym;
	struct expr *e;

	prop = sym_get_choice_prop(csym);

	/*
	 * Set all non-assinged choice values to no
	 */
	expr_list_for_each_sym(prop->expr, e, sym) {
		if (!sym_has_value(sym))
			sym->def[S_DEF_USER].tri = no;
	}
	csym->flags |= SYMBOL_DEF_USER;
	/* clear VALID to get value calculated */
	csym->flags &= ~(SYMBOL_VALID);
}

void conf_set_all_new_symbols(enum conf_def_mode mode)
{
	struct symbol *sym, *csym;
	int i, cnt, pby, pty, ptm;	/* pby: probability of boolean  = y
					 * pty: probability of tristate = y
					 * ptm: probability of tristate = m
					 */

	pby = 50; pty = ptm = 33; /* can't go as the default in switch-case
				   * below, otherwise gcc whines about
				   * -Wmaybe-uninitialized */
	if (mode == def_random) {
		int n, p[3];
		char *env = getenv("KCONFIG_PROBABILITY");
		n = 0;
		while( env && *env ) {
			char *endp;
			int tmp = strtol( env, &endp, 10 );
			if( tmp >= 0 && tmp <= 100 ) {
				p[n++] = tmp;
			} else {
				errno = ERANGE;
				perror( "KCONFIG_PROBABILITY" );
				exit( 1 );
			}
			env = (*endp == ':') ? endp+1 : endp;
			if( n >=3 ) {
				break;
			}
		}
		switch( n ) {
		case 1:
			pby = p[0]; ptm = pby/2; pty = pby-ptm;
			break;
		case 2:
			pty = p[0]; ptm = p[1]; pby = pty + ptm;
			break;
		case 3:
			pby = p[0]; pty = p[1]; ptm = p[2];
			break;
		}

		if( pty+ptm > 100 ) {
			errno = ERANGE;
			perror( "KCONFIG_PROBABILITY" );
			exit( 1 );
		}
	}

	for_all_symbols(i, sym) {
		if (sym_has_value(sym) || (sym->flags & SYMBOL_VALID))
			continue;
		switch (sym_get_type(sym)) {
		case S_BOOLEAN:
		case S_TRISTATE:
			switch (mode) {
			case def_yes:
				sym->def[S_DEF_USER].tri = yes;
				break;
			case def_mod:
				sym->def[S_DEF_USER].tri = mod;
				break;
			case def_no:
				sym->def[S_DEF_USER].tri = no;
				break;
			case def_random:
				sym->def[S_DEF_USER].tri = no;
				cnt = rand() % 100;
				if (sym->type == S_TRISTATE) {
					if (cnt < pty)
						sym->def[S_DEF_USER].tri = yes;
					else if (cnt < (pty+ptm))
						sym->def[S_DEF_USER].tri = mod;
				} else if (cnt < pby)
					sym->def[S_DEF_USER].tri = yes;
				break;
			default:
				continue;
			}
			if (!(sym_is_choice(sym) && mode == def_random))
				sym->flags |= SYMBOL_DEF_USER;
			break;
		default:
			break;
		}

	}

	sym_clear_all_valid();

	/*
	 * We have different type of choice blocks.
	 * If curr.tri equals to mod then we can select several
	 * choice symbols in one block.
	 * In this case we do nothing.
	 * If curr.tri equals yes then only one symbol can be
	 * selected in a choice block and we set it to yes,
	 * and the rest to no.
	 */
	for_all_symbols(i, csym) {
		if (sym_has_value(csym) || !sym_is_choice(csym))
			continue;

		sym_calc_value(csym);
		if (mode == def_random)
			randomize_choice_values(csym);
		else
			set_all_choice_values(csym);
	}
}