path: root/scripts/kconfig/conf.c

// 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/time.h>
#include <errno.h>

#include "internal.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,
	mod2noconfig,
};
static enum input_mode input_mode = oldaskconfig;
static int input_mode_opt;
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 void set_randconfig_seed(void)
{
	unsigned int seed;
	char *env;
	bool seed_set = false;

	env = getenv("KCONFIG_SEED");
	if (env && *env) {
		char *endp;

		seed = strtol(env, &endp, 0);
		if (*endp == '\0')
			seed_set = true;
	}

	if (!seed_set) {
		struct timeval now;

		/*
		 * Use microseconds derived seed, compensate for systems where it may
		 * be zero.
		 */
		gettimeofday(&now, NULL);
		seed = (now.tv_sec + 1) * (now.tv_usec + 1);
	}

	printf("KCONFIG_SEED=0x%X\n", seed);
	srand(seed);
}

/**
 * randomize_choice_values - randomize choice block
 *
 * @choice: menu entry for the choice
 */
static void randomize_choice_values(struct menu *choice)
{
	struct menu *menu;
	int x;
	int cnt = 0;

	/*
	 * First, count the number of symbols to randomize. If sym_has_value()
	 * is true, it was specified by KCONFIG_ALLCONFIG. It needs to be
	 * respected.
	 */
	menu_for_each_sub_entry(menu, choice) {
		struct symbol *sym = menu->sym;

		if (sym && !sym_has_value(sym))
			cnt++;
	}

	while (cnt > 0) {
		x = rand() % cnt;

		menu_for_each_sub_entry(menu, choice) {
			struct symbol *sym = menu->sym;

			if (sym && !sym_has_value(sym))
				x--;

			if (x < 0) {
				sym->def[S_DEF_USER].tri = yes;
				sym->flags |= SYMBOL_DEF_USER;
				/*
				 * Move the selected item to the _tail_ because
				 * this needs to have a lower priority than the
				 * user input from KCONFIG_ALLCONFIG.
				 */
				list_move_tail(&sym->choice_link,
					       &choice->choice_members);

				break;
			}
		}
		cnt--;
	}
}

enum conf_def_mode {
	def_default,
	def_yes,
	def_mod,
	def_no,
	def_random
};

static void conf_set_all_new_symbols(enum conf_def_mode mode)
{
	struct menu *menu;
	int cnt;
	/*
	 * can't go as the default in switch-case below, otherwise gcc whines
	 * about -Wmaybe-uninitialized
	 */
	int pby = 50; /* probability of bool     = y */
	int pty = 33; /* probability of tristate = y */
	int ptm = 33; /* probability of tristate = m */

	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