#include "config.h"

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <fcntl.h>

#include <errno.h>

#include <sys/ioctl.h>

#include <linux/kd.h>

#include "nls.h"

#include "getfd.h"

static char *conspath[] = {

	"/proc/self/fd/0",

	"/dev/tty",

	"/dev/tty0",

	"/dev/vc/0",

	"/dev/systty",

	"/dev/console",

	NULL

};

/*

 * getfd.c

 *

 * Get an fd for use with kbd/console ioctls.

 * We try several things because opening /dev/console will fail

 * if someone else used X (which does a chown on /dev/console).

 */

static int

is_a_console(int fd)

{

	char arg;

	arg = 0;

	return (isatty(fd) && ioctl(fd, KDGKBTYPE, &arg) == 0 && ((arg == KB_101) || (arg == KB_84)));

}

static int

open_a_console(const char *fnam)

{

	int fd;

	/*

	 * For ioctl purposes we only need some fd and permissions

	 * do not matter. But setfont:activatemap() does a write.

	 */

	fd = open(fnam, O_RDWR);

	if (fd < 0)

		fd = open(fnam, O_WRONLY);

	if (fd < 0)

		fd = open(fnam, O_RDONLY);

	if (fd < 0)

		return -1;

	return fd;

}

int getfd(const char *fnam)

{

	int fd, i;

	if (fnam) {

		if ((fd = open_a_console(fnam)) >= 0) {

			if (is_a_console(fd))

				return fd;

			close(fd);

		}

		fprintf(stderr, _("Couldn't open %s\n"), fnam);

		exit(1);

	}

	for (i = 0; conspath[i]; i++) {

		if ((fd = open_a_console(conspath[i])) >= 0) {

			if (is_a_console(fd))

				return fd;

			close(fd);

		}

	}

	for (fd = 0; fd < 3; fd++)

		if (is_a_console(fd))

			return fd;

	fprintf(stderr,

	        _("Couldn't get a file descriptor referring to the console\n"));

	/* total failure */

	exit(1);

}