#include <sys/efiio.h>
#include <sys/ioctl.h>

#include <err.h>
#include <fcntl.h>
#include <limits.h>
#include <locale.h>
#include <stdio.h>
#include <string.h>
#include <uchar.h>
#include <util.h>

#define	EFI_PAGE_SHIFT		12
#define	EFI_PAGE_SIZE		(1 << EFI_PAGE_SHIFT)
#define	EFI_VARNAME_MAXLENGTH	EFI_PAGE_SIZE

int
main(void)
{
	int efifd;
	struct efi_var_ioc ev;
	char buf[MB_LEN_MAX];
	mbstate_t ps;
	size_t i, n;

	if (setlocale(LC_CTYPE, "C.UTF-8") == NULL)
		err(1, "setlocale(LC_CTYPE, \"C.UTF-8\")");

	efifd = open("/dev/efi", O_RDWR);
	if (efifd == -1)
		err(1, "open");

	memset(&ev, 0, sizeof(ev));
	ev.name = ecalloc(EFI_VARNAME_MAXLENGTH, sizeof(*ev.name));
	ev.namesize = EFI_VARNAME_MAXLENGTH;
	if (ioctl(efifd, EFIIOC_VAR_NEXT, &ev) == -1)
		err(1, "ioctl(EFIIOC_VAR_NEXT)");

	memset(&ps, 0, sizeof(ps));
	for (i = 0; i < ev.namesize; i++) {
		if (ev.name[i] == U'\0')
			break;
		n = c16rtomb(buf, ev.name[i], &ps);
		if (n == (size_t)-1)
			err(1, "c16rtomb");
		if (fwrite(buf, n, 1, stdout) != 1)
			err(1, "fwrite");
	}
	printf("\n");
	fflush(stdout);
	return ferror(stdout);
}