busybox/coreutils/mknod.c

/* vi: set sw=4 ts=4: */
/*
 * mknod implementation for busybox
 *
 * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

/* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */

#include <sys/sysmacros.h>  // For makedev

#include "libbb.h"
#include "libcoreutils/coreutils.h"

static const char modes_chars[] ALIGN1 = { 'p', 'c', 'u', 'b', 0, 1, 1, 2 };
static const mode_t modes_cubp[] = { S_IFIFO, S_IFCHR, S_IFBLK };

int mknod_main(int argc, char **argv);
int mknod_main(int argc, char **argv)
{
	mode_t mode;
	dev_t dev;
	const char *name;

	mode = getopt_mk_fifo_nod(argc, argv);
	argv += optind;
	argc -= optind;

	if ((argc >= 2) && ((name = strchr(modes_chars, argv[1][0])) != NULL)) {
		mode |= modes_cubp[(int)(name[4])];

		dev = 0;
		if ((*name != 'p') && ((argc -= 2) == 2)) {
			/* Autodetect what the system supports; these macros should
			 * optimize out to two constants. */
			dev = makedev(xatoul_range(argv[2], 0, major(UINT_MAX)),
			              xatoul_range(argv[3], 0, minor(UINT_MAX)));
		}

		if (argc == 2) {
			name = *argv;
			if (mknod(name, mode, dev) == 0) {
				return EXIT_SUCCESS;
			}
			bb_simple_perror_msg_and_die(name);
		}
	}
	bb_show_usage();
}