micro-utils/src/coreutils/mknod/mknod.c

#ifdef __linux__
#include <sys/sysmacros.h>
#endif

#include <sys/stat.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include "parse_mode.h"

long parse_long(const char *str) {
	char *ptr = NULL;
	long value = strtol(str, &ptr, 10);

	if (*ptr) {
		fprintf(stderr, "mknod: not a number: %s\n", str);
		exit(1);
	}

	else if (value < 0) {
		fprintf(stderr, "mknod: number is negative: %s\n", str);
		exit(1);
	}

	return value;
}

int main(int argc, char **argv) {
	mode_t mode = 0666;

	int opt;
	while ((opt = getopt(argc, argv, "m:")) != -1) {
		switch (opt) {
			case 'm':
				mode = mu_parse_mode(optarg, 0);
				break;

			default:
				printf("mknod [m] [NAME] [TYPE] [MAJOR MINOR]\n\t-m MODE\n\n");
				printf("Types:\n\tb - block device\n\tc or u - character device\n\tp - named pipe/fifo (MAJOR MINOR must be omitted)\n\ts - socket\n");
				return 0;
		}
	}

	argv += optind;
	argc -= optind;
	if (argc <= 1) {
		fprintf(stderr, "mknod: missing operand\n");
		return 1;
	}

	dev_t dev = 0;
	if (argc == 4)
		dev = makedev(parse_long(argv[2]), parse_long(argv[3]));

	if (!strncmp("b", argv[1], 1))
		mode |= S_IFBLK;

	else if (!strncmp("c", argv[1], 1) || !strncmp("u", argv[1], 1))
		mode |= S_IFCHR;

	else if (!strncmp("p", argv[1], 1))
		mode |= S_IFIFO;

	else if (!strncmp("s", argv[1], 1))
		mode |= S_IFSOCK;

	else {
		fprintf(stderr, "mknod: unknow file type\n");
		return 1;
	}

	if (mknod(argv[0], mode, dev) < 0) {
		fprintf(stderr, "mknod: %s\n", strerror(errno));
		return 1;
	}

	return 0;
}