My Unix ls command clone attempt

ls-clone-attempt.c

#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <time.h>
#include <string.h>

char filetype(struct stat *fs);

int main(int argc, char *argv[]){
	DIR *dirp;
	struct dirent *sd;
	struct stat fs;
	char real_path[PATH_MAX + 1];

	if((dirp = opendir(argv[1])) == NULL){
		perror("opendir");
		exit(1);
	}

	errno = 0;
	while((sd = readdir(dirp)) != NULL){

		/* resolving absolute path */
		strcpy(real_path, "");
		if(strcmp(argv[1], ".") != 0){
			strcat(real_path, argv[1]);
			strcat(real_path, sd->d_name);
		}
		else{
			strcpy(real_path, sd->d_name);
		}

		if(stat(real_path, &fs) == -1){
			perror("stat");
			exit(3);
		}
		
		/* print filetype and permission */
		printf("%c%c%c%c%c%c%c%c%c%c\t", filetype(&fs),
			(fs.st_mode & S_IRUSR) ? 'r' : '-',
			(fs.st_mode & S_IWUSR) ? 'w' : '-',
			(fs.st_mode & S_IXUSR) ? 'x' : '-',
			(fs.st_mode & S_IRGRP) ? 'r' : '-',
			(fs.st_mode & S_IWGRP) ? 'w' : '-',
			(fs.st_mode & S_IXGRP) ? 'x' : '-',
			(fs.st_mode & S_IROTH) ? 'r' : '-',
			(fs.st_mode & S_IWOTH) ? 'w' : '-',
			(fs.st_mode & S_IXOTH) ? 'x' : '-'
		);

		/* print UID & GID */
		printf("%d\t%d\t", (fs.st_mode & S_ISUID), (fs.st_mode & S_ISGID));

		/* print size */
		printf("%ld\t", (long)fs.st_size);

		/* print last modification time */
		printf("%.24s\t", ctime(&fs.st_mtim.tv_sec));
		printf("%s\n", sd->d_name);
	}

	if(sd == NULL && errno){
		perror("readdir");
		exit(2);
	}

	return 0;
}

char filetype(struct stat *fs){
	char ch;

	switch(fs->st_mode & S_IFMT){
		case S_IFSOCK:
			ch = 's';	
			break;
		
		case S_IFLNK:
			ch = 'l';
			break;

		case S_IFIFO:
			ch = 'p';
			break;

		case S_IFREG:
			ch = '-';
			break;

		case S_IFBLK:
			ch = 'b';
			break;

		case S_IFDIR:
			ch = 'd';
			break;

		case S_IFCHR:
			ch = 'c';
			break;

		default:
			ch = '?';
	}

	return ch;
}