#include <stdio.h>
#include <stdlib.h>    /* calloc() */
#include <string.h>    /* strlen(), strncpy() */
#include <sys/types.h> /* opendir() */
#include <dirent.h>    /* opendir() */

int printdir(char *path, char *prefix)
{
	DIR *dp = opendir(path);
	if(dp != NULL) {
		struct dirent *file;
		while(file = readdir(dp)) {
			/* exclude current and parent entries */
			if(strcmp(file->d_name,".") != 0
					&& strcmp(file->d_name,"..") != 0) {
				if(file->d_type != DT_DIR) {
					printf("%s%s\n", prefix, file->d_name);
				} else {
					char *newpath = NULL;
					char *newprefix = NULL;
					asprintf(&newpath, "%s%s/", path, file->d_name);
					asprintf(&newprefix, "%s%s/", prefix, file->d_name);
					printf("%s\n", newprefix);
					printdir(newpath, newprefix);
					free(newpath);
					free(newprefix);
				}
			}
		}
		closedir(dp);
		return 0;
	} else {
		return 1;
	}
}

int main(int argc, char *argv[])
{
	char *path;
	/* open the dir specified on the command line- first
	 * ensure we have a trailing slash */
	if(argv[1]) {
    	int len = strlen(argv[1]);
    	if(argv[1][len-1] != '/') {
      		len += 1;
	    }
    	path = calloc(len + 1, sizeof(char));
	    strncpy(path, argv[1], len);
	    path[len-1] = '/';
		printdir(path, "");
		free(path);
		return 0;
	}
	return 1;
}