#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <dirent.h>
#include <sys/stat.h>
#include <string.h>

void dir(char *path);

int main(int argc, char *argv[])
{
	if(argc != 2)
		dir(".");	/* default: current dir. */
	else
		dir(argv[1]);
	return(0);
}

void dir(char *path)
{
	DIR *dhandle;
	struct dirent *drecord;
	struct stat sbuf;
	int x;

	dhandle = opendir(path);
	if(dhandle == NULL)
	{
		printf("Error opening directory '%s'\n",path);
		exit(1);
	}

	x = chdir(path);
	if( x != 0)
	{
		printf("Error changing to '%s'\n",path);
		exit(1);
	}

	printf("Directory of '%s':\n",path);
	while( (drecord = readdir(dhandle)) != NULL)
	{
		stat(drecord->d_name,&sbuf);
		if(S_ISDIR(sbuf.st_mode))
		{
			if( strcmp(drecord->d_name,".") == 0 ||
			    strcmp(drecord->d_name,"..") == 0 )
					continue;
			putchar('\n');
			dir(drecord->d_name);
		}
		else
		{
			printf("%-16s",drecord->d_name);
		}
	}
	putchar('\n');
	chdir("..");
	closedir(dhandle);
}