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

#define N_BITS 3

int main(int argc, char *argv[])
{
	unsigned int i, mask=0700;
	struct stat buff;
	static char *perm[] = {"---", "--x", "-w-", "-wx", "r--", "r-x", "rw-", "rwx"};

	if (argc > 1)
	{
		if((stat(argv[1], &buff) != -1))
		{
			printf("Permissions for %s ", argv[1]);
			for(i=3;i;--i)
			{
				printf("%3s", perm[(buff.st_mode & mask) >> (i-1)*N_BITS]);
				mask >>= N_BITS;
			}
			putchar('\n');
		}
		else 
		{
			perror(argv[1]);
			exit(1);
		}
	}
	else 
	{
		fprintf(stderr, "Usage: %s file_name\n", argv[0]);
	}
	return(0);
}