int	ibuf1[259];
int	ibuf2[259];
int	eflg;
int	lflg	1;
int	oflg;
int	wflg;
int	line[2]	{0, 1};
int	chr[2] { -1, -1};

main(argc, argv)
char **argv;
{
	register c1, c2;
	int oc1, oc2, prevdiff;
	char *arg, *loc;

	if(argc < 3)
		goto narg;

	arg = argv[1];
	while (arg[0] == '-') {
		if (arg[1] == 's')
			lflg--;
		if (arg[1] == 'l')
			lflg++;
		if (arg[1] == 'o')
			oflg++;
		if (arg[1] == 'w')
			wflg++;

		argv++;
		argc--;
		arg = argv[1];		
		}

	if(argc < 3)
		goto narg;

	if( arg[0]=='-' && arg[1]==0 )
		ibuf1[0] = dup(0);
	else if(fopen(arg, ibuf1) < 0)
		goto barg;

	arg = argv[2];
	if(fopen(arg, ibuf2) < 0)
		goto barg;

loop:
	if (++chr[1]==0)
		chr[0]++;

	if ((chr[1] & 1) == 1) {
		oc1 = c1;
		oc2 = c2;
		}
	  else
		prevdiff = 0;		/* Note: cleared on 0th byte */

	c1 = getc(ibuf1);
	c2 = getc(ibuf2);
	if ((c1 == c2) && (prevdiff == 0)) {
		if (c1 == '\n')
			if (++line[1]==0)
				line[0]++;
		if(c1 == -1) {
			if(eflg)
				exit(1);
			exit(0);
		}
		goto loop;
	}

	if(lflg == 0)
		exit(1);
	if(c1 == -1) {
		arg = argv[1];
		goto earg;
	}
	if(c2 == -1)
		goto earg;

	if(lflg == 1) {
		printf("%s %s differ: char %s, line ", argv[1], arg,
			locv(chr[0], chr[1]));
		printf("%s\n", locv(line[0], line[1]));
		exit(1);
	}

	eflg = 1;
	if (oflg)
		loc = loocv(chr[0], (chr[1] - (wflg ? 1 : 0)));
	  else
		loc = locv(chr[0], (chr[1] -  (wflg ? 1 : 0)));

	if (wflg == 0) {
		printf("%10s %3o %3o\n", loc, c1, c2);
		goto loop;
		}

	if ((chr[1] & 1) == 0) {
		prevdiff++;
		goto loop;
		}
		
	printf("%10s %6o %6o\n", loc, ((c1 << 8) | oc1), ((c2 << 8) | oc2));
	goto loop;

narg:
	printf("cmp [-s] [-l] [-o] [-w] {file1} {file2}\n");
	exit(2);

barg:
	printf("cannot open %s\n", arg);
	exit(2);

earg:
	printf("EOF on %s\n", arg);
	exit(1);
}

putchar(c)
{

	write(1, &c, 1);
}