BR password challenge (too easy, m8)

BR_password_challenge.c

#include <stdio.h>
 
int main(void) {
	unsigned int length = 0;
	enum { empty = 0,
	       lower_alpha = 1,
	       upper_alpha = 2,
	       decim_digit = 4,
	       punctuation = 8    } criteria = empty;
 
	puts("Please enter a password and I'll judge its security...");
	for (;;) {
		int c = getchar();
		if (c < 0 || c == '\n') {
			break;
		}
 
		criteria |= lower_alpha * (islower(c) > 0);
		criteria |= upper_alpha * (isupper(c) > 0);
		criteria |= decim_digit * (isdigit(c) > 0);
		criteria |= punctuation * (ispunct(c) > 0);
		length = length == 8
		       ? length
		       : length + 1;
	}
 
#	define PREFIX "Your password must contain at least "
	puts((criteria & lower_alpha) == 0 ? PREFIX "one lower alpha character"
	   : (criteria & upper_alpha) == 0 ? PREFIX "one upper alpha character"
	   : (criteria & decim_digit) == 0 ? PREFIX "one decimal digit character"
	   : (criteria & punctuation) == 0 ? PREFIX "one punctuation character"
	   : length < 8                    ? PREFIX "eight characters"
	                                   : "Your password seems secure to me!");
 
	return 0;
}